CN103929232A - Broadband mobile communication method and system based on multi-beam GEO satellite - Google Patents

Broadband mobile communication method and system based on multi-beam GEO satellite Download PDF

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CN103929232A
CN103929232A CN201410168372.5A CN201410168372A CN103929232A CN 103929232 A CN103929232 A CN 103929232A CN 201410168372 A CN201410168372 A CN 201410168372A CN 103929232 A CN103929232 A CN 103929232A
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signal
individual
link
module
data
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CN103929232B (en
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易克初
李怡
田斌
田红心
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Xidian University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/19—Earth-synchronous stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/204—Multiple access
    • H04B7/2041—Spot beam multiple access

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a broadband mobile communication method based on a multi-beam GEO satellite. The broadband mobile communication method based on the multi-beam GEO satellite mainly comprises the steps that spot beams at the Ka frequency band are adopted by NG+1 bidirectional feed links between a satellite-borne device and a ground station device, so that space division multiplexing is achieved for NG+1 times; a cellular network with NB cells is formed through NB bidirectional user links between the satellite-borne device and NT mobile user terminals based on an NB-beam satellite antenna, and space division multiplexing is achieved for NB/4 times with every four cells as a group, so that a 260 MHz bandwidth resource can be shared. The invention further discloses a broadband mobile communication system based on the multi-beam GEO satellite. According to the broadband mobile communication method and system based on the multi-beam GEO satellite, any one of the NT mobile user terminals can serve as an independent multimedia communication terminal as well as a local area network connected with a public Internet and can have access to a remote URL through the satellite links of the system, and an Internet service on the level similar to the 4G mobile communication level can be provided for a large number of people on various vehicles.

Description

Wide-band mobile communication method and system based on multi-beam GEO satellite
Technical field
The invention belongs to communication technical field, be specifically related to a kind of wide-band mobile communication method and system based on multi-beam GEO satellite.
Background technology
Based on GEO (geostationary orbit, the english abbreviation of Geostationary Orbit) or LEO (Low Earth Orbit, the english abbreviation of Low Earth Orbit) the broadband cellular network mobile communication system of satellite, there are two unique advantages that terrestrial network is incomparable: its wide area seamless coverage ability of the first, can support the internet, applications in the vehicles such as steamer, train, long-distance bus, aircraft; It two is that its route single-hop just can be crossed over several thousand kilometers, and this quality assurance for real-time multimedia traffic in internet, applications is highly beneficial; Therefore, various satellite honeycomb net mobile communicating systems are still among flourish.
Yet LEO Broadband Satellite Cellular Networks needs huge fund of disposable input, so that much planning all gives up halfway, or only rest on the empty talk stage.The existing very large progress of construction of the broadband cellular network based on GEO satellite, and obtained good application.For example: the SPACEWAY system of the U.S. (referring to R J F.Fang, Broadband IP Transmission over satellite with On-Board Processing and Switching//IEEE Global Telecommunications Conference (GLOBECOM2011), 2011:1-5), WINDS (the Wideband Internetworking Engineering Test and Demonstration Satellite) system of Japan is (referring to R.Kuramasu, T.Araki, M.Shimada, T.Satoh, and et.al., Wideband InterNetworking Engineering Test and Demonstration Satellite (WINDS) System, Technical Report of IEICE, no.SAT2002-60, Oct.2002, pp.31-42).But the terrestrial user station number that SPACEWAY and WINDS system can be supported is all less, on its star, exchange belongs to main line exchange in essence, can not support great quantity of small user terminal, is more not easy to support mobile communication, and for example: the Inmarsat-4 of International Maritime Satellite Organization is (referring to Inmarsat Broadband Global Area Network (BGAN) System Description Manual, Revision2.1.0, Feb.2003), can support small-sized movable user terminal, but can support that user's total capacity of wide-band mobile communication is still very limited, and not solve well by the problem entering the Internet, Thailand's IPSTAR system is (referring to W.Thesling, M.Vanderaar, M.Thompson, et al., Two-way Internet over iPSTAR using advanced error correction and dynamic links//AIAA Int.Conf.on Comm.Satellite System, Montreal, Canada.2002), adopt the transparent forwarding system of bent-tube boiler, on satellite without any exchange and routing device, this makes its message capacity (45Gbps) and user capacity (on subscriber channel number 100,000) all unprecedentedly huge, but because its all exchange and route all complete by ground juncture station, this makes it too rely on ground network, and be unfavorable for guaranteeing the quality of real-time broadband multimedia service, in addition also has WGS (the Wide Broadband Global Satellite System) system (referring to WGS System Specification, rev.C, 4/30/2003) of the U.S., the XX-2 military satellite communication system of China etc.
Multibeam satellite antenna technology is for supporting wide-band mobile communication to open up road based on GEO satellite, and GEO satellite just can be supported more than 10Gbps message capacity, support thousands of mobile subscribers to carry out broadband connections.Yet the wide-band mobile communication system of development based on GEO satellite mainly contains two key issues: the one, how to realize on the star of large user's capacity very that signal is processed and star on exchange; The 2nd, how to support the problem of internet service.If carry out shunt, demodulation, decoding for very many user uplink signals on star, to issuing all users' information, encode, modulate He He road simultaneously, its equipment complexity and power consumption are all that satellite is unaffordable, therefore generally all adopt on non-regenerative star and process and on star, exchange accordingly, but this is again for supporting that internet service has caused obstacle.
WGS (the Wideband Gap-filling Satellite that the U.S. builds for 2005, changed afterwards Wideband Global SATCOM into), on star, adopt non-regenerative signal processing technology (the shunt He He road of the FDMA based on FFT) in conjunction with programme-controlled exchange, on star, only carry out along separate routes, close road and exchange, avoided above-mentioned first difficult problem and obtained very ten-strike; WGS has become the main means of communication that U.S. army realizes global communication, certainly in principle, also extends to civilian.On this star, non-regenerative is processed and programme control circut switching system, solve multi-beam satellite and supported the problem that a large number of users information exchanges on star, to ground central station, carrying out through satellite link, being forwarded to each user again after signal processing exchanges with user with transparent forwarding compares, the double jump of communicating by letter between user terminal is become to single-hop, not only can save the channel resource of half, and can shorten the propagation delay time of a times, this is for supporting that broadband real-time video traffic is a very rare large advantage.
But programme control circut exchange can not realize IP route switching on star on star, this is for supporting internet should be used for saying to be a serious obstacle.In order to address this problem, WGS adopts DVB-S2/RCS (Digital Video Bcasting-S2/Return Channel via Satellite) international standard protocol recently, form a kind of MF-TDMA system that is similar to the support of conventional satellite Transparent Transponder (referring to Gibbons, et all, Link Analysis of Commercial and Wideband Gapfiller Satellite (WGS) Systems Using DVB-S2 with variable Coding and Modulation (VCM), Milcon.2006paper266), subscriber signal carries out shunt by satellite transparent forwarding to ground central station, demodulation, decoding and IP exchange, and then link is forwarded to each user via satellite.Obviously, this system configuration can only partly solve the problem of supporting internet service, that is to say to have sub-fraction frequency band to adopt this system, and most of frequency band still remains original programme-controlled exchange and supports single-hop transmission.This is that on star, programme-controlled exchange has just lost meaning because if whole satellite all adopts this system.
In addition, it is worth mentioning that Direct-PC that Hughes Electronics releases at the end of the nineties in last century is (referring to satellite internet technology, China Telecom website), it utilizes conventional GEO satellite Ku wave band Transparent Transponder with IP-OVER-DVB-S mode broadcast transmission multimedia service information, user terminal need only adopt reception antenna and a price and cheap Set Top Box or the PC card thereof of 40cm bore, just can directly receive the multimedia messages up to 40Mbps from the information rate of central station, and directly enter PC; PC user terminal can also return by terrestrial interconnection net, realizes internet access.This system has obtained application extremely widely very soon because user terminal cost is very low.2003, the Action Plan for Invigorating Education that China starts also adopted this system to set up China Education and Research Network, develops into very soon a hundreds of thousands user.(referring to Li Wei, < < utilizes VSAT technology, service long-distance education field > >, China Satecom's application conference, 2006.9).On this system principle, can support broadband internet application, but owing in fact returning route still by the outer interactive mode of ground network, make a large number of users back information pour in network center and be very easy to cause congested, thereby cannot really realize two-way Internet service, it mainly still serves the incoming only station of TV or multimedia broadcasting thus.Hughes Electronics had improved this system afterwards, changing terrestrial network passback into via satellite link passback (translates referring to Li Junping, Wang Qi, < < reviews and prospects: the > > in 2011 in external communication satellite industry senior executive eye, satellite and network, 2012.3), make user terminal cost significantly increase, seriously limited its extensive use.Meanwhile, because this satellite communication system is not in conjunction with multibeam satellite antenna technology, its frequency resource, user capacity are all very limited, cannot bring into play the competitive advantage of satellite communication at all.
Making a general survey of the present situation of wideband satellite communication development can find out, the occasion that important function has really been brought into play in satellite communication is mainly military communication, emergency communication and maritime communication aspect, and it is still having larger potentiality not bring into play aspect civilian mobile communication, that is exactly in the broadband the Internet applications of supporting to comprise on the vehicles such as train, long-distance bus, aircraft, steamer and Emergency communication vehicle real-time multimedia traffic, it should have unique advantage, but do not obtain so far fine performance, and there is larger market and social demand in this respect.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned deficiency of the prior art, provide a kind of method step simple, realize convenient and the good wide-band mobile communication method based on multi-beam GEO satellite of result of use.This wide-band mobile communication method can provide internet service for a large amount of personnel on the multiple vehicles and Emergency communication vehicle.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of wide-band mobile communication method based on multi-beam GEO satellite, is characterized in that: between the on-board equipment on GEO satellite and earth station equipment, pass through (N g+ 1) bar is two-way is fed to link bidirectional communication, and on-board equipment and N tbetween individual mobile subscriber terminal, pass through N bbar Double-Direction User link carries out two-way communication; N g, N tand N bbe positive integer, N g>=2, N b=69～200; Described earth station equipment comprises the Yi Ge network control center and N gindividual juncture station; The described two-way link that is fed to comprises line feed link and lower line feed link, (N g+ 1) described in bar, the two-way link that is fed to all adopts Ka frequency range spot beam to carry out transfer of data, and realizes (N g+ 1) inferior space division multiplexing; Described Double-Direction User link comprises user uplink link and user's down link, N bdescribed in bar, Double-Direction User link all adopts user link wave beam to carry out transfer of data, described user link wave beam be X band beam, Ku band beam or or Ka band beam;
Described on-board equipment and N tindividual described mobile subscriber terminal adopts the cellular network being formed by satellite antenna wave beam to carry out bidirectional data transfers, the bandwidth of frequency band that described cellular network adopts is that 260MHz and this frequency band division are the sub-band of 4 65MHz bandwidth, and the frequency of 4 described sub-bands is all not identical; Described cellular network is divided into N altogether bindividual cellular cell, described in each, cellular cell is all corresponding to N ba Double-Direction User link described in bar in Double-Direction User link, every 4 adjacent cellular cells form Yi Ge community family, N bindividual described cellular cell belongs to N b/ 4 community families, all comprise 4 described cellular cells in the family of community described in each, and described in each, 4 described cellular cells in the family of community adopt respectively 4 described sub-bands to carry out transfer of data, thereby make the frequency resource of 260MHz bandwidth realize N b/ 4 space division multiplexings; N beach user uplink link in individual described user's two-way link is the subband signal of 26 the 2.5MHz bandwidth of transmission by a 65MHz bandwidth all, described subband signal is the signal that mobile subscriber terminal need be sent to on-board equipment, the channel of 65MHz bandwidth is divided into 26 sub-band channel of transmitting for 26 described subband signals respectively, and described in each, user uplink link all comprises 26 described sub-band channel; Each sub-band channel is with T fin the frame period of millisecond, every frame is divided into N sindividual time slot carries out communication, wherein T f=5～20, N s=8～16; N bevery user's down link in individual described user's two-way link is respectively by the channel transmission data of a 65MHz bandwidth; N tindividual described mobile subscriber terminal shares N bdescribed in bar, Double-Direction User link carries out transfer of data, N t=(N s-1) * 26 * N b;
The data transmission procedure of described user uplink link is as follows:
Step 101, signal are uploaded: (the N in each cellular cell s-1) * 26 mobile subscriber terminals with MF-TDMA mode transmitted signal, are sent to on-board equipment by described user uplink link; Mobile subscriber terminal transmitted signal is the signal of IP traffic;
Signal tap and processing on step 102, star: described on-board equipment in MF-TDMA mode to every (N that user uplink link is transmitted in step 101 s-1) * 26 subscriber signals carry out frequency division tap and time-division tap processing; In every frame except the signal of the 1st time slot, all the other (N s-1) signal of individual time slot is all sent into programme-controlled exchange module and is carried out programme-controlled exchange;
In every frame, the signal of the 1st time slot accesses with Synchronous-Code Division Multiple Access, and is in harmonious proportion after decoding through despreading, solution, sends into ip router and carries out IP exchange;
The data transmission procedure of described user's down link is as follows:
Data transaction and modulation on step 201, star: the IP traffic that the need of ip router output is sent to mobile subscriber terminal is changed the data flow that forms IP-over-DVB-S form, then carries out Digital Modulation;
Step 202, signal pass down: Digital Modulation gained signal in step 201 is sent to corresponding mobile subscriber terminal by described user's down link; The bandwidth of the corresponding described user's down link in each cellular cell is 65MHz;
The data transmission procedure of described upper line feed link is as follows:
Step 301, signal are uploaded: by described upper line feed link, the information that the network control center or juncture station are sent is sent to on-board equipment with IP-over-SDH form; The total bandwidth of every described upper line feed link is W umHz, W u=65 * N b/ [(N g+ 1) η], the ratio of the band efficiency of the ηWei network control center or juncture station digital modulation mode used and the band efficiency of user's down link digital modulation mode used wherein;
On step 302, star, signal receives and processes: described on-board equipment receives after the signal that the step 301Zhong network control center or juncture station transmit, and first carries out demodulation and decoding, then sends into ip router and carry out IP exchange;
The data transmission procedure of described lower line feed link is as follows:
The multiple connection of multiple signals and modulation on step 401, star: the base band complex envelope signal that the need of programme-controlled exchange module output is sent to a plurality of users of earth station equipment, and the need of ip router output are sent to the IP traffic of earth station equipment through the base band complex envelope signal of Digital Modulation gained, carry out after MF-QOTDM multiple connection, then carry out multi-carrier modulation; Every described lower line feed link is modulated to N b/ (N g+ 1) the QOTDM signal of individual carrier modulation, each QOTDM signal forms by the base band complex envelope signal multiplexing of 26 2.5MHz bandwidth, and the bandwidth of each QOTDM signal is 65MHz, wherein in each base band complex envelope signal, contains (N s-1) individual MF-TDMA signal;
Wherein, MF-QOTDM is multiband QOTDM, and MF-QOTDM transmission method is multiband QOTDM transmission method, disclosed quasi OTDM transmitting method in the application for a patent for invention that described QOTDM transmission method is notification number CN1845487B; While carrying out MF-QOTDM multiple connection, the multiple connection method adopting is multiple connection method used in described QOTDM transmission method;
Under step 402, signal, pass and reception & disposal: by described lower line feed link, multiple connection in step 401 and modulation gained signal are sent to the corresponding network control center or juncture station; Then, carry out multicarrier solution mediation QOTDM tap and process in the network control center or juncture station, every described lower line feed link carries out N b/ (N g+ 1) individual carrier wave demodulation, each carrier wave demodulation result is carried out QOTDM tap again, respectively obtains 26 base band complex envelope signals; Each base band complex envelope signal carries out time-division tap again, respectively obtains 8 complex baseband signals; Again gained complex baseband signal is carried out respectively to demodulation coding.
The above-mentioned wide-band mobile communication method based on multi-beam GEO satellite, is characterized in that: N tit is synchronous that the time synchronized deviate that individual described mobile subscriber terminal all detects according to on-board equipment is carried out closed loop, and described in each user uplink link by the synchronous transmission of the synchronous achieve frame of closed loop and time slot, carry out closed loop when synchronous, described on-board equipment detects each mobile subscriber terminal and at the synchronous head of each frequency band and each time slot signal transmitted, arrives the time synchronized deviate of on-board equipment, and after being modulated to digital modulation signals, this time synchronized deviate is sent to corresponding mobile subscriber terminal by described user's down link, this mobile subscriber terminal receives after described digital modulation signals, according to the synchronism deviation value size receiving, adjust its transmission delay, the synchronism deviation of the synchronous head arrival on-board equipment of next transmitted signal is reduced, thereby it is synchronous to realize closed loop.
The above-mentioned wide-band mobile communication method based on multi-beam GEO satellite, it is characterized in that: before the signal that the need that by described upper line feed link, the network control center or juncture station sent in step 301 are uploaded to GEO satellite is sent to on-board equipment, the division of signal that first need is uploaded to GEO satellite is N sgroup; Every group of signal is all adapted for the link signal form of SDH host-host protocol, then carries out chnnel coding and become the bit stream of 320Mbps with 1/2 code check, is modulated into the signal that bandwidth is 200MHz afterwards through QPSK; When the signal that need is uploaded to GEO satellite by described upper line feed link is sent to on-board equipment, N sthe signal of individual 200MHz bandwidth carries out uplink in the channel of Ka frequency range spot beam in frequency division multiplexing mode; Described in step 302, on-board equipment receives N safter the signal of individual 200MHz bandwidth, first received signal is carried out along separate routes, separates mediation decoding, then send into ip router and carry out IP exchange.
The above-mentioned wide-band mobile communication method based on multi-beam GEO satellite, it is characterized in that: while carrying out transfer of data by described lower line feed link in step 402, adopt MF-QOTDM transmission method to carry out transfer of data, synchronizing sequence adopts pseudo noise code and its to double as spreading code and uses, and this spreading code is for being sent to the need of ip router output the IP data spread spectrum of earth station equipment and being transferred to the corresponding network control center or juncture station.
The above-mentioned wide-band mobile communication method based on multi-beam GEO satellite, it is characterized in that: when in step 102, in every frame, the signal of the 1st time slot accesses with Synchronous-Code Division Multiple Access, adopt the channel competition mechanism of carrier sense, with Synchronous-Code Division Multiple Access, send scattered IP packet, comprise signaling information and HTTP service note breath; Again the signal of described scattered IP packet is carried out despreading, separated after mediation decoding, send into ip router and carry out IP exchange, after IP exchange, deliver to respectively OAMAgent module on corresponding user's down link, lower line feed link or star.
The above-mentioned wide-band mobile communication method based on multi-beam GEO satellite, is characterized in that: in step 102 on-board equipment in MF-TDMA mode to every (N that user uplink link is transmitted in step 101 s-1) * 26 subscriber signals carry out frequency division tap and time-division tap while processing, first by quadrature frequency conversion module, received signal is carried out to quadrature frequency conversion and be converted to complex baseband signal, by frequency division Demultiplexing module, carry out frequency division tap again, by time-division Demultiplexing module, carry out time-division tap again, then send into programme-controlled exchange module and exchange; While carrying out the data multiplexing of multiple signals on star in step 401, adopt MF-QOTDM multiple connection module to carry out multiple connection; The N of the module of programme-controlled exchange described in step 102 bindividual input port respectively with the joining for exporting the data output interface of base band complex envelope signal sampling point sequence of time-division the Demultiplexing module, (N of programme-controlled exchange module g+ 1) individual output port respectively with (N g+ 1) Data Input Interface of individual MF-QOTDM multiple connection module joins; The granularity of described programme-controlled exchange module exchange is the sampling point sequence data of a time slot in a bandwidth described base band complex envelope signal that is 2.5MHz; When programme-controlled exchange module is carried out programme-controlled exchange, according to the switching and routing table of being set up by described signaling information, by N bthe sampling point sequence data that individual input port is sent into is transferred to respectively corresponding output port; The update cycle of described switching and routing table is (N f* T f) millisecond, wherein N ffor positive integer and N f=1～20.
The above-mentioned wide-band mobile communication method based on multi-beam GEO satellite, it is characterized in that: while carrying out frequency division tap in step 102, the frequency division Demultiplexing module of employing based on 32 FFT is 26 base band complex envelope signals by received signal tap, with time-division Demultiplexing module, each the base band complex envelope signal in resulting 26 base band complex envelope signals is carried out respectively to time-division tap again, after each base band complex envelope signal time-division tap, all obtain the signal of 8 time slots, realized the time-division tap of MF-TDMA mode.
The above-mentioned wide-band mobile communication method based on multi-beam GEO satellite, it is characterized in that: the information content that transmits signal by described lower line feed link in step 402 is IP packet, the described network control center or juncture station receive after the signal transmitting by described lower line feed link, first carry out shunt, separate mediation decoding, then the IP packet that wherein belongs to local internet is sent into local router and carry out IP exchange; And need be sent to by on-board equipment the IP packet of mobile subscriber terminal, first by described upper line feed link, be sent to on-board equipment, then be sent to corresponding mobile subscriber terminal by described user's down link.
Meanwhile, the invention also discloses a kind of wide-band mobile communication system based on multi-beam GEO satellite, it is characterized in that: comprise the on-board equipment being laid on GEO satellite, the earth station equipment and the N that are laid in ground and carry out two-way communication with on-board equipment tindividual N tthe individual mobile subscriber terminal that carries out two-way communication by the relay transmission effect of on-board equipment, described earth station equipment comprises the Yi Ge network control center and N gindividual juncture station, N gfor positive integer and N g>=2;
Described on-board equipment comprises ip router, programme-controlled exchange module, N bindividual data conversion module, can produce N bthe first multi-beam dual-mode antenna of individual described user link wave beam, can produce (N g+ 1) the second multi-beam dual-mode antenna of individual described Ka frequency range spot beam, the first signal Transmit-Receive Unit joining with the first multi-beam dual-mode antenna and the secondary signal Transmit-Receive Unit joining with the second multi-beam dual-mode antenna, the N that described secondary signal Transmit-Receive Unit receives bindividual signal is sent into programme-controlled exchange module respectively after quadrature frequency conversion module, frequency division Demultiplexing module and time-division Demultiplexing module; The quantity of described quadrature frequency conversion module, frequency division Demultiplexing module and time-division Demultiplexing module is N bindividual, N bindividual described time-division Demultiplexing module for the data output interface of exporting base band complex envelope signal sampling point sequence respectively with the N of programme-controlled exchange module bindividual input port joins; (the N of described programme-controlled exchange module g+ 1) individual output port respectively with (N g+ 1) input interface of individual MF-QOTDM multiple connection module joins, (N g+ 1) output port of individual MF-QOTDM multiple connection module respectively with (N g+ 1) individual described secondary signal Transmit-Receive Unit joins;
N bindividual described time-division Demultiplexing module for exporting the data-out port of the 1st time slot signal, all join with the data-in port of SCDMA access module; On the signaling information output port of SCDMA access module and star, the signaling information input port of OAMAgent module joins, and on described star, OAMAgent module and programme-controlled exchange module are joined;
IP packet output port and the ip router of described SCDMA access module join, and on described star, IP data input/output interface and the ip router of OAMAgent module joins; (N g+ 1) the IP data-in port of individual described MF-QOTDM multiple connection module all joins with ip router, N bthe IP data-in port of individual described data conversion module all joins with ip router, N bthe output port of individual described data conversion module respectively with N bindividual the first modulation module joins, N bindividual described the first modulation module all joins with first signal Transmit-Receive Unit;
IP data output interface and the ip router of described secondary signal Transmit-Receive Unit join; (N g+ 1) output port of individual described MF-QOTDM multiple connection module respectively with (N g+ 1) individual the second modulation module joins, (N g+ 1) individual described the second modulation module all joins with secondary signal Transmit-Receive Unit.
The above-mentioned wide-band mobile communication system based on multi-beam GEO satellite, is characterized in that: OAMAgent module, N on the described network control center, star gnetwork management information interface unit and the N of individual described juncture station tthe webmaster performance element of individual described mobile subscriber terminal forms network management control system, and described network management control system forms a star IP network, and the Centroid of described star IP network is the network control center, OAMAgent module, N on described star gdescribed network management information interface unit and the N of individual described juncture station tthe described webmaster performance element of individual described mobile subscriber terminal is the terminal node of described star IP network.
The present invention compared with prior art has the following advantages:
1, the wide-band mobile communication system that adopts simple in structure, reasonable in design and result of use is good, its on-board equipment comprise 69～200 X frequency ranges, Ku frequency range or or the dual-mode antenna of Ka frequency range Cellular Networks wave beam and relevant transceiver, the dual-mode antenna of 5～17 Ka frequency range spot beams and the star of relevant transceiver, a programme-controlled exchange module, an ip router and a network management system on OAMAgent module; Earth station equipment includes one for central station and 4～16Ge juncture station of network control management, can support tens thousand of broadband mobile user terminals (the satellite link interface termination that comprises Internet local area network (LAN)) to communicate simultaneously; Mobile subscriber adopts MF-TDMA and SCDMA mode to send with the speed of 0.4～28Mbps, adopt IP-over-DVB-S data stream format to receive with the speed of 155Mbps, can be used for supporting the occasions such as aircraft, train, steamer, Emergency communication vehicle to comprise that multimedia service is in interior internet, applications.
2, adopt that wide-band mobile communication method step is simple, reasonable in design and transmitting procedure is reliable, laser propagation effect is good.
3, the overall planning of wide-band mobile communication system is reasonable, and limited frequency resource and GEO Satellite Payloads resource are fully used, and is suitable for forming the wide-band mobile communication system that user capacity is large as far as possible.As far as possible IP route switching on the processing of non-regenerative signal and programme-controlled exchange, simple star on many multibeam satellite antenna, star of numbers of beams, reasonably access mode (MF-TDMA+SCDMA), the efficiently two-way IP exchange that is fed to link, ground juncture station and the broadband wireless core backbone network administrative center planning of overall plan such as closely cooperate, make system can utilize fully, efficiently frequency resource and the GEO Satellite Payloads resource in X frequency range, Ku frequency range or Ka frequency range, capacity and data throughput as far as possible extend one's service.For example: when user wave beam number is 140,260MHz bandwidth frequency resource can space division multiplexing 35 times, reaches 9.1GHz; The frequency band division of each wave beam 65MHz is the subband of 26 2.5MHz, and 140 wave beams amount to sub-band channel number and can reach 3640; Each subband is realized the time division multiplexing (wherein the 1st time slot is mainly used in command transmitting) of 8 time slots, and the total number of users maximum that can simultaneously communicate can reach 7 * 26 * 140=25,480.Can adopt a NCC and 8 juncture stations, amount to 9 Ka band dual and support whole system to being fed to link.
For a system of this scale, on star, need the frequency division Demultiplexing module of 32 FFT of 140 80MHz work clocks, adopt FPGA to realize these frequency division Demultiplexing module resource requirements, compare approximate identical with the sub-band channel that amounts to 1872 2.6MHz in WGS; This is because the latter needs 64 FFT frequency division Demultiplexing modules of 39 160MHz work clocks, and its signal reconstruction part also needs the resource onesize with frequency division Demultiplexing module part; And native system needn't carry out FDMA signal reconstruction, only need carry out the QOTDM multiple connection of 140 26 signals, and the MF-QOTDM multiple connection of 9 descending feed signals, the required FPGA resource of such signal multiplexing can reduce 3～5 times than FDMA signal reconstruction.
Another satellite resource consumes the signal transmission that ratio the best part is user's down link, and WGS adopts FDM mode transmitted signal, and the flat power ratio in its peak is very high.Because multi beamforming radio-frequency antenna coupler can not be too complicated, be difficult to adopt the synthetic way of spatial power to increase the linear dynamic range of each power tube output signal, the power tube of each 125MHz frequency band will send 48 subband signals, the flat power ratio in its peak is 48, for reducing the non-linear multicarrier intermodulation causing, disturb, have to carry out significantly back-off, this just causes three serious problems that volume and weight is very large, average transmit power is very little, radio-frequency power efficiency is very low of power tube.In the present invention, user's down link adopts IP-OVER-DVB-S form to send multiple user signals, belong to single-carrier modulated signal, power tube needs to carry out back-off hardly, and it is the highest that power efficiency can reach, and no longer has power tube volume weight too greatly and the too little problem of average power.In a word, although the wave beam number of this programme increases to 140, and the reduced several times of the satellite resource consumption rate WGS of its user's down link.
The complexity of programme control circut switching part and resource consumption are all far smaller than aforementioned two parts, and this is because its buffer memory capacity requires and be little, and congestion control mechanism is very simple, complicated unlike ATM exchange; Although this programme has adopted two programme-controlled exchange modules, complexity and resource consumption that it is total slightly increase than WGS, and the resource consumption of this part still only accounts for the very small scale of total resource consumption.
In a word, the large capacity wide-band mobile communication system of as above enumerating, its user capacity has increased several times than WGS system, particularly supports the number of mobile users of internet, applications can increase manyfold.This be because except sub-band channel number by 1876 increase to 3640 and the every frame of MF-TDMA be divided into 8 time slots, SCDMA makes again the number of users of the 1st time slot of each subband increase 8 times, therefore the maximum comparable WGS of open ended total number of users increase more than 16 times.Although it is so many that its user capacity increases, known according to the estimation of above-mentioned complexity and resource consumption, it still can adopt the GEO satellite platform similar to WGS to realize.Notice that WGS only has 27 X-band wave beams for supporting mobile communication.
4, reasonably multi-access mode is particularly suitable for supporting the random accessing Internet of a large number of users, can make the data throughput of whole network high as much as possible.
The feature of internet, applications is that each user sends the characteristic that IP bag has randomness and information rate dynamic change.If as WGS, only adopt MF-TDMA to realize by reservation and distribute time slot, may cause each time slot often to occur the free time and utilize inadequate phenomenon.This programme adopts SCDMA mode, has the characteristic of soft capacity and statistic multiplexing, in the juncture station of ground, in conjunction with multiuser detection, can reach higher data throughput and user capacity.MF-TDMA and two kinds of multi-access modes of SCDMA are combined, make the dynamic range of the adjustable information rate of each user can be larger.Meanwhile, also can send randomly scattered IP by the signalling time slot and wrap, demodulation coding and simple IP exchange on star, the operational efficiency of raising internet.
5, on star, adopt rational non-regenerative signal to process and programme control circut exchange, can guarantee that system can guarantee, under the prerequisite of quality of service, significantly to promote the providing capability of real-time multimedia traffic.
With WGS system class seemingly, on culminant star of the present invention, also adopt non-regenerative signal to process and programme control circut exchanges.With based on processing on regenerative star, compare, not only can significantly reduce complexity and the power consumption of on-board equipment, and make each channel all there is very strong application flexibility, this advantage is similar with WGS.But, as seen from the following analysis, there is larger advantage aspect the quality of native system real-time multimedia traffic in guaranteeing internet application.
As everyone knows, the internet, ground based on Optical Fiber Transmission can provide high-quality video broadcasting and video conference business, but it is to rely on very large these two characteristics of the non-constant width of channel width and nodal cache device to guarantee this class quality of service.By contrast satellite network at this inferior position highly significant aspect two, only the quality of this business is guaranteed in reliable circuit switching by reservation fixed allocation channel; But the channel resource of satellite very little, be difficult to meet so many mobile subscriber's this demand.On this programme culminant star, there are a programme-controlled exchange module and an ip router, wherein, programme-controlled exchange module is recombinated user uplink link signal after shunt, through lower line feed link, send to the overhead nearer juncture station of Internet destination address, this juncture station sends it to this destination node again, with IPstar systematically bent-tube boiler satellite link transmission compare, like this transmission to greatly reduce through the nodes of internet, ground route, greatly reduce congested possibility, easily guarantee the quality of real-time multimedia traffic, simultaneously, while exchanging on star, there is multiple possible juncture station to select, therefore, on star, exchange always has available route and can not cause congested.In like manner, while accessing for mobile subscriber the real-time multimedia traffic that terrestrial network node provides at a distance, can select any one juncture station close to from source node, multimedia messages is delivered on star by line feed link on it, after ip router exchange on star, then send to this targeted customer by user's down link.So also can greatly reduce congestedly, easily guarantee the quality of real-time multimedia traffic.Consider that two real-time multimedia traffic probability of happening between mobile subscriber are less, so direct path is not provided on star, the ground juncture station indirect communication but it detours, quality of service can obviously not reduce yet, and just increases and is twice satellite link time delay.
In a word, this wide-band mobile communication system is that the two backups each other by satellite link and ground network route in itself, not only can be in real-time many matchmakers business providing capability of guaranteeing to increase substantially under the prerequisite of quality of service system, and make satellite channel resource obtain the most effectively utilizing.
6, user's down link adopts IP-over-DVB-S standard agreement, realization is transmitted based on time-multiplexed single-carrier modulated mode, there is the highest power efficiency, thereby can give full play to the usefulness of satellite RF power, the manufacturing cost of mobile subscriber terminal is significantly reduced, and can adopt the multi-system modulation as 16APSK to obtain very high channel efficiency and information rate, for example reach the net rate of 155.52Mbps.Below the detailed demonstration of above-mentioned conclusion:
As everyone knows, for the amplification of multi-band signal, there is multicarrier intermodulation interference phenomenon in radio-frequency power amplifier, thereby cause many-sided serious problems.First be to adopt the way of back-off to carry out the clipping distortion of Avoids or reduces signal.If frequency band number is N, each subband all sends onesize power, the peak power of resultant signal and average power equals N than so, want to amplify the nonlinear distortion phenomenon that sort signal does not occur that amplitude limit causes, must carry out back-off, adopt the rated power of 1dB compression point to equal the power tube of peak power.This just need to adopt N doubly to the rated power power tube of average power size, to amplify, or says the back-off that need to have 10LogN (dB).
It is worthless when N is larger, carrying out like this back-off, and for example N=48, needs rollback 16.8dB, and the average power of transmitting 10W need to adopt the power tube of 480W, and the volume and weight of power tube all can be too large, and the efficiency of radio-frequency power also can be too low.Therefore back-off value has to reduce, but back-off value just there will be signal limiter after reducing, and causes that nonlinear distortion and multicarrier intermodulation disturb, and this is inevitable.For example: according to theory derivation and simulation result, show, when the power value of returning value of moving back is taken as time, power tube amplifies the qpsk modulation signal of N frequency band, and in the situation that there is no other background noise, only the caused error rate of Intermodulation Interference will be greater than 10 -4, be equivalent to E b/ N 0=8.4dB, or signal to noise ratio equals 11.4dB.In other words, because disturbing, multicarrier intermodulation make the signal to noise ratio of radio-frequency (RF) power amplification pipe output signal just only have 11.4dB.This means while amplifying with single-carrier modulated signal is linear that the signal to noise ratio of output signal can reach 30dB compares above, because the rollback of power tube is not enough, may produce the snr loss about 20dB.The pre-quite serious loss at last of this signal to noise ratio for down link.
In addition, larger back-off value not only can make power tube volume and weight become large, but also can make radio-frequency power Efficiency Decreasing; If the efficiency of radio-frequency power amplifier can adopt the power tube of 5～7dB rollback higher than 30% during inactivity rollback, its power efficiency just may be reduced to 15% left and right.This signal to noise ratio budget for down link is again an additional loss.
According to above-mentioned estimation, in the present invention, user's down link adopts the time division multiplexing single-carrier modulated mode based on IP-OVER-DVB-S standard agreement to transmit, adopt the FDMA transmission system of 48 frequency bands to compare with WGS, down link can increase the link margin of 20dB left and right.This link margin can be used for reducing mobile subscriber's antenna aperture, for example, antenna aperture is reduced to 0.4 meter by 1.5 meters, because can mobile subscriber's antenna aperture reduce, is mainly limited to the signal to noise ratio budget of down link.For X or Ku frequency range, " communication in moving " antenna aperture is reduced to 0.4 meter by 1.5 meters, and its manufacturing cost may reduce manyfold.And the manufacturing cost of " communication in moving " antenna proportion in the manufacturing cost of whole terminal equipment is very large, may reach 80～90%, even larger; Thereby so reduce antenna aperture, just can significantly reduce the total manufacturing cost of each mobile subscriber terminal.
7, result of use is good and practical value is high, can support train, aircraft, steamer and some to carry out the broadband internet application that comprises real-time multimedia traffic on the communication truck of emergent or special duty.On star, multi-beam antenna has N in conjunction with one of signal processing formation on star bindividual honeycombed community (cell) covers ground and corresponding spatial domain thereof.For the user in each community, on star, can carry out respectively the send and receive of signal, but for receiving signal, except comprising the scattered IP bag signal of signaling information, on star, do not carry out demodulation coding, and only after along separate routes, just by programme-controlled exchange module, carry out wave beam exchange, and carry out bidirectional transfer of information with NCC or each juncture station.Therefore, wide-band mobile communication system of the present invention is based on processing and the cocommutative large capacity satellite communication system of star on non-regenerative star.Owing to not carrying out the modulation of demodulation coding and recompile on star, so the complexity of on-board equipment, power consumption, volume and weight all reduce relatively, and available limited GEO satellite resource is supported all very large communication systems of message capacity and number of users.During actual use, mobile subscriber terminal employing MF-TDMA and SCDMA mode send with the speed of 0.4～28Mbps, adopt IP-over-DVB-S form to receive with the speed of 155Mbps, can be used for supporting the occasions such as aircraft, train, steamer, Emergency communication vehicle to comprise that multimedia service is in interior internet, applications.
In sum, the present invention is reasonable in design, realization is convenient and result of use is good, practical value is high, can, for supporting the occasions such as the multiple vehicles, Emergency communication vehicle to comprise the broadband the Internet applications of real-time multimedia traffic, can also provide the internet service that is similar to 4G mobile communication level for a large amount of personnel on the multiple vehicles.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the use state reference map of wide-band mobile communication system of the present invention.
Fig. 2 is the fundamental diagram of on-board equipment of the present invention.
Fig. 3 is process flow block diagram on the star in user's closed loop synchronization loop of the present invention.
Fig. 4 is the fundamental diagram of network management control system of the present invention.
Description of reference numerals:
1-earth station equipment; 1-1-network control center; 1-2-juncture station;
2-on-board equipment; 2-1-programme-controlled exchange module; 2-2-ip router;
OAMAgent module on 2-4-star; 2-5-frequency division Demultiplexing module; 2-6-time-division Demultiplexing module;
2-7-MF-QOTDM multiple connection module; 2-8-the first multi-beam dual-mode antenna;
2-9-first signal Transmit-Receive Unit; 2-10-quadrature frequency conversion module;
2-11-the second multi-beam dual-mode antenna;
2-12-secondary signal Transmit-Receive Unit;
2-13-SCDMA access module; 2-14-data conversion module; 3-mobile subscriber terminal;
3-1-Internet user; 3-2-destination host; 4-1-core router;
4-2-edge router; 4-3-VoIP source host; 4-4-HTTP source host;
4-5-FTP source host.
Embodiment
As shown in Figure 1 and Figure 2, a kind of wide-band mobile communication method based on multi-beam GEO satellite of the present invention, passes through (N between the on-board equipment 2 on GEO satellite and earth station equipment g+ 1) bar is two-way is fed to link bidirectional communication, and on-board equipment 2 and N tbetween individual mobile subscriber terminal 3, pass through N bbar Double-Direction User link carries out two-way communication; N g, N tand N bbe positive integer, N g>=2, N b=69～200; Described earth station equipment comprises the 1-1 of the Yi Ge network control center and N gthe individual 1-2 of juncture station.The described two-way link that is fed to comprises line feed link and lower line feed link, (N g+ 1) described in bar, the two-way link that is fed to all adopts Ka frequency range spot beam to carry out transfer of data, and realizes (N g+ 1) inferior space division multiplexing; Described Double-Direction User link comprises user uplink link and user's down link, N bdescribed in bar, Double-Direction User link all adopts user link wave beam to carry out transfer of data, and described user link wave beam is X band beam, Ku band beam or or Ka band beam.
During actual use, N g=8～16, N t=14352～83200.In actual application, can be according to specific needs, to N gand N bvalue size adjust accordingly.
Described on-board equipment 2 and N tindividual described mobile subscriber terminal 3 adopts the cellular network being formed by satellite antenna wave beam to carry out bidirectional data transfers, the bandwidth of frequency band that described cellular network adopts is that 260MHz and this frequency band division are the sub-band of 4 65MHz bandwidth, and the frequency of 4 described sub-bands is all not identical.Described cellular network is divided into N altogether bindividual cellular cell, described in each, cellular cell is all corresponding to N ba Double-Direction User link described in bar in Double-Direction User link, every 4 adjacent cellular cells form Yi Ge community family, N bindividual described cellular cell belongs to N b/ 4 community families, all comprise 4 described cellular cells in the family of community described in each, and described in each, 4 described cellular cells in the family of community adopt respectively 4 described sub-bands to carry out transfer of data, thereby make the frequency resource of 260MHz bandwidth realize N b/ 4 space division multiplexings; N beach user uplink link in individual described user's two-way link is the subband signal of 26 the 2.5MHz bandwidth of transmission by a 65MHz bandwidth all, described subband signal is the signal that mobile subscriber terminal 3 need be sent to on-board equipment 2, the channel of 65MHz bandwidth is divided into 26 sub-band channel of transmitting for 26 described subband signals respectively, and described in each, user uplink link all comprises 26 described sub-band channel.Frame period is T fmillisecond, every frame is divided into N sindividual time slot carries out communication, wherein T f=5～20, N s=8～16.N bevery user's down link in individual described user's two-way link is respectively by the channel transmission data of a 65MHz bandwidth; N tindividual described mobile subscriber terminal 3 shares N bdescribed in bar, Double-Direction User link carries out transfer of data, N t=(N s-1) * 26 * N b.
In conjunction with Fig. 2, the data transmission procedure of described user uplink link is as follows:
Step 101, signal are uploaded: (the N in each cellular cell s-1) * 26 mobile subscriber terminals 3 with MF-TDMA mode transmitted signal, are sent to on-board equipment 2 by described user uplink link; The signal that mobile subscriber terminal 3 transmitted signals are IP traffic.And the signal that mobile subscriber terminal 3 sends is digital modulation signals (also claiming base band complex envelope signal).
Signal tap and processing on step 102, star: described on-board equipment 2 in MF-TDMA mode to every (N that user uplink link is transmitted in step 101 s-1) * 26 subscriber signals carry out frequency division tap and time-division tap processing; In every frame except the signal of the 1st time slot, all the other (N s-1) signal of individual time slot is all sent into programme-controlled exchange module 2-1 and is carried out programme-controlled exchange.Wherein, described subscriber signal is the signal that in step 101, mobile subscriber terminal 3 sends.
In every frame, the signal of the 1st time slot accesses with Synchronous-Code Division Multiple Access, and is in harmonious proportion after decoding through despreading, solution, sends into ip router 2-2 and carries out IP exchange.In every frame, the signal of the 1st time slot carries out despreading, separates mediation decoding on star.
The data transmission procedure of described user's down link is as follows:
Data transaction and modulation on step 201, star: the IP traffic that the need of ip router 2-2 output is sent to mobile subscriber terminal 3 is changed the data flow that forms IP-over-DVB-S form, then carries out Digital Modulation;
Step 202, signal pass down: Digital Modulation gained signal in step 201 is sent to corresponding mobile subscriber terminal 3 by described user's down link; The bandwidth of the corresponding described user's down link in each cellular cell is 65MHz.
The data transmission procedure of described upper line feed link is as follows:
Step 301, signal are uploaded: by described upper line feed link, the information that the 1-2 of 1-1Huo juncture station of the network control center is sent is sent to on-board equipment 2 with IP-over-SDH form; The total bandwidth of every described upper line feed link is W umHz, W u=65 * N b/ [(N g+ 1) η], the ratio of the band efficiency of the 1-2 of 1-1Huo juncture station of ηWei network control center digital modulation mode used and the band efficiency of user's down link digital modulation mode used wherein.
On step 302, star, signal receives and processes: described on-board equipment 2 receives after the signal that the 1-2 of 1-1Huo juncture station of the step 301Zhong network control center transmits, and first carries out demodulation and decoding, then sends into ip router 2-2 and carry out IP exchange.
The data transmission procedure of described lower line feed link is as follows:
The multiple connection of multiple signals and modulation on step 401, star: the base band complex envelope signal that the need of programme-controlled exchange module 2-1 output is sent to a plurality of users of earth station equipment 1, and the need of ip router 2-2 output are sent to the IP traffic of earth station equipment 1 through the base band complex envelope signal of Digital Modulation gained, carry out after MF-QOTDM multiple connection, then carry out multi-carrier modulation; Every described lower line feed link is modulated to N b/ (N g+ 1) the QOTDM signal of individual carrier modulation, each QOTDM signal forms by the base band complex envelope signal multiplexing of 26 2.5MHz bandwidth, and the bandwidth of each QOTDM signal is 65MHz, wherein in each base band complex envelope signal, contains (N s-1) individual MF-TDMA signal.
Wherein, MF-QOTDM is multiband QOTDM, and MF-QOTDM transmission method is multiband QOTDM transmission method, disclosed quasi OTDM transmitting method in the application for a patent for invention that described QOTDM transmission method is notification number CN1845487B; While carrying out MF-QOTDM multiple connection, the multiple connection method adopting is multiple connection method used in described QOTDM transmission method.MF-QOTDM multiple connection refers to while carrying out respectively the multiple connection of a plurality of frequency bands and multiple connection all carries out multiple connection according to the multiple connection method adopting in QOTDM transmission method.MF-TDMA signal is the subscriber signal that on-board equipment 2 receives in MF-TDMA mode.
While carrying out MF-QOTDM multiple connection, because the base band complex envelope signal multiplexing of each QOTDM signal by 26 2.5MHz bandwidth forms, each base band complex envelope signal that multiple connection forms QOTDM signal includes two parts base band complex envelope signal, a part is the base band complex envelope signal of programme-controlled exchange module 2-1 output, and this base band complex envelope signal is corresponding to (the N in every frame s-1) signal of individual time slot; Another part is the base band complex envelope signal of IP traffic gained after digital modulation module modulation of ip router 2-2 output, and this base band complex envelope signal is corresponding to the signal of the 1st time slot in every frame.
Under step 402, signal, pass and reception & disposal: by described lower line feed link, multiple connection in step 401 and modulation gained signal are sent to the corresponding 1-2 of 1-1Huo juncture station of the network control center; Then, carry out multicarrier solution mediation QOTDM tap and process in the 1-2 of 1-1Huo juncture station of the network control center, every described lower line feed link carries out N b/ (N g+ 1) individual carrier wave demodulation, each carrier wave demodulation result is carried out QOTDM tap again, respectively obtains 26 base band complex envelope signals; Each base band complex envelope signal carries out time-division tap again, respectively obtains 8 complex baseband signals; Again gained complex baseband signal is carried out respectively to demodulation coding.
Wherein, the complex envelope that base band complex envelope signal is bandpass signal.QOTDM tap refers to according to the tapping method adopting in QOTDM transmission method carries out tap.
In the present embodiment, described mobile subscriber terminal 3 is a kind of two-way communication terminals (Return-Channel-Satellite-Terminal is called for short RCST) with satellite channel passback.During actual use, described mobile subscriber terminal 3 can be both a wideband multimedia terminal, also can be a local area network (LAN) satellite link interface termination (being the interface termination of local area network (LAN) and satellite network) of supporting Internet application, and comprise a plurality of Internet user 3-1 in the local area network (LAN) that connects of this mobile subscriber terminal 3.And a plurality of Internet user 3-1 in described local area network (LAN) all join by local area network (LAN) and destination host 3-2.Described local area network (LAN) is laid in the occasions such as the various vehicles or Emergency communication vehicle.
The signal transmitting and receiving that the described 1-2 of juncture station comprises Ka frequency range dual-mode antenna, join with Ka frequency range dual-mode antenna and treatment facility, the core router 4-1 joining with described signal transmitting and receiving and treatment facility and the edge router 4-2 communicating by Internet network and core router 4-1, described edge router 4-2 and a plurality of source host join, and described source host is VoIP source host 4-3, HTTP source host 4-4 or FTP source host 4-5.
In the present embodiment, N tit is synchronous that the time synchronized deviate that individual described mobile subscriber terminal 3 all detects according to on-board equipment 2 is carried out closed loop, and described in each user uplink link by the synchronous transmission of the synchronous achieve frame of closed loop and time slot.Carry out closed loop when synchronous, described on-board equipment 2 detects each mobile subscriber terminal 3 and at the synchronous head of each frequency band and each time slot signal transmitted, arrives the time synchronized deviate of on-board equipment 2, and after being modulated to digital modulation signals, this time synchronized deviate is sent to corresponding mobile subscriber terminal 3 by described user's down link, this mobile subscriber terminal 3 receives after described digital modulation signals, according to the synchronism deviation value size receiving, adjust its transmission delay, the synchronism deviation of the synchronous head arrival on-board equipment 2 of next transmitted signal is reduced, thereby it is synchronous to realize closed loop.
In the present embodiment, before the signal that the need that by described upper line feed link, the 1-2 of 1-1Huo juncture station of the network control center sent in step 301 are uploaded to GEO satellite is sent to on-board equipment 2, the division of signal that first need is uploaded to GEO satellite is N sgroup; Every group of signal is all adapted for the link signal form of SDH host-host protocol, then carries out chnnel coding and become the bit stream of 320Mbps with 1/2 code check, is modulated into the signal that bandwidth is 200MHz afterwards through QPSK; When the signal that need is uploaded to GEO satellite by described upper line feed link is sent to on-board equipment 2, N sthe signal of individual 200MHz bandwidth carries out uplink in frequency division multiplexing (FDM) mode in the channel of Ka frequency range spot beam; On-board equipment described in step 302 2 receives N safter the signal of individual 200MHz bandwidth, first received signal is carried out along separate routes, separates mediation decoding, then send into ip router 2-2 and carry out IP exchange.
Wherein, N sfor positive integer and N s=4～16.Described on-board equipment 2 receives N sthe signal of individual 200MHz bandwidth and received signal is carried out along separate routes, separates and be in harmonious proportion after decoding, recovers data message.
Herein, the link signal form that is adapted for SDH host-host protocol is 155.52Mbps, and in the present embodiment, the link signal form of SDH host-host protocol is STM1 or STM4 link signal form.
During actual use, while carrying out transfer of data by described user's down link in step 202, it is the signal that IP-over-DVB-S data flow is obtained through single carrier Digital Modulation that data are transmitted in institute; While modulating in step 201, adopt high-order modulating to modulate described IP-over-DVB-S data flow.
In the present embodiment, the high-order modulating adopting is the digital modulation mode of QPSK, OQPSK, TCM or 16APSK.
(the N in MF-TDMA mode, every user uplink link being transmitted in step 102 s-1) * 26 subscriber signals carry out frequency division tap and time-division tap while processing, and in frame synchronization mode, access.N tindividual mobile subscriber terminal 3 all be take the frame synchronization clock of on-board equipment 2 issue and is carried out synchronously as benchmark, and the frame period is T fmillisecond and T f=5～20.
During actual use, while carrying out transfer of data by described lower line feed link in step 402, adopt MF-QOTDM transmission method to carry out transfer of data, synchronizing sequence adopts pseudo noise code and its to double as spreading code and uses, and this spreading code is for being sent to the need of ip router 2-2 output the IP data spread spectrum of earth station equipment and being transferred to the corresponding 1-2 of 1-1Huo juncture station of the network control center.Wherein, synchronizing sequence is also referred to as synchronous and pilot frequency sequence.
In the present embodiment, when in step 102, in every frame, the signal of the 1st time slot accesses with Synchronous-Code Division Multiple Access, the channel competition mechanism that adopts carrier sense, sends scattered IP packet with Synchronous-Code Division Multiple Access, comprises signaling information and HTTP service note breath.Again the signal of described scattered IP packet is carried out despreading, separated after mediation decoding, send into ip router 2-2 and carry out IP exchange, after IP exchange, deliver to respectively OAMAgent module 2-4 on corresponding user's down link, lower line feed link or star.Wherein, the signal of described scattered IP packet is digital modulation signals (also referred to as base band complex envelope signal).
While carrying out transfer of data by described upper line feed link in step 301, the data that transmit are IP-over-DVB-S data flow, and the data transfer mode adopting is SDH transmission means.
In the present embodiment, in step 102 on-board equipment 2 in MF-TDMA mode to every (N that user uplink link is transmitted in step 101 s-1) * 26 described subscriber signals carry out frequency division tap and time-division tap while processing, first by quadrature frequency conversion module 2-10, received signal is carried out to quadrature frequency conversion and be converted to complex baseband signal, by frequency division Demultiplexing module 2-5, carry out frequency division tap again, by time-division Demultiplexing module 2-6, carry out time-division tap again, then send into programme-controlled exchange module 2-1 and exchange; While carrying out the data multiplexing of multiple signals on star in step 401, adopt MF-QOTDM multiple connection module 2-7 to carry out multiple connection; The N of the module of programme-controlled exchange described in step 102 2-1 bindividual input port respectively with the joining for exporting the data output interface of base band complex envelope signal sampling point sequence of time-division Demultiplexing module the 2-6, (N of programme-controlled exchange module 2-1 g+ 1) individual output port respectively with (N g+ 1) Data Input Interface of individual MF-QOTDM multiple connection module 2-7 joins; The granularity of described programme-controlled exchange module 2-1 exchange is the sampling point sequence data of a time slot in a bandwidth described base band complex envelope signal that is 2.5MHz; When programme-controlled exchange module 2-1 carries out programme-controlled exchange, according to the switching and routing table of being set up by described signaling information, by N bthe sampling point sequence data that individual input port is sent into is transferred to respectively corresponding output port; The update cycle of described switching and routing table is (N f* T f) millisecond, wherein N ffor positive integer and N f=1～20.
When 26 described subband signals that in step 102, on-board equipment 2 is transmitted described user uplink link in MF-TDMA mode carry out multiple access access, first by quadrature frequency conversion module 2-10, received signal is carried out to quadrature frequency conversion processing, carrying out frequency division Demultiplexing module 2-5 and time-division Demultiplexing module 2-6 carries out, after frequency division tap and time-division tap, sending into programme-controlled exchange module 2-1 again; While carrying out on star data multiplexing in step 401, adopt MF-QOTDM multiple connection module 2-7 to carry out multiple connection.The N of the module of programme-controlled exchange described in step 102 2-1 bindividual input port respectively with the joining for exporting the data output interface of base band complex envelope signal sampling point sequence of time-division Demultiplexing module the 2-6, (N of programme-controlled exchange module 2-1 g+ 1) individual output port respectively with (N g+ 1) Data Input Interface of individual MF-QOTDM multiple connection module 2-7 joins; The granularity of described programme-controlled exchange module 2-1 exchange is the sampling point sequence data of a time slot in a bandwidth described base band complex envelope signal that is 2.5MHz; When programme-controlled exchange module 2-1 carries out programme-controlled exchange, according to the switching and routing table of being set up by described signaling information by N bthe sampling point sequence data that individual input port is sent into is transferred to respectively corresponding output port.The update cycle of described switching and routing table is (N f* T f) millisecond, wherein N ffor positive integer and N f=1～20.
In the present embodiment, while carrying out frequency division tap in step 102, the frequency division Demultiplexing module of employing based on 32 FFT is 26 base band complex envelope signals by received signal tap, with time-division Demultiplexing module 2-6, each the base band complex envelope signal in resulting 26 base band complex envelope signals is carried out respectively to time-division tap again, after each base band complex envelope signal time-division tap, all obtain the signal of 8 time slots, realized the time-division tap of MF-TDMA mode.
In the present embodiment, the information content that transmits signal by described lower line feed link in step 402 is IP packet, the 1-2 of 1-1Huo juncture station of the described network control center receives after the signal transmitting by described lower line feed link, first carry out shunt, separate mediation decoding, then the IP packet that wherein belongs to local internet is sent into local router and carry out IP exchange; And need be sent to by on-board equipment 2 the IP packet of mobile subscriber terminal 3, first by described upper line feed link, be sent to on-board equipment 2, then be sent to corresponding mobile subscriber terminal 3 by described user's down link.
That is to say the described 1-1 of the network control center and N gthe signal processing of the individual described 1-2 of juncture station is: the multiple signals that first described lower line feed link transmission come carry out along separate routes, separate mediation decoding, again by local ip router and gateway, the IP packet that destination address is belonged to local internet, delivers to radio communication core net and carries out IP exchange; And other need to be delivered to by on-board equipment 2 to the IP packet of field network address, form IP-over-SDH data flow, and by described upper line feed link transmission to star, to send to each mobile subscriber terminal 3 by user's down link on star.
To sum up, because described lower line feed link is W by a bandwidth dtransmission 26 * N b/ (N g+ 1) the described base band complex envelope signal of individual 2.5MHz bandwidth, bandwidth is W dfrequency band be divided into N b/ (N g+ 1) when sub-frequency bands, thereby step 401 is carried out MF-QOTDM multiple connection, to 26 * N b/ (N g+ 1) the individual base band complex envelope signal transmitting from frequency band carries out respectively multiple connection, and when each base band complex envelope signal is carried out to multiple connection, all adopts QOTDM multiple connection method to carry out obtaining QOTDM signal after multiple connection and multiple connection; It is all that the base band complex envelope signal of 2.5MHz is through the resulting QOTDM signal of QOTDM multiple connection by 26 bandwidth that every sub-frequency bands in described lower line feed link is all transmitted one; Actual while carrying out multi-carrier modulation, every described lower line feed link is modulated to N b/ (N g+ 1) the QOTDM signal of individual carrier modulation, each QOTDM signal forms by the base band complex envelope signal multiplexing of 26 2.5MHz bandwidth and its bandwidth is 65MHz, wherein in each base band complex envelope signal, contains (N s-1) individual tdma signal.Wherein, W d=1～3GHz.MF-QOTDM multiple connection refers to carries out N b/ (N g+ 1) the QOTDM multiple connection of individual frequency band, MF-QOTDM tap is that MF-QOTDM separates multiple connection.
A kind of wide-band mobile communication system based on multi-beam GEO satellite as shown in Figure 1, comprises the on-board equipment 2 being laid on GEO satellite, the earth station equipment and the N that are laid in ground and carry out two-way communication with on-board equipment 2 tindividual N tthe mobile subscriber terminal 3 of two-way communication is carried out in the individual relay transmission effect by on-board equipment 2, and described earth station equipment comprises the 1-1 of the Yi Ge network control center and N gthe individual 1-2 of juncture station, N gfor positive integer and N g>=2.
Described on-board equipment 2 comprises ip router 2-2, programme-controlled exchange module 2-1, N bindividual data conversion module 2-14, can produce N bthe first multi-beam dual-mode antenna 2-8 of individual described user link wave beam, can produce (N g+ 1) the second multi-beam dual-mode antenna 2-11 of individual described Ka frequency range spot beam, the first signal Transmit-Receive Unit 2-9 joining with the first multi-beam dual-mode antenna 2-8 and the secondary signal Transmit-Receive Unit 2-12 joining with the second multi-beam dual-mode antenna 2-11, the N that described secondary signal Transmit-Receive Unit 2-12 receives bindividual signal is sent into programme-controlled exchange module 2-1 respectively after quadrature frequency conversion module 2-10, frequency division Demultiplexing module 2-5 and time-division Demultiplexing module 2-6.The quantity of described quadrature frequency conversion module 2-10, frequency division Demultiplexing module 2-5 and time-division Demultiplexing module 2-6 is N bindividual, N bindividual described time-division Demultiplexing module 2-6 for the data output interface of exporting base band complex envelope signal sampling point sequence respectively with the N of programme-controlled exchange module 2-1 bindividual input port joins.(the N of described programme-controlled exchange module 2-1 g+ 1) individual output port respectively with (N g+ 1) input interface of individual MF-QOTDM multiple connection module 2-7 joins, (N g+ 1) output port of individual MF-QOTDM multiple connection module 2-7 respectively with (N g+ 1) individual described secondary signal Transmit-Receive Unit 2-12 joins.
N bindividual described time-division Demultiplexing module 2-6 for exporting the data-out port of the 1st time slot signal, all join with the data-in port of SCDMA access module 2-13; On the signaling information output port of SCDMA access module 2-13 and star, the signaling information input port of OAMAgent module 2-4 joins, and on described star, OAMAgent module 2-4 and programme-controlled exchange module 2-1 join.
The IP packet output port of described SCDMA access module 2-13 and ip router (2-2) join, and on described star, the IP data input/output interface of OAMAgent module 2-4 and ip router 2-2 join.(N g+ 1) the IP data-in port of individual described MF-QOTDM multiple connection module 2-7 all joins with ip router 2-2, N bthe IP data-in port of individual described data conversion module 2-14 all joins with ip router 2-2, N bthe output port of individual described data conversion module 2-14 respectively with N bindividual the first modulation module 1-15 joins, N bindividual described the first modulation module 1-15 all joins with first signal Transmit-Receive Unit 2-9.
IP data output interface and the ip router 2-2 of described secondary signal Transmit-Receive Unit 2-12 join; (N g+ 1) output port of individual described MF-QOTDM multiple connection module 2-7 respectively with (N g+ 1) individual the second modulation module 1-16 joins, (N g+ 1) individual described the second modulation module 1-16 all joins with secondary signal Transmit-Receive Unit 2-12.
In the present embodiment, described first signal Transmit-Receive Unit 2-9 and quadrature frequency conversion module 2-10, frequency division Demultiplexing module 2-5, time-division Demultiplexing module 2-6, SCDMA access module 2-13, N bindividual described data conversion module 2-14 and N bindividual described the first modulation module 1-15 forms first signal transmitting-receiving and processing unit.Described secondary signal Transmit-Receive Unit 2-12, MF-QOTDM multiple connection module 2-7 and (N g+ 1) individual described the second modulation module 1-16 forms secondary signal transmitting-receiving and processing unit.
Thereby, in wide-band mobile communication system based on multi-beam GEO satellite of the present invention, on the described first signal transmitting-receiving that described on-board equipment 2 is used in combination by the first multi-beam dual-mode antenna 2-8, with the first multi-beam dual-mode antenna 2-8 and processing unit, the second multi-beam dual-mode antenna 2-11, the described secondary signal transmitting-receiving being used in combination with the second multi-beam dual-mode antenna 2-11 and processing unit, programme-controlled exchange module 2-1, an ip router 2-2 and a star, OAMAgent module 2-4 forms.In described earth station equipment, comprise N gthe individual 1-2 of juncture station (Gateway) the He Yige 1-1 of the network control center (being called for short NCC) can support N at most for network control management tindividual mobile subscriber terminal 3 communicates simultaneously.
In the present embodiment, described frequency division Demultiplexing module 2-5 is the frequency division Demultiplexing module based on 32 FFT (fast fourier transform).
In the present embodiment, in conjunction with Fig. 4, OAMAgent module 2-4, N on the described 1-1 of the network control center, star gnetwork management information interface unit and the N of the individual described 1-2 of juncture station tthe webmaster performance element of individual described mobile subscriber terminal 3 forms network management control system, described network management control system forms a star IP network, the Centroid of described star IP network is the 1-1 of the network control center, OAMAgent module 2-4, N on described star gdescribed network management information interface unit and the N of the individual described 1-2 of juncture station tthe described webmaster performance element of individual described mobile subscriber terminal 3 is the terminal node of described star IP network.
During actual use, described network management control system is carried out the management work of user access control, programme-controlled exchange and IP exchange.Wherein, the described 1-1 of the network control center is the center of ground network control management and IP exchange, and the 1-1 of the network control center is the Centroid of described star IP network.
The outgoing link of described star IP network (i.e. the transmission link to each terminal node by Centroid) is divided into two sections: one section in described upper line feed link a part of subchannel realize, another section in described lower line feed link in a part of subchannel and described user's down link a part of subchannel realize; In it, to link (i.e. the transmission link to Centroid by each terminal node), be also divided into two sections: one section in described upper line feed link in a part of subchannel and described user uplink link a part of subchannel (i.e. the 1st time slot) realize, another section a part of subchannel in described lower line feed link is realized.Because the transmission means of described lower line feed link is MF-QOTDM transmission, its synchronizing sequence is pseudo noise code, and the information that this pseudo noise code is carried network management system in DS mode is transmitted, and extra busy channel resource.
To sum up, N bin individual described user link wave beam, described in each, user link wave beam all contains a described Double-Direction User link, i.e. bi-directional transmission link between mobile subscriber terminal 3 and on-board equipment 2.The user uplink link of described Double-Direction User link is by mobile subscriber terminal 3, to on-board equipment 2, to be sent the communication link of data, and user's down link of described Double-Direction User link is by on-board equipment 2, to mobile subscriber terminal 3, to be sent the communication link of data.Described on-board equipment 2 and N tindividual described mobile subscriber terminal 3 adopts described cellular network to carry out bidirectional data transfers, and adopt the frequency range of 260MHz in X frequency range, Ku frequency range (the specifically extended frequency band of Ku frequency range) or Ka frequency range, the frequency band division of this 260MHz bandwidth is the frequency band of 4 65MHz bandwidth, and adopts multibeam satellite antenna (specifically the first multi-beam dual-mode antenna 2-8) to form N b(be terrestrial cellular community, cell), these cellular cells are divided into N in individual cellular cell b/ 4 community families (cell cluster), each frequency of utilization difference of 4 cellular cells in each community family and frequency band that bandwidth is 65MHz, thus make the frequency resource of 260MHz bandwidth realize N bthe space division multiplexing of/4 times.
Described N buser uplink link described in bar in Double-Direction User link, on star, adopting frequency division Demultiplexing module (also the claiming frequency division demodulation multiplexer) tap based on 32 FFT (fast fourier transform) is 26 base band complex envelope signals (this signal is digital signal); 26 sub-band channel of every user uplink link adopt MF-TDMA (multiband-time division multiple access) mode to realize multiple access access, with T fmillisecond is the frame period, and every frame is divided into 8～16 time slots; Except the 1st time slot, all the other time slots are all distributed to different user according to signaling information and are sent tdma signal, and the signal of these time slots do not carry out demodulation coding on star, but be forwarded to earth station equipment, carry out demodulation coding again.Described the 1st time slot adopts carrier sense mechanism (based on random competition mode), in S-CDMA—Synchronous Code Division Multiple Access (SCDMA) mode, sends scattered IP packet, and the scattered IP packet sending comprises signaling information; The MF-CDMA signal of these time slots carries out despreading, separate to be in harmonious proportion after decoding on star, and the scattered IP packet obtaining, after ip router 2-2 carries out IP exchange, is incorporated to corresponding described user's down link or described lower line feed link sends; Meanwhile, the signaling information in scattered IP packet is delivered to OAMAgent module 2-4 on star, for exchange of management on access control and star.Described N buser's down link described in bar in Double-Direction User link, the channel by a 65MHz bandwidth is with IP-over-DVB-S data stream transmitting broadband IP data message, and wherein DVB is the english abbreviation of Digital Video Broadcast.
Because the 1st time slot adopts carrier sense mechanism and carry out data transmission in S-CDMA—Synchronous Code Division Multiple Access (SCDMA) mode, and for the random transmission of IP packet, to accelerate the direct access of internet; So-called carrier sense is herein to utilize the synchronous error information that sends to each mobile subscriber terminal 3 in described user's down link, judges channel idle situation.The CDMA signal of the 1st time slot carries out despreading, separates mediation decoding on star, obtains scattered IP packet, through ip router 2-2 on star, carries out after IP exchange, is incorporated to corresponding described user's down link or described lower line feed link transmission.Owing to adopting MF-TDMA and two kinds of access modes of SCDMA, the speed that makes mobile subscriber terminal 3 send information has very large variable dynamic range, can to tens Mbps, select flexibly from tens Kbps, and this is for supporting that internet, applications is very favourable.
In actual use procedure, due to N bthe signal that in individual described user link wave beam, all mobile subscriber terminals 3 send, on star equal advanced line frequency along separate routes after, respectively obtaining 26 bandwidth is all the base band complex envelope signal of 2.5MHz, and after completing time-division tap, deliver to programme-controlled exchange module 2-1 and exchange, afterwards from the (N of programme-controlled exchange module 2-1 g+ 1) individual output port is delivered to respectively (N g+ 1) input interface of individual described lower line feed link, then undertaken by MF-QOTDM transmission method; Every described lower line feed link is bandwidth W dfrequency range (W d=1～3GHz) be divided into N b/ (N g+ 1) individual frequency band, the base band complex envelope signal that one of each frequency band transmission is 2.5MHz by 26 bandwidth is through the resulting signal of QOTDM multiple connection; Every described lower line feed link transmits 26N b/ (N g+ 1) individual bandwidth is all the base band complex envelope signal of 2.5MHz, (N g+ 1) described in bar, lower line feed link transmits 26N altogether bindividual bandwidth is all the base band complex envelope signal of 2.5MHz, has comprised the information that all mobile subscriber terminals 3 send.
During actual use, it is benchmark that the whole wide-band mobile communication system based on multi-beam GEO satellite be take the frame synchronization clock of issuing on star, with frame synchronization and slot synchronization mode, work, it is synchronous that each mobile subscriber terminal 3 is realized closed loop by the synchronous error information (being time synchronism deviation value) that detects on star and issue.In conjunction with Fig. 3, pass through N bindividual described time-division Demultiplexing module 2-6 is to N bdescribed in bar, user uplink signal that link transmits carries out after time-division tap, first by the synchronous head of sliding correlation method detection signal, and carry out synchronous error estimation according to the synchronised clock under present case (being described frame synchronization clock), and determine each mobile subscriber terminal 3 each frequency band and each time slot by described user uplink link in time synchronized deviate on the synchronous head arrival star of signal transmitted, and this time synchronism deviation value is modulated to digital modulation signals, and be packaged into IP bag (be about to detect obtain time synchronized deviation information be packaged into IP bag), again after ip router 2-2 carries out IP exchange, by corresponding described user's down link, send to each mobile subscriber terminal 3, after each mobile subscriber terminal 3 is received this time synchronized deviate, correspondence is adjusted its transmission delay, the time synchronized deviation that the synchronous head of next transmitted signal arrives on star is reduced, thereby it is synchronous to realize closed loop.
Described (N g+ 1) individual Ka frequency range spot beam forms the two-way link that is fed between earth station equipment and on-board equipment 2, with (N g+ 1) inferior space division multiplexing mode shared frequencies resource.Wherein, (N g+ 1) described in bar, descending line feed link all to adopt same width is W dfrequency band, W d=65 * 1.25 * N b/ (N g+ 1) MHz; Every described lower line feed link all adopts multiband-quasi OTDM (MF-QOTDM) mode to transmit N dindividual bandwidth is all the base band complex envelope signal of 2.5MHz, N d=26N b/ (N g+ 1), wherein comprised the information that all mobile subscriber terminals 3 send.(N g+ 1) described in bar upper line feed link all to adopt same width be W ufrequency band, W wherein u=65 * N b/ (N g+ 1) MHz; For sending to all data messages of each mobile subscriber terminal 3, be all fed to star, each described upper line feed link all adopts SDH (Synchronous Digital Hierarchy) agreement, transmission 65 * N b/ (N g+ 1) data flow of MHz bandwidth.
(N g+ 1) described in bar, the two-way link that is fed to all adopts Ka frequency range spot beam, with (N g+ 1) inferior space division multiplexing mode shared frequencies resource.Wherein, (N g+ 1) described in bar, descending line feed link all to adopt same width is W dthe frequency band of MHz, W d=65 * 1.25 * N b/ (N g+ 1) some overheads that need while, taking advantage of the factor 1.25 for the multiplexed transmission of consideration.Every described lower line feed link all adopts MF-QOTDM (multiband-quasi OTDM) mode, and (Granted publication number referring to application on July 11st, 2005 is disclosed transmission method in the < < quasi OTDM transmitting method > > application for a patent for invention of CN1845487B, at the beginning of artificial easy gram of invention, Wang Yong, Yi Hongfeng, Dong Hua and field red heart), each transmits 26N b/ (N g+ 1) the base band complex envelope signal that individual bandwidth is 2.5MHz, and (N g+ 1) described in bar, lower line feed link transmits 26 * N altogether bindividual base band complex envelope signal; The base band complex envelope signal of these 2.5MHz bandwidth be by described user uplink link be sent on star and after frequency division tap, time-division tap and programme-controlled exchange, reconfigure after resulting signal, this signal is not further processed on star, but be forwarded to earth station equipment by described lower line feed link, processes again.
(N g+ 1) described in bar upper line feed link all to adopt same width be W ufrequency band, W u=65 * N b/ (N g+ 1) MHz, is fed to star for sending to all data messages of each mobile subscriber terminal 3.Each described upper line feed link all adopts SDH (Synchronous Digital Hierarchy), and agreement (referring to CCITT Recommendation G.707, " Synchronous Digital Hierarchy Bit Rates ", Recommendation is G.709 " Synchronous Multiplexing Structure ", Blue Book, vol.3, Fascicle3.4, Nov.1988), transmission respectively has W u=65 * N b/ [(N g+ 1) η] data flow of bandwidth.
Described earth station equipment carries out demodulation, decoding and IP route switching to its received signal.Due to described upper line feed link transmission be multichannel data information, thereby adopt conventional SDH agreement in microwave telecommunications, with time division multiplexing, single carrier digital modulation mode, transmit.Due to described earth station equipment need transmitted signal in IP-over-SDH mode through described upper line feed link transmission.On star, again it is carried out to shunt and IP exchange, and be packaged into N bindividual IP-over-DVB-S data flow and be all modulated to the digital modulation signals of 65MHz bandwidth, then through described user's downlink transmission.
Described programme-controlled exchange module 2-1 is programme-controlled exchange circuit module on star, and this module has N bindividual input port, is connected respectively to N bthe data output interface of the base band complex envelope signal sampling point sequence of the transmitting-receiving of first signal described in user uplink link and processing unit described in bar; (the N of programme-controlled exchange module 2-1 g+ 1) individual output port, is connected respectively to (N g+ 1) Data Input Interface of individual MF-QOTDM multiple connection module 2-7.The granularity of described programme-controlled exchange module 2-1 exchange is the sampling point sequence data of a time slot in the bandwidth base band complex envelope signal that is 2.5MHz.Described programme-controlled exchange module 2-1 is according to the switching and routing table of setting up according to signaling information, and the sampling point sequence data that each input port of programme-controlled exchange module 2-1 is sent into, transfers to corresponding output port.
In actual use procedure, the effect of described programme-controlled exchange module 2-1 is: by N on star bthe signal that individual described the first multi-beam dual-mode antenna 2-8 receives, after frequency division tap and time-division tap, resulting sampling point sequence reconfigures, to carry out, after MF-QOTDM multiple connection, passes through (N g+ 1) described in bar, lower line feed link is fed to earth station equipment.
The input port of described ip router 2-2 is connected to OAMAgent module 2-4 on the IP data output interface, star of the transmitting-receiving of described first signal and processing unit and sends the IP data output interface of network management information and the IP data output interface of the transmitting-receiving of described secondary signal and processing unit; The output port of described ip router 2-2 is connected to OAMAgent module 2-4 on the IP Data Input Interface, star of the transmitting-receiving of described first signal and processing unit and receives the IP Data Input Interface of network management information and the IP Data Input Interface of the transmitting-receiving of described secondary signal and processing unit.
That is to say, the IP data of described ip router 2-2 only have two sources: the one, and on star, a time slot of each subband in the signal transmitting by described user uplink link is carried out despreading, separates and be in harmonious proportion the resulting scattered IP of decoding and wrap, comprise that signaling information and user carry out web page browsing click and the random IP bag producing; The 2nd, by earth station equipment, through described upper line feed link, sent to the IP traffic of the IP-over-SDH on star.Described ip router 2-2 according to its right whereabouts (according to the destination address of IP bag), transfers to interface on corresponding star, the output port connectivity port of concrete corresponding ip router 2-2 by these IP data.
During actual use, after ip router 2-2 carries out IP exchange, those carry the IP packet of signaling information, deliver on star OAMAgent module 2-4 or by each described lower line feed link, deliver to the 1-2 of 1-1Huo juncture station of the network control center and manage for network control.For need, be sent to the user profile IP bag of mobile subscriber terminal 3, comprise that the 1-2 of 1-1Huo juncture station of the scattered IPBao Heyou network control center obtaining on star sends to the IP traffic of the IP-over-SDH on star through described upper line feed link, deliver to the input data-interface of each described user's down link, be packaged into IP-over-DVB-S formatted data stream, being modulated to 16APSK signal sends (referring to Yi Kechu, Sun Yongjun, < < digital communication theory and system > > Electronic Industry Press 2013.10).
To sum up, wide-band mobile communication system based on multi-beam GEO satellite of the present invention, utilize multibeam satellite antenna (i.e. the first multi-beam dual-mode antenna 2-8 and the second multi-beam dual-mode antenna 2-11) to realize the space division multiplexing of frequency resource, wide-band mobile communication system can be selected be suitable for mobile communication X frequency range, Ku frequency range or or Ka frequency range, there is abundant frequency resource and support a jumbo satellite communication network.Wherein, described Double-Direction User link adopt X frequency range, Ku extended frequency band or or Ka frequency range in the frequency range of 260MHz, be divided into the frequency band of 4 65MHz bandwidth; Adopt multibeam satellite antenna to form N bindividual terrestrial cellular community (cell), these terrestrial cellular microzonations are divided into N b/ 4 community families (cell cluster), each frequency of utilization difference of 4 terrestrial cellular communities in each community family and frequency band that bandwidth is 65MHz, thus make the frequency resource of 260MHz bandwidth realize N bthe space division multiplexing of/4 times; Work as N b=200 o'clock, total available frequency resources was 13GHz.
In the present embodiment, N b=140, N g=8, described user link wave beam is Ku band beam.During actual use, can be according to specific needs, to N band N gvalue size adjust accordingly.Described GEO satellite is multi-beam GEO satellite.Wide-band mobile communication system based on multi-beam GEO satellite of the present invention can support at most 25480 Ku frequency range mobile subscriber terminals to communicate simultaneously, 26 * 7 * 140=25 wherein, 480.
In the present embodiment, described on-board equipment 2 comprises that the Ku frequency range of 140 wave beams receives/send out the frequency range of antenna and corresponding receptions/transmitted signal processing module (being described first signal transmitting-receiving and processing unit) thereof, 9 Ka wave beams and receive/send out antenna and OAMAgent module 2-4 on reception/transmitted signal processing module (being that described secondary signal is received and dispatched and processing unit), 1 programme-controlled exchange module 2-1, an ip router 2-2 and a star accordingly thereof.
The 1-2 of 1-1He Ge juncture station of the described network control center has IP exchange and routing function.By national broadband wireless core backbone, network management center and the public internet in each department is connected the described 1-2 of juncture station, while making all mobile subscribers access in the Internet at a distance arbitrarily network address, can select a most suitable 1-2 of juncture station and the two-way link that is fed to thereof by programme-controlled exchange module 2-1, the 1-2 of Zai Yougai juncture station conducts interviews through ground network route.Specific embodiments is as follows:
The first, the frequency planning of mobile subscriber's link and performance evaluation:
Described Double-Direction User link adopts the frequency range of 260MHz in Ku extended frequency band, is divided into the frequency band of 4 65MHz bandwidth; Adopt multibeam satellite antenna to form 140 cellular cells, these cellular cells are further subdivided into 140/4=35 community family, the frequency band of different 65MHz bandwidth is respectively used in 4 cellular cells in each community family, thereby make the frequency resource of 260MHz bandwidth can realize the space division multiplexing of 35 times, total resources can reach 9.1GHz.
1.1, user uplink link: in the Ku frequency range user uplink link of 140 wave beams, each wave beam is by the subband signal of 26 2.5MHz bandwidth of transmission of a 65MHz bandwidth, these 26 sub-band channel adopt MF-TDMA (multiband-time division multiple access) mode to realize multiple access access, with 10 milliseconds, (are T f=10) be the frame period, every frame is divided into 8 time slots, according to signaling by each time slot allocation to different user transmission information.In each sub-band channel, the 1st time slot adopts SCDMA (slot synchronization code division multiple access) mode to realize multiple access access, for command transmitting information and scattered IP bag; The signal of these time slots carries out carrying out IP exchange after despreading, solution mediation decoding on star, and wherein signaling information is for the cocommutative control and management of star, and scattered IP bag is directly delivered to corresponding described user's downlink transmission.
Each mobile subscriber terminal 3 is applied for allocated channel by signaling to network center, can apply for a plurality of tdma slots simultaneously, to send the signal of higher information rate, for example, when application is in certain subband during 7 time slots, the information rate sending can reach about 2.8Mbps.Each mobile subscriber terminal 3 can also apply for that the sub-band channel of a plurality of 2.5MHz bandwidth sends the information of higher rate, for example: apply for 10 sub-band channel, the information rate sending can reach 28Mbps left and right simultaneously.
1.2, user's down link: in the Ku frequency range user down link of 140 wave beams, each wave beam passes through the channel of a 65MHz bandwidth with IP-over-DVB-S form transmission broadband IP data message, this is a kind of transmission means of single carrier Digital Modulation, adopt 16-APSK and in conjunction with the error correction coding of 3/4 code check, the clean information rate that described user's down link of every 65MHz bandwidth can transmit can reach 155.52Mbps, and corresponding hair speed is 200Mbps left and right.
1.3, data throughput estimation: because above-mentioned mobile subscriber's link analysis situation is known, the speed of described user's down link is with more much higher than the speed of its user uplink link, the ratio of the two speed can reach (5～389) ︰ 1 left and right, here 155.52/0.4 ≈ 389,155.52/28 ≈ 5.Such asymmetrical design, for supporting that interconnecting application is very rational.In fact, it has implied the support for television broadcasting, demand (telecommunication) service.
The second, the method for synchronization: it is benchmark that the whole wide-band mobile communication system based on multi-beam GEO satellite be take the frame synchronization clock of issuing on star, take the frame period as T fthe frame synchronization mode of=10 milliseconds is worked, and each mobile subscriber terminal 3 is synchronous by the synchronous error information realization closed loop that detects on star and issue.26 sub-band channel of 140 user link wave beams adopt MF-TDMA or SCDMA mode to realize multiple access access, all adopt the synchronous transmission of closed loop method of synchronization achieve frame and time slot, be on star, to detect the synchronous head that each user sends at each frequency band, each time slot to arrive the time synchronized deviate on star, and be digital modulation signals by these synchronism deviation Data Modulations, by corresponding described user's down link, directly (needn't send to each mobile subscriber terminal 3 through the 1-2 of 1-1Huo juncture station of the network control center.Described mobile subscriber terminal 3 is adjusted its transmission delay after receiving synchronous error value, and the synchronous error on the synchronous head signal arrival star that makes to send next time reduces, thereby it is synchronous to realize closed loop.
Three, two-way frequency planning and the performance evaluation that is fed to link between satellite equipment 2 and the 1-2 of 1-1Huo juncture station of the network control center:
Because total speed of up link in Double-Direction User link and down link is different, the speed of the described two-way uplink and downlink that are fed to link of satellite equipment 2 and the 1-2 of 1-1Huo juncture station of the network control center 9 is different, and transmission means is also different.
3.1, the frequency planning of lower line feed link and performance characteristics:
Article 9, described lower line feed link, the base band complex envelope signal of all user's transmitted signals that need to be 9.1GHz by total bandwidth considers that by being fed to the 1-2 of 1-1Huo juncture station of the network control center on star channel multiplexing has certain expense, and every link approximately needs the frequency resource of 1.25GHz.Adopt Ka frequency range spot beam transmission can carry out 9 space division multiplexings, therefore altogether only need take the frequency resource of 1.25GHz.Each described lower line feed link all adopts MF-QOTDM transmission method to transmit, and the total bandwidth that is about to 1.25GHz is divided into 16 wide frequency bands, QOTDM signal being formed by 26 base band complex envelope signal multiplexings of each frequency band transmission.
Described lower line feed link transmits the synchronizing sequence in QOTDM signal, adopt the pseudo-random code sequence of portability information, in direct sequence spread spectrum mode, carry network management information and transmit, the return link that also can be doubled as network management star IP network is used.
3.2, the frequency planning of upper line feed link and performance characteristics:
Bandwidth mobile subscriber's link of considering 140 described user link wave beams all adopts 16APSK modulation, the about 200Mbps of hair speed that the 65MHz bandwidth of every described user uplink link can be transmitted, it is 28Gbps that 140 described user uplink links amount to hair speed.Therefore 9 required total speed of described upper line feed link that are fed to these data are about 28Gbps, if adopt QPSK modulation transmissions required bandwidth be about 18GHz.Consider to adopt 9 times of space division multiplexings, required frequency resource is about 2GHz; Allow some leeway, be taken as 2.25GHz bandwidth.
Adopt QPSK modulation, the hair speed of every described upper line feed link transmission 2.25GHz bandwidth is about 3.375Gbps; If adopt the channel error correction coding of 3/4 code check, net rate is 2.53125Gbps.Adopt the frequency division multiplexing transmission of 4 frequency bands, each frequency band is according to the STM4 form transmission of SDH agreement, i.e. speed 622.08Mbps, and total speed is 2.48832Mbps, obviously 2.25GHz bandwidth can meet the requirement of this transmission.
The data of transmitting in described upper line feed link, based on IP-over-SDH mode, wherein can comprise the IP packet for network management.That is to say, the star IP network that this link can be network enabled management control system provides a part of information transfer channel.
In the present embodiment, the update cycle of the switching and routing table of described programme-controlled exchange module 2-1, be taken as frame period T f5 times, 50 milliseconds.
During actual use, can be according to specific needs, the update cycle of switching and routing table is adjusted accordingly.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every any simple modification of above embodiment being done according to the technology of the present invention essence, change and equivalent structure change, and all still belong in the protection range of technical solution of the present invention.

Claims (10)

1. the wide-band mobile communication method based on multi-beam GEO satellite, is characterized in that: be positioned between on-board equipment (2) on GEO satellite and earth station equipment by (N g+ 1) bar is two-way is fed to link bidirectional communication, and on-board equipment (2) and N tindividual mobile subscriber terminal passes through N between (3) bbar Double-Direction User link carries out two-way communication; N g, N tand N bbe positive integer, N g>=2, N b=69～200; Described earth station equipment comprises the Yi Ge network control center (1-1) and N gindividual juncture station (1-2); The described two-way link that is fed to comprises line feed link and lower line feed link, (N g+ 1) described in bar, the two-way link that is fed to all adopts Ka frequency range spot beam to carry out transfer of data, and realizes (N g+ 1) inferior space division multiplexing; Described Double-Direction User link comprises user uplink link and user's down link, N bdescribed in bar, Double-Direction User link all adopts user link wave beam to carry out transfer of data, and described user link wave beam is X band beam, Ku band beam or Ka band beam;
Described on-board equipment (2) and N tindividual described mobile subscriber terminal (3) adopts the cellular network being formed by satellite antenna wave beam to carry out bidirectional data transfers, the bandwidth of frequency band that described cellular network adopts is that 260MHz and this frequency band division are the sub-band of 4 65MHz bandwidth, and the frequency of 4 described sub-bands is all not identical; Described cellular network is divided into N altogether bindividual cellular cell, described in each, cellular cell is all corresponding to N ba Double-Direction User link described in bar in Double-Direction User link, every 4 adjacent cellular cells form Yi Ge community family, N bindividual described cellular cell belongs to N b/ 4 community families, all comprise 4 described cellular cells in the family of community described in each, and described in each, 4 described cellular cells in the family of community adopt respectively 4 described sub-bands to carry out transfer of data, thereby make the frequency resource of 260MHz bandwidth realize N b/ 4 space division multiplexings; N beach user uplink link in individual described user's two-way link is the subband signal of 26 the 2.5MHz bandwidth of transmission by a 65MHz bandwidth all, described subband signal is the signal that mobile subscriber terminal (3) need be sent to on-board equipment (2), the channel of 65MHz bandwidth is divided into 26 sub-band channel of transmitting for 26 described subband signals respectively, and described in each, user uplink link all comprises 26 described sub-band channel; Each sub-band channel is with T fin the frame period of millisecond, every frame is divided into N sindividual time slot carries out communication, wherein T f=5～20, N s=8～16; N bevery user's down link in individual described user's two-way link is respectively by the channel transmission data of a 65MHz bandwidth; N tindividual described mobile subscriber terminal (3) shares N bdescribed in bar, Double-Direction User link carries out transfer of data, N t=(N s-1) * 26 * N b;
The data transmission procedure of described user uplink link is as follows:
Step 101, signal are uploaded: (the N in each cellular cell s-1) * 26 mobile subscriber terminals (3) with MF-TDMA mode transmitted signal, are sent to on-board equipment (2) by described user uplink link; The signal that mobile subscriber terminal (3) transmitted signal is IP traffic;
Signal tap and processing on step 102, star: described on-board equipment (2) in MF-TDMA mode to every (N that user uplink link is transmitted in step 101 s-1) * 26 subscriber signals carry out frequency division tap and time-division tap processing; In every frame except the signal of the 1st time slot, all the other (N s-1) signal of individual time slot is all sent into programme-controlled exchange module (2-1) and is carried out programme-controlled exchange;
In every frame, the signal of the 1st time slot accesses with Synchronous-Code Division Multiple Access, and is in harmonious proportion after decoding through despreading, solution, sends into ip router (2-2) and carries out IP exchange;
The data transmission procedure of described user's down link is as follows:
Data transaction and modulation on step 201, star: the IP traffic that the need of ip router (2-2) output is sent to mobile subscriber terminal (3) is changed the data flow that forms IP-over-DVB-S form, then carries out Digital Modulation;
Step 202, signal pass down: Digital Modulation gained signal in step 201 is sent to corresponding mobile subscriber terminal (3) by described user's down link; The bandwidth of the corresponding described user's down link in each cellular cell is 65MHz;
The data transmission procedure of described upper line feed link is as follows:
Step 301, signal are uploaded: by described upper line feed link, the information that the network control center (1-1) or juncture station (1-2) are sent is sent to on-board equipment (2) with IP-over-SDH form; The total bandwidth of every described upper line feed link is W umHz, W u=65 * N b/ [(N g+ 1) η], the wherein band efficiency of the ηWei network control center (1-1) or juncture station (1-2) digital modulation mode used and the ratio of the band efficiency of user's down link digital modulation mode used;
On step 302, star, signal receives and processes: described on-board equipment (2) receives after the signal that the step 301Zhong network control center (1-1) or juncture station (1-2) transmit, first carry out demodulation and decoding, then send into ip router (2-2) and carry out IP exchange;
The data transmission procedure of described lower line feed link is as follows:
The multiple connection of multiple signals and modulation on step 401, star: the base band complex envelope signal that the need of programme-controlled exchange module (2-1) output is sent to a plurality of users of earth station equipment (1), and the need of ip router (2-2) output are sent to the IP traffic of earth station equipment (1) through the base band complex envelope signal of Digital Modulation gained, carry out after MF-QOTDM multiple connection, then carry out multi-carrier modulation; Every described lower line feed link is modulated to N b/ (N g+ 1) the QOTDM signal of individual carrier modulation, each QOTDM signal forms by the base band complex envelope signal multiplexing of 26 2.5MHz bandwidth, and the bandwidth of each QOTDM signal is 65MHz, wherein in each base band complex envelope signal, contains (N s-1) individual MF-TDMA signal;
Wherein, MF-QOTDM is multiband QOTDM, and MF-QOTDM transmission method is multiband QOTDM transmission method, disclosed quasi OTDM transmitting method in the application for a patent for invention that described QOTDM transmission method is notification number CN1845487B; While carrying out MF-QOTDM multiple connection, the multiple connection method adopting is multiple connection method used in described QOTDM transmission method;
Under step 402, signal, pass and reception & disposal: by described lower line feed link, multiple connection in step 401 and modulation gained signal are sent to the corresponding network control center (1-1) or juncture station (1-2); Then, carry out multicarrier solution mediation QOTDM tap and process in the network control center (1-1) or juncture station (1-2), every described lower line feed link carries out N b/ (N g+ 1) individual carrier wave demodulation, each carrier wave demodulation result is carried out QOTDM tap again, respectively obtains 26 base band complex envelope signals; Each base band complex envelope signal carries out time-division tap again, respectively obtains 8 complex baseband signals; Again gained complex baseband signal is carried out respectively to demodulation coding.
2. according to the wide-band mobile communication method based on multi-beam GEO satellite claimed in claim 1, it is characterized in that: N tit is synchronous that the time synchronized deviate that individual described mobile subscriber terminal (3) all detects according to on-board equipment (2) is carried out closed loop, and described in each user uplink link by the synchronous transmission of the synchronous achieve frame of closed loop and time slot, carry out closed loop when synchronous, described on-board equipment (2) detects each mobile subscriber terminal (3) and at the synchronous head of each frequency band and each time slot signal transmitted, arrives the time synchronized deviate of on-board equipment (2), and after being modulated to digital modulation signals, this time synchronized deviate is sent to corresponding mobile subscriber terminal (3) by described user's down link, this mobile subscriber terminal (3) receives after described digital modulation signals, according to the synchronism deviation value size receiving, adjust its transmission delay, the synchronism deviation of the synchronous head arrival on-board equipment (2) of next transmitted signal is reduced, thereby it is synchronous to realize closed loop.
3. according to the wide-band mobile communication method based on multi-beam GEO satellite described in claim 1 or 2, it is characterized in that: the signal that the need that by described upper line feed link, the network control center (1-1) or juncture station (1-2) sent in step 301 are uploaded to GEO satellite is sent to on-board equipment (2) before, and the division of signal that first need is uploaded to GEO satellite is N sgroup; Every group of signal is all adapted for the link signal form of SDH host-host protocol, then carries out chnnel coding and become the bit stream of 320Mbps with 1/2 code check, is modulated into the signal that bandwidth is 200MHz afterwards through QPSK; When the signal that need is uploaded to GEO satellite by described upper line feed link is sent to on-board equipment (2), N sthe signal of individual 200MHz bandwidth carries out uplink in the channel of Ka frequency range spot beam in frequency division multiplexing mode; On-board equipment described in step 302 (2) receives N safter the signal of individual 200MHz bandwidth, first received signal is carried out along separate routes, separates mediation decoding, then send into ip router (2-2) and carry out IP exchange.
4. according to the wide-band mobile communication method based on multi-beam GEO satellite described in claim 1 or 2, it is characterized in that: while carrying out transfer of data by described lower line feed link in step 402, adopt MF-QOTDM transmission method to carry out transfer of data, synchronizing sequence adopts pseudo noise code and its to double as spreading code and uses, and this spreading code is for being sent to the need of ip router (2-2) output the IP data spread spectrum of earth station equipment and being transferred to the corresponding network control center (1-1) or juncture station (1-2).
5. according to the wide-band mobile communication method based on multi-beam GEO satellite described in claim 1 or 2, it is characterized in that: when in step 102, in every frame, the signal of the 1st time slot accesses with Synchronous-Code Division Multiple Access, adopt the channel competition mechanism of carrier sense, with Synchronous-Code Division Multiple Access, send scattered IP packet, comprise signaling information and HTTP service note breath; Again the signal of described scattered IP packet is carried out despreading, separated after mediation decoding, send into ip router (2-2) and carry out IP exchange, after IP exchange, deliver to respectively OAMAgent module (2-4) on corresponding user's down link, lower line feed link or star.
6. according to the wide-band mobile communication method based on multi-beam GEO satellite described in claim 1 or 2, it is characterized in that: on-board equipment in step 102 (2) in MF-TDMA mode to every (N that user uplink link is transmitted in step 101 s-1) * 26 subscriber signals carry out frequency division tap and time-division tap while processing, first by quadrature frequency conversion module (2-10), received signal is carried out to quadrature frequency conversion and be converted to complex baseband signal, by frequency division Demultiplexing module (2-5), carry out frequency division tap again, by time-division Demultiplexing module (2-6), carry out time-division tap again, then send into programme-controlled exchange module (2-1) and exchange; While carrying out the multiple connection of multiple signals on star in step 401, adopt MF-QOTDM multiple connection module (2-7) to carry out multiple connection; The N of the module of programme-controlled exchange described in step 102 (2-1) bindividual input port respectively with the joining for exporting the data output interface of base band complex envelope signal sampling point sequence of time-division Demultiplexing module (2-6), (N of programme-controlled exchange module (2-1) g+ 1) individual output port respectively with (N g+ 1) Data Input Interface of individual MF-QOTDM multiple connection module (2-7) joins; The granularity of described programme-controlled exchange module (2-1) exchange is the sampling point sequence data of a time slot in a bandwidth described base band complex envelope signal that is 2.5MHz; When programme-controlled exchange module (2-1) is carried out programme-controlled exchange, according to the switching and routing table of being set up by described signaling information, by N bthe sampling point sequence data that individual input port is sent into is transferred to respectively corresponding output port; The update cycle of described switching and routing table is (N f* T f) millisecond, wherein N ffor positive integer and N f=1～20.
7. according to the wide-band mobile communication method based on multi-beam GEO satellite claimed in claim 6, it is characterized in that: while carrying out frequency division tap in step 102, the frequency division Demultiplexing module of employing based on 32 FFT is 26 base band complex envelope signals by received signal tap, use again time-division Demultiplexing module (2-6) to carry out respectively time-division tap to each the base band complex envelope signal in resulting 26 base band complex envelope signals, after each base band complex envelope signal time-division tap, all obtain the signal of 8 time slots, realized the time-division tap of MF-TDMA mode.
8. according to the wide-band mobile communication method based on multi-beam GEO satellite described in claim 1 or 2, it is characterized in that: the information content that transmits signal by described lower line feed link in step 402 is IP packet, the described network control center (1-1) or juncture station (1-2) receive after the signal transmitting by described lower line feed link, first carry out shunt, separate mediation decoding, then the IP packet that wherein belongs to local internet is sent into local router and carry out IP exchange; And will pass through the IP packet that on-board equipment (2) is sent to mobile subscriber terminal (3), first by described upper line feed link, be sent to on-board equipment (2), then be sent to corresponding mobile subscriber terminal (3) by described user's down link.
9. realize a system for wide-band mobile communication method as claimed in claim 1, it is characterized in that: comprise the on-board equipment (2) being laid on GEO satellite, the earth station equipment and the N that are laid in ground and carry out two-way communication with on-board equipment (2) tindividual N tthe mobile subscriber terminal (3) of two-way communication is carried out in the individual relay transmission effect by on-board equipment (2), and described earth station equipment comprises the Yi Ge network control center (1-1) and N gindividual juncture station (1-2), N gfor positive integer and N g>=2;
Described on-board equipment (2) comprises ip router (2-2), programme-controlled exchange module (2-1), N bindividual data conversion module (2-14), can produce N bthe first multi-beam dual-mode antenna (2-8) of individual described user link wave beam, can produce (N g+ 1) the second multi-beam dual-mode antenna (2-11) of individual described Ka frequency range spot beam, the first signal Transmit-Receive Unit (2-9) joining with the first multi-beam dual-mode antenna (2-8) and the secondary signal Transmit-Receive Unit (2-12) joining with the second multi-beam dual-mode antenna (2-11), the N that described secondary signal Transmit-Receive Unit (2-12) receives bindividual signal is sent into programme-controlled exchange module (2-1) respectively after quadrature frequency conversion module (2-10), frequency division Demultiplexing module (2-5) and time-division Demultiplexing module (2-6); The quantity of described quadrature frequency conversion module (2-10), frequency division Demultiplexing module (2-5) and time-division Demultiplexing module (2-6) is N bindividual, N bindividual described time-division Demultiplexing module (2-6) for the data output interface of exporting base band complex envelope signal sampling point sequence respectively with the N of programme-controlled exchange module (2-1) bindividual input port joins; (the N of described programme-controlled exchange module (2-1) g+ 1) individual output port respectively with (N g+ 1) input interface of individual MF-QOTDM multiple connection module (2-7) joins, (N g+ 1) output port of individual MF-QOTDM multiple connection module (2-7) respectively with (N g+ 1) individual described secondary signal Transmit-Receive Unit (2-12) joins;
N bindividual described time-division Demultiplexing module (2-6) for exporting the data-out port of the 1st time slot signal, all join with the data-in port of SCDMA access module (2-13); On the signaling information output port of SCDMA access module (2-13) and star, the signaling information input port of OAMAgent module (2-4) joins, and on described star, OAMAgent module (2-4) is joined with programme-controlled exchange module (2-1);
The IP packet output port of described SCDMA access module (2-13) and ip router (2-2) join, and on described star, the IP data input/output interface of OAMAgent module (2-4) and ip router (2-2) join; (N g+ 1) the IP data-in port of individual described MF-QOTDM multiple connection module (2-7) all joins with ip router (2-2), N bthe IP data-in port of individual described data conversion module (2-14) all joins with ip router (2-2), N bthe output port of individual described data conversion module (2-14) respectively with N bindividual the first modulation module (1-15) joins, N bindividual described the first modulation module (1-15) all joins with first signal Transmit-Receive Unit (2-9);
The IP data output interface of described secondary signal Transmit-Receive Unit (2-12) and ip router (2-2) join; (N g+ 1) output port of individual described MF-QOTDM multiple connection module (2-7) respectively with (N g+ 1) individual the second modulation module (1-16) joins, (N g+ 1) individual described the second modulation module (1-16) all joins with secondary signal Transmit-Receive Unit (2-12).
10. according to system claimed in claim 9, it is characterized in that: OAMAgent module (2-4), N on the described network control center (1-1), star gnetwork management information interface unit and the N of individual described juncture station (1-2) tthe webmaster performance element of individual described mobile subscriber terminal (3) forms network management control system, described network management control system forms a star IP network, the Centroid of described star IP network is the network control center (1-1), OAMAgent module (2-4), N on described star gdescribed network management information interface unit and the N of individual described juncture station (1-2) tthe described webmaster performance element of individual described mobile subscriber terminal (3) is the terminal node of described star IP network.
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