CN1336044A - Multi-transmitter system - Google Patents

Multi-transmitter system Download PDF

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Publication number
CN1336044A
CN1336044A CN 99816343 CN99816343A CN1336044A CN 1336044 A CN1336044 A CN 1336044A CN 99816343 CN99816343 CN 99816343 CN 99816343 A CN99816343 A CN 99816343A CN 1336044 A CN1336044 A CN 1336044A
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China
Prior art keywords
antenna
carrier
signal
radio
switch
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J·K·厄斯特林
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transmitters (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

A radio transceiver station avoids the problems of prior devices that either do not use multi-beam antennas or use multi-carrier power amplifiers, permitting signals from several transceivers to be selectively directed to one antenna lobe with low loss. The radio transceiver station includes an antenna system having a plurality of beams, a plurality of radio transmitters, each radio transmitter including a base band part and a radio frequency part having a single-carrier radio frequency power amplifier, a plurality of filters that are respectively connected to the plurality of radio transmitters and that are tunable to respective carrier signals generated by respective radio transmitters, and a switch matrix for connecting selected ones of the filters to the antenna system such that carrier signals generated by the transmitters and amplified by the single-carrier radio frequency power amplifiers can be radiated through selected beams. Each transmitter can be connected to each antenna beam independently of each other transmitter.

Description

Multi-transmitter system
Background
The present invention relates generally to telecommunications, be specifically related to cellular radio Communication.
Resemble the such Modern Communication System of honeycomb and satellite radiotelephone system, adopt various operational modes (simulation, numeral and mixing) and access technology, insert the mixing of (CDMA) and these three kinds of technology as frequency division multiple access access (FDMA), time division multiple access access (TDMA), code division multiple access.
In the North America, will use the digital cellular radiotelephone systems of TDMA to be called Digital Advanced Mobile Phone Service (D-AMPS), its some feature is described in detail in the TIA/EIA/IS-136 standard of Telecommunications Industries Association and electron trade association (TIA/EIA) publication.Describe the digital communication system that another uses direct sequence CDMA in the TIA/EIA/IS-95 standard in detail, describe the frequency hopping cdma communication system in detail in the EIASP3389 standard (PCS1900).The PCS1900 standard is a kind of realization of global system for mobile communications (GSM) general outside the North America, and this system is introduced into the North America and is used for Personal Communications Services (PCS) system.
In these communication systems, realize by near the warbled wireless carrier signal of frequency 800 megahertzes (MHz), 900MHz, 1800MHz and/or 1900MHz.At tdma system even to some extent in cdma system, each wireless channel is divided into a series of time slots, and each time slot wherein contains a user's block of information.These time slots are grouped into continuous frame, and each frame has a scheduled duration, and these continuous frames are grouped into the continuous frame that is commonly referred to as superframe.How the kind (as TDMA or CDMA) of the access technology that communication system is used expresses on time slot and frame if influencing user profile, but present access technology is all used a kind of time slot/frame structure.
Set up the effort of better antenna system is more and more noted for these cellular radio Communication systems.Particularly, many lobes antenna is mentioned as the revolution next time of plot planning continually, uses the example of the system of this antenna to develop at gsm system and wideband CDMA system.Use some reasons of many lobes antenna from following discussion, to become obvious.
Fig. 1 represents an example of traditional cellular radio Communication system 100, and it comprises a plurality of wireless base stations (RBS) 170a-170n that is connected to a plurality of corresponding antenna 130a-130n.The wireless coverage of RBS/ combination of antennas is represented by corresponding sub-district 110a-110n, only for simplicity, represents these sub-districts with hexagon.RBS 170a-170n is together with antenna 130a-130n and a plurality of remote terminal (RT) 120a-120m (for example, travelling carriage) communication that is arranged in sub-district 110a-110n.Be used for being commonly referred to as down link, and be used for the so-called up link of communication link that transmits a signal to a RBS from a RT from the communication link that a RBS transmits a signal to a RT.
RBS 170a-170n is connected to MTSO (MTSO) 150, and its wherein a kind of task is to coordinate the activity of RBS, as switching to another the process from a RBS or sub-district at communication link.MTSO can be connected to another communication network, and as public switched telephone network 160, it is user's service by the various communication equipments of similar phone 180a, computer 180b and facsimile machine 180c.
Fig. 2 has provided the communication system of a typical GSM type.Each RBS170 typically handles a plurality of controls and Traffic Channel, and they come voice-over, fax, video and out of Memory by a plurality of transceivers (TRX) 172 that monitored by controller 174.Each TRX 172 can regard as a baseband portion 176, it is used for for down link from base station controller (BSC) 140 receiving information signal frames, and a radio frequency (RF) part 178, its partial information signal frame (as a time slot or a plurality of time slot) that properly uses is modulated the RF carrier signal.Shown in the demonstration cellular system of Fig. 2 be a RT120 in addition, it comprises be used for the transceiver 122 of communicating by letter with RBS on professional and control channel, and a processor 124 that is used for controlling the operation of this RT.
TRX sends and received signals by antenna 130, just for convenience of explanation for the purpose of, this antenna is illustrated as being connected to independently independent TRX.Because gsm system can use different carrier for the different piece in each information signal frame of the specific RT that leads (for example time slot or pulse train),, the RF of each TRX jumps so partly realizing carrier frequency.The BSC that typically controls a plurality of RBS " knows " to be had and distributes a plurality of carrier waves (for example 8) to give each TRX for what TRX among each RBS.Like this, information signal frame that is received from MTSO150 by BSC or pulse train can be directed on the specific T RX172 among the specific RBS 170 based on being included in information unit the signal frame; Remaining then handle the distribution of these frames and carrier jumping frequency time slot to suitable TRX by RBS.Each baseband portion 176 comprises the information processing device that inspection receives from BSC, and indicates based on the carrier wave of each time slot expectation, and appropriate baseband portion is sent to its relevant RF part 178 to be transferred to specific RT with gap information.
The TRX of handling control channel is broadcast to the RT that is locked in this control channel with control messages (for example being used for synchronously their transceiver to the synchronization message of frame/time slot/bit architecture of RBS by the calling of RBS and RT exchange-or session-set up message with by RT).Should be appreciated that TRX172 can be used as is used for sharing the control of same carrier wave signal and the single equipment of Traffic Channel is realized.
Down link in the given sub-district can reduce quality because of the signal that other RBS or transmitter sent that operates in same frequency band.A frequency reuse scheme alleviates this interference by potential interfered cell is located each other as far as possible far.Through-put power control uses the required least energy of proper communication also can reduce this interference by guaranteeing transmitter.
By using the terminal communication in a plurality of narrow beam antennas and the sub-district, also can further reduce this interference.A corresponding limited geographic area switching signal in narrow beam antenna and the sub-district, thus the interference that terminal suffered beyond this zone reduced.Current communication system typically is divided into three 120 ° of sectors, each sector wherein is by a corresponding antenna service in three fan antennas, perhaps be divided into six 60 ° of sectors, each sector wherein is by a corresponding service in six fan antennas.Should be appreciated that and to realize even littler " sector " with the phased array antenna of the narrow beam that a plurality of fixing or independent manipulation are arranged.
For example, Fig. 3 represents a sub-district in the communication system 200, and this system has one of use to have a plurality of narrow beam (B 1, B 2, B 3, B 4Deng) the RBS 220 of antenna (not shown), these narrow beams are radial and extend out from RBS 220.Preferably, wave beam is overlapping to cover this sub-district fully.Although not shown, antenna comprises three independently phase array fan antennas, and wherein each is communicated by letter with 120 ° of areas that extend out from RBS 220.Fig. 3 also represents to be positioned at wave beam B 1Interior RT210, and use this wave beam B 1Perhaps may also use one or more adjacent beams between RBS 220 and terminal 210, to proceed communication.
In this communication system, can on specific direction, optionally send and received signal by narrow beam (high-gain) antenna, reduce the interference that terminal suffered.This has caused the make an uproar raising of (C/I) ratio and the increase of power system capacity of carrying in the communication link.For example, Applications of CDMA in Wireless/Personal Communications (application of the CDMA in wireless/personal communication) as people such as Garg, described on the 332-334 page or leaf among the Prentice Hall (1997), divide sector scheme for some sub-district, idealized eight beam antenna can provide three times of raisings on the capacity.
Usually, use lobe antenna more than to mean for application resemble RBS in cell phone system and will use at least one Multi-Carrier Power Amplifier (MCPA), this amplifier is the equipment that is used for amplifying a RF signal that is made of a plurality of different carrier signals.From Fig. 4 A and 4B, be appreciated that two kinds of methods at the RBS that uses MCPA.
Fig. 4 A represents to reflect the RBS that is known as the MCR/MCPA method.By the predetermined digital signal (being digital to analogy (D/A) conversion signal before) of a plurality of Base Band Unit generations, by public addition of wide dynamic range D/A switch and processing to the same antenna wave beam.Shown in Fig. 4 A, by digital signal addition in multi-carrier-wave wireless equipment (MCR) 1 and MCR2 of baseband portion 1,2,3 generations.Title " multi-carrier-wave wireless equipment " or MCR come from such fact, that is: be public such as the such analog component of modulator, filter and RF amplifier for merged signal.Usually by the MCPA among Fig. 4 A the consequential signal that is produced by each MCR is amplified then.Each Base Band Unit is selected the antenna beam of transmission thereon, and sends its digital signal to corresponding M CR.Because a plurality of Base Band Unit can send on identical antenna beam simultaneously, so wireless device and power amplifier must be multicarriers, for each antenna shown in Fig. 4 A a MCR and a MCPA are arranged.
Fig. 4 B represents to reflect the RBS that is known as the SCR/MCPA method.Not to resemble in the MCR/MCPA method at base-band digital ground combined signal, but each Base Band Unit by an independent wireless device (thereby gain the name " the single carrier wireless device " or SCR) handle, and merge and switch independent modulated carrier signal with low RF power.Finally be amplified to the power level needs that are fit to transmission and a MCPA arranged for each antenna beam.In the method, use mixing combiner switches and merges usually, because their loss is acceptable, because they appear at before the final amplification.
But, along with antenna beam quantity and the increase of wanting merged number of signals, the complexity and the physical size of switching and merging network also can increase.In fact, there is the system of eight Base Band Unit and eight antenna lobes to have 64 RF switches and 56 mixing combiners.People's such as Searle European patent open source literature EP 0593822 has described the antenna for base station equipment that the antenna for base station of a plurality of antenna arrays equipment, wave beam forming device and transceiver are arranged, this antenna for base station equipment have one by the wave beam forming device with one or another switch matrix that is connected in each transceiver and the antenna array.This system uses a plurality of mixing combiners and a Multi-Carrier Power Amplifier.Describe another system in the U.S. Patent No. 5,048,116 of Schaeffer, wherein described a kind of signal routing systems that uses with eight transmitters and a plurality of frequency response equipment.The equipment of Schaeffer needs a large amount of, 64 this frequency response equipment, thus make that system is huge physically and be not easy to enlarge.The European patent open source literature EP 0439939 of Davis has described the signal divider/combiner of a division/merging antenna between a plurality of transceivers.This division device/combiner array comprises a plurality of controllable switches.
Wish that RBS is compatible mutually with other parts of at present typical cellular communication system, and do not need minimum modification is made an amendment or only made to those parts.An aspect of this compatibility is that RBS should not require any modification of system to determine to use which transceiver to communicate by letter with a remote terminal.From the viewpoint of BSC or MTSO, RBS should be similar basically like this.If BSC will not know the internal structure of RBS, then each transceiver among the RBS must be communicated by letter with each remote terminal in the sub-district.Equally, all remote terminals in the sub-district may be in same area, and promptly in same antenna lobe, thereby each transceiver must send in each antenna lobe.
Although the system of describing in the system that Fig. 4 is A, describe among the 4B and the above-cited file can be connected to different transceivers different antenna lobes, still there are many shortcomings in these systems.An important exemplary shortcomings is to hold a large amount of switches and mix the needed physical size of combiner.Another significant drawbacks is the poor efficiency relatively that is compared to the Multi-Carrier Power Amplifier of single carrier power amplifier (SCPA).In fact, the typical electrical efficient of multicarrier RF power amplifier may (for example approximately have only 3 percent, import the RF power output that a hectowatt electrical power can only obtain three watts), this is markedly inferior to about typical electrical efficient of 30 percent of single carrier power amplifier (SCPA).
It is also important that loss may be greater than 10dB by switching and merge the loss of network.Have than the antenna that is generally used for the higher gain of antenna in the cellular system by use, can recover the part of this loss, but still still have only pitiful link budget for this system usually.In some environment, as the high density network of sub-district on the geography, this can accept, but usually, expectation uses lobe antenna system more than to allow the sub-district of some greatly.
General introduction
The expectation with other parts compatibility of typical cellular communication system for RBS is satisfied in the applicant's invention, and can easily realize in current RBS, as RBS 2000 families of obtainable equipment among the wireless system AB of Ericsson.In addition, the applicant's invention also provides a kind of RBS, the problem that it has been avoided not using multi-beam antenna or has used the existing equipment of Multi-Carrier Power Amplifier.In a useful embodiment of the applicant's invention, from the signal of six transceivers antenna lobe that has only about 3.5-dB loss that can optionally be led.
An aspect according to the applicant's invention, a wireless receiving and dispatching letter platform comprises an antenna system that a plurality of wave beams are arranged, a plurality of radio receiving-transmitting units, each radio receiving-transmitting unit comprises a baseband portion and the radio frequency part that the single carrier radio-frequency power amplifier is arranged, a plurality of filters, they are connected respectively to these a plurality of transmitting sets and may be tuned on each carrier signal that is produced by separately transmitting set, and switch matrix, be used for selecteed those in the filter are connected to antenna system, thereby produce and the carrier signal of being amplified by the single carrier radio-frequency power amplifier can be by selecteed beam transmission by transmitter.Each transmitter can be independent of each other transmitter and be connected to each antenna beam.
In others of the present invention, according to switch-over control signal based on the information unit in the information signal frame that will be sent out, selecteed filter is connected to antenna system, and tunable filter comprises at least one tunable cavity and switch matrix comprises a plurality of p-i-n diodes.Wireless receiving and dispatching letter platform also comprises the signal bus between the baseband portion that is connected transmitting set, optionally the information signal frame is distributed to the radio frequency part of transmitting set.
The accompanying drawing summary
Fig. 1 represents a traditional cellular radio Communication system;
Fig. 2 represents a wireless base station and a remote terminal;
Fig. 3 represents to have the wireless base station of many lobes antenna;
Fig. 4 A, 4B are illustrated in the wireless base station and switch and two kinds of methods of combined signal;
Fig. 5 A, 5B represent the wireless base station according to the applicant's invention; And
Fig. 6 A, 6B represent the switch matrix according to the wireless base station of the applicant's invention.
Describe in detail
Though be in the environment of a cellular radio Communication system, to describe the application, be to be understood that this is an example, the present invention can be applied to other many environment.
Road as known can use and mix combiner or tunable cavity is realized merging a plurality of RF carrier signals and should be offered an antenna or antenna beam by merged signal.According to an aspect of the applicant's invention, be to use tunable cavity rather than mix combiner and realize what signal merged, because the expectation minimization loss is with maximum range.According to a further aspect in the invention, antenna lobe is selected after tunable cavity, according to another aspect, single carrier power amplifier (SCPA) can be used for transceiver.Can from describing, the detailed system shown in the general view shown in Fig. 5 A and Fig. 5 B see these aspects.
Fig. 5 A is discussed, a plurality of baseband portion 1,2 ..., the N SCR1 separately that feeds, 2 ..., N and SCPA1,2 ..., N.The high RF power output of SCPA is provided for switch and merges matrix to give suitable antenna or antenna beam with appropriate signal guide, has only provided wherein two in Fig. 5 A.Utilize high power RF signal to carry out owing to switch and merge, so can use SCPA rather than inefficient MCPA.Switching that an importance of the applicant's invention is a minimum losses and merging matrix.
Fig. 5 B represents to be coupled to the RF part 11-14 of four transceivers of tunable cavity TC11-TC14 separately.This RF part is corresponding to the SCR shown in Fig. 5 A.Other transceiver also can be provided, but for clarity sake, not shown in Fig. 5 B.The signal that is transmitted by tunable cavity is provided for switch matrix SM, for clarity sake, has only provided two part A, B among Fig. 5 B.Switch matrix will from selecteed those signal in the tunable cavity be connected in several antennas or the antenna lobe corresponding those.In Fig. 5 B, for clarity sake, two antenna ANT11, ANT12 have only been provided.The invention that should be appreciated that the applicant can realize in the system that more or fewer transceivers and/or antenna are arranged.
Tunable cavity TC can be traditional, selects for employed signal frequency is suitable.For some GSM cell phone system, carrier signal is separated at about 900MHz place with about 800KHz.Only need tunable cavity to have and be suitable for enough bandwidth that a carrier wave and another carrier wave are separated.The applicant has found that the isolation of about 10dB it seems just enough at present.If this resonant cavity is by slowly tuning, for example about several seconds, then this resonant cavity typically retuned to the carrier wave that is used by RBS.Because if RBS can change carrier wave quickly, i.e. about microsecond level (a time slot duration a section), then it will be more flexibly, so the expectation resonant cavity is tuning quickly, but this is optional.
An aspect according to the applicant's invention interconnects transceiver by a two-way signaling bus Xbus, the part of this bus distributed intelligence signal frame or those frames between transceiver.In the embodiment shown in Fig. 5 B, Xbus is placed between the baseband portion (not shown among Fig. 5 B) and RF part of transceiver.By this way, require to be provided for appropriate RF part and tunable cavity TC, and do not need dynamic tuning by the pulse train or the frame of a specific carriers transmission.The information that is distributed by Xbus preferably includes from the information signal frame of BSC and comprises the message that other is suitable, is used to one or more information units of the antenna lobe of pulse train or frame as sign.Based on well-known beam selection technology, Base Band Unit may be also " knows that " which antenna lobe is used for is communicated by letter with specific remote terminal, the information that the signal that the great majority in these remote terminals use the receiving unit by transceiver to receive from remote station is derived.
Should be appreciated that and can otherwise carry out the distribution of information signal frame or pulse train, and still within the applicant's invention scope.For example, do not need RBS to use the signal bus Xbus frame that distributes.In this embodiment, BSC offers a controller with frame, and this controller distributes frame or a part of frame to suitable transceiver (promptly giving suitable baseband portion).
Based on information signal frame and Xbus information, suitable RF partly makes switch matrix SM that its switch is set, so that signal can be sent out by selected antenna lobe.This arrangement make it possible to by base band rightly distributed intelligence carry out carrier frequency and jump, and this arrangement and current available RBS compatibility.
Switch matrix SM is set up, so that the switch-over control signal that appropriate antenna or antenna lobe can partly provide according to the RF of transceiver partly is connected with the RF of transceiver.Will be appreciated that, the switch-over control signal that partly produces by RF can be based on from the information signal frame that BSC arrives information and/or based on Xbus information.The particular form of these control signals is not strict; Only need their console switch matrix S M by rights.By the distribution of Xbus to signal, every transceiver is independent of this other class to the connection of antenna and connects by this way and set up.Although should be appreciated that the arrangement that Fig. 5 B has provided eight transceivers and eight antennas, the standalone upgrade easily of the quantity of transceiver and antenna.Should be appreciated that antenna or antenna beam in the system are many more, then each wave beam is just narrow more, and the physical size of base station is just big more.
Switch matrix SM preferably includes a plurality of p-i-n diode switches, and they connect in such a way, that is: according to the switch-over control signal from the RF part, allow any antenna lobe to be connected to any transceiver.By using the p-i-n diode as switch, can change fast for the selection of the antenna port of a transmitter, even on the basis of time slot (microsecond markers) one by one.But, should be appreciated that the equipment except that the p-i-n diode,, also can be used to switch matrix SM as transistor (as FET).
Fig. 6 A has provided switch A1, the A2 part as the A part of switch matrix SM, and switch B1, B2 are as the part of the B part of switch matrix SM.Fig. 6 A is based on such hypothesis, that is: tunable cavity TC has sufficiently high RF impedance on the frequency beyond the frequency that they will be tuned to.Under the situation of cut-off switch, all should there be high impedance (open circuit) at the two ends of switch.Switch is configured to make connection ground connection (short circuit), and the result is that this switch is not handled the high RF power from transceiver.Switch between antenna and the tunable cavity and conductor are preferably realized on an independent substrate, as a printed circuit board (pcb), with influence and the maximization performance that minimizes the conductor tolerance limit.
Make switch A1, A2 all be closed by its switch-over control signal is set, RF part 11,12 can all be connected to same antenna (the antenna A among Fig. 6 A), thereby makes it possible to by identical antenna or antenna lobe different carrier be transmitted simultaneously.Because cut-off switch B1, B2, and length is the conductor (wherein λ is the wavelength of RF signal in the conductor) of λ/2, by other path of switch matrix high impedance arranged.By Closing Switch A1, B2, transceiver T RX11 sends on antenna A separately, and transceiver T RX12 sends on antenna B separately.Should be pointed out that other combination of switching characteristic and conductor length can provide the function of identical type.
Fig. 6 B represents an embodiment, and it uses the conduct of p-i-n diode corresponding to the switch among the switch matrix SM of the more general structure shown in Fig. 6 A.For each pin diode a control signal is arranged, only provided wherein four among the figure, a positive control signal makes the p-i-n diode enter high RF impedance state, and a negative control signal makes the p-i-n diode enter a low RF impedance state.As shown in Figure 6A, (only provided wherein two (TC11, TC12)) among the figure is assumed to be on the frequency beyond the frequency that they are tuned to high RF impedance is arranged the turnable resonator cavity filter.Can see from the output of turnable resonator cavity filter, be counted as high RF impedance owing to the quarter-wave transformer makes the low RF impedance state of p-i-n diode.For will be from the RF signal guide antenna B of RF part 12, switch A2 should have a low RF impedance, and switch B2 should have a high RF impedance.If on same antenna, send more than a transmitter, then the turnable resonator cavity filter for they be tuned to frequency beyond frequency on high RF impedance make the RF signal in antenna, merge.RF part 12 transmits on antenna B if RF part 11 transmits on antenna A, and then switch B1 is set to low RF impedance, and its antenna port at antenna B is counted as high RF impedance.Therefore, enter antenna B from the signal of RF part 12, vice versa.
Can see that from Fig. 5 A, 5B, 6A and 6B there is an advantage in the applicant's system, promptly between power amplifier and antenna, have only about 3.5dB loss (for tunable cavity and filter 2.5dB, for each p-i-n diode switch+1dB).Have because the 5dB that the antenna gain (narrower wave beam) that increases causes improves, the applicant's system thereby provide than the much about 3dB of normal cellular system, emission effectively respectively to etc. penetrate power (EIRP).In addition, the applicant's invention makes except better C/I performance (promptly than the well about 5dB of traditional system) is arranged, also allow in most installation with frequency reuse coefficient 3, and may be with frequency reuse coefficient 1 in some is installed, and than the good 6dB of sensitivity of traditional base station.
Another remarkable advantage of the applicant's invention is that transceiver can use single carrier RF power amplifier, and this amplifier has much bigger energy and space efficiency than the multicarrier RF power amplifier that is used for other system.As mentioned above, the electrical efficiency of single carrier power amplifier (SCPA) is than big ten times of Multi-Carrier Power Amplifiers, make RBS can enough higher power or fewer electrical power consumed or these combination broadcast.
Those of ordinary skill in the art should be appreciated that under the situation that does not depart from inner characteristic of the present invention, can realize the present invention in other specific forms.Therefore, above-described embodiment should all be considered to illustrative rather than restrictive in all respects.The applicant's scope of invention is determined by following claim, and all modifications in this scope all is believed to comprise therein.

Claims (5)

1. a wireless receiving and dispatching is believed platform, comprising:
The antenna system that a plurality of wave beams are arranged;
A plurality of transmitting sets, each transmitting set comprise a baseband portion and the radio frequency part of single carrier radio-frequency power amplifier are arranged;
A plurality of filters are connected respectively to this a plurality of transmitting sets, and may be tuned to each carrier signal that is produced by separately transmitting set; And
A switch matrix is used for selecteed those in the filter are connected to antenna system, and the carrier signal that is produced by transmitter like this and amplified by the single carrier radio-frequency power amplifier can be by selecteed beam transmission;
Thereby each transceiver can be independent of each other transceiver and be connected to each antenna beam.
2. wireless receiving and dispatching letter platform as claimed in claim 1, wherein in response to the switch-over control signal based on information unit in the information signal frame that will send, selecteed filter is connected to antenna system.
3. wireless receiving and dispatching letter platform as claimed in claim 1, wherein tunable optic filter comprises at least one tunable cavity.
4. wireless receiving and dispatching letter platform as claimed in claim 1 also comprises the signal bus between the baseband portion that is connected transmitting set, optionally the information signal frame is distributed to the radio frequency part of transmitting set.
5. wireless receiving and dispatching letter platform as claimed in claim 1, wherein switch matrix comprises a plurality of p-i-n diodes.
CN 99816343 1998-12-23 1999-12-14 Multi-transmitter system Pending CN1336044A (en)

Applications Claiming Priority (2)

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US22026398A 1998-12-23 1998-12-23
US09/220,263 1998-12-23

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CN (1) CN1336044A (en)
AU (1) AU2133600A (en)
BR (1) BR9916517A (en)
CA (1) CA2356879A1 (en)
WO (1) WO2000039943A1 (en)

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