CN1411631A - CDMA communication system having highly selective filter - Google Patents
CDMA communication system having highly selective filter Download PDFInfo
- Publication number
- CN1411631A CN1411631A CN01804006A CN01804006A CN1411631A CN 1411631 A CN1411631 A CN 1411631A CN 01804006 A CN01804006 A CN 01804006A CN 01804006 A CN01804006 A CN 01804006A CN 1411631 A CN1411631 A CN 1411631A
- Authority
- CN
- China
- Prior art keywords
- communication
- highly selective
- signal
- filter
- selective filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
-
- 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
- H04B7/155—Ground-based stations
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Transceivers (AREA)
Abstract
A communication system includes a communication device and a base station in RF communication with the communication device in accordance with a code-based modulation scheme, such as W-CDMA. A highly selective filter is included in a receive path of the base station to improve performance in both uplink and downlink signals transmitted during the RF communication. The base station has an antenna for receiving the uplink signal, which is then provided to the highly selective filter for selection of a desired frequency band. A low-noise amplifier couples the highly selective filter to a demodulator responsive to signals modulated in accordance with the code-based modulation scheme. The demodulator is part of a data processing module to which the low-noise amplifier may be directly connected. The improved performance includes a reduction in power control messaging on the downlink signal, a reduction in a power level associated with the transmission of the uplink signal from the communication device, and an increase in both downlink and uplink capacity.
Description
Invention field
The present invention relates generally to wireless communication system, relate in particular to the system of the code-based modulation scheme of use such as CDMA.
Background of invention
Radio frequency (RF) receiver that is used for wireless communications station must provide high selectivity (ability of differentiating between the signal by the separation of small frequency difference) and sensitivity (receiving the ability of weak signal).In a typical base station, the RF signal of input at first removes signal component outside the frequency range of desired signal by low-loss RF band pass filter.Because the signal that produces after the filtering is all very weak usually, this signal can not introduced the amplifier (just, low noise amplifier or LNA) of much noise with regard to feed-in.
Because the radio telephone number of carriers in each district increases to adapt to the dramatic growth of user's request, the congested attention that causes high selectivity in the RF spectrum that is produced.In addition, designed new digital modulation device, utilized crowded RF spectrum to come increase capacity (just, the maximum quantity of each station, district concurrent user, or the throughput of one group of user's aggregate data) more fully such as code division multiple access (CDMA).These digital technologies provide the ability that tight security and senior PCS Personal Communications System (PCS) characteristic are provided to their user to wireless service providers.The use of digital system, for example CDMA technology needs wideer channel width effectively to turn round.For example, the bandwidth of each channel increase transfers to make that the distorted signals of avoiding relevant with shake with envelope delay is difficult more.When still providing high selectivity, universal filter will produce difficulty when being engaged in these challenges, influence service quality because higher selectivity will cause higher insertion loss.
Progress in the relevant recently superconductor technology causes having produced novel RF filter, i.e. high-temperature superconductor (HTS) filter.The HTS filter comprises the parts as the superconductor on the liquid nitrogen temperature of 77K.With regard to sensitivity and selectivity, such filter provides highly reinforcing performance than tradition (non-superconducting just) filter.Specifically, the HTS filter has demonstrated the inhibition that provides outstanding, and is littler than the loss of signal that may use conventional filter.These not higher insertion loss optionally improve allow radio telephone carrier waves increase each base station scope.As long as still within its capacity, the scope of increase will cause using the growth of minute (MOUs) in system.
Yet the acquisition of these improvement in performance is to be cost with system component more complicated in each RF receiver.Particularly, the HTS filter must have cooling system and guarantees that filter can maintain lower temperature (for example, approximately 90K or lower).
In order to keep equipment under such temperature, cooling system should comprise the Cryo Refrigerator of some types.Cryo Refrigerator comprises that the compressor that provides that is used to keep the supercharging refrigerant and heat exchanger or cold head take away the heat on the equipment that is cooling off.In addition, the HTS filter must by in cryogenic box the sealing chilled equipment make and environment between heat output reduce to minimum.Cryogenic box is often extracted all gaseous materials out and is reduced convective heat transfer.
Fig. 1 has shown that one has the primary antenna 10 that is connected to casing 14 and the prior art cdma base station of diversity antenna 12.Primary antenna 10 is designed to send near 800MHz (Cellular Networks) or 1.9GHz (PCS) and receive the RF signal, and diversity antenna 12 is devoted to the diversity reception passage of arbitrary wave band.Antenna 10 is connected with parts in being configured in box body wall 14 and with elementary receive path and sendaisle, and diversity antenna 12 and diversity reception passage link together, and this passage comprises generalized ribbon bandpass filter 16 and non-low temperature, low noise amplifier 18.After antenna 10, elementary receive path comprises generalized ribbon bandpass filter (not shown) and additional non-low temperature, the low noise amplifier 22 that is disposed in the universal duplexer 20.Universal duplexer 20 further comprises the general transmitting filter (not shown) that is connected with antenna 10 as a sendaisle part.
Sendaisle originate in be devoted to circuit 24 that linear power amplifier 26 is connected on produce the transmission CDMA treatment circuit 22 of CDMA modulated transmit signal.The CDMA modulation signal is amplified by linear power amplifier 26 and feed-in universal duplexer 20 carries out the preparation of filtering do through antenna 10 emissions.In theory, general transmitting filter is used for blocking the noise that linear power amplifier 26 produces at the passband of the base station and the receiving filter of other contiguous base station.This noise is called spectral re-growth usually in cdma system, will improve the noise floor of elementary and diverse reception paths to limiting the degree that receives CDMA treatment circuit 28 demodulation and handle the ability of the RF signal of being uploaded and being received by the base station.
Summary of the invention
According to an aspect of the present invention, have reception and comprise highly selective filter with input/output port according to the communication station of the antenna of the signal of communication of code-based modulation scheme modulation, wherein input port connects antenna, the low noise amplifier that connects the highly selective filter output port, and connect low noise amplifier and response demodulator according to the signal of code-based modulation scheme modulation.
In preferred embodiment, code-based modulation scheme is that CDMA and highly selective filter comprise the high-temperature superconductor assembly.Low noise amplifier can be non-low temperature amplifier or be disposed in the cryogenic box.Communication station comprises further that preferably the transmitting filter and this transmitting filter that connect antenna can be non-superconducting filter.
In another preferred embodiment, demodulator is that a part and the low noise amplifier of data processing module is directly connected to data processing module.
Highly selective filter can have the additional noise composition that approximately is not more than 1dB, and comprises at least 10 limits for a bandwidth at least about 1%, or is not more than about 0.3% bandwidth for one and comprises at least 5 limits.Code-based modulation scheme can be W-CDMA.
In another preferred embodiment, communication station links together with the downstream signal and the communication equipment that send to communication equipment by the signal of uploading from communication equipment in RF communication.Downstream signal comprises that the power control information of uploading power level signal transmits decisive factor.Upload signal by the highly selective filter reception and reduce the power control information transmission, and receive the power level of uploading signal minimizing communication equipment by highly selective filter.
Use to reduce the available channel capacity that the power control information transmission produces by communication station, communication station can be in RF communication combines with extra communication equipment.Upload signal by the highly selective filter reception, increased more abilities of uploading signal that link together with additional communication equipment that receive.
According to a further aspect in the invention, have reception and comprise the filter with input/output interface according to the communication station of the antenna of the signal of communication of code-based modulation scheme modulation, wherein the input port connects antenna, and this filter comprises the high-temperature superconductor assembly.This communication station further comprises the low noise amplifier of the output that connects highly selective filter, and connects low noise amplifier and in response to the demodulator according to the signal of code-based modulation scheme modulation.
Code-based modulation scheme can be CDMA, and low noise amplifier can be non-low temperature amplifier or be disposed in the cryogenic box.Communication station can comprise the transmitting filter that connects antenna, and this transmitting filter can be a non-superconducting filter.
Be more preferably, demodulator is the part of data processing module, and low noise amplifier is directly connected to data processing module.
According to a further aspect in the invention, have reception and comprise highly selective filter with input/output port according to the communication station of the antenna of the signal of communication of code-based modulation scheme modulation, wherein the input port connects antenna, one connects the low noise amplifier of signal of communication that the highly selective filter delivery outlet produces the filtering of amplification, and connects low noise amplifier and in response to the demodulator according to the signal of code-based modulation scheme modulation.The signal of communication feed-in demodulator of the filtering of amplifying need not further effectively, and RF selects filtering.
According to a further aspect in the invention, according to code-based modulation scheme, communication system comprises with communication equipment carries out communication equipment and the base station that RF communicates by letter.This base station comprises highly selective filter in RX path.
Highly selective filter preferably includes the high-temperature superconductor assembly, and the base station may further include non-low temperature low noise amplifier or low noise amplifier and cryogenic box, has disposed low noise amplifier in the case.The base station may further include transmitting filter and antenna, and the highly selective filter in the RX path and transmitting filter all are connected to antenna.Transmitting filter can be a non-superconducting filter.Highly selective filter in the RX path can be directly connected to antenna.
In another preferred embodiment, communicate by letter with RF between communication equipment and comprise the signal of uploading that receives from the downstream signal of base station and base station in the base station, and the pilot channel of downstream signal with the transmission of transmission power control message controlled the power level of communication equipment.Upload signal by the highly selective filter reception and simplified the power control messages transmission on the pilot channel, and reduced the power level of communication equipment.Communication system can comprise that the communication station of available channel capacity carries out the additional communication equipment that RF communicates by letter by reducing the power control information transmission with use.Upload signal by the highly selective filter reception, when receiving on the communication equipment of first title of signal outside the RF communication distance, make the intensity stabilization of downstream signal.
In a preferred embodiment, communication equipment is that in the communication equipment that RF communicates by letter is carried out in multiple and base station, the base station comprises that transmitter so that RF communication comprise down link, the base station has the downlink capacity that transmits a signal to multiple communication equipment, and the highly selective filter in the RX path increases downlink capacity.
According to another aspect of the present invention, the performance methodology that improvement has the communication station of receive path may further comprise the steps: set up RF communication according to code-based modulation scheme between multiple communication equipment and communication station, replacing to than the 1st filter by the 1st filter with operating office has the 2nd highly selective filter of high selectivity more to revise communication station, and multiple communication equipment with the communication station of revising between set up improved RF and communicate by letter.
Highly selective filter preferably includes the high-temperature superconductor assembly, and code-based modulation scheme CDMA preferably.
Communication station can comprise sendaisle, and RF communication can comprise downstream signal by sendaisle and the signal of uploading by receive path.Improved RF communication comprises the capacity to upward signal and downstream signal increase.Downstream signal can comprise that transmission power control information is transmitted and control the multiple communication equipment pilot channel of the power level of locking equipment really, reduces the power control information transmission on the pilot channel so that improved RF communication is included in.Improved RF communication comprises the minimizing in the power level of locking equipment really of multiple communication equipment equally.
Downstream signal can have the signal strength signal intensity that receives on the locking equipment really at multiple communication equipment, and improved RF communication comprises that the signal strength signal intensity that makes above RF communication distance scope is stable.
By the following detailed description relevant with accompanying drawing, other characteristic and advantage intrinsic in communication station and the system are declared and disclose or will become apparent for those skilled in the art.
The accompanying drawing summary
Fig. 1 is the block diagram of prior art cdma base station;
Fig. 2 is the graphic representation of the part of wireless communication system according to an aspect of the present invention, and wherein the calling from many communication equipments is handled in the base station;
Fig. 3 is the simplified block diagram of the base station of Fig. 2 according to an aspect of the present invention, detailed those assemblies of directly linking the CDMA signal processing of having described;
Fig. 4 is the front end block diagram of the CDMA assembly of Fig. 3 according to another aspect of the present invention;
Fig. 5 A is that the channel of screen capture uses and the test cell demonstration of power during the volume test of prior art cdma base station shown in Figure 1;
Fig. 5 B shows according to the channel use of screen capture during the volume test of base station of the present invention and the test cell of power;
Fig. 6 is that the mobile transmitted power (MTX) of test communications equipment is with the curve chart that leaves prior art cdma base station shown in Figure 1 and become according to the distance of base station of the present invention;
Fig. 7 is that the received signal intensity indication (RSSI) of test communications equipment received signal intensity is with the curve chart that leaves prior art cdma base station shown in Figure 1 and become according to the distance of base station of the present invention;
Fig. 8 is that the signal bit energy noise floor of the pilot channel that received by communication equipment is than (E
c/ I
o) with the curve chart that leaves prior art cdma base station shown in Figure 1 and become according to the distance of base station of the present invention.
The detailed description of preferred embodiment
The present invention has the improvement in performance of the wireless communication system of RF communication elements at basis such as the code-based modulation scheme of CDMA usually.These improve by add highly selective filter in communication station accomplished, these communication stations such as base station or any other be with one perhaps multi-communication devices (for example, mobile radiotelephone) carry out the transceiver elements of RF design of communication.More particularly, as hereinafter stating, these improvement can replace to more by the filter that will before pack into that the filter of high selectivity obtains in existing communication system.
According to Fig. 2, the present invention can carry out together with the wireless communication system of pointing out on 50, and this system has the communication station 52 that can constitute centralized base-station (being " base station 52 " hereinafter) for the district that has one or more common communications equipment 53.There is one or more antenna 54 base station 52, as known to persons skilled in the art, antenna can be directed also can be non-directional.Accordingly, in fact the district that is covered by communication station 52 can be divided into multiple sector.For the sake of simplicity, understand for implement the following definite assembly of multiple sector environment, aspect or on the element basis that can duplicate, make up or revise, the present invention will describe in single district or sector environment.
Through antenna 54, base station 52 receives one or more RF signals of communication and sends one or more RF signals of communication by downlink path 58A-58C respectively by up path 56A-56C respectively.As used herein, should recognize widely and quote any aspect that " upward signal " and " downstream signal " comprises these RF signals of communication.It should be noted that downstream signal 58A-58C only actually is that the base station constitutes single downstream signal.
No matter communication system 50 can comprise can the carrying out that RF communicates by letter with base station 52 of any kind and the communication equipment of the characteristic of the information that transmits through the upstream or downstream signal.For example, communication system 50 has the mobile radiotelephone 60 that is used to transmit voice and/or data message, and be used for that voice or data message transmit be commonly referred to as 62 fixing and/or mobile computer terminal.The wireless RF communication that have permanent plant relevant same, that this communication system can comprise other type with firm 64 or other residence 66.
Communicate by letter with 66 RF in order to set up such and communication equipment 53, must there be enough capacity base station 52, this capacity is determined by many factors and its minimum capacity is not the throughput of CDMA treatment circuit, and this treatment circuit produces the descending and upward signal of modulation and demodulation respectively.Accordingly, the capacity of base station 52 also can be counted as be used to handle many upward signals by the uplink capacity relevant with the capacity of base station 52 and the relevant downlink capacity of the capacity with base station 52 that is used to handle many downstream signals form.The all told of base station 52 is concrete down link and uplink capacity, can briefly be defined as the maximum data throughput in the path of being discussed or user's maximum quantity, maximum set bit rate or its combination more precisely.
Fig. 3 describes base station 52 in detail.Known to a person skilled in the art as those, the part of base station 52 (be used to distinguish or multiple sector on any other transceiver that is arranged in central authorities of RF communication) can be divided into those usually along the transmit path configuration and along the part of one or more RX path configurations.Transmit path can stop with primary antenna (or all antennas) 70, and RX path is initial with primary antenna 70 (as directed in the duplex structure) or diversity type reception antenna (or all antennas) 72.Wiring coaxial or other suitable impedance is coupled to duplexer 74 and diversity type receiving filter 76 with elementary and diversity type reception antenna 70 and 72 respectively.The RF signal of being handled by these assemblies will further describe about the remaining reception and the element of transmit path hereinafter.
According to an aspect of the present invention, in highly selective filter 77 (Fig. 4) and diversity type receiving filter 76 in elementary and diversity type reception antenna 70 and the 72 upward signal feed-in duplexers of collecting 74, this filter constitutes highly selective filter equally.Each highly selective filter 76,77 is designed to select the frequency band of required RF signal of communication, this signal is collected and difference feed-in input terminal 78 or 80 (Fig. 4) by antenna 70 and 72, so that the band-pass response of filtering to be provided respectively at outlet terminal 82 and 84 (Fig. 4). Outlet terminal 82,84 is coupled to a pair of low noise amplifier 86,88 successively, and the filtering of filter 76,77 is exported amplification and do not introduced any big loss.
Each highly selective filter 76,77 is the HTS filter preferably, and this filter has the multiple resonance chamber that utilizes superconductor, fabulous inhibition is provided and keeps extremely low insertion loss.More particularly, such HTS filter can comprise one or more assemblies with thick superconductive material membrane.(Mt.Prospect, suitable HTS filter Illinois) is and with trade mark SpectrumMaster can to use Illinois superconduction company
And RangeMaster
Low noise amplifier in the integrated equipment of selling is in conjunction with obtaining many Cellular Networks and PCS frequency band.
Can utilize the highly selective filter of other type to substitute the HTS filter so that high inhibition and low insertion loss to be provided.For example, those those skilled in the art easily recognize provides the non-superconducting filter of improving response and comprises the filter of being made up of the definite non-superconducting pottery with low noise level when turning round in low temperature environment.No matter the composition material of filter how, highly selective filter used herein preferably constitute any for about 1% or more (being typically complete or whole band systems) bandwidth the filter of ten or more multipole point is arranged, any for about 0.3% or still less bandwidth (being typically the special channel system) have the filter of five or more multipole point.More preferably, this filter for about 1% or more bandwidth 12 or more multipole point are arranged, and for about 0.3% or still less bandwidth six or more multipole point are arranged.Best is, this filter for about 1% or more bandwidth 16 or more multipole point are arranged, and for about 0.3% or still less bandwidth eight or more multipole point are arranged.
HTS or other highly selective filter equally preferably have additional about 1dB or noise contribution still less, more preferably about 0.7dB or still less, and best be 0.5dB or still less.Should be noted that above-mentioned noise level value yes change with temperature and therefore need to adjust.
Each HTS filter 76,77 is coupled to LNA86,88 by 50 ohm coaxial cable known to those of skill in the art or other suitable transmission line respectively.Be the loss of signal of avoiding reflecting and causing thereupon, transmission line should with HTS filter 76,77 and LNA86,88 impedance matchings.Each LNA86,88 export filtering amplification have with HTS filter 76,77 passband correspondent frequency scopes on the RF signal of fixed gain amount.For example, LNA86,88 can provide the gain of about 25dB and have the maximum noise value of about 1.2dB (room temperature) on 1850 to 1910MHz frequency range.According to one embodiment of present invention, each LNA86, the 88th, GaAs based amplifier is to take low-temperature operation into account.(Camarillo, production number JC12-2342D California) obtains such LNA from JCA Technology.As selection, LNA86,88 provides similar gain magnitude on lower frequency range (824 to 849MHz).Such LNA obtains from the production number JCA01-3149 of JCA Technology.
According to another embodiment of the present invention, LNA86, the 88th, any commercially available, non-low temperature low noise amplifier.
Fig. 4 has shown above-described highly selective filter 76,77 and has been disposed at LNA86,88 in the single cryogenic box 90.The suitable cryogenic box relevant with above-mentioned integrated equipment can obtain by Illinois superconduction company.These elements that have the base station 52 of elementary and diversity type reception antenna 70,72 and any insertion cable can be thought " front end " or a fast part (being commonly referred to as 91) and the responsible RF of the reception upward signal of RF mould.The same residue assembly (on the transmit path) that has shown the RF mould fast 91 of base station 52 in Fig. 4 is called as transmitting filter 92 and linear power amplifier (LPA) 94.In operating process, LPA94 amplifies the RF signal that transmits through primary antenna 70 that base station 52 produces on down link.Transmitting filter 92 is disposed in the duplexer 74 and produces the frequency component of interference with decay is any along with receiving upward signal in order to LPA94 is coupled to primary antenna 70.Transmitting filter 92 can be universal filter or comprise the assembly that has superconductor.The duplexer that is disposed at cryogenic box that has transmitting filter 92 and filter 76,77 can obtain by Illinois superconduction company.Though generally can use any generalized ribbon bandpass filter that is used for transmit path (as, the transmitting filter that provides with Motorola SC614T base transceiver subsystem), when the line frequency band was especially near upstream band instantly, the superconduction transmitting filter can provide required inhibition.
About Fig. 3, fast 91 (Fig. 4) of RF mould receive input terminal 106 connection data processing moulds fast 100 by sending input terminal 102, elementary reception outlet terminal 104 and diversity type usually once more.Data processing mould fast 100 should be understood to include base station 52 those not only on the RF frequency operation but at intermediate frequency (IF) at base band frequency or digital form assembly along upstream or downstream link processing signal.Data processing mould fast 100 correspondingly include but are not limited to: with such as the relevant hardware and software of the digital signal processing algorithm of coding/decoding and error correction, and point to circuit such as the interface of the RF mould fast 91 of modulator and equalizer.
Receive the input path about elementary and diversity type, the filtering that is provided by LNA86,88 and the RF signal of amplification are down-converted to intermediate frequency or are directly downconverted to base band frequency by lower frequency changer circuit (as frequency mixer) 102,104 or other assembly known to those of skill in the art separately.Filtering in the IF frequency band and other signal processing will produce thereupon and be the demodulation of the signal of communication that is received by the one or more demodulators 106 required degree of preparing, and this demodulator response is according to the signal of code-based modulation scheme modulation.More particularly, be separated at the spread-spectrum of demodulator 106 filtered baseband signal on the meaning of the channel of coding wherein, demodulator 106 is the CDMA demodulator preferably.As referred, demodulator 106 meets the feature of the broadband interface of TRX module and above-mentioned Motorola SC614T BTS on function, and need not to carry out in any special construction.Except the processing according to CDMA or other coding, demodulator 106 also can processing signals removes and be used to QPSK or other modulation scheme of assisting in transmission.Be in harmonious proportion after CDMA handles separating, the central controller 108 of the bit stream feed-in base station 52 of generation further handle as the strength ratio between elementary and diversity reception signal than and further be sent to another communication station (not shown) in the communication network.
As those skilled in the art was in common knowledge, central controller 108 comprised hardware, software, program firmware or other combination thus, came to carry out for multiple communication equipment the algorithm of the content (i.e. instruction) that is comprised in definite power control messages.Power control messages is controlled the power level that communication equipment sends upward signal successively.
In transmit path, downstream signal is produced with digital form by central controller 108 or provides and handled by modulator 110.The circuit relevant with modulator 110 not only prepared the analog baseband signal according to code-based modulation scheme (as CDMA), and further baseband signal converted to the signal that QPSK or other type are fit to transmission.QPSK or other modulated signal feed-in upconverter or mixer 112 produce the RF signal that those assemblies of the RF mould fast 91 that is used for by transmit path transmit.
Shown system improvement and beyond thought results of property according to the operation of the basic communication system of above-mentioned sign indicating number of the present invention than current use.According to an aspect of the present invention, communicate by letter by at first between multiple mobile radio unit and the communication station consistent or similar, setting up RF with above-mentioned Motorola base station, secondly revise communication station by the highly selective filter that the RF selective filter in elementary and the diversity type RX path is replaced to above-mentioned proposition, shown improved results of property.Screen capture and chart 5A-B and 6-8 provide the data representation of the improved RF communication between the communication station that is based upon communication equipment and modification.
Fig. 5 A and 5B have shown that the capacity of the test sector of the base station that has non-highly selective filter in the RX path that is coupled to non-low temperature LNA is used for substituting the result who compares in the base station of the RangeMaster of non-highly selective filter and non-low temperature LNA with the RX path front end of being revised by its original structure that is included in.Transmitting filter in the transmit path also is replaced guarantees duplexer middle impedance unanimity.Yet, should be noted that place of filters still is non-highly selective filter and in fact has the selectivity lower a little than the filter that is replaced.Like this, though practice of the present invention is not limited to the structure of such modification, only produce the according to the present invention base station component substantial correction relevant with RX path.
Other sector that is written into the base station artificially guarantees that business can be sent to the test sector between the comparable period.Supervising device is coupled to base station component and suitably is downstream signal measured channel energy.Because voice activity and other will influence Capacity Ratio through the data that up link transmits, on up link, be not with activity ground to obtain comparing data and guarantee that test is subject to down link.Therefore the capacity that compares is actually the capacity of base station down link.
For each base station, use many Wireless Telecom Equipments to determine the maximum quantity of the calling that can distribute.These equipment are positioned near the edge in district and fix.Shown in Fig. 5 A, general base station allows to distribute nine callings to channel (except non-Traffic Channel, as pilot tone, synchronous and paging channel) before the base station begins to cancel calling.The channel energy of on noise level, expanding shown in each calling has.Set up RF based on the above-described filter of replacement with the base station of LNA and use modification and communicate by letter, downlink capacity increases to allow five callings outside the allocation, shown in Fig. 5 B (whole 14 channels deduct three and control or non-Traffic Channel).
Equally Fig. 5 of screen capture A be the description of the gross power relevant shown in the 5B with down link signal.Total transmitted power of general base station is 40.88dB, is benchmark (dBm) with 1 milliwatt, and total transmitted power of the base station of revising only is 38.55dBm.Like this, base station with highly selective filter not only has the capacity of the more callings of processing of increase, and be to have reduced gross power, think that therefore the power control algorithm of central controller 108 execution can more effectively be distributed power in professional and control channel.
The compare test of following series is pointed to and collect data when the mobile test unit is moved with respect to the base station.The particularly mobile transmitted power of feature (MTX) that mobile test equipment can be monitored the uplink and downlink link signal (Fig. 6), the volume indicator (RSSI) of received signal (Fig. 7) and the signal bit energy noise level of pilot channel than (E
c/ I
o) (Fig. 8).In every figure of Fig. 6-8, the data that mobile test equipment is collected are marked and drawed (by the GPS device measuring) with the function of Position Latitude, and this position is consistent with the distance to the base station.The latitude increase is consistent with the distance increase between mobile device and base station.
Fig. 6-8 proposed for general and the base station actual measurement revised and according to the collection data of linear regression analysis.The result of linear regression analysis will come together to further describe with every specific figure.
Fig. 6 comprises the linear regression line 200 of average mobile transmitted power of expression general base station operating period and the linear regression line 202 of the average mobile transmitted power during the base station operation that representative is revised.During each stage of compare test, 7 equipment is assigned to the channel except the channel of distributing to test cell.By alternative line 200 and 202, as can be seen for all monitoring range points, mobile device is instructed to send (can send) with lower power.
RSSI level when Fig. 7 has compared the same paths of passing through when test cell and moves in Fig. 6.In general, rssi measurement reflects communication equipment many downstream signals that receive well.Linear regression line 204 demonstrate when test cell during away from general base station signal strength signal intensity significantly descend, and no matter line 206 demonstrates the increase of transmitting range, it is constant relatively that signal strength signal intensity keeps.Consider the modification that lacks any essence, be noticeable and show the efficient of ability of distribution power of central controller and the increase of compatibility without any the obvious minimizing of signal strength signal intensity to transmit path.
Fig. 8 has shown the pilot channel bit energy ratio that receives when the same paths of passing through when test cell moves in Fig. 6 and 7.As a rule, as skilled in the art will appreciate, if signal bit energy ratio drop to-below 14, communication equipment will be lost pilot channel (in noise level) and be compelled to cancel calling.Yet for to business or voice-channel assignment maximum power, it is desirable that a minimum power is used for pilot channel.Line 208 meets the signal bit energy ratio for the general base station operation, and line 210 has shown the consistent low signal bit energy for the base station operation of revising.Based on foregoing, look that because the modification of the RX path of base station, lower power is assigned to pilot channel.This meets the described lower total transmitted power that is used to support the calling of greater number of Fig. 5 B.
The improvement that above-mentioned test relatively demonstrates in the following base station performance can realize in using communication station of the present invention:
(1) capacity that on up path, increases, the maximum quantity of concurrent user will increase on up link, or as selection, the total bitrate of a channel (or all channels) is with on the meaning that increases;
(2) capacity that on downlink path, increases, the maximum quantity of concurrent user will increase on down link, or as selection, the total bitrate of a channel (or all channels) is with on the meaning that increases;
(3) minimizing of the average transmitting power of the communication equipment of transmission upward signal;
(4) minimizing of the average power of the pilot channel of downstream signal;
(5) increase the transmitted power of definite mobile unit with more effective accuracy of distributing the power control algorithm of power more consistently;
(6) based on contiguous CDMA Channel and other high selectivity of the high selectivity that provides by HTS
The minimizing of the safety belt size between filter.
Above-described cdma system can be a kind of in several different code-based modulation schemes or the wireless air interface.For example, this cdma system can be followed IS-95CDMA air-interface standard or cdma2000 standard, W-CDMA standard or any other code-based modulation scheme.Therefore, should be understood that practice of the present invention is not limited to any specific frequency band or coding structure device.
Highly selective filter and LNA should further be recognized that the present invention is not limited to the physical structure of building block in any RF module, because can or can not be integrated in single independently unit.In addition, the present invention is not limited to the RF module with single worker or duplex structure, also is not limited to the base station with quantification sector.
When receiving or transmit path when comprising the HTS filter, this RF module can comprise that shunting device determines when that the HTS filter should or should not handle the signal of receiving.As is generally known and the invention that will solve jointly described, select bypass HTS filter to be undertaken by the controller that is integrated in separate unit.
Though RF receiver 10 is well suited for using and here described in the context, the person having ordinary skill in the art will recognize gradually that religious doctrine of the present invention is in no way limited to such environment for use with radio telecommunications system.On the contrary, the receiver that constitutes according to religious doctrine of the present invention can be used in any application of benefiting from the various amplifiers that high performance filter and it is provided, and does not deviate from scope of the present invention and main idea.In this main idea, should be realized that employed " communication station " comprises the communication terminal of any kind in the system that sends and/or receive the RF signal here, and therefore should be including, but not limited to the Cellular Networks telephone base station.
Just to understanding that understanding has provided above-mentioned detailed description, and therefrom it will be appreciated that there is not unnecessary restriction, is conspicuous because revise for those skilled in the art.
Claims (67)
1. communication station with reception according to the signal of communication antenna of code-based modulation scheme modulation is characterized in that comprising:
Have the highly selective filter of input and output port, wherein input port is coupled to antenna;
Be coupled to the low noise amplifier of the output port of highly selective filter; And
Be coupled to low noise amplifier and in response to demodulator according to the signal of code-based modulation scheme modulation.
2. communication station as claimed in claim 1 is characterized in that code-based modulation scheme is CDMA.
3. communication station as claimed in claim 2 is characterized in that highly selective filter comprises the high-temperature superconductor assembly.
4. communication station as claimed in claim 3 is characterized in that low noise amplifier is non-low temperature amplifier.
5. communication station as claimed in claim 3 is characterized in that further comprising the cryogenic box that disposes low noise amplifier.
6. communication station as claimed in claim 3 is characterized in that further comprising the transmitting filter that is coupled to antenna.
7. communication station as claimed in claim 6 is characterized in that transmitting filter is a non-superconducting filter.
8. communication station as claimed in claim 1 is characterized in that demodulator is the part of data processing module; And low noise amplifier directly connects data processing module.
9. communication station as claimed in claim 1 is characterized in that highly selective filter has the additional noise composition that approximately is not more than 1dB.
10. communication station as claimed in claim 1 is characterized in that highly selective filter comprises at least 10 limits for a bandwidth at least about 1%.
11. communication station as claimed in claim 1 is characterized in that highly selective filter is not more than about 0.3% bandwidth for one and comprises at least 5 limits.
12. communication station as claimed in claim 1 is characterized in that code-based modulation scheme is W-CDMA.
13. communication station as claimed in claim 1, it is characterized in that it makes up with communication equipment in RF communicates by letter with the down link signal that sends to communication equipment by the uplink signal from communication equipment, wherein down link signal comprises the power control messages of decision uplink signal power level.
14. combination as claimed in claim 13 is characterized in that having simplified power control messages by highly selective filter receiving uplink signal.
15. combination as claimed in claim 13 is characterized in that having reduced by highly selective filter receiving uplink signal the power level of communication equipment.
16. combination as claimed in claim 13, it is characterized in that with use by the power control messages of simplifying the communication station of available channel capacity to carry out RF further to make up with additional communication equipment in communicating by letter.
17. combination as claimed in claim 16 is characterized in that increasing the capacity that receives the more uplink signals relevant with additional communication equipment by highly selective filter receiving uplink signal.
18. one kind has the communication station that is used to receive according to the antenna of the signal of communication of code-based modulation scheme modulation, it is characterized in that comprising:
Have the filter of input and output port, wherein input port is coupled to antenna, and filter comprises the high-temperature superconductor assembly;
Be coupled to the low noise amplifier of the output port of highly selective filter; And
Be coupled to low noise amplifier and in response to demodulator according to the signal of code-based modulation scheme modulation.
19. communication station as claimed in claim 18 is characterized in that code-based modulation scheme is CDMA.
20. communication station as claimed in claim 19 is characterized in that low noise amplifier is non-low temperature amplifier.
21. communication station as claimed in claim 19 is characterized in that further comprising the cryogenic box that disposes low noise amplifier.
22. communication station as claimed in claim 19 is characterized in that further comprising the transmitting filter that is coupled to antenna.
23. communication station as claimed in claim 22 is characterized in that transmitting filter is a non-superconducting filter.
24. communication station as claimed in claim 18 is characterized in that demodulator is the part of data processing module; And low noise amplifier directly connects data processing module.
25. communication station as claimed in claim 18, it is characterized in that it makes up with communication equipment in RF communicates by letter with the down link signal that sends to communication equipment by the uplink signal from communication equipment, wherein down link signal comprises the power control messages of decision uplink signal power level.
26. combination as claimed in claim 25 is characterized in that having simplified power control messages by highly selective filter receiving uplink signal.
27. combination as claimed in claim 25 is characterized in that having reduced by highly selective filter receiving uplink signal the power level of communication equipment.
28. combination as claimed in claim 25, it is characterized in that with use by the power control messages of simplifying the communication station of available channel capacity to carry out RF further to make up with additional communication equipment in communicating by letter.
29. combination as claimed in claim 28 is characterized in that increasing the capacity that receives the more uplink signals relevant with additional communication equipment by highly selective filter receiving uplink signal.
30. one kind has the communication station that is used to receive according to the antenna of the signal of communication of code-based modulation scheme modulation, it is characterized in that comprising:
Have the highly selective filter of input and output port, wherein input port is coupled to antenna;
The low noise amplifier that is coupled to the output port of highly selective filter produces the signal of communication of the filtering of amplification; And
Be coupled to low noise amplifier and in response to the demodulator according to the signal of code-based modulation scheme modulation, wherein the signal of communication of the filtering of Fang Daing be need not further effective choice filtering by the feed-in demodulator.
31. communication station as claimed in claim 30 is characterized in that code-based modulation scheme is CDMA.
32. communication station as claimed in claim 31 is characterized in that highly selective filter comprises the high-temperature superconductor assembly.
33. communication station as claimed in claim 32 is characterized in that low noise amplifier is non-low temperature amplifier.
34. communication station as claimed in claim 32 is characterized in that further comprising the cryogenic box that disposes low noise amplifier.
35. communication station as claimed in claim 30 is characterized in that highly selective filter has the additional noise composition that approximately is not more than 1dB.
36. communication station as claimed in claim 30 is characterized in that further comprising the transmitting filter that is coupled to antenna.
37. communication station as claimed in claim 36 is characterized in that transmitting filter is a non-superconducting filter.
38. communication station as claimed in claim 30 is characterized in that demodulator is the part of data processing module; And low noise amplifier directly connects data processing module.
39. communication station as claimed in claim 30, it is characterized in that it makes up with communication equipment in RF communicates by letter with the down link signal that sends to communication equipment by the uplink signal from communication equipment, wherein down link signal comprises the power control messages of decision uplink signal power level.
40. a communication system is characterized in that comprising:
Communication equipment; And
Carry out that RF communicates by letter and on RX path, comprise the base station of highly selective filter according to code-based modulation scheme and communication equipment.
41. communication system as claimed in claim 40 is characterized in that highly selective filter comprises the high-temperature superconductor assembly.
42. communication system as claimed in claim 41 is characterized in that the base station further comprises non-low temperature low noise amplifier.
43. communication system as claimed in claim 41 is characterized in that the base station further comprises low noise amplifier and the cryogenic box that disposes low noise amplifier.
44. communication system as claimed in claim 43 is characterized in that:
The base station further comprises transmitting filter and antenna; And
Highly selective filter and transmitting filter on the RX path are coupled to antenna.
45. communication system as claimed in claim 44 is characterized in that transmitting filter is a non-superconducting filter.
46. communication system as claimed in claim 44 is characterized in that the highly selective filter in the RX path couples directly to antenna.
47. communication system as claimed in claim 41 is characterized in that:
Communicate by letter with RF between communication equipment and comprise down link signal that is sent by the base station and the uplink signal that is received by communication base station in the base station; And
Down link signal comprises and is used for the pilot channel that transmission power control message is controlled the power level of communication equipment.
48. communication system as claimed in claim 47 is characterized in that having simplified the power control messages on the pilot channel by highly selective filter receiving uplink signal.
49. communication system as claimed in claim 47 is characterized in that having reduced by highly selective filter receiving uplink signal the power level of communication equipment.
50. communication system as claimed in claim 47 is characterized in that further comprising that the communication station of available channel capacity carries out the additional communication equipment that RF communicates by letter by the power control messages of simplifying with use.
51. communication system as claimed in claim 47 is characterized in that:
Down link signal has the signal strength signal intensity that receives on communication equipment; And
Make signal strength signal intensity stable in RF communication distance scope by highly selective filter receiving uplink signal.
52. communication system as claimed in claim 41 is characterized in that the base station comprises that demodulator and low noise amplifier coupling demodulator are to highly selective filter.
53. communication system as claimed in claim 52 is characterized in that demodulator is the part of data processing module; And low noise amplifier directly connects data processing module.
54. communication system as claimed in claim 53 is characterized in that code-based modulation scheme is CDMA.
55. communication system as claimed in claim 51 is characterized in that highly selective filter has the additional noise composition that approximately is not more than 1dB.
56. communication system as claimed in claim 51 is characterized in that highly selective filter comprises at least 10 limits for a bandwidth at least about 1%.
57. communication system as claimed in claim 51 is characterized in that highly selective filter is not more than about 0.3% bandwidth for one and comprises at least 5 limits.
58. communication system as claimed in claim 51 is characterized in that:
Communication equipment is that a kind of of multiple communication equipment that RF communicates by letter carried out in multiple and base station;
The base station comprises transmitter, so that RF communication comprises down link;
The base station has the downlink capacity that is used to transmit a signal to multiple communication equipment; And
Highly selective filter in the RX path increases downlink capacity.
59. communication station as claimed in claim 41 is characterized in that code-based modulation scheme is W-CDMA.
60. an improvement has the method for performance of the communication station of RX path, it is characterized in that may further comprise the steps:
(a) communicate by letter setting up RF between multiple communication equipment and communication station according to code-based modulation scheme, wherein RX path comprises the 1st filter;
(b) have more than the 1st filter by using that the 2nd highly selective filter of high selectivity replaces the 1st filter, revise communication station; And
(c) between the communication station of multiple communication equipment and modification, set up improved RF communication.
61. method as claimed in claim 60 is characterized in that highly selective filter comprises high temperature, superconductor component.
62. method as claimed in claim 61 is characterized in that code-based modulation scheme is CDMA.
63. method as claimed in claim 62, it is characterized in that communication station further comprises transmit path, RF communication comprises the uplink signal through the down link signal of transmit path and process RX path, and improved RF communication comprises the capacity that increases uplink signal and down link signal.
64., it is characterized in that down link signal comprises that being used for transmission power control message controls the multiple communication equipment pilot channel of the power level of locking equipment really as the described method of claim 63.
65., it is characterized in that improved RF communication comprises the power control messages of simplifying on the pilot channel as the described method of claim 64.
66., it is characterized in that improved RF communication comprises the multiple communication equipment of the reduction power level of locking equipment really as the described method of claim 64.
67., it is characterized in that as the described method of claim 64:
Down link signal has the signal strength signal intensity that receives on the locking equipment really at multiple communication equipment; And
Improved RF communication is included in the stability of signal strength signal intensity in the RF communication distance scope.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US49059600A | 2000-01-25 | 2000-01-25 | |
| US09/490,596 | 2000-01-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1411631A true CN1411631A (en) | 2003-04-16 |
Family
ID=23948713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN01804006A Pending CN1411631A (en) | 2000-01-25 | 2001-01-24 | CDMA communication system having highly selective filter |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1250764A2 (en) |
| JP (1) | JP2001251241A (en) |
| KR (1) | KR20010076217A (en) |
| CN (1) | CN1411631A (en) |
| AU (1) | AU2001229758A1 (en) |
| IL (1) | IL150537A0 (en) |
| WO (1) | WO2001056170A2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100344189C (en) * | 2004-11-10 | 2007-10-17 | 郑长春 | 3G mobile communication network base station up-down power amplifying march-past combination unit |
| CN107453727B (en) * | 2017-08-07 | 2021-01-15 | 大连海事大学 | Low-insertion-loss negative group time delay microwave circuit |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6963758B2 (en) | 2000-09-29 | 2005-11-08 | Ntt Docomo, Inc. | High-sensitivity wireless receiving device and high-frequency unit used therefor |
| DE10152344C1 (en) * | 2001-10-24 | 2003-06-05 | Siemens Ag | Arrangement for transmission/reception improvements in radio communications system with base station has individual transmitter-receivers per antenna in common thermal insulator |
| US8676134B2 (en) | 2003-07-04 | 2014-03-18 | Pirelli & C. S.P.A. | Highly reliable receiver front-end |
| WO2005053182A1 (en) * | 2003-11-25 | 2005-06-09 | Zte Corporation | A method and apparatu for implementing beam forming in cdma communication system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5244869A (en) * | 1990-10-23 | 1993-09-14 | Westinghouse Electric Corp. | Superconducting microwave frequency selective filter system |
| US5604925A (en) * | 1995-04-28 | 1997-02-18 | Raytheon E-Systems | Super low noise multicoupler |
| WO1997006606A1 (en) * | 1995-08-09 | 1997-02-20 | Superconducting Core Technologies, Inc. | Cryolectronic receiver front end for mobile radio systems |
| US6212404B1 (en) * | 1997-08-01 | 2001-04-03 | K&L Microwave Inc. | Cryogenic filters |
-
2000
- 2000-08-31 JP JP2000262798A patent/JP2001251241A/en active Pending
- 2000-10-17 KR KR1020000061051A patent/KR20010076217A/en not_active Application Discontinuation
-
2001
- 2001-01-24 WO PCT/US2001/002397 patent/WO2001056170A2/en not_active Application Discontinuation
- 2001-01-24 CN CN01804006A patent/CN1411631A/en active Pending
- 2001-01-24 AU AU2001229758A patent/AU2001229758A1/en not_active Abandoned
- 2001-01-24 IL IL15053701A patent/IL150537A0/en unknown
- 2001-01-24 EP EP01946993A patent/EP1250764A2/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100344189C (en) * | 2004-11-10 | 2007-10-17 | 郑长春 | 3G mobile communication network base station up-down power amplifying march-past combination unit |
| CN107453727B (en) * | 2017-08-07 | 2021-01-15 | 大连海事大学 | Low-insertion-loss negative group time delay microwave circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2001056170A3 (en) | 2002-04-04 |
| AU2001229758A1 (en) | 2001-08-07 |
| JP2001251241A (en) | 2001-09-14 |
| IL150537A0 (en) | 2003-02-12 |
| EP1250764A2 (en) | 2002-10-23 |
| WO2001056170A2 (en) | 2001-08-02 |
| KR20010076217A (en) | 2001-08-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8463217B2 (en) | Multiple band multiple input multiple output transceiver integrated circuit | |
| EP2421330B1 (en) | Encapsulation of independent transmissions over an internal interface of a distributed radio base station | |
| AU745488B2 (en) | Delay combiner system for CDMA repeaters and low noise amplifiers | |
| US8364106B2 (en) | Multiple band direct conversion radio frequency transceiver integrated circuit | |
| US9172420B2 (en) | Mobile communication terminal | |
| CN111343642B (en) | 5G signal radio frequency variable frequency distribution system | |
| EP2790330A1 (en) | Wireless communication transmitting and receiving system | |
| WO2002093767A1 (en) | Method and apparatus for increasing sensitivity in a communication system base station | |
| CN109474921B (en) | Ad hoc network emergency communication system and communication method thereof | |
| EP0868789B1 (en) | A base station receiver and a method for receiving a signal | |
| KR101791636B1 (en) | Base station signal matching device, base station interface unit and distributed antenna system comprising the same | |
| CN1411631A (en) | CDMA communication system having highly selective filter | |
| EP1111821B1 (en) | Wireless system combining arrangment and method thereof | |
| EP1645042B1 (en) | Higly reliable receiver front-end | |
| CN100579265C (en) | Shared radio frequency front end, base station and rdio frequency front end sharing method | |
| EP1325556B1 (en) | High frequency amplification circuit | |
| CN201260163Y (en) | Radio frequency extension apparatus and base station system | |
| US8340712B2 (en) | Method and system for utilizing diplexer/duplexer for WCDMA operation as a filter for supporting GSM-based operation | |
| CN2819659Y (en) | Direct WCDMA broadcast station of mobile telecommunication | |
| CN208402137U (en) | Multi-operator mobile communication network | |
| KR100246564B1 (en) | Equipment of bts in wll | |
| CN117118477B (en) | LTE, NB-IoT, loRa and Beidou multi-radio frequency fusion circuit, signal processing method and application | |
| CN201054589Y (en) | A radio frequency-selective repeater | |
| US8175561B2 (en) | Automatic optimization of RF receiver interference performance | |
| CN116470947A (en) | Measurement and control communication navigation compatible signal processing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |