CN1499867A - Method and device for realtime antenna to select emission diversity - Google Patents
Method and device for realtime antenna to select emission diversity Download PDFInfo
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Abstract
The method judges the intensity indication and signal quality of received signal in multiple channels of up link, and selects out the received signal in optimal channel as the receiving signal of up link. Meanwhile, the antenna corresponding to the optimal channel is as an emission antenna for down link or optimal emission antenna. Thus, the invention precludes error made by base station for judging optimal receiving and dispatching route when signal intensity received by an antenna is higher than signal intensities received by other antennae caused by interference. In the device, control processing unit controls working time sequence, sampling intensity indication of received signal, data sampling as well as controls switcher for changing-over between receiving and transmitting, and operation for switching antenna. The invention realizes balanced gain between up and down link so as to raise communication quality.
Description
Technical field
The present invention relates to digital mobile communication system at time division multiplexing, time division duplex, and radio base station in this system and radio portable terminal.Relate in particular to a kind of real-time antenna and select emission diversity method and device.
Background technology
Utilize transmit diversity techniques and reception diversity technology, can effectively contain in the wireless telecommunications because the signal fadeout that multipath transmisstion causes improves communication quality.The selecting type diversity technique is simple, practical, especially realizes cost and not high to the requirement of system complex degree, so be used widely in radio communication
Receive and select diversity, utilize at a distance of two antennas enough far away to receive, because antenna distance is far away, the correlation of received signal weakens, and the probability that declines simultaneously at two antenna receiving signals of synchronization reduces; Equally, utilize at a distance of two antennas enough far away or a plurality of antenna and select emission, many probability that can select the transmission path signal to decline simultaneously are equally very little.Utilize such characteristic, corresponding transmitting antenna just can be selected according to certain decision rule in the base station, thereby, for portable terminal provides best transmission path.
Present known selection emission diversity method and existing defective:
A. the antenna selection diversity mode that needs the portable terminal feedback information
Name is called " transmission antenna diversity " (number of patent application: 99805390.2 publication numbers: CN12985576A), " antenna switching diversity " (number of patent application: 99802344.2 publication numbers: CN1288616A) etc. patent has just adopted this method in the patent that has for example retrieved.This method needs portable terminal that the signal of many antenna emissions of base station is received one by one, compares, adjudicates, and selects the optimal antenna transmission path then and will select feedback information to give the base station, and the base station is according to using selecteed antenna to carry out the signal emission.It requires portable terminal to have the function of judgement and feedback information, and in fact, is not that all wireless terminals all have this function.If increase this function to portable terminal, the cost of portable terminal is increased, its limitation is tangible.
B. many antennas, single-shot, single receipts system
In this system, all be single pass owing to transmit and receive, so, use switch to switch, realize the reception or the emission of different antennae.
In the system of uplink and downlink with frequency, one of method commonly used is: the base station is set an antenna earlier and is used for receiving, and according to the signal strength signal intensity of reception, whether selects this antenna emission when determining downlink transmission then for use
Fig. 1 is traditional single schematic diagram that receives the selection diversity system of single transmit.System is made up of controlled processing unit 101, receiving element 102, transmitter unit 103, transmit-receive switch 104, antenna selection switch 105, antenna 106, antenna 107.Controlled processing unit 101 can make the base station enter emission or accepting state according to certain control timing control transmit-receive switch 104; In addition, controlled processing unit 101 is gone back control antenna selector switch 105, makes the base station receive with antenna 106 or antenna 107 or transmits.Up link working hour, the base station is in the reception shape.(RSSI) foundation as next work period emitting antenna selecting is indicated with the received signal intensity that receives in the base station, if i.e. received signal intensity indication surpasses certain thresholding in continuous several cycles, just select this antenna as the down link transmitting antenna of working hour, otherwise, carry out antenna and switch.
This method, owing to the signal that can not receive simultaneously on the multichannel antenna, it is best also just can not comparing that antenna.That is to say: this emission selection mode can guarantee that the current antenna that is used to receive can be used for emission, but can not guarantee to provide best transmission path for terminal.
Another kind of method commonly used in this system is: the base station, receives the received signal intensity of returning by the comparison different antennae and indicates (RSSI), the antenna when selecting the reasonable antenna of signal as downlink transmission in the cycle at different operating.There is defective equally in this method: at first, when receiver switched to another antenna and receives, just there was certain risk in itself, because the transmission path of another antenna may be not as good as the transmission path of current antenna.Secondly, owing to the comparison of the reception data of two cycles or a plurality of work periods, have certain time delay, base station selected optimal transmission paths for portable terminal, has been not the optimal transmission paths of current time.That is to say its real-time deficiency.
C. according to received signal intensity indication (RSSI) judgement transmitting antenna
For example (number of patent application: 9912544.9 publication numbers: what CN 1258138A) describe is exactly this method: the base station is only according to the foundation of received signal intensity indication (RSSI) as day line options for patent " radio communications set and transmitting antenna changing method ".There is certain defective equally in this method: because on behalf of the quality of received signal, any interference, received signal intensity (RSSI) can not fully all to influence received signal intensity indication (RSSI), thus the judgement that system is done make mistake.
Summary of the invention
The objective of the invention is shortcoming at antenna transmit diversity method in the above-mentioned mobile communcations system and device existence, provide a kind of real-time antenna to select emission diversity method and device, it can provide best transmitting for portable terminal, do not need the information of the base station signal of portable terminal feedback reception again, also will overcome the defective that only indication brings as the foundation of selecting antenna according to received signal intensity simultaneously.
To achieve these goals, the present invention adopts following technical scheme,
A kind of real-time antenna is selected emission diversity method, and this method is based on comprising in the base station that multichannel receives, single channel is launched, and this method may further comprise the steps:
A reads, stores in the work period through the received signal Frame on the N road receive path after the demodulation by controlled processing unit;
B reads, stores the sampled data that the received signal intensity on the receive path of N road is indicated in this cycle again;
C according to the signal strength indication value that is received on each receive path, chooses and has maximum received signal strength and indicate pairing antenna, as the preliminary election transmitting antenna;
D adjudicates the quality of pre-selected antenna received signal, and emitting antenna selecting is determined final selection transmitting antenna once more, as the transmitting antenna of next down link period work period.
Described step b further may further comprise the steps:
B1, controlled processing unit is repeatedly sampled to the signal strength indication value to each passage in the one-period;
B2 averages a plurality of sampled values of each receive path, obtains one group of signal strength indication value RSSI1, RSSI2 ... RSSIN.
During described step c preliminary election transmitting antenna, earlier to average received signal strength indicated value RSSI1, the RSSI2 of each passage ... RSSIN sorts from big to small, chooses the pre-transmitting antenna of antenna conduct on the maximum signal strength indication value institute respective channel again.
Described steps d further may further comprise the steps:
D1 at first is provided with a channel counter I, and it is worth corresponding receive path number, and the initial value that I is set is 1;
D2 reads the received signal Frame on the preliminary election transmitting antenna;
D3 extracts unique identifier word corresponding in this Frame;
D4 judges the unique identifier word in this frame signal and the correctness of check code.
In the described steps d 4, when unique identifier word and check code are judged,, carry out the judgement of second step, promptly extract the check code in this frame signal, this frame signal is carried out verification if unique identifier word is correct; The check code of check results and reception is compared, and whether judged result is correct, if the result is correct, illustrates that this signal quality has passed through the judgement of second step, determines that the pairing antenna of this passage is final transmitting antenna; If check results is incorrect, verification twin check result jumps to the Frame that the next one is had on time strong signal strength signal intensity indication passage and carries out the quality judgement.
Obstructed out-of-date when the judgement of signal quality, carry out following steps successively again:
With the selection of abandoning this passage, make channel counter add 1;
Changing pre-selected antenna is the pairing antenna of receive path that next stronger signal strength signal intensity is indicated;
And then the data on this pre-selected antenna are carried out quality adjudicate, repeat steps d 2, the above flow process of d3, d4 in the claim 4, so repeat, up to determining final transmitting antenna.
A kind of real-time antenna is selected transmission diversity apparatus, this device comprises multipath reception passage, a plurality of reception emission change over switch, single channel transmission channel, controlled processing unit, each road receive path contains an antenna that is used for space diversity, a receiving element, a demodulating unit, received signal field intensity indication sampling unit, a transmission channel and contains a transmitter unit, a modulating unit, an emitting antenna selecting switch
Each receiving element receives the Frame of the up link that corresponding antenna receives, and to Frame amplify accordingly, filtering;
Each demodulating unit is finished the demodulation to the received signal of corresponding one road receiving element output in uplink period, in the down link period, finishes the data of transmission channel emission are modulated;
Signal strength signal intensity indication sampling unit is finished the data acquisition to the received signal intensity indication of corresponding receive path, and delivers to controlled processing unit;
Controlled processing unit is finished processing, the antenna of receiving and transmitting signal and is chosen, and control receives emission change over switch, antenna duplexer conversion;
Transmitter unit was launched the Frame that modulates by modulating unit in the down link period by corresponding antenna.
The quantity of described multipath reception passage comprises more than two the road or two the tunnel at least.
Mounting distance in the described receive path between the antenna of two adjacent passages is greater than 7 λ.
In the technical solution of the present invention, its method combines selective reception diversity technique in the radio base station, adopt at least two receive path received signals, indication of received signal intensity and signal quality to a plurality of passages of up link are passed judgment on, select the received signal on the optimal channel, as the up link received signal; Simultaneously, with the transmitting antenna of the pairing antenna of this passage as down link, optimum transmit antenna just, got rid of owing to the reason of disturbing, cause received signal intensity on certain antenna to be higher than the received signal intensity of other antenna, make the base station make the mistaken verdict that the pairing path of this antenna promptly is best transmitting-receiving path.Controlled processing unit control whole system operation sequential in its device, control received signal intensity indication sampling, data sampling, also control transmit-receive switch, the execution action of antenna change-over switch, and the received signal on the multichannel antenna is compared by the software that solidifies in this unit, judgement, select the optimum reception antenna, and the control antenna change over switch switched on the transmitting antenna of corresponding optimum in down link working hour, under the prerequisite that increases hardware cost hardly, make the receipts of base station signal, send out and all adopt diversity technique, thereby on the realization base station, following link signal gain balance has improved communication quality.
Description of drawings
Fig. 1 is the typical double antenna of tradition, the selection diversity principle schematic of single reception, single transmit system.
Fig. 2 is base station and the multipath effect schematic diagram of portable terminal in actual communication involved in the present invention.
Fig. 3 a is an embodiment (the two road receive paths) theory diagram of transmission diversity apparatus of the present invention.
Fig. 3 b comprises the theory diagram of N road receive path for transmission diversity apparatus of the present invention.
Fig. 4 is time division multiple access involved in the present invention, the working timing figure of tdd systems.
Fig. 5 is the reception with fixed bit position involved in the present invention, the frame format schematic diagram that transmits
Fig. 6 is the flow chart (having described the overall procedure of a work period) of emission diversity method among the present invention.
Fig. 7 carries out the preselected sub-process figure of transmitting antenna for the present invention according to RSSI.
Fig. 8 software flow of the present invention is selected the sub-process figure of transmitting antenna once more according to signal quality.
Embodiment
Fig. 2 is base station and the multipath effect schematic diagram of portable terminal in actual communication involved in the present invention.Base station 201 is one and comprises the system that multichannel receives, single channel is launched, the method according to this invention and device, base station 201 can be different portable terminal (as 204,205) best sending and receiving antenna is provided respectively, with the signal fadeout that causes owing to multipath transmisstion in effective containment wireless telecommunications, improve communication quality.When a certain portable terminal 204 or 205 positions are moved, base station 201 can be handled, adjudicate the indication of received signal intensity and the signal quality of different antennae up link, adjust and select antenna, guaranteeing all the time provides best sending and receiving path for portable terminal in real time.
For the simplified schematic explanation, only illustrated to that is to say two antennas that only comprise two receive paths in the schematic diagram, in fact the present invention is applicable to the communication system of multipath reception passage, single transmit passage among this figure.
For convenience of explanation, below earlier device of the present invention is described,
Please consult Fig. 3 a earlier, this illustrates the theory diagram (for core content of the present invention is described, the critical component of the problem that can illustrate has drawn among the figure) of an embodiment of apparatus of the present invention.Equally, for simplified schematic, explanation, two-way receive path, single transmit channel system have all only drawn in the schematic diagram among the figure.
In up link working hour, the base station is in accepting state.Controlled processing unit 309 control sending and receiving change over switches 313 are thrown to receiving position.Reception data on the antenna 301 enter first receiving element 303 by switch 313.The signal that 303 butt joints of first receiving element take in amplifies, filtering, delivers to first demodulating unit 305 of back then; Simultaneously, first receiving element also is sent to the indication of received signal intensity first received signal intensity indication (RSSI) sampling unit 307.The data collection task of controlled processing unit 309 controls the one RSSI sampling unit 307, and the sampled data that reads, stores RSSI in this cycle are for subsequent treatment.In addition, controlled processing unit also reads, stores through first demodulating unit (305) demodulated received Frame FRAME1.
The operation principle of second receive path is identical with first receive path.Processor controls unit 309 control transmit-receive switches 314 are thrown to receiving position.Reception data on the antenna 302 enter by switch 314 that the signal that the butt joint of second receiving element, 304, the second receiving elements 304 takes in amplifies, filtering, deliver to second demodulating unit 306 of back then; Simultaneously, second receiving element also is sent to the 2nd RSSI sampling unit 308 with the indication of received signal intensity.The data collection task of controlled processing unit 309 controls the 2nd RSSI sampling unit 308, and the sampling phase sampler data that read, store RSSI in this cycle are for subsequent treatment.In addition, controlled processing unit also reads, stores through second demodulating unit (306) demodulated received Frame (FRAME2).
At down link working hour, controlled processing unit 309, control sending and receiving change over switch 313,314 is thrown to transmitting site; And control antenna selector switch 312, it is thrown on the transmitting antenna of having selected (selection of transmitting antenna is to be finished by controlled processing unit, sees the software processing method and the flow process of back for details).In addition, the signal frame that controlled processing unit 309 will be launched is given modulating unit 310 and is modulated, and modulating unit 310 will be given transmitter unit 311 through the signal after the modulation, and 311 pairs of transmitter units will transmit and amplify, and send on the corresponding antenna.
System's (seeing Fig. 3 b) of above-mentioned principle can extend to n road receiver (receive path) 300, riches all the way letter machine (transmission channel) 300 '
Fig. 4 illustrates typical time division multiple access (TDMA) involved in the present invention, time division duplex (TDD) working timing figure.A complete work period is made up of adjacent a down link and a up link.The down link period, base station, portable terminal receives; Uplink period, the base station receives, the portable terminal emission.401,402,403,404 4 time slots (slot) are down link among the figure, and 405,406,407,408 4 time slots (slot) are up link.
In addition, 401 and 405 be respectively down link, the up link of a communication channel among Fig. 4.Same 402 and 406 is respectively down link, the up link of a communication channel; 403,407 is respectively down link, the up link of a communication channel; 404,409 is respectively down link, the up link of a communication channel.Up link on communication channel and down link use identical reception, tranmitting frequency.
Among Fig. 4 409～412nd, the down link of next work period.
Fig. 5 is for the typical case with fixed bit position involved in the present invention receives, frame format transmits.Signal frame form of the present invention must have the fixed bit position.Certainly, the Frame of different system, its fixed bit figure place can be different, so the present invention is applicable to the different system with fixed bit bit data frames.
In the antenna selecting method used in the present invention; when determining transmitting antenna according to received signal quality; require in the signal frame also must to comprise check code 504 parts such as information code 503, rising, bit preamble 501, guard bit 505 except necessity, unique identifier word 502 is optional information positions.
After having described said apparatus of the present invention, again method of the present invention is described again below:
Please continue to consult shown in Figure 6,
Work period begins (step 601),
Read, also store through the N road received signal Frame (step 602) after the demodulation;
Read and the sampled data (step 603) of this cycle of storage N road received signal intensity indication.
Carry out transmitting antenna preselected (step 604) according to the size of each receive path RSSI.
According to the quality of received signal, carry out day line options (step 605) once more, with definite final selection antenna, and definite transmitting antenna (step 607) as next work period down link.
Each top step is finished by the controlled processing unit among Fig. 3 309.
Fig. 7 has described the process of carrying out the preselected part of transmitting antenna (step 604) among Fig. 6 according to RSSI in more detail.
Controlled processing unit 309 RSSI to each passage in one-period repeatedly samples, to guarantee the reliability of sampled data.In the process of Fig. 7, at first a plurality of sampled values to each receive path average (step 701), obtain RSSI1, RSSI2 ... RSSIN; Then to the average received signal strength of each passage indication RSSI sort from big to small (step 702); Choose the pre-transmitting antenna (step 703) of antenna conduct on the maximum RSSI institute respective channel.
Fig. 8 has described the flow process of selecting transmitting antenna part (605) among Fig. 6 according to signal quality once more in more detail.
A channel counter I at first is set, and it is worth corresponding receive path number.The initial value that I is set is 1 (step 801);
Read the received signal Frame (step 802) on the pre-selected antenna;
Extract unique identifier word (step 803) corresponding in this Frame, referring to the unique identifier word 502 among Fig. 5;
Judge the unique identifier word whether correct (step 804) in this frame signal,, illustrate that this signal quality has passed through first step judgement, can carry out the further quality judgement in back if correct.
After having passed through first step judgement, just can carry out the judgement of second step.Promptly extract the check code (step 805) in this frame signal, can be referring to the check code among Fig. 5 504; This frame signal is carried out verification; The check code of check results and reception is compared, and correctly whether judged result (step 806).If the result is correct, illustrate that this signal quality has passed through the judgement of second step, determines that the pairing antenna of this passage is final transmitting antenna (811); If check results is incorrect, verification twin check result jumps to the Frame that the next one is had on time strong RSSI passage and carries out the quality judgement.
The judgement of signal quality is not passed through, even the RSSI value is very high, illustrates on this passage and to cause the reception error in data on this passage owing to reasons such as interference, multipath fadings.To abandon the selection to this passage this moment, and flow process adds 1 (step 807) to channel counter; Changing pre-selected antenna is the antenna (step 809) of the stronger RSSI receive path correspondence of the next one; And then the data on this pre-selected antenna are carried out quality judgement, repeat above each step 802,803,804,805,806 etc.So repeat, up to determining final transmitting antenna (step 811).
If the signal quality on N receive path is all bad, be the I＞N in the step 808, this moment process to select final transmitting antenna be the antenna of the passage correspondence of RSSI maximum, simultaneity factor can be taked other measure, carry out frame processing by mistake accordingly, as switching methods such as frequency, switching time slot.
More than first step judgement that signal quality is carried out, promptly the judgement to unique identifier word is an option.Can accept or reject it according to concrete communication system; And the judgement in second step, promptly the judgement to check results is necessary, certainly, the type of check code can be according to different systems and difference, as cyclic redundancy check (CRC) etc.
Method of the present invention and device also have the following advantages:
First: be to adopt the portable terminal feedback information in the conventional art, the present invention does not need the portable terminal feeding back antenna to select information, can reduce the hardware cost of portable terminal.
Second: the present invention adopts multipath reception, and each passage is wherein all carried out the signal quality judgement.Compare with foregoing traditional single channel selecting type reception, method therefor of the present invention and device can not lost effective information, can not produce the risk of " switch to and may it would be better current channel signal quality ", and what select must be " the best " antenna-path.With this as down link select transmitting antenna compared with traditional single channel receives, single channel emission selection diversity system is reliable.
The 3rd: the present invention, has also increased quality to received signal and has judged except traditional RSSI is adjudicated carrying out optimal antenna when judgement, can effectively overcome the erroneous judgement that some interference cause and determine, falsely drops and select.With uses the method for signal receiving strength (RSSI) in the aforementioned institute patent merely as criterion, the sky line options is more credible, more reliable.
The the 4th: the transmit diversity techniques that the present invention adopts and the combination of reception diversity technology, under the prerequisite that increases hardware cost hardly, make the sending and receiving of base station all adopt diversity technique, thereby realize the upper and lower link signal gain balance of base station, effectively increased wireless communication distance.
The 5th: the inventive method can make the decline that is caused by multipath transmisstion reduce greatly simultaneously for different portable terminals provides best dual-mode antenna with device; And variation along with certain mobile terminal locations, the base station can be adjudicated dual-mode antenna automatically, selects best dual-mode antenna for this portable terminal in real time, has significantly reduced terminal when communication, since multipath fading and " switching to other base station " time, improved communication quality.
Claims (9)
1, a kind of real-time antenna is selected emission diversity method, and this method is characterized in that based on comprising in the base station that multichannel receives, single channel is launched this method may further comprise the steps:
A reads, stores in the work period through the received signal Frame on the N road receive path after the demodulation by controlled processing unit;
B reads, stores the sampled data that the received signal intensity on the receive path of N road is indicated in this cycle again;
C according to the signal strength indication value that is received on each receive path, chooses and has maximum received signal strength and indicate pairing antenna, as the preliminary election transmitting antenna;
D adjudicates the quality of pre-selected antenna received signal, and emitting antenna selecting is determined final selection transmitting antenna once more, as the transmitting antenna of next down link period work period.
2, real-time antenna as claimed in claim 1 is selected emission diversity method, it is characterized in that described step b further may further comprise the steps:
B1, controlled processing unit is repeatedly sampled to the signal strength indication value to each passage in the one-period;
B2 averages a plurality of sampled values of each receive path, obtains one group of signal strength indication value RSSI1, RSSI2 ... RSSIN.
3, real-time antenna as claimed in claim 1 is selected emission diversity method, it is characterized in that, during described step c preliminary election transmitting antenna, elder generation is to average received signal strength indicated value RSSI1, the RSSI2 of each passage ... RSSIN sorts from big to small, chooses the pre-transmitting antenna of antenna conduct on the maximum signal strength indication value institute respective channel again.
4, real-time antenna as claimed in claim 1 is selected emission diversity method, it is characterized in that described steps d further may further comprise the steps:
D1 at first is provided with a channel counter I, and it is worth corresponding receive path number, and the initial value that I is set is 1;
D2 reads the received signal Frame on the preliminary election transmitting antenna;
D3 extracts unique identifier word corresponding in this Frame;
D4 judges the unique identifier word in this frame signal and the correctness of check code.
5, real-time antenna as claimed in claim 4 is selected emission diversity method, it is characterized in that, in the described steps d 4, when unique identifier word and check code are judged, if unique identifier word is correct, carry out the judgement of second step, promptly extract the check code in this frame signal, this frame signal is carried out verification; The check code of check results and reception is compared, and whether judged result is correct, if the result is correct, illustrates that this signal quality has passed through the judgement of second step, determines that the pairing antenna of this passage is final transmitting antenna; If check results is incorrect, verification twin check result jumps to the Frame that the next one is had on time strong signal strength signal intensity indication passage and carries out the quality judgement.
6, real-time antenna as claimed in claim 5 is selected emission diversity method, it is characterized in that, and is obstructed out-of-date when the judgement of signal quality, carries out following steps successively again:
With the selection of abandoning this passage, make channel counter add 1;
Changing pre-selected antenna is the pairing antenna of receive path that next stronger signal strength signal intensity is indicated;
And then the data on this pre-selected antenna are carried out quality adjudicate, repeat steps d 2, the above flow process of d3, d4 in the claim 4, so repeat, up to determining final transmitting antenna.
7, a kind of real-time antenna is selected transmission diversity apparatus, it is characterized in that: this device comprises multipath reception passage, a plurality of reception emission change over switch, single channel transmission channel, controlled processing unit, each road receive path contains an antenna that is used for space diversity, a receiving element, a demodulating unit, received signal field intensity indication sampling unit, a transmission channel and contains a transmitter unit, a modulating unit, an emitting antenna selecting switch
Each receiving element receives the Frame of the up link that corresponding antenna receives, and to Frame amplify accordingly, filtering;
Each demodulating unit is finished the demodulation to the received signal of corresponding one road receiving element output in uplink period, in the down link period, finishes the data of transmission channel emission are modulated;
Signal strength signal intensity indication sampling unit is finished the data acquisition to the received signal intensity indication of corresponding receive path, and delivers to controlled processing unit;
Controlled processing unit is finished processing, the antenna of receiving and transmitting signal and is chosen, and control receives emission change over switch, antenna duplexer conversion;
Transmitter unit was launched the Frame that modulates by modulating unit in the down link period by corresponding antenna.
8, real-time antenna as claimed in claim 7 is selected transmission diversity apparatus, and it is characterized in that: the quantity of described multipath reception passage comprises more than two the road or two the tunnel at least.
9, select transmission diversity apparatus as claim 7 or 8 described real-time antennas, it is characterized in that: the mounting distance in the described receive path between the antenna of two adjacent passages is greater than 7 λ.
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| CN100471086C (en) * | 2005-07-27 | 2009-03-18 | 北京邮电大学 | Method for selecting send-antenna through closed-loop control in multi-antenna system |
| WO2009152695A1 (en) * | 2008-06-20 | 2009-12-23 | 大唐移动通信设备有限公司 | Distributed antenna system and its data transmission method and central controller |
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| CN107258058A (en) * | 2015-02-27 | 2017-10-17 | 伯斯有限公司 | The system and method for antenna diversity switching |
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2002
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