CN103152089A - Wireless transmission method, wireless transmitter and wireless receiver - Google Patents
Wireless transmission method, wireless transmitter and wireless receiver Download PDFInfo
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- CN103152089A CN103152089A CN2013100755331A CN201310075533A CN103152089A CN 103152089 A CN103152089 A CN 103152089A CN 2013100755331 A CN2013100755331 A CN 2013100755331A CN 201310075533 A CN201310075533 A CN 201310075533A CN 103152089 A CN103152089 A CN 103152089A
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Abstract
The invention provides a wireless transmission method, a wireless transmitter and a wireless receiver. According to the wireless transmitter (1), the number of sent beams is controlled according to the number of data flows which should be transmitted, wherein the number of the sent beams is formed by transmitting the data flows. The wireless receiver (2) is used for selectively receiving at least one arbitrary sent beam of the sent beams. Through changing the formed number of the sent beams according to the number of the transmitted data flows in such a manner, the high throughput feature based on relevancy among low beams when multi-flow transmission is performed and high directional gain when single-flow transmission is performed can be realized.
Description
The application is to be that February 2, application number in 2006 are 200680052201.X(international application no PCT/JP2006/301776 the applying date), denomination of invention divides an application for the original bill application of " wireless transmission method, wireless transmitter and wireless receiver ".
Technical field
The present invention relates to wireless transmission method, wireless transmitter and wireless receiver, the technology of particularly using in the wireless tranmission techniques such as the multiple-input and multiple-output that is adapted at using a plurality of dual-mode antennas to carry out the signal transmission in the wireless communication systems such as mobile phone or accessing wirelessly.
Background technology
In recent years, as the technology that can effectively utilize frequency band to carry out large capacity (at a high speed) data communication, just paying close attention to MIMO(Multiple-Input Multiple-Output: multiple-input and multiple-output).MIMO refers to following technology: all use a plurality of antennas at receiving-transmitting sides, even with the transmitter with a plurality of antennas and the receiver with a plurality of antennas, send independently data flow from a plurality of antennas of transmitter, use transfer path (channel) estimated value, the signal that receives from each reception antenna that utilizes receiver, a plurality of transmitted signals (data flow) of mixing on transfer path are separated respectively, thereby need not extending bandwidth, can improve transfer rate.
Fig. 8 illustrates the structure example of existing MIMO transfer system.this system shown in Figure 8 is equivalent to the system shown in the Fig.1 of aftermentioned non-patent literature 1, possesses MIMO transmitter 100 and MIMO receiver 200 consists of, pay close attention to respectively major part as follows: MIMO transmitter 100 possesses user's selection portion 101, chnnel coding/modulator 102, beam selection section 103, multi-beam shaper (Multi-beam former) 104, scheduler (Scheduler) 105, and a plurality of transmitting antennas 106 consist of, MIMO receiver 200 possesses a plurality of reception antennas 201, MIMO/SIMO demodulator 202, channel decoder 203, send wave beam determination part 204, and transmission wave beam/stream determination portion 205 consists of.
and, in MIMO transmitter 100, user's selection portion 101 is under the control of scheduler 105, select the customer traffic more than 1 that should transmit among the customer traffic of a plurality of sequences, be input to chnnel coding/modulator 102, this chnnel coding/modulator 102 is under the control of scheduler 105, implement the error correction coding of the necessity such as Turbo coding with the encoding rate of appointment after, resulting bit sequence is mapped to the modulation system with appointment, quadrature amplitude modulation) etc. quarternary phase-shift keying (QPSK)) or 16QAM(Quadrature Amplitude Modulation such as QPSK(Quadrature Phase Shift Keying:: the symbol (signal of data channel) of signaling point, modulate.In addition, in this chnnel coding/modulator 102, except the signal of data channel, also signal (control character) of the control channel of the signal (frequency pilot sign) of the pilot channel that uses in channel estimating, communicating control information etc. is carried out multiplexing process.
The modulating data that obtains like this is imported into beam selection section 103, beam selection section 103 is under the control of scheduler 105, among a plurality of fixed beams (multi-beam) that utilize 104 formation of multi-beam shaper, select the wave beam that is used for transmitting this modulating data that the fluxion that will transmit is divided, utilize selected wave beam, send described modulating data from transmitting antenna 106.
For example, the quantity of supposing transmitting antenna 106 is 4, can be to the maximum in the situation of 4 wave beams by the fixed beam number that multi-beam shaper 104 forms, and when the fluxion that transmit is 4, selects whole 4 wave beams; When being 2, select 2 wave beams among 4 wave beams; When being 1, select 1 wave beam among 4 wave beams.
On the other hand, in MIMO receiver 200, the wireless signal that sends from the transmitting antenna 106 of MIMO transmitter 100 is received by each reception antenna 201, carried out MIMO demodulation or SIMO(Single-Input Multi-Output by MIMO/SIMO demodulator 202: the many outputs of single input) demodulation generates customer traffic.Namely, in MIMO/SIMO demodulator 202, according to the channel estimation value (channel matrix) of being obtained by the degree of correlation computing between the described frequency pilot sign that receives and pilot tone copy, the method of the inverse matrix by having used the channel correlation matrix, use MLD(Maximum Likelihood Detection: the maximal possibility estimation) method of algorithm etc., isolate the customer traffic multiplexing to each transmitting antenna 106, the generating solution adjusting data.
The demodulating data that obtains is imported into channel decoder 203, implements error correction decoding such as Turbo decoding grade in this channel decoder 203, thereby obtains the decoded data of the customer traffic that receives by data channel.
In addition, utilize each signal that reception antenna 201 receives also to be imported into respectively transmission wave beam determination part 204, be CQI value (Channel Quality Indicator: CQI) according to the index that receives the frequency pilot sign mensuration quality of reception in sending wave beam determination part 204, according to resulting CQI value, determine the best wave beam more than 1 of (selection) quality of reception in sending wave beam/stream determination portion 205.And as the feedback information to MIMO transmitter 100, generation comprises definite numbers of beams, the CQI value of correspondence and the information of wave beam ID, sends to MIMO transmitter 100.
Above-mentioned feedback information finally is notified to the scheduler 105 of MIMO transmitter 100, thereby scheduler 105 is controlled user's selection portions 101, chnnel coding/modulator 102 and beam selection section 103, in order to send wave beam/stream determination portion 205 with MIMO receiver 200() wave beam of the numbers of beams (wave beam ID) of definite (selection), and encoding rate, modulation system according to corresponding with report CQI value send customer traffic as described above.
In addition, patent documentation 1 is also once disclosed such as described later, carry out in the MIMO load mode of closed-loop type of precoding at transmitter side, as the feedback information to transmitter side, also need the channel matrix that foldback obtains at receiver side or receive weight (weight coefficient of multi-beam).
[patent documentation 1] TOHKEMY 2005-311902 communique
[non-patent literature 1] 3GPP TSG RAN WG1meeting#43(R1-051438), " Multi-beam MIMO for EUTRA Downlink ", Fujitsu, in November, 2005
In order to improve the transfer rate of the multiplexing method of MIMO, require (1) higher SNR(Signal to Noise Ratio: signal to noise ratio) and (2) hang down the degree of correlation between antenna (or between low wave beam the degree of correlation).In the situation that do not satisfy this condition, the multiplexing throughput characteristic of MIMO is deteriorated significantly, and the way of using MIMO variation or directional wave beam to send is more favourable to the throughput ratio of entire system.
At this, in above-mentioned prior art, to send the numbers of beams that fluxion forms constant (for example owing to not relying on, be fixed as the maximum of the numbers of beams that can form) (in other words, the beamwidth of every 1 wave beam (directive property intensity) is constant), so can not obtain the multiplexing effect of MIMO by the wave beam of selecting, cause the throughput deterioration in characteristics.
For example, by the described feedback information from receiver side, in transmitter side, if select the high wave beam of the degree of correlation (for example, mutual adjacent wave beam), can cause at receiver side, customer traffic separates, and the demodulation process ability is deteriorated.So, as long as select audaciously the low wave beam of the degree of correlation, can suppress to separate, the demodulation process ability deteriorated, but this moment, directive property due to wave beam, for receiver side, than former should be also poor as the quality of reception of the wave beam of the good beam selection of the quality of reception (directional gain).
At this, described in above-mentioned patent documentation 1, if as described feedback information, signal matrix or reception weight that receiver side is used feed back to transmitter side, can adjust and select the degree of correlation or beam direction between wave beam, can alleviate the deteriorated or quality of reception deteriorated of described separation, demodulation process ability, but cause feedback information volume to increase, and processing also requires calculation in order to adjust.
Summary of the invention
The present invention proposes in view of above-mentioned problem, and its purpose is, in MIMO transmits, does not increase feedback information volume, and high-throughput characteristic and high directivity gain balance based on the degree of correlation between low wave beam can access good receiving feature.
In order to achieve the above object, the invention is characterized in, use following wireless transmission method, wireless transmitter and wireless receiver.That is,
(1) wireless transmission method of the present invention, the method can be by multi-beam at the wireless transmitter with a plurality of transmitting antennas with have between the wireless receiver of a plurality of reception antennas and transmit data flow, this wireless transmission method is characterised in that, this wireless transmitter is according to the data fluxion that should transmit, the transmission numbers of beams that forms in order to transmit this data flow is controlled any transmission wave beam more than 1 of this wireless receiver selective reception in described transmission wave beam.
(2) at this, this wireless transmitter preferably carries out following control: described transmission data fluxion is fewer, more increases described transmission numbers of beams.
(3) and, this wireless receiver is preferably in the situation that described transmission data fluxion is more than 2, the described transmission wave beam more than 2 that the selective reception degree of correlation each other is low.
(4) more preferably, the non-conterminous transmission wave beam of this wireless receiver selective reception is as the low transmission wave beam of the described degree of correlation.
(5) and, this wireless transmitter is to each described transmitting antenna pilot signals, by fixing weight coefficient, carrying out wave beam sends, this wireless receiver is according to described pilot signal and described weight coefficient, measure the level of described transmission wave beam, according to its level determination result, definite described transmission data fluxion and described transmission wave beam that should receive, the information relevant with described transmission wave beam with determined described transmission data fluxion is notified to this wireless transmitter, this wireless transmitter is according to the information of notifying from this wireless receiver, control described transmission numbers of beams.
(6) and, this wireless transmitter is to each described transmission wave beam pilot signals, by fixing weight coefficient, carrying out wave beam sends, this wireless receiver is according to described pilot signal, measure the level of described transmission wave beam, according to its level determination result, definite described transmission data fluxion and described transmission wave beam that should receive, the information relevant with described transmission wave beam with determined described transmission data fluxion is notified to this wireless transmitter, this wireless transmitter is controlled described transmission numbers of beams according to the information of notifying from this wireless receiver.
(7) in addition, this wireless transmitter is to each described transmitting antenna pilot signals, by variable weight coefficient, send wave beam, and, with the information relevant with described weight coefficient and the information reporting relevant with described transmission numbers of beams to this wireless receiver, this wireless receiver is according to described pilot signal and the information relevant with described weight coefficient of coming from this wireless transmitter report, measure the level of described transmission wave beam, according to its level determination result and the information relevant with described transmission numbers of beams of coming from this wireless transmitter report, definite described transmission data fluxion and described transmission wave beam that should receive, the information relevant with described transmission wave beam with determined described transmission data fluxion is notified to this wireless transmitter, this wireless transmitter is according to the information of notifying from this wireless receiver, control described transmission numbers of beams.
(8) in addition, wireless transmitter of the present invention, it can pass through multi-beam, and at it and have between the wireless receiver of a plurality of reception antennas and transmit data flow, this wireless transmitter is characterised in that, and described wireless transmitter possesses: a plurality of transmitting antennas; And sending the numbers of beams control unit, it is according to the data fluxion that should transmit from described transmitting antenna, to controlling for transmitting the transmission numbers of beams that this data flow forms.
(9) at this, this transmission numbers of beams control unit constitutes and carries out following control: described transmission data fluxion is fewer, more increases described transmission numbers of beams.
(10) and, this transmitter also possesses: the first pilot frequency multiplexing unit, it is to each described transmitting antenna pilot signals; The first Beam-former, it carries out wave beam and sends by fixing weight coefficient; And the first announcement information receiving element, it receives from the next information relevant with sending wave beam with transmitting the data fluxion of this wireless receiver notice, wherein, described is to determine according to the level determination result that obtains with following method with transmitting the data fluxion and sending the relevant information of wave beam: in this wireless receiver, according to described pilot signal and described weight coefficient, described transmission wave beam is measured, this transmission numbers of beams control unit is controlled described transmission numbers of beams according to the information that this first announcement information receiving element receives.
(11) and, this transmitter also possesses: the second pilot frequency multiplexing unit, it is to each described transmission wave beam pilot signals; The first Beam-former, it carries out wave beam and sends by fixing weight coefficient; And the second announcement information receiving element, it receives from the next information relevant with sending wave beam with transmitting the data fluxion of this wireless receiver notice, wherein, described is to determine according to the level determination result that obtains with following method with transmitting the data fluxion and sending the relevant information of wave beam: in this wireless receiver, according to described pilot signal, described transmission wave beam is measured, this transmission numbers of beams control unit is controlled described transmission numbers of beams according to the information that this second announcement information receiving element receives.
(12) in addition, this transmitter also possesses: the first pilot frequency multiplexing unit, and it is to each described transmitting antenna pilot signals, the second Beam-former, it carries out wave beam and sends by variable weight coefficient, reporting unit, its with the information relevant with described weight coefficient and the information reporting relevant with described transmission numbers of beams to this wireless receiver, and third notice information receiving unit, it receives from the next information relevant with sending wave beam with transmitting the data fluxion of this wireless receiver notice, wherein, described is to determine according to the level determination result that obtains with following method with by the information relevant with described transmission numbers of beams of this report unit report with transmitting the data fluxion and sending the relevant information of wave beam, described method is: in this wireless receiver, according to described pilot signal and the information relevant with described weight coefficient of passing through this report unit report, described transmission wave beam is measured, the information that this transmission numbers of beams control unit receives according to this third notice information receiving unit, control described transmission numbers of beams.
(13) in addition, wireless receiver of the present invention, this wireless receiver can pass through multi-beam, at it and have between the wireless transmitter of a plurality of transmitting antennas, transmit data flow, this wireless receiver is characterised in that, described wireless receiver comprises: a plurality of reception antennas; And beam selection reception control unit, the data fluxion that it should transmit according to this wireless transmitter, to for transmitting in the transmission wave beam that transmission numbers of beams that this data flow forms controls, via described reception antenna, any transmission wave beam more than 1 of selective reception.
(14) at this, the beam selection reception control unit is in the situation that described transmission data fluxion is more than 2, the described transmission wave beam more than 2 that the selective reception degree of correlation each other is low.
(15) and, the non-conterminous transmission wave beam of this beam selection reception control unit selective reception is as the low transmission wave beam of the described degree of correlation.
(16) and, this wireless transmitter is to each described transmitting antenna pilot signals, by fixing weight coefficient, send wave beam, and, this beam selection reception control unit possesses: the first level determination section, and it measures the level of described transmission wave beam according to described pilot signal and described weight coefficient; The first determination portion, it determines described transmission data fluxion and the described transmission wave beam that should receive according to the level determination result of this first level determination section; And first notification unit, its notice with by the definite described transmission data fluxion of this first determination portion information relevant with described transmission wave beam, as the control information of the described transmission numbers of beams in this wireless transmitter.
(17) in addition, this wireless transmitter is to each described transmission wave beam pilot signals, by fixing weight coefficient, send wave beam, and this beam selection reception control unit possesses: the second electrical level determination part, it measures the level of described transmission wave beam according to described pilot signal; The second determination portion, it determines described transmission data fluxion and the described transmission wave beam that should receive according to the level determination result of this second electrical level determination part; And second notification unit, its notice with by the definite described transmission data fluxion of this second determination portion information relevant with described transmission wave beam, as the control information of the described transmission numbers of beams in this wireless transmitter.
(18) in addition, this wireless transmitter is to each described transmitting antenna pilot signals, by variable weight coefficient, send wave beam, and with the information relevant with described weight coefficient and the information reporting relevant with described transmission numbers of beams to this wireless receiver, and this beam selection reception control unit possesses: the 3rd level determination section, it measures the level of described transmission wave beam according to described pilot signal and the information relevant with described weight coefficient of reporting from this wireless transmitter; The 3rd determination portion, it determines described transmission data fluxion and the described transmission wave beam that should receive according to the level determination result of the 3rd level determination section with from the information relevant with described transmission numbers of beams of this wireless transmitter report; And third notice section, its notice with by the definite described transmission data fluxion of the 3rd determination portion information relevant with described transmission wave beam, as the control information of the described transmission numbers of beams in this wireless transmitter.
The invention effect
According to the invention described above, can access at least following any effect.
(1) owing to according to the data fluxion that should transmit, the transmission numbers of beams (numbers of beams of selectable transmission source) that will form is controlled (change) in transmitter, so do not increase the feedback information volume from the receiver to the transmitter, can obtain good throughput characteristic (receiving feature) yet.
(2) for example, be controlled to be, transmit the data fluxion fewer, more increase when sending numbers of beams, transmit the data fluxion fewer, selectable transmission source numbers of beams is more, so can access the high directivity gain.
(3) and, be more than 2 in the situation that transmit the data fluxion, as long as low (for example, non-conterminous) transmission wave beam more than 2 of the selective reception degree of correlation each other, just can avoid the data stream separation performance degradation of receiver side, can access the high-throughput characteristic based on the degree of correlation between low wave beam.
Description of drawings
Fig. 1 is the figure for explanation embodiments of the present invention summary.
Fig. 2 is the block diagram that the structure of the MIMO transfer system that the first execution mode of the present invention relates to is shown.
Fig. 3 illustrates to pay close attention to transmission wave beam ID/ stream determination portion and the known block diagram of selecting the structure of beam memories shown in Figure 2.
Fig. 4 is the flow chart be used to the action (beam selection method) that transmission wave beam ID/ stream determination portion shown in Figure 3 is described.
Fig. 5 illustrates the schematic diagram of the example that can select wave beam for the action that MIMO transfer system shown in Figure 2 is described.
Fig. 6 is the block diagram that the structure of the MIMO transfer system that the second execution mode of the present invention relates to is shown.
Fig. 7 is the block diagram that the structure of the MIMO transfer system that the 3rd execution mode of the present invention relates to is shown.
Fig. 8 is the block diagram that the structure of existing MIMO transfer system is shown.
Description of symbols
The 1MIMO transmitter; 11 user's selection portions; 12 chnnel codings/modulator; 13 beam selection sections; 14 multi-beam shapers; 15 schedulers (wave beam control part) (sending the numbers of beams control unit, first, second, third announcement information receiving element); 16-1～16-n transmitting antenna; 17 element pilot frequency multiplexing sections (first pilot frequency multiplexing unit); 17-1～17-n adder (multiplex circuit); 17a wave beam pilot frequency multiplexing section (second pilot frequency multiplexing unit); 17a-1～17a-m adder (multiplex circuit); 18 report information appendix (reporting unit); 19a weight generating unit; 19b can select wave beam Information generation section; The 2MIMO receiver; 20 beam selection reception control units; 21-1～21-M reception antenna; The 22MIMO/SIMO demodulator; 23 decoders (channel decoder); 24 send wave beam determination parts (first, second, third level determination section); 25 known pilot memories; 26 known Transmit weight memories; 27 send wave beam ID/ stream determination portion (first, second, third determination portion, first, second, third notification unit); 271 arrangement/level comparing sections; The 28 known beam memories of selecting; 281 compare wave beam ID table; 29 report information extraction units; 30-0～30-9 wave beam
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.
[A] summary description
At first, use Fig. 1, the summary of the following execution mode that will illustrate is described.In this Fig. 1,1 expression possesses the MIMO transmitter of a plurality of (being 4 at this) transmitting antenna, and 2 expressions possess the MIMO receiver of a plurality of reception antennas, can between these MIMO transmitters 1 and MIMO receiver 2, utilize the wireless MIMO of carrying out to transmit.In addition, MIMO transmitter 1 for example can be applicable as the base station apparatus of mobile radio communications system, and MIMO receiver 2 also can be applicable as the mobile station apparatus (UE:User Equipment) of this system.Therefore, in the following description, sometimes MIMO transmitter 1 is expressed as base station apparatus 1 or base station 1, MIMO receiver 2 is expressed as mobile station apparatus 2 or mobile radio station 2.And, for detail specifications, according to for example table of described non-patent literature 1 (Table) A1.
And, in this example, base station apparatus 1 constitute can change (control) according to should send (transmission) customer traffic (below, sometimes referred to as " send stream ") quantity form the numbers of beams of (wave beam formation), mobile station apparatus 2 constitutes can be from any 1 the above wave beam of selective reception among the multi-beam of above-mentioned numbers of beams.
For example, in base station 1, send fluxion when less, namely minimum is single current, and at this moment, mobile radio station 2 selective reception among the more wave beam of base station 1 formation is for example the wave beam of incoming level maximum.And, increase along with sending fluxion, limited selecting beam combination.When the transmission fluxion was more, in the situation of the multithread that maximum transmission is corresponding with number of transmit antennas part, the selective reception element sent the wave beam of (also can be interpreted as selecting numbers of beams to be only 1).
In addition, in Fig. 1, it is that the situation of 4 streams, situation, (3) that (2) are 2 streams are the situation of 1 stream that (1) transmission stream is shown respectively in base station 1, (1) in situation, base station 1 utilizes each transmitting antenna to form 1 wave beam, utilize this wave beam element to send 4 streams, on the other hand, mobile radio station 2 directly receives the signal that (not selecting wave beam) sends with 1 wave beam element; (2) in situation, base station 1 forms 4 wave beams, utilizes these 4 wave beams to send 2 streams, and on the other hand, mobile radio station 2 is selective reception 2 low wave beams of the degree of correlation between wave beam for example among these 4 wave beams; (3) in situation, base station 1 forms 8 wave beams, utilizes these 8 wave beams to send 1 stream, on the other hand, and mobile radio station 21 wave beam of selective reception among these 8 wave beams.
Like this, according to sending fluxion, change becomes the optional transmission numbers of beams of selecting the numbers of beams in source, namely forming (wave beam formation), thereby when single current, can access large as far as possible gain, and, when multithread, carry out beam selection, make between wave beam the degree of correlation low, thereby can access good throughput characteristic, directional gain.
Below, be described in detail concrete example.
The explanation of [B] first execution mode
Fig. 2 is the block diagram that the structure of the MIMO transfer system that the first execution mode of the present invention relates to is shown, this MIMO transfer system shown in Figure 2 possesses MIMO transmitter 1 and MIMO receiver 2 consists of, the major part of paying close attention to separately is as follows: MIMO transmitter 1 possesses user's selection portion 11, chnnel coding/modulator 12, beam selection section 13, multi-beam shaper 14, scheduler (wave beam control part) 15, a plurality of transmitting antenna 16-1～16-n(n are the integer more than 2), and element pilot frequency multiplexing section 17 consists of, it is integer more than 1 that MIMO receiver 2 possesses one or more reception antennas 21-1～21-M(M, and can be M=n), MIMO/SIMO demodulator 22, decoder (channel decoder) 23, send wave beam determination part 24, known pilot memory 25, known Transmit weight memory 26, send wave beam ID/ stream determination portion 27, and the known beam memories 28 of selecting consists of.In addition, below, MIMO transmitter 1 is called " transmitter 1 " or " transmitter side 1 " sometimes for short, and MIMO receiver 2 is called " receiver 2 " or " receiver side 2 " sometimes for short.
At this, in MIMO transmitter 1, user's selection portion 11 is used under the control of scheduler 15, among the customer traffic of a plurality of sequences, and the customer traffic more than 1 that selection should transmit; Chnnel coding/modulator 12 is used under the control of scheduler 15, implement the necessary error correction codings such as Turbo coding with the encoding rate of appointment, the bit sequence that obtains is mapped to have the specified modulation mode, such as QPSK(Quadrature Phase Shift Keying) or 16QAM(Quadrature Amplitude Modulation) etc. on the symbol (signal of data channel) of signaling point, modulate.
Multi-beam shaper (the first Beam-former) 14 is used for being formed for transmitting the multi-beam of described transmission stream according to predetermined Transmit weight matrix (weight coefficient) W.In addition, in this example, described Transmit weight matrix W is fixed.
Element pilot frequency multiplexing section (first pilot frequency multiplexing unit) 17 is by transmitting antenna 16-1～16-n adder (multiplex circuit) 17-1～17-n separately, to each transmitting antenna 16-i(i=1～n), multiplex orthogonal pilot signal (symbol) pi, thereby to each transmitting antenna 16-i(element) transmission orthogonal pilot signals pi.
Wave beam control part (scheduler; Send the numbers of beams control unit) 15 by the beam selection in above-mentioned beam selection section 13 is controlled, thereby according to sending fluxion, to controlling for transmitting the transmission numbers of beams that this transmission stream forms, in this example, the information relevant with fluxion with the wave beam ID that is determined (selection) by the transmission wave beam ID/ stream determination portion 27 of receiver side 2 is received as feedback information, according to this feedback information, control the wave beam (the transmission numbers of beams of formation) that sends fluxion and be used for transmitting this transmission stream.
on the other hand, in receiver 2, reception antenna 21-j(j=1～M) for receiving the wave beam that sends from each transmitting antenna 16-i of transmitter 1, the signal that 22 couples of each reception antenna 21-j of MIMO/SIMO demodulator receive carries out MIMO demodulation or SIMO demodulation, according to the channel estimation value (channel matrix) of being obtained by the degree of correlation computing between multiplexing to received signal pilot signal pi and pilot tone copy, the method of the inverse matrix by using the channel correlation matrix or use the method etc. of MLD algorithm, isolate the customer traffic multiplexing to each transmitting antenna 16-i, the generating solution adjusting data.
The copy signal of known pilot memory 25 pre-stored described pilot signal pi (pilot tone copy), the information of the Transmit weight matrix W of the pre-stored transmitter side 1 of known Transmit weight memory 26, send wave beam determination part (first level determination section) 24 according to the information of the Transmit weight matrix W of storage in the pilot tone copy of storage in these known pilot memories 25 and known Transmit weight memory 26, measure the level from each wave beam of transmitter 1.
The known pre-stored information relevant to selecting wave beam of beam memories 28 of selecting, for example shown in Figure 3 in the present embodiment, storage will send the comparison wave beam ID table 281 that fluxion and candidate wave beam ID are mapped.In addition, in comparison wave beam ID table 281 shown in Figure 3, send fluxion and be in 4 situation, can select wave beam candidate (candidate wave beam) to be 1 wave beam of ID=0; Be 2 in the situation that send fluxion, the ID of candidate wave beam is 2,4,6,8(or also can be 1,3,5,7), that is, and non-conterminous 4 wave beams of even number (or odd number) ID; Send fluxion and be in 1 situation, the ID of candidate wave beam is 9 wave beams of 1～9.
send wave beam ID/ stream determination portion (the first determination portion) 27 according to the measurement result that sends wave beam determination part 24 and the known canned data in beam memories 28 (relatively wave beam ID table 281) of selecting, determine and to pass to transmitter 1 as feedback information, send numbers of beams for sending wave beam ID() and the information (beam selection information) of transmission fluxion, in this example, for example shown in Figure 3, possesses arrangement/level comparing section 271, in this arrangement/level comparing section 271, according to the mensuration level that sends each wave beam (ID) that wave beam determination part 24 is measured to (Level[ID]), the threshold value corresponding with sending fluxion (k) (TH[k]), the content that compares wave beam ID table 281, from sending the many sides of fluxion, check successively possibility, thereby determine to send fluxion and the wave beam ID of this moment.In addition, in Fig. 3, illustrate maximum send fluxion be 4(namely, k=1～4) time example.
Namely, by above-mentioned transmission wave beam determination part 24, known pilot memory 25, known Transmit weight memory 26, send wave beam ID/ stream determination portion 27 and the known effect of selecting module 20 that beam memories 28 consists of to play following beam selection reception control unit: controlled among the transmission wave beam that flows the transmission numbers of beams that forms for transmitting this transmissions according to sending fluxion from utilizing transmitter 1, via reception antenna 21-j, any transmission wave beam more than 1 of selective reception.
In addition, by sending the definite information of wave beam ID/ stream determination portion 27, send as the wave beam control part 15 that is used for transmitter 1 control information that wave beam is controlled (formation numbers of beams), by the transmitting system of not shown receiver 2, feedback (notice) is given transmitter 1.Therefore, transmitter 1(wave beam control part 15) move according to above-mentioned control information (feedback information), thereby beam selection section 13 and multi-beam shaper 14 are controlled to, send fluxion fewer, more increase and send numbers of beams, when sending fluxion and be maximum, beam selection section 13 and multi-beam shaper 14 are controlled to, carry out element with 1 wave beam of wave beam ID=0 and send.
Below, be described in detail the action (beam selection method) of the MIMO transfer system of the present embodiment that consists of as mentioned above.
At first, in transmitter 1, as Transmit weight (matrix) W of multi-beam, use constant all the time fixed weight, each transmitting antenna 16-i multiplex orthogonal pilot signal pi is sent.That is, user's selection portion 11 is selected the customer traffic more than 1 that should transmit among the customer traffic of a plurality of sequences under the control of scheduler 15, be input to chnnel coding/modulator 12; This chnnel coding/modulator 12 is under the control of scheduler 15, after implementing the necessary error correction coding such as Turbo coding with the encoding rate of appointment, the symbol (signal of data channel) that the bit sequence that obtains is mapped to the signaling points such as (QPSK or 16QAM) that has the specified modulation mode is modulated.
Resulting modulating data is input to beam selection section 13, beam selection section 13 is under the control of scheduler 15, among a plurality of fixed beams (multi-beam) that form by multi-beam shaper 14, only select the wave beam that is used for transmitting this modulating data of quantity part corresponding with the fluxion that will transmit, described modulating data sends from transmitting antenna 16 by selected wave beam.At this moment, it is multiplexing that each transmitting antenna 16-i utilizes each adder 17-i of element pilot frequency multiplexing section 17 that orthogonal pilot signals pi is carried out, and send.
On the other hand, in receiver 2, utilize each reception antenna 21-j to receive the signal that utilizes multi-beam to send from above-mentioned transmitter 1, be input to respectively MIMO/SIMO demodulator 22 and send wave beam determination part 24.In MIMO/SIMO demodulator 22, the reception signal from each reception antenna 21-j is carried out MIMO demodulation or SIMO demodulation, generate customer traffic.That is, according to channel estimation value (signal matrix), separate users data flow, generating solution adjusting data.
The demodulating data that obtains is implemented the Turbo decoding by decoder 23 and is waited error correction decoding, thereby obtains the decoded data of customer traffic.
With respect to this, in sending wave beam determination part 24, according to the information of the known Transmit weight W in the pilot tone copy in known pilot memory 25 and known Transmit weight memory 26 (below, sometimes be expressed as Transmit weight information W), measure the level of each wave beam.
For example, will send data vector be expressed as X=x1 ... xn ］, with Transmit weight information (matrix) be expressed as W=W1 ... Wm ］ (wherein, m is for sending numbers of beams), pilot vector is expressed as P=［ p1,, pn ］, channel information (matrix) is expressed as H=［ H1, Hn ］, when the reception signal indication of receiver side 2 is Y, receive Y=HP=HWX in receiver side 2.
Therefore, in sending wave beam determination part 24, use known pilot vector P, obtain the channel information H of each element (transmitting antenna 16-i), further, use known Transmit weight information W, obtain HW, thereby can obtain the channel information that respectively sends wave beam, therefore, can according to this channel information, carry out the level determination of each wave beam.
And, the level determination result of resulting each wave beam (ID) (Level[ID]) is imported into and sends wave beam ID/ stream determination portion 27, by arrangement/level comparing section 271, content according to this level determination result, the threshold value corresponding with sending fluxion (k) (TH[k]) and comparison wave beam ID table 281, from sending the many sides of fluxion, check successively possibility, thereby determine to send fluxion and the wave beam ID of this moment.
Namely, for example shown in Figure 4, maximum transmission fluxion is in the situation of 4 streams (wave beam ID=0), arrangement/level comparing section 271 is the level determination Level[ID=0 as a result of wave beam ID=0 at first relatively] and the threshold value TH[k=4 corresponding with sending fluxion k=4], check whether be Level[ID=0]＞TH[k=4] (sending fluxion is the possibility of 4 streams) (step S1).If its result is Level[ID=0]＞TH[k=4], arrangement/level comparing section 271 is defined as sending fluxion k=4 and wave beam ID=0(from the Y path of step S1 to step S2).
on the other hand, be Level[ID=0]≤TH[k=4] situation under, arrangement/level comparing section 271 is from level determination Level[ID=1 as a result], Level[ID=2], Level[ID=3], Level[ID=4] among, select 2 larger ID(IDmax1 of level, IDmax2) (from the N path of step S1 to step S3), compare each level determination Level[ID=IDmax1 as a result], Level[ID=IDmax2] and the threshold value TH[k=2 corresponding with sending fluxion k=2], check level determination Level[ID=IDmax1 as a result], Level[ID=IDmax2] whether all greater than threshold value TH[k=2] (the transmission fluxion is 2 possibility) (step S4).
Its result, if level determination is Level[ID=IDmax1 as a result], Level[ID=IDmax2] all greater than threshold value TH[k=2], arrangement/level comparing section 271 is defined as sending fluxion k=2 and wave beam ID=IDmax1, IDmax2(from the Y path of step S4 to step S5).
On the other hand, if level determination is Level[ID=IDmax1 as a result], Level[ID=IDmax2] any one party or both sides be threshold value TH[k=2] below, arrangement/level comparing section 271 is from level determination Level[ID=1 as a result]～Level[ID9], select maximum ID as IDmax(from the N path of step S4 to step S6), check level determination Level[IDmax as a result] whether greater than the threshold value TH[1 corresponding with sending fluxion k=1] (send fluxion be 1 possibility) (step S7).
If its result is level determination Level[IDmax as a result] greater than threshold value TH[1], arrangement/level comparing section 271 is defined as sending fluxion k=1 and wave beam ID=IDmax(from the Y path of step S7 to step S8); If not like this, be defined as without the distribution that sends fluxion k and wave beam ID (from the N path of step S7 to step S9).
As mentioned above, send wave beam ID/ stream determination portion 27 according to the fluxion that sends request, among the predetermined known wave beam selected, the wave beam ID of the confidence level maximum of selective channel information.
For concrete example, use schematic diagram shown in Figure 5, describe.Following situation shown in this Fig. 5: transmitter 1 is with number of transmit antennas n=4, transmission fluxion k=1～4, and carrying out maximum transmission numbers of beams is 9(wave beam ID=1, and 2 ..., 9) multi-beam send or element sends (ID=0).
As mentioned above, when the transmission fluxion is less, among the different a plurality of wave beams of beam direction, select wave beam.Specifically, be more than 2 when (MIMO transmissions) when sending fluxion k, among the quadrature multi-beam (or multi-beam equivalent with it) as multi-beam, the selection wave beam; When transmission fluxion k is maximum, do not carry out beam selection, directly 1 wave beam of receiving element transmission; When transmission fluxion k is minimum value (k=1) (SIMO transmission), to the quadrature multi-beam (or wave beam equivalent with it) as multi-beam, to be increased to selectable candidate wave beam towards the wave beam that replenishes the direction between this wave beam, thereby from can not select wave beam among the more wave beam that mode that gain descends configures because direction causes.
And as mentioned above, receiver 2(sends wave beam ID/ stream determination portion 27) in the information of the transmission fluxion k that determines and wave beam ID as feedback information, by the transmitting system of not shown receiver 2, be returned to transmitter 1.Namely, in this example, send the double effect of playing the first notification unit of wave beam ID/ stream determination portion 27, this first notification unit is used for the information relevant with the transmission wave beam with determined transmission fluxion is notified as the control information of the transmission numbers of beams that forms in transmitter 1.
In transmitter side 1, from the above-mentioned feedback information of receiver side 2 receiving system by not shown transmitter 1, notice is to wave beam control part 15, wave beam control part 15 is according to this feedback information, user's selection portion 11, chnnel coding/modulator 12, beam selection section 13 is controlled, select to send fluxion and wave beam, the wave beam that sends stream is controlled.
As mentioned above, according to present embodiment, in transmitter side 1, according to sending fluxion, the selectable candidate numbers of beams of receiver side 2 (the transmission numbers of beams of formation) is controlled (change), thereby for example 1 when stream, can send by element and obtain large as far as possible gain; During multithread, can select the lower wave beam of the degree of correlation between wave beam, can not increase the feedback information volume of transmitter 1, high-throughput characteristic and high directivity gain balance based on the degree of correlation between low wave beam can access good throughput characteristic (receiving feature).
(C) explanation of the second execution mode
Fig. 6 is the block diagram that the structure of the MIMO transfer system that the second execution mode of the present invention relates to is shown, this MIMO transfer system shown in Figure 6 also possesses MIMO transmitter 1 and MIMO receiver 2 consists of, with utilize the described structure of Fig. 2 and compare, its difference is, in MIMO transmitter 1, alternative elements pilot frequency multiplexing section 17, in the prime of multi-beam shaper 14 (beam selection section 13 rear class), the wave beam pilot frequency multiplexing 17a of section is set, and, in MIMO receiver 2, need not known Transmit weight memory 26 in the module 20 that plays the effect of beam selection reception control unit.In addition, given inscape with already described symbol same-sign for other, in case of no particular description, consistent or identical with the structural element of having narrated.And, identical with the first execution mode in this example, the Transmit weight information W=of multi-beam shaper 14 W1 ..., Wm ］ and fixing.
At this, the 17a of wave beam pilot frequency multiplexing section (second pilot frequency multiplexing unit) possess with based on adder (multiplex circuit) 17a-1～17a-m corresponding to each output of the transmission numbers of beams (maximum m) of beam selection section 13, by these adders 17a-1～17a-m, to each wave beam in multi-beam, multiplex orthogonal pilot signal p1～pm.
Therefore, send wave beam determination part 25 at receiver side 2() in, even even do not know that the Transmit weight information W(in transmitter side 1 does not possess already described known Transmit weight information-storing device 26), also can be according to the known pilot copy in known pilot memory 25, estimate respectively to send the channel information of wave beam, can carry out the level determination to each wave beam identical with the first execution mode.That is, the transmission wave beam determination part 25 of this example plays the effect of second electrical level determination part, and this second electrical level determination part is used for according to above-mentioned pilot signal (copy), measures the level that sends wave beam.
Therefore, in this example, sending wave beam ID/ stream determination portion 27(arrangement/level comparing section 271) in, adopt and the described algorithm of Fig. 4 (mode that step S1～S9) is identical, according to the known relatively wave beam ID table 281 of beam memories 28(of selecting) in information, carry out and send the corresponding beam selection of fluxion (determine wave beam ID and send fluxion), this information is fed back to transmitter side 1.
Namely, the transmission wave beam ID/ stream determination portion 27 of this example plays the effect of the second determination portion, this second determination portion is used for according to the level determination result as the transmission wave beam determination part 25 of above-mentioned second electrical level determination part, determine the transmission fluxion that should receive and send wave beam, and send the also double effect of playing the second notification unit of wave beam ID/ stream determination portion 27, this second notification unit is used for the transmission fluxion of determining with send the relevant information of wave beam, notifies as the control information of the transmission numbers of beams of transmitter 1.
And, in this case, the wave beam control part 15 of transmitter 1 is the double effect of playing the second announcement information receiving element also, this the second announcement information receiving element is for receiving according to the information relevant with the transmission wave beam with the transmission fluxion of the level determination result of transmission wave beam mensuration being determined as the basis take pilot signal as mentioned above at receiver 2, come from receiver 2 notices, and wave beam control part 15 sends numbers of beams according to this reception information and controls.
Thereby except obtaining the effect and advantage identical with the first execution mode, in this example, receiver side 2 need not known Transmit weight memory 26, so structure and the processing of receiver side 2 can be simplified.
(D) explanation of the 3rd execution mode
Fig. 7 is the block diagram that the structure of the MIMO transfer system that the 3rd execution mode of the present invention relates to is shown, this MIMO transfer system shown in Figure 7 also possesses MIMO transmitter 1 and MIMO receiver 2 consists of, compare with the described formation of Fig. 2, its difference is, in MIMO transmitter 1, rear class in multi-beam shaper 14 is provided with report information appendix 18, and be provided with weight generating unit 19a and can select the wave beam Information generation 19b of section, on the other hand, in MIMO receiver 2, in the module 20 that plays the effect of beam selection reception control unit, also be provided with report information extraction unit 29, simultaneously, need not known Transmit weight memory 26 and the known relatively wave beam ID table 281 of beam memories 28(of selecting).In addition, given inscape with already described symbol same-sign for other, in case of no particular description, consistent or identical with the structural element of having narrated.
At this, in transmitter 1, weight generating unit 19a generate adaptively in multi-beam shaper 14 the Transmit weight information W=that uses W1 ..., Wm ］.That is, this routine Beam-former 14 plays the effect of the second Beam-former, and this second Beam-former adopts variable Transmit weight information W to carry out wave beam and sends.
Can select the wave beam Information generation 19b of section to generate the information (restrictive condition of beam selection) relevant with the wave beam that can utilize receiver side 2 to select, for example generate the information suitable with the content of the described relatively wave beam ID of Fig. 3 table 281.
That is, in this example, can change (control) Transmit weight information W, with according to the Transmit weight information W information (hereinafter referred to as can select wave beam information) relevant with sending the selectable wave beam of fluxion.
Report information appendix (reporting unit) 18 need to be notified these variable informations to receiver side 2, so as the information such as (downgoing line) reporting channel to receiver side 2, additional (multiplexing) is to sending on stream.In addition, the update cycle of report information, namely the update cycle of the Transmit weight information W of weight generating unit 19a, can select update cycle of the wave beam the selected information of the wave beam Information generation 19b of section, can set according to system.
On the other hand, in receiver 2, report information extraction unit 29 is used for extracting described report information (Transmit weight information W and can select wave beam information) from the signal that utilizes 22 demodulation of MIMO/SIMO demodulator, Transmit weight information W among the report information that extracts is delivered to and sends wave beam determination part 24, can select wave beam information to be delivered to and send wave beam ID/ stream determination portion 27.
Therefore, the transmission wave beam determination part 24 of this example can be according to report and utilize the Transmit weight information W of report information extraction unit 29 extractions and the pilot tone copy of known pilot memory 25 from transmitter 1, estimate the signal of each wave beam, and need not already described known Transmit weight memory 26, can similarly measure with the first execution mode the level of each wave beam.That is, the transmission wave beam determination part 24 of this example plays the effect of the 3rd level determination section, and the 3rd level determination section is used for measuring according to pilot signal with from the Transmit weight information W of transmitter 1 report the level that sends wave beam.
And, send wave beam ID/ stream determination portion 27 according to the wave beam the selected information of being extracted by report information extraction unit 29, the level determination result that sends wave beam determination part 24, with the already described corresponding threshold value of transmission fluxion (TH[k]), adopt and the described algorithm of Fig. 4 (mode that step S1～S9) is identical, select and send the corresponding wave beam of fluxion (determine wave beam ID and send fluxion), this information is fed back to transmitter side 1.This means, in receiver 2, the information that can extract according to report information extraction unit 29, the information that structure or renewal and already described comparison wave beam ID table 281 are suitable.
namely, the transmission wave beam ID/ stream determination portion 27 of this example plays the effect of the 3rd determination portion, the 3rd determination portion is used for according to as the level determination result of the transmission wave beam determination part 24 of the 3rd level determination section with from the wave beam the selected information (information relevant with sending numbers of beams) of transmitter 1 report, determine the transmission fluxion that should receive and send wave beam, and, send wave beam ID/ stream determination portion 27 and also play the effect of third notice section, this third notice section is used for determined transmission fluxion with send the relevant information of wave beam, control information as the transmission numbers of beams in transmitter 1 is notified.
And in transmitter 1, the above-mentioned control information (feedback information) of notifying from receiver 2 is received by wave beam control part 15, according to this information, sends wave beam and controls.Namely, the double effect of playing the third notice information receiving unit of this routine wave beam control part 15, this third notice information receiving unit receive as mentioned above in receiver 2 according to take pilot signal and Transmit weight information W by 18 reports of report information appendix as the basis to the level determination result that sends wave beam and measure and the information relevant with sending wave beam with sending fluxion determined by the wave beam the selected information of report information appendix 18 reports, come from these receiver 2 notices, wave beam control part 15 is controlled and is sent numbers of beams according to this reception information.
Therefore, except obtaining the effect and advantage identical with the first execution mode, in this example, can be according to the communication environment between transmitter 1 and receiver 2, change adaptively Transmit weight information W, can select wave beam information, can realize and the corresponding best beam selection of this communication environment, can realize the further raising of throughput characteristic.
In addition, in above-mentioned example, with Transmit weight information W and can select wave beam information both sides as variable information, report to receiver side 2, but can with any one party as variable information, report to receiver side 2.
And, identical with the second execution mode in this example, also can adopt the structure to the multiplexing transmission orthogonal pilot signals of each wave beam.In this situation, as mentioned above, receiver side 2 need not to know Transmit weight information W, so only can select the wave beam information reporting to get final product to receiver side 2.
In addition, from needless to say, the invention is not restricted to above-mentioned execution mode, can in the scope that does not break away from aim of the present invention, implement various distortion.
Utilizability on industry
As mentioned above, according to the present invention, by changing the transmission numbers of beams (at the first numbers of beams of the selectable transmission of receiver side) that will form according to sending fluxion, thereby can realize carrying out with the less feedback information that only is used for beam selection the system of good communication, namely, large directional gain when the high-throughput characteristic based on the degree of correlation between low wave beam when realizing the multithread transmission, single current is so very useful in wireless communication technology field.
Claims (10)
1. wireless communications method, this wireless communications method are used at the wireless transmitter with a plurality of transmitting antennas and have between the wireless receiver of a plurality of reception antennas transmitting data flow, and this wireless communications method comprises the following steps:
, sent to carry out wave beam by fixing weight coefficient each described transmitting antenna pilot signals by described wireless transmitter;
Transmit the quantity of data flow and determine described transmission wave beam according to determining based on the incoming level of described pilot signal and the determined transmission wave beam of described weight coefficient by described wireless receiver;
By described wireless receiver, the information relevant with determined transmission wave beam with the quantity of described transmission data flow is notified to described wireless transmitter; And
Based on the information of being notified by described wireless receiver, control the quantity of described transmission wave beam by described wireless transmitter.
2. wireless communications method according to claim 1, this wireless communications method is further comprising the steps of:
Be formed for transmitting the transmission wave beam of described data flow according to the information of described wireless receiver notice by described wireless transmitter; And
Received the described transmission wave beam that transmits from described wireless transmitter by described wireless receiver.
3. wireless communications method, this wireless communications method is used for having the wireless receiver of a plurality of reception antennas, this wireless receiver receives the data flow that transmits from the wireless transmitter with a plurality of transmitting antennas, wherein this wireless transmitter is carried out the wave beam transmission by fixing weight coefficient, and this wireless communications method comprises the following steps:
According to being carried out the incoming level of the determined transmission wave beam of multiplexing pilot signal by described wireless transmitter based on described weight coefficient and for each described transmitting antenna, determined to transmit quantity and the described transmission wave beam of data flow by described wireless receiver;
By described wireless receiver, the information relevant with determined transmission wave beam with the quantity of described transmission data flow is notified to described wireless transmitter; And
Received the transmission wave beam that is used for transmitting data flow that is formed according to the information of notifying by described wireless transmitter by described wireless receiver, the quantity of wherein said transmission wave beam is controlled based on the information of notifying by described wireless transmitter.
4. wireless communication system that comprises wireless transmitter and wireless receiver, this wireless communication system can carry out data transmission by multiple-input and multiple-output, and this wireless communication system comprises:
Described wireless transmitter, this wireless transmitter comprises:
Beam-former, it forms by fixing weight coefficient and sends wave beam; With
Multiplexer, it is to each described transmitting antenna pilot signals; And
Described wireless receiver, this wireless receiver comprises:
Determining unit, it is according to determine to transmit quantity and the described transmission wave beam of data flow based on the incoming level of described pilot signal and the determined transmission wave beam of described weight coefficient; With
Transmitter, it is sent to described wireless transmitter with the information relevant with determined transmission wave beam with the quantity of described transmission data flow; And
Described wireless transmitter also comprises:
Control unit, this control unit are controlled the quantity of described transmission wave beam based on the information that is transmitted by described transmitter.
5. from having the wireless transmitter receiving data stream of a plurality of transmitting antennas, wherein this wireless transmitter is carried out wave beam by fixing weight coefficient and is sent by multiple-input and multiple-output for wireless receiver, this wireless receiving function, and this wireless receiver comprises:
A plurality of reception antennas;
Determining unit, it is used for determining to transmit quantity and the described transmission wave beam of data flow according to being carried out the incoming level of the determined transmission wave beam of multiplexing pilot signal by described wireless transmitter based on described weight coefficient and for each described transmitting antenna;
Notification unit, it is used for the information relevant with determined transmission wave beam with the quantity of described transmission data flow is notified to described wireless transmitter; And
Receiving element, it is used for receiving the transmission wave beam that is used for transmitting data flow that is formed according to the information of notifying by described wireless transmitter, and the quantity of wherein said transmission wave beam is controlled based on the information of notifying by described wireless transmitter.
6. wireless communications method, this wireless communications method are used at the wireless transmitter with a plurality of transmitting antennas and have between the wireless receiver of a plurality of reception antennas transmitting data flow, and this wireless communications method comprises the following steps:
, sent to carry out wave beam by variable weight coefficient each described transmitting antenna pilot signals by described wireless transmitter;
, determine to transmit the quantity of data flow and determine described transmission wave beam according to the incoming level based on described pilot signal and the determined transmission wave beam of information relevant with described weight coefficient by described wireless receiver;
By described wireless receiver, the information relevant with determined transmission wave beam with the quantity of described transmission data flow is notified to described wireless transmitter; And
Based on the information of being notified by described wireless receiver, control the quantity of described transmission wave beam by described wireless transmitter.
7. wireless communications method according to claim 6, this wireless communications method is further comprising the steps of:
Be formed for transmitting the transmission wave beam of described data flow according to the information of described wireless receiver notice by described wireless transmitter; And
Received the described transmission wave beam that transmits from described wireless transmitter by described wireless receiver.
8. wireless communications method, this wireless communications method is used for having the wireless receiver of a plurality of reception antennas, this wireless receiver receives the data flow that transmits from the wireless transmitter with a plurality of transmitting antennas, wherein this wireless transmitter is carried out the wave beam transmission by variable weight coefficient, and this wireless communications method comprises the following steps:
According to being carried out the incoming level of the determined transmission wave beam of multiplexing pilot signal by described wireless transmitter based on the information relevant with described weight coefficient and for each described transmitting antenna, determined to transmit quantity and the described transmission wave beam of data flow by described wireless receiver;
By described wireless receiver, the information relevant with determined transmission wave beam with the quantity of described transmission data flow is notified to described wireless transmitter; And
Received the transmission wave beam that is used for transmitting data flow that is formed according to the information of notifying by described wireless transmitter by described wireless receiver, the quantity of wherein said transmission wave beam is controlled based on the information of notifying by described wireless transmitter.
9. wireless communication system that comprises wireless transmitter and wireless receiver, this wireless communication system can carry out data transmission by multiple-input and multiple-output, and this wireless communication system comprises:
Described wireless transmitter, this wireless transmitter comprises:
Beam-former, it forms by variable weight coefficient and sends wave beam; With
Multiplexer, it is to each described transmitting antenna pilot signals; And
Described wireless receiver, this wireless receiver comprises:
Determining unit, it determines to transmit quantity and the described transmission wave beam of data flow according to the incoming level based on described pilot signal and the determined transmission wave beam of information relevant with described weight coefficient; With
Transmitter, it is sent to described wireless transmitter with the information relevant with determined transmission wave beam with the quantity of described transmission data flow; And
Described wireless transmitter also comprises:
Control unit, this control unit are controlled the quantity of described transmission wave beam based on the information that is transmitted by described transmitter.
10. from having the wireless transmitter receiving data stream of a plurality of transmitting antennas, wherein this wireless transmitter is carried out wave beam by variable weight coefficient and is sent by multiple-input and multiple-output for wireless receiver, this wireless receiving function, and this wireless receiver comprises:
A plurality of reception antennas;
Determining unit, it is used for determining to transmit quantity and the described transmission wave beam of data flow according to being carried out the incoming level of the determined transmission wave beam of multiplexing pilot signal by described wireless transmitter based on the information relevant with described weight coefficient and for each described transmitting antenna;
Notification unit, it is used for the information relevant with determined transmission wave beam with the quantity of described transmission data flow is notified to described wireless transmitter; And
Receiving element, it is used for receiving the transmission wave beam that is used for transmitting data flow that is formed according to the information of notifying by described wireless transmitter, and the quantity of wherein said transmission wave beam is controlled based on the information of notifying by described wireless transmitter.
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| JP4451198B2 (en) * | 2004-04-23 | 2010-04-14 | 株式会社エヌ・ティ・ティ・ドコモ | Wireless communication system, wireless transmitter and wireless receiver |
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