CN1964218A - A multi-antenna transmission system of wireless signal, method and wireless communication system - Google Patents
A multi-antenna transmission system of wireless signal, method and wireless communication system Download PDFInfo
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- CN1964218A CN1964218A CN 200510101313 CN200510101313A CN1964218A CN 1964218 A CN1964218 A CN 1964218A CN 200510101313 CN200510101313 CN 200510101313 CN 200510101313 A CN200510101313 A CN 200510101313A CN 1964218 A CN1964218 A CN 1964218A
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Abstract
The multi-antenna emission system comprises: a space-time process unit to process input data flow and output multiple frequency-domain signal data flow, a modulation unit for OFDM modulating to output relative time-domain signal flow; a data flow separation unit to select emission antenna group for every time-domain signal flow and allocate data to relative emission antenna group, and a cycle delay emission module to circular delay all time-domain signal flow on antenna groups. This invention can obtain both space and frequency diversity gains.
Description
Technical field
The invention belongs to wireless communication field, relate in particular to a kind of system and method by a plurality of transmitting antenna diversity transmission wireless signals, and the wireless communication system that utilizes this multi-antenna transmission system to realize.
Background technology
Development along with wireless mobile communications, the user has proposed more and more higher requirement to the speed and the service quality of radio communication, but because the shortage of radio spectrum resources has limited further developing of radio communication, on the other hand, the multipath of wireless channel and time-varying characteristics can bring very big infringement to the signal of wherein transmission, and these two in esse problems all become the obstruction of radio communication development.The MIMO of Chu Xianing (Multiple Input Multiple Output, multiple-input and multiple-output) technology has received very big concern because can add the spectrum efficiency and the raising reliability of wireless communication system in recent years, and has been applied in the actual communication systems.Multi-carrier OFDM (Orthogonal Frequency Division Multiplexing in addition, OFDM) technology is also because can be good at overcoming the multipath characteristics of wireless channel and the focus that the characteristics higher than single carrier frequency spectrum efficiency become research, and these two kinds of technology mutually combine becomes key technology in the wireless communication system.
The MIMO technology is the multi-antenna technology of multiple-input and multiple-output, promptly settles a plurality of antennas respectively at the transmitting terminal and the receiving terminal of communication system.It is exactly diversity and multiplexing that the key of MIMO technology is used, and diversity mainly is to obtain space diversity gain by carrying out Space Time Coding at transmitting terminal.A kind of method main and practical in the Space Time Coding is exactly a space-time block code, but aufbauprinciple according to space-time block code, if carrying out the signal of space-time block code is complex signal, be that 2 o'clock encoder bit rates are 1 only then in number of transmit antennas, in addition the encoder bit rate when other number of transmit antennas is all little by 1, moreover postpones bigger.At present and the number of transmit antennas of future broadband wireless communication systems will be 2 or more than 2, but number of transmit antennas is low greater than the encoder bit rate of 2 o'clock space-time block code, postpone to cause it to be not suitable for real system greatly, in the real system by from a plurality of antennas of transmitting terminal, selecting two space-time block codes that carry out two antennas wherein, can be by the antenna of selection at random of open loop, also can come closed loop to select antenna by the feedback of receiving terminal, this be a kind of concrete application of diversity technique in real system.
Multiplexing is to send the several separate data flow simultaneously to be used for improving transmission rate, according to the basic theories of MIMO as can be known, minimum is relevant in the number that sends independent data stream and number of transmit antennas and the reception antenna number, like this descending when carrying out spatial reuse, because the number of transmit antennas of base station is greater than the antenna number of user side, the number that sends independent data stream is less than number of transmit antennas, a kind of method wherein equally also is to select the part antenna to send multiplexing data flow from number of transmit antennas, and selection at random or closed loop feedback that certain mode of selecting also can be open loop are selected antenna.
As from the foregoing, diversity still is multiplexingly all to have the part antenna not send data when carrying out day line options, and antenna also is a kind of resource, and therefore above-mentioned sky line options can cause the waste of antenna resource.
Another kind of scheme is that space-time block code under two antennas and cyclic delay diversity are combined in the prior art, transmitting antenna is divided into two groups, every group of data flow that sends respectively behind the Alamouti coding, and the data flow that sends is carried out the cyclic delay diversity transmission at every group.Because a day line options can be brought certain diversity gain, still the transmitting antenna in this scheme is fixed, and can't obtain the diversity gain that the antenna selection brings.
Summary of the invention
The objective of the invention is to solve the space resources waste that causes the residue antenna in the sky line options that exists in the prior art and fixedly the cyclic shift of transmitting antenna can't obtain the problem that antenna is selected the diversity gain that brings.
In order to realize goal of the invention, the invention provides a kind of multi-antenna transmission system of wireless signal, the corresponding a plurality of transmitting antennas of described system are used for input traffic is sent by described a plurality of transmitting antennas, and described system comprises:
Processing unit when empty is handled when being used for that input traffic carried out sky, exports a plurality of frequency-region signal data flow;
Modulating unit is used for described frequency-region signal data flow is carried out OFDM modulation, the time-domain signal data flow that output is corresponding;
The data stream separation unit is used to select the transmitting antenna group of each time-domain signal data flow correspondence, and with described time-domain signal distribution of flows on the transmitting antenna group of correspondence, the total number of the antenna of described a plurality of transmitting antenna groups equals number of transmit antennas;
The circulation delay sending module is used for that described time-domain signal data flow is carried out circulation delay on all transmitting antennas of the transmitting antenna group of correspondence and sends.
Described circulation delay sending module further comprises:
The data flow replication module is used for time-domain signal data flow replication all transmitting antennas to corresponding transmitting antenna group;
Circular shift module is used for the transmitting antenna according to time-domain signal data flow correspondence, and described time-domain signal data flow is carried out cyclic shift;
The circulation prefix processing module is used for the data flow after the cyclic shift is added a Cyclic Prefix.
The described combination that is treated to space-time block code or space division multiplexing or space-time block code and space division multiplexing when empty.
It is that open loop is selected at random or closed-loop control is selected that the mode of transmitting antenna group is selected in described data stream separation unit.
When if neighbor cell sends identical information, described data stream separation unit is further used for selecting the transmitting antenna group of described time-domain signal data flow correspondence from the antenna of a plurality of neighbor cells.
In order to realize goal of the invention better, the present invention further provides a kind of wireless communication system, described system comprises at least one multi-antenna transmission system, and a plurality of transmitting antennas corresponding with described multi-antenna transmission system, described multi-antenna transmission system is used for input traffic is sent by described a plurality of transmitting antennas, and described multi-antenna transmission system comprises:
Processing unit when empty is handled when being used for that input traffic carried out sky, exports a plurality of frequency-region signal data flow;
Modulating unit is used for described frequency-region signal data flow is carried out OFDM modulation, the time-domain signal data flow that output is corresponding;
The data stream separation unit is used to select the transmitting antenna group of each time-domain signal data flow correspondence, and with described time-domain signal distribution of flows on the transmitting antenna group of correspondence, the total number of the antenna of described a plurality of transmitting antenna groups equals number of transmit antennas;
The circulation delay sending module is used for that described time-domain signal data flow is carried out circulation delay on all transmitting antennas of the transmitting antenna group of correspondence and sends.
Described circulation delay sending module further comprises:
The data flow replication module is used for time-domain signal data flow replication all transmitting antennas to corresponding transmitting antenna group;
Circular shift module is used for the transmitting antenna according to time-domain signal data flow correspondence, and described time-domain signal data flow is carried out cyclic shift;
The circulation prefix processing module is used for the data flow after the cyclic shift is added a Cyclic Prefix.
The described combination that is treated to space-time block code or space division multiplexing or space-time block code and space division multiplexing when empty.
It is that open loop is selected at random or closed-loop control is selected that the mode of transmitting antenna group is selected in described data stream separation unit.
When if neighbor cell sends identical information, described data stream separation unit is further used for selecting the transmitting antenna group of described time-domain signal data flow correspondence from the antenna of a plurality of neighbor cells.
In order to realize goal of the invention better, the present invention also provides a kind of multi-antenna sending method of wireless signal, and input traffic is sent by a plurality of transmitting antennas, and described method comprises the steps:
Handle when A. input traffic being carried out sky, export a plurality of frequency-region signal data flow;
B. described frequency-region signal data flow is carried out OFDM modulation, the time-domain signal data flow that output is corresponding;
C. select the transmitting antenna group of each time-domain signal data flow correspondence, and with described time-domain signal distribution of flows on the transmitting antenna group of correspondence, the total number of the antenna of described a plurality of transmitting antenna groups equals number of transmit antennas;
D. send carrying out circulation delay on described time-domain signal data flow all transmitting antennas in the transmitting antenna group of correspondence.
Described step D further comprises:
D1. with on time-domain signal data flow replication all transmitting antennas in the corresponding transmitting antenna group;
D2. according to the transmitting antenna of time-domain signal data flow correspondence, described time-domain signal data flow is carried out cyclic shift;
D3. the data flow after the cyclic shift is added a Cyclic Prefix.
The described combination that is treated to space-time block code or space division multiplexing or space-time block code and space division multiplexing when empty.
The mode of described day line options is that open loop is selected at random or closed-loop control is selected.
If when neighbor cell sent identical information, described step C further comprised:
From the antenna of a plurality of neighbor cells, select the transmitting antenna group of described time-domain signal data flow correspondence.
The present invention carries out combination with sky line options and cyclic delay diversity, can obtain space diversity gain by the sky line options on the one hand, utilizes cyclic delay diversity to obtain frequency diversity gain on the other hand.
Description of drawings
Fig. 1 is the structure chart of wireless communication system provided by the invention;
Fig. 2 is the structure chart of circulation delay sending module in the multi-antenna transmission system provided by the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The present invention combines sky line options and cyclic delay diversity technology, the idle antenna of residue after the utilization day line options carries out circulation delay and sends, not only can obtain to select the diversity gain bring, remain circulation delay on the antenna simultaneously and send and also can obtain certain frequency diversity gain by antenna.
Fig. 1 shows the structure of wireless communication system provided by the invention, and is easy in order to describe, and only shows part related to the present invention.In the present invention, wireless communication system comprises at least one multi-antenna transmission system, and each multi-antenna transmission system links to each other with a plurality of transmitting antennas, and input traffic is sent by a plurality of transmitting antennas.Processing unit 101, modulating unit 102, data stream separation unit 103 and a plurality of circulation delay sending module 104 when each antenna transmission system comprises sky.
After input traffic is handled when processing unit 101 carries out sky when sky, export M data flow, so that processed data stream is gone out by a plurality of antenna transmission, wherein M is a natural number, M＞1, the number of the data flow of processing unit 101 outputs is not more than one minimum in number of transmit antennas and the reception antenna number when empty.
Processed data stream is input to modulating unit 102 and carries out the OFDM modulation when empty, and 102 pairs of data streams of modulating unit carry out quick inverse-Fourier transform, and frequency-region signal is converted to time-domain signal.The transmitting antenna group of time-domain signal data flow correspondence is selected to send in data stream separation unit 103, and the data flow after will modulating sends to circulation delay sending module 104 respectively according to the result of sky line options, sends by circulation delay in one group of antenna of its distribution.
It line options can be the selection at random of open loop, also can be that the control of closed loop is selected.The result of it line options is divided into the M group to all transmitting antennas, every group of corresponding data flow of antenna.Antenna number in every group of antenna is indefinite, changes along with the sky line options.
In one embodiment of the invention, 101 pairs of input traffics of processing unit carry out space-time block code when empty, are that example is described as follows with the space-time block code of two antennas:
Suppose X
1, X
2Be two OFDM frequency domain symbols, the frequency-region signal on each subcarrier is X
1(k), X
2(k), k=0 ... N-1, wherein N is the length of OFDM Fourier transform.To X
1, X
2It is as follows to carry out space-time block code:
As can be seen from the above equation when empty processing unit 101 handle each symbol of back constantly the number of output stream be 2, as when first OFDM symbol, two data flow points of output are not X
1, X
2, these two flow points are not input to modulating unit 102 and carry out the OFDM modulation, obtain the time-domain signal of OFDM.
Be input to modulating unit 102 through the data flow of exporting behind the space-time block code, 102 pairs of data streams of modulating unit carry out inverse-Fourier transform, and frequency-region signal is converted to time-domain signal:
The data flow of processing unit 101 outputs when X (k) represents from sky, x
1=(x
1(0), x
1(1) ... x
1(N-1)).
If number of transmit antennas is 5, be divided into two groups after all transmitting antenna process day line options, respectively corresponding data flow, for example the 1st, 3,5 antennas have been given first data flow X through selection
1, the 2nd, 4 antenna assignment given second data flow X
2, then the time-domain signal of two OFDM is sent by circulation delay sending module 104 in transmitting antenna group separately respectively.
In another embodiment of the present invention, 101 pairs of input traffics of processing unit carry out the space division multiplexing processing when empty, and the independent data stream number of supposing space division multiplexing is 3, and the output of processing unit 101 is suc as formula (3) when then empty
In another embodiment of the present invention, processing unit 101 adopts the mode of space-time block code and space division multiplexing combination that data stream is handled when empty, and the data flow number of handling output when supposing sky is 3, and the output of processing unit 101 is as follows when then empty:
First symbol is exported three data flow X constantly as can be seen from following formula
1, X
2, X
3, second symbol exported-X constantly
2 *, X
1 *, X
4The frequency domain symbol of three OFDM that each symbol is exported constantly is input to modulating unit 102 respectively to carry out OFDM modulation and obtains the OFDM time-domain signal, the result of it line options has been divided into three groups to all transmitting antennas after selecting, data stream separation unit 103 is not separated to three data flow points on the corresponding antenna sets, and circulation delay sending module 104 does not send three data flow points after modulating from antenna sets separately by circulation delay.
Fig. 2 shows the structure of circulation delay sending module 104, and the data flow that is used for the circulation delay transmission of 1041 pairs of data stream separation unit of data flow replication module, 103 outputs is duplicated, and the quantity of duplicating is relevant with the antenna amount in each transmitting antenna group.
1042 pairs of OFDM symbols of circular shift module carry out cyclic shift on time domain.Suppose that the number of transmit antennas in the transmitting antenna group of transmitting terminal is M, the figure place of the OFDM symbol cyclic shift on first antenna is 0, and the figure place of other transmitting antenna cocycle displacement is α
M-1, m=2 ... M.
Circulation prefix processing unit 1043 will send from each transmitting antenna after will adding Cyclic Prefix (CP, cyclic prefix) through the data flow after the cyclic shift simultaneously.Data flow added that Cyclic Prefix was used for resisting the influence of multipath before sending, the length of Cyclic Prefix is by the conditional decision of channel.About the relation of circulation figure place and Cyclic Prefix can be with reference to M.Bossert, A.Huebner, F.Schuehlein is at 7th InternationalOFDM-Workshop (InOWo), pp.1-5, Hamburg, Germnay, September 2002. delivers, be entitled as the scientific and technical literature of " On Cyclic Delay Diversity in OFDM Based Transmission Schemes ", the present invention quotes at this, repeats no more.
For example to x
1Two of cyclic shifts, carry out following operation:
x
1(N-2)，x
1(N-1)，x
1(0)，x
1(1)，……，x
1(N-3)
The operation that adds Cyclic Prefix is that data are moved, the data-moving of data flow back is arrived the front of data flow according to the length of Cyclic Prefix, suppose that a data flow is x (0), x (1), x (2), x (N-1), the length of Cyclic Prefix is n, adds Cyclic Prefix and just need carry out following operation:
x(N-n)，x(N-n+1)，…x(N-1)，x(0)，x(1)，…x(N-1)
This shows that the length that data flow adds behind the CP is N+n, is exactly the front that the n of data flow back data are circulated and move data flow in fact.
As an alternative embodiment of the invention, neighbor cell in wireless communication system, be in the edge of sub-district as the user, promptly during the intersection of two sub-districts, two sub-districts can send to the identical information of boundary user simultaneously, just can utilize this moment the present invention that the antenna of two sub-districts is carried out day line options and carry out cyclic shift sending.Supposing has two transmitting antenna Tx1 in the sub-district 1, Tx2 has a transmitting antenna Tx3 in the sub-district 2, supposes to send to two data flow X of certain user
1, X
2Through obtaining the time domain data stream x of OFDM after the space-time block code of two antennas and the modulation
1, x
2, suppose to send data flow x through transmitting antenna Tx1 in the sub-district 1 after day line options and the transmitting antenna Tx3 in the sub-district 2
1, and data flow x
1Need carry out cyclic shift in transmitting antenna Tx3 sends; x
2From transmitting antenna Tx2, send.When other transmitting antenna combination of neighbor cell, also can adopt day line options and circulation delay to send the method for combination.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1, a kind of multi-antenna transmission system of wireless signal, the corresponding a plurality of transmitting antennas of described system are used for input traffic is sent by described a plurality of transmitting antennas, it is characterized in that described system comprises:
Processing unit when empty is handled when being used for that input traffic carried out sky, exports a plurality of frequency-region signal data flow;
Modulating unit is used for described frequency-region signal data flow is carried out OFDM modulation, the time-domain signal data flow that output is corresponding;
The data stream separation unit is used to select the transmitting antenna group of each time-domain signal data flow correspondence, and with described time-domain signal distribution of flows on the transmitting antenna group of correspondence, the total number of the antenna of described a plurality of transmitting antenna groups equals number of transmit antennas;
The circulation delay sending module is used for that described time-domain signal data flow is carried out circulation delay on all transmitting antennas of the transmitting antenna group of correspondence and sends.
2, multi-antenna transmission system as claimed in claim 1 is characterized in that, described circulation delay sending module further comprises:
The data flow replication module is used for time-domain signal data flow replication all transmitting antennas to corresponding transmitting antenna group;
Circular shift module is used for the transmitting antenna according to time-domain signal data flow correspondence, and described time-domain signal data flow is carried out cyclic shift;
The circulation prefix processing module is used for the data flow after the cyclic shift is added a Cyclic Prefix.
3, multi-antenna transmission system as claimed in claim 1 or 2 is characterized in that, the described combination that is treated to space-time block code or space division multiplexing or space-time block code and space division multiplexing when empty.
4, multi-antenna transmission system as claimed in claim 1 or 2 is characterized in that, it is that open loop is selected at random or closed-loop control is selected that the mode of transmitting antenna group is selected in described data stream separation unit.
5, multi-antenna transmission system as claimed in claim 1 or 2, it is characterized in that, when if neighbor cell sends identical information, described data stream separation unit is further used for selecting the transmitting antenna group of described time-domain signal data flow correspondence from the antenna of a plurality of neighbor cells.
6, a kind of wireless communication system, described system comprises at least one multi-antenna transmission system, and a plurality of transmitting antennas corresponding with described multi-antenna transmission system, described multi-antenna transmission system is used for input traffic is sent by described a plurality of transmitting antennas, it is characterized in that described multi-antenna transmission system comprises:
Processing unit when empty is handled when being used for that input traffic carried out sky, exports a plurality of frequency-region signal data flow;
Modulating unit is used for described frequency-region signal data flow is carried out OFDM modulation, the time-domain signal data flow that output is corresponding;
The data stream separation unit is used to select the transmitting antenna group of each time-domain signal data flow correspondence, and with described time-domain signal distribution of flows on the transmitting antenna group of correspondence, the total number of the antenna of described a plurality of transmitting antenna groups equals number of transmit antennas;
The circulation delay sending module is used for that described time-domain signal data flow is carried out circulation delay on all transmitting antennas of the transmitting antenna group of correspondence and sends.
7, wireless communication system as claimed in claim 6 is characterized in that, described circulation delay sending module further comprises:
The data flow replication module is used for time-domain signal data flow replication all transmitting antennas to corresponding transmitting antenna group;
Circular shift module is used for the transmitting antenna according to time-domain signal data flow correspondence, and described time-domain signal data flow is carried out cyclic shift;
The circulation prefix processing module is used for the data flow after the cyclic shift is added a Cyclic Prefix.
8, as claim 6 or 7 described wireless communication systems, it is characterized in that the described combination that is treated to space-time block code or space division multiplexing or space-time block code and space division multiplexing when empty.
As claim 6 or 7 described wireless communication systems, it is characterized in that 9, it is that open loop is selected at random or closed-loop control is selected that the mode of transmitting antenna group is selected in described data stream separation unit.
10, as claim 6 or 7 described wireless communication systems, it is characterized in that, when if neighbor cell sends identical information, described data stream separation unit is further used for selecting the transmitting antenna group of described time-domain signal data flow correspondence from the antenna of a plurality of neighbor cells.
11, a kind of multi-antenna sending method of wireless signal sends input traffic by a plurality of transmitting antennas, it is characterized in that, described method comprises the steps:
Handle when A. input traffic being carried out sky, export a plurality of frequency-region signal data flow;
B. described frequency-region signal data flow is carried out OFDM modulation, the time-domain signal data flow that output is corresponding;
C. select the transmitting antenna group of each time-domain signal data flow correspondence, and with described time-domain signal distribution of flows on the transmitting antenna group of correspondence, the total number of the antenna of described a plurality of transmitting antenna groups equals number of transmit antennas;
D. send carrying out circulation delay on described time-domain signal data flow all transmitting antennas in the transmitting antenna group of correspondence.
12, multi-antenna sending method as claimed in claim 11 is characterized in that, described step D further comprises:
D1. with on time-domain signal data flow replication all transmitting antennas in the corresponding transmitting antenna group;
D2. according to the transmitting antenna of time-domain signal data flow correspondence, described time-domain signal data flow is carried out cyclic shift;
D3. the data flow after the cyclic shift is added a Cyclic Prefix.
13, as claim 11 or 12 described multi-antenna sending methods, it is characterized in that the described combination that is treated to space-time block code or space division multiplexing or space-time block code and space division multiplexing when empty.
As claim 11 or 12 described multi-antenna sending methods, it is characterized in that 14, the mode of described day line options is that open loop is selected at random or closed-loop control is selected.
As claim 11 or 12 described multi-antenna sending methods, it is characterized in that 15, when sending identical information as if neighbor cell, described step C further comprises:
From the antenna of a plurality of neighbor cells, select the transmitting antenna group of described time-domain signal data flow correspondence.
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| WO2009092183A1 (en) * | 2007-12-24 | 2009-07-30 | Lenovo (Beijing) Limited | Signal transmission method and transmitter |
| CN102017444A (en) * | 2008-05-05 | 2011-04-13 | Lg电子株式会社 | Cyclic delay diversity based transmission with delay hopping |
| CN101399637B (en) * | 2007-09-27 | 2012-01-25 | 联想（上海）有限公司 | Method for correcting signal in radio frequency link and pre-corrector |
| CN102342056A (en) * | 2009-03-05 | 2012-02-01 | 三菱电机株式会社 | Wireless communication system, transmitter, and receiver |
| CN101605022B (en) * | 2008-06-12 | 2013-03-20 | 三星电子株式会社 | Coding method for improving transmit diversity in multi-antenna system |
| CN101599813B (en) * | 2008-06-06 | 2013-05-01 | 中兴通讯股份有限公司 | Method and device for switching |
| CN106712848A (en) * | 2016-11-30 | 2017-05-24 | 武汉邮电科学研究院 | Visible light communication method |
| CN106899533A (en) * | 2015-12-18 | 2017-06-27 | 华为技术有限公司 | Multi-antenna diversity transmitting, multi-antenna diversity method of reseptance and device |
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| CN101399637B (en) * | 2007-09-27 | 2012-01-25 | 联想（上海）有限公司 | Method for correcting signal in radio frequency link and pre-corrector |
| WO2009092183A1 (en) * | 2007-12-24 | 2009-07-30 | Lenovo (Beijing) Limited | Signal transmission method and transmitter |
| CN101471755B (en) * | 2007-12-24 | 2011-08-24 | 联想(北京)有限公司 | Transmitter and signal transmission method |
| CN102017444A (en) * | 2008-05-05 | 2011-04-13 | Lg电子株式会社 | Cyclic delay diversity based transmission with delay hopping |
| CN102017444B (en) * | 2008-05-05 | 2015-05-20 | Lg电子株式会社 | Cyclic delay diversity based transmission with delay hopping |
| CN101599813B (en) * | 2008-06-06 | 2013-05-01 | 中兴通讯股份有限公司 | Method and device for switching |
| CN101605022B (en) * | 2008-06-12 | 2013-03-20 | 三星电子株式会社 | Coding method for improving transmit diversity in multi-antenna system |
| CN102342056A (en) * | 2009-03-05 | 2012-02-01 | 三菱电机株式会社 | Wireless communication system, transmitter, and receiver |
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| CN107645329A (en) * | 2012-01-21 | 2018-01-30 | 华为技术有限公司 | The transmission method and device of data |
| CN107733511A (en) * | 2012-01-21 | 2018-02-23 | 华为技术有限公司 | The transmission method and device of data |
| CN107645329B (en) * | 2012-01-21 | 2021-02-26 | 华为技术有限公司 | Data transmission method and device |
| US11038561B2 (en) | 2012-01-21 | 2021-06-15 | Huawei Technologies Co., Ltd. | Method and apparatus for transmitting data |
| CN106899533A (en) * | 2015-12-18 | 2017-06-27 | 华为技术有限公司 | Multi-antenna diversity transmitting, multi-antenna diversity method of reseptance and device |
| CN106712848A (en) * | 2016-11-30 | 2017-05-24 | 武汉邮电科学研究院 | Visible light communication method |
| CN116599561A (en) * | 2023-02-10 | 2023-08-15 | 北京环佳通信技术有限公司 | Wireless ad hoc network multiple-input multiple-output transmission method |
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