CN101494475B - Power distribution method, transmission and acceptance method and system for multi-input-output system - Google Patents

Power distribution method, transmission and acceptance method and system for multi-input-output system Download PDF

Info

Publication number
CN101494475B
CN101494475B CN200810006038A CN200810006038A CN101494475B CN 101494475 B CN101494475 B CN 101494475B CN 200810006038 A CN200810006038 A CN 200810006038A CN 200810006038 A CN200810006038 A CN 200810006038A CN 101494475 B CN101494475 B CN 101494475B
Authority
CN
China
Prior art keywords
matrix
data
singular value
channel
subchannel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN200810006038A
Other languages
Chinese (zh)
Other versions
CN101494475A (en
Inventor
李少杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZTE Corp
Original Assignee
ZTE Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Priority to CN200810006038A priority Critical patent/CN101494475B/en
Publication of CN101494475A publication Critical patent/CN101494475A/en
Application granted granted Critical
Publication of CN101494475B publication Critical patent/CN101494475B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

The invention provides a power dividing method of a multi-input output system and a receiving and transmitting method and a system which apply the method. The power dividing method comprises the following steps: (a) a transmitter receives a precoding matrix and a singular value matrix feedbacked by a receiver of a prior subframe, wherein, each singular value represents the gain of a subchannel of an independent space; (b) the quality of the transmission performance of each subchannel is judged according to the singular value matrix; and (c) according to the quality of the transmission performance of the subchannel, the non-equal power dividing technology is adopted, and under the premise of guaranteeing the requirements of transmission performance of data stream 1, the surplus power is distributed to data stream 2, thus achieving the requirements of improving the system capacity. The method and the system achieve the requirements of improving the system capacity, do not cause loss of transmission subchannel and improve the data transmission rate.

Description

The power distribution method of multiple input/output system, method for transmitting and receiving and system
Technical field
The present invention relates to wireless communication system, in particular, be a kind of based on the precoding MIMO system power distribution method and use the method for transmitting and receiving and the system of this method.
Background technology
In the wireless communication system; The maximum characteristics of MIMO (multiple-input and multiple-output) are exactly the capacity that has improved system greatly; Can derive based on information theory, if the transmitting power of each transmitting antenna is all identical, the MIMO capability of communication system is with min (M; N) linear growth, wherein M, N are respectively and transmit and receive antenna number.If the receiver of mimo system obtains pre-coding matrix and feeds back to transmitter according to the some or all of channel information of estimating; The pre-coding matrix that transmitter utilization feedback is come carries out precoding to transmitting; Then can further improve power system capacity, increase transmission rate.Though adopt pre-coding scheme can improve the decoding performance of receiver, owing to do not carry out the power adjustment, the capacity of precoding MIMO system does not increase too many.If transmitter further utilizes the channel matrix information that receives to adjust the power of each transmitting antenna of precoding MIMO system, then can further improve the precoding MIMO capability of communication system.
Number of patent application is the one Chinese patent application " launching technique, device and the system that are used for MIMO communication system " of CN200510033643; This patent application receives all or part of channel information of receiver feedback according to transmitter; The signal to noise ratio that wherein comprises each subsignal stream; Obtain pre-coding matrix, and according to the power gain of non-average each subsignal stream of distribution of the signal to noise ratio of each subsignal stream, what it adopted is water-filling; That is: which subchannel signal to noise ratio is high, and the transmitting power of which antenna is just big.Though this mechanism has increased power system capacity, the transmitting power of under the very low situation of some subchannel signal to noise ratios, distributing is very low, is equivalent to lose subchannel, and transmission rate does not increase.
Summary of the invention
The technical problem that the present invention will solve provides a kind of power distributing technique of mimo system, with under the prerequisite of guaranteed performance, has both increased power system capacity, has increased transmission rate again.
For solving the problems of the technologies described above, the invention provides a kind of power distribution method of multiple input/output system, this method may further comprise the steps:
(a) transmitter receives the pre-coding matrix and the singular value matrix of the receiver feedback of a subframe, and what each singular value was wherein represented is the gain of separate space subchannel;
(b) judge the quality of the transmission performance of each subchannel according to singular value matrix;
(c) quality according to the transmission performance of subchannel adopts non-constant power distribution technique, under the prerequisite that the transmission performance that guarantees data flow one requires, unnecessary power division to data flow two, is reached the requirement of raising power system capacity.
Further, the data flow Y1 in the step (c) after the power division, Y2 is respectively Y 1 = λ 1 - Δ λ 1 + λ 2 S 1 , Y 2 = λ 2 + Δ λ 1 + λ 2 S 2 , Wherein S1, S2 are respectively the data flow before distributing, λ 1, λ 2Be respectively the singular value of a subframe, Δ is a variable, decides according to quality of channel.
For solving the problems of the technologies described above, the present invention provides a kind of method for transmitting and receiving of multiple input/output system, and this method may further comprise the steps:
(1) transmitter receives the pre-coding matrix and the singular value matrix of receiver feedback, and what each singular value was wherein represented is the gain of separate space subchannel;
(2) gain of each subchannel of obtaining based on step (1) of emitter; The power gain that non-average each subsignal of distribution flows; Under the prerequisite that the transmission performance that guarantees data flow one requires, unnecessary power division to data flow two, is reached the requirement that improves power system capacity;
(3) transmitter carries out precoding according to the pre-coding matrix that step (1) obtains to each subsignal stream, and the data after the precoding are delivered to transmission antennas transmit;
(4) receiver receives the data of coming through Channel Transmission, training sequence part is carried out channel estimating obtain channel matrix, and data portion is deciphered;
(5) receiver channel matrix that step (4) is obtained carries out singular value decomposition and obtains pre-coding matrix, decoding matrix and singular value matrix, each singular value representative wherein be the gain of separate space subchannel;
(6) receiver channel matrix that step (4) is obtained carries out encoding and decoding and handles, and the decoding data that the channel matrix that obtains after handling and step (4) are obtained carries out input together.
Further, said multiple input/output system is a TDD radio communication system.
Further; In the said step (4); Receiver detects cell system information; Obtain training sequence, spreading code and the scrambling code information of this sub-district simultaneously, the training sequence signal of receiving according to the training sequence information butt joint carries out channel impulse response estimation, obtains pairing channel impulse response and forms channel matrix.
Further, in the said step (4), what receiver received is descending normal speech or data traffic information.
For solving the problems of the technologies described above; The present invention provides a kind of multiple input/output system; This system comprises that data to be sent are handled in earlier stage and power division module, precoding and data transmission module, channel matrix obtains and data decoding module, channel matrix processing module and signal detection module, wherein
Data to be sent are handled in earlier stage and the power division module is used for data to be sent through coding, modulation, spectrum-spreading and scrambling; Power gain based on each subsignal stream of the non-average distribution of the gain of each subchannel; The principle of non-mean allocation is; Under the prerequisite that guarantees data flow one transmission performance, with unnecessary power division to data flow two;
The subsignal flow data of the pre-coding matrix that precoding and data transmission module are used for coming according to receiver feedback after to each modulating-coding carries out precoding;
Channel matrix obtains and the data decoding module is used for carrying out channel impulse response estimation according to the information of sub-district and obtains channel matrix and data are deciphered;
The channel matrix processing module is used for that channel matrix is carried out singular value decomposition and obtains pre-coding matrix and decoding matrix and singular value matrix and according to pre-coding matrix and decoding matrix channel matrix is carried out encoding and decoding and handle;
Signal detection module is used for channel matrix and decoding data after the encoding and decoding processing are carried out input, obtains the expected data of target UE.
Compared to prior art, the present invention is based on the precoding MIMO system, adopt non-constant power distribution technique; Under the certain situation of modulation system; Under the prerequisite that the transmission performance that guarantees data flow one requires, unnecessary power division to data flow two, is reached the requirement that improves power system capacity; And do not lose transmission subchannel, improved message transmission rate.
Description of drawings
Fig. 1 is the flow chart that transmits and receives that the present invention is based on the precoding multiple input/output system.
Fig. 2 is the power division flow chart that the present invention is based on the precoding multiple input/output system.
Fig. 3 is the sketch map that the present invention is based on the precoding multiple input/output system.
Embodiment
The emission reception flow process that the present invention is based on the precoding MIMO system is as shown in Figure 1, and this flow process may further comprise the steps:
Step 101, transmitter receive the pre-coding matrix and the singular value matrix of receiver feedback, and obtain the gain of each subchannel, and each sub-signals stream is carried out code multiplexing, modulation, spectrum-spreading and scrambling;
Step 102; The power gain of non-average each subsignal stream of distribution of the gain of each subchannel that obtains according to step 101; Adopt non-constant power distribution technique, under the certain situation of modulation system, under the prerequisite that the transmission performance that guarantees data flow one requires; Unnecessary power division to data flow two, is reached the requirement that improves power system capacity;
Step 103, the pre-coding matrix that obtains according to step 101 carries out precoding to each subsignal stream, and delivers to transmitting antenna to the data after the precoding, the data flow on each antenna is added midamble form armed base band data;
Step 104; Receiver receives the data of coming through Channel Transmission; Be divided into data division and training sequence part; Receive the training sequence signal according to the training sequence information butt joint and carry out channel impulse response estimation, obtain pairing channel impulse response and form channel matrix, data portion is deciphered;
Step 105, the channel matrix that receiver obtains step 104 are carried out singular value decomposition and are obtained pre-coding matrix, decoding matrix and singular value matrix, and what each singular value was wherein represented is the gain of separate space subchannel;
Step 106, the channel matrix that receiver obtains step 104 are carried out encoding and decoding and are handled, and the decoding data that the matrix after handling and step 104 are obtained carries out input together, obtains the expected data of target UE UE.
Describe below in conjunction with 2 pairs of power distribution methods that the present invention is based on the precoding MIMO system of accompanying drawing, the inventive method may further comprise the steps:
Step 201, transmitter receive the pre-coding matrix and the singular value matrix of the receiver feedback of a subframe, and what each singular value was wherein represented is the gain of separate space subchannel.
For the MIMO antenna system, if the order of channel is M,, can form the subchannel of M quadrature then through pre-coding matrix and reception decoding matrix, can in this M channel, transmit independent data stream respectively.The element of channel response matrix H is made up of the independent Gaussian stochastic variable, as follows:
Figure S2008100060384D00051
The data of x representative antennas emission, the data that on behalf of reception antenna, y receive, so H be illustrated between transmitting antenna and the reception antenna the channel impulse response matrix, such as h 13Represent the channel impulse response between the 3rd transmit antennas and the 1st reception antenna.
y＝Hx+n (2)
Channel matrix H can singular value decomposition be:
H＝D∑P H (3)
Give equality (2) two ends premultiplication matrix D simultaneously H, x being decomposed into x=PS, can obtain so:
r = D H HPS + D H n = ΣS + n ^ - - - ( 4 )
S represents transmitting of spatial sub-channel, and r represents the reception signal of spatial sub-channel, and pairing relation is: x=Ps; R=D HY, wherein P is a pre-coding matrix, decoding matrix is G=D HThe singular value matrix that singular value decomposition obtains Σ = λ 1 λ 2 , Each singular value on the diagonal is represented the gain of this separate space subchannel.
Step 202: the quality of judging the transmission performance of each subchannel according to singular value matrix.
Because singular value matrix is a diagonal matrix; The singular value of each is represented the gain of this separate space subchannel on the diagonal; That is: M singular value being arranged is M with regard to the order that shows channel; Form the subchannel of M quadrature, can in this M channel, transmit independent data stream respectively, what the size of each singular value was represented is exactly the gain of this M orthogonal sub-channels.Because each different data flow is in orthogonal channel, so, be convenient to receiver and detect.The precoding MIMO system carries out precoding to M different data flow after the modulation mapping; Through many antenna emissions; And corresponding at first carry out corresponding decoding processing at receiver and isolate different independent data streams, the information data that is restored of demodulation coding then.
Therefore, singular value is big, representative be that the gain of this subchannel is big, the transmission performance of this subchannel is excellent; Otherwise singular value is little, representative be that the gain of this subchannel is little, this subchannel transmission performance is bad.
Step 203; Quality according to the transmission performance of subchannel adopts non-constant power distribution technique, under the certain situation of modulation system, under the prerequisite that the transmission performance that guarantees data flow one requires; Unnecessary power division to data flow two, is reached the requirement that improves power system capacity.
The singular value matrix that obtains according to singular value decomposition Σ = λ 1 λ 2 , If λ 1, λ 2All non-vanishing, promptly having two singular values to represent the order of channel is 2, forms the subchannel of 2 quadratures, can in these 2 channels, transmit independent data stream respectively.λ 1, λ 2Representative is the gain of subchannel respectively, judges the quality of the transmission performance of channel according to their size, carries out non-constant power and distributes: two data streams of transmitting terminal are S1 through the data flow that code multiplexing, modulation, spectrum-spreading and scrambling obtain, S2, S=[S 1S 2] T, be Y1 through the data flow after the power division, Y2, Y=[Y 1Y 2] TS wherein i, Y iIn i represent precoding input traffic numbering, then
Y 1 = λ 1 - Δ λ 1 + λ 2 S 1 , Y 2 = λ 2 + Δ λ 1 + λ 2 S 2 - - - ( 5 )
Δ here is an indefinite variable, decides according to quality of channel, i.e. the size of order.
If λ 2Very little, show that the gain of second subchannel is very low, it is a little bigger to distribute to this moment this sub-channel power; Guarantee not lose subchannel; Under the prerequisite that guarantees data flow one transmission performance, unnecessary power division to data flow two, is reached the requirement that improves power system capacity and transmission rate.
The present invention also provides a kind of precoding MIMO system; As shown in Figure 3; This system comprises: data to be sent handle in earlier stage and power division module 301, precoding and data transmission module 302, channel matrix obtains and data decoding module 303, channel matrix processing module 304, signal detection module 305, below each module are elaborated.
Data to be sent are handled and power division module 301 in earlier stage; Be used for data to be sent through coding, modulation, spectrum-spreading and scrambling; And based on the power gain of each subsignal stream of the non-average distribution of the gain of each subchannel; The principle of non-mean allocation is: under the prerequisite that guarantees data flow one transmission performance, with unnecessary power division to data flow two;
Precoding and data transmission module 302: the subsignal flow data of the pre-coding matrix that is used for coming according to receiver feedback after to each modulating-coding carries out precoding;
Channel matrix obtains and data decoding module 303: be used for carrying out channel impulse response estimation according to the information of sub-district and obtain channel matrix and data are deciphered;
Channel matrix processing module 304: be used for that channel matrix is carried out singular value decomposition and obtain pre-coding matrix and decoding matrix and singular value matrix and according to pre-coding matrix and decoding matrix channel matrix is carried out encoding and decoding and handle;
Signal detection module 305: be used for channel matrix and decoding data after the encoding and decoding processing are carried out input, obtain the expected data of target UE.
In sum, the present invention is based on the precoding MIMO system, adopt non-constant power distribution technique; Under the certain situation of modulation system, the transmitting power of distributing under the situation very low at some subchannel gains, that environment is very poor is a little bigger, does not lose subchannel; Thereby under the prerequisite that the transmission performance that guarantees data flow one requires, unnecessary power division to data flow two, is reached the requirement that improves power system capacity; And do not lose subchannel, both increased power system capacity, improved message transmission rate again.
Those skilled in the art can also carry out various modifications to above content under the condition that does not break away from the definite the spirit and scope of the present invention of claims.Therefore scope of the present invention is not limited in above explanation, but confirm by the scope of claims.

Claims (7)

1. the power distribution method of a multiple input/output system is characterized in that, this method may further comprise the steps:
(a) transmitter receives the pre-coding matrix and the singular value matrix of the receiver feedback of a subframe, and what each singular value was wherein represented is the gain of separate space subchannel;
(b) judge the quality of the transmission performance of each subchannel according to singular value matrix;
(c) quality according to the transmission performance of subchannel adopts non-constant power distribution technique; Under the certain situation of modulation system; Under the prerequisite that the transmission performance that guarantees data flow one requires, unnecessary power division to data flow two, is reached the requirement that improves power system capacity.
2. the method for claim 1 is characterized in that: the data flow Y1 in the step (c) after the power division, Y2 is respectively Y 1 = λ 1 - Δ λ 1 + λ 2 S 1 , Y 2 = λ 2 + Δ λ 1 + λ 2 S 2 , Wherein S1, S2 are respectively the data flow before the distribution that said data flow one and data flow two obtain through coding, multiplexing, modulation, spread spectrum, scrambling, λ 1, λ 2Be respectively the singular value of a subframe, Δ is a variable, decides according to quality of channel.
3. the method for transmitting and receiving of a multiple input/output system is characterized in that, this method may further comprise the steps:
(1) transmitter receives first pre-coding matrix and first singular value matrix of receiver feedback, and what each singular value was wherein represented is the gain of separate space subchannel;
(2) gain of each subchannel of obtaining based on step (1) of emitter; Non-power gain of distributing each subsignal stream fifty-fifty; Under the prerequisite that the transmission performance that guarantees data flow one requires, unnecessary power division to data flow two, is reached the requirement that improves power system capacity;
(3) transmitter carries out precoding according to first pre-coding matrix that step (1) obtains to each subsignal stream, and the data after the precoding are delivered to transmission antennas transmit;
(4) receiver receives the data of coming through Channel Transmission, training sequence part is carried out channel estimating obtain first channel matrix, and data portion is deciphered;
(5) receiver first channel matrix that step (4) is obtained carries out singular value decomposition and obtains second pre-coding matrix, decoding matrix and second singular value matrix, each singular value representative wherein be the gain of separate space subchannel;
(6) receiver first channel matrix that step (4) is obtained carries out encoding and decoding and handles, and the decoding data that the second channel matrix that obtains after handling and step (4) are obtained carries out input together.
4. method as claimed in claim 3 is characterized in that: said multiple input/output system is a TDD radio communication system.
5. method as claimed in claim 3; It is characterized in that: in the said step (4); Receiver detects cell system information, obtains training sequence, spreading code and the scrambling code information of this sub-district simultaneously, and the training sequence signal of receiving according to the training sequence information butt joint carries out channel impulse response estimation; Obtain pairing channel impulse response, and form first channel matrix.
6. method as claimed in claim 3 is characterized in that: in the said step (4), what receiver received is descending normal speech or data traffic information.
7. multiple input/output system; It is characterized in that; This system comprises that data to be sent are handled in earlier stage and power division module, precoding and data transmission module, channel matrix obtains and data decoding module, channel matrix processing module and signal detection module, wherein
Data to be sent are handled in earlier stage and the power division module be used for to data to be sent encode, modulation, spread spectrum, scrambling; According to the non-power gain of distributing each subsignal stream fifty-fifty of the gain of each subchannel; The principle of non-mean allocation is; Under the prerequisite that guarantees data flow one transmission performance, with unnecessary power division to data flow two;
The subsignal flow data of first pre-coding matrix that precoding and data transmission module are used for coming according to receiver feedback after to each modulating-coding carries out precoding;
Channel matrix obtains and the data decoding module is used for carrying out channel impulse response estimation according to the information of sub-district and obtains first channel matrix and data are deciphered;
The channel matrix processing module is used for that first channel matrix is carried out singular value decomposition and obtains second pre-coding matrix and decoding matrix and first singular value matrix and according to second pre-coding matrix and decoding matrix first channel matrix is carried out encoding and decoding and handle;
Signal detection module is used for second channel matrix and decoding data after the encoding and decoding processing are carried out input, obtains the expected data of target UE.
CN200810006038A 2008-01-25 2008-01-25 Power distribution method, transmission and acceptance method and system for multi-input-output system Active CN101494475B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200810006038A CN101494475B (en) 2008-01-25 2008-01-25 Power distribution method, transmission and acceptance method and system for multi-input-output system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN200810006038A CN101494475B (en) 2008-01-25 2008-01-25 Power distribution method, transmission and acceptance method and system for multi-input-output system

Publications (2)

Publication Number Publication Date
CN101494475A CN101494475A (en) 2009-07-29
CN101494475B true CN101494475B (en) 2012-10-10

Family

ID=40924907

Family Applications (1)

Application Number Title Priority Date Filing Date
CN200810006038A Active CN101494475B (en) 2008-01-25 2008-01-25 Power distribution method, transmission and acceptance method and system for multi-input-output system

Country Status (1)

Country Link
CN (1) CN101494475B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112152685B (en) * 2020-09-28 2022-02-01 展讯通信（上海）有限公司 Site, AP, channel state information feedback, beam forming method and storage medium
CN113300989A (en) * 2021-07-28 2021-08-24 四川创智联恒科技有限公司 Method for rapidly realizing NR-5G physical downlink shared channel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1832369A (en) * 2005-03-12 2006-09-13 中兴通讯股份有限公司 Transmitting method, device and system for multiple input-output comunication system
WO2006098379A1 (en) * 2005-03-16 2006-09-21 Matsushita Electric Industrial Co., Ltd. Adaptive modulation method based on multi-user pre-coding
CN1941660A (en) * 2005-09-30 2007-04-04 松下电器产业株式会社 Multi-user diversity method and system in multi-antenna radio communication system
CN101094022A (en) * 2006-06-19 2007-12-26 联想(北京)有限公司 Transmitter, communication system, and communication method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1832369A (en) * 2005-03-12 2006-09-13 中兴通讯股份有限公司 Transmitting method, device and system for multiple input-output comunication system
WO2006098379A1 (en) * 2005-03-16 2006-09-21 Matsushita Electric Industrial Co., Ltd. Adaptive modulation method based on multi-user pre-coding
CN1941660A (en) * 2005-09-30 2007-04-04 松下电器产业株式会社 Multi-user diversity method and system in multi-antenna radio communication system
CN101094022A (en) * 2006-06-19 2007-12-26 联想(北京)有限公司 Transmitter, communication system, and communication method

Also Published As

Publication number Publication date
CN101494475A (en) 2009-07-29

Similar Documents

Publication Publication Date Title
CN101686110B (en) Multi-input multi-output system, data transmission method and data transmission device thereof
Chung et al. A random beamforming technique in MIMO systems exploiting multiuser diversity
CN102104404B (en) Multi-user MIMO transmission method in wireless communication system, base station and user terminal
CN101682453B (en) CDD precoding for open loop SU MIMO
US8233559B2 (en) Method and apparatus for transmitting a pilot in multi-antenna system
CN102158293B (en) Mimo system with multiple spatial multiplexing modes
CN1890895B (en) Apparatus and method for transmitting data using eigenvector selection in MIMO mobile communication systems
CN100382458C (en) Wireless communication using multi-transmit multi-receive antenna arrays
CN1568586B (en) Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel inversion
CN1717888B (en) MIMO system with multiple spatial multiplexing modes
CN1708933B (en) Closed-loop rate control for a multi-channel communication system
CN100514898C (en) A system and method of dynamically optimizing a transmission mode of wirelessly transmitted information
US9887757B2 (en) Method and apparatus for efficient channel state information dissemination for MU-MIMO transmission schemes based on outdated channel state information
TW200824379A (en) A method of transmitting using phase shift-based precoding and an apparatus for implementing the same in a wireless communication system
KR20070067705A (en) Method and system for link adaptation in an orthogonal frequency division multiplexing (ofdm) wireless communication system
CN101444060A (en) Method of transmitting and receiving data using superpostion modulation in a wireless communication system
EP2731276B1 (en) Multi-antenna signal processing method and device in uplink system
CN102035615A (en) MIMO-based downlink data transmission method, device and system
CN101854186A (en) Pre-coding/pre-decoding method and system used for data transmission
CN102422556A (en) Method for multi-antenna uplink transmission
CN106470064A (en) Send deversity scheme and equipment
EP2134024A2 (en) Control channel transmission method and radio communication apparatus
CN101174924A (en) Method and system for measuring space channel order
CN105515625A (en) Multi-user downlink transmission method based on spatial modulation of receiving end
CN101577968B (en) Method, system and device for obtaining descending channel information

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant