Unitary precoding based on randomized FFT matrices
Unitary precoding based on randomized FFT matrices
 CN 101,529,736 A
 Filed: 10/30/2006
 Published: 09/09/2009
 Est. Priority Date: 10/28/2005
 Status: Active Application
First Claim
Patent Images
1. method that helps to be provided for the channel related feedback of precoding in the wireless communication system, it comprises:
 One group of unitary matrix of construction, each in the described unitary matrix are based on diagonal matrix and discrete Fourier transform (DFT) (DFT) matrix and produce;
Estimation based on forward link channel is selected particular unitary matrix from described group of unitary matrix;
AndTransmit the index that is associated with described particular unitary matrix via reverse chain channel.
Chinese PRB Reexamination
Abstract
The present invention discloses systems and methodologies that facilitate constructing unitary matrices that may be utilized in linear precoding for multipleinput multipleoutput (MIMO) wireless communication systems. Each unitary matrix may be generated by combining (e.g., multiplying) a diagonal matrix with a Discrete Fourier Transform (DFT) matrix. The unitary matrices may be utilized to provide feedback related to a channel and/or control transmission over a channel based upon obtained feedback.

8 Citations
Transmission terminal and method of selecting transmission antenna  
Patent #
CN 102,487,290 A
Filed 05/24/2011

Current Assignee

Feedback for supporting SUMIMO and MUMIMO operation in wireless communication  
Patent #
CN 102,714,530 A
Filed 01/25/2011

Current Assignee

Precoder structure for MIMO precoding  
Patent #
US 9,831,930 B2
Filed 04/26/2016

Current Assignee
N/A

Parameterized codebook with subset restrictions for use with precoding MIMO transmissions  
Patent #
US RE47,074 E1
Filed 02/16/2016

Current Assignee
N/A

Information transmitting method and equipment for multiaerial system  
Patent #
CN 102,122,980 A
Filed 01/08/2010

Current Assignee

Precoder structure for MIMO precoding  
Patent #
US 10,250,308 B2
Filed 11/27/2017

Current Assignee
N/A

Precoder structure for MIMO precoding  
Patent #
US 10,250,308 B2
Filed 11/27/2017

Current Assignee
N/A

Parameterized codebook subsets for use with precoding MIMO transmissions  
Patent #
US 10,291,302 B2
Filed 05/28/2014

Current Assignee
N/A

No References
43 Claims

1. method that helps to be provided for the channel related feedback of precoding in the wireless communication system, it comprises:

One group of unitary matrix of construction, each in the described unitary matrix are based on diagonal matrix and discrete Fourier transform (DFT) (DFT) matrix and produce; Estimation based on forward link channel is selected particular unitary matrix from described group of unitary matrix;
AndTransmit the index that is associated with described particular unitary matrix via reverse chain channel.


2. method according to claim 1, it further comprises by making described diagonal matrix multiply by described DFT matrix and produces in the described unitary matrix each.

3. method according to claim 1, wherein said diagonal matrix is associated with random phase.

4. method according to claim 1, wherein said DFT matrix is M _{T}* L matrix, M _{T}The order of idle bit when being for the number of transmit antenna and L.

5. method according to claim 1, it further comprises assessment
${F}_{{M}_{T}\&}$  times;
L = 1 M T [ e  j 2 &
pi;
nlM T ] To obtain described DFT matrix, wherein n from 0 to M _{T}1, l is from 0 to L1, M _{T}The order of idle bit when being for the number of transmit antenna and L.
 times;

6. method according to claim 1, wherein said DFT matrix column is orthonormal.

7. method according to claim 1, it further comprises described group of unitary matrix is transferred to different communication equipment.

8. method according to claim 1, it further comprises estimates that described forward link channel is to generate channel matrix.

9. method according to claim 8, it comprises that further the feature decomposition that realizes described channel matrix is to produce channel unitary matrix.

10. method according to claim 9 is selected described particular unitary matrix further to comprise described channel unitary matrix and described group of unitary matrix is compared to discern described particular unitary matrix.

11. method according to claim 1, wherein said group of unitary matrix are similar to one group of unitary matrix that adopt base station that described index is transferred to substantially.

12. method according to claim 1, wherein said wireless communication system are multipleinput and multipleoutput (MIMO) system.

13. method according to claim 1, wherein said wireless communication system are time division duplex (TDD) system.

14. method according to claim 1, wherein said wireless communication system are Frequency Division Duplexing (FDD) (FDD) system.

15. a Wireless Telecom Equipment, it comprises:

Memory, it is kept for producing the instruction of channel related feedback that one group of unitary matrix and generation are used to be selected from the precoding of described group of unitary matrix based on diagonal matrix and discrete Fourier transform (DFT) (DFT) combinations of matrices;
AndProcessor, it is coupled to described memory, is configured to carry out the described instruction that remains in the memory.


16. Wireless Telecom Equipment according to claim 15, wherein said memory further are kept for by making described diagonal matrix multiply by the instruction that described DFT matrix produces described group of unitary matrix.

17. Wireless Telecom Equipment according to claim 15, wherein said diagonal matrix each be associated with a random phase and described DFT matrix each be a M _{T}* L matrix, M _{T}The order of idle bit when being for the number of transmit antenna and L.

18. Wireless Telecom Equipment according to claim 15, wherein said memory further is kept for following instruction:
 estimate that forward link channel is to generate channel estimating;
From described group of unitary matrix, select particular unitary matrix based on described channel estimating;
And the index that transmission is associated with described particular unitary matrix on reverse chain channel.
 estimate that forward link channel is to generate channel estimating;

19. a Wireless Telecom Equipment that produces unitary matrix and be provided for the channel related feedback of precoding, it comprises:

Be used for device based on diagonal matrix and one group of unitary matrix of discrete Fourier transform (DFT) (DFT) matrix construction; Be used for selecting from described group of unitary matrix the device of particular unitary matrix based on channel estimating;
AndBe used for transmitting the device of the index that is associated with described particular unitary matrix via reverse chain channel.


20. Wireless Telecom Equipment according to claim 19, it further comprises each the device that is used for by making specific diagonal matrix the multiply by corresponding DFT matrix described unitary matrix of construction.

21. Wireless Telecom Equipment according to claim 19, it further comprises:

Be used to produce the device of described diagonal matrix;
AndThe device that is used for the described DFT matrix of construction.


22. a machinereadable medium stores machineexecutable instruction on it, described machineexecutable instruction is used for:

Produce one group of unitary matrix, each in the described unitary matrix is configured as the function of diagonal matrix and discrete Fourier transform (DFT) (DFT) matrix; Estimate that forward link channel is to generate channel estimating; From described group of unitary matrix, discern particular unitary matrix based on described channel estimating; Determine to be selected from the index of the described particular unitary matrix of described group of unitary matrix;
AndTransmit described index via reverse chain channel.


23. further comprising, machinereadable medium according to claim 22, described machineexecutable instruction make described diagonal matrix multiply by described DFT matrix to generate each in the described unitary matrix.

24. the equipment in wireless communication system, it comprises:

Processor, it is configured to; Code book based on diagonal matrix and discrete Fourier transform (DFT) (DFT) matrix generation unitary matrix; Based on the definite particular unitary matrix of the assessment of forward link channel for the feedback of in precoding, using;
AndTo send to the base station with the index that described particular unitary matrix is associated via reverse chain channel.


25. one kind helps the method for control transmission in response to the feedback in the wireless communication system, it comprises:

One group of unitary matrix of construction, each in the described unitary matrix are based on diagonal matrix and discrete Fourier transform (DFT) (DFT) matrix and produce; From described group of unitary matrix, discern selected unitary matrix based on the reception index;
AndBased on the transmission on the described selected unitary matrix modification forward link channel.


26. method according to claim 25 is revised transmission on the described forward link channel and is comprised that further making described selected unitary matrix multiply by transmission vector treats signal via described forward link channel transmission with generation.

27. method according to claim 25, the transmission of revising on the described forward link channel comprises that further inciting somebody to action similar substantially throughput power based on described selected unitary matrix is used for each transmit antenna.

28. method according to claim 25, it further comprises each in the described unitary matrix of construction by making described diagonal matrix multiply by described DFT matrix.

29. method according to claim 25, wherein said diagonal matrix is associated with random phase.

30. method according to claim 25, wherein said DFT matrix is M _{T}* L matrix, M _{T}The order of idle bit when being for the number of transmit antenna and L.

31. method according to claim 25, wherein said group of unitary matrix is similar to the one group of unitary matrix that mobile device adopted that receives described index from it substantially.

32. method according to claim 25, wherein said wireless communication system are multipleinput and multipleoutput (MIMO) system.

33. method according to claim 25, wherein said wireless communication system are in time division duplex (TDD) system and Frequency Division Duplexing (FDD) (FDD) system at least one.

34. method according to claim 25, it further comprises based on described selected unitary matrix realizes beam shaping.

35. a Wireless Telecom Equipment, it comprises:

Memory, it is kept for following instruction;
based on diagonal matrix and one group of unitary matrix of discrete Fourier transform (DFT) (DFT) combinations of matrices construction, from described group of unitary matrix, discern particular unitary matrix based on the index that is obtained, and based on the transmission on the described particular unitary matrix control forward link channel;
AndProcessor, it is coupled to described memory, is configured to carry out the described instruction that remains in the memory.


36. further comprising, Wireless Telecom Equipment according to claim 35, wherein said memory be used to make described diagonal matrix to multiply by described DFT matrix to generate the instruction of described unitary matrix.

37. Wireless Telecom Equipment according to claim 35, wherein said memory further comprise be used to make described particular unitary matrix and transmission vector combined with can with substantially similarly throughput power be used for the instruction of each transmit antenna.

38. the transmission wireless communication equipment on construction unitary matrix and the control channel, it comprises:

Be used for producing the device of one group of unitary matrix based on diagonal matrix and discrete Fourier transform (DFT) (DFT) matrix; Be used for based on the device of reception index from the described group of selected unitary matrix of unitary matrix identification;
AndBe used for device based on the transmission on the described selected unitary matrix control forward link channel.


39. according to the described Wireless Telecom Equipment of claim 38, it further comprises and being used for described selected unitary matrix and the combined device of transmission vector that supplies in described forward link channel transmission.

40. a machinereadable medium stores machineexecutable instruction on it, described machineexecutable instruction is used for:

Obtain diagonal matrix; Obtain discrete Fourier transform (DFT) (DFT) matrix;
AndDescribed diagonal matrix and described DFT matrix is combined to generate the unitary matrix that combines utilization with linear predictive coding.


41. according to the described machinereadable medium of claim 40, described machineexecutable instruction comprises that further generation comprises the code book of N unitary matrix, wherein N is an integer.

42. according to the described machinereadable medium of claim 41, described machineexecutable instruction further comprises based on the index that is obtained determines that from described code book selected unitary matrix reaches based on the transmission on the described selected unitary matrix control forward link channel.

43. the equipment in wireless communication system, it comprises:

Processor, it is configured to; Build based on diagonal matrix and discrete Fourier transform (DFT) (DFT) matrix and to put the code book that comprises one group of unitary matrix; From described group of unitary matrix, determine selected unitary matrix based on the reception index;
AndAdjust transmission on the forward link channel based on described selected unitary matrix.

Specification(s)