High data rate closed loop MIMO scheme combining transmit diversity and data multiplexing

• US 7,181,167 B2
• Filed: 11/21/2002
• Issued: 02/20/2007
• Est. Priority Date: 11/21/2001
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Texas Instruments, Inc.
• Inventors: Onggosanusi, Eko N., Dabak, Anand G., Schmidl, Timothy M.
• Primary Examiner(s): Nguyen; Duc
• Assistant Examiner(s): Phuong; Dai
• Application Number:
  US10/301,392
• Publication Number:
  US 20030139139A1
• Time in Patent Office: 1,552 Days
• Field of Search: 455/456.5, 455/575.7, 455/575.5, 455/561, 455/562.1, 455/560, 455/13.3, 455/500, 455/506, 455/515, 455/63.1, 455/63.4, 455/101, 375/267
• US Class Current: 455/63.1
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0854 using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
• CPC Class Codes: H04B 7/0857 using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]

Abstract

Closed loop multiple-antenna wireless communications system with antenna weights determined by maximizing a composite channel signal-to-interference-plus-noise ratio minimum. Multiplexed symbol streams over subsets of antennas enhance throughput.

Claims

1. A method of transmission of a symbol stream, comprising:

(a) providing P transmit antennas where P is an integer greater than or equal to 3;

(b) providing estimates for communication channels from said P antennas to Q receive antenna(s) where Q is a positive integer;

(c) providing M symbol streams to transmit from said P antennas through said communication channels where M is an integer greater than or equal to 2, and said M symbol streams derive from a single input symbol stream;

(d) providing weights for said P antennas, said weights multiplying said symbols.

2. The method of claim 1, wherein:

(a) said providing weights of step (d) of claim 1 includes maximizing a minimum signal-to-interference-plus-noise ratio of said M symbol streams after detection.

3. The method of claim 2, wherein:

(a) said detection of claim 2 is selected from the group consisting of linear zero-forcing, linear minimum mean square error, iterative zero-forcing, and iterative minimum mean square error.

4. The method of claim 2, wherein:

(a) said detection of claim 2 is maximum likelihood detector with SER selection criterion.

5. The method of claim 1, wherein:

(a) said weights of step (d) of claim 1 correspond to a diagonal M×

M block matrix of (P/M)×

1 blocks where each (P/M)×

1 block corresponds to weights for a symbol stream of said M symbol streams.

6. The method of claim 1, wherein:

(a) said weights of step (d) of claim 1 correspond to a (P/M)×

1 block matrix of M×

M blocks where each M×

M block is an M×

M unitary matrix.

7. The method of claim 1, wherein:

(a) said providing channel estimates of step (b) of claim 1 is by reception from said receiver in said channel.

8. The method of claim 1, wherein:

(a) said providing channel estimates of step (b) of claim 1 is by reception of channel information from said receiver.

9. The method of claim 1, wherein:

(a) said channel estimates of step (b) of claim 1 are updated; and

(b) said weights of step (d) of claim 1 are updated in response to said channel estimates update.

10. The method of claim 1, wherein:

(a) said integer Q is greater than or equal to said integer P.

11. The method of claim 1, wherein:

(a) said communication channels include multipath interference; and

(b) said detection accounts for said multipath interference;

Maximum likelihood +SER selection criterion.

12. The method of claim 11, wherein:

(a) said detection of step (d) of claim 1 is selected from the group consisting of linear zero-forcing, linear minimum mean square error, iterative zero-forcing, and iterative minimum mean square error.

13. The method of claim 1, wherein:

(a) said communication channel is a wideband or CDMA channel with multiple users.

14. The method of claim 1, wherein:

(a) said communication channel is a wideband or CDMA channel with a single user with multiple codes.

15. The method of claim 1, wherein:

(a) said communication channel is a narrowband or TDMA channel.

16. The method of claim 1, wherein:

(a) said communication channel is an OFDM channel.

17. a transmitter, comprising:

(a) P transmitt antennas where P is an interger which is a multiple of an integer M where M is greater than 1;

(b) M data stream inputs coupled to said P antennas by P multiply M weights;

said weights determined from both (i) information of communication channels from said P antennas to Q receive antenna(s) where Q is a positive integer, and (ii) a detection method for said M data streams inputs at said Q antenna(s), said M data stream inputs couple to a primary data stream input.

18. The transmitter of claim 17, wherein:

(a) said weights are all 0 except for M sets, each set of size K wherein P=M multiply by K, and each of said M sets couples one of said data streams to a set of K antennas.

19. The transmitter of claim 17 the transmitter wherein:

(a) said weights are partitioned into K wherein P=M multiply by K sets, each set forming an M.times.M unitary transformation of symbols at said M data stream inputs, and each of said K sets couples said M data streams inputs to a corresponding set of M antennas.

20. The transmitter of claim 17, wherein:

(a) said weights are determined outside of said transmitter and received by said transmitter from said signals from said Q antenna(s).