Method and apparatus for implementing space time processing with unequal modulation and coding schemes

• US 8,295,401 B2
• Filed: 01/10/2007
• Issued: 10/23/2012
• Est. Priority Date: 01/11/2006
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Olesen, Robert Lind, Zeira, Eldad M., Voltz, Peter J., Yang, Yongwen E., Dai, Qingyuan, Koo, Chang-Soo, Lu, I-Tai, Tsai, KunJu
• Primary Examiner(s): Payne, David C.
• Assistant Examiner(s): Stevens, Brian J
• Application Number:
  US11/621,755
• Publication Number:
  US 20070211822A1
• Time in Patent Office: 2,113 Days
• Field of Search: 375/299, 375/347, 375/295, 375/346, 375/316
• US Class Current: 375/299
• CPC Class Codes: H04B 17/336 Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0619 using feedback from receiving side feedback signaling for adaptive modulation/coding H04L1/0001
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04B 7/0837 using pre-detection combining H04B7/0868 takes precedence
• CPC Class Codes: H04B 7/0891 Space-time diversity rake receivers H04B1/7115; space-time decoding H04L1/0631
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0606 Space-frequency coding
• CPC Class Codes: H04L 1/0625 Transmitter arrangements
• CPC Class Codes: H04L 1/0631 Receiver arrangements
• CPC Class Codes: H04L 1/0643 block codes
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A method and apparatus for implementing spatial processing with unequal modulation and coding schemes (MCSs) or stream-dependent MCSs are disclosed. Input data may be parsed into a plurality of data streams, and spatial processing is performed on the data streams to generate a plurality of spatial streams. An MCS for each data stream is selected independently. The spatial streams are transmitted via multiple transmit antennas. At least one of the techniques of space time block coding (STBC), space frequency block coding (SFBC), quasi-orthogonal Alamouti coding, time reversed space time block coding, linear spatial processing and cyclic delay diversity (CDD) may be performed on the data/spatial streams. An antennal mapping matrix may then be applied to the spatial streams. The spatial streams are transmitted via multiple transmit antennas. The MCS for each data stream may be determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.

Claims

1. A method for implementing spatial data processing with unequal modulation and coding schemes (MCSs), the method comprising:

generating a first spatial stream and a second spatial stream;

performing a space time block coding (STBC) processing on the first spatial stream to generate two STBC-processed data streams;

performing a cyclic delay diversity (CDD) processing on the second spatial stream; and

transmitting simultaneously the STBC-processed data streams and the CDD-processed second spatial stream in parallel with at least three antennas, the STBC-processed data streams being transmitted via at least two antennas, respectively, and the CDD-processed second spatial stream being transmitted via at least one additional antenna, wherein an MCS is selected for each spatial stream independently of the other spatial stream and each of the spatial streams is modulated with the selected MCS for each spatial stream.

2. The method of claim 1 wherein an antenna mapping matrix is multiplied to the spatial streams.

3. The method of claim 2 wherein the antenna mapping matrix is an identity matrix.

4. The method of claim 2 wherein the antenna mapping matrix is for spatial spreading.

5. The method of claim 2 wherein the antenna mapping matrix is a channel-specific steering matrix.

6. The method of claim 5 wherein the antenna mapping matrix includes a set of channel eigenvectors.

7. The method of claim 1 wherein the MCS for each data stream is determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.

8. A method for implementing spatial data processing with unequal modulation and coding schemes (MCSs), the method comprising:

receiving data streams with at least two receive antennas; and

performing a spatial decoding on the data streams to recover a plurality of spatial streams that are transmitted simultaneously via at least three antennas including a first spatial stream transmitted using space time block coding (STBC) via at least one pair of antennas and a second spatial stream transmitted using cyclic delay diversity (CDD) via another antenna, an MCS being used for each spatial stream independently of an MCS for the other spatial stream.

9. A transmitter for implementing spatial data processing with unequal modulation and coding schemes (MCSs), the transmitter comprising:

a spatial processor for performing space time block coding (STBC) on a first spatial stream among a plurality of spatial streams to generate two STBC-processed data streams, and performing a cyclic delay diversity (CDD) processing on a second spatial stream, an MCS being selected for each spatial stream independently of an MCS for the other spatial stream and each of the spatial streams being modulated with a selected MCS for each spatial stream; and

at least three transmit antennas for simultaneously transmitting the two STBC-processed data streams and the CDD-processed second spatial stream in parallel, the STBC-processed data streams being transmitted via at least two antennas, respectively, and the CDD-processed second spatial stream being transmitted via at least one additional antenna.

10. The transmitter of claim 9 wherein the spatial processor is configured to apply an antenna mapping matrix to the spatial streams.

11. The transmitter of claim 10 wherein the antenna mapping matrix is an identity matrix.

12. The transmitter of claim 10 wherein the antenna mapping matrix is for spatial spreading.

13. The transmitter of claim 10 wherein the antenna mapping matrix is a channel-specific steering matrix.

14. The transmitter of claim 13 wherein the antenna mapping matrix includes a set of channel eigenvectors.

15. The transmitter of claim 9 wherein the MCS for each data stream is determined based on a signal-to-noise ratio of each spatial stream associated with the data stream.

16. A receiver for implementing spatial data processing with unequal modulation and coding schemes (MCSs), the receiver comprising:

at least two receive antennas for receiving a plurality of data streams; and

a spatial decoder for performing a spatial decoding on the data streams to recover a plurality of spatial streams that are simultaneously transmitted via at least three antennas including a first spatial stream transmitted using space time block coding (STBC) via at least one pair of antennas and a second spatial stream transmitted via at least one another antenna, the second spatial stream being processed by a cyclic delay diversity (CDD) processing, an MCS being used for each spatial stream independently of an MCS for the other spatial stream.