Method and apparatus for implementing space time processing

• US 9,991,992 B2
• Filed: 02/16/2017
• Issued: 06/05/2018
• 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 L., Zeira, Eldad M., Voltz, Peter J., Yang, Yongwen E., Dai, Qingyuan, Koo, Chang-Soo, Lu, I-Tai, Tsai, KunJu
• Primary Examiner(s): Musa, Abdelnabi O
• Application Number:
  US15/434,283
• Publication Number:
  US 20170163383A1
• Time in Patent Office: 474 Days
• 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 transmitting multiple data streams in an Institute of Electrical and Electronics Engineers (IEEE) 802.11 device, the method comprising:

generating a first spatial stream and a second spatial stream;

on a condition that the first spatial stream and the second spatial stream belong to a first station (STA);

processing each of the first spatial stream and the second spatial stream to generate two or more space-time streams,

mapping the space-time streams associated with the first STA to a plurality of data streams, and

transmitting the plurality of data streams via a plurality of antennas to the first STA;

on a condition that the first spatial stream belongs to a first STA and the second spatial stream belongs to a second STA;

processing the first spatial stream to generate a first set of two or more space-time streams and the second spatial stream to generate a second set of two or more space-time streams,

mapping the first set of space-time streams and the second set of space-time streams to a plurality of data streams, and

transmitting the data streams via a plurality of antennas to the first STA and the second STA.

2. The method of claim 1, wherein the space-time streams are generated by using one or more of a space time block coding (STBC) processing or a cyclic delay diversity (CDD) processing.

3. The method of claim 1 comprising receiving a V matrix, wherein the processor is configured to receive a V matrix, wherein the V matrix is a unitary matrix derived from singular value decomposition (SVD) of an estimated channel matrix, and wherein the V matrix is associated with a STA and a sub carrier.

4. The method of claim 3, wherein the processing of the spatial streams or the mapping of the space-time streams is performed based on the received V matrix.

5. The method of claim 3 wherein the V matrix is a feedback matrix.

6. The method of claim 4, wherein the feedback matrix is associated with a channel state information (CSI).

7. An Institute of Electrical and Electronics Engineers (IEEE) 802.11 device comprising:

a processor and a memory having stored therein executable instructions for execution by the processor to at least;

generate a first spatial stream and a second spatial stream;

on a condition that the first spatial stream and the second spatial stream belong to a first station (STA);

process each of the first spatial stream and the second spatial stream to generate two or more space-time streams,

map the space-time streams associated with the first STA to a plurality of data streams, and

transmit the plurality of data streams via a plurality of antennas to the first STA;

on a condition that the first spatial stream belongs to a first STA and the second spatial stream belongs to a second STA;

process the first spatial stream to generate a first set of two or more space-time streams and the second spatial stream to generate a second set of two or more space-time streams,

map the first set of space-time streams and the second set of space-time streams to a plurality of data streams, and

transmit the data streams via a plurality of antennas to the first STA and the second STA.

8. The IEEE 802.11 device of claim 7, wherein the space-time streams are generated by using one or more of a space time block coding (STBC) processing or a cyclic delay diversity (CDD) processing.

9. The IEEE 802.11 device of claim 7, wherein the processor is configured to receive a V matrix, wherein the V matrix is a unitary matrix derived from singular value decomposition (SVD) of an estimated channel matrix, and wherein the V matrix is associated with a STA and a sub carrier.

10. The IEEE 802.11 device of claim 9, wherein the processing of the spatial streams or the mapping of the space-time streams is performed based on the received V matrix.

11. The IEEE 802.11 device of claim 9, wherein the V matrix is a feedback matrix.

12. The IEEE 802.11 device of claim 11, wherein the feedback matrix is associated with a channel state information (CSI).