METHOD AND SYSTEM FOR A MULTIPLE-STREAM SFBC/STBC USING ANGLE FEEDBACK
Aspects of a method and system for a multiple-stream SFBC/STBC using angle feedback are presented. In one aspect of the method and system signals from M distinct spatial streams (N SS =M) are utilized to generate a plurality of 2M distinct transmit chain signals (N TX =2M) that are concurrently transmitted via a plurality of 2M transmitting antennas by a transmitting station. The set of concurrently transmitted transmit chain signals may be received at a receiving station via a plurality of N RX receiving antennas, where N RX ≧M. The receiving station may compute a rotation angle value for each of a plurality of M−1 spatial streams among the plurality of M spatial streams. The receiving station may communicate the computed rotation angle values to the transmitting station. The transmitting station may utilize the received rotation angle values to generate subsequent concurrently transmitted signals.
1 . A method for processing signals, the method comprising:
performing by one or more processors and/or circuits:
generating a plurality of data stream signals based on a concurrently received plurality of signals;
computing a plurality of rotation angle values based on said concurrently received plurality of signals, wherein a number of said plurality of rotation angle values is one less than a number of said plurality of data stream signals; and
transmitting said plurality of rotation angle values.
2 . The method according to claim 1 , comprising generating a channel estimate matrix based on said concurrently received plurality of signals.
3 . The method according to claim 2 , comprising computing a square matrix based on a matrix multiplication of said channel estimate matrix and a Hermitian of said channel estimate matrix.
4 . The method according to claim 3 , comprising determining a plurality of interference values based on off-diagonal elements in said square matrix.
5 . The method according to claim 4 , comprising determining a minimizing condition, wherein said minimizing condition is a function of said plurality of interference values.
6 . The method according to claim 5 , comprising computing said plurality of rotation angle values based on said minimizing condition.
7 . The method according to claim 5 , wherein a function of said plurality of interference values is a function of said plurality of rotation angle values.
8 . The method according to claim 7 , comprising determining a plurality of candidate rotation angle values for said function of said plurality of rotation angle values based on a quantization for said plurality of candidate rotation angle values.
9 . The method according to claim 8 , comprising selecting a portion of said plurality of candidate rotation angle values based on said minimizing condition and said function of said plurality of rotation angle values.
10 . The method according to claim 9 , comprising determining said plurality of rotation angle values based on said selected portion of said plurality of candidate rotation angle values.
11 . A system for processing signals, the system comprising:
one or more circuits the enable generation of a plurality of data stream signals based on a concurrently received plurality of signals;
said one or more circuits enable computation of a plurality of rotation angle values based on said concurrently received plurality of signals, wherein a number of said plurality of rotation angle values is one less than a number of said plurality of data stream signals; and
said one or more circuits enable transmission of said plurality of rotation angle values.
12 . The system according to claim 11 , wherein said one or more circuits enable generation of a channel estimate matrix based on said concurrently received plurality of signals.
13 . The system according to claim 12 , wherein said one or more circuits enable computation of a square matrix based on a matrix multiplication of said channel estimate matrix and a Hermitian of said channel estimate matrix.
14 . The system according to claim 13 , wherein said one or more circuits enable determination of a plurality of interference values based on off-diagonal elements in said square matrix.
15 . The system according to claim 14 , wherein said one or more circuits enable determination of a minimizing condition, wherein said minimizing condition is a function of said plurality of interference values.
16 . The system according to claim 15 , wherein said one or more circuits enable computation of said plurality of rotation angle values based on said minimizing condition.
17 . The system according to claim 15 , wherein a function of said plurality of interference values is a function of said plurality of rotation angle values.
18 . The system according to claim 17 , wherein said one or more circuits enable determination of a plurality of candidate rotation angle values for said function of said plurality of rotation angle values based on a quantization for said plurality of candidate rotation angle values.
19 . The system according to claim 18 , wherein said one or more circuits enable selection of a portion of said plurality of candidate rotation angle values based on said minimizing condition and said function of said plurality of rotation angle values.
20 . The system according to claim 19 , wherein said one or more circuits enable determination of said plurality of rotation angle values based on said selected portion of said plurality of candidate rotation angle values.