Method and apparatus for implementing space time processing with unequal modulation and coding schemes
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.
1. A method for implementing spatial data processing, the method comprising:
selecting a first modulation and coding scheme, MCS, and a second MCS, wherein the selected first MCS comprises a first modulation scheme, and the selected second MCS comprises a second modulation scheme, and wherein the selected second modulation scheme is of higher order than the selected first modulation scheme;
parsing encoded input data to generate a first spatial stream and a second spatial stream;
mapping the encoded first spatial stream using the selected first modulation scheme associated with the selected first MCS;
mapping the encoded second spatial stream using the selected second modulation scheme associated with the selected second MCS;
performing space time block coding, STBC, on the mapped first spatial stream to generate a first space-time stream, a second space-time stream; and
performing STBC on the mapped second spatial stream to generate a third space-time stream and a fourth space-time stream, mapping the first space-time stream, the second space-time stream, the third space-time stream, and the fourth space-time stream to a plurality of antennas for transmission.
2. The method of claim 1 , further comprising multiplying an antenna mapping matrix to the first space-time stream, the second space-time stream, the third space-time stream, and the fourth space-time stream.
3. The method of claim 2 , wherein the antenna mapping matrix is a channel-specific steering matrix.
4. The method of claim 2 , wherein the antenna mapping matrix includes a set of channel eigenvectors.
5. The method of claim 1 , further comprising encoding input data based on a coding rate associated with the selected first MCS or the selected second MCS.
6. A transmitter device for implementing spatial data processing, the transmitter device comprising:
a processor configured at least to:
select a first modulation and coding scheme, MCS, and a second MCS wherein the selected first MCS comprises a first modulation scheme, and the selected second MCS comprises a second modulation scheme, wherein the selected second modulation scheme is of higher order than the selected first modulation scheme;
parse encoded input data to generate a first spatial stream and a second spatial stream;
map the encoded first spatial stream using the selected first modulation scheme associated with the selected first MCS;
map the encoded second spatial stream using the selected second modulation scheme associated with the selected second MCS;
perform space time block coding, STBC, on the mapped first spatial stream to generate a first space-time stream, a second space-time stream;
perform STBC on the mapped second spatial stream to generate a third space-time stream and a fourth space-time stream;
map the first space-time stream, the second space-time stream, the third space-time stream, and the fourth space-time stream to a plurality of antennas for transmission.
7. The transmitter device of claim 6 , wherein the processor is configured to multiply an antenna mapping matrix to the first space-time stream, the second space-time stream, the third space-time stream, and the fourth space-time stream.
8. The transmitter device of claim 7 , wherein the antenna mapping matrix is a channel-specific steering matrix.
9. The transmitter device of claim 7 , wherein the antenna mapping matrix includes a set of channel eigenvectors.
10. The transmitter device of claim 6 , wherein the processor is configured to encode input data based on a coding rate associated with the selected first MCS or the selected second MCS.