System and method for performing precoding in a wireless communication system
A base station capable of performing precoding in a wireless communication system is provided. The base station includes a plurality of codebooks and a codebook selector. Each codebook comprises a plurality of composite precoding matrices that are generated based on a corresponding diversity precoding matrix. The codebook selector is operable to select one of the codebooks for use in a communication session with a subscriber station.
1. A base station configured to perform precoding in a wireless communication system, the base station comprising:
a codebook selector configured to select one of a plurality of codebooks for use in a communication session with a subscriber station, each codebook comprising a plurality of composite precoding matrices generated based on a corresponding diversity precoding matrix; and
a precoder selector configured to select one of the composite precoding matrices from the selected codebook for use in communicating with the subscriber station.
2. The base station as set forth in claim 1 , wherein the precoder selector is configured to select one of the composite precoding matrices from the selected codebook for use in communicating with the subscriber station for each of one or more transmission time intervals.
3. The base station as set forth in claim 1 , further comprising;
a precoder configured to precode a plurality of data streams based on the selected composite precoding matrix.
4. The base station as set forth in claim 1 , further comprising;
a precoder configured to precode a single data steam based on a transpose of the selected composite precoding matrix.
5. The base station as set forth in claim 1 , wherein the diversity precoding matrix comprises a cyclic delay diversity precoding matrix.
6. The base station as set forth in claim 1 , wherein the composite precoding matrices are further generated based on a power-sharing precoding matrix, the power-sharing precoding matrix comprising a Fourier-based precoding matrix.
7. The base station as set forth in claim 1 , wherein the plurality of codebooks comprise a first codebook and a second codebook, the diversity precoding matrix corresponding to the first codebook is configured to provide no phase shift, and the diversity precoding matrix corresponding to the second codebook is configured to provide a phase shift.
8. The base station as set forth in claim 1 , wherein the selected composite precoding matrix comprises a matrix having a number of entries based on a number of antennas used to communicate with the subscriber station.
9. The base station as set forth in claim 1 , wherein the codebook selector is configured to select one of the codebooks based on a mobility of the subscriber station.
10. A channel controller configured to perform precoding in a wireless communication system, the channel controller comprising:
a precoder configured to perform precoding on a plurality of data streams using a plurality of composite precoding matrices, each of the composite precoding matrices associated with a power-sharing precoding matrix and a diversity precoding matrix; and
a precoder selector configured to select one of the composite precoding matrices for use in communicating with a subscriber station.
11. The channel controller as set forth in claim 9 , wherein the precoder is further configured to precode a single data stream using a transpose of the selected composite precoding matrix.
12. The channel controller as set forth in claim 9 , wherein the diversity precoding matrix comprises a cyclic delay diversity precoding matrix.
13. The channel controller as set forth in claim 9 , wherein the power-sharing precoding matrix comprises a Fourier-based precoding matrix.
14. A method for performing precoding in a wireless communication system, the method comprising:
storing a plurality of codebooks, each codebook comprising a plurality of composite precoding matrices that are generated based on a corresponding diversity precoding matrix;
selecting one of the codebooks for use in a communication session with a subscriber station; and
selecting one of the composite precoding matrices from the selected codebook for use in communicating with the subscriber station.
15. The method as set forth in claim 14 , wherein selecting one of the composite precoding matrices from the selected codebook comprises selecting one of the composite precoding matrices from the selected codebook for use in communicating with the subscriber station for each of one or more transmission time intervals.
16. The method as set forth in claim 14 , further comprising precoding a plurality of data streams based on the selected composite precoding matrix.
17. The method as set forth in claim 14 , further comprising precoding a single data stream based on a transpose of the selected composite precoding matrix.
18. The method as set forth in claim 14 , wherein the diversity precoding matrix comprises a cyclic delay diversity precoding matrix.
19. The method as set forth in claim 14 , wherein the composite precoding matrices are further generated based on a power-sharing precoding matrix, the power-sharing precoding matrix comprising a Fourier-based precoding matrix.
20. The method as set forth in claim 14 , wherein the plurality of codebooks comprise a first codebook and a second codebook, the diversity precoding matrix corresponding to the first codebook provides no phase shift, and the diversity precoding matrix corresponding to the second codebook provides a phase shift.