MIMO PGRC system and method

1. A method of transmitting a wireless signal from a wireless transmitter, comprising the steps of:

receiving a data stream;

dividing the data stream into a first data stream and a second data stream;

encoding the first data stream in response to a first channel quality indication;

encoding the second data stream separately from the first data stream in response to a second channel quality indication;

converting a first part of the encoded first data stream to a first symbol;

converting a second part of the encoded first data stream to a second symbol;

multiplying the encoded first and second symbols by a linear basis matrix to produce first and second product symbols; and

transmitting the product symbols from at least two transmit antennas of the wireless transmitter.

2. The method of claim 1 , comprising the steps of:

converting a first part of the encoded second data stream to a third symbol;

converting a second part of the encoded second data stream to a fourth symbol;

multiplying the encoded third and fourth are basis matrix to produce third and fourth product symbols; and

transmitting the third and fourth product symbols from the at least two transmit antennas.

3. The method of claim 1 wherein the linear basis matrix is unitary.

4. The method of claim 1 , wherein the linear basis matrix is non-unitary.

5. The method of claim 1 , wherein at least one of the encoded first and second data steams comprise orthogonal frequency division multiplex (OFDM) symbols.

6. The method of claim 1 , wherein the data stream comprises data for at least two different wireless receivers.

7. The method of claim 1 , wherein the data stream comprises data for a single wireless receiver.

8. A wireless transmitter, comprising:

a first serial-to-parallel circuit arranged to convert a data stream into a first data stream and a second data stream;

a first encoder circuit arranged to encode the first data stream at a first data rate;

a second encoder circuit arranged to encode the second data stream at a second data rate greater than the first data rate;

a first symbol mapper arranged to produce a first and a second symbol from the first data stream;

a second symbol mapper arranged to produce a third and a fourth symbol from the second data stream; and

a group circuit arranged to multiply the encoded first, second, third, and fourth symbols by a linear basis matrix to produce a plurality of product symbols.

9. The wireless transmitter of claim 8 , comprising applying the plurality of product symbols to a plurality of transmit antennas.

10. The wireless transmitter of claim 9 , wherein the data stream comprises data for at least two different wireless receivers.

11. The wireless transmitter of claim 9 , comprising more than four transmit antennas.

12. The wireless transmitter of claim 8 , wherein each of the first and second data rates is selected in response to a channel quality indication.

13. The wireless transmitter of claim 8 , comprising:

a first interleaver circuit arranged to interleave the first data stream; and

a second interleaver circuit arranged to interleave the second data stream.

14. The wireless transmitter of claim 8 , wherein the group circuit applies the plurality of product symbols to a plurality of transmit antennas.

15. The wireless transmitter of claim 8 , wherein the linear basis matrix is unitary.

16. The wireless transmitter of claim 8 , wherein the linear basis matrix is non-unitary.

17. The wireless transmitter of claim 8 , wherein the symbols comprise orthogonal frequency division multiplex (OFDM) symbols.

18. The wireless transmitter of claim 8 , wherein the data stream comprises data for a single wireless receiver.

19. A method of receiving a signal at a wireless receiver, comprising the steps of:

receiving at the wireless receiver a plurality of symbols from a plurality of remote transmit antennas;

detecting the plurality of symbols;

receiving a plurality of pilot signals from the remote transmit antennas;

computing an effective channel matrix in response to the received pilot signals;

multiplying the plurality of symbols by the effective channel matrix to produce a plurality of product symbols; and

decoding the plurality of product symbols.

20. The method of claim 19 , wherein the step of receiving a plurality of symbols comprises receiving a plurality of symbols at a plurality of receive antennas.

21. The method of claim 20 , wherein the plurality of receive antennas comprises at least four receive antennas.

22. The method of claim 20 , wherein the plurality of receive antennas comprises more than four receive antennas.

23. The method of claim 19 , wherein the step of detecting comprises Mean Minimum Square Error (MMSE) detection.

24. The method of claim 19 , comprising producing a channel quality indication.

25. The method of claim 19 , comprising the steps of:

producing a channel rotation estimate; and

transmitting the channel quality indication and the channel rotation, estimate to a remote transmitter.

26. The method of claim 19 , wherein the plurality of symbols comprises orthogonal frequency division multiplex (OFDM) symbols.

27. The method of claim 19 , wherein the plurality of symbols comprises data for at least two different users.

28. The method of claim 19 , wherein the plurality of symbols comprises data for a single user.