MIMO PGRC system and method

Abstract

A method of transmitting a wireless signal (FIGS. 3 A- 3 C) is disclosed. A data stream is divided ( 306 ) into a first data stream and a second data stream. The first data stream is encoded ( 300 ) at a first data rate. The second data stream is encoded ( 320 ) at a second data rate different from the first data rate. A first part of the encoded first data stream is transmitted from a first transmit antenna ( 308 ). A second part of the encoded first data stream is transmitted from a second transmit antenna ( 312 ).

What is claimed is:  
     
       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.