MIMO PGRC system and method

Patent metadata

Field	Value
Publication number	US-9270410-B2
Application number	US-41866106-A
Country	US
Kind code	B2
Filing date	May 5, 2006
Priority date	Apr 22, 2002
Publication date	Feb 23, 2016
Grant date	Feb 23, 2016

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 ).

First claim

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.

Assignees

• Onggosanusi Eko N
• Dabak Anand G
• Schmidt Timothy M
• Varadarajan Badri N
• Texas Instruments Inc

Inventors

• Onggosanusi Eko N
• Dabak Anand G
• Schmidt Timothy M
• Varadarajan Badri N

Classifications

• H04B7/0691 Primary

  using subgroups of transmit antennas · CPC title

• H04L27/2601

  Multicarrier modulation systems · CPC title

• H04B7/0854

  using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion · CPC title

• H04B17/336

  Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] · CPC title

• H04L1/0009 Primary

  by adapting the channel coding (H04L1/1812 takes precedence) · CPC title