MIMO systems with rate feedback and space time transmit diversity

• US 7,092,737 B2
• Filed: 07/31/2002
• Issued: 08/15/2006
• Est. Priority Date: 07/31/2002
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Electric Research Laboratories, Inc. (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Electric Research Laboratories, Inc. (Mitsubishi Electric Corporation)
• Inventors: Zhang, Jinyun, Horng, Jyhchau
• Primary Examiner(s): Anderson, Matthew D.
• Assistant Examiner(s): TRINH, TAN H
• Application Number:
  US10/209,306
• Publication Number:
  US 20040204104A1
• Time in Patent Office: 1,476 Days
• Field of Search: 455/562.1, 455/561, 455/454, 455/450, 455/452.1, 455/456.5, 375/267, 375/295, 375/130, 375/335, 370/320, 370/349
• US Class Current: 455/562.1
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0673 using feedback from receiving side
• CPC Class Codes: H04B 7/0691 using subgroups of transmit antennas
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/0618 Space-time coding

Abstract

A method and system transmits a stream of data symbols in a multiple-input/multiple-output wireless communications system that includes M pairs of transmitting antennas. The stream of data symbols are demultiplexed into M sub-streams and adaptively modulated and coded to a maximum data rate while achieving a predetermine performance on an associated channel used to transmit the sub-stream. Space-time transmit diversity encoding is applied to each coded sub-stream to generate two output streams, one output stream for each antenna.

Claims

1. A method for transmitting a stream of data symbols in a multiple-input/multiple-output wireless communications system including M pairs of transmitting antennas, comprising:

demultiplexing the stream of data symbols into M sub-streams;

adaptively modulating and coding each sub-stream to a maximum data rate while achieving a predetermine performance on an associated channel used to transmit the sub-stream; and

space-time transmit diversity encoding each coded sub-stream into two output streams, one output stream for each of a pair of antennas.

2. The method of claim 1 further comprising:

feeding back, from a receiver, channel conditions of the associated channel; and

selecting the maximum data rate based on the channel conditions.

3. The method of claim 2 wherein the channel conditions measure a signal to noise ratio.

4. The method of claim 2 wherein the channel conditions measure an error rate.

5. The method of claim 2 wherein the channel conditions are updated periodically.

6. A transmitter for transmitting a stream of data symbols in a multiple-input/multiple-output wireless communications system including M pairs of transmitting antennas, comprising:

a demultiplexer generating M sub-streams from the stream of data;

an adaptive modulation coder coding each sub-stream to a maximum data rate while achieving a predetermine performance on an associated channel used to transmit the sub-stream;

a space-time transmit diversity encoder encoding each sub-stream into two output stream; and

an antenna for each output stream.

7. The transmitter of claim 6 comprising:

a receiver feeding back channel conditions of the associated channels; and

a rate selector signaling rate information to the adaptive modulation coders based on the channel conditions.

8. The transmitter of claim 7 wherein the receiver further comprises:

means for measuring a signal to noise ratio.

9. The transmitter of claim 7 wherein the receiver further comprises:

means for measuring an error rate.

10. A system for transmitting a stream of data symbols in a multiple-input/multiple-output wireless communications system including M pairs of transmitting antennas, comprising:

a demultiplexer configured to demultiplex the stream of data symbols into M sub-streams;

means for adaptively modulating and coding each sub-stream to a maximum data rate while achieving a predetermine performance on an associated channel used to transmit the sub-stream;

means for space-time transmit diversity encoding each coded sub-stream into two output streams, one output stream for each antenna.