Space time encoded wireless communication system with multipath resolution receivers

• US 7,386,076 B2
• Filed: 03/26/2002
• Issued: 06/10/2008
• Est. Priority Date: 03/29/2001
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Onggosanusi, Eko N., Dabak, Anand G
• Primary Examiner(s): Phu; Phuong
• Application Number:
  US10/107,275
• Publication Number:
  US 20030016640A1
• Time in Patent Office: 2,268 Days
• Field of Search: 375/267, 375/299, 375/348, 375/347, 375/349, 375/350, 375/331, 375/332, 375/344
• US Class Current: 375/347
• CPC Class Codes: H04L 1/0618 Space-time coding
• CPC Class Codes: H04L 2025/03605 Block algorithms
• CPC Class Codes: H04L 25/03114 non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals

Abstract

A wireless receiver (30₁) for receiving multiple space time encoded signals from a plurality of transmit antenna sets (TAT₁ through TAT₂, and TAT₃ through TAT₄), wherein the multiple space time encoded signals comprise a set of symbols and wherein each transmit antenna set is coupled to a corresponding encoder (22₁, 22₂) at a single transmitter (12₁). The receiver comprises a plurality of receive antennas (RAT₁ through RAT_Q) and collection circuitry (32), coupled to the plurality of receive antennas, for collecting a plurality of signal samples for a plurality of successive time instances and from each of the plurality of receive antennas. The collected samples comprise samples of multipaths of the space time encoded signals. The receiver also comprises circuitry (34, 36), coupled to the plurality of receive antennas, for determining a linear time invariant multiple-input multiple-output matrix in response to pilot values in the received multiple space time encoded signals. Finally, the receiver comprise circuitry (40, 42₁, 44₁) for estimating at least selected ones of the symbols in response to the signal samples and the linear time invariant multiple-input multiple-output matrix.

Claims

1. A wireless receiver for receiving multiple space time encoded signals, the receiver comprising:

a plurality of receive antennas;

collection circuitry, coupled to the plurality of receive antennas, for collecting a plurality of signal samples, wherein the samples comprise samples of multipaths of the space time encoded signals;

circuitry, coupled to the plurality of receive antennas, for determining a linear time invariant multiple-input multiple-output matrix in response to pilot values in the received multiple space time encoded signals;

circuitry, coupled to the collection circuitry, for suppressing interference effects caused by the samples of multipaths and producing a yield signal in response to the plurality of signal samples and the linear time invariant multiple-input multiple-output matrix; and

circuitry for estimating at least selected ones of the symbols in response to the yield signal.

2. The receiver of claim 1 wherein the plurality of signal samples are collected for a plurality of successive time instances and from each of the plurality of receive antennas.

3. The receiver of claim 1:

wherein the multiple space time encoded signals comprise a set of symbols spanning a plurality of symbol times; and

wherein the collection circuitry is for collecting a plurality of signal samples for a plurality of successive time instances exceeding the plurality of symbol times.

4. The receiver of claim 1 wherein the multiple space time encoded signals comprise multiple space-time transmit diversity signals.

5. The receiver of claim 4 wherein the multiple space-time transmit diversity signals are transmitted by the single transmitter using a code division multiple access format.

6. The receiver of claim 5 wherein the circuitry for suppressing interference effects caused by the samples of multipaths comprises interference cancellation circuitry.

7. The receiver of claim 6 and further comprising joint interference cancellation and space time decode circuitry, wherein the joint interference cancellation and space time decode circuitry comprises the interference cancellation circuitry.

8. The receiver of claim 7:

and further comprising circuitry for determining a complex conjugate of the plurality of signal samples; and

wherein the joint interference cancellation and space time decode circuitry is responsive to the plurality of signal samples and the complex conjugate of the plurality of signal samples.

9. The receiver of claim 8:

and further comprising circuitry for determining a complex conjugate of the linear time invariant multiple-input multiple-output matrix; and

wherein the joint interference cancellation and space time decode circuitry is further responsive to the complex conjugate of the linear time invariant multiple-input multiple-output matrix.

10. The receiver of claim 1, wherein, the multiple space time encoded signals are selected from the group consisting of multiple space-time transmit diversity signals, multiple orthogonal transmit diversity signals, multiple phase-shift transmit diversity signals, multiple time-switched transmit diversity signals, and multiple STS signals.

11. A wireless receiver for receiving multiple space time encoded signals, the receiver comprising:

a plurality of receive antennas;

collection circuitry, coupled to the plurality of receive antennas, for collecting a plurality of signal samples for a plurality of successive time instances and from each of the plurality of receive antennas, wherein the samples comprise samples of multipaths of the space time encoded signals;

circuitry, coupled to the plurality of receive antennas, for determining a linear time invariant multiple-input multiple-output matrix in response to pilot values in the received multiple space time encoded signals;

circuitry, coupled to the collection circuitry, for suppressing interference effects caused by the samples of multipaths and producing a yield signal in response to the plurality of signal samples and the linear time invariant multiple-input multiple-output matrix; and

circuitry for estimating at least selected ones of the symbols in response to the yield signal;

wherein the multiple space time encoded signals comprise a set of symbols spanning a plurality of symbol times;

wherein the collection circuitry is for collecting a plurality of signal samples for a plurality of successive time instances exceeding the plurality of symbol times;

wherein the multiple space time encoded signals are selected from a group consisting of multiple space-time transmit diversity signals, multiple orthogonal transmit diversity signals, multiple phase-shift transmit diversity signals, multiple time-switched transmit diversity signals, and multiple space time spreading signals.

12. The receiver of claim 11 wherein the multiple space time encoded signals are transmitted by the single transmitter using a format selected from a group consisting of a code division multiple access format and a time division multiple access format.

13. A method of operating a wireless receiver comprising:

receiving, along a plurality of receive antennas, multiple space time encoded signals from a plurality of transmit antenna sets, wherein the multiple space time encoded signals comprise a set of symbols and wherein each transmit antenna set is coupled to a corresponding encoder at a single transmitter;

collecting, from the plurality of receive antennas, a plurality of signal samples, wherein the samples comprise samples of multipaths of the space time encoded signals;

determining a linear time invariant multiple-input multiple-output matrix in response to pilot values in the received multiple space time encoded signals;

suppressing interference effects caused by the samples of multipaths;

producing a yield signal in response to the samples of multipaths and the linear time invariant multiple-input multiple-output matrix; and

estimating at least selected ones of the symbols in response to the yield signal.

14. The method of claim 13 wherein the plurality of signal samples are collected for a plurality of successive time instances and from each of the plurality of receive antennas.

15. The method of claim 13 wherein the multiple space time encoded signals comprise a set of symbols spanning a plurality of symbol times;

and

wherein the collecting step collects a plurality of signal samples for a plurality of successive time instances exceeding the plurality of symbol times.

16. The method of claim 13 wherein the multiple space time encoded signals comprise multiple space-time transmit diversity signals.

17. The method of claim 16 wherein the multiple space-time transmit diversity signals are transmitted by the single transmitter using a code division multiple access format.