Multiple channel wireless receiver

• US 20040198276A1
• Filed: 03/26/2002
• Published: 10/07/2004
• Est. Priority Date: 03/26/2002
• Status: Abandoned Application

• Current Assignee: Intek
• Original Assignee: Intek
• Inventors: Tellado, Jose, Dring, John
• Application Number:
  US10/107,124
• Publication Number:
  US 20040198276A1
• Time in Patent Office: Days
• US Class Current: 455/132
• CPC Class Codes: H04B 17/20 of receivers
• CPC Class Codes: H04B 7/0842 Weighted combining
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01

Abstract

The present invention provides a method and system for receiving a plurality of information signals at a receiver. The information signals each traveling through a corresponding transmission channel. The receiver includes a plurality of receiver channels, wherein each receiver channel receives a corresponding information signal. An amplitude of each received information signal associated with each receiver channel is adjusted so the amplitudes of all the received information signals are as great as possible, while still maintaining a target level of signal error of each of the received information signals. The amplitudes of the received information signals can be additionally adjusted so that the signal errors of each of the received information signals are approximately equal. Each receiver channel can be calibrated by measuring a noise reference and a distortion reference for aiding in the estimation of the received information bit stream. The received information signals can be multiple carrier signals, and calibrating each receiver channel can be accomplished by receiving the multiple carrier signals in which at least one sub-carrier of the received multiple carrier signals is nulled, and the noise reference and the distortion reference of each receiver channel are estimated during the reception of the nulled sub-carrier. The receiver can include spatial processing and demodulation that provides estimation of the received information bit stream for spatially multiplexed or transmit diversity received information signals.

Claims

1. A method of receiving a plurality of information signals at a receiver, the information signals each traveling through a corresponding transmission channel, the receiver comprising a plurality of receiver channels, a receiver channel corresponding to each transmission channel, the method comprising:

each receiver channel receiving a corresponding information signal;

adjusting an amplitude of each received information signal associated with each receiver channel so the amplitudes of all the received information signals are as great as possible, while still maintaining a target level of signal error of each of the received information signals.

2. The method of receiving a plurality of information signals at a receiver of claim 1, wherein the amplitudes of the received information signals are additionally adjusted so that the signal errors of each of the received information signals are approximately equal.

3. The method of receiving a plurality of information signals at a receiver of claim 1, further comprising signal processing the amplitude adjusted received information signals for enabling an estimation of a received information bit stream.

4. The method of receiving a plurality of information signals at a receiver of claim 3, wherein the signal processing comprises spatial processing and demodulation that provides estimation of the received information bit stream for spatially multiplexed received information signals.

5. The method of receiving a plurality of information signals at a receiver of claim 3, wherein the signal processing comprises spatial processing and demodulation that provides estimation of the received information bit stream for transmit diversity received information signals.

6. The method of receiving a plurality of information signals at a receiver of claim 1, further comprising calibrating each receiver channel by measuring a noise reference and a distortion reference for aiding in the estimation of the received information bit stream.

7. The method of receiving a plurality of information signals at a receiver of claim 6, wherein the signal error is estimated by a statistical summation of the noise reference and the distortion reference.

8. The method of receiving a plurality of information signals at a receiver of claim 7, wherein the amplitudes of the received information signals are additionally adjusted so that the signal error of each of the received information signals is approximately equal.

9. The method of receiving a plurality of information signals at a receiver of claim 7, wherein the amplitudes of the received information signals are additionally adjusted so that the signal error of each of the received information signals is approximately equal to a determined target error.

10. The method of receiving a plurality of information signals at a receiver of claim 9, wherein the target error is dynamic depending upon signal error.

11. The method of receiving a plurality of information signals at a receiver of claim 10, wherein the target error is determined by minimizing a normalize error signal.

12. The method of receiving a plurality of information signals at a receiver of claim 6, wherein the noise reference and the distortion reference are additionally used for adjustment of the amplitudes of the received information signals.

13. The method of receiving a plurality of information signals at a receiver of claim 6, wherein the noise reference and the distortion reference are additionally used for aiding in selection of a transmission mode of the information signals.

14. The method of receiving a plurality of information signals at a receiver of claim 6, wherein the received information signals are multiple carrier signals, and calibrating each receiver channel is accomplished by receiving multiple carrier signals in which at least one sub-carrier of the received multiple carrier signals is nulled, and the noise reference and the distortion reference of each receiver channel are estimated during the reception of the nulled sub-carrier.

15. The method of receiving a plurality of information signals at a receiver of claim 6, wherein the received information signals are multiple carrier signals, and calibrating each receiver channel is accomplished before the receiver is phase-locked to a transmitter of the information signals by estimating the noise reference and distortion reference of each receiver channel during reception of a zero time slot.

16. The method of receiving a plurality of information signals at a receiver of claim 6, wherein the received information signals are multiple carrier signals, and calibrating each receiver channel is accomplished after the receiver is phase-locked to a transmitter of the information signals by estimating the noise reference and distortion reference of each receiver channel during a zeroed sub-carrier.

17. The method of receiving a plurality of information signals at a receiver of claim 1, where in the amplitude adjustments of the received information signals is performed before the received information signals are digitally sampled, and after the received information signals are digitally sampled.

18. A method of receiving a plurality of information signals at a receiver, the information signals each traveling through a corresponding transmission channel, the receiver comprising a plurality of receiver channels, a receiver channel corresponding to each transmission channel, the method comprising:

each receiver channel receiving the corresponding information signal;

adjusting an amplitude of each received information signal associated with each receiver channel so the amplitudes of all the received information signals are approximately equal to a maximum target level; and

calibrating each of the received information signals so a signal error associated with each of the information signals is approximately equal for each of the received information signals.

19. The method of receiving a plurality of information signals at a receiver of claim 18, further comprising calibrating each receiver channel by measuring a noise reference and a distortion reference for aiding in the estimation of the received information bit stream.

20. The method of receiving a plurality of information signals at a receiver of claim 19, wherein the signal error is estimated by summing the noise reference and the distortion reference.

21. The method of receiving a plurality of information signals at a receiver of claim 19, wherein the amplitudes of the received information signals are additionally adjusted so that the signal error of each of the received information signals is approximately equal.

22. The method of receiving a plurality of information signals at a receiver of claim 19, wherein the noise reference and the distortion reference are additionally used for adjustment of the amplitudes of the received information signals.

23. The method of receiving a plurality of information signals at a receiver of claim 19, wherein the noise reference and the distortion reference are additionally used for aiding in selection of a transmission mode of the information signals.

24. The method of receiving a plurality of information signals at a receiver of claim 19, wherein the received information signals are multiple carrier signals, and calibrating each receiver channel is accomplished by receiving multiple carrier signals in which at least one sub-carrier of the received multiple carrier signals is nulled, and the noise reference and the distortion reference of each receiver channel are estimated during the reception of the nulled sub-carrier.

25. The method of receiving a plurality of information signals at a receiver of claim 19, wherein the received information signals are multiple carrier signals, and calibrating each receiver channel is accomplished before the receiver is phase-locked to a transmitter of the information signals by estimating the noise reference and distortion reference of each receiver channel during reception of a zero time slot.

26. The method of receiving a plurality of information signals at a receiver of claim 19, wherein the received information signals are multiple carrier signals, and calibrating each receiver channel is accomplished after the receiver is phase-locked to a transmitter of the information signals by estimating the noise reference and distortion reference of each receiver channel during a zeroed sub-carrier.

27. The method of receiving a plurality of information signals at a receiver of claim 18, further comprising monitoring a noise reference and a distortion reference.

28. The method of receiving a plurality of information signals at a receiver of claim 18, wherein the maximum target level is determined by a determined target_signal value.

29. The method of receiving a plurality of information signals at a receiver of claim 28, wherein the determined target_signal value is dynamically adjusted depending upon characterizations of the noise reference and the distortion reference.

30. The method of receiving a plurality of information signals at a receiver of claim 18, wherein the signal error associated with each of the information signals is adjusted to be substantially equal to a determined target_error value.

31. The method of receiving a plurality of information signals at a receiver of claim 30, wherein the determined target_error value is dynamically adjusted depending upon characterizations of the noise reference and the distortion reference.

32. The method of receiving a plurality of information signals at a receiver of claim 19, wherein the received information signals are multiple carrier signals, and the noise reference is determined by zeroing odd tones of the multiple carrier signals.

33. The method of receiving a plurality of information signals at a receiver of claim 19, wherein the distortion reference is determined by zeroing a plurality of the multiple carrier signals, and the noise reference is determined by zeroing all of the multiple carrier signals.

34. The method of receiving a plurality of information signals at a receiver of claim 19, wherein the noise reference and the distortion reference are determined as a statistic of noise and distortion over a plurality of time intervals.