Method and system for weight determination in a spatial multiplexing MIMO system for WCDMA/HSDPA

• US 7,483,675 B2
• Filed: 06/30/2005
• Issued: 01/27/2009
• Est. Priority Date: 10/06/2004
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Kent, Mark, Landau, Uri M., Erceg, Vinko, Rooyen, Pieter Van
• Primary Examiner(s): Anderson; Matthew D.
• Assistant Examiner(s): Nguyen; Hai V
• Application Number:
  US11/172,759
• Publication Number:
  US 20060073790A1
• Time in Patent Office: 1,307 Days
• Field of Search: 455/67.11
• US Class Current: 455/67.11
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04B 7/0857 using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information

Abstract

Certain aspects of the method may comprise generating models for a received plurality of spatially multiplexed communication signals for multiple channels from a plurality of transmit antennas. A calculated signal to noise ratio (SNR) of each multiple channel may be maximized based on the generated models. A phase and an amplitude of at least a portion of the received plurality of spatially multiplexed communication signals may be adjusted based on a plurality of amplitude and phase correction weights determined from the maximized SNR.

Claims

1. A method for processing signals in a communication system, the method comprising:

generating models for a received plurality of spatially multiplexed communication signals for multiple channels from a plurality of transmit antennas;

maximizing a calculated signal to noise ratio (SNR) of each of said multiple channels based on said generated models; and

adjusting a phase and an amplitude of at least a portion of said received plurality of spatially multiplexed communication signals based on a generated plurality of amplitude and phase correction weights determined from said maximizing.

2. The method according to claim 1, comprising determining whether said received plurality of spatially multiplexed communication signals are noise limited.

3. The method according to claim 1, comprising calculating said SNR of each of said multiple channels if said received plurality of spatially multiplexed communication signals are noise limited.

4. The method according to claim 1, comprising determining whether a plurality of interfering signals are present if said received plurality of spatially multiplexed communication signals are not noise limited.

5. The method according to claim 4, comprising calculating signal to interference and noise ratio (SINR) of each of said multiple channels if a plurality of interfering signals are not present.

6. The method according to claim 5, comprising calculating said SINR of each of said multiple channels at a plurality of delays if a plurality of interfering signals are present.

7. The method according to claim 6, comprising maximizing said calculated SINR of each of said multiple channels based on said generated models.

8. The method according to claim 7, comprising generating said plurality of amplitude and phase correction weights based on said maximizing.

9. The method according to claim 1, comprising spatially demultiplexing said received plurality of spatially multiplexed communication signals.

10. The method according to claim 1, comprising generating a plurality of vectors of baseband combined channel estimates based on phase rotation in response to said receiving of said plurality of spatially multiplexed communication signals.

11. A system for processing signals in a communication system, the system comprising:

one or more circuits that enables generation of models for a received plurality of spatially multiplexed communication signals for multiple channels from a plurality of transmit antennas;

said one or more circuits enables maximization of a calculated signal to noise ratio (SNR) of each of said multiple channels based on said generated models; and

said one or more circuits enables adjustment of a phase and an amplitude of at least a portion of said received plurality of spatially multiplexed communication signals based on a generated plurality of amplitude and phase correction weights determined from said maximizing.

12. The system according to claim 11, wherein said one or more circuits enables determining whether said received plurality of spatially multiplexed communication signals are noise limited.

13. The system according to claim 11, wherein said one or more circuits enables calculation of said SNR of each of said multiple channels if said received plurality of spatially multiplexed communication signals are noise limited.

14. The system according to claim 11, wherein said one or more circuits enables determining whether a plurality of interfering signals are present if said received plurality of spatially multiplexed communication signals are not noise limited.

15. The system according to claim 14, wherein said one or more circuits enables calculation of signal to interference and noise ratio (SINR) of each of said multiple channels if a plurality of interfering signals are not present.

16. The system according to claim 15, wherein said one or more circuits enables calculation of said SINR of each of said multiple channels at a plurality of delays if a plurality of interfering signals are present.

17. The system according to claim 16, wherein said one or more circuits enables maximization of said calculated SINR of each of said multiple channels based on said generated models.

18. The system according to claim 17, wherein said one or more circuits enables generation of said plurality of amplitude and phase correction weights based on said maximizing.

19. The system according to claim 11, wherein said one or more circuits enables spatial demultiplexing of said received plurality of spatially multiplexed communication signals.

20. The system according to claim 11, wherein said one or more circuits enables generation of a plurality of vectors of baseband combined channel estimates based on phase rotation in response to said receiving of said plurality of spatially multiplexed communication signals.