Method and system for achieving space and time diversity gain

• US 8,036,296 B2
• Filed: 09/28/2006
• Issued: 10/11/2011
• Est. Priority Date: 09/28/2006
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Kong, Ning, Sung, Sang Hun, Koekemoer, Philip, Botha, Louis
• Primary Examiner(s): ODOM, CURTIS B
• Application Number:
  US11/536,368
• Publication Number:
  US 20080080633A1
• Time in Patent Office: 1,839 Days
• Field of Search: 375/130, 375/137, 375/143, 375/152, 375/267
• US Class Current: 375/267
• CPC Class Codes: H04B 1/7103 the interference being multiple access interference
• CPC Class Codes: H04B 1/7113 Determination of path profile
• CPC Class Codes: H04B 1/7115 Constructive combining of multi-path signals, i.e. RAKE receivers
• CPC Class Codes: H04B 2201/70714 Reducing hardware requirements
• CPC Class Codes: H04B 2201/7097 Direct sequence modulation interference
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0678 using different spreading codes between antennas code allocation H04J13/16
• CPC Class Codes: H04B 7/0897 using beamforming per multi-path, e.g. to cope with different directions of arrival [DOA] at different multi-paths

Abstract

Certain aspects of a method and system for achieving space and time diversity gain are disclosed. Aspects of one method may include modifying a generalization code of at least one pilot channel, to measure signal strengths for each of a plurality of received multipath signals. A portion of the plurality of received multipath signals may be combined based on the measured signal strengths. The signal strengths of the plurality of received multipath signals may be measured on a primary pilot channel by assigning its generalization code to zero. The signal strengths of the plurality of received multipath signals on a secondary pilot channel may measured by assigning its generalization code to a non-zero value.

Claims

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

performing by one or more processors and/or circuits, functions comprising;

modifying a generalization code of at least one pilot channel to measure signal strengths for each of a plurality of received multipath signals;

selecting a portion of said plurality of said received multipath signals, wherein said measured signal strengths of said selected portion are greater than said measured signal strengths of a remaining portion of said plurality of said received multipath signals; and

combining said selected portion of said plurality of said received multipath signals.

2. The method according to claim 1, said functions comprising measuring a signal to noise ratio (SNR) of said plurality of said received multipath signals.

3. The method according to claim 1, said functions comprising measuring said signal strengths of said plurality of said received multipath signals on a primary pilot channel by assigning said generalization code to zero.

4. The method according to claim 1, said functions comprising measuring said signal strengths of said plurality of said received multipath signals on a secondary pilot channel by assigning said generalization code to a non-zero value.

5. The method according to claim 1, wherein:

said combining comprises combining at least a portion of said selected portion of said plurality of said received multipath signals; and

said at least said portion of said selected portion of said plurality of said received multipath signals comprises a SNR that is higher than a particular threshold.

6. The method according to claim 1, wherein said combining comprises combining said selected portion of said plurality of said received multipath signals utilizing maximal ratio combining algorithm.

7. The method according to claim 1, said functions comprising generating one or more of:

multipath signal timing information, antenna index, and/or maximal ratio combining weights of said selected portion of plurality of said received multipath signals.

8. A machine-readable storage having stored thereon, a computer program having at least one code section for achieving diversity gain in a communication network, the at least one code section being executable by a machine for causing the machine to perform steps comprising:

modifying a generalization code of at least one pilot channel to measure signal strengths for each of a plurality of received multipath signals;

selecting a portion of said plurality of said received multipath signals, wherein said measured signal strengths of said selected portion are greater than said measured signal strengths of a remaining portion of said plurality of said received multipath signals; and

combining a said selected portion of said plurality of said received multipath signals.

9. The machine-readable storage according to claim 8, comprising code for measuring a signal to noise ratio (SNR) of said plurality of said received multipath signals.

10. The machine-readable storage according to claim 8, comprising code for measuring said signal strengths of said plurality of said received multipath signals on a primary pilot channel by assigning said generalization code to zero.

11. The machine-readable storage according to claim 8, comprising code for measuring said signal strengths of said plurality of said received multipath signals on a secondary pilot channel by assigning said generalization code to a non-zero value.

12. The machine-readable storage according to claim 8, wherein:

said combining comprises combining at least a portion of said selected portion of said plurality of said received multipath signals; and

said at least said portion of said selected portion of said plurality of said received multipath signals comprises a SNR that is higher than a particular threshold.

13. The machine-readable storage according to claim 8, comprising code for combining said selected portion of said plurality of said received multipath signals utilizing a maximal ratio combining algorithm.

14. The machine-readable storage according to claim 8, comprising code for generating one or more of:

multipath signal timing information, antenna index, and/or maximal ratio combining weights of said selected portion of plurality of said received multipath signals.

15. A system for achieving diversity gain in a communication network, the system comprising:

one or more circuits that are operable to modify a generalization code of at least one pilot channel to measure signal strengths for each of a plurality of received multipath signals;

said one or more circuits are operable to select a portion of said plurality of said received multipath signals, wherein said measured signal strengths of said selected portion are greater than said measured signal strengths of a remaining portion of said plurality of said received multipath signals; and

said one or more circuits are operable to combine said selected portion of said plurality of said received multipath signals.

16. The system according to claim 15, wherein said one or more circuits are operable to measure a signal to noise ratio (SNR) of said plurality of said received multipath signals.

17. The system according to claim 15, wherein said one or more circuits are operable to measure said signal strengths of said plurality of said received multipath signals on a primary pilot channel by assigning said generalization code to zero.

18. The system according to claim 15, wherein said one or more circuits are operable to measure said signal strengths of said plurality of said received multipath signals on a secondary pilot channel by assigning said generalization code to a non-zero value.

19. The system according to claim 15, wherein:

said combining comprises combining at least a portion of said selected portion of said plurality of said received multipath signals; and

said at least said portion of said selected portion of said plurality of said received multipath signals comprises a SNR that is higher than a particular threshold.

20. The system according to claim 15, wherein said one or more circuits are operable to combine said selected portion of said plurality of said received multipath signals utilizing a maximal ratio combining algorithm.

21. The system according to claim 15, wherein said one or more circuits are operable to generate one or more of:

multipath signal timing information, antenna index, and/or maximal ratio combining weights of said selected portion of plurality of said received multipath signals.