Communication receiver with hybrid equalizer

• US 7,646,802 B2
• Filed: 07/28/2003
• Issued: 01/12/2010
• Est. Priority Date: 06/02/2003
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Howard, Michael A., Black, Peter J.
• Primary Examiner(s): Wang; Ted M
• Application Number:
  US10/629,157
• Publication Number:
  US 20040240531A1
• Time in Patent Office: 2,360 Days
• Field of Search: 375/147, 375/229, 375/331, 375231-233, 375/136, 375/142, 375/150, 375/152, 375/316
• US Class Current: 375/147
• CPC Class Codes: H04B 1/7115 Constructive combining of multi-path signals, i.e. RAKE receivers
• CPC Class Codes: H04B 1/7117 Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers
• CPC Class Codes: H04B 2201/7071 with dynamic control of receiver resources
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 2025/03547 Switching between time domain structures
• CPC Class Codes: H04L 25/03019 adaptive, i.e. capable of adjustment during data reception

Abstract

Wireless communication receiver with hybrid equalizer and RAKE receiver. The receiver compares performance of the system for RAKE only and RAKE in combination with equalizer estimates. The receiver enables or disables the equalizer accordingly.

Claims

1. A method of receiving data in a wireless communication system, comprising:

comparing a first metric associated with a RAKE processing element to a second metric associated with an equalizer, wherein said first and second metrics are respective wireless communication channel metrics; and

based on said comparing, determining whether to transition from one of first and second modes of data reception to the other of said first and second modes of data reception;

wherein said first mode of data reception is defined by a first combination of respective operational states of the RAKE processing element and the equalizer;

wherein said second mode of data reception is defined by a second combination of respective operational states of the RAKE processing element and the equalizer;

wherein said first combination of operational states differs from said second combination of operational states; and

wherein said wireless communication channel metrics are channel speed metrics.

2. The method of claim 1, wherein each of said channel speed metrics includes signal correlation information.

3. A method of receiving data in a wireless communication system, comprising:

comparing a first metric associated with a RAKE processing element to a second metric associated with an equalizer; and

based on said comparing, determining whether to transition from one of first and second modes of data reception to the other of said first and second modes of data reception;

wherein said first mode of data reception is defined by a first combination of respective operational states of the RAKE processing element and the equalizer;

wherein said second mode of data reception is defined by a second combination of respective operational states of the RAKE processing element and the equalizer;

wherein said first combination of operational states differs from said second combination of operational states; and

wherein said comparing includes comparing one of said first and second metrics to a biased version of the other of said first and second metrics.

4. The method of claim 3, wherein said one metric is said first metric.

5. The method of claim 3, wherein said one metric is said second metric.

6. A method of receiving data in a wireless communication system, comprising:

comparing a first metric associated with a RAKE processing element to a second metric associated with an equalizer; and

based on said comparing, determining whether to transition from one of first and second modes of data reception to the other of said first and second modes of data reception;

wherein said first mode of data reception is defined by a first combination of respective operational states of the RAKE processing element and the equalizer;

wherein said second mode of data reception is defined by a second combination of respective operational states of the RAKE processing element and the equalizer;

wherein said first combination of operational states differs from said second combination of operational states and;

wherein said one mode of data reception is a periodically activated test mode in which the RAKE processing element and the equalizer are enabled for operation concurrently.

7. The method of claim 6, wherein the RAKE processing element is enabled for operation and the equalizer is disabled from operation in said other mode of data reception.

8. The method of claim 6, including periodically transitioning from said other mode of data reception to said one mode of data reception.

9. The method of claim 8, wherein the RAKE processing element is enabled for operation and the equalizer is disabled from operation in said other mode of data reception.

10. A wireless communication apparatus, comprising:

an input for receiving data signals via a wireless communication link;

a RAKE processing element coupled to said input;

an equalizer coupled to said input and co-operable with said RAKE processing element to define first and second modes of data reception in said wireless communication apparatus; and

a controller coupled to said RAKE processing element and said equalizer, said controller making a determination of whether said wireless communication apparatus is to transition from one of said first and second modes of data reception to the other of said first and second modes of data reception, said controller making said determination based on a comparison of a first metric associated with said RAKE processing element to a second metric associated with said equalizer;

wherein said first mode of data reception is defined by a first combination of respective operational states of the RAKE processing element and the equalizer;

wherein said second mode of data reception is defined by a second combination of respective operational states of the RAKE processing element and the equalizer; and

wherein said first combination of operational states differs from said second combination of operational states.

11. The apparatus of claim 10, wherein the RAKE processing element and the equalizer are enabled for operation concurrently in said first mode of data reception.

12. The apparatus of claim 11, wherein the RAKE processing element is enabled for operation and the equalizer is disabled from operation in said second mode of data reception.

13. The apparatus of claim 10, wherein said one mode of data reception is a periodically activated test mode in which the RAKE processing element and the equalizer are enabled for operation concurrently.

14. The apparatus of claim 13, wherein the RAKE processing element is enabled for operation and the equalizer is disabled from operation in said other mode of data reception.

15. The apparatus of claim 13, including periodically transitioning from said other mode of data reception to said one mode of data reception.

16. The apparatus of claim 15, wherein the RAKE processing element is enabled for operation and the equalizer is disabled from operation in said other mode of data reception.

17. The apparatus of claim 10, wherein said first and second metrics are respective wireless communication channel metrics.

18. The apparatus of claim 17, wherein said wireless communication channel metrics are channel quality metrics.

19. The apparatus of claim 18, wherein each of said channel quality metrics includes signal-to-noise ratio information.

20. The apparatus of claim 17, wherein said wireless communication channel metrics are channel speed metrics.

21. The apparatus of claim 20, wherein each of said channel speed metrics includes signal correlation information.

22. The apparatus of claim 17, wherein each of said wireless communication channel metrics includes signal correlation information.

23. The apparatus of claim 10, wherein said comparing includes comparing one of said first and second metrics to a biased version of the other of said first and second metrics.

24. The apparatus of claim 23, wherein said one metric is said first metric.

25. The apparatus of claim 23, wherein said one metric is said second metric.