Some content of this application is unavailable at the moment.
If this situation persist, please contact us atFeedback&Contact
1. (WO2004028022) METHOD AND APPARATUS FOR SELECTIVELY APPLYING INTERFERENCE CANCELLATION IN SPREAD SPECTRUM SYSTEMS
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

What is claimed is
1. A method for selectively enabling signal interference cancellation, comprising:
identifying a plurality of signal paths;
for a set of said identified signal paths, determining an observed signal strength;
identifying at least one of said signal paths as a potential interferer based at least in part on the observed signal strength; and
creating at least a first interference cancelled signal stream.
2. The method of Claim 1 , further comprising:
determining whether providing said at least a first interference cancelled signal stream to at least a first signal processor will improve a signal to noise ratio of at least a first signal path assigned to said at least a first signal processor; and
in response to determining that said at least a first interference cancelled signal stream will improve a signal to noise ratio of said signal path at least a first signal stream assigned to said at least a first signal processor, providing said at least a first interference cancelled signal stream to said at least a first signal processor.
3. The method of Claim 1 , further comprising:
determining whether providing said at least a first interference cancelled signal stream to said at least a first signal processor will improve a signal to noise ratio of at least a first signal path assigned to said at least a first signal processor;
in response to determining that said at least a first interference cancelled signal stream will not improve a signal to noise ratio of said at least a first signal path assigned to said at least a first signal processor, discontinuing said creating at least a first interference cancelled signal stream.
4. The method of Claim 3, further comprising:
providing a non-interference cancelled signal stream to said at least a first signal processor.
5. The method of Claim 1, wherein said set of identified signal paths comprises a set of assigned signal paths.
6. The method of Claim 5, wherein said set of assigned signal paths is obtained from a demodulation path list.

7. The method of Claim 1, wherein said identifying a plurality of potential interferers comprises identifying a first number of signal paths having at least a first signal strength.
8. The method of Claim 1, further comprising:
listing said potential interferers in a candidate to cancel list.
9. The method of Claim 8, further comprising updating a to cancel list by replacing a signal path in said to cancel list having a signal strength that is less than a signal strength of one of said potential interferers in said candidate to cancel list with said one of said potential interferers.
10. The method of Claim 1, further comprising updating a channel determination list by entering signal paths from said to cancel list in said channel determination list.
11. The method of Claim 1 , further comprising:
storing an identity of said plurality of signal paths in said channel to create a survey path list;
providing an interference canceled signal stream to a searcher element; and
updating said survey path list.
12. The method of Claim 1 , further comprising:
storing an identity of said plurality of signal paths to create a survey path list;
providing an interference canceled signal stream to a correlator element; and
updating said survey path list.
13. The method of Claim 1 , further comprising:
storing an identity of said at least a first interference cancelled signal.
14. A method for selectively enabling signal interference cancellation, comprising:
determining whether providing at least a first interference cancelled signal stream to at least a first signal processor will improve a signal to noise ratio of a signal path assigned to said at least a first signal processor; and
in response to determining that said at least a first interference cancelled signal stream will improve a signal to noise ratio of said at least a first signal processor, providing said at least a first interference cancelled signal stream to said at least a first signal processor.

15. The method of Claim 14, further comprising:
identifying a plurality of signal paths;
for a set of said identified signal paths, determining an observed signal strength; and
identifying at least one of said signal paths as a potential interferer.
16. The method of Claim 14, further comprising:
creating said at least a first interference cancelled signal stream.
17. The method of Claim 14, further comprising:
in response to determining that said at least a first interference cancelled signal stream will not improve a signal to noise ratio of another of said signal paths assigned to said at least a first signal processor, discontinuing said providing said at least a first interference cancelled signal stream to said at least a first signal processor.
18. The method of Claim 15 , further comprising:
identifying a plurality of said signal paths as potential interferers, wherein said identifying a plurality of potential interferers comprises identifying a first number of signal paths having at least a first signal strength.
19. An apparatus for canceling interfering signal paths, comprising:
a plurality of demodulation fingers;
a cancellation controller operable to selectively provide, in a first mode, an interference cancelled signal stream and, in a second mode, a non-interference cancelled signal stream to each of said plurality of demodulation fingers.
20. The apparatus of Claim 19, further comprising:
a searcher fmger, wherein said cancellation controller selectively provides one of an interference cancelled signal stream and a non-interference cancelled signal stream to said searcher finger.
21. The apparatus of Claim 19, wherein said cancellation controller comprises: a channel determination module operable to provide at least one replica of an interfering signal path; and
a signal cancellation module operable to remove said at least one replica of an interfering signal path from another signal stream.

22. The apparatus of Claim 21, wherein said cancellation controller further comprises:
a plurality of channel determination modules each of which is operable to provide a replica of an interfering signal path; and
a plurality of signal cancellation modules each operable to remove at least one replica of an interfering signal path from another signal stream.
23. The apparatus of Claim 22, wherein a number of demodulation fingers in said plurality of demodulation fingers is greater than a number of channel determination modules in said plurality of channel determination modules.
24. The apparatus of Claim 22, wherein a first number of demodulation fingers are included in said plurality of demodulation fingers, and wherein a like number of channel determination modules are included in said plurality of channel determination modules and a like number of signal cancellation modules are included in said plurality of signal cancellation modules.
25. The apparatus of Claim 19, wherein each of said demodulation fingers comprises a tracking module and a demodulation module.
26. A communications apparatus comprising:
means for receiving a raw signal stream;
means for demodulating a plurality of signal paths included in said raw signal stream;
means for canceling at least a first of said signal paths from said raw signal stream to form at least a first interference cancelled signal stream; and
means for selectively providing one of said raw signal stream and said interference cancelled signal stream to said means for demodulating.
27. The apparatus of Claim 77, wherein said means for selectively providing provides said interference cancelled signal stream to said means for demodulating in response to a determination that a strength of at least a second of said signal paths within said interference cancelled signal stream is greater than in said raw signal stream..
28. The apparatus of Claim 77, wherein said means for selectively providing provides said raw signal stream to said means for demodulating in response to a determination that a strength of at least a second of said signal paths within said raw signal stream is greater than in said interference cancelled stream.