Systems and methods for parallel signal cancellation

• US 9,490,857 B2
• Filed: 10/28/2015
• Issued: 11/08/2016
• Est. Priority Date: 09/20/2002
• Status: Active Grant

• Current Assignee: III Holdings 1, LLC
• Original Assignee: III Holdings 1, LLC
• Inventors: Narayan, Anand P., Thomas, John K., Olson, Eric S.
• Primary Examiner(s): Aghdam, Freshteh N
• Application Number:
  US14/925,515
• Publication Number:
  US 20160049974A1
• Time in Patent Office: 377 Days
• Field of Search: 375/346
• US Class Current: 1/1
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04B 1/1081 Reduction of multipath noise by equalising H04B7/005
• CPC Class Codes: H04B 1/126 having multiple inputs, e.g. auxiliary antenna for receiving interfering signal aerials in general H01Q
• CPC Class Codes: H04B 1/7105 Joint detection techniques, e.g. linear detectors
• CPC Class Codes: H04B 1/7107 Subtractive interference cancellation
• 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 1/712 Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop
• CPC Class Codes: H04B 2001/1045 Adjacent-channel interference
• CPC Class Codes: H04B 2201/70719 CDMA2000
• CPC Class Codes: H04B 2201/70979 Fat finger issues in RAKE receivers
• CPC Class Codes: H04B 7/0678 using different spreading codes between antennas code allocation H04J13/16
• CPC Class Codes: H04B 7/0891 Space-time diversity rake receivers H04B1/7115; space-time decoding H04L1/0631
• CPC Class Codes: H04J 13/0022 PN, e.g. Kronecker
• CPC Class Codes: H04J 13/20 having an orthogonal variable spreading factor [OVSF]

Abstract

A receiver includes a first finger that receives a non-interference-cancelled signal and output first demodulated data, a first phase estimate, and a first PN code. The receiver also includes a second finger that selectively receives the non-interference-cancelled signal and a first interference-cancelled signal generated from the non-interference-cancelled signal based on the first phase estimate and the first PN code. The second finger also outputs second demodulated data.

Claims

1. A receiver comprising:

a first finger configured to receive a non-interference-cancelled signal and output first demodulated data, a first phase estimate, and a first PN code;

a second finger configured to;

selectively receive the non-interference-cancelled signal and a first interference-cancelled signal generated from the non-interference-cancelled signal based on the first phase estimate and the first PN code; and

output second demodulated data; and

a selector configured to selectively provide the non-interference-cancelled signal or the first interference-canceled signal to the second finger.

2. The receiver of claim 1, wherein the receiver comprises a rake receiver.

3. The receiver of claim 1, wherein the non-interference-cancelled signal comprises a code-division multiple access (CDMA) signal.

4. The receiver of claim 3, wherein the first interference-cancelled signal comprises a CDMA signal.

5. The receiver of claim 1, wherein the first finger outputs the first demodulated data and the second finger outputs the second demodulated data simultaneously.

6. The receiver of claim 1, wherein the second finger is further configured to output a second phase estimate and a second PN code.

7. The receiver of claim 6, further comprising a third finger configured to:

selectively receive the non-interference-cancelled signal, the first interference-cancelled signal, and a second interference-cancelled signal generated from the non-interference-cancelled signal based on the second phase estimate and the second PN code; and

output third demodulated data.

8. The receiver of claim 7, wherein the non-interference-cancelled signal comprises a CDMA signal.

9. The receiver of claim 8, wherein the first interference-cancelled signal and the second interference-cancelled signal comprise a CDMA signal.

10. The receiver of claim 1, wherein the first finger outputs the first demodulated data, the second finger outputs the second demodulated data, and the third finger output the third demodulated data simultaneously.

11. The receiver of claim 7, wherein the third finger is configured to output a third phase estimate and a third PN code.

12. A method comprising:

receiving, at a first receiver finger, a non-interference-cancelled signal;

outputting, by the first receiver finger, first demodulated data, a first phase estimate, and a first PN code;

selecting one of the non-interference-cancelled signal or a first interference-cancelled signal;

receiving, at a second receiver finger, the selected one of the non-interference-cancelled signal or the first interference-cancelled signal; and

outputting, by the second receiver finger, second demodulated data.

13. The method of claim 12, wherein the non-interference-cancelled signal comprises a code-division multiple access (CDMA) signal.

14. The method of claim 13, wherein the first interference-cancelled signal comprises a CDMA signal.

15. The method of claim 12, wherein the first receiver finger outputs the first demodulated data and the second receiver finger outputs the second demodulated data simultaneously.

16. The method of claim 12, further comprising outputting, by the second receiver finger, a second phase estimate and a second PN code.

17. The method of claim 16, further comprising:

receiving, at a third receiver finger, a selected one of the non-interference-cancelled signal, the first interference-cancelled signal, and a second interference-cancelled signal generated from the non-interference-cancelled signal based on the second phase estimate and the second PN code; and

outputting, by the third receiver finger, third demodulated data.

18. The method of claim 17, wherein the first finger outputs the first demodulated data, the second finger outputs the second demodulated data, and the third finger output the third demodulated data simultaneously.

19. The method of claim 17, further comprising outputting, by the third receiver finger, a third phase estimate and a third PN code.