Systems and methods for parallel signal cancellation

Patent metadata

Field	Value
Publication number	US-9490857-B2
Application number	US-201514925515-A
Country	US
Kind code	B2
Filing date	Oct 28, 2015
Priority date	Sep 20, 2002
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

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.

First claim

The invention claimed is:

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.

Assignees

• Iii Holdings 1 Llc

Inventors

• Narayan Anand P
• Thomas John K
• Olson Eric S

Classifications

• H04B1/712

  Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop · CPC title

• H04J13/0022

  PN, e.g. Kronecker · CPC title

• H04B1/7107 Primary

  Subtractive interference cancellation · CPC title

• H04B7/0678

  using different spreading codes between antennas (code allocation H04J13/16) · CPC title

• H04B1/126 Primary

  having multiple inputs, e.g. auxiliary antenna for receiving interfering signal (aerials in general H01Q) · CPC title