Andrew K Kan

US Patent:

7116957, Oct 3, 2006

Filed:

Oct 22, 2001

Appl. No.:

09/986222

Inventors:

Gilbert Christopher Sih - San Diego CA, US
Andrew Kan - Sunnyvale CA, US
Stein A. Lundby - Solana Beach CA, US
Shimman Patel - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04B 1/06

US Classification:

455266, 455307, 455339

Abstract:

The velocity of a wireless communications device () is estimated. In response to this estimate, a filter bandwidth, such as a pilot filter () bandwidth, is adjusted so that the introduction of noise and distortion to a signal received by the device is mitigated. The filter bandwidth is adjusted by increasing it as the estimated velocity increases; and decreasing it as the estimated velocity decreases. Such adjustments may be accomplished through providing a number of predetermined bandwidths that each correspond to a particular velocity range, and setting the filter bandwidth to the predetermined bandwidth that corresponds to the estimated velocity.

US Patent:

20030065697, Apr 3, 2003

Filed:

Oct 17, 2001

Appl. No.:

09/981130

Inventors:

Shimman Patel - San Diego CA, US
Andrew Kan - San Diego CA, US
Rajat Dhawan - San Diego CA, US

International Classification:

G06F007/38

US Classification:

708/491000

Abstract:

A fast, iterative techique for evaluating M modulo J which may be easily implemented in hardware. In the illustrative embodiment, the invention includes a first circuit () for decomposing M into two integers A and B=M-A; a second circuit () for evaluating (A modulo J); a third circuit () for evaluating M′=(A modulo J)+B; and, a fourth circuit () for determining whether to output M′ as the final answer, or to feedback M′ to said first means to evaluate M′ modulo J.

US Patent:

20030198283, Oct 23, 2003

Filed:

Apr 22, 2002

Appl. No.:

10/128392

Inventors:

Shimman Patel - San Diego CA, US
Andrew Kan - Sunnyvale CA, US

International Classification:

H04K001/00
H04B001/707

US Classification:

375/147000

Abstract:

A method and apparatus to dynamically adjust parameters of a filter for a pilot signal. An incoming signal containing a pilot signal is filtered using non-identical filters, and the magnitudes of the filtered signals are compared to estimate a bandwidth of the pilot signal. Noise in the incoming signal may also be estimated, preferably from a portion of the incoming signal not expected to contain the pilot signal. Based on the comparison of the filtered signal magnitudes, which may be compensated to remove the noise contribution, the parameters of a filter applied to the incoming signal to isolate the pilot signal are varied. The parameters may vary the bandwidth of a pilot signal filter. The non-identical filters used in the pilot signal bandwidth estimation may be IIR or FIR filters having different passbands, or may be a correlation of the incoming signal with sinusoids of different frequencies.

US Patent:

20120093269, Apr 19, 2012

Filed:

Oct 18, 2010

Appl. No.:

12/906328

Inventors:

Yingqun Yu - San Diego CA, US
Farrokh Abrishamkar - San Diego CA, US
Wenjun Li - San Diego CA, US
Andrew K. Kan - San Diego CA, US

Assignee:

QUALCOMM INCORPORATED - San Diego CA

International Classification:

H04B 1/10

US Classification:

375346

Abstract:

An apparatus and method for a two-stage linear/nonlinear interference cancellation comprising processing a receive signal to produce a first descrambled signal; and processing the first descrambled signal to produce a detected signal. In one aspect, a first interference canceller module is used for processing the received signal and a second interference canceller module is used for processing the first descrambled signal. In one aspect, the first interference canceller is a linear interference canceller (IC) and the second interference canceller is a linear/nonlinear interference canceller (IC).