Brian B Dong

US Patent:

8126031, Feb 28, 2012

Filed:

Aug 7, 2007

Appl. No.:

11/834685

Inventors:

Brian Dong - Cambridge MA, US
Javad Razavilar - San Diego CA, US
Manini S. Shah - San Diego CA, US
Nathaniel Chittenden - Sunnyvale CA, US
Valibabu Saladi - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04B 1/00
H04B 1/10
H04B 7/216
H04L 7/00

US Classification:

375148, 375130, 375140, 375144, 375147, 375349, 375355, 370335, 370342, 455101, 455132

Abstract:

A rake receiver comprises a plurality of receive antennas and a processing system. Each receive antenna has a plurality of demodulation elements. The processing system is configured to assign a plurality of demodulation elements from a plurality of receive antennas to a multipath group, assign the multipath group to a multipath signal, and independently adjust a time delay value of each demodulation element in the multipath group to correspond to a local time delay of the multipath signal at the corresponding receive antenna.

US Patent:

8139542, Mar 20, 2012

Filed:

Sep 26, 2008

Appl. No.:

12/239027

Inventors:

Brian Dong - Tucson AZ, US
Messay Amerga - San Diego CA, US
Supratik Bhattacharjee - San Diego CA, US
Xiaoming Zhu - Sunnyvale CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04W 4/00

US Classification:

370332, 370242, 455436

Abstract:

Cell timing is detected by first trying to detect a target handover cell through detecting a primary synchronization channel (P-SCH) followed by a common pilot channel (CPICH). If that fails, N number of retrials is performed using a full-window search on the CPICH. The full-window CPICH search is performed blindly, without any slot timing information from the P-SCH. Performance is improved while maintaining the benefits of faster acquisition methods in good channel conditions. The full-window search is more time consuming, but takes advantage of the stronger CPICH transmission. In good channel conditions, a mobile device can proceed quickly with the normal method of timing acquisition. With failure, the mobile device can switch to the longer search which has a higher probability of successfully completing the hard handover procedure. The overall effect is a higher success rate of hard handovers without a uniform increase of time spent in cell timing acquisition.

US Patent:

20070098051, May 3, 2007

Filed:

Mar 28, 2006

Appl. No.:

11/392316

Inventors:

Thejaswi Bharadwaj Shesha - Santa Clara CA, US
Brian Dong - San Diego CA, US
Messay Amerga - San Diego CA, US
Chih-Ping Hsu - San Diego CA, US
Xiaoming Zhu - San Jose CA, US

International Classification:

H04B 1/00

US Classification:

375148000

Abstract:

A rake receiver finger assignor is configured to assign a rake receiver finger to a time offset between identified signal path time offsets in accordance with a concentration of identified signal paths from a transmitter to a rake receiver. In accordance with the exemplary embodiment, a number of identified signal paths having time offsets within a time window are observed to determine the concentration of signal paths identified by a path searcher. If the number of identified signal paths indicates a concentrated distribution of signal paths such as during a fat path condition, at least one rake finger is assigned between at a time offset between two identified signal paths.