Feng Lian Lu

US Patent:

8175100, May 8, 2012

Filed:

Oct 15, 2008

Appl. No.:

12/252192

Inventors:

Anil Kumar Goteti - San Jose CA, US
Amit Butala - Sunnyvale CA, US
Feng Lu - Sunnyvale CA, US
Harish Venkatachari - Campbell CA, US

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H04L 12/28

US Classification:

3703954, 370336, 370345, 370458, 370498

Abstract:

A wireless user equipment device transmits a control channel and a data channel. Each of the control channel and the data channel include a plurality of time slots. The control channel is configured to transmit control information and includes both transmission time slots and non-transmission time slots. The data channel is configured to transmit data packets. The device further includes a processor configured to schedule at least one data packet for transmission in at least one data channel time slot that is concurrent to at least one control channel transmission time slot, and a transmission module configured to transmit the at least one data packet in the at least one data channel time slot that is concurrent to the at least one control channel transmission time slot.

US Patent:

8477888, Jul 2, 2013

Filed:

Jun 24, 2008

Appl. No.:

12/145322

Inventors:

Feng Lu - Sunnyvale CA, US
Prashant Udupa Sripathi - San Jose CA, US
Liang Zhao - Campbell CA, US
Subramanya P. Rao - Santa Clara CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H03D 1/04

US Classification:

375346, 375316

Abstract:

System(s) and method(s) are provided for generating phase-noise resilient channel quality indicator(s). A pilot signal utilized to determine a channel quality indicator is rotated to be aligned to a phase reference signal. Separate noise evaluations in quadrature and in-phase directions are utilized, at least in part, to generate a net noise estimate that is phase-noise compensated or resilient. For example, various combination schemes of quadrature and in-phase noise evaluations can be exploited to generate a net noise estimate, the schemes include weighted average of in-phase and quadrature noise estimates and running averages thereof. Simulation of net noise estimates as a function of geometry conditions reveal that the combination schemes provide substantive mitigation of phase-noise, thus making CQI generation phase-noise resilient.

US Patent:

8554151, Oct 8, 2013

Filed:

Dec 3, 2010

Appl. No.:

12/960283

Inventors:

Young Geun Cho - Palo Alto CA, US
Aditya Dua - Santa Clara CA, US
Feng Lu - Sunnyvale CA, US
Gokhan Mergen - Sunset Valley TX, US
Abhinav Gupta - San Jose CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04B 17/00

US Classification:

455 6713, 455 6711, 455 68, 455 69, 4552261, 4552263, 455450, 4554521, 4554522, 370329, 370332, 370333

Abstract:

Methods and apparatuses for data aided channel quality estimation using both pilot and data information are disclosed herein. In one exemplary aspect, a method for estimating channel quality in a wireless communication system is disclosed. The method comprises estimating a pilot noise variance based on a pilot signal received from a base station on a downlink and estimating a data noise variance based on a data signal received from the base station on the downlink. The method also comprises combining the pilot noise variance and the data noise variance to obtain a combined noise variance, and estimating the channel quality based on the combined noise variance.

US Patent:

8578250, Nov 5, 2013

Filed:

Sep 8, 2011

Appl. No.:

13/227906

Inventors:

Prashant Udupa Sripathi - Santa Clara CA, US
Jittra Jootar - Santa Clara CA, US
Je Woo Kim - Santa Clara CA, US
Feng Lu - Santa Clara CA, US

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H03M 13/00
H03M 13/03

US Classification:

714780, 714795

Abstract:

A method of data classification for use in a wireless communication system includes obtaining decoder metrics from a decoder. The decoder metrics correspond to data generated by the decoder. The decoder metrics include a first metric and a second metric. The method also includes classifying the data into a first category if the data fails an error detection check, into a second category if the data passes the error detection check and is determined to be unreliable, or into a third category if the data passes the error detection check and is determined to be reliable. A reliability of the data is determined based on at least one of the decoder metrics and a threshold.

US Patent:

8612825, Dec 17, 2013

Filed:

Sep 8, 2011

Appl. No.:

13/227884

Inventors:

Prashant Udupa Sripathi - Santa Clara CA, US
Jittra Jootar - Santa Clara CA, US
Je Woo Kim - Santa Clara CA, US
Feng Lu - Santa Clara CA, US

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H03M 13/00
H03M 13/03

US Classification:

714758, 714795, 714704, 714780

Abstract:

A method of data classification for use in a wireless communication system includes obtaining decoder metrics from a decoder. The decoder metrics correspond to data generated by the decoder. The decoder metrics include a symbol error rate (SER) and an energy metric (EM). The method also includes classifying the data into a first category if the data fails a cyclic redundancy check (CRC) check, into a second category if the data passes the CRC check and is determined to be unreliable, or into a third category if the data passes the CRC check and is determined to be reliable. A reliability of the data is determined based on the decoder metrics and an EM threshold.

US Patent:

20100135172, Jun 3, 2010

Filed:

Sep 4, 2009

Appl. No.:

12/554202

Inventors:

Tao Cui - Santa Clara CA, US
Feng Lu - Sunnyvale CA, US
Anil Kumar Goteti - Evanston IL, US
Vignesh Sethuraman - Milpitas CA, US
Subramanya P. Rao - Santa Clara CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04L 12/26

US Classification:

370252

Abstract:

Various embodiments are disclosed which predict the channel quality indicator (CQI) in High Speed Downlink Packet Access (HSDPA). The accuracy of CQI is crucial for HSDPA performance. In some HSDPA systems the CQI may be as much as three (3) subframes stale. Accordingly, the prediction of CQI values is required in order to efficiently schedule data for transmission over the communication channel. Various embodiments disclose first order adaptive IIR filters which are significantly less complex than the finite impulse response (FIR) counterparts and achieve similar accuracy. By minimizing the mean squared error (MSE), an exact gradient descent algorithm may be used as well as two embodiment pseudolinear regression algorithms.

US Patent:

20110026430, Feb 3, 2011

Filed:

Jul 30, 2009

Appl. No.:

12/512224

Inventors:

Youngjae Kim - Santa Clara CA, US
Feng Lu - Santa Clara CA, US
Anil Kumar Goteti - Evanston IL, US
Jonathan Sidi - Santa Clara CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04B 17/00
H04L 12/26

US Classification:

370253, 455 677, 375228

Abstract:

A method for detecting a channel condition for a wireless communication device is provided. The method includes measuring a plurality of power levels as received by the wireless communication device; determining a metric based on the plurality of power level measurements; and generating a high-speed fading indication signal based on the metric. An apparatus for performing the method is also disclosed herein.

US Patent:

20120120860, May 17, 2012

Filed:

Oct 27, 2011

Appl. No.:

13/282648

Inventors:

Jimmy C. Chui - Mountain View CA, US
Ravi Gopalan - San Diego CA, US
Feng Lu - Sunnyvale CA, US
Guang Xie - San Jose CA, US

International Classification:

H04W 52/04
H04W 72/04

US Classification:

370311, 370329

Abstract:

In a cellular communication system, apparatus and methods relating to a power-optimized demodulator front end (demfront) receiver subsystem of a user equipment (UE) can reduce power utilization by optimizing the operation of the demfront receiver subsystem. For example, in an aspect, the apparatus and methods include enabling a first receiver of a device for receiving a control channel on a downlink from a node, determining that the control channel schedules the device to receive data on the downlink, enabling a second receiver of the device that consumes more power than the first receiver to receive the data on the downlink, and re-enabling the first receiver for receiving the control channel on the downlink subsequent to receiving the data.