Fuyun M Ling

US Patent:

6353900, Mar 5, 2002

Filed:

Oct 13, 1998

Appl. No.:

09/172069

Inventors:

Jeremy Stein - Tel-Aviv, IL
Rajiv Vijayan - San Diego CA
Fuyun Ling - San Diego CA

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H03M 1327

US Classification:

714701, 714702

Abstract:

The present invention is a novel and improved technique for performing coding with particular application to turbo, or iterative, coding techniques. In accordance with one embodiment of the invention, interleaving is performed by generating the address of a memory using a PN state generator. Data is written into a memory in sequential order, and then read out using addresses specified by the PN state generator. To deinterleave, the interleaved data is written into a memory using addresses specified by the PN state generator, and then read out in sequential order. A set of PN state generators that provide excellent coding performance is provided.

US Patent:

6363102, Mar 26, 2002

Filed:

Apr 23, 1999

Appl. No.:

09/298252

Inventors:

Fuyun Ling - San Diego CA
Peter J. Black - La Jolla CA
Kenneth D. Easton - San Diego CA

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H03B 169

US Classification:

375147, 375150, 375152

Abstract:

Coherent detection of high-speed digital wireless communications becomes more difficult when the frequencies of the transmitter and receiver oscillators do not coincide. A frequency-locked loop may be used to characterize this frequency offset by processing the samples received on a pilot channel. Rather than using the offset information thus derived to correct the frequency of the received signal, the invention realizes a considerable computational savings by applying a frequency correction to the despread pilot samples instead.

US Patent:

6373823, Apr 16, 2002

Filed:

Jan 28, 1999

Appl. No.:

09/239454

Inventors:

Tao Chen - San Diego CA
Jack M. Holtzman - San Diego CA
Keith Saints - San Diego CA
Fuyun Ling - San Diego CA

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H04J 314

US Classification:

370252, 455 69, 455522

Abstract:

A power control system for controlling the transmission power in a system wherein the transmission power may be gated or capped. The receiver employs a combination of closed loop and outer loop power control. The outer loop is frozen upon detection by the receiver that the signal has been capped or gated.

US Patent:

6377607, Apr 23, 2002

Filed:

May 13, 1999

Appl. No.:

09/311793

Inventors:

Fuyun Ling - San Diego CA
Eduardo A. S. Esteves - Del Mar CA

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H04B 169

US Classification:

375130, 375148, 375341, 375346, 375349

Abstract:

An efficient telecommunications receiver system for accurately decoding a received composite signal having a data signal component and a pilot signal component. The receiver system includes a first circuit for receiving the composite signal and extracting a pilot signal and a data signal from received composite signal. A second circuit calculates a log-likelihood ratio as a function of a channel estimate based on the pilot signal. A third circuit scales the log-likelihood ratio by a predetermined log-likelihood ratio scaling factor and provides an accurate log-likelihood value in response thereto. A fourth circuit decodes the received composite signal based on the accurate log-likelihood value and the data signal. In a specific embodiment, the pilot signal and the data signal comprise pilot samples and data samples, respectively. The third circuit includes a carrier signal-to-interference ratio circuit for computing a first signal-to-interference ratio and a second signal-to-interference ratio based partly on the pilot signal.

US Patent:

6414988, Jul 2, 2002

Filed:

May 12, 1999

Appl. No.:

09/310232

Inventors:

Fuyun Ling - San Diego CA

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H04B 1707

US Classification:

375150, 375147, 370209

Abstract:

Apparatus for a transmitter and a receiver which enhance the performance of a system coherent demodulation by utilizing non-pilot sub-channels to enhance the accuracy of estimates of amplitude and phase noise inherent in the transmission channel is described. This enhancement is accomplished by utilizing the corrected received data on a fundamental channel to enhance a pilot channel estimate, which is subsequently utilized by a dot product module in demodulating a supplementary data channel.

US Patent:

6466558, Oct 15, 2002

Filed:

Oct 8, 1999

Appl. No.:

09/414125

Inventors:

Fuyun Ling - San Diego CA

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H04Q 700

US Classification:

370334, 370335, 455137

Abstract:

An optimum combiner that reduces the amount of interference imposed upon a first base station by transmissions of other base stations within the same communication system. Two antennas are used to receive transmissions within a receiving station. A rake receiver is coupled to each antenna. By optimally combining the signals that are received by each independent finger of the rake receiver, interference that is correlated between a finger associated with the first antenna and a finger associated with the second antenna can be minimized with respect to the desired signal. Optimum combining requires determination of optimum combining coefficients. A max-ratio combining algorithm may be substituted for the optimal combining algorithm depending upon interference characteristics.

US Patent:

6498805, Dec 24, 2002

Filed:

Nov 3, 1999

Appl. No.:

09/433814

Inventors:

Tyler Brown - Mundelein IL
Michael Mao Wang - Carpentersville IL
Fuyun Ling - San Diego CA

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 169

US Classification:

375147, 375316

Abstract:

An apparatus and method provides channel phase compensation for a digital radio frequency RF channel, by analyzing a demodulated signal ( ) communicated over the digital RF channel and generates data representing an estimate of a channel phase ( ), based on channel symbol reliability data ( ) generated for at least one channel symbol received over the RF channel. The apparatus and method iteratively generates channel symbol reliability data ( ) for a same symbol until a frame containing the symbol is determined to either pass a frame error threshold or until a predetermined number of iterations of channel phase estimates for a symbol is detected.

US Patent:

6522683, Feb 18, 2003

Filed:

Aug 10, 2000

Appl. No.:

09/636008

Inventors:

John E. Smee - San Diego CA
Ahmad Jalali - San Diego CA
Fuyun Ling - San Diego CA
Mark Wallace - Bedford MA

Assignee:

QUALCOMM, Incorporated - San Diego CA

International Classification:

H04B 169

US Classification:

375144, 375145, 375146

Abstract:

A receive filter receives signals from a communication channel. The received signals correspond to original Walsh covered chip sequences transmitted by a transmit filter through the communication channel to the receive filter. The received signals are processed by an equalizer to generate a soft estimate of chip sequences corresponding to the original Walsh covered chip sequences. An N chip Walsh decover is then utilized to generate a soft estimate of code symbols corresponding to the soft estimate of the chip sequences. A number of symbol slicers are then used in parallel to produce a hard estimate of the code symbols corresponding to the soft estimate of code symbols generated by the N chip Walsh decover. Thereafter an N chip Walsh cover is used as part of a scheme to generate a hard estimate of chip sequences corresponding to the hard estimate of the code symbols generated by the symbol slicers. The hard estimate of the chip sequences generated with the aid of the N chip Walsh cover, and the soft estimate of the chip sequences generated by the equalizer, are used to generate a tracking mode error signal to adapt the response of the equalizer to the received signals.