Thomas W Sun

US Patent:

7660368, Feb 9, 2010

Filed:

Jan 11, 2006

Appl. No.:

11/330652

Inventors:

Fuyun Ling - San Diego CA, US
Seong Taek Chung - Redwood City CA, US
Jinxia Bai - San Diego CA, US
Thomas Sun - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H03D 3/22

US Classification:

375332, 341143, 370207, 375262, 375265, 375341

Abstract:

A system and method are provided for generating bit log likelihood ratio (LLR) values for two-layered Quadrature Phase-Shift Keying (QPSK) turbo decoding in a wireless communications user terminal (UT). The method includes receiving a two-layered QPSK signal with an energy ratio that is unknown, but typically defined as either kor k. The method selects a mismatched energy ratio (k) between kand k, and generating bit LLR values for two-layered QPSK turbo decoding, using the mismatched kenergy ratio. For example, if the received two-layered QPSK signal is known to have an energy ratio of about 4 or about 6. 25. Then, kis selected to be about 5. 0625. Alternately stated, the mismatched kenergy ratio in selected by determining the approximate midpoint between kand k.

US Patent:

7693231, Apr 6, 2010

Filed:

Jun 14, 2006

Appl. No.:

11/453439

Inventors:

Fuyun Ling - San Diego CA, US
Thomas Sun - San Diego CA, US
Durk L. van Veen - Santee CA, US
Murali Ramaswamy Chari - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04L 27/00

US Classification:

375295, 375285

Abstract:

The claimed subject matter relates to estimating noise variance associated with a transmitter. For example, the noise variance can be estimated in connection with determining performance parameters associated with a transmitter. Determining noise variance can include the acts of estimating phase alteration of a received signal through utilization of a least squares-based phase estimation algorithm. Determining noise variance can also include the act of determining an unbiased estimation of noise variance as a function of the estimated phase alteration.

US Patent:

7733968, Jun 8, 2010

Filed:

Feb 22, 2006

Appl. No.:

11/361085

Inventors:

Fuyun Ling - San Diego CA, US
Durk L. Van Veen - Santee CA, US
Murali Ramaswamy Chari - San Diego CA, US
Thomas Sun - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04L 27/28

US Classification:

375260

Abstract:

Systems and methodologies are described that facilitate monitoring transmitter performance in a wireless communication environment. A signal analyzer can be used to sample the output of a transmitter and the sampled signal can be propagated to a processor. The processor can generate frequency domain channel estimates for the subcarriers. If the transmitted modulation symbols are unknown, the processor can determine the modulation symbols and use the determined modulation symbols to calculate the channel estimates. The channel estimates can be averaged and used to generate various metrics to evaluate the transmitter performance.

US Patent:

7734303, Jun 8, 2010

Filed:

May 30, 2006

Appl. No.:

11/444204

Inventors:

Raghuraman Krishnamoorthi - San Diego CA, US
Thomas Sun - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04Q 7/20

US Classification:

455501, 455500, 455 91, 455103, 455 6711, 455104, 370335, 370337, 370347, 370341

Abstract:

Systems and methodologies are described that facilitate monitoring transmitter performance in a wireless communication environment. A metric or metrics associated with one or more pilot symbols can be generated and used to evaluate performance. To generate pilot metrics, a signal analyzer can be used to sample the output of a transmitter and the sampled signal can be propagated to a processor. The processor can generate frequency domain channel estimates for subcarriers. Average channel estimates for the subcarriers can be used with the known pilot symbols to determine noise or error for each subcarrier, which can be used to generate the noise variance for each of the pilot symbols. A pilot modulation error metric can be generated based upon the average channel estimates and noise variance.

US Patent:

7830957, Nov 9, 2010

Filed:

May 2, 2006

Appl. No.:

11/416853

Inventors:

Jinxia Bai - San Diego CA, US
Thomas Sun - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04B 1/66

US Classification:

375240, 375278, 375285, 375296, 714756, 341 81

Abstract:

Systems and methods are provided to process wireless data packets. A method includes determining a subset of data bits to be processed at a wireless transmitter and employing a clock edge to store the data. The clock edge allows parallel mapping of at least two bits from the subset of data bits into an interleaver memory per a given clock edge. From the memory, other encoding and scrambling processes are applied before transmitting the data packets across a wireless network.

US Patent:

8102949, Jan 24, 2012

Filed:

Dec 23, 2009

Appl. No.:

12/646543

Inventors:

Fuyun Ling - San Diego CA, US
Seong Taek Chung - San Diego CA, US
Jinxia Bai - San Diego CA, US
Thomas Sun - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H03D 3/22

US Classification:

375332, 341143, 370207, 375262, 375265, 375341

Abstract:

A system and method are provided for generating bit log likelihood ratio (LLR) values for two-layered Quadrature Phase-Shift Keying (QPSK) turbo decoding in a wireless communications user terminal (UT). The method includes receiving a two-layered QPSK signal with an energy ratio that is unknown, but typically defined as either kor k. The method selects a mismatched energy ratio (k) between kand k, and generating bit LLR values for two-layered QPSK turbo decoding, using the mismatched kenergy ratio. For example, if the received two-layered QPSK signal is known to have an energy ratio of about 4 or about 6. 25. Then, kis selected to be about 5. 0625. Alternately stated, the mismatched kenergy ratio in selected by determining the approximate midpoint between kand k.

US Patent:

8139612, Mar 20, 2012

Filed:

Apr 4, 2006

Appl. No.:

11/398156

Inventors:

Jinxia Bai - San Diego CA, US
Chinnappa K. Ganapathy - San Diego CA, US
Thomas Sun - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04J 13/00
H04J 9/00
H04J 11/00
H04J 1/00

US Classification:

370479, 370204, 370206, 370484

Abstract:

Methods and apparatus for dynamic packet mapping. A method is provided for mapping metric data to produce a decodable packet associated with a channel. The method includes obtaining a channel identifier associated with metric data, determining an available buffer from a plurality of buffers based on the channel identifier, writing the metric data to the available buffer, detecting when a decodable packet is formed in a selected buffer of the plurality of buffers, and outputting the decodable packet from the selected buffer. An apparatus includes a plurality of buffers and mapping logic that is configured to obtain a channel identifier associated with metric data, determine an available buffer based on the channel identifier, write the metric data to the available buffer, detect when a decodable packet is formed in a selected buffer, and output the decodable packet from the selected buffer.

US Patent:

8213548, Jul 3, 2012

Filed:

Apr 4, 2006

Appl. No.:

11/398205

Inventors:

Jinxia Bai - San Diego CA, US
Chinnappa K. Ganapathy - San Diego CA, US
Thomas Sun - San Diego CA, US

Assignee:

Qualcomm Incorporated - San Diego CA

International Classification:

H04L 27/28
H04L 27/00
H04L 27/06
H04K 1/10

US Classification:

375340, 375260, 375316

Abstract:

Methods and apparatus for dynamic packet reordering. In an aspect, a method is provided for processing slot data on-the-fly to produce decodable packets, wherein the slot data includes interleaved modulation symbols. The method includes de-interleaving a stream of the interleaved modulation symbols to produce a stream of modulation symbols, calculating parallel streams of LLR metrics based on the stream of modulation symbols, and mapping the parallel streams of LLR metrics to produce a stream of decodable packets. In another aspect, an apparatus is provided the includes de-interleaving logic to de-interleave a stream of interleaved modulation symbols to produce a stream of modulation symbols, metric processing logic configured to produce parallel streams of LLR metrics based on the stream of modulation symbols, and mapping logic configured to map the parallel streams of LLR metrics to produce a stream of decodable packets.