Yifei Zhang, 41Mountain View, CA

7911364, Mar 22, 2011

Sep 3, 2008

12/203691

Yifei Zhang - Sunnyvale CA, US
Kiran Gunnam - San Jose CA, US
Gregory Burd - San Jose CA, US

Marvell International Ltd. - Hamilton

H03M 7/00

341 81, 341 51

A plurality of “local” interleavers replaces a single global interleaver for processing encoded data. If the encoded data may be represented as a matrix of data blocks, or “circulants,” each local interleaver can be the size of one or a small number of circulants. Thus, for example, if the matrix has a certain number of rows and columns, the number of local interleavers may be equal to the number of columns. Each local interleaver is small so latency is low.

8127209, Feb 28, 2012

Jul 25, 2008

12/180229

Yifei Zhang - Sunnyvale CA, US
Hongwei Song - Longmont CO, US
Gregory Burd - San Jose CA, US

Marvell International Ltd. - Hamilton

H03M 13/00

714780, 714785

A QC-LDPC decoding system employing a trapping set look-up table is provided. The QC-LDPC decoding system includes an iterative decoder that utilizes a message-passing algorithm to decode a received codeword. If the iterative decoder fails to produce a valid codeword, additional processing is performed to decode the received codeword. The additional processing includes the steps of computing the syndrome pattern of the received codeword, searching the look-up table for a trapping set class that is responsible for the iterative decoder's failure, retrieving from the look-up table a syndrome pattern and an error pattern of a member of the responsible trapping set class, and calculating the error pattern of the received codeword based on its syndrome pattern and the information retrieved from the look-up table. The received codeword is then corrected based on its error pattern.

8301984, Oct 30, 2012

Feb 15, 2012

13/397479

Yifei Zhang - Sunnyvale CA, US
Hongwei Song - Longmont CO, US
Gregory Burd - San Jose CA, US

Marvell International Ltd. - Hamilton

H03M 13/00

714780, 714785

A QC-LDPC decoding system employing a trapping set look-up table is provided. The QC-LDPC decoding system includes an iterative decoder that utilizes a message-passing algorithm to decode a received codeword. If the iterative decoder fails to produce a valid codeword, additional processing is performed to decode the received codeword. The additional processing includes the steps of computing the syndrome pattern of the received codeword, searching the look-up table for a trapping set class that is responsible for the iterative decoder's failure, retrieving from the look-up table a syndrome pattern and an error pattern of a member of the responsible trapping set class, and calculating the error pattern of the received codeword based on its syndrome pattern and the information retrieved from the look-up table. The received codeword is then corrected based on its error pattern.

8347195, Jan 1, 2013

Jan 19, 2010

12/689611

Nedeljko Varnica - Sunnyvale CA, US
Yifei Zhang - Sunnyvale CA, US
Gregory Burd - San Jose CA, US

Marvell International Ltd. - Hamilton

H03M 13/00

714785, 714752, 714780, 714784, 714799, 714802

Systems and methods are provided for enhancing the performance and throughput of a low-density parity check (LDPC) decoder. In some embodiments, the enhanced performance and throughput may be achieved by detecting and correcting near-codewords before the decoder iterates up to a predetermined number of iterations. In some embodiments, a corrector runs concurrently with the decoder to correct a near-codeword when the near-codeword is detected. In alternate embodiments, the corrector is active while the decoder is not active. Both embodiments allow for on-the-fly codeword error corrections that improve the performance (e. g. , reducing the number of errors) without decreasing the throughput of the decoder.

8601328, Dec 3, 2013

Dec 27, 2012

13/728524

- Hamilton, BM
Yifei Zhang - Milpitas CA, US
Gregory Burd - San Jose CA, US

Marvell International Ltd. - Hamilton

H03M 13/00

714714, 714752, 714780, 714784, 714799, 714802

Systems and methods are provided for enhancing the performance and throughput of a low-density parity check (LDPC) decoder. In some embodiments, the enhanced performance and throughput may be achieved by detecting and correcting near-codewords before the decoder iterates up to a predetermined number of iterations. In some embodiments, a corrector runs concurrently with the decoder to correct a near-codeword when the near-codeword is detected. In alternate embodiments, the corrector is active while the decoder is not active. Both embodiments allow for on-the-fly codeword error corrections that improve the performance (e. g. , reducing the number of errors) without decreasing the throughput of the decoder.

2013017, Jul 4, 2013

Dec 20, 2012

13/723050

MARVELL WORLD TRADE LTD. - St. Michael, BB
Yifei Zhang - Milpitas CA, US
Panu Chaichanavong - Sunnyvale CA, US

MARVELL WORLD TRADE LTD. - St. Michael

G06F 11/10

714763

The present disclosure includes systems and techniques relating to decoding signals produced within a storage device. A described technique includes retrieving a first codeword from a storage medium, decoding the first codeword, performing a retry process when the decoding was not successful, and retrieving one or more second codewords from the storage medium during the retry process to at least maintain a drive throughput. The retry process can include identifying one or more data chunks within the first codeword having potential defects, generating an erasure mask based on the one or more data chunks, applying, based on a window, one or more erasures within one or more different regions of the first codeword based on one or more corresponding regions of the erasure mask to produce one or more versions of the first codeword, and decoding the one or more versions of the first codeword.

2019023, Aug 1, 2019

Jan 31, 2019

16/263071

Jeffrey Chou - Walnut Creek CA, US
Vladimir Liberman - Reading MA, US
Juejun Hu - Newton MA, US
Yifei Zhang - Cambridge MA, US
William Herzog - Bedford MA, US
Jason Stewart - Stow MA, US
Christopher Roberts - Amesbury MI, US

G02B 26/06
G02B 27/09
G02B 5/20
G02B 26/02

Alloys of GeSbSeTe (GSST) can be used to make actively tunable infrared transmission filters that are small, fast, and solid-state. These filters can be used for hyperspectral imaging, 3D LIDAR, portable bio/chem sensing systems, thermal emission control, and tunable filters. GSST is a low-loss phase-change material that can switch from a low-index (n=3), amorphous state to a high-index (n=4.5), hexagonal state with low loss (k

2015034, Dec 3, 2015

May 27, 2014

14/288154

- Menlo Park CA, US
Yifei Zhang - Sunnyvale CA, US
Bin Jiang - San Mateo CA, US

Facebook, Inc. - Menlo Park CA

G06Q 30/02
G06Q 50/00

A social networking system determines a predicted supply of ad impressions over a future period of time for social networking system users based on past viewing information of advertisements presented to the users during a prior time period. Based on the predicted supply of ad impressions, the social networking system manages advertisement campaigns including ad requests received from advertisers. The social networking system determines whether the predicted supply of ad impressions is sufficient to satisfy criteria associated with an advertising campaign and provides feedback to an advertiser associated with the advertising campaign indicating whether the predicted supply of ad impressions contains sufficient unallocated expected ad impression opportunities to satisfy criteria associated with the advertising campaign.