Feng Susan S Chen

US Patent:

RE40661, Mar 10, 2009

Filed:

Sep 21, 2001

Appl. No.:

09/996086

Inventors:

Dong-seek Park - Suwon-si, KR
John Villasenor - Santa Monica CA, US
Feng Chen - Irvine CA, US
Max Luttrell - Venice CA, US
Brendan Dowling - Malibu CA, US

Assignee:

Samsung Electronics Co., Ltd. - Suwon-si
Regents of the University of California - Oakland CA

International Classification:

G06F 11/00

US Classification:

714825, 714775, 714746, 714748, 714751, 375364, 375368

Abstract:

An error protection method for multimedia improves data recovery and channel throughput in channels which cause a random error and a burst error by using a rate compatible punctured convolutional code (RCPC) and an automatic retransmission on request (ARQ). In a process of decoding a plurality of packets of given information, the error protection method includes the steps of a) decoding one of the plurality of packets, b) decoding another packet when an error occurs during the decoding in step a), c) decoding a combination of the packets from steps a) and b) or a third packet when an error occurs in step b), and d) repeating step c) until the decoding error no longer occurs. The error protection method has the characteristics of both Type-1 and Type-2 ARQ methods. Therefore, one can obtain constant channel throughput in a channel containing burst errors, a channel containing random errors, and a channel in which the two types of error patterns coexist simultaneously.

US Patent:

D634248, Mar 15, 2011

Filed:

Feb 12, 2010

Appl. No.:

29/355777

Inventors:

Feng Li Chen - Alhambra CA, US

International Classification:

1216

US Classification:

D12177

US Patent:

20130294377, Nov 7, 2013

Filed:

Jul 2, 2013

Appl. No.:

13/933510

Inventors:

Jonathan S. Min - Fullerton CA, US
Lisa V. Denney - Suwanee GA, US
Henry Samueli - Corona del Mar CA, US
Sean F. Nazareth - Irvine CA, US
Feng Chen - Irvine CA, US
Fang Lu - Rowland Heights CA, US
Christopher R. Jones - Newport Beach CA, US

International Classification:

H04W 72/08

US Classification:

370329

Abstract:

A number of features for enhancing the performance of a communication system, in which data is transmitted between a base station and a plurality of subscriber stations located different distances from the base station, are presented. The power transmission level, slot timing, and equalization of the subscriber stations are set by a ranging process. Data is transmitted by the subscriber stations in fragmented form. Various measures are taken to make transmission from the subscriber stations robust. The uplink data transmission is controlled to permit multiple access from the subscriber stations.

US Patent:

59548398, Sep 21, 1999

Filed:

Jan 14, 1997

Appl. No.:

8/782174

Inventors:

Dong-seek Park - Daegu, KR
John Villasenor - Santa Monica CA
Feng Chen - Irvine CA
Max Luttrell - Santa Monica CA
Brendan Dowling - Malibu CA

Assignee:

Samsung Electronics Co., Ltd. - Kyungki-do
The Regents of the University of California - Oakland CA

International Classification:

G06F 1100

US Classification:

714825

Abstract:

An error protection method for multimedia improves data recovery and channel throughput in channels which cause a random error and a burst error by using a rate compatible punctured convolutional code (RCPC) and an automatic retransmission on request (ARQ). In a process of decoding a plurality of packets of given information, the error protection method includes the steps of a) decoding one of the plurality of packets, b) decoding another packet when an error occurs during the decoding in step a), c) decoding a combination of the packets from steps a) and b) or a third packet when an error occurs in step b), and d) repeating step c) until the decoding error no longer occurs. The error protection method has the characteristics of both Type-1 and Type-2 ARQ methods. Therefore, one can obtain constant channel throughput in a channel containing burst errors, a channel containing random errors, and a channel in which the two types of error patterns coexist simultaneously.

US Patent:

58259309, Oct 20, 1998

Filed:

Mar 5, 1997

Appl. No.:

8/811189

Inventors:

Dong-seek Park - Daegu, KR
John Villasenor - Los Angeles CA
Feng Chen - Los Angeles CA

Assignee:

Samsung Electronics Co., Ltd. - Kyungki-Do
The Regents of the University of California - Oakland CA

International Classification:

G06K 936

US Classification:

382236

Abstract:

A motion estimating method for determining a motion vector, using a bit rate-distortion technique in image compression. The motion estimating method includes the steps of obtaining a motion vector (x. sub. o, y. sub. o) which minimizes a predetermined error function, assuming a preferred motion vector (x, y), calculating the difference (x-diff, y-diff) between (x. sub. o, y. sub. o) and (x, y), obtaining the number of bits needed to encode the x-diff and y-diff, determining a bias based on a bias model according to the bit number, obtaining a final cost function value based on the difference between a cost function value and a bias, comparing the final cost function value with a predetermined allowance limit, determining the assumed motion vector (x, y) as a motion vector for a current macroblock and updating the allowance limit by using the cost function value, if the cost function value is smaller than the predetermined allowance limit and discarding the assumed motion vector (x, y) if the cost function value is not smaller than the predetermined allowance limit. The disclosed method is successful in increasing the compression rate.

US Patent:

58188770, Oct 6, 1998

Filed:

Mar 26, 1996

Appl. No.:

8/622659

Inventors:

John D. Villasenor - Santa Monica CA
Feng Chen - Irvine CA

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

H04M 746

US Classification:

375241

Abstract:

A method generates a reduced number of values representing a sequence of grouped data values and partitions the reduced number of values by first mapping data values into groups of symbols and then partitioning the resulting stream of symbols. The digits representing the first data value in each group are replaced with symbols from a first alphabet. The most significant digit of the second data value in each group and the sign of that second data value are also represented by a symbol from the first symbol set, while the remaining significant bits of the second data value in each group are represented by symbols from a second symbol set. A stream of symbols which represent a sequence of grouped data values is partitioned into first partition symbol groups and second partition symbol groups. Each first partition symbol group comprises the symbols representing the first data value in each group and also the symbol representing the least significant bit of the second data value which follows. Each second partition symbol group comprises the symbols representing all digits of a second data value excluding the symbol which represented the least significant digits.