Resumes
Resumes
Xuemei Ouyang Phones & Addresses
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Redwood City, CA
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278 Monroe Dr APT 34, Mountain View, CA 94040
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1907 Baywood Ave, San Jose, CA 95132 (408) 729-7184
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1933 Messina Dr, San Jose, CA 95132 (408) 729-7184
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70 Croton St, Ossining, NY 10562 (914) 941-7376
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Modesto, CA
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Wynnewood, PA
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Bryn Mawr, PA
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Briarcliff Manor, NY
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Santa Clara, CA
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Villanova, PA
Publications
Us Patents
Bit Level Diversity Combining For Cofdm System
View pageUS Patent:
7236548, Jun 26, 2007
Filed:
Jun 28, 2002
Appl. No.:
10/185385
Inventors:
Monisha Ghosh - Chappaqua NY, US
Joseph Patrick Meehan - New York City NY, US
Xuemei Ouyang - Ossining NY, US
Joseph Patrick Meehan - New York City NY, US
Xuemei Ouyang - Ossining NY, US
Assignee:
Koninklijke Philips Electronics N.V. - Eindhoven
International Classification:
H04B 7/10
H04L 1/02
H04L 1/02
US Classification:
375347, 375349, 375267, 375340
Abstract:
Bit level, rather than symbol level, diversity combining is employed within a wireless communications receiver. Channel estimates and bit metrics are separately computed for signals received by different antenna elements. Bit metrics are calculated by determining a least squares cumulative difference between all bits within the received symbol and corresponding bits within constellation symbols as modified by the channel estimate. The separately-determined bit metrics are then combined for decoding. Performance improvements over both single antenna systems and multiple antenna systems with symbol level diversity combining are achieved.
Method Of Designing Interleavers For Multiple-Encoder Mimo Ofdm Systems
View pageUS Patent:
7397862, Jul 8, 2008
Filed:
Oct 18, 2005
Appl. No.:
11/253855
Inventors:
Xuemei Ouyang - San Jose CA, US
Chiu Ngo - San Francisco CA, US
Chiu Ngo - San Francisco CA, US
Assignee:
Samsung Electronics Co., Ltd. - Suwon
International Classification:
H04L 1/02
US Classification:
375267, 370208, 370310, 375316, 375299, 375347, 375260, 375286
Abstract:
An improved interleaver design to fully explore the diversity of the MIMO OFDM systems provides higher diversity gain than usual. A method for wireless data communication using such interleaver design implements parsing a bit stream into multiple spatial data streams, interleaving the bits in each spatial data stream by performing bit circulation to increase diversity of the wireless system, and transmitting the bits of each spatial data stream.
Simplified Decoder For A Bit Interleaved Cofdm-Mimo System
View pageUS Patent:
7411928, Aug 12, 2008
Filed:
Nov 18, 2003
Appl. No.:
10/537221
Inventors:
Monisha Ghosh - Chappaqua NY, US
Xuemei Ouyang - Ossining NY, US
Xuemei Ouyang - Ossining NY, US
Assignee:
Koninklijke Philips Electronics N.V. - Eindhoven
International Classification:
H04Q 7/00
US Classification:
370332, 370343, 375260
Abstract:
Multiple input multiple output (MIMO) systems are candidates for higher data rate wireless communication systems. Currently, for a single input single output (SISO) 1802. 11a system can provide a transmission data rate up to 54 Mbps. The present invention is a 2 by 2 Multiple In Multiple Out (MIMO) system having a decoding apparatus that increases the data rate to over 100 Mbps but at a computation cost about the same as for optimal decoding for a SISO system and 1/64 of the optimal decoding for a 2 by 2 MIMO system. At a bit error rate (BER) of 10-4 level, the 2 by 2 MIMO system of the present invention provides double the transmission data rate of the SISO system with approximately the same signal to noise ratio (SNR).
Interleaver And Parser For Ofdm Mimo Systems
View pageUS Patent:
7613243, Nov 3, 2009
Filed:
Apr 12, 2005
Appl. No.:
11/104808
Inventors:
Xuemei Ouyang - San Jose CA, US
Huaning Niu - Santa Clara CA, US
Chiu Ngo - San Francisco CA, US
Huaning Niu - Santa Clara CA, US
Chiu Ngo - San Francisco CA, US
Assignee:
Samsung Electronics Co., Ltd. - Suwon
International Classification:
H04K 1/10
US Classification:
375260, 375267, 375316, 375286, 370208, 714752, 714790, 341 81
Abstract:
A MIMO wireless system includes a transmitter that has a transmitter having a parser that parses a bit stream into multiple spatial data streams and multiple interleavers corresponding to the multiple spatial data streams, where each interleaver interleaves the bits in the corresponding spatial data stream by performing multiple column rotation to increase diversity of the wireless system. The MIMO wireless system also includes a receiver that has deinterleavers that deinterleaves spatial bit streams transmitted by the transmitter.
Interleaver Design With Column Skip For Ieee 802.11N Standard
View pageUS Patent:
7660232, Feb 9, 2010
Filed:
Dec 20, 2005
Appl. No.:
11/314929
Inventors:
Xuemei Ouyang - San Jose CA, US
Chiu Ngo - San Francisco CA, US
Chiu Ngo - San Francisco CA, US
Assignee:
Samsung Electronics Co., Ltd. - Suwon
International Classification:
H04J 11/00
US Classification:
370208, 375260
Abstract:
A MIMO wireless system includes a transmitter having a parser that parses a bit stream into multiple spatial data streams and multiple interleavers corresponding to the multiple spatial data streams, where each interleaver interleaves the bits in the corresponding spatial data stream by performing column skip operation and frequency rotation, to increase diversity of the wireless system. The MIMO wireless system also includes a receiver that has deinterleavers that deinterleaves spatial bit streams transmitted by the transmitter.
System And Method For Maximum Likelihood Decoding In Multiple Out Wireless Communication Systems
View pageUS Patent:
7724834, May 25, 2010
Filed:
Jun 27, 2005
Appl. No.:
11/571366
Inventors:
Xuemei Ouyang - San Jose CA, US
Pen Li - San Jose CA, US
Monisha Ghosh - Chappaqua NY, US
Pen Li - San Jose CA, US
Monisha Ghosh - Chappaqua NY, US
Assignee:
Koninklijke Philips Electronics N.V. - Eindhoven
International Classification:
H04L 5/12
US Classification:
375262
Abstract:
A system and method for a simplified Maximum Likelihood (ML) decoding () for MIMO systems is provided. The full ML decoding gives the lower bound of the decoding for CC coded MIMO systems. However, the computation cost is too high to be implemented in real system. Many alternative methods have been proposed for the decoding. Among them, weighted Zero Forcing (WZF) is one that can give affordable performance with reasonable computation complexity but there are several dB of performance gap for the WZF decoding and ML decoding. This present invention discloses a decoding system and method having improved performance over WZF decoding with affordable implementation complexity.
Interleaver Design For Ieee 802.11N Standard
View pageUS Patent:
7729438, Jun 1, 2010
Filed:
Dec 1, 2005
Appl. No.:
11/292851
Inventors:
Xuemei Ouyang - San Jose CA, US
Huaning Niu - Santa Clara CA, US
Chiu Ngo - San Francisco CA, US
Huaning Niu - Santa Clara CA, US
Chiu Ngo - San Francisco CA, US
Assignee:
Samsung Electronics Co., Ltd. - Suwon
International Classification:
H04B 7/02
H04L 1/02
H04L 1/02
US Classification:
375267, 455132, 455133, 455134, 455135, 455136
Abstract:
A MIMO wireless system includes a transmitter having a parser that parses a bit stream into multiple spatial data streams and multiple interleavers corresponding to the multiple spatial data streams, where each interleaver interleaves the bits in the corresponding spatial data stream by performing multiple column rotations and row rotation, to increase diversity of the wireless system. The MIMO wireless system also includes a receiver that has deinterleavers that deinterleaves spatial bit streams transmitted by the transmitter.
Interleaver Design With Multiple Encoders For More Than Two Transmit Antennas In High Throughput Wlan Communication Systems
View pageUS Patent:
7729447, Jun 1, 2010
Filed:
Dec 22, 2005
Appl. No.:
11/317409
Inventors:
Jyh Chau Horng - Saratoga CA, US
Xuemei Ouyang - San Jose CA, US
Chiu Ngo - San Francisco CA, US
Xuemei Ouyang - San Jose CA, US
Chiu Ngo - San Francisco CA, US
Assignee:
Samsung Electronics Co., Ltd. - Suwon
International Classification:
H04L 27/00
US Classification:
375299, 375260, 375267, 375347, 375286, 714752, 714755, 370328, 370208
Abstract:
A MIMO communication system implements an interleaver design with multiple encoders for more than two transmit antennas for high throughput WLAN communication systems. Multiple encoders are utilized in the transmitter and multiple decoders are utilized in the receiver, wherein each encoder operates at lower clock speed than would be necessary with a single encoder. In conjunction with using multiple encoders, a modified interleaving function for each spatial stream processing allows fully exploring the diversity gains. The provided interleaving function is suitable for transmitter architectures with multiple encoders. Similarly, a modified de-interleaving function is provided that is suitable for receiver architectures with multiple decoders.