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Yi-Hsiu H Wang

from Palo Alto, CA
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Related to:
Yumei W Hu, 73Chilie Wang, 71Chenwei Lai, 65Calvin T Wang, 27Catherine T WangYa Yu, 68Jiun Ru Wang, 55
Connected to:
Adrianne J Wang, 33Agnes L Wang, 66Aichen Wang, 35Alessandra L Wang, 40An J Wang, 74Anne N Wang, 51Anran Wang, 39Ao G Wang, 63Audris Wang, 41Avery L Wang, 59

Yi-Hsiu Wang Phones & Addresses

  • 644 Barron Ave, Palo Alto, CA 94306 (650) 575-1781

Languages

English

Industries

Wireless

Resumes

Resumes

Yi-Hsiu Wang Photo 1

Yi-Hsiu Wang

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Location:
644 Barron Ave, Palo Alto, CA 94306
Industry:
Wireless
Languages:
English

Publications

Us Patents

Positioning With Wireless Local Area Networks And Wlan-Aided Global Positioning Systems

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US Patent:
7130646, Oct 31, 2006
Filed:
Feb 14, 2003
Appl. No.:
10/367524
Inventors:
Yi-Hsiu Wang - Palo Alto CA, US
Assignee:
Atheros Communications, Inc. - Santa Clara CA
International Classification:
H04Q 7/20
US Classification:
4554565, 4554562, 4554561, 4554042
Abstract:
Accurate position capability can be quickly provided using a Wireless Local Area Network (WLAN). When associated with a WLAN, a wireless device can quickly determine its relative and/or coordinate position based on information provided by an access point in the WLAN. Before a wireless device disassociates with the access point, the WLAN can periodically provide time, location, and decoded GPS data to the wireless device. In this manner, the wireless device can significantly reduce the time to acquire the necessary GPS satellite data (i. e. on the order of seconds instead of minutes) to determine its coordinate position.

Decoding System And Method For Digital Communications

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US Patent:
7173972, Feb 6, 2007
Filed:
Mar 23, 2001
Appl. No.:
09/816810
Inventors:
John S. Thomson - Santa Clara CA, US
Paul J. Hustad - El Cerrito CA, US
Ardavan M. Tehrani - Menlo Park CA, US
Jeffrey M. Gilbert - Sunnyvale CA, US
William J. McFarland - Los Altos CA, US
Lars E. Thon - San Jose CA, US
Yi-Hsiu Wang - Palo Alto CA, US
International Classification:
H04K 1/10
H04L 27/28
US Classification:
375260, 375262, 375265, 375341, 714792, 714794, 714795
Abstract:
A Viterbi decoding system interprets bits in received QAM constellations as many-valued parameters rather than binary valued parameters. It performs the Viterbi algorithm using these many-valued parameters to provide results superior to hard decision decoding. Rather than applying a hard 0-1 function to the QAM data, the system uses a non-stepped linear or curved transfer function to assign values to the bits. In another aspect, a system differentiates between data bits based on their estimated reliability, giving more emphasis to decoding reliable bits than unreliable bits using any of a variety of techniques. By differentiating between god and bad bits and de-emphasizing or ignoring unreliable bits, the system can provide a significant reduction in uncorrectable errors and packet loss.

Look Up Table Based Upsampling And Digital Filtering

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US Patent:
7185036, Feb 27, 2007
Filed:
May 3, 2002
Appl. No.:
10/139654
Inventors:
Yi-Hsiu Wang - Union City CA, US
John Thomson - Union City CA, US
Assignee:
Atheros Communications, Inc. - Santa Clara CA
International Classification:
G06F 7/38
US Classification:
708290
Abstract:
A system and method are disclosed for processing a signal that includes receiving encoded data including a plurality of input symbols; generating an input symbol set from the plurality of input symbols; looking up a plurality of output samples for the input symbol set; and outputting the plurality of output samples.

Method And System To Implement Non-Linear Filtering And Crossover Detection For Pilot Carrier Signal Phase Tracking

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US Patent:
7203255, Apr 10, 2007
Filed:
Feb 15, 2002
Appl. No.:
10/076854
Inventors:
Yi-Hsiu Wang - Palo Alto CA, US
Teresa H. Meng - Portola Valley CA, US
Assignee:
Atheros Communications, Inc. - Santa Clara CA
International Classification:
H04L 27/06
US Classification:
375340, 370491
Abstract:
Systems and methods for correcting phase ambiguity in a total pilot phase value are presented. Examples include comparing and correcting total pilot phase values having different pilot frequencies within the same sampling interval, such as the same data symbol. Another example includes correcting a total pilot phase value for one sampling interval and corresponding to one pilot frequency using nonlinear filtering of values of the total pilot phase for prior sampling intervals at the same pilot frequency.

Spur Mitigation Techniques

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US Patent:
7321631, Jan 22, 2008
Filed:
Jul 31, 2006
Appl. No.:
11/461347
Inventors:
Won-Joon Choi - Santa Clara CA, US
Jeffrey M. Gilbert - Santa Clara CA, US
Yi-Hsiu Wang - Santa Clara CA, US
Xiaoru Zhang - Santa Clara CA, US
Assignee:
Atheros Communications, Inc. - Santa Clara CA
International Classification:
H03D 1/00
H04K 1/10
US Classification:
375260, 375341, 375346
Abstract:
Spurs cause significant problems with signal detecting, amplifier gain adjustment, and signal decoding. Various techniques can be used to mitigate the effects of spurs on a received signal. Generally, these techniques work by either canceling or ignoring the spurs. For example, a pilot mask can be used to ignore pilot information in one or more sub-channels. A Viterbi mask can determine the weighting given to bits in a sub-channel based on spur and data rate information. Channel interpolation can compute a pseudo channel estimate for a sub-channel known to have a spur location can be computed by interpolating the channel estimates of adjacent good sub-channels. Filtering of the received signal using a low-pass filter, a growing box filter, or a low-pass filter with self-correlation can be used to cancel a spur.

Wireless Channel Estimation

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US Patent:
7623467, Nov 24, 2009
Filed:
Sep 17, 2003
Appl. No.:
10/666953
Inventors:
Qinfang Sun - Cupertino CA, US
Won-Joon Choi - Sunnyvale CA, US
Jeffrey M. Gilbert - Sunnyvale CA, US
Yi-Hsiu Wang - Palo Alto CA, US
Assignee:
Atheros Communications, Inc. - Santa Clara CA
International Classification:
H04L 12/28
US Classification:
370252, 370310, 370431, 370492, 375147
Abstract:
A system and method are disclosed for wireless channel estimation. Estimating the characteristics of a wireless channel includes receiving a plurality of training symbols sent for the purpose of facilitating channel estimation; calculating a phase difference between at least two of the training symbols; using the calculated phase difference to coherently combine the training symbols to produce a composite training symbol; and using the composite training symbol to estimate the channel.

Decoding System And Method For Digital Communications

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US Patent:
7636400, Dec 22, 2009
Filed:
Jan 10, 2007
Appl. No.:
11/621940
Inventors:
John S. Thomson - Santa Clara CA, US
Paul J. Husted - Santa Clara CA, US
Ardavan Maleki Tehrani - Santa Clara CA, US
Jeffrey M. Gilbert - Santa Clara CA, US
William J. McFarland - Santa Clara CA, US
Lars E. Thon - Santa Clara CA, US
Yi-Hsiu Wang - Santa Clara CA, US
Assignee:
Atheros Communications, Inc. - Santa Clara CA
International Classification:
H04K 1/10
H04L 27/28
US Classification:
375260, 375340, 375346, 714792, 714794, 714795
Abstract:
A Viterbi decoding system interprets bits in received QAM constellations as many-valued parameters rather than binary valued parameters. It performs the Viterbi algorithm using these many-valued parameters to provide results superior to hard decision decoding. Rather than applying a hard 0-1 function to the QAM data, the system uses a non-stepped linear or curved transfer function to assign values to the bits. In another aspect, a system differentiates between data bits based on their estimated reliability, giving more emphasis to decoding reliable bits than unreliable bits using any of a variety of techniques. By differentiating between god and bad bits and de-emphasizing or ignoring unreliable bits, the system can provide a significant reduction in uncorrectable errors and packet loss.

Apparatus And Method Of Multiple Antenna Receiver Combining Of High Data Rate Wideband Packetized Wireless Communication Signals

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US Patent:
7672220, Mar 2, 2010
Filed:
Mar 6, 2008
Appl. No.:
12/043694
Inventors:
Ardavan Maleki Tehrani - Santa Clara CA, US
Won-Joon Choi - Santa Clara CA, US
Jeffrey M. Gilbert - Santa Clara CA, US
Yi-Hsiu Wang - Santa Clara CA, US
Assignee:
Atheros Communications, Inc. - Santa Clara CA
International Classification:
H04L 5/04
US Classification:
370208, 370210, 375347
Abstract:
The present invention provides an apparatus and method of multiple antenna receiver combining of high data rate wideband packetized wireless communication signals, where the apparatus includes M receive antennas, receiving M high data rate wideband packetized wireless communication signals, where each of the signals includes N frequency bins. The apparatus, in an exemplary embodiment, includes (1) a joint timing recovery units that perform joint coarse signal timing estimation, joint frequency offset estimation, and joint fine timing estimation on each of the signals, (2) M Fast Fourier Transform units (FFTs) that each convert the digital data for each of the M signals into frequency domain information for each of the N received frequencies and that output Q pilots for each of the signals, where Q is a positive integer, and (3) a combiner that weights and combines the outputs of the M FFTs for each of the N received frequencies.
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Yi-Hsiu H Wang from Palo Alto, CA Get Report