Ruifeng S Wang from Lees Summit, MO, age 60

Resumes

Ruifeng Wang

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Location:

United States

Ruifeng Wang

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Us Patents

Turbo Channel Estimation For Ofdm Systems
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US Patent:

7440507, Oct 21, 2008
Filed:

Jul 26, 2005
Appl. No.:

11/190373
Inventors:

Titus Lo - Redmond WA, US
Ruifeng Wang - Redmond WA, US
Assignee:

AT&T Mobility II LLC - Atlanta GA
International Classification:

H04L 27/28
US Classification:

375260, 375267, 375285, 375347, 375348, 375349, 455 65, 455134, 4552262, 455296, 370208
Abstract:

A system and method for estimating a channel in a wireless receiver is disclosed. The method preferably applies to a communication system using the OFDM standard. The method comprises receiving a block of “n” transmitted symbols, the symbols including pilot symbols and “d” data symbols, estimating a channel using the pilot symbols to create a channel estimate, choosing a group of “m” strongest symbols from the “d” received symbols, compensating the “m” strongest symbols using the channel estimate to create a group of “m” compensated symbols, re-estimating the channel using the group of “m” compensated symbols and pilot symbols; and either (1) repeating the steps of choosing a group of “m” strongest symbols, compensating the group of “m” strongest symbols and re-estimating the channel, or (2) using a latest channel estimate to compensate all symbols within the block. The system comprises a wireless receiver having an estimator programmed, for example, using DSP or ASIC and imbedded into the wireless system design software for accomplishing the steps set forth according to the method.

Method And System For Multi-Carrier Packet Communication With Reduced Overhead
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US Patent:

7948944, May 24, 2011
Filed:

Sep 28, 2006
Appl. No.:

11/908257
Inventors:

Xiaodong Li - Kirkland WA, US
Haiming Huang - Bellevue WA, US
Titus Lo - Bellevue WA, US
Ruifeng Wang - Sammamish WA, US
Assignee:

Neocific, Inc. - Bellevue WA
International Classification:

H04W 4/00
US Classification:

370330
Abstract:

A method and system for minimizing the control overhead in a multi-carrier wireless communication network that utilizes a time-frequency resource is disclosed. In some embodiments, one or more zones in the time-frequency resource are designated for particular applications, such as a zone dedicated for voice-over-IP (VoIP) applications. By grouping applications of a similar type together within a zone, a reduction in the number of bits necessary for mapping a packet stream to a portion of the time-frequency resource can be achieved. In some embodiments, modular coding schemes associated with the packet streams may be selected that further reduce the amount of necessary control information. In some embodiments, packets may be classified for transmission in accordance with application type, QoS parameters, and other properties. In some embodiments, improved control messages may be constructed to facilitate the control process and minimize associated overhead.

Turbo Channel Estimation For Ofdm Systems
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US Patent:

8503548, Aug 6, 2013
Filed:

Dec 17, 2009
Appl. No.:

12/640234
Inventors:

Titus Lo - Redmond WA, US
Ruifeng Wang - Redmond WA, US
Assignee:

AT&T Mobility II LLC - Atlanta GA
International Classification:

H04L 27/28
US Classification:

375260, 375267, 375285, 375347, 375349, 455134, 4552262, 455296, 370208
Abstract:

A system and method for estimating a channel in a wireless receiver is disclosed. The method preferably applies to a communication system using the OFDM standard. The method comprises receiving a block of “n” transmitted symbols, the symbols including pilot symbols and “d” data symbols, estimating a channel using the pilot symbols to create a channel estimate, choosing a group of “m” strongest symbols from the “d” received symbols, compensating the “m” strongest symbols using the channel estimate to create a group of “m” compensated symbols, re-estimating the channel using the group of “m” compensated symbols and pilot symbols; and either (1) repeating the steps of choosing a group of “m” strongest symbols, compensating the group of “m” strongest symbols and re-estimating the channel, or (2) using a latest channel estimate to compensate all symbols within the block. The system comprises a wireless receiver having an estimator programmed, for example, using DSP or ASIC and imbedded into the wireless system design software for accomplishing the steps set forth according to the method.

Method And System For Multi-Carrier Packet Communication With Reduced Overhead
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US Patent:

8634376, Jan 21, 2014
Filed:

Sep 28, 2012
Appl. No.:

13/631735
Inventors:

Haiming Huang - Bellevue WA, US
Titus Lo - Bellevue WA, US
Ruifeng Wang - Sammamish WA, US
Assignee:

Neocific, Inc. - Bellevue WA
International Classification:

H04W 4/00
US Classification:

370330
Abstract:

A method and system for minimizing the control overhead in a multi-carrier wireless communication network that utilizes a time-frequency resource is disclosed. In some embodiments, one or more zones in the time-frequency resource are designated for particular applications, such as a zone dedicated for voice-over-IP (VoIP) applications. By grouping applications of a similar type together within a zone, a reduction in the number of bits necessary for mapping a packet stream to a portion of the time-frequency resource can be achieved. In some embodiments, modular coding schemes associated with the packet streams may be selected that further reduce the amount of necessary control information. In some embodiments, packets may be classified for transmission in accordance with application type, QoS parameters, and other properties. In some embodiments, improved control messages may be constructed to facilitate the control process and minimize associated overhead.

Turbo Channel Estimation For Ofdm Systems
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US Patent:

20090052565, Feb 26, 2009
Filed:

Oct 21, 2008
Appl. No.:

12/255404
Inventors:

Titus Lo - Redmond WA, US
Ruifeng Wang - Redmond WA, US
International Classification:

H04L 27/28
US Classification:

375260, 375316
Abstract:

A system and method for estimating a channel in a wireless receiver is disclosed. The method preferably applies to a communication system using the OFDM standard. The method comprises receiving a block of “n” transmitted symbols, the symbols including pilot symbols and “d” data symbols, estimating a channel using the pilot symbols to create a channel estimate, choosing a group of “m” strongest symbols from the “d” received symbols, compensating the “m” strongest symbols using the channel estimate to create a group of “m” compensated symbols, re-estimating the channel using the group of “m” compensated symbols and pilot symbols; and either (1) repeating the steps of choosing a group of “m” strongest symbols, compensating the group of “m” strongest symbols and re-estimating the channel, or (2) using a latest channel estimate to compensate all symbols within the block. The system comprises a wireless receiver having an estimator programmed, for example, using DSP or ASIC and imbedded into the wireless system design software for accomplishing the steps set forth according to the method.

Method And System For Multi-Carrier Packet Communication With Reduced Overhead
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US Patent:

20110222505, Sep 15, 2011
Filed:

May 24, 2011
Appl. No.:

13/115055
Inventors:

Xiaodong Li - Kirkland WA, US
Haiming Huang - Bellevue WA, US
Titus Lo - Bellevue WA, US
Ruifeng Wang - Sammamish WA, US
International Classification:

H04W 72/04
US Classification:

370330
Abstract:

A method and system for minimizing the control overhead in a multi-carrier wireless communication network that utilizes a time-frequency resource is disclosed. In some embodiments, one or more zones in the time-frequency resource are designated for particular applications, such as a zone dedicated for voice-over-IP (VoIP) applications. By grouping applications of a similar type together within a zone, a reduction in the number of bits necessary for mapping a packet stream to a portion of the time-frequency resource can be achieved. In some embodiments, modular coding schemes associated with the packet streams may be selected that further reduce the amount of necessary control information. In some embodiments, packets may be classified for transmission in accordance with application type, QoS parameters, and other properties. In some embodiments, improved control messages may be constructed to facilitate the control process and minimize associated overhead.

Turbo Channel Estimation For Ofdm Systems
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US Patent:

20130022161, Jan 24, 2013
Filed:

Jul 25, 2012
Appl. No.:

13/557736
Inventors:

Titus Lo - Redmond WA, US
Ruifeng Wang - Redmond WA, US
International Classification:

H04B 1/10
US Classification:

375349
Abstract:

A system and method for estimating a channel in a wireless receiver is disclosed. The method comprises receiving a block of “n” transmitted symbols, the symbols including pilot symbols and “d” data symbols, estimating a channel using the pilot symbols to create a channel estimate, choosing a group of “m” strongest symbols from the “d” received symbols, compensating the “m” strongest symbols using the channel estimate to create a group of “m” compensated symbols, re-estimating the channel using the group of “m” compensated symbols and pilot symbols; and either () repeating the steps of choosing a group of “m” strongest symbols, compensating the group of “m” strongest symbols and re-estimating the channel, or () using a latest channel estimate to compensate all symbols within the block. The system comprises a wireless receiver having an estimator programmed according to the method.

Turbo Channel Estimation For Ofdm Systems
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US Patent:

6940914, Sep 6, 2005
Filed:

Jun 11, 2001
Appl. No.:

09/878555
Inventors:

Titus Lo - Redmond WA, US
Ruifeng Wang - Redmond WA, US
Assignee:

Cingular Wireless II, LLC - Atlanta GA
International Classification:

H04L027/28
US Classification:

375260, 375267, 375285, 375347, 375348, 375349, 455 65, 455134, 4552262, 455296, 370208
Abstract:

A system and method for estimating a channel in a wireless receiver is disclosed. The method preferably applies to a communication system using the OFDM standard. The method comprises receiving a block of “n” transmitted symbols, the symbols including pilot symbols and “d” data symbols, estimating a channel using the pilot symbols to create a channel estimate, choosing a group of “m” strongest symbols from the “d” received symbols, compensating the “m” strongest symbols using the channel estimate to create a group of “m” compensated symbols, re-estimating the channel using the group of “m” compensated symbols and pilot symbols; and either (1) repeating the steps of choosing a group of “m” strongest symbols, compensating the group of “m” strongest symbols and re-estimating the channel, or (2) using a latest channel estimate to compensate all symbols within the block. The system comprises a wireless receiver having an estimator programmed, for example, using DSP or ASIC and imbedded into the wireless system design software for accomplishing the steps set forth according to the method.