Patents by Inventor Lai-Huei Wang
Lai-Huei Wang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8693570Abstract: A wireless communication method may include receiving a first data stream comprising a data sequence and computing a permutation sequence based on a content of the received first data stream. The permutation sequence is a non-predetermined sequence. The method may further include performing a permutation on the first data stream based on the permutation sequence to generate a permuted first data stream being configured for wireless transmission.Type: GrantFiled: October 26, 2009Date of Patent: April 8, 2014Assignee: Industrial Technology Research InstituteInventors: Lai-Huei Wang, Chia-Lung Tsai, Yu-Tao Hsieh, Pang An Ting, Jen-Yuan Hsu
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Publication number: 20130279627Abstract: An apparatus for generating a pilot pattern for data to be transmitted in an orthogonal frequency-division multiplexing (OFDM) based communication system, having a for allocating pilot symbols for a plurality of data streams to form a plurality of pilot clusters in the pilot pattern, wherein each of the pilot clusters includes ones of the pilot symbols, the ones of the pilot symbols being for respectively different ones of the data streams. The apparatus also includes a mechanism for moving at least one of the pilot clusters from a first location in the resource block to a second location in the resource block to generate a second pilot pattern, the first and second locations being symmetrical in time, and a mechanism for generating a third pilot pattern based on the first and second pilot patterns.Type: ApplicationFiled: June 18, 2013Publication date: October 24, 2013Inventors: Jia-Hao Wu, Lai-Huei Wang, Yu-Tao Hsieh, Pang-An Ting
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Patent number: 8488694Abstract: A method for generating a pilot pattern for data to be transmitted in an orthogonal frequency-division multiplexing (OFDM) based communication system includes: allocating pilot symbols for a plurality of data streams to form a plurality of pilot clusters in the pilot pattern, wherein each of the pilot clusters includes ones of the pilot symbols, the ones of the pilot symbols being for respectively different ones of the data streams.Type: GrantFiled: April 28, 2009Date of Patent: July 16, 2013Assignee: Industrial Technology Research InstituteInventors: Jia-Hao Wu, Lai-Huei Wang, Yu-Tao Hsieh, Pang-An Ting
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Patent number: 8406279Abstract: A method for pilot design for data to be transmitted by an orthogonal frequency-division multiplexing (OFDM) based communication system, the data being represented by a plurality of OFDM symbols. The method includes allocating pilot symbols for a data stream to be included in ones of the OFDM symbols; and performing a frequency shift on at least one of the OFDM symbols, to reduce frequency distance disparities among the pilot symbols.Type: GrantFiled: September 17, 2008Date of Patent: March 26, 2013Assignee: Industrial Technology Research InstituteInventors: Yu-Tao Hsieh, Jen-Yuan Hsu, Pang-An Ting, Lai-Huei Wang
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Patent number: 8331482Abstract: A subcarrier allocation method for use by a transmitter, the transmitter being configured to, when transmitting first and second data streams, allocate pilot symbols for the first and second data streams to subcarriers, such that a first plurality of subcarriers carry the pilot symbols for the first data stream and a second plurality of subcarriers carry the pilot symbols for the second data stream. The method includes allocating, when the transmitter transmits the first data stream but does not transmit the second data stream, the second plurality of subcarriers to carry no formation or information relating to the first data stream.Type: GrantFiled: June 10, 2009Date of Patent: December 11, 2012Assignee: Industrial Technology Research InstituteInventors: Lai-Huei Wang, Chia-Lung Tsai, Yu-Tao Hsieh, Pang-An Ting, Jen-Yuan Hsu
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Patent number: 8218695Abstract: A method for removing ICI for a received symbol is provided. Firstly, a transmitted symbol is received via a wireless channel within a symbol time so as to obtain the received symbol. The transmitted symbol includes P identical original partial data, wherein P is a positive integer larger than 1. The received symbol includes P received partial data corresponding to the original partial data, respectively. Next, on a time domain at least two of the P received partial data are copied so as to obtain at least two copied partial data. Each copied partial data includes P copies of its corresponding received partial data. After that, an estimated ICI of the time domain is determined according to the product of a predetermined constant array and the difference between the copied partial data. Afterwards, the estimated ICI is subtracted from the received symbol so as to obtain an output symbol.Type: GrantFiled: October 1, 2008Date of Patent: July 10, 2012Assignee: Industrial Technology Research InstituteInventors: Jen-Yuan Hsu, Lai-Huei Wang, Jiun-Yo Lai, Pang-An Ting
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Patent number: 8139693Abstract: An estimation method is provided for use in a receiver of an OFDM (orthogonal frequency division multiplexing) system to estimate the ICI (inter-carrier interference) and the noise power of a channel. Two pilot signals respectively carried by two subcarriers are received from the channel wherein the two pilot signals are adjacent and differ by a first phase angle. Another two pilot signals respectively carried by another two subcarrier are received from the channel wherein the another two pilot signals are adjacent and differ by a second phase angle. According to some embodiments of the invention, these phases are correlated with the ICI power, but are uncorrelated with the noise power. The estimation method then individually estimates the ICI power and noise power according to the first phase and the second phase.Type: GrantFiled: June 19, 2009Date of Patent: March 20, 2012Assignee: Industrial Technology Research InstituteInventors: Lai-Huei Wang, Pang-An Ting, Chien-Yu Kao, Chia-Hung Lin
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Patent number: 7782757Abstract: A method, and device implementing the method, for adaptively allocating pilot signals in a wireless communication system. The method includes receiving channel data, including channel length (L) data, inter-carrier interference power (PICI) data, coherence time (CT) data, and a number of subcarriers (N). The method further includes selecting, when L is greater than a first channel length threshold (LTH1), a first number of pilot signals between a minimum value of L and a maximum number of pilot signals NP,MAX, wherein the first number of pilot signals NP are equally spaced in time according to the CT data, and equally spaced in frequency. Further, the method includes selecting, when L is less than LTH1 and PICI is less than a power threshold (PTH), a second number of pilot signals such that the second number of pilot signals is between the minimum value of L and NP,MAX, wherein the second number of pilot signals are equally spaced in time according to the CT data, and equally spaced in frequency.Type: GrantFiled: September 4, 2008Date of Patent: August 24, 2010Assignee: Industrial Technology Research InstituteInventors: Lai-Huei Wang, Pang-An Ting, Jia-Hao Wu, Jiun-Yo Lai
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Publication number: 20100158143Abstract: A subcarrier allocation method for use by a transmitter, the transmitter being configured to, when transmitting first and second data streams, allocate pilot symbols for the first and second data streams to subcarriers, such that a first plurality of subcarriers carry the pilot symbols for the first data stream and a second plurality of subcarriers carry the pilot symbols for the second data stream. The method includes allocating, when the transmitter transmits the first data stream but does not transmit the second data stream, the second plurality of subcarriers to carry no formation or information relating to the first data stream.Type: ApplicationFiled: June 10, 2009Publication date: June 24, 2010Inventors: Lai-Huei WANG, Chia-Lung TSAI, Yu-Tao HSIEH, Pang-An TING, Jen-Yuan HSU
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Publication number: 20100111219Abstract: A wireless communication method may include receiving a first data stream comprising a data sequence and computing a permutation sequence based on a content of the received first data stream. The permutation sequence is a non-predetermined sequence. The method may further include performing a permutation on the first data stream based on the permutation sequence to generate a permuted first data stream being configured for wireless transmission.Type: ApplicationFiled: October 26, 2009Publication date: May 6, 2010Inventors: Lai-Huei WANG, Chia-Lung Tsai, Yu-Tao Hsieh, Pang An Ting, Jen-Yuan Hsu
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Publication number: 20100104053Abstract: An estimation method is provided for use in a receiver of an OFDM (orthogonal frequency division multiplexing) system to estimate the ICI (inter-carrier interference) and the noise power of a channel. Two pilot signals respectively carried by two subcarriers are received from the channel wherein the two pilot signals are adjacent and differ by a first phase angle. Another two pilot signals respectively carried by another two subcarrier are received from the channel wherein the another two pilot signals are adjacent and differ by a second phase angle. According to some embodiments of the invention, these phases are correlated with the ICI power, but are uncorrelated with the noise power. The estimation method then individually estimates the ICI power and noise power according to the first phase and the second phase.Type: ApplicationFiled: June 19, 2009Publication date: April 29, 2010Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Lai-Huei Wang, Pang-An Ting, Chien-Yu Kao, Chia-Hung Lin
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Publication number: 20090279623Abstract: A method for generating a pilot pattern for data to be transmitted in an orthogonal frequency-division multiplexing (OFDM) based communication system includes: allocating pilot symbols for a plurality of data streams to form a plurality of pilot clusters in the pilot pattern, wherein each of the pilot clusters includes ones of the pilot symbols, the ones of the pilot symbols being for respectively different ones of the data streams.Type: ApplicationFiled: April 28, 2009Publication date: November 12, 2009Inventors: Jia-Hao Wu, Lai-Huei Wang, Yu-Tao Hsieh, Pang-An Ting
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Publication number: 20090257516Abstract: A method for pilot design for data to be transmitted by an orthogonal frequency-division multiplexing (OFDM) based communication system, the data being represented by a plurality of OFDM symbols. The method includes allocating pilot symbols for a data stream to be included in ones of the OFDM symbols; and performing a frequency shift on at least one of the OFDM symbols, to reduce frequency distance disparities among the pilot symbols.Type: ApplicationFiled: September 17, 2008Publication date: October 15, 2009Inventors: Yu-Tao HSIEH, Jen-Yuan HSU, Pang-An TING, Lai-Huei WANG
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Publication number: 20090180559Abstract: A method for removing ICI for a received symbol is provided. Firstly, a transmitted symbol is received via a wireless channel within a symbol time so as to obtain the received symbol. The transmitted symbol includes P identical original partial data, wherein P is a positive integer larger than 1. The received symbol includes P received partial data corresponding to the original partial data, respectively. Next, on a time domain at least two of the P received partial data are copied so as to obtain at least two copied partial data. Each copied partial data includes P copies of its corresponding received partial data. After that, an estimated ICI of the time domain is determined according to the product of a predetermined constant array and the difference between the copied partial data. Afterwards, the estimated ICI is subtracted from the received symbol so as to obtain an output symbol.Type: ApplicationFiled: October 1, 2008Publication date: July 16, 2009Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventors: Jen-Yuan Hsu, Lai-Huei Wang, Jiun-Yo Lai, Pang-An Ting
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Publication number: 20090092194Abstract: A method, and device implementing the method, for adaptively allocating pilot signals in a wireless communication system. The method includes receiving channel data, including channel length (L) data, inter-carrier interference power (PICI) data, coherence time (CT) data, and a number of subcarriers (N). The method further includes selecting, when L is greater than a first channel length threshold (LTH1), a first number of pilot signals between a minimum value of L and a maximum number of pilot signals NP,MAX, wherein the first number of pilot signals NP are equally spaced in time according to the CT data, and equally spaced in frequency. Further, the method includes selecting, when L is less than LTH1 and PICI is less than a power threshold (PTH), a second number of pilot signals such that the second number of pilot signals is between the minimum value of L and NP,MAX, wherein the second number of pilot signals are equally spaced in time according to the CT data, and equally spaced in frequency.Type: ApplicationFiled: September 4, 2008Publication date: April 9, 2009Inventors: Lai-Huei Wang, Pang-An Ting, Jia-Hao Wu, Jiun-Yo Lai