Patents by Inventor YEN CHIN

YEN CHIN 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).

  • Patent number: 8108762
    Abstract: An operating method and a circuit for low density parity check (LDPC) decoders, in which original bit nodes are incorporated into check nodes for simultaneous operation. The bit node messages are generated according to the difference between the newly generated check messages and the previous check node messages. The bit node messages can be updated immediately, and the decoder throughput can be improved. The required memory of LDPC decoders can be effectively reduced, and the decoding speed can also be enhanced.
    Type: Grant
    Filed: November 13, 2007
    Date of Patent: January 31, 2012
    Assignee: National Chiao Tung University
    Inventors: Chih-Hao Liu, Yen-Chin Liao, Chen-Yi Lee, Hsie-Chia Chang, Yarsun Hsu
  • Publication number: 20110317541
    Abstract: A block interleaving method for interleaving data of a transmitter in a wireless communication system is disclosed. The wireless communication system supports a multi-input multi-output (MIMO) technique for transmitting data via a plurality of spatial streams. The block interleaving method includes when the transmitter transmits a plurality of data through the MIMO technique, determining an order of the plurality of data according to the following equation, r = ( j - ( ( ( i SS - 1 ) × M ) ? mod ? q + q × floor ? ( i SS - 1 q ) ) × N ROT ? × BPSCS ? ( i SS ) ) ? mod ? N CBPSS ? ( i SS ) ; ? j = 0 , 1 , … ? , N CBPSS ? ( i SS ) - 1 ; ? M = 1 , 2 , … ? , q - 1.
    Type: Application
    Filed: April 8, 2011
    Publication date: December 29, 2011
    Inventors: Yen-Chin Liao, Yung-Szu Tu, Cheng-Hsuan Wu
  • Publication number: 20110317676
    Abstract: A block interleaving method for interleaving data of a transmitter in a wireless communication system is disclosed. The wireless communication system supports a multi-input multi-output (MIMO) technique for transmitting data via a plurality of spatial streams. The block interleaving method includes when the transmitter transmits a plurality of data through the MIMO technique, determining an order of the plurality of data according to the following equation, r = ( j - ( ( ( i SS - 1 ) × M ) ? mod ? 7 + 7 × floor ? ( i SS - 1 7 ) ) × N ROT × N BPSCS ? ( i SS ) ) ? mod ? N CBPSS ? ( i SS ) ; j = 0 , 1 , … ? , N CBPSS ? ( i SS ) - 1 ; M = 1 , 2 , … ? , 6.
    Type: Application
    Filed: April 5, 2011
    Publication date: December 29, 2011
    Inventors: Yen-Chin Liao, Yung-Szu Tu, Cheng-Hsuan Wu
  • Publication number: 20110281534
    Abstract: A method of reducing a signal peak to average power ratio (PAPR) for a transmission channel in a wireless communication system is disclosed. The transmission channel is divided into a plurality of channel segments, and the method includes calculating PAPRs corresponding to the plurality of channel segments by a plurality of phase rotation vectors; selecting a plurality of specified phase rotation vectors from the plurality of phase rotation vectors according to the calculated PAPRs; and using one of the plurality of specified phase rotation vectors to rotate a phase of a signal to be transmitted.
    Type: Application
    Filed: November 8, 2010
    Publication date: November 17, 2011
    Inventors: Yen-Chin Liao, Cheng-Hsuan Wu, Yung-Szu Tu
  • Publication number: 20110280326
    Abstract: A method for clustering multiple stations for a MIMO communication system comprises the steps of: assigning a plurality of stations of a MIMO communication system to a plurality of clusters, wherein each station is assigned to at least one cluster, and at least one cluster is assigned with more than one station; and assigning the plurality of clusters to a plurality of sets, wherein each cluster is assigned to a set.
    Type: Application
    Filed: February 11, 2011
    Publication date: November 17, 2011
    Applicant: RALINK TECHNOLOGY CORPORATION
    Inventors: YUNG SZU TU, YEN CHIN LIAO, CHENG HSUAN WU
  • Publication number: 20110280335
    Abstract: A method for multi-channel transmission with multiple frequency segments comprises the steps of: determining a plurality of non-contiguous frequency segments from an available frequency band of a communication system, wherein each frequency segment comprises a plurality of contiguous channels; determining available channels from the channels in the plurality of non-contiguous frequency segments, wherein the number of available channels is less than or equal to the number of total channels in the plurality of non-contiguous frequency segments; determining a primary channel from the available channels; performing channel bonding technique on the available channels; and performing multi-channel transmission by performing dynamic channel selection technique on the available channels.
    Type: Application
    Filed: February 11, 2011
    Publication date: November 17, 2011
    Applicant: RALINK TECHNOLOGY CORPORATION
    Inventors: YUNG SZU TU, YEN CHIN LIAO, CHENG HSUAN WU, CHIH KUN CHANG
  • Publication number: 20110280232
    Abstract: A method of arranging a packet in a wireless communication system includes a preamble sequence and a data sequence. The preamble sequence includes a legacy training field (L-TF), a legacy signal field (L-SIG), a very high throughput signal field (VHT-SIG), a very high throughput short training field (VHT-STF) and at least one very high throughput long training field (VHT-LTF). The method includes generating a first VHT-SIG field and a second VHT-SIG field according to the VHT-SIG field; and arranging the L-TF field, the L-SIG field, the first VHT-SIG field, the VHT-STF field, one of the at least one VHT-LTF fields, the second VHT-SIG field and the rest of the at least one VHT-LTF fields in a predetermined sequence.
    Type: Application
    Filed: December 28, 2010
    Publication date: November 17, 2011
    Inventors: Cheng-Hsuan Wu, Yen-Chin Liao, Yung-Szu Tu
  • Publication number: 20110222612
    Abstract: A method for determining signal phase rotation of sub-channels within a contiguous transmission bandwidth comprises the steps of: determining a fundamental set of phase rotations; performing a cyclic shift operation for the fundamental set of phase rotations to generate a cyclic-shifted set of phase rotations; multiplying the cyclic-shifted set of phase rotations by a complex constant to generate a final set of phase rotations; and determining the phase rotation of each sub-channel within the contiguous transmission bandwidth according to the final set of phase rotations.
    Type: Application
    Filed: February 11, 2011
    Publication date: September 15, 2011
    Applicant: RALINK TECHNOLOGY CORPORATION
    Inventors: YUNG SZU TU, YEN CHIN LIAO, CHENG HSUAN WU
  • Publication number: 20110222458
    Abstract: The present invention discloses a multi-user (MU) downlink and downlink transmission method for a communication system. The communication system includes an access point (AP) and a plurality of stations. The MU transmission method includes steps of the AP deciding a first group of stations in a first scheduling period based on a channel condition, and the AP and the first group of stations performing simultaneously transmission during a MU media access control period.
    Type: Application
    Filed: February 25, 2011
    Publication date: September 15, 2011
    Inventors: Cheng-Hsuan Wu, Yen-Chin Liao, Yung-Szu Tu
  • Publication number: 20110222519
    Abstract: The present invention discloses a phase rotating method for a wireless local area network (WLAN) device, which utilizes a channel including a plurality of sub-channels. The phase rotating method includes steps of generating a plurality of data sequences corresponding to the plurality of sub-channels, and making the plurality of data sequences with phase rotations according to a plurality of angles corresponding to the plurality of sub-channels. The channel is a non-contiguous channel.
    Type: Application
    Filed: March 9, 2011
    Publication date: September 15, 2011
    Inventors: Yen-Chin Liao, Cheng-Hsuan Wu, Yung-Szu Tu
  • Publication number: 20110185000
    Abstract: A low-error reduced-width multiplier is provided by the present invention. The multiplier can dynamically compensate the truncation error. The compensation value is derived by the dependencies among the multiplier partial products, and thus, can be analyzed according to the multiplication type and the multiplier input statistics.
    Type: Application
    Filed: February 28, 2011
    Publication date: July 28, 2011
    Applicant: National Chiao Tung University
    Inventors: Yen-Chin Liao, Hsie-Chia Chang
  • Publication number: 20110174359
    Abstract: A solar energy receiver array comprises a plurality of solar energy receivers arranged in an X by Y array. A protected housing includes a plurality of sides defining an opening therein. The plurality of solar energy receivers are arranged in the X by Y array may be lowered into the opening within the protective housing to protect the plurality of solar energy receivers arranged in the X by Y array from external winds.
    Type: Application
    Filed: January 13, 2011
    Publication date: July 21, 2011
    Applicant: ASPECT SOLAR PTE LTD.
    Inventors: ESMOND GOEI, TAO ZHAO, YEN CHIN
  • Publication number: 20110176627
    Abstract: The present invention discloses a multi-user (MU) transmission method for a multiple input multiple output (MIMO) transmission system comprising a first station and a plurality of second stations. The MU transmission method includes the step of the first station performing simultaneous transmission to a first group of stations of the plurality of second stations in a first transmission interval.
    Type: Application
    Filed: December 15, 2010
    Publication date: July 21, 2011
    Inventors: Cheng-Hsuan Wu, Yen-Chin Liao, Yung-Szu Tu
  • Publication number: 20110176626
    Abstract: The present invention disclose a pilot signal determination method for a wireless communication system. The wireless communication system utilizes a plurality of sub-carriers. The pilot signal determination method includes steps of generating at least one vector corresponding to at least one sub-channel; and determining a plurality of pilot signals according to the at least one vector.
    Type: Application
    Filed: December 13, 2010
    Publication date: July 21, 2011
    Inventors: Yen-Chin Liao, Cheng-Hsuan Wu, Yung-Szu Tu
  • Publication number: 20110176631
    Abstract: A communication method for a MIMO communication system comprises the steps of: transmitting a plurality of first streams modulated in a non space division multiplexing manner from a transmitter to a plurality of receiving stations; and transmitting a plurality of second streams following the plurality of first streams modulated in a space division multiplexing manner from the transmitter to the plurality of receiving stations. Each of the first streams comprises a legacy short training field, a legacy long training field, a legacy signal field and at least a very high throughput signal field, and each of the first streams has the same length. Each of the second streams comprises a very high throughput short training field, a plurality of very high throughput long training fields and a data field, and each of the second streams has the same length.
    Type: Application
    Filed: January 13, 2011
    Publication date: July 21, 2011
    Applicant: RALINK TECHNOLOGY CORPORATION
    Inventors: YUNG SZU TU, CHENG HSUAN WU, YEN CHIN LIAO
  • Publication number: 20110170522
    Abstract: A wireless transmission method comprises the steps of: determining transmission time slots and start antenna indexes of a plurality of stations in a spatial division multiple access system according to the number of antennas of the plurality of stations; broadcasting a control frame signal to the plurality of stations and waiting for requests to transmit signals from the plurality of stations, wherein the control frame signal includes the transmission time slots and start antenna indexes of the plurality of stations; receiving the requests to transmit signals from the plurality of stations; and broadcasting a clear to transmit signal to the plurality of stations based on the received request to transmit signals. The requests to transmit signals of the plurality of stations, which are transmitted based on the transmission time slots and start antenna indexes of the plurality of stations, conform to a multi-input multi-output transmission standard of the access point.
    Type: Application
    Filed: January 10, 2011
    Publication date: July 14, 2011
    Applicant: RALINK TECHNOLOGY CORPORATION
    Inventors: YEN CHIN LIAO, CHENG HSUAN WU, YUNG SZU TU
  • Publication number: 20110119567
    Abstract: A signal processing circuit in a transmitter of a communication system comprises an appending circuit, a scrambler, an FEC encoder and a stream parser. The appending circuit is configured to divide a packet data string into a plurality of divided data strings, append a predetermined string to the tail of each divided data string, and output the appended data strings sequentially. The scrambler is configured to perform a scramble operation for the appended data strings. The FEC encoder is configured to sequentially encode the output data strings of the scrambler into convolutional code-words complying with the requirements of a MIMO communication system. The stream parser is configured to forward the convolutional code-words to at least a stream signal processing circuit.
    Type: Application
    Filed: November 12, 2010
    Publication date: May 19, 2011
    Applicant: RALINK TECHNOLOGY CORPORATION
    Inventors: YUNG SZU TU, YEN CHIN LIAO, CHENG HSUAN WU
  • Patent number: 7941734
    Abstract: The present invention proposes a method and apparatus for decoding BCH codes and Reed-Solomon codes, in which a modified Berlekamp-Massey algorithm is used to perform the decoding process and the efficiency of the decoder can be improved by re-defining the error locating polynomial as a reverse error locating polynomial, while the operation of the decoding process can be further realized by a common re-configurable module. Furthermore, the architecture of the decoder is consisted of a plurality of sets of re-configurable modules in order to provide parallel operations with different degrees of parallel so that the decoding speed requirement of the decoder in different applications can be satisfied.
    Type: Grant
    Filed: August 22, 2008
    Date of Patent: May 10, 2011
    Assignee: National Chiao Tung University
    Inventors: Hsie-Chia Chang, Jau-Yet Wu, Yen-Chin Liao
  • Publication number: 20110069775
    Abstract: A signal processing method for a MIMO system comprises the steps of: arranging a plurality of frequency domain MIMO data streams into a plurality of groups, wherein each group comprises at least a frequency domain MIMO data stream; partitioning sub-carriers of each of the plurality of frequency domain MIMO data streams into a plurality of sub-channels; performing phase rotation for the plurality of frequency domain MIMO data streams, wherein the phases of the sub-carriers in a sub-channel are rotated the same amount, and different phase rotations are performed on different groups of the plurality of frequency domain MIMO data streams; transforming the plurality of frequency domain MIMO data streams into a plurality of time domain MIMO data streams; and performing CSD for the plurality of time domain MIMO data streams if each group comprises more than one frequency domain MIMO data stream, wherein the amount of CSD is different for each time domain MIMO data stream in a group.
    Type: Application
    Filed: March 19, 2010
    Publication date: March 24, 2011
    Applicant: RALINK TECHNOLOGY CORPORATION
    Inventors: Cheng Hsuan WU, Yen Chin LIAO, Yung Szu TU
  • Publication number: 20110013547
    Abstract: A method of generating preamble sequence for a wireless communication system includes generating a frequency-domain preamble sequence related to a packet, transforming the frequency-domain preamble sequence into a first time-domain preamble sequence, performing a cyclic shift delaying process on the first time-domain preamble sequence for generating a second time-domain preamble sequence, and normalizing power of the first time-domain preamble sequence and the second time-domain preamble sequence for generating the first field of a preamble of the packet.
    Type: Application
    Filed: July 14, 2010
    Publication date: January 20, 2011
    Inventors: Yen-Chin Liao, Cheng-Hsuan Wu, Yung-Szu Tu