Patents Assigned to Availink, Inc.
  • Family of LDPC codes for video broadcasting applications
    Patent number: 8689092
    Abstract: A family of quasi cyclic irregular low density parity check codes for video broadcasting applications. The parity check matrices of the constructed low density parity check codes have quasi-cyclic structures to facilitate hardware implementation and have proper check/bit degree distributions to offer frame error rate performance lower than 10?7.
    Type: Grant
    Filed: September 18, 2006
    Date of Patent: April 1, 2014
    Assignee: Availink, Inc.
    Inventors: Fengwen Sun, Ming Yang, Juntan Zhang, Yuhai Shi
  • Efficient frame structure for digital satellite communication
    Patent number: 8630223
    Abstract: A digital communications system and method to transmit and receive a digital communications signal wherein the digital signal has a plurality of frames, wherein at least two modulations are supported, and wherein each of the plurality of frames has the same number of symbols.
    Type: Grant
    Filed: February 24, 2010
    Date of Patent: January 14, 2014
    Assignee: Availink, Inc.
    Inventors: Ming Yang, Fengwen Sun, Fangyi She, Yimin Jiang, Guofang Sheng, Zhenliang Shi, Yingjiu Xu
  • Bit mapping scheme for an LDPC coded 32APSK system
    Patent number: 8369448
    Abstract: A digital communication system, having a transmitter to transmit a digital signal; and a receiver to receive the digital signal; wherein the digital signal utilizes a 32APSK system with FEC coding, and the signal is bit-mapped using gray mapping, and bits of the digital signal are ordered based on the values of a log likelihood ratio from a communications channel.
    Type: Grant
    Filed: September 18, 2006
    Date of Patent: February 5, 2013
    Assignee: Availink, Inc.
    Inventors: Juntan Zhang, Fengwen Sun
  • Interleaving scheme for an LDPC coded 32 APSK system
    Patent number: 8301960
    Abstract: An approach is provided for interleaving low density parity check (LDPC) encoded bits in 32APSK modulation systems. By assigning the bits determining modulation symbols based on different bit degrees, one can efficiently find the desirable tradeoff between error performance and error floor provided by the LDPC codes in use.
    Type: Grant
    Filed: February 22, 2010
    Date of Patent: October 30, 2012
    Assignee: Availink, Inc.
    Inventors: Juntan Zhang, Zhiyong Wu, Peng Gao, Fengwen Sun
  • Interleaving scheme for an LDPC coded QPSK/8PSK system
    Patent number: 8230299
    Abstract: An approach is provided for interleaving low density parity check (LDPC) encoded bits in QPSK/8PSK modulation systems. By assigning the bits determining modulation symbols based on different bit degrees, one can efficiently find the desirable tradeoff between error performance and error floor provided by the LDPC codes in use.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: July 24, 2012
    Assignee: Availink, Inc.
    Inventors: Ming Yang, Juntan Zhang, Zhiyong Wu, Fengwen Sun
  • INTERLEAVING SCHEME FOR AN LDPC CODED QPSK/8PSK SYSTEM
    Publication number: 20110258521
    Abstract: An approach is provided for interleaving low density parity check (LDPC) encoded bits in QPSK/8PSK modulation systems. By assigning the bits determining modulation symbols based on different bit degrees, one can efficiently find the desirable tradeoff between error performance and error floor provided by the LDPC codes in use.
    Type: Application
    Filed: March 1, 2010
    Publication date: October 20, 2011
    Applicant: AVAILINK, INC.
    Inventors: Ming Yang, Juntan Zhang, Zhiyong Wu, Fengwen Sun
  • Interleaving scheme for an LDPC coded 16APSK system
    Patent number: 8028219
    Abstract: An approach is provided for interleaving low density parity check (LDPC) encoded bits in 16ASPK modulation systems. By assigning the bits determining modulation symbols based on different bit degrees, one can efficiently find the desirable tradeoff between error performance and error floor provided by the LDPC codes in use.
    Type: Grant
    Filed: September 18, 2006
    Date of Patent: September 27, 2011
    Assignee: Availink, Inc.
    Inventors: Juntan Zhang, Peng Gao, Fengwen Sun
  • INTERLEAVING SCHEME FOR AN LDPC CODED 32 APSK SYSTEM
    Publication number: 20110202814
    Abstract: An approach is provided for interleaving low density parity check (LDPC) encoded bits in 32APSK modulation systems. By assigning the bits determining modulation symbols based on different bit degrees, one can efficiently find the desirable tradeoff between error performance and error floor provided by the LDPC codes in use.
    Type: Application
    Filed: February 22, 2010
    Publication date: August 18, 2011
    Applicant: AVAILINK, INC.
    Inventors: Juntan Zhang, Zhiyong Wu, Peng Gao, Fengwen Sun
  • BIT MAPPING SCHEME FOR AN LDPC CODED 16APSK SYSTEM
    Publication number: 20110173509
    Abstract: A digital communication system, having a transmitter to transmit a digital signal; and a receiver to receive the digital signal; wherein the digital signal utilizes a 16APSK system, and the signal is bit-mapped using gray mapping, and bits of the digital signal are ordered based on the values of a log likelihood ratio from a communications channel.
    Type: Application
    Filed: March 4, 2010
    Publication date: July 14, 2011
    Applicant: AVAILINK, INC.
    Inventors: Juntan Zhang, Xunchun Li, Fengwen Sun
  • EFFICIENT FRAME STRUCTURE FOR DIGITAL SATELLITE COMMUNICATION
    Publication number: 20110096718
    Abstract: A digital communications system and method to transmit and receive a digital communications signal wherein the digital signal has a plurality of frames, wherein at least two modulations are supported, and wherein each of the plurality of frames has the same number of symbols.
    Type: Application
    Filed: February 24, 2010
    Publication date: April 28, 2011
    Applicant: AVAILINK, INC.
    Inventors: Ming YANG, Fengwen SUN, Fangyi SHE, Yimin JIANG, Guofang SHENG, Zhenliang SHI, Yingjiu XU
  • EFFICIENT FRAMING SCHEMES FOR SUPPORTING VCM/ACM IN DIGITAL SATELLITE TRANSMISSION SYSTEMS
    Publication number: 20100316144
    Abstract: A digital communication system and method using a digital signal having a plurality of frames to transmit data, including a first frame and a second frame, wherein each of the plurality of frames has a frame structure; and wherein the first frame has, a plurality of codewords comprising user data, and a Next Frame Composition Table to set the structure for the second frame, and wherein the second frame has at least one codeword.
    Type: Application
    Filed: April 30, 2010
    Publication date: December 16, 2010
    Applicant: AVAILINK, INC.
    Inventors: Fengwen Sun, Ming Yang, Yimin Jiang, Guofang Sheng, Zhenliang Shi, Yingjiu Xu