中国邮电高校学报(英文) ›› 2012, Vol. 19 ›› Issue (1): 50-54.doi: 10.1016/S1005-8885(11)60227-6

• Wireless • 上一篇    下一篇

Rate estimate for regular LDPCA codec in distributed video coding

明阳阳,杨波,QUAN Zi-Yi,MEN Ai-dong   

  1. 北京邮电大学 信息与通信工程学院
  • 收稿日期:2011-06-01 修回日期:2011-10-11 出版日期:2012-02-28 发布日期:2012-02-21
  • 通讯作者: 明阳阳 E-mail:yitianxk@126.com

Rate estimate for regular LDPCA codec in distributed video coding

  1. School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2011-06-01 Revised:2011-10-11 Online:2012-02-28 Published:2012-02-21
  • Contact: Yang-Yang MING E-mail:yitianxk@126.com

摘要:

Accumulated low density parity check (LDPCA) codec is proposed for DISCOVER project in distributed video coding (DVC), which offers flexible coding rate. Although it can use feedback channel to adapt the rate to the correlation of the video, but in real applications, using feedback channel can not always be possible. To solve this problem, some researchers proposed estimating the code rate at the encoder but the performance was not very good. Based on their researches, this paper considers the impact of convergence rate for iteration on rate estimate, which can be calculated using its check matrix. As a pilot study, this paper pays attention to the regular LDPCA codec. At the same time, it considers the impact of deviation in the estimated crossover probability, which gives some constraints to rate estimate. In the experiment, the proposed algorithm can improve the rate-distortion performance by up to 1 dB–1.2 dB.

关键词:

LDPCA, distributed video coding, rate estimate, regular LDPCA codec, crossover probability deviation

Abstract:

Accumulated low density parity check (LDPCA) codec is proposed for DISCOVER project in distributed video coding (DVC), which offers flexible coding rate. Although it can use feedback channel to adapt the rate to the correlation of the video, but in real applications, using feedback channel can not always be possible. To solve this problem, some researchers proposed estimating the code rate at the encoder but the performance was not very good. Based on their researches, this paper considers the impact of convergence rate for iteration on rate estimate, which can be calculated using its check matrix. As a pilot study, this paper pays attention to the regular LDPCA codec. At the same time, it considers the impact of deviation in the estimated crossover probability, which gives some constraints to rate estimate. In the experiment, the proposed algorithm can improve the rate-distortion performance by up to 1 dB–1.2 dB.

Key words:

LDPCA, distributed video coding, rate estimate, regular LDPCA codec, crossover probability deviation

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