JOINT NOISE DISTRIBUTION PARAMETER ESTIMATION AND LDPC DECODING USING VARIATIONAL BAYES

被引：0
|
作者：
Taheri, Y. Mohammad [1 ]
Ahmad, M. Omair [1 ]
Swamy, M. N. S. [1 ]
机构：
[1] Concordia Univ, Dept Elect & Comp Engn, Montreal, PQ H3G 1M8, Canada
来源：
2014 IEEE 57TH INTERNATIONAL MIDWEST SYMPOSIUM ON CIRCUITS AND SYSTEMS (MWSCAS) | 2014年
关键词：
VIDEO;
D O I：
暂无
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
In this work, we investigate the problem of estimating time-varying noise distribution parameter on a factor graph. A new message passing scheme is proposed by incorporating the variational Bayes (VB) into the belief propagation algorithm for estimating of time-varying noise distribution parameter in a low-density parity-check decoder. The scheme can also be used for the estimation of the correlation noise model parameter in distributed video coding. A Bayesian estimator is used to estimate this parameter by obtaining its posterior distribution given the channel output. The VB algorithm is employed to approximate the complex form of the posterior distribution with a simple distribution. Finally, this distribution is used to derive a c1osedform expression for the messages on the augmented factor graph for online parameter estimation and decoding process at the same time.
引用
收藏
页码：809 / 812
页数：4
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