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arXiv 1111.3820cs.ITmath.IT
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卷积码Viterbi译码的精确误比特率的封闭表达式

A Closed Form Expression for the Exact Bit Error Probability for Viterbi Decoding of Convolutional Codes

Irina E. Bocharova, Florian Hug, Rolf Johannesson, Boris D. Kudryashov

摘要:

在1995年,Best等人公布了当用于在二进制对称信道上通信时,用于具有生成矩阵G(D)=(11 +D)的速率R=1/2、存储器m=1(2状态)卷积编码器的维特比解码的精确比特错误概率的公式。他们的公式后来被Lentmaier等人推广到速率R=1/2,记忆m=2(4状态)卷积编码器,生成矩阵G(D)=(1+D^2 1+D+D^2)。本文描述了一种不同的方法来推导精确的误比特概率。一个一般的递归矩阵方程,连接的平均信息重量在当前和以前的状态的一个网格部分的维特比解码器,推导和解决。该矩阵方程的一般解产生精确比特错误概率的封闭形式表达式。作为特殊情况,得到了Best等人对2状态编码器和Lentmaier等人对4状态编码器的表达式。本文推导出的封闭形式的表达式进行评估的各种实现的编码器,包括速率R=1/2和R=2/3编码器,多达16个国家。此外,它示出,它是直接的,以扩展的方法在量化的加性高斯白噪声信道上的通信。

英文摘要:

In 1995, Best et al. published a formula for the exact bit error probability for Viterbi decoding of the rate R=1/2, memory m=1 (2-state) convolutional encoder with generator matrix G(D)=(1 1+D) when used to communicate over the binary symmetric channel. Their formula was later extended to the rate R=1/2, memory m=2 (4-state) convolutional encoder with generator matrix G(D)=(1+D^2 1+D+D^2) by Lentmaier et al. In this paper, a different approach to derive the exact bit error probability is described. A general recurrent matrix equation, connecting the average information weight at the current and previous states of a trellis section of the Viterbi decoder, is derived and solved. The general solution of this matrix equation yields a closed form expression for the exact bit error probability. As special cases, the expressions obtained by Best et al. for the 2-state encoder and by Lentmaier et al. for a 4-state encoder are obtained. The closed form expression derived in this paper is evaluated for various realizations of encoders, including rate R=1/2 and R=2/3 encoders, of as many as 16 states. Moreover, it is shown that it is straightforward to extend the approach to communication over the quantized additive white Gaussian noise channel.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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