CAPACITY, CUTOFF RATE, AND CODING FOR A DIRECT-DETECTION OPTICAL CHANNEL
CAPACITY, CUTOFF RATE, AND CODING FOR A DIRECT-DETECTION OPTICAL CHANNEL
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DOI：
10.1109/tcom.1981.1094916
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发表时间：
1981-01-01
影响因子：
8.3
通讯作者：
MASSEY, JL
中科院分区：
文献类型：
--
作者：
MASSEY, JL
结果表明，当Pierce的2L位脉冲位置调制方案应用于自噪声限制的直接检测光通信信道时，将产生一个2L进制擦除信道，它等价于“完全相关”的二进制擦除信道的并行组合。全通道的容量是组成通道的容量之和，但全通道的截止速率被示出为远小于截止速率之和。的截止率的解释给出了建议的复杂性的优势，分别编码的分量通道。它表明，如果短约束长度卷积码与Viterbi解码器上的分量信道使用，那么性能和复杂度毫不逊色于由McEliece提出的里德-所罗门编码系统的全信道。详细探讨了卷积码系统的这种出乎意料的优良性能的原因，以及信道结构的各个方面。
It is shown that When Pierce's pulse-position modulation scheme with 2Lpositions is used on a self-noise-limited directdetection optical communication channel, there results a 2L-ary erasure channel that is equivalent to the parallel combination of"completely correlated" binary erasure channels. The capacity of the full channel is the sum of the capacities of the component channels, but the cutoff rate of the full channel is shown to be much smaller than the sum of the cutoff rates. An interpretation of the cutoff rate is given that suggests a complexity advantage in coding separately on the component channels. It is shown that if short-constraint length convolutional codes with Viterbi decoders are used on the component channels, then the performance and complexity compare favorably with the Reed-Solomon coding system proposed by McEliece for the full channel. The reasons for this unexpectedly fine performance by the convolutional code system are explored in detail, as are various facets of the channel structure.