Shannon capacities and error-correction codes for optical atmospheric turbulent channels

被引：112

作者：

Anguita, JA ^{[1
]}

Djordjevic, IB ^{[1
]}

Neifeld, MA ^{[1
]}

Vasic, BV ^{[1
]}

机构：

[1] Univ Arizona, Dept Elect & Comp Engn, Tucson, AZ 85721 USA

来源：

JOURNAL OF OPTICAL NETWORKING | 2005年 / 4卷 / 09期

关键词：

D O I：

10.1364/JON.4.000586

中图分类号：

TP3 [计算技术、计算机技术];

学科分类号：

0812 ;

摘要：

The propagation of an ON-OFF keying modulated optical signal through an optical atmospheric turbulent channel is considered. The intensity fluctuations of the signal observed at the receiver are modeled using a gamma-gamma distribution. The capacity of this channel is determined for a wide range of turbulence conditions. For a zero inner scale, the capacity decreases monotonically as the turbulence strengthens. For non-zero inner scale, the capacity is not monotonic with turbulence strength. Two error-correction schemes, based on low-density parity-check (LDPC) codes, are investigated as a means to improve the bit-error rate (BER) performance of the system. Very large coding gains-ranging from 5.5 to 14 dB, depending on the turbulence conditions-are obtained by these LDPC codes compared with Reed-Solomon error-correction codes of similar rates and lengths. (c) 2005 Optical Society of America.

引用

页码：586 / 601

页数：16

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