The Gaussian free space optical MIMO channel with Q-ary pulse position modulation

被引：65

作者：

Letzepis, Nick ^{[1
]}

Holland, Ian ^{[1
]}

Cowley, William ^{[1
]}

机构：

[1] Univ S Australia, Inst Telecommun Res, Adelaide, SA 5001, Australia

来源：

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS | 2008年 / 7卷 / 05期

关键词：

optical communication; random media; MIMO systems; pulse position modulation; Gaussian channels; information theory;

D O I：

10.1109/TWC.2008.061002

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The main drawback in communicating via the free space optical (FSO) channel is the detrimental effect the atmosphere has on a propagating laser beam. Atmospheric turbulence causes random fluctuations in the irradiance of the received optical laser beam, commonly referred to as scintillation. This paper investigates the use of multiple lasers and multiple apertures to mitigate the effects of scintillation. In particular, the FSO multiple-input multiple-output (MIMO) channel with Q-ary pulse position modulation (QPPM) and transmit repetition under the assumption of non-ideal photodetection is analyzed in terms of its uncoded bit error rate (BER) and ergodic channel capacity. This analysis is based, in part, on the use of irradiance fluctuation samples that were obtained from a laser range experiment that was conducted in the presence of moderate turbulence conditions. Expressions are derived for the log-likelihood ratio (LLR) of a received bit, uncoded BER and ergodic capacity. Using these results it is shown that large gains are possible with the use of MIMO combined with strong coding techniques.

引用

页码：1744 / 1753

页数：10

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