2017 年 7 月 Journal on Communications July 2017
2017153-1
第 38 卷第 7 期 通 信 学 报 Vol.38
No.7
户外无线光通信中湍流信道下的分组马尔可夫叠加传输研究
朱锦顺
1
,马啸
2,3
(1. 中山大学电子与信息工程学院,广东 广州 510006;2. 中山大学数据科学与计算机学院,广东 广州 510006;
3. 中山大学广东省信息安全重点实验室,广东 广州 510006)
摘 要:基于精灵辅助等效系统,分析了分组马尔可夫叠加传输系统的性能下界,推导了精灵辅助系统误比特率
的联合界。该联合界可用于解决误比特率(BER)很低时蒙特卡洛仿真难以获知系统错误性能的问题。仿真结果
表明,在不同强度的湍流条件下,分组马尔可夫叠加传输系统在低误比特率区域的错误性能与精灵辅助下界贴合。
精灵辅助等效系统的联合界与其仿真结果也贴合。在 BER=10
-5
时,记忆长度为 2 的分组马尔可夫叠加传输系统
的性能与香农限的距离在 1 dB 以内。
关键词:无线光通信;湍流效应;分组马尔可夫叠加传输;联合界;Gamma-Gamma 信道模型
中图分类号:TN929.12 文献标识码:A
Block Markov superposition transmission over turbulence
channels in outdoor optical wireless communication
ZHU Jin-shun
1
, MA Xiao
2,3
(1. School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510006, China;
2. School of Data and Computer Science, Sun Yat-sen University, Guangzhou 510006, China;
3. Guangdong Key Laboratory of Information Security Technology, Sun Yat-sen University, Guangzhou 510006, China)
Abstract: Based on the equivalent genie-aided system, the bit-error rate of the block Markov superposition transmission
system was analyzed and the union bound of the bit-error rate of the genie-aided system was derived. When the bit-error
rate was extremely low at which the Monte Carlo simulation was time-consuming, the union bound could be adopted to
evaluate the performance of the block Markov superposition transmission system. Simulations under turbulence condi-
tions from weak to strong are performed which show that, in the low bit-error rate region, performance of the block Mar-
kov superposition transmission system matches well with the lower bound. It is also illustrated that the derived union
bound matches well with Monte Carlo simulation result. At the BER of 10
-5
, block Markov superposition transmission
system with transmission memory 2 performs within 1 dB away from the Shannon limit.
Key words: optical wireless communication, turbulence effect, block Markov superposition transmission, union bound,
Gamma-Gamma channel model
1 引言
无线光通信(OWC, optical wireless communi-
cation)拥有高通信容量、高安全性、低能耗以及
频谱资源免授权等诸多优点,逐渐成为无线通信方
面的研究热点
[1]
。户外 OWC 通常采用基于激光二
极管(laser diode)的自由空间光(FSO, free space
optical)系 统 ,商 用 FSO 系统已实现 10 Gbit/s 的传
输速率,最近实验验证 FSO 系统可实现接近光纤的
传输速率
[2,3]
。户 外 OWC 也可采用基于发光二极管
收稿日期:2016-10-28;修回日期:2017-04-21
基金项目:国家自然科学基金重大研究计划培育基金资助项目(No.91438101);广东省自然科学基金重大基础研究培育基金
资助项目(No.2016A030308008)
Foundation Items: The Major Research Plan of the National Natural Science Foundation of China (No. 91438101), The Basic Re-
search Project of The Natural Science Foundation of Guangdong (No. 2016A030308008)
doi:10.11959/j.issn.1000-436x.2017153