光学学报, 2009, 29 (s2): 63, 网络出版: 2010-01-27   

大气激光通信中的正交空时块码

Orthogonal Space-Time Block Code in Atmosphere Laser Communication
作者单位
西安理工大学自动化与信息工程学院, 陕西 西安 710048
摘要
空时编码不仅能提高系统的传输速率,而且还能有效抵御大气湍流。在建立了大气激光多输入多输出(MIMO)信道的模型之后,提出了一种适合于任意多进制脉冲位置调制(Q-PPM)调制的比特补码正交空时编码(BCOSTBC),并推出了它的最大似然判决准则和误字率公式。最后,利用仿真实验进一步验证了该理论的正确性,并和重复码的性能进行了对比。结果表明,在大气激光通信中,这种码获得了满分集增益,而且还能很好的改善系统性能。当误字率Ps=10-2时,相对于1×1系统而言,采用这种码的2×1和2×2系统的信噪比分别改善了约10 dB和20 dB。虽然BCOSTBC码的误码性能没有重复码好,但是它更容易和其它信道编码级联。当BCOSTBC和RS码级联时,进一步改善了系统性能。
Abstract
Space-time code can not only greatly improve transmit speed rate, but also combat the effect of atmosphere turbulence. Firstly, multiple input multiple output (MIMO) channel model of atmosphere laser communication is proposed in this paper. Secondly, bit complement orthogonal space-time block code (BCOSTBC) is proposed. The maximum likelihood criterion and symbol error probability of the BCOSTBC being fit for Q-ary pulse position modulation (Q-PPM) are analyzed. At last, the feasibility of the technique is proved by the simulation experiment. And the method is compared with the repetition code. It is shown that in atmosphere laser communication this method obtains the full diversity gain, and improves the symbol error probability (SEP) of the system effectively. When the SEP is 10-2, according to the 1×1 system, the SNRs of the 2×1 and 2×2 system are respectively reduced by 10 dB and 20 dB. The SEP of the repetition code is better than BCOSTBC′, but the latter is easier concatenated with channel code than the former. When BCOSTBC is concatenated with RS code, its performance is improve more effectively.

王惠琴, 柯熙政, 赵黎, 吴鹏飞. 大气激光通信中的正交空时块码[J]. 光学学报, 2009, 29(s2): 63. Wang Huiqin, Ke Xizheng, Zhao Li, Wu Pengfei. Orthogonal Space-Time Block Code in Atmosphere Laser Communication[J]. Acta Optica Sinica, 2009, 29(s2): 63.

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