Zhang Yue, Wang Huiqin, Ma Xuemei, Zhao Li, Mao Yicong
Appl Opt. 2021 Apr 20;60(12):3501-3509. doi: 10.1364/AO.419484.
In this paper, an optical space-time shift-keying (OSTSK) scheme based on the space-time dispersion matrix block of orthogonal design and laser selection technology is proposed to improve the transmission bits per symbol (TBS) and bit error rate (BER) performance of the traditional optical space shift keying (OSSK). The average BER of OSTSK is investigated over the Gamma-Gamma channel and simulated using the Monte Carlo method. The results show that the proposed scheme has the highest TBS and best BER performance compared with OSSK and optical generalized space shift keying. In addition, we propose a threshold judgment orthogonal matching pursuit (TJ-OMP)-decoding algorithm near-optimal detector for the OSTSK scheme to reduce the computational complexity of the system. For the OSTSK system with =4 and =4, when the reasonable threshold is selected as =1.5, the computational complexity of OSTSK-(TJ-OMP) is 74.3% lower than that of the OSTSK-maximum likelihood sequence detection (OSTSK-MLSD), while the signal-to-noise ratio of the OSTSK-(TJ-OMP) decreases by about 1.5 dB at =1×10.
本文提出了一种基于正交设计的空时色散矩阵块和激光选择技术的光空时移键控（OSTSK）方案，以提高传统光空移键控（OSSK）的每符号传输比特数（TBS）和误码率（BER）性能。在伽马-伽马信道上研究了OSTSK的平均误码率，并使用蒙特卡罗方法进行了仿真。结果表明，与OSSK和光广义空移键控相比，该方案具有最高的TBS和最佳的BER性能。此外，我们为OSTSK方案提出了一种阈值判决正交匹配追踪（TJ-OMP）解码算法的近最优检测器，以降低系统的计算复杂度。对于(=4)和(=4)的OSTSK系统，当合理的阈值选为(=1.5)时，OSTSK-（TJ-OMP）的计算复杂度比OSTSK-最大似然序列检测（OSTSK-MLSD）低74.3%，而在(=1×10)时，OSTSK-（TJ-OMP）的信噪比下降约1.5 dB。
