光无线通信中数字脉冲间隔调制的有序序列检测和屏障信号设计
Ordered Sequence Detection and Barrier Signal Design for Digital Pulse Interval Modulation in Optical Wireless Communications
摘要：
提出了一种用于无线通信中数字脉冲间隔调制（DPIM）的有序序列检测（OSD）方法。利用DPIM序列的稀疏性，OSD表现出与最佳最大似然序列检测（MLSD）相当的性能，具有更低的复杂度。与广泛采用的逐样本最优门限检测（OTD）相比，它通过抑制错误传播而显著改善了误比特率（BER）性能。此外，本文提出了一种屏障信号辅助的数字脉冲间隔调制（BDPIM），其中每个$K$符号的最后一个被分配有更多的功率作为插入的屏障信号。带OSD的BDPIM（BDPIM-OSD）可以限制相邻栅栏之间的误差传播。为了减少存储延迟时，使用OSD检测极大的数据包，我们提出了BDPIM与OTD和OSD（BDPIM-OTD-OSD）的组合，其中长序列被切成碎片，分别检测。分析了DPIM-OTD、DPIM-OSD、BDPIM-OSD和BDPIM-OTD-OSD的平均误码性能的近似上界。仿真结果证实了我们的分析。最佳参数设置也研究了在未编码和编码系统的仿真。仿真结果表明，所提出的OSD和BDPIM带来了显着的改善，在未编码和编码系统在各种信道。
英文摘要：
This paper proposes an ordered sequence detection (OSD) for digital pulse interval modulation (DPIM) in optical wireless communications. Leveraging the sparsity of DPIM sequences, OSD shows comparable performance to the optimal maximum likelihood sequence detection (MLSD) with much lower complexity. Compared with the widely adopted sample-by-sample optimal threshold detection (OTD), it considerably improves the bit error rate (BER) performance by mitigating error propagation. Moreover, this paper proposes a barrier signal-aided digital pulse interval modulation (BDPIM), where the last of every $K$ symbols is allocated with more power as an inserted barrier signal. BDPIM with OSD (BDPIM-OSD) can limit the error propagation between two adjacent barriers. To reduce the storing delay when using OSD to detect extremely large packets, we propose BDPIM with a combination of OTD and OSD (BDPIM-OTD-OSD), within which long sequences are cut into pieces and separately detected. Approximate upper bounds of the average BER performance of DPIM-OTD, DPIM-OSD, BDPIM-OSD and BDPIM-OTD-OSD are analyzed. Simulations are conducted to corroborate our analysis. Optimal parameter settings are also investigated in uncoded and coded systems by simulations. Simulation results show that the proposed OSD and BDPIM bring significant improvement in uncoded and coded systems over various channels.
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