Error Probability Analysis for Rectangular Differential OFDM With Index Modulation Over Dispersive Channels
Error Probability Analysis for Rectangular Differential OFDM With Index Modulation Over Dispersive Channels
复制标题
色散信道上索引调制矩形差分 OFDM 的错误概率分析
DOI：
10.1109/lwc.2021.3117988
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发表时间：
2021
影响因子：
6.3
通讯作者：
Tao Jiang
中科院分区：
文献类型：
--
作者：
Lixia Xiao;Guanghua Liu;P. Xiao;Tao Jiang
在这封信中，提出了一种用于色散信道的新型遗忘因子辅助矩形差分（RD）正交频分复用（IM）和索引调制（IM），它融合了RD编码的概念，以在缺乏信道状态信息（CSI）的情况下利用OFDM-IM的优点。更具体地说， <inline-formula> <tex-math notation="LaTeX">${N}$ </tex-math></inline-formula> 子载波被划分为 <inline-formula> <tex-math notation="LaTeX">${G}$ </tex-math></inline-formula> 子块以进行 IM 映射。通过在两个相邻子块期间采用RD编码，可以在接收器处执行没有CSI的非相干检测。为了进一步提高性能，在接收器处利用了一种新颖的遗忘因子，可以通过封闭形式对其进行优化，而无需额外的复杂性。基于导出的遗忘因子，导出了所提出的 RD-OFDM-IM 方案的平均误码概率（ABEP）的上限，并通过仿真结果进行了验证。理论和仿真结果均表明，所提出的 RD-OFDM-IM 方案能够比传统的差分 OFDM (D-OFDM) 方案提供可观的性能增益。
In this letter, a novel forgetting factor aided rectangular differential (RD) orthogonal frequency division multiplexing (OFDM) with index modulation (IM) is proposed for dispersive channels, which amalgamates the concept of RD coding for exploiting the benefits of OFDM-IM with the absence of channel state information (CSI). To be more specific, <inline-formula> <tex-math notation="LaTeX">${N}$ </tex-math></inline-formula> subcarriers are partitioned into <inline-formula> <tex-math notation="LaTeX">${G}$ </tex-math></inline-formula> subblocks for IM mapping. By employing RD coding during two adjacent subblocks, non-coherent detection without CSI can be carried out at the receiver. To further improve the performance, a novel forgetting factor is exploited at the receiver, which can be optimized via a closed form without extra complexity. Based on the derived forgetting factor, the upper bound of the average bit error probability (ABEP) of the proposed RD-OFDM-IM scheme is derived and is validated by the simulation results. Both the theoretical and simulation results indicate that the proposed RD-OFDM-IM scheme is capable of providing a considerable performance gain over its conventional differential OFDM (D-OFDM) counterpart.