Repeated MCIK-OFDM With Enhanced Transmit Diversity Under CSI Uncertainty
Repeated MCIK-OFDM With Enhanced Transmit Diversity Under CSI Uncertainty
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DOI：
10.1109/twc.2018.2819997
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发表时间：
2018-04
影响因子：
10.4
通讯作者：
Thien Van Luong;Y. Ko;Jinho Choi
中科院分区：
文献类型：
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作者：
Thien Van Luong;Y. Ko;Jinho Choi
本文研究了重复编码多载波索引键控正交频分复用（MCIK-OFDM）的机会，称为重复MCIK-OFDM（ReMO），它可以在相同的频谱效率下提供优于现有方案的上级性能。与经典方案不同，所提出的方案激活子载波的子集，并用相同的$M$ary数据符号来调制它们，而附加信息由活动子载波索引来传达。这种方法不仅提供了频率分集增益的$M$ -ary符号检测，但也改善了索引检测，导致发射分集的显着改善。对于性能分析，我们推导出严格的封闭形式的表达式的符号错误概率和误比特率，在完美和不完美的信道状态信息（CSI）。这些表达式提供了对可实现的性能增益、系统设计以及各种CSI条件的影响的深入了解。仿真结果表明，在不同CSI不确定性下，该方案比现有方案具有更好的上级性能.
This paper investigates the opportunity for a repetition coded multi-carrier index keying—orthogonal frequency division multiplexing (MCIK-OFDM), termed repeated MCIK-OFDM (ReMO), which can provide superior performance over existing schemes at the same spectral efficiency. Unlike the classical scheme, the proposed scheme activates a subset of sub-carriers and modulates them with the same $M$ -ary data symbol, while additional information is conveyed by the active sub-carrier indices. This approach not only provides the frequency diversity gains in the $M$ -ary symbol detection but also improves the index detection, leading to considerable improvement in the transmit diversity. For performance analysis, we derive tight closed-form expressions for the symbol error probability and the bit error rate, under both perfect and imperfect channel state information (CSI). These expressions provide insight into the achievable performance gains, system designs, and impacts of various CSI conditions. Finally, simulation results are given to illustrate the superior performance achieved by our scheme over existing schemes under different CSI uncertainties.