Differential Subcarrier Index Modulation
Differential Subcarrier Index Modulation
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DOI：
10.1109/tvt.2018.2837691
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发表时间：
2018-05
影响因子：
6.8
通讯作者：
S. Althunibat;R. Mesleh;E. Başar
中科院分区：
文献类型：
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作者：
S. Althunibat;R. Mesleh;E. Başar
正交频分复用（OFDM）-子载波索引调制（SIM）系统的主要挑战之一是在接收器侧获取信道状态信息需要大量资源。本文提出了一种差分子载波索引调制（DSIM）方案，该方案完全避免了接收器侧对任何信道知识的需要。因此，在信道估计过程中花费的时间和能量资源是可感知的。在DSIM中，传输块的一部分通过普通信号调制进行调制，而第二部分通过选择活动子载波的特定排列来传输。传输的信号被设计为便于接收器侧的差分解调。对DSIM的平均误码概率进行推导，得到上界表达式。通过蒙特卡罗模拟结果验证了推导的理论表达式。报告结果表明，差分解调使相干 SIM 的误码性能降低了近 4 dB 的信噪比。
One of the main challenges in orthogonal frequency division multiplexing (OFDM)–subcarrier index modulation (SIM) systems is the huge amount of resources required to obtain channel state information at the receiver side. In this paper, a differential subcarrier index modulation (DSIM) scheme is proposed, which entirely avoids the need for any channel knowledge at the receiver side. As such, time and energy resources spent in the channel estimation process are perceived. In DSIM, part of the transmitted block is modulated through ordinary signal modulation, whereas the second part is transmitted by selecting a specific permutation of the active subcarriers. The transmitted signals are designed to facilitate differential demodulation at the receiver side. A derivation is conducted for the average bit error probability of DSIM and an upper bound expression is obtained. Derived theoretical expression is substantiated through Monte Carlo simulation results. Reported results reveal that differential demodulation degrades the error performance of coherent SIM by nearly 4 dB in signal-to-noise-ratio.