关于OFDM-IM系统的SLM方案中的相位序列和置换函数
On the Phase Sequences and Permutation Functions in the SLM Scheme for OFDM-IM Systems
摘要：
在具有索引调制的正交频分复用（OFDM-IM）中，活动子载波可以通过调制符号以及它们的索引来传送信息比特。OFDM-IM以其高能效的特点吸引了研究者的广泛关注。然而，OFDM-IM系统继承了传统OFDM信号的峰值平均功率比（PAPR）较大的缺点，而选择映射（SLM）技术是一种无失真、具有良好PAPR抑制能力、易于在OFDM-IM系统中应用的PAPR抑制技术。在用于OFDM-IM系统的SLM中，在应用快速傅立叶逆变换（IFFT）之前，相位序列在频域中旋转OFDM-IM块。此外，在SLM中相位序列的乘法之前，可以容易地引入频域中的置换。本文研究了OFDM-IM系统中SLM方案中的相位序列集（PSS）和置换函数;首先，分析了置换效率与有效子载波数的关系。其次，推导了PSS和置换函数的最优条件，并通过仿真进行了验证。
英文摘要：
In orthogonal frequency division multiplexing with index modulation (OFDM-IM), the active subcarriers can convey information bits by modulated symbols as well as their indices. OFDM-IM has attracted a great deal of attention from researchers by virtue of high energy efficiency. Unfortunately, OFDM-IM has inherited large peak-to-average power ratio (PAPR) of the classical OFDM signal, but there are few works dealing with it. Selected mapping (SLM) is a promising PAPR reduction technique that is distortionless, has good PAPR reducing capability, and can be easily adapted in OFDM-IM systems. In SLM for OFDM-IM systems, the phase sequences rotate the OFDM-IM block in the frequency domain before the inverse fast Fourier transform (IFFT) is applied. Also, permutation in the frequency domain can be easily introduced before multiplication of phase sequences in SLM. In this paper, we investigate the phase sequence set (PSS) and permutation functions in the SLM scheme for OFDM-IM systems; First, the efficiency of the permutation is analyzed as a function of the number of active subcarriers. Second, the optimal conditions for the PSS and permutation functions are derived, which is verified through simulations.
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