论文标题
在OFDM-IM系统的SLM方案中的相位序列和置换函数上
On the Phase Sequences and Permutation Functions in the SLM Scheme for OFDM-IM Systems
论文作者
论文摘要
在用索引调制（OFDM-IM）的正交频施加多路复用中，主动子载体可以通过调制符号及其索引传达信息位。 OFDM-IM由于高能源效率而引起了研究人员的广泛关注。不幸的是，OFDM-IM继承了经典OFDM信号的大峰值功率比（PAPR），但是处理它的作品很少。选定的映射（SLM）是一种有前途的PAPR还原技术，它是无失真的，具有良好的PAPR降低功能，并且可以轻松地在OFDM-IM系统中进行调整。在用于OFDM-IM系统的SLM中，相位序列在应用逆快速傅立叶变换（IFFT）之前旋转频域中的OFDM-IM块。同样，在SLM中相位序列乘法之前，可以轻松地引入频域中的排列。在本文中，我们研究了OFDM-IM系统的SLM方案中的相位序列集（PSS）和置换函数；首先，分析排列的效率是活动子载体数量的函数。其次，得出了PSS和置换函数的最佳条件，这是通过模拟验证的。
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.
