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FFT-Assisted Coded Modem for Intensity-Modulated Signals Under Peak and Average Power Constraints
IEEE Transactions on Communications ( IF 8.3 ) Pub Date : 2020-01-01 , DOI: 10.1109/tcomm.2019.2952586
Ru-Han Chen , Jian Zhang , Yan-Yu Zhang

We consider an intensity-modulated (IM) communication system in the presence of Gaussian noise. To improve the reliability of such a system, a space-only constellation-optimal structure was proposed by Zhang under a peak and an average power constraint. However, how to utilize time resource to design signals has been an unsolved problem. In this paper, we design a complexity-efficient coded modem for IM signals under a peak- and an average-power constraint in finite-blocklength regimes. The proposed modem consists of a lattice-based multidimensional constellation bounded by the optimal shaping region, decomposable constellation mapping and demapping based on the fast Fourier transform (FFT), and a fast demodulator with near maximum-likelihood performance. To the authors’ best knowledge, for the first time, the FFT and the inverse FFT (IFFT) algorithms are used for constellation mapping to reduce the involved complexity. Both theoretical analysis and Monte Carlo simulation results show that our proposed modem has significant signal-to-noise ratio gains and can support flexible-rate transmission compared to the one-dimensional optimal constellation with Gray labeling.

中文翻译:

用于峰值和平均功率约束下的强度调制信号的 FFT 辅助编码调制解调器

我们考虑存在高斯噪声的强度调制 (IM) 通信系统。为了提高这种系统的可靠性,张在峰值和平均功率约束下提出了一种仅空间星座优化结构。然而,如何利用时间资源来设计信号一直是一个悬而未决的问题。在本文中,我们设计了一种复杂度高效的编码调制解调器,用于有限块长度机制中峰值和平均功率约束下的 IM 信号。所提出的调制解调器由以最佳整形区域为界的基于格的多维星座、基于快速傅立叶变换 (FFT) 的可分解星座映射和解映射以及具有接近最大似然性能的快速解调器组成。据作者所知,这是第一次,使用 FFT 和逆 FFT (IFFT) 算法进行星座映射以降低所涉及的复杂度。理论分析和蒙特卡罗仿真结果均表明,与具有格雷标记的一维最优星座相比,我们提出的调制解调器具有显着的信噪比增益,并且可以支持灵活速率传输。
更新日期:2020-01-01
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