标题： 基于能量检测非相干接收的RIS辅助通信中的最优多电平ASK调制 显示英文标题

标题： Optimal Multi-Level ASK Modulations for RIS-Assisted Communications with Energy-Based Noncoherent Reception

摘要： 本文研究了在可重构智能表面(RIS)辅助的非相干单输入单输出(SISO)无线通信系统中，单边和双边幅度移位键控(ASK)调制的性能。 基于接收到的符号能量和数据传输的调制方案选择，提出了新颖的非相干接收机结构。 系统的性能通过符号错误率(SER)进行评估，并提出了一种优化框架，以确定最有效的单边和双边ASK，从而在遵守平均发射功率约束的情况下最小化SER。 探讨了两种基于无线信道统计特性可用性的场景：a) 收发器对具有完整的信道统计知识，b) 两端节点掌握信道增益统计信息至其四阶矩，为这两种情况开发了新的算法以获得最优的ASK。 提供了广泛的数值评估，展示了存在一个信噪比(SNR)阈值，超过该阈值时最优ASK优于传统的等间距ASK。 评估了SER性能和SNR阈值与各种系统参数的依赖关系，为具有多电平ASK调制的RIS辅助非相干无线通信系统提供了设计指南。 显示英文摘要

摘要： This paper investigates the performance of one- and two-sided amplitude shift keying (ASK) modulations in noncoherent single-input single-output (SISO) wireless communication systems assisted by a reconfigurable intelligent surface (RIS). Novel noncoherent receiver structures are proposed based on the energy of the received symbol and the choice of the modulation scheme for data transmission. The system's performance is assessed in terms of the symbol error rate (SER) and an optimization framework is proposed to determine the most effective one- and two-sided ASKs to minimize the SER, while adhering to average a transmit power constraint. Two scenarios based on the availability of the statistical characteristics of the wireless channel are explored: a) the transceiver pair has complete knowledge of the channel statistics, and b) both end nodes possess knowledge of the statistics of the channel gain up to its fourth moment, and novel algorithms are developed to obtain optimal ASKs for both of them. Extensive numerical evaluations are presented showcasing that there exists a threshold signal-to-noise ratio (SNR) above which the optimal ASKs outperform the traditional equispaced ASKs. The dependencies of the SER performance and the SNR threshold on various system parameters are assessed, providing design guidelines for RIS-assisted noncoherent wireless communication systems with multi-level ASK modulations.