发表机构
Beijing Institute of Technology; University of Surrey; National Institute of Telecommunications（北京理工大学; 萨里大学; 国家电信研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出FTN-WAFT传输方案及PA-IC-MLMP接收机，通过重构和消除PA非线性失真，在非线性PA约束下提升BER和有效吞吐量，同时保持低复杂度。
AI 中文摘要
本文提出了一种超奈奎斯特（FTN）加权仿射傅里叶变换（WAFT）传输方案，称为FTN-WAFT，该方案结合了WAFT的峰均功率比（PAPR）灵活性与FTN时间压缩，以提高高机动性信道下的频谱效率和功率放大器（PA）效率。然而，在降低输入回退（IBO）条件下运行PA不可避免地引入非线性失真，该失真进一步与FTN引起的符号间干扰（FTN-ISI）和双选择性信道色散耦合。为解决这一实际损伤，提出了一种由PA干扰消除（PA-IC）辅助的多层消息传递（MLMP）接收机，称为PA-IC-MLMP。所提出的接收机从软符号估计中重构主要PA失真，消除信道传播的非线性干扰，并在WAFT、FTN、信道和星座层上执行MLMP。仿真结果表明，所提出的接收机在非线性PA约束下提高了误码率（BER）和有效吞吐量，同时保持了低复杂度。
英文摘要
This letter proposes a faster-than-Nyquist (FTN) weighted affine Fourier transform (WAFT) transmission scheme, termed FTN-WAFT, which combines the peak-to-average power ratio (PAPR) flexibility of WAFT with FTN time compression to improve spectral efficiency and power amplifier (PA) efficiency over high-mobility channels. However, operating the PA at a reduced input back-off (IBO) inevitably introduces nonlinear distortion, which further couples with FTN-induced inter-symbol interference (FTN-ISI) and doubly selective channel dispersion. To address this practical impairment, a multilayer message-passing (MLMP) receiver aided by PA interference cancellation (PA-IC), termed PA-IC-MLMP, is proposed. The proposed receiver reconstructs the dominant PA distortion from soft symbol estimates, cancels the channel-propagated nonlinear interference, and performs MLMP over the WAFT, FTN, channel, and constellation layers. Simulation results show that the proposed receiver improves the bit error rate (BER) and effective throughput under nonlinear PA constraints while maintaining low complexity.
