This paper studies the error rate performance and low-complexity receiver design for zero-padded affine frequency division multiplexing (ZP-AFDM) systems. By exploiting the unique ZP-aided lower triangular structure of the time domain (TD) channel matrix, we propose {a novel low-complexity} minimum mean square error (MMSE) detector and {a} maximum ratio combining-based TD (MRC-TD) detector. Furthermore, the theoretical bit error rate (BER) {performance} of both MMSE and maximum likelihood detectors {is} analyzed. Simulation results demonstrate {that} the proposed detectors can achieve identical BER performance to that of {the conventional MMSE detector based on matrix inversion} while {enjoying significantly reduced complexity.}

翻译：本文研究了零填充仿射频分复用（ZP-AFDM）系统的误码率性能及低复杂度接收机设计。通过利用时域信道矩阵独特的零填充辅助下三角结构，我们提出了一种新颖的低复杂度最小均方误差（MMSE）检测器以及一种基于最大比合并的时域（MRC-TD）检测器。此外，本文从理论上分析了MMSE检测器与最大似然检测器的误码率性能。仿真结果表明，所提出的检测器在获得与传统基于矩阵求逆的MMSE检测器相同误码率性能的同时，显著降低了计算复杂度。