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 the 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）系统的误码率性能与低复杂度接收机设计。通过利用时域（TD）信道矩阵独特的零填充辅助下三角结构，我们提出了一种新型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。进一步地，本文分析了MMSE与最大似然检测器的理论误码率（BER）性能。仿真结果表明，所提检测器在实现与传统基于矩阵求逆的MMSE检测器相同BER性能的同时，显著降低了计算复杂度。