In this work, an efficient precoding design scheme is proposed for downlink cell-free distributed massive multiple-input multiple-output (DM-MIMO) filter bank multi-carrier (FBMC) systems with asynchronous reception and highly frequency selectivity. The proposed scheme includes a multiple interpolation structure to eliminate the impact of response difference we recently discovered, which has better performance in highly frequency-selective channels. Besides, we also consider the phase shift in asynchronous reception and introduce a phase compensation in the design process. The phase compensation also benefits from the multiple interpolation structure and better adapts to asynchronous reception. Based on the proposed scheme, we theoretically analyze its ergodic achievable rate performance and derive a closed-form expression. Simulation results show that the derived expression can accurately characterize the rate performance, and FBMC with the proposed scheme outperforms orthogonal frequency-division multiplexing (OFDM) in the asynchronous scenario.

翻译：本文提出了一种高效的下行预编码设计方法，适用于异步接收且具有高频率选择性的无蜂窝分布式大规模多输入多输出(DM-MIMO)滤波器组多载波(FBMC)系统。该方案包含一种多重插值结构，用以消除我们近期发现的响应差异影响，在高频率选择性信道中具有更优性能。此外，我们同时考虑了异步接收中的相位偏移，并在设计过程中引入相位补偿机制。该相位补偿也受益于多重插值结构，能更好地适应异步接收场景。基于所提方案，我们从理论上分析了遍历可达速率性能，并推导出闭合表达式。仿真结果表明，推导的表达式能准确表征速率性能，且采用所提方案的FBMC在异步场景中优于正交频分复用(OFDM)。