This letter presents and analyzes orthogonal frequency-division multiplexing (OFDM)-based multi-carrier transmission for cell-free massive multi-input multi-output (CFmMIMO) over frequency-selective fading channels. Frequency-domain conjugate beamforming, pilot assignment, and user-specific resource allocation are proposed. CFmMIMO-OFDM is scalable to serve a massive number of users and is flexible to offer diverse data rates for heterogeneous applications.

翻译：本信介绍并分析了无细胞、大规模多投入多产出多产出多产出多载传输(CFMMIMO)在频度选择性衰减频道上的垂直频率分流多路传输(OFDM),提出了频域组合、试点分配和用户专用资源分配建议。 CFMMIMO-OFDM可以向大量用户推广,灵活地提供多种不同应用的不同数据率。