When cell-free massive MIMO meets OTFS modulation: the downlink case

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Abstract

We provide a performance evaluation of orthogonal time frequency space (OTFS) modulation in cell-free massive MIMO (multiple-input multiple-output) systems. By leveraging the inherent sparsity of the delay-Doppler (DD) representation of time-varying channels, we apply the embedded pilot-aided channel estimation method with reduced guard intervals and derive the minimum mean-square error estimate of the channel gains from received uplink pilots at the access points (APs). Each AP applies conjugate beamforming to transmit data to the users. We derive a closed-form expression for the individual user downlink throughput as a function of the numbers of APs, users and DD channel estimate parameters. We compare the OTFS performance with that of orthogonal frequency division multiplexing (OFDM) at high-mobility conditions. Our findings reveal that with uncorrelated shadowing, cell-free massive MIMO with OTFS modulation achieves up to 35% gain in 95%-likely per-user throughput, compared with the OFDM counterpart. Finally, the increase in the per user throughput is more pronounced at the median rates over the correlated shadowing scenarios.
Original languageEnglish
Title of host publication2022 IEEE International Conference on Communications (ICC)
PublisherInstitute of Electrical and Electronics Engineers Inc.
DOIs
Publication statusPublished - 11 Aug 2022

Publication series

NameIEEE International Conference on Communications
PublisherIEEE
ISSN (Electronic)1938-1883

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