Publication:
Non-Coherent Multiuser Massive MIMO-OFDM with Differential Modulation

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2019-05-20
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IEEE
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Abstract
Massive multiple-input multiple-output (MIMO) and orthogonal frequency division multiplexing (OFDM) are wireless technologies adopted by the Fifth Generation (5G) of mobile communications. The channel estimation and pre/postequalization processes in coherent detection schemes for massive MIMO-OFDM are a challenging task, where several issues are faced, such as pilot contamination, channel calibration, matrix inversions, among others. Moreover, they increase the energy consumption and latency of the system. A non-coherent technique relying on DPSK constellation has been proposed for a singlecarrier scheme, assuming flat-fading. In our paper, we extend this technique to be combined with OFDM, where the channel is doubly dispersive (time and frequency). We will show that the differential modulation can be performed either in the time or frequency domain, where the latter suffers from an additional phase rotation, which should be estimated and compensated. We provide the analytical expression of the signal-to-interferenceand-noise ratio (SINR) for both cases, and we show numerical results in order to verify our analysis.
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Proceedings of: ICC 2019 - 2019 IEEE International Conference on Communications (ICC), 20-24 may, 2019, Shanghai.
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OFDM, Interference, Signal to noise ratio, Receivers, Channel estimation, Differential phase shift keying, Frequency-domain analysis
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ICC 2019 - 2019 IEEE International Conference on Communications (ICC), 20-24 may, 2019, Shanghai.