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This work jointly addresses user scheduling and precoder/combiner design inthe downlink of a wideband millimeter wave (mmWave) communications system. Weconsider Orthogonal Frequency Division Multiplexing (OFDM) modulation toovercome channel frequency selectivity and obtain a number of equivalentnarrowband channels. Hence, the main challenge is that the analog preprocessingnetwork is frequency flat and common to all the users at the transmitter side.Moreover, the effect of the signal bandwidth over the Uniform Linear Array(ULA) steering vectors has to be taken into account to design the hybridprecoders and combiners. The proposed algorithmic solution is based on LinearSuccessive Allocation (LISA), which greedily allocates streams to differentusers and computes the corresponding precoders and combiners. By taking intoaccount the rank limitations imposed by the hardware at transmission andreception, the performance loss in terms of achievable sum rate for the hybridapproach is negligible. Numerical experiments show that the proposed methodexhibits excellent performance with reasonable computational complexity.

Hybrid LISA for Wideband Multiuser Millimeter Wave Communication Systems under Beam Squint