In this paper, we address a joint design of symbol level beam selection and precoding in the multi-user downlink beamspace multiple-input single-output (MISO) system. Unlike the general concept of eliminating or avoiding inter-user interference, the symbol level design aims to exploit the constructive interference at symbol level among the multiple users. To optimize the constructive interference while ensuring the signal interference noise ratio (SINR), a cardinality constrained minimum mean square error (MMSE) problem with per-beam power limitation is formulated. To resolve this non-convex and non-smooth problem, we propose a penalty proximal alternating linearized minimization based algorithm, in which a sequence of penalty sub-problems are solved by iteratively executing two projections: selective constructive signal region projection and sparse beam selection projection. From the extensive simulation results, the convergence of the proposed algorithm and its effectiveness are demonstrated.
Symbol Level Beam Selection and Precoding in mm-wave Beamspace MU-MISO Systems
2021-04-01
1695230 byte
Conference paper
Electronic Resource
English