Hybrid Precoding for Optoelectronic Base Station

An optoelectronic base station (OE-BS) architecture is proposed to mitigate the performance loss and computational overhead caused by the unimodular constraint in conventional analog precoding, wherein the phase-shifter network is replaced with an optical network. Optical components provide joint amplitude-phase control in the analog domain, eliminating the unimodular constraint and enhancing precoding flexibility. Based on the proposed OE-BS architecture, a user-selective hybrid precoding scheme is devised for wideband multi-user systems, wherein the analog precoder and power allocation are jointly optimized. Simulation results demonstrate the superior performance of the proposed OE-BS schemes.