Coordinated Multipoint Transmission with Limited Backhaul Data Transfer

摘要: When the joint processing technique is applied in coordinated multipoint (CoMP) downlink transmission, user data for each mobile station needs to be shared among multiple base stations (BSs) via backhaul. If number of users large, this exchange can lead a huge backhaul signaling overhead. In paper, we consider multi-cell CoMP network with multi-antenna BSs and single antenna users. The problem that involves design transmit beamformers allocation at minimize transfer addressed, which subject given quality-of-service per-BS power constraints. We show cast into an l0-norm minimization problem, NP-hard. Inspired by recent results compressive sensing, propose two algorithms tackle it. first algorithm based on reweighted l1-norm minimization, solves series convex problems. second algorithm, solve l2-norm relaxation clustering beamforming then iteratively remove links correspond smallest power. enjoys faster solution speed also implemented semi-distributed manner under certain assumptions. Simulations both significantly reduce