QoS-guaranteed downlink transmission optimization for multi-service distributed antenna system

To utilize wireless resources more efficiently and fulfill the requirements of future wireless communications, the scheme of quality-of-service (QoS) guaranteed downlink transmission optimization for multi-service distributed antenna system (DAS) is investigated. The design of the scheme involves balancing a number of conflicting requirements, including QoS provision, throughput maximization, and low system cost. A novel uni-access scheme combined with transmit beamforming algorithm is proposed to maximize DAS downlink throughput while guaranteeing the QoS requirements of multi-service. The optimization of the scheme is proved analytically. Furthermore, by taking system cost into account, the cost-effective solution of our scheme is proposed through simulation efforts. Simulation results also demonstrate effectiveness of our beamforming scheme, in comparison with previously proposed equal power per antenna transmission combined with MRC combining