Design of Heterogeneous QoS Guaranteed Superposition Virtual Channel aided MIMO Systems

Superposition virtual channel (SVC) method can enhance spatial reusability and SVC vector changes transmission channel matrix to improve system performance. However, the study of quality of service (QoS) provisioning is still blank in SVC aided multiple-input multiple-output (MIMO) system especially when heterogeneous services are transmitted. We propose the heterogeneous QoS guaranteed (HQG) SVC method to satisfy different delay-QoS requirements of heterogeneous services as well as increase system effective capacity (EC). As EC measures the capacity meeting delay-QoS requirements, we derive EC for the investigated system under Nakagami-m fading channel. Targeting at maximizing EC and obtaining better bit error rate (BER), an optimization problem is established to obtain the optimal HQG SVC vector. In order to simplify the multi-objective problem, we make the magnitudes of EC and BER on the same order through mathematical treatment and design a weighting fitness function of these two metrics. Simulation results show that the HQG SVC method can provide not only a best EC but also a similar BER as SVC method, which indicates that the HQG SVC method can guarantee heterogeneous delay-QoS requirements.