Multi-antenna Based Transmission Mechanism Design For Multi-user Wireless Communication

With the continuous development of wireless communication system,the number of user data service increases exponentially,and the requirements on system performance parameters,such as the data rate,system capacity and reliability,become higher.Due to the hierarchical structure and heterogeneity of most deployed wireless networks,multiple data transmissions using the same communication resource,such as frequency band and time slot,are likely to occur in the same area.Hence,interference and spectrum's under-utilization becomes critical to the decoding of interfered signals and the improvement in communication network performance.Therefore,how to design reception and transmission mechanism so as to manage interference and improve spectrum efficiency and support simultaneous multi-user transmissions becomes the critical issue to the field of wireless communications.This paper focuses on the design of reception and transmission mechanism in multi-user communication system.The main work is as follows:At first,this paper focuses on the reception design in multiple access channels(MACs)where multiple transmitters send data to a common receiver simultaneously.By exploiting the constructive/destructive interactions among interfering signals,we propose a receiver structure based on interference combination(ICom)incorporating zero-forcing(ZF)and successive interference cancellation(SIC).The proposed receiver structure does not require coordination at the transmitter side and can significantly reduce the number of receiving antennas at a moderate processing cost.The ICom-based reception is shown to be able to not only achieve a significant improvement of system spectral efficiency(SE)under stringent latency constraints,but also make a flexible tradeoff between the requirement of receiving antennas and signal processing complexity,thus facilitating its implementation and deployment.Then,the Multiple-Input Multiple-Output(MIMO)downlink communication system employing Non-Orthogonal Multiple Access(NOMA)technique is studied.Based on the theoretical analysis taking error propagation into account,A distance and spatial correlation based user matching criteria is proposed.In addition,the allocation of the base station's transmit power is optimized.Simulation results show that the proposed method can increase the number of subscribers that the system can accommodate,while guaranteeing good system's sum-rate performance.At the end of this paper,we summarize the main work of this paper and propose the research direction in the future.