多点协作传输中协作波束赋形技术的研究.pdfVIP

Subject ： Research on Coordinated Beamforming Technique in Coordinated Multipoint Transmission System Specialty ：Communication and Information System Name ：Yin Zhiwei （Signature） Instructor ：Wang Yanwen （Signature） ABSTRACT Since the interference between cells in LTE system is so severe that the existing interference coordination technologies cannot resolve the low spectrum efficiency problem of edge users, LTE-A introduces the Coordinated Multi-Point transmission/reception (CoMP) technology. CoMP can improve the system capacity and increase the spectrum efficiency of edge users in the cell by employing Joint Processing (JP) and Coordinated Beamforming (CB), which can reduce interference from the adjacent cells and improve the received signal quality of users. Beamforming is an important technique to improve the spectrum efficiency in next generation wireless cellular networks, and based on the research of multi-user beamforming technique, this paper mainly stud ies CB technology of CoMP. On the condition that the coordinated base stations has known ideal channel information of users, coordinated beamforming algorithms based on zero forcing(ZF-CB) and signal-to- leakage-and-noise ratio (SLNR-CB) are studied. ZF-CB algorithm can make the interference to edge users in the adjacent cells completely eliminated in the base station side, but the number of transmit antennas of the base station is subjected to certain constraint. SLNR-CB algorithm overcomes the above constraint and is easy to solve. Compared with non-cooperative case, simulation results show that both algorithms manifest good performance, and when the num