| With the development of wireless communications and the rapid growth of multimedia business’requirement, wireless cellular network communication faces many challenges in the future. In order to improve the system spectrum efficiency, the existing communication network usually adopt frequency reuse, time division multiple access (TDMA) and code division multiple access (CDMA) technology. However, these technology that multi-cell whole network with same frequency greatly limit the capacity of cellular system, and make serious interference on the service quality of users (especially the cell-edge’s user). The introduction of multiple antenna systems drastically improves the system capacity and spectrum efficiency. In the multi-antenna technology, one of the most effective is the beam-forming technique, in which weighted antenna arrays form a narrow directional beam that pointed to the user. Using the differences about feature space of desired signal and interference signal to set the signal isolation, thus to get the purpose of enhance the desired signal and restrain interference, improve the quality of communication capacity. The beam-forming technique has gradually become one of the research hot focus in the field of wireless communications at present.The paper focus on the beam-forming technology of wireless MISO system. Based on the analysis of MISO system architecture, characteristic of channel environment and practical application scenarios, we expand the research focus on the beam-forming technique of multi-cell and single-cell multi-user MISO downlink systems. With consideration of the duality between uplink and downlink, the paper study the design of beam-forming problems and deduce the algorithm of corresponding solution, in which makes the corresponding simulation by using MATLAB, analysis the convergence and performance of the algorithm, provides theory support and solutions for the MISO systems’beam-forming technique in wireless link transmission. |
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