关键词: 电子技术 , 智能天线 , 干扰抑制 , 波达方向 , 远近效应 , 直接序列／码分多址

Abstract: As two key technologies of the third-generation mobile communication system, the technology of smart antennas and that of CDMA have the potential to improve system performance prominently. The article combined the two technologies and used smart antennas to solve problems in CDMA system such as muiti-access interference and near-far effect. It is based on the application of smart antennas to base-station in a DS/CDMA system. The article discussed a new algorithm that suppresses interference both in the code domain and spatial domain to improve the system performance, namely in suppressing the multi-access in?terference to a full degree in the code domain first, and then suppressing the remainder term in the spatial domain. The algorithm also accomplishes the estimation of DOA (direction of arrival) simultaneously. The analysis and simulation demonstrate that the algorithm not only furnishes some degree of resistance to the near-far effect, but also gives an evident enhancement to the performance and precision of estimation in DOA under low SNR.

Key words: electronic technique , smart antennas , interference suppression , direction of arrival , near-far effect , direct sequence/code division multiaccess