基于波束切换型智能天线技术的TDD-CDMA系统上行链路性能研究
Investigation of Uplink Performances Based on Switched Beam Antenna in TDD-CDMA Systems
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摘要: 该文通过分析波束切换型智能天线技术的原理，研究了波束切换型智能天线技术对TDD-CDMA上行链路的影响，给出了采用波束切换型智能天线技术后适合TDD-CDMA上行链路使用的接入控制算法。理论分析和仿真结果表明智能天线技术的天线阵元数和上行链路多用户检测技术优劣将直接影响上行链路容量，采用先进的接入控制算法和优化的接入控制门限值则可以显著提高系统性能。Abstract: The switched beam antenna is analyzed and its model in system level is presented. Based on analyzing the impact of multi-user detection (MUD) and switched beam antenna on the uplink capacity in TDD-CDMA systems, a novel uplink admission control algorithm is proposed. The theoretical and simulation results show that MUD and the number of antenna element have a great impact on uplink performance. The proposed scheme can provide higher gain for TDD-CDMA if the proper noise rise threshold is set.
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