基于波束切換型智能天線技術(shù)的TDD-CDMA系統(tǒng)上行鏈路性能研究
Investigation of Uplink Performances Based on Switched Beam Antenna in TDD-CDMA Systems
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摘要: 該文通過分析波束切換型智能天線技術(shù)的原理，研究了波束切換型智能天線技術(shù)對(duì)TDD-CDMA上行鏈路的影響，給出了采用波束切換型智能天線技術(shù)后適合TDD-CDMA上行鏈路使用的接入控制算法。理論分析和仿真結(jié)果表明智能天線技術(shù)的天線陣元數(shù)和上行鏈路多用戶檢測(cè)技術(shù)優(yōu)劣將直接影響上行鏈路容量，采用先進(jìn)的接入控制算法和優(yōu)化的接入控制門限值則可以顯著提高系統(tǒng)性能。
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關(guān)鍵詞:
- TDD-CDMA; 智能天線;波束切換;接入控制;上行鏈路容量
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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