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中文摘要：
提出了一种改进的蜂窝分布式天线系统结构（IDAS），该结构采用定向天线单元并将其合理放置，通过仿真分析了在3种系统结构下阴影衰落的差异及其相关性对误码率和信道容量的影响．分析和仿真结果表明，相对于现有蜂窝分布式天线系统结构（EDAS）和传统蜂窝结构（TC），IDAS能够更好地降低其误码率并提高信道容量，特别是在小区信道质量非常差的边界区域中．
英文摘要：
An improved cellular distributed antennas system （IDAS） configuration was proposed, which adopts directional antennas and lies them reasonably. Comparing with the existing cellular distributed antennas system （EDAS） configuration and traditional cellular （TC） configuration, both the theoretic analysis and simulations validate that IDAS can acquire lower symbol error probability and larger channel capacity especially in the adverse channel conditions. The influence of shadow fading to the signal transmission was also discussed.
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