分布式天线系统中信道时延扩展的统计分析

从理论上分析了复合衰落下两支路分布式天线系统信道时延扩展的统计特性,同时作为特例,分析了仅考虑单一尺度衰落时的相关特性。最后在城市环境典型参数下,基于蒙特卡洛仿真对所导出的解析结果进行了验证,仿真结果验证了解析结果的正确性。由于均方根时延扩展的统计特性所依赖的参数多,在实际应用,必须按照实际场景固定某些参数来考察某一参数的影响。

Statistical analysis of delay spread in distributed antenna systems

The statistical properties of delay spread in a two-path distributed antenna system were analyzed,of which each path was characterized by Rayleigh fading and lognormal shadowing.As a special case,the statistical properties of delay spread in single scale alone fading environments were also obtained.Finally,a Monte Carlo simulation model was constructed using the channel parameters under typical urban environments,and the derived expressions were validated by simulation results.Because the root mean square of delay spread depended on many parameters,the effect of one specified parameter was considered under the condition of other parameters being fixed according to the practical scenarios.