在移动通信系统中，收发端散射环境变化将导致无线信道呈现非平稳特性，针对基站-移动台之间的三维传播场景，构建了一种非平稳多输入多输出信道模型，该模型考虑了衰落相位的连续性，从而保证输出信道多普勒频率的准确性.提出了一种针对该模型的信道参数更新算法，该算法考虑了传播路径的生灭、时延、功率、出发角和到达角分布等参数随时间变化的演进过程.数值仿真结果表明，所构建的信道模型能够直观地复现无线信道的非平稳特性，输出的各子信道衰落的时变自相关和互相关特性均与理论值吻合，提出的非平稳信道模型的平稳间隔与实测数据相符，可用于三维移动场景下无线通信系统的方案设计、性能优化和系统验证等领域.
Due to the rapid movement of transmitter and receiver, the propagation channel of mobile communication system performs non-stationary characteristics. A new nonstationary multiple-input multiple-output (MIMO) channel model between base station and mobile station under three dimensional (3D) scenarios is proposed. The new model takes the continuity of fading phase into account and guarantees more realistic Doppler frequency. Meanwhile, an extended 3D time evolving algorithm of channel parameters, including birth-death processes of clusters, path delays, path powers and angles of arrival and departure, is given and analyzed. Simulation results demonstrate that our channel model can characterize the properties of non-stationarity and the time-variant autocorrelation function (ACF) and cross-correlation function (CCF) in a good consistence with theoretical ones, and is applicable to the performance evaluation and validation of wireless mobile system under time-variant 3D scenarios.
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