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建立了离散化时变信道的简化模型,能够同时反映出高速移动通信环境中的快时变与多径传播两种特性;建立了快变信道的基扩展逼近模型,同时对基函数扩展阶数和系数进行优化,以进一步降低模型算法的复杂度;建立了适用于快变信道的帧格式优化模型,优化系统导频数,进一步提高系统的传输效率.对三种典型的基函数(复指数基、离散卡洛基和多项式基)进行了性能分析,并从精度、稳健性、复杂度等方面进行了比较.根据新的离散化时变信道模型,建立了基于Jakes模型的快变多径信道仿真器,搭建了一个实用的通信系统仿真平台,通过仿真系统的BER性能验证了所建模型的有效性.
A simplified model of discrete time-varying channel is established, which can reflect both fast-time-varying and multipath propagation in high-speed mobile communication environment at the same time. A fast approximate base expansion approximation model is established. At the same time, And the coefficients are optimized to further reduce the complexity of the model algorithm.Finally, a frame format optimization model for fast changing channel is established to optimize the number of system pilots and further improve the transmission efficiency of the system.On the basis of three typical basis functions , Discrete Kalocchi and polynomial basis) are compared and analyzed in terms of accuracy, robustness, complexity, etc. According to the new discrete time-varying channel model, a Jakes-based fast variable multipath channel Simulator, a practical communication system simulation platform is set up, and the validity of the proposed model is verified by simulating the BER performance of the system.