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针对现有信道仿真模型要求支路数目多且仿真时间长的问题,提出了一种基于随机游动的谐波叠加改进方法,详细推导了该模型输出信道衰落幅值分布及空时相关系数的理论表达式。针对3GPP空间信道模型(Spatial Channel Model,SCM)标准参数的仿真结果表明,新方法输出衰落幅值分布和各子信道衰落空时相关特性均与理论值非常吻合,优于传统精确多普勒频率扩展的仿真方法,可用于未来大规模多支路的多输入多输出(Multiple-Input Multiple-Output,MIMO)信道或多节点网络信道的实时仿真场合。
In order to solve the problem that existing channel simulation models require more branches and longer simulation time, an improved method of harmonic superimposition based on random walk is proposed. The amplitude distribution of the output channel fading amplitude and space-time correlation coefficient Theoretical expression. Simulation results of standard parameters of Spatial Channel Model (SCM) for 3GPP show that the proposed method fits well with the theoretical values and is better than the traditional exact Doppler frequency The extended simulation method can be used for real-time simulation of multiple-input multiple-output (MIMO) channel or multi-node network channel in large-scale multi-branch in the future.