Modeling and simulating the time‐varying movement in MIMO downlink by integrating ADS with Matlab

Summary Communication systems and radar systems generally face problems caused by time‐varying motion, especially in the case of complex radio wave propagation in cities. Therefore, it is necessary to establish a suitable channel model to simulate the system to deal with these problems. This paper refers to the MIMO space‐time channel model in the 3rd Generation Partnership Project (3GPP) technical standard and proposes a method for modeling and simulating time‐varying motion in a MIMO downlink system according to the characteristics of the wireless channel and the transmission mode. The transmission function in MIMO downlink is derived to calculate the different Doppler frequency shift in the model based on 3GPP. By integrating ADS with Matlab software, environmental parameters and correlation coefficients can be manually set to simulate the downlink. During the simulation process, different modulation model bandwidths and channel conditions are set, and the configuration of the antenna parameters changes accordingly. Finally, the differences of simulation results are analyzed. A method of modeling and simulating the time‐varying movement in MIMO downlink system based on correlation matrix is presented. The model fully considers the influence of time‐varying motion and transmission data flow affected by independent fading conditions. Bit error rate between various scenes at the receiving terminal are compared and analyzed.