Impacts of Gaussian Error and Doppler Spread on the Performance of MIMO Systems with Antenna Selection

Recently,the antenna selection(AS) scheme is a hot topic in the region of multiple-input multiple-output(MIMO) systems,due to lower complexity.In the previous research,it is assumed that the channel state information(CSI) is available at the receiver,which,however,is impractical in the wireless transmission environment.During the process of the channel estimation,there exists two-aspect impacts,namely Gaussian errors and Doppler spread,which are caused by Gaussian noise and the speed of mobile,respectively.In this paper,we analyze the performance of AS systems with the imperfect CSI,caused by Gaussian errors and Doppler spread,and derive the exact bit-error-ratio(BER) expression of AS systems in Rayleigh fading channel,using space-time coding transmission scheme.The corresponding simulations are carried out to illustrate the impacts of Gaussian errors and Doppler spread on the performance of AS systems and to prove the theoretical analysis.The results show that the length of pilot symbols needs a tradeoff under this environment with Doppler spread and Gaussian errors.