Design And Implementation Of Robust Preencoder Based On Monopole Antenna

In recent years,with the rapid development of wireless communication technology,the research and application of multiple input multiple output(MIMO)system has become the key research direction in the field of communication.MIMO is superior to other systems in diversity and capacity.With the application of precoding,space-time coding and spatial multiplexing,MIMO has made remarkable progress in wireless communication.Due to the complexity of the receiver by transmitting terminal for linear precoding technique to reduce,so the main research content of this paper is aimed at under different channel characteristics and different standards,for multiple input multiple output wireless communication system performance optimization problem of anti-interference suppression research,developed a according to the new robust precoder monopole antenna.In this paper,a robust encoder design of orthogonal space-time block coding is proposed,which is mainly used in relay network on dual correlation Rician fading channel,and each node in the network is equipped with a monopole antenna for signal source transmission.In order to reduce channel feedback,the preencoder is designed based on channel mean and covariance matrix.Because the average received signal to noise ratio(SNR)is closely related to bit error rate(BER),it is used as an objective function.The exact approximation of the lower limit of the mean receiving SNR is derived and used as a design criterion.An iterative algorithm for obtaining suboptimal precoding matrices at source nodes and relay nodes is derived by using maximum ratio combination.Experimental simulation shows that the proposed algorithm can provide fusion robust preencoders for source nodes and relay nodes with only a few iterations.The proposed algorithm is applied to the relay network nodes with monopole antenna,which can obtain less computational complexity and feedback overhead,and accelerate the convergence of iteration.By analyzing the average SNR and BER values,it is found that the proposed robust encoder scheme has a stronger performance gain in the application of monopole antenna than the previous scheme.