A realistic MIMO time-variant channel applied to diagonalizing precoders

Precoders permits to enhance the performance of MIMO systems by optimizing a pertinent criterion of the transmission. For example, the max-d_min precoder optimizes the minimum Euclidean distance of the received constellation. In this paper, we evaluate the performance of max-d_min in a realistic time-variant channel for both spectral efficiency (4 and 8 bit/s/Hz). The channel is obtained by a 3D Propagation Simulation Software based on a raytracing method. Moreover, the speed effect is introduced by using the Jakes´ model. We are able to obtain the temporal evolution of the channel and the statistics of key random variables. This permits us to study the max-d_min precoder with a perfect channel state information and with a simple channel error estimation. The max-d_min is also compared to the max-SNR precoder.