Maximum SINR design method of MIMO communication systems using tapped delay line structure in receiver side

We propose a simple method of designing MIMO communication systems using a TDL structure in the receiver side. Based on a maximum SINR (signal-to-interference-and-noise ratio) criterion, weight vectors in both the transmitter and receiver arrays are determined alternately, fixing one side while calculating the other, and this operation is repeated until the SINR converges. Simulation results show that a MIMO system with a TDL structure designed using the proposed method has a higher performance than a conventional one not using TDL, particularly in the case of a long delay profile. Moreover, to reduce the number of operations, variations of the proposed approach are presented, in which the large scale problem is converted to a set of problems with small scale, by dividing weights into several subgroups and carrying out optimization group by group. It is shown that these methods fall between the conventional and proposed methods with regard to both performance and computational cost.