Combined Efficient Precoding Technique for Multi-User MIMO

Recently, a multiuser MIMO system has attracted much attention because of an important area of focus for next generation wireless system because of their potential for higher capacity, increased diversity and interference suppression with leading higher data rate support. In Multiuser MIMO (MU-MIMO) systems, precoding is essential to eliminate or minimize the multiuser interference (MUI) as in the downlink of the multiuser MIMO system where the base station simultaneously transmits signals to terminals. However, the design of a suitable precoding algorithm with good performance and low computational complexity at the same time is quite challenging, especially with the increase of system dimensions which increases with number of antennas. In this thesis, we mainly focus on MU-MIMO broadcast channel, consider the case where the multiple transmit antennas are used to deliver independent data streams to multiple users and compare the performance for linear and non linear precoding techniques in terms of BER, SNR and complexity point with increase in the number of users and the number of transmit antennas. We propose a new practical scheme leads with low computation complexity and better BER performance with better system utilization.