PERFORMANCE ANALYSIS OF ZF AND MMSE DECODERS AND ANALYSING THE BER FOR MIMO SYSTEMS

A leading breakthrough in wireless communications has come into existence with the help of Multiple Inputs Multiple Output (MIMO) Systems. It is aimed to achieve a high data rate with a high spectral efficiency without altering the channel statistics. A high throughput can be obtained especially when MIMO is used in a scattering rich environment. Here the system has been analyzed at a high signal to noise ratio (SNR) using Binary Phase Shift Keying (BPSK) modulation technique and by using various linear detectors. Several techniques can be applied to this system. Some of them are Space time trellis codes, Space time block codes, D- BLAST and V-BLAST. The implementation complexity of diagonal approach is considerably high hence it is generally avoided. The V-BLAST is easy to implement and considered as an appropriate technique. Here, a MIMO system with Zero Forcing (ZF) Minimum Mean Square Error (MMSE) detector and Maximal Ratio Combining (MRC) is presented in this letter. Both the techniques have been analyzed with respect to their general characteristics and bit error rate performance. Finally the performance and the simulation results are also shown.