MIMO-OFDM BPSK-QPSK-PSK SYSTEM

ABSTRACT: This paper present the review of Wireless communication systems suffer from fading and signal attenuation due to the mobility factor associated with it. OFDM (Orthogonal Frequency Division Multiplexing) is a multicarrier technique that offers high spectral efficiency. MIMO (Multiple Input Multiple Output) configuration provides enhanced capacity with the same transmit power. OFDM combined with MIMO offers increased diversity gain and system capacity in time variant and frequency variant channels. MIMO- OFDM configuration is found to perform better against multi-path fading and the varying channel conditions, than the conventional technologies. Precoding is a new technique that can be applied which helps to improve the performance of a MIMO OFDM system. In this paper, the BER performance of a MIMO-OFDM system using precoding is simulated for BPSK, QPSK, 16 PSK and 16 QAM modulation formats. The objective of this paper is to show the information about the improvement of channel estimation accuracy in MIMO-OFDM system. The MIMO-OFDM system is the combination of the MIMO technique and OFDM technique, which is enhancing the capacity, improve the link reliability high data rate transmission for future broadband wireless communication and also use for avoid Inter Symbol Interference (ISI)