Study the Effect of Co-Channel Interference in STC MIMO-OFDM System and Mitigation of CCI using Beamforming Technique

摘要

In this modern age of high speed wireless data communication, Multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) schemes have recently drawn wide interests due to their capability of high data rate transmission over multipath fading channels. This thesis work introduces the study of multi- user and multi-antenna MIMO-OFDM systems. In this work, the performances of two main classes of MIMO-OFM system i.e. multi-user and multi-antenna MIMO-ODM techniques have been studied. The transmitted data is sent using BPSK, QPSK modulation techniques. The performance of the system in Rayleigh and AWGN channel is studied. Space time coding technique also used in transmitting side of the multi-antenna MIMO system.Study and analysis of the effect of co-channel interference over wireless communication system is considered the main objective of this project work .Beamforming technique is one of the best techniques to mitigate co-channel interference. There are several beamforming techniques like LMS, RLS style beamforming techniques. LMS style adaptive beamforming technique is applied to the system. The performance of the LMS style beamforming technique for mitigation of co-channel interference has been analyzed for different modulation techniques.The performance comparison between the adaptive beamforming and null steering beamforming techniques is carried out for the space time coded MIMO-OFDM system. From the performance analysis, it is observed that to mitigate the co-channel interference in ST coded MIMO-OFDM system, adaptive beamforming technique outperforms the method based on the null steering beamforming.