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In this paper, we made a comprehensive performance evaluative study of a secured MIMO Orthogonal FrequencyDivision Multiplexing wireless communication system with implementation of two pre channel equalization techniques such as Pre-Minimum Mean Square Error (Pre-MMSE) and Pre-Zero Forcing (Pre-ZF) under QPSK and QAM digital modulations. The simulated system deploys three channel coding techniques (1/2-rated Convolutional, CRC and BCH). In the present simulated system, text message transmission has been secured with concatenated implementation of Electronic Codebook (ECB) and Cipher Feedback (CFB) cryptographic algorithm. It is anticipated from the numerical results that the pre-ZF channel equalization based MIMO OFDM wireless communication system outperforms in QAM digital modulation and BCH channel coding under AWGN and Raleigh fading channels .In Pre-MMSE/pre-ZF channel equalization scheme, the system shows comparatively worst performance in convolutional channel coding scheme with QAM/QPSK digital modulation. It has been observed from the present study that the system performance deteriorates with increase in noise power as compared to signal power.

international journal of network security and its applications/international journal of network security and applications

Secured Text Message Transmission in Pre -Channel Equalization Based MIMO- OFDM System with Implementation of Concatenated ECB and CFB Cryptographic Algorithm