SECURED TEXT MESSAGE TRANSMISSION IN PRE -CHANNEL EQUALIZATION BASED MIMO- OFDM SYSTEM WITH IMPLEMENTATION OF CONCATENATED ECB AND CFB CRYPTOGRAPHIC ALGORITHM
Laila Naznin1,Shahrina Sultana1, M. Golam Rashed1 and Shaikh Enayet Ullah2
1Department of Information and Communication Engineering, University of Rajshahi, Rajshahi, Bangladesh
2Department of Applied Physics and Electronic Engineering, Rajshahi University, Rajshahi, Bangladesh
ABSTRACT
In this paper, we made a comprehensive performance evaluative study of a secured MIMO Orthogonal Frequency-Division 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 remarked from simulation results that the MIMO OFDM system outperforms with pre-ZF channel equalization,QAM digital modulation and BCH channel coding schemes under fading channels(AWGN and Raleigh).In Pre-MMSE/pre-ZF channel equalization scheme, the system shows comparatively worst performance in convolutional channel coding scheme with QAM/QPSK digital modulation. With increase in noise power as compared to signal power, the system is found to have shown performance deterioration.
KEYWORDS
MIMO-OFDM, Pre-MMSE, Pre-ZF, ECB and CFB cryptographic algorithm, Bit Error rate(BER), AWGN and Raleigh fading channels.
Original Source URL : http://airccse.org/journal/nsa/0912nsa14.pdf
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