Blend of error control codes in OFDM - effect of channel - a comparative approach

Abstract

Role of modern day technology in business world is very imperative and moving. Be it collaboration, telephony, social media etc. in a particular trade, ultimately, information is what being communed. Its importance is more studied and explored in the domain of Business communication. At the same time, emphasis is greatly laid to have secure communication between the parties irrespective of the medium of communication. This is where software and cryptic techniques come into help. Information security plays a crucial role in safeguarding the message or information involved in the communication. Nowadays, right from small vendors to corporate giants, every business organization relies directly or indirectly on cryptic experts for the same. This work is one such blend of technology and security for data protection. This paper deals with the comparative performance analysis of different modulation schemes like BPSK, QPSK, 8QAM, 16QAM, 32QAM and 64 QAM using concatenated Error Control Codes (ECC) in OFDM(Orthogonal Frequency Division Multiplexing). RS(Reed Solomon) codes with Convolutional codes has been used as the concatenated error control code. Then the coded data bits are encrypted to the enhance copy right protection. BER Vs Eb/No graphs are plotted using various modulation schemes adopting AWGN (Additive White Gaussian Noise channel), Rayleigh and Rician Fading Channels. Correlation values are computed for various inner and outer code rates to validate the encryption operation.