Performance of COFDM Technology for the Fourth Generation (4G) of Mobile System with Convolutional Coding and Viterbi Decoding
The fourth generation (4G) of mobile cellular system network is growing very fast and new services come-up, so intelligent way of visualization and managing the 4G network and service states are required. In this paper, coded orthogonal frequency division multiplexing (COFDM) scheme using convolutional coding with different code rates and Viterbi decoding is used to analyze its performance with respect to un-coded OFDM over both defined categories (A and B) of the 4G system. The bit error rate (BER) is deeply studied taking into account additive white Gaussian noise (AWGN) channel. Hard decision and soft decision of Viterbi decoding are compared through BER. In order to reach high data rate a higher order of modulation schemes M-QAM (M=16, 64 and 256) are employed. Obtained results show that a significant improvement of BER is due to using forward error correcting (FEC) or channel coding compared to un-coded OFDM strategy. The using of two categories of COFDM in 4G parameters gives a good opportunity to make a multiple choices for best selecting the 4G category which make it useful in wide range of environments.
Keywords: 4G, COFDM, convolutional coding, Viterbi algorithm, soft decision, hard decision.
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ABOUT THE AUTHORS
Djamel Slimani
LIS laboratory Electronics Department Faculty of Technology University of SETIF-1, 19000. Algeria
Mohammed F. Alsharekh
Electrical Engineering Department, Unaizah Engineering College, Qassim University, Saudi Arabia
Djamel Slimani
LIS laboratory Electronics Department Faculty of Technology University of SETIF-1, 19000. Algeria
Mohammed F. Alsharekh
Electrical Engineering Department, Unaizah Engineering College, Qassim University, Saudi Arabia