A Novel Modulation Technique Algorithms on Channel Coding and decoding

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) hasgained increased interest due to its robustness against multipathinterference and high spectrum efficiency. OFDM is asuitable candidate for high data rate transmission with forwarderror correction (FEC) methods over wireless channels. In thispaper, the system throughput of a working OFDM system hasbeen enhanced by channel coding technique like Reed Solomoncode& Turbo Code. Forward Error Correcting codes are a newclass of codes that can achieve exceptional error performanceand energy efficiency at low signal-to-noise ratio. The simulation is made with the development of Models in theSIMULINK & computer program written in MATLAB sourcecode on the random data under additive white Gaussian noise(AWGN) channel. The simulation results of estimated Bit errorrate (BER) show that the implementation of RS code with ½ -rated under QPSK modulation technique is highly effective tocombat inherent interference in the communication system.Fordecoding of Turbo code, MAP decoding algorithm is used. Incase of Turbo code BER performance is substantially improvedby increasing number of iterations used in the decoding process.