DESIGN OF COFDM SYSTEM IN DIGITAL MOBILE COMMUNICATION

Abstract

In this paper I proposed a model for COFDM (coded orthogonal frequency division multiplexing) based on OFDM structure with TCM coding block and with Higher constellation modulation schemes (BPSK, QPSK, 16-QAM, QASK)
Computer simulation models with Matlab system for performance assessment over the effects of channel like noise (AWGN) and multi-path fading channel such as (Rayleigh distribution)
As a result these models of proposed COFDM have better gains in dB at the receiver output under ideal and Rayleigh fading channel and some features like high data rate up to 20MHz at carrier frequency 1GHz, robust to channel propagation effects, increasing resistance to types of interferences, and provide the security by hid the signal from eavesdropper.
These features make the proposed model more suitable to use with wireless communication for 4G (fourth generation) digital mobile communication