A REVIEW ON PERFORMANCE OF OPTICAL COMMUNICATION NETWORKS USING DIFFERENT MODULATION TECHNIQUE

The demand for high-speed mobile wireless communications is growing at a very fast rate. OFDM technology is a key technique for achieving the high data rate and spectral efficiency requirements for wireless communication systems. Orthogonal Frequency Division Multiplexing (OFDM) [3–6] has emerged as a successful air-interface technique. The Orthogonal frequency division Multiplexing was originally developed from the multi-carrier modulation techniques used in high Frequency military radios. This paper presents, using Additive White Gaussian Noise channel (AWGN) and racian channel to studyand compair the performance analysis of Bit Error rate (BER) Vs Signal to Noise ratio (SNR). The model of OFDM with Rician fading channel using simulink in MATLAB is discussed. This model is used for performance enhancement of the OFDM with QPSK and QAM modulation schemes and channel condition. The throughput and packet error rate are used to evaluate the performance of communication with the change in physical layer parameter. The performance analysis of different technique used in the QAM OFDM is compared by visualizing the BER vs SNR curve.