Performance evaluation of SNR in radio over fiber systems for different modulation schemes in AWGN channel and fading channels

This paper discusses the performance of radio-over-fiber systems in different channels for distributing gigabit-per-second wireless signals at millimetre wave frequencies. Nonlinear distortions (NLD) in the channel reduce the dynamic range (distortion-free range for the input signal) of radio-over-fibre (ROF) links. Performance comparison of RoF in different channels shows that the dynamic range is highest in AWGN channel (highest SNR) and lesser in Rayleigh channel than Rician channel. An Orthogonal Frequency Modulated(OFDM) signal is Mach Zehnder Modulated (MZM), the generated optical signal is amplified by an Erbium Doped Fiber Amplifier (EDFA), noises are filtered, transmitted to a Radio Access Point (RAP) through a single-mode optical fiber and reached at the end user passing AWGN, Rayleigh and Rician channels.