Analysis and Simulation of Intercarrier Interference Due to Phase Noise in OFDM System by Using PLL

Orthogonal Frequency Division Multiplexing (OFDM) technique has received a great attention and has been widely used in the wireless communication systems for its high spectrum efficiency and robustness to the narrowband interference and multipath fading. The technique is to divide the channel into many orthogonal subchannels in the frequency domain, and convert the high speed signals to parallel low-speed signals which are transmitted on each sub-channel in parallel with corresponding orthogonal modulated sub-carrier. But it yields however some disadvantages too, one being an increased sensitivity to phase noise, which is generated in the local oscillators. This paper mainly investigate the effect of phase noise upon OFDM system and realized local oscillator (LO)by using phase locked loop (PLL). Then system performance is evaluated as a degradation of the effective signal-to-noise ratio due to phase noise, in terms of BER simulations with and without PLL for different channel conditions.