International Journal of Computer Theory and Engineering (IJCTE)
OFDM (Orthogonal Frequency-Division Multiplexing) based wireless systems are spectrally efficient but they are vulnerable to Inter Carrier Interference (ICI). The rapid variation of the channel can induce ICI. ICI will significantly increase the difficulty of OFDM channel estimation. ICI due to carrier frequency offset can be mitigated by accurate frequency synchronization but ICI due to fast fading channel is more difficult to handle. This kind of ICI can be easily reduced by increasing the sub carrier spacing. In this paper, they proposed an OFDM system which will use Variable Sub carrier Bandwidth (VSB) with Variable Bit Loading (VBL) to minimize the effect of ICI due to channel estimation error.