Performance Improvement in OFDM System Using Modified Sinc Pulse as Receiver Window

The Orthogonal Frequency Division Multiplexing (OFDM) system have some problems such as carrier frequency offset, timing offset, and Peak to Average Power Ratio (PAPR). The impacts of these problems results into inter carrier interference (ICI) which affects the bit error rate (BER). Therefore, suitable methods are required to mitigate ICI at the receiver. In this paper a new pulse shape, by modifying Sinc Pulse (SP) has been introduced, and used in OFDM system at the receiver as windowing in order to reduce ICI power. The pulse shape has been designed to obtain a small average ICI power and better BER performance. It has been observed that the proposed pulse window has better SIR performance than that of ISP pulse window at the normalized frequency offset is less than 0.06. The BER performance of proposed window has been compared with that of conventional Nyquist windows and MBH window. The proposed Index Terms – OFDM, ICI, Receiver windowing, Frequency offset, BER, Sinc Pulse, ISP.