Performance analysis of coded- OFDM with ICI due to frequency offset

In wireless communication, parallel transmission of symbols using multi carriers is applied to achieve high efficiency in terms of throughput and better transmission quality. Orthogonal Frequency Division Multiplexing (OFDM) is one of the techniques for parallel transmission, hi multipath environment the performance of orthogonal frequency division multiplexing (OFDM) is improved by introducing some kind of channel coding. Coded OFDM (COFDM) is the new candidate for application such as DAB and DVB-T due to its better performance in fading environment. However due to lack of synchronization in transmitter and receiver, there may be a offset in transmitted and receiver frequencies which leads to degradation of orthogonality between transmit and receive pulse. Frequency offset causes inter carrier interference (ICI). In this paper our aim is to evaluate the performance of COFDM system in presence of frequency offset. COFDM is generated as per IEEE 802.11a specifications and Reed Solomon (RS) codes along with convolution codes are used for channel coding purpose. Channel used for consideration is AWGN. The performance is evaluated m terms of ICI value and BER.