An Improved ICI Self Cancellation Method to Reduce ICI in OFDM Systems
Silky Pareyani1, Prabhat Patel2

1Ms. Silky Pareyani, Electronics & Communication Department, Jabalpur Engineering College, Jabalpur (M.P), India.
2Dr. Prabhat Patel, Electronics & Communication Department, Jabalpur Engineering College, Jabalpur (M.P), India.

Manuscript received on 15 November 2012 | Revised Manuscript received on 25 November 2012 | Manuscript Published on 30 November 2012 | PP: 27-31 | Volume-1 Issue-6, November 2012 | Retrieval Number: E0322101612/15©BEIESP
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Abstract: Orthogonal frequency division multiplexing systems are highly sensitive to frequency offset introduced by the wireless channels. This frequency offset destroys the orthogonality between the OFDM subcarriers and causes inter-carrier interference (ICI). Self-cancellation schemes which have been developed to combat the impact of frequency offset on OFDM systems have received a lot of attention due to their simple implementation and high efficiency. This paper proposes an efficient ICI self cancellation scheme to combat the impact of ICI on OFDM systems. In this scheme at the transmitter side, one data symbol is modulated onto four subcarriers with appropriate weighting coefficients. At the receiver side, the linear combination of the received signals on these subcarriers leads to a sufficient reduction in ICI. A detailed analysis and simulation over AWGN channel proves that the proposed scheme achieves better BER (Bit Error Rate) performance and CIR improvement than the existing self cancellation schemes.
Keywords: Orthogonal Frequency Division Multiplexing (OFDM), Inter-Carrier Interference (ICI), ICI Self Cancellation, Frequency Offset, Carrier-To-Interference Ratio (CIR)

Scope of the Article: Frequency Selective Surface