Analysis of BER Performance of OFDM System by Adaptive Modulation
Sangeeta Jajoria1, Sajjan Singh2, S. V. A. V. Prasad3

1Sangeeta Jajoria, M. Tech. Student, BRCM College of Engineering and Technology, Bahal, Bhiwani (Haryana), India.
2Sajjan Singh, Assistant Professor, Department of ECE, BRCM College of Engineering & Technology, Bahal, Bhiwani (Haryana), India.
3S. V. A. V. Prasad, Professor, Department of ECE, Lingaya’s University, Faridabad (U.P), India.

Manuscript received on 18 October 2012 | Revised Manuscript received on 25 October 2012 | Manuscript published on 30 October 2012 | PP: 6-10 | Volume-1 Issue-4, October 2012 | Retrieval Number: B0619052213/2012©BEIESP
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Abstract: Orthogonal Frequency Division Multiplexing is an emerging broadband multi-carrier modulation scheme. The robust high-bandwidth capabilities of orthogonal frequency division multiplexing confer immediate advantages on wireless products that systems are doing so. OFDM is also being considered for use in 4G cellular systems. A well-known problem of OFDM is its sensitivity to frequency offset between the transmitted and received carrier frequencies. This frequency offset introduces inter-carrier interference in the OFDM symbol. This project investigates adaptive modulation & ICI self-cancellation methods for combating the effects of channel fading & ICI respectively. These methods are compared in terms of bit error rate performance, bandwidth efficiency, and computational complexity. We propose an adaptive modulation method in order to combat channel with deep fading through simulations, it is shown that this technique is effective in mitigating the effects of ICI
Keywords: OFDM, 4G, ICI. 

Scope of the Article: Predictive Analysis