Abstract—OFDM 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 we 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. We investigate the performance of such VSB-VBL OFDM system with Fixed Sub carrier Bandwidth (FSB-OFDM) system based on Signal Interference to Noise Ratio (SINR) and Symbol Error Rate (SER).
Index Terms—Channel Estimation Error, FSB-OFDM, ICI, VSB-VBL OFDM.
K. Murali Babu is now with the Department of ECE, SVCET, Chittoor, India
K. Vinoth Babu is now with the School of Electrical Sciences, Vellore Institute of Technology, Vellore, India.
K. V. N. Kavitha is now with the School of Electrical Sciences, Vellore Institute of Technology, Vellore, India.
Cite: K. Vinoth Babu, K. V. N. Kavitha and K. Murali Babu, "Low -Complex ICI Reduction due to Channel Estimation Error in OFDM systems using VSB-VBL Technique for High Mobility Applications," International Journal of Computer Theory and Engineering vol. 1, no. 3, pp. 262-266, 2009.