Mitigation of ICI Through Optimized SSR ICI Self Cancellation Scheme in OFDM
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Abstract
: Orthogonal frequency division multiplexing (OFDM) is extensively used in wireless communication systems because it offers high data rates and provides a better solution to inter symbol interference (ISI) caused by a multipath channel. A well known problem of OFDM system is sensitive to carrier frequency offset (δ) between the transmitted and received signals. The Frequency offset in wireless communication systems ruins the Orthogonality between subcarriers resulting in Inter Carrier Interference (ICI).Which is a severe problem in OFDM system and eventually decrease the performance of the system. There are numerous techniques are in existence to mitigate the effect of ICI caused by CFO (carrier frequency offset). This paper investigates an innovative ICI cancellation method termed as optimized SSR (symmetric symbol repeat) ICI self cancellation scheme. The proposed method utilizes an optimum data allocation (1,-λ) and combining (1,-µ) scheme to improve CIR performance for an estimated normalized frequency offset δ. However, this requires continuous CFO estimation and feedback circuitry. To avoid the requirement of CFO, sub optimal values (λso, µso) are considered for combating the effect of ICI. This paper mainly focus on comparison of proposed method with the previous reduction methods and standard OFDM system in terms of CIR (carrier to interference) & BER (bit error rate) performance.
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References
Y.Wu and W. Y. Zou, “Orthogonal frequency division multiplexing: A multicarrier modulation scheme”, IEEE Transaction on Consumer Electronics, vol. 41, no. 3,pp 392-399, Aug. 1995
R. van Nee and R. Prasad, OFDM for Wireless Multimedia Communications. Norwood, MA: Artech House, 2000
P.H.Moose, “A Technique for orthogonal frequency division multiplexing frequency offset correction,’’, IEEE Trans. Commun., vol.42, pp2908-2914, Oct. 1994.
Zhao Y, Haggman SG. “Inter carrier Interference SelfCancellation Scheme for OFDM Mobile Communication Systems”, IEEE Trans.Commun 2001; 49(7): 1185-1191
Yeh HG, Chang YK, Hassibi B. “A scheme for cancelling inter carrier interference using conjugate transmission in multicarrier communication systems”, IEEE Trans. Wireless Communication 2007; 6(1): 3-7.
Wang C-L, Huang Y-C. “Inter carrier Interference Cancellation Using General Phase Rotated Conjugate Transmission for OFDM Systems”, IEEE Transactions on Communications 2010; 58(3): 812-819.
K.Sathanantham, R.M.A.P.Rajatheva and Slimane Ben Slimane “Analysis of OFDM in the Presence of Frequency Offset and a Method to Reduce Performance Degradation” Global Tele communications Conference, 2000. GLOBECOM '00. IEEE,vol. 1,pp. 72-76, 2000
Ashish goel, ankit nagpal and jasmeet kaur, "Optimized data allocation and combining scheme for ICI self cancellation in OFDM system" IEEE 978-1-4673-1989-8/12, Aug 2012.
J. H. Mathews, K. K. Fink, “Numerical Methods using Mat lab’, 4thedition, Prentice-Hall Inc. , 2004.