Call for Paper - November 2023 Edition
IJCA solicits original research papers for the November 2023 Edition. Last date of manuscript submission is October 20, 2023. Read More

ICI Reduction in Multicarrier Systems

International Journal of Computer Applications
Foundation of Computer Science (FCS), NY, USA
Year of Publication: 2016
Shaimaa ElSayed Ibrahim, K. A. ElBarbary, Ragab M. El-Sagheer

Shaimaa ElSayed Ibrahim, K A ElBarbary and Ragab M El-Sagheer. Article: ICI Reduction in Multicarrier Systems. International Journal of Computer Applications 133(13):18-26, January 2016. Published by Foundation of Computer Science (FCS), NY, USA. BibTeX

	author = {Shaimaa ElSayed Ibrahim and K. A. ElBarbary and Ragab M. El-Sagheer},
	title = {Article: ICI Reduction in Multicarrier Systems},
	journal = {International Journal of Computer Applications},
	year = {2016},
	volume = {133},
	number = {13},
	pages = {18-26},
	month = {January},
	note = {Published by Foundation of Computer Science (FCS), NY, USA}


Inter-Carrier Interference (ICI) is a major contribution to performance degradation in multicarrier systems. The main reason of the ICI is the Carrier Frequency Offset (CFO). Some researchers reduced the effect of this ICI by estimating the CFO value then compensating for it. The CFO estimation accuracy affects in turn the multicarrier system performance. The Repeated Prefix (RP) is a new technique that is recently proposed to reduce the ICI effect by estimating the CFO value without producing mathematical derivations. The drawback of this technique is its low performance at low guard interval values. This paper enhances the performance of this method at low guard interval values, giving the Maximum Likelihood Estimation (MLE) derivation for this process in addition to a derivation of the relative Cramer-Rao Lower Bound (CRLB). The proposed technique (RP-combined) reduces the effect of the residual ICI and can be used once in the transmitted frame with less data rate losses.Simulations show comparable results between both theoretical and simulated cases. Simulations also show the system performance with/without using channel estimation stage to show that, the channel estimator increases the immunity of the system performance to ICI for small offset values.


  1. M. M. a. U. Mengali, "An Improved Frequency Offset Estimator for OFDM Applications," in IEEE, Communication Theory Mini-Conference, Vancouver, BC, 1999.
  2. Y.-H. Y. J.-H. P. a. Y.-S. C. Hyoung-Kyu Song, "Frequency-Offset Synchronization and Channel Estimation for OFDM-Based Transmission," IEEE Communications Letters, vol. 4, no. 3, pp. 95-97, March 2000.
  3. J. L. Q. Z. a. H.-L. L. Ji-Woong Choi, "Joint ML Estimation of Frame Timing and Carrier Frequency Offset for OFDM Systems Employing Time-Domain Repeated Preamble," IEEE Transactions on Wireless Communications, vol. 9, no. 1, pp. 311-317, Jan. 2010.
  4. M. S. a. P. O. B. Jan-Jaap van de Beek, "ML Estimation of Time and Frequency Offset in OFDM Systems," IEEE Transactions on Signal Processing, vol. 45, no. 7, pp. 1800-1805, July 1997.
  5. W.-L. Chin, "ML Estimation of Timing and Frequency Offsets using Distinctive Correlation Characteristics of OFDM signals over Dispersive Fading Channels," IEEE Transactions of Vehicular Technology, vol. 60, no. 2, pp. 444-456, Feb. 2011.
  6. K. E. a. R. M. E.-S. Shaimaa ElSayed Ibrahim, "CFO Mitigation in OFDM Systems with a Comparative Analysis to CP-Based Estimator Technique," in IEEE 32nd National Radio Science Conference (NRSC 2015), 6th of October City, 2015.
  7. K. E. a. R. M. E.-S. Shaimaa ElSayed Ibrahim, "Maximizing CFO Estimation Range using a New OFDM Symbol Structure," International Journal of Computer Applications (0975-8887), vol. 88, no. 4, pp. 5-13, Feb. 2014.
  8. S. Sharma, Digital Signal Processing: with Matlab Programs, fifth edition, 2009.
  9. J. K. W. Y. Y. a. C. G. K. Yong Soo Cho, MIMO-OFDM wireless communications with MATLAB, (Asia) Pte Ltd: John Wiley & Sons, 2010.
  10. Q. W. a. M. Rupp, "Analytical Link Performance Evaluation of LTE Downlink with Carrier Frequency Offset," in IEEE Conference Record of the Forty Fifth Asilomar Signals, Systems and Computers (ASILOMAR), Pacific Grove, CA, 2011.
  11. F. H. a. G. Matz, Wireless Communications over Rapidly Time-Varying Channels, Academic Press: Elsevier, 2011.
  12. G. a. R. M. Jeffrey G. Andrews, Fundamentals of WiMAX Understanding Broadband Wireless Networking, Pearson Education, Inc, 2007.
  13. Steven M. Kay, Fundamentals of Statistical Signal Processing: Estimation Theory, Prentice Hall, 1993.
  14. S. Ahmadi, Mobile WiMax: A System Approach to Understanding IEEE 802.16m Radio Access Technology, ISBN: 978-0-12-374964-2: Elsevier, 2011.


Orthogonal frequency division multiplexing (OFDM), channel estimation, Repeated Prefix (RP), inter-carrier interference (ICI), carrier frequency offset (CFO), Maximum Likelihood Estimation (MLE), Cramer-Rao Lower Bound (CRLB).