Experimental and analytical studies on a high-resolution OFDM carrier frequency offset estimator


TÜRELİ M. S. U. , Kivanc D., Liu H.

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, vol.50, no.2, pp.629-643, 2001 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 50 Issue: 2
  • Publication Date: 2001
  • Doi Number: 10.1109/25.923074
  • Title of Journal : IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
  • Page Numbers: pp.629-643

Abstract

In orthogonal frequency-division multiplexing (OFDM) communications, carrier frequency offset must be estimated and compensated at the receiver to maintain orthogonality. In this paper, we examine the performance of a blind carrier frequency offset estimation algorithm for OFDM communications. Experiments were conducted on a system operating at close to 2 MBits/s, Insights obtained from these experiments provided the motivation to explore the fundamental relationships between estimator performance and multiple system parameters such as the signal-to-noise ratio, number of data samples, frequency-selective fading, and power loading. We examine the sensitivity of the blind carrier frequency offset estimation algorithm using first-order perturbation analysis, In particular, we derive a closed-for m expression for the mean square error of the carrier frequency offset estimator and present tradeoff studies for the high-resolution blind estimator performance, The analytical and simulation studies are in good agreement with experimental results.