Wireless Personal Communications

, Volume 78, Issue 2, pp 1129–1141 | Cite as

Interaction between Symbol Timing Offset and Channel Interpolation in OFDM Systems: BER Analysis and Performance Degradation

  • Serafin Salido
  • F. Javier Lopez-Martinez
  • Eduardo Martos-Naya
  • J. Tomas Entrambasaguas
Article
  • 169 Downloads

Abstract

In orthogonal frequency division multiplexing (OFDM) systems, since the cyclic prefix (CP) is designed to be longer than the channel impulse response, there exists a certain range within the CP where symbol timing synchronization can be accomplished avoiding adjacent inter symbol interference. However, the appearance of a linear phase term across subcarriers in the frequency-domain due to symbol timing offset (STO) is known to affect the performance of channel interpolation. In this paper, we analyze the performance degradation due to the interaction between STO and channel interpolation in OFDM systems affected by multipath Rayleigh fading. Particularly, simple closed-form expressions for the bit error rate (BER) are obtained for different quadrature amplitude modulation constellations. Results show that there exists an irreducible BER floor due to STO and channel interpolation, which depends on the STO, the subcarrier index, the pilot spacing and the correlation between pilot subcarriers.

Keywords

Bit error rate Channel estimation errors Digital video broadcasting  Linear interpolation Orthogonal frequency division multiplexing Timing offset 

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Serafin Salido
    • 1
  • F. Javier Lopez-Martinez
    • 2
  • Eduardo Martos-Naya
    • 3
  • J. Tomas Entrambasaguas
    • 3
  1. 1.Agilent Inc.MalagaSpain
  2. 2.Wireless Systems Lab, Electrical Engineering DepartmentStanford UniversityStanfordUSA
  3. 3.Dpto. Ingenieria de ComunicacionesUniversidad de MalagaMalagaSpain

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