A low-complexity symbol time estimation for OFDM systems

Wen-Long Chin, Sau Gee Chen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Conventional symbol time (ST) synchronization algorithms for orthogonal frequency-division multiplexing (OFDM) systems mostly are based on maximum correlation result of the cyclic prefix. Due to the channel effect, one needs to further identify the channel impulse response (CIR) so as to obtain a better ST estimation. Overall, the required computational complexity is high because it involves correlation operation, as well as the fast Fourier transform (FFT) and inverse FFT (IFFT) operations. In this work, without the FFT/IFFT operations and the knowledge of CIR, a low-complexity time-domain ST estimation is proposed. We first characterize the frequency-domain interference effect as a function of the ST by deriving some analytical equations considering the channel effect. Based on the derivation, the new method locates the symbol boundary at the sampling point with the minimum interference in the frequency-domain. Moreover, for reducing the computational complexity, the proposed frequency-domain minimum-interference metric is converted into a low-complexity time-domain metric by utilizing the Parseval's theorem and the sampling theory. Simulation results exhibit high performances for the proposed algorithm in the multipath fading channels.

Original languageEnglish
Title of host publication2008 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP
Pages3053-3056
Number of pages4
DOIs
Publication statusPublished - 2008
Event2008 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP - Las Vegas, NV, United States
Duration: 2008 Mar 312008 Apr 4

Other

Other2008 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP
CountryUnited States
CityLas Vegas, NV
Period08-03-3108-04-04

Fingerprint

frequency division multiplexing
Fast Fourier transforms
Orthogonal frequency division multiplexing
Impulse response
Computational complexity
interference
impulses
Sampling
sampling
Multipath fading
time synchronization
Fading channels
fast Fourier transformations
fading
Synchronization
derivation
theorems
simulation

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Signal Processing
  • Acoustics and Ultrasonics

Cite this

Chin, W-L., & Chen, S. G. (2008). A low-complexity symbol time estimation for OFDM systems. In 2008 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP (pp. 3053-3056). [4518294] https://doi.org/10.1109/ICASSP.2008.4518294
Chin, Wen-Long ; Chen, Sau Gee. / A low-complexity symbol time estimation for OFDM systems. 2008 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP. 2008. pp. 3053-3056
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Chin, W-L & Chen, SG 2008, A low-complexity symbol time estimation for OFDM systems. in 2008 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP., 4518294, pp. 3053-3056, 2008 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP, Las Vegas, NV, United States, 08-03-31. https://doi.org/10.1109/ICASSP.2008.4518294

A low-complexity symbol time estimation for OFDM systems. / Chin, Wen-Long; Chen, Sau Gee.

2008 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP. 2008. p. 3053-3056 4518294.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Chin W-L, Chen SG. A low-complexity symbol time estimation for OFDM systems. In 2008 IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP. 2008. p. 3053-3056. 4518294 https://doi.org/10.1109/ICASSP.2008.4518294