Pilot signal design algorithm for efficient symbol time offset estimation in an OFDM system

Authors:
Seo Bin Hong;Hyung-Myung Kim
Affiliations:
Department of EE, KAIST, Daejon, Republic of Korea;Department of EE, KAIST, Daejon, Republic of Korea
Venue:
Signal Processing
Year:
2007

Citing 2
Cited 1

ML estimation of time and frequency offset in OFDM systems

IEEE Transactions on Signal Processing
Pilot tone selection for channel estimation in a mobile OFDM system

IEEE Transactions on Consumer Electronics

Compressed sensing techniques for receiver based post-compensation of transmitter's nonlinear distortions in OFDM systems

Signal Processing

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Abstract

This paper presents novel pilot signal design algorithms for efficient symbol time offset estimation in an OFDM system. Evenly spaced pilot signals in the frequency-domain have large correlation in the time-domain, and the ML function of the symbol time offset estimator induces an inaccurate value of time offset. Novel pilot signal design algorithms-Sine Algorithm, Shift Algorithm, and Sine and Shift Algorithm-are developed in terms of positions and values of pilot signals so that the accuracy of the symbol time offset estimator can be improved. Simulation results show that these algorithms decrease the variance of estimate, especially in a time dispersive channel, improving the system performance.