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The effect of diversity on a burst-mode carrier-frequency estimator in the frequency-selective multipath channel

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2 Author(s)
Hebley, M.G. ; Dept. of Electr. & Electron. Eng., Canterbury Univ., Christchurch, New Zealand ; Taylor, D.P.

This paper describes a carrier-frequency offset estimator derived using maximum-likelihood techniques. The estimator is designed for a digital space-diversity receiver, operating in a wide-band frequency-selective multipath fading channel. The estimator is suited to a burst-mode time-division-multiple-access system, because the estimate is formed in an open-loop manner, and relies on a training sequence normally used in burst-mode systems. The main advantage is that it does not require channel state information; rather, it only requires knowledge of the auto-correlation of the channel. Simulation results show the estimator to be unbiased over a wide frequency range. The normalized error standard deviation is shown to be 0.0015 across the frequency offset range for a receiver with four diversity branches, when the normalized channel delay spread is 0.1, the signal-to-noise ratio (SNR) is 10 dB, and the training sequence length is 23 symbols. It is found that, for most parameter configurations, there is approximately a factor of two improvement in the estimate error standard deviation when the antenna diversity is doubled

Published in:

Communications, IEEE Transactions on  (Volume:46 ,  Issue: 4 )

Date of Publication:

Apr 1998

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