A COMPUTATIONALLY EFFICIENT METHOD OF TIMING AND PHASE ESTIMATION IN TDMA SYSTEMS USING A PREAMBLE SEQUENCE

Optimum and near optimum methods of burst parameter estimation based o n the discrete Fourier transform are presented. The methods are applic able to single sample per symbol demodulators when the burst preamble is chosen to be a discrete frequency component at one quarter of the s ymbol rate. The proposed methods do not require the squaring of the si gnal, and hence avoid the loss associated with squaring the noise comp onents. The optimum method is shown to reach the Cramer-Rao bound for symbol timing and carrier phase estimation for the chosen preamble, wh ereas the more computationally efficient method shows a loss of 1.0dB and yields information regarding the timing offset only. The performan ces of the two methods in the presence of carrier frequency offset and additive white Gaussian noise are analysed, and implementations are g iven together with a comparison of the respective computational comple xities.