A FREQUENCY ACQUISITION SCHEME FOR OFDM SYSTEMS

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This paper drives a frequency acquisiton algorithm for orthogonal frequency division multiplexing(OFDM) systems.This frequency acquisition algorithm is a mod-ification of the frequency tracking algorithm introduced in[1],which uses a repeated data symbol and a maximum likelihood estimation(MLE) algorithm to estimate the frequency offset. The esimate is extremely accurate but the acquisition range is limited to +- 1/2 of the intercarrier spacing .With some modifications of the multipath channel introduced in this paper,the frequency acquisition can be converted to an analogous PN sequence acquistion problem.Therefore, a partial-sum correlator with an appropriate threshold can be used to acquire the frequency offset.

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