Cross Ambiguity Function Based Integer Frequency Offset Estimation for OFDM Systems

Provided by: Xider Games
Topic: Mobility
Format: PDF
Using only one training symbol, a novel Cross Ambiguity Function (CAF) based Integer Frequency Offset (IFO) estimator for OFDM systems is proposed. From the energy distribution characteristics of the ideal CAF, an energy-detection based metric is obtained. By designing a training symbol whose Ambiguity Function (AF) is a valid approximation of the ideal thumbtack-type AF, a high-accuracy and full-range IFO estimation can be achieved over frequency-selective fading channels. Furthermore, the adoption of the CAF expression in terms of time-domain signals keeps the complexity of the proposed algorithm at a relatively low level.

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