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Window Function and Interpolation Algorithm for OFDM Frequency-Offset Correction

Overview In Orthogonal Frequency-Division Multiplexing (OFDM) digital communication systems, an uncorrected frequency offset can lead to a severe degradation of the system performance. This paper describes a technique to mitigate the influence of frequency offset on system performance by applying a weighted Discrete Fourier Transform (DFT) to a novel OFDM frequency-assignment scheme in which null carriers are regularly inserted among modulated data carriers. This frequency-assignment scheme makes possible the application of a window function at the demodulator to broaden the signal spectrum and renders the demodulated signal more immune to the influence of frequency offset. In addition, a variant of this frequency-assignment scheme also leads to a DFT-based measurement technique for easy and accurate determination of the frequency offset.

Further White Paper Details
Publisher	Institute of Electrical and Electronics Engineers	File Format	PDF
Date Published	May 2003
Format	White Papers
Topics	Wireless LAN, Mobile - Wireless Communications, Application Development

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