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Blind Frequency Offset Correction Algorithm for DWMT System
Yang CAO Qiang TU Xiuming SHAN Yong REN
Publication
IEICE TRANSACTIONS on Communications
Vol.E87B
No.12
pp.36953701 Publication Date: 2004/12/01 Online ISSN:
DOI: Print ISSN: 09168516 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: DWMT, OFDM, subcarrier frequency offset, blind estimation,
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Summary:
Discrete Wavelet Multicarrier Transceiver (DWMT) system, which can be viewed as a kind of OFDM, has many advantages because it uses wavelets as its base functions. In this paper we present a new subcarrier frequency offset correction method for DWMT systems with little assistant information. The essential ideal of this algorithm is: when an orthogonal multicarrier system is of perfect frequency synchronize, the demodulated signals of different subcarriers are independent of each other. Whereas when frequency offset exists, intercarrier interference will distort the demodulated signal, i.e. every demodulated signal is the sum of several modulated signals' projects on the demodulating frequency. So the adjacent demodulated signals consist of the element of the same modulated signal, and these demodulated signals are correlated with each other. The degree that they correlated with each other depends on subcarrier relative frequency offset. Since that little assistant information is used in this algorithm the spectrum efficiency can be largely increased. Simulation results shown that if the number of the subcarrier of the DWMT system is bigger than 1000, the relative frequency offset can be limited in 2%.


