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The integer frequency offset can be obtained by detecting the shift of the vector norm of the pilots, because the vector norm is maximum at the position of the pilots. The performance of the proposed algorithm is compared with that of conventional algorithms.
A Two-Level Cooperative OFDM Frequency Offset Estimation Method Based on Adaptive Weighting and Multiple Candidate Search
This invention discloses a two-level collaborative OFDM frequency offset estimation method using adaptive weighting and multi-candidate search, comprising the following steps: preprocessing the received OFDM signal; calculating the real-time signal-to-noise ratio (SNR) of each received frame in the preprocessed OFDM signal; determining an initial fractional frequency offset estimate using an edge sampling and adaptive weighting method; performing integer frequency offset estimation on the frequency domain signal after fractional frequency offset pre-compensation using an energy window-based multi-candidate mechanism and correcting the window length of the fractional frequency offset estimate to obtain the final window length of the fractional frequency offset estimate; performing fractional and integer frequency offset estimation again using the final window length to obtain the final fractional and integer frequency offset estimates; and obtaining the final joint frequency offset estimate using a weighted fusion strategy. The method of this invention can significantly improve the accuracy of frequency offset estimation.
Owner:CHONGQING UNIV OF TECH