Abstract
Orthogonal frequency-division multiplexing (OFDM) overlay systems have recently been proposed to improve spectral efficiency and to meet growing demands for higher data rates in mobile communications. The successful deployment of overlay systems depends largely on the capability of secondary users to avoid collisions with primary users. In this paper, we propose a blind estimation algorithm for a secondary user to estimate the bandwidth and transmission parameters of the primary signal in an OFDM overlay system, using only the available fast Fourier transform (FFT) component of the secondary user. The algorithm does not require any a priori knowledge of the primary signal or the environmental noise. Parameters of the primary OFDM signal that can be estimated include the carrier frequency, number of sub carriers, data symbol duration, and length of cyclic prefix. Simulation results show that our proposed algorithm outperforms existing blind estimation methods especially in low signal-to-noise ratio (SNR) regions.
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