Cyclic Correlation-Based Blind SNR Estimation for Cyclic Prefix-Less OFDM System

This paper tackles the problem of the signal-to-noise ratio estimation for cyclic prefix (CP)-Less orthogonal frequency division multiplexing (OFDM) system in the presence of Gaussian noise over multipath fading channels. First, we introduce the cyclic correlation of the CP-Less OFDM signal with CP, and analyze the cyclic correlations for Gaussian noise and received signal. Second, we isolate the Gaussian noise power from the signal power. Finally, we obtain the close form expression of SNR estimation by using cyclic correlations. Computer simulation results verify the effectiveness of the proposed method.