SNR Estimation in Frequency Domain

Dae-Ki HONG  Cheol-Hee PARK  Min-Chul JU  Jin-Woong CHO  

Publication
IEICE TRANSACTIONS on Communications   Vol.E86-B   No.3   pp.1174-1176
Publication Date: 2003/03/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Terrestrial Radio Communications
Keyword: 
SNR,  DFT,  circular convolution,  frequency offset,  

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Summary: 
Beaulieu has proposed four signal-to-noise ratio (SNR) estimators for quadrature phase shift keying (QPSK) signaling in time domain. In this letter, we propose SNR estimators for QPSK signaling in frequency domain. A discrete Fourier transform (DFT) algorithm is used for the frequency domain analysis of the received signal. The frequency spectrum enables biased SNR estimation in the frequency domain. Circular convolution is used for robust and fast SNR estimation when the received signal exhibits a frequency offset. Simulation results show that the new estimators present good performance even when the received signal exhibits a large frequency offset.