Title :
An improved preamble-based SNR estimation algorithm for OFDM systems
Author :
Zivkovic, Milan ; Mathar, Rudolf
Author_Institution :
Inst. for Theor. Inf. Technol., RWTH Aachen Univ., Aachen, Germany
Abstract :
A crucial parameter required for adaptive transmission in orthogonal frequency division multiplexing (OFDM) systems is the signal-to-noise ratio (SNR). In this paper, certain modifications to previously proposed preamble-based SNR estimator for wireless OFDM systems are suggested in order to improve estimation performance. Proposed modifications, related to DFT interpolation, are based on the adaptive selection of significant channel impulse response (CIR) paths utilizing the average noise power estimate obtained in frequency domain. The modified estimator shows performance improvement of average SNR estimation in low SNR regime and considerably outperforms original algorithm for SNR per subcarrier estimation.
Keywords :
OFDM modulation; channel estimation; discrete Fourier transforms; frequency-domain analysis; interpolation; transient response; DFT; OFDM systems; SNR estimation algorithm; adaptive transmission; channel impulse response; frequency domain; interpolation; orthogonal frequency division multiplexing; signal-to-noise ratio; subcarrier estimation; Channel estimation; Estimation; Frequency domain analysis; OFDM; Signal to noise ratio; Synchronization;
Conference_Titel :
Personal Indoor and Mobile Radio Communications (PIMRC), 2010 IEEE 21st International Symposium on
Conference_Location :
Instanbul
Print_ISBN :
978-1-4244-8017-3
DOI :
10.1109/PIMRC.2010.5671916
