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

fYear

2010

Firstpage

172

Lastpage

176

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/PIMRC.2010.5671916

Filename

5671916