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Investigation of continuous change of α parameter in the interpolated DFT algorithm for cosα(X) windows

Barczentewicz S.

Measurement Automation Monitoring

2015

Vol. 61, No. 4

90--91

Currently known IpDFT algorithms use the cosα(X) windows with the step change of the window’s order. This work presents IpDFT method designed for the signal analyzed with cosα(X) window, which allows continuous change of the window’s parameter α, so that a full regulation of the sidelobes position becomes possible. Proposed algorithm is a generalization of known IpDFT solutions for cosα(X) windows.

Evaluation of features for the automatic recognition of OFDM signals in monitoring or cognitive receivers

Liedtke F., Albers U.

Journal of Telecommunications and Information Technology

2008

nr 2

30-36

The automatic recognition of signal types is an important task of monitoring receivers and also cognitive receivers. Several modulation recognition or classification procedures exist for single channel signal types while a simple robust procedure for automatic recognition of OFDM signals is lacking because of its numerous frequency channelslying close together. The task considered in this paper is the discrimination between OFDM (or multi-channel) signals and other signal types. The number of frequency channels of the OFDM signals is assumed to be unknown a priori. So, together with the automatic OFDM detection the estimation of the number of frequency channels is treated. Several discrimination features have been examined and the most promising ones are described: measures of the variation, of the skewness, of the kurtosis, and of the specific picket-fence shape of the spectrum which is typical for many OFDM signals. For a number of real-world OFDM samples, recorded from the high frequency range, results are presented. An automatic discrimination from single channel or noise like signals is achieved and the number of system channels can be estimated.