Patent ID: 8675745
Filing Date: 2014-03-18
Classification: H04B,H04J,H04L

Abstract:
1. A method for detecting a presence of an OFDM signal, said method comprising: obtaining a signal; subjecting said signal to a frequency down converting into baseband, passband filtering corresponding to a band of interest before being sampled, and then sampling to generate a sampled signal; determining interfering line(s) by calculating a spectral density of the sampled signal, a mean value m and a variance σ obtaining elementary transfer functions of a set of band-stop filters by determining for each point x in the spectrum whereof the spectral density value exceeds m+λσ subjecting the thus sampled signal to a second filtering by using said set of band-stop filters for eliminating the interfering line(s) in the band of interest; and detecting the presence of an OFDM signal by checking whether the signal filtered by the second filtering is cyclostationary.