| Patent application number | Description | Published |
|---|
| 20080298489 | METHOD FOR ESTIMATING THE CHARACTERISTCS OF OFDM SIGNALS - This invention relates to a method for determining at least one characteristic of an OFDM signal within a received signal, characterised in that:
| 12-04-2008 |
| 20080299918 | Cognitive radio terminal - A cognitive telecommunication terminal designed to coexist with a primary telecommunication system using a set (B) of transmission frequencies comprising a plurality of spatially distributed transmitters, each transmitter being suitable for transmitting within a coverage area in a plurality of frequency bands in said set allocated to the transmitter. The terminal comprises positioning means, a database storing information defining the coverage area for each transmitter, calculation means suitable for determining the maximum power that the terminal can transmit for each frequency band in said set, and for sorting frequency bands as a function of the maximum powers thus obtained. Finally, the terminal comprises radio transmission/reception means suitable for detecting the presence of a signal in the frequency bands thus sorted, beginning with the frequency band associated with the highest maximum power. | 12-04-2008 |
| 20090067521 | BLIND ESTIMATION METHOD OF OFDM MODULATION PARATMETERS - The present invention concerns a blind estimation method of at least one temporal modulation parameter of an OFDM signal, in which a plurality of demodulation attempts of said OFDM signal are carried out using a plurality of respective values of this temporal parameter and, for each demodulation attempt, a cost function representative of the entropy of the demodulated signal is calculated, the estimate of said temporal parameter then being obtained as the value of this parameter minimising said cost function. | 03-12-2009 |
| 20090111478 | METHOD OF SEARCHING FOR FREE BAND FOR A COGNITIVE TELECOMMUNICATION TERMINAL - This invention relates to a method of searching for free band using a cognitive telecommunication terminal operating in a zone covered by a primary telecommunication system using a plurality of frequency bands (B). The terminal classifies said bands as a function of their conditional probabilities of being available (p(b | 04-30-2009 |
| 20090296841 | METHOD FOR DETECTING AN OFDM SIGNAL - The present invention relates to a method for detecting the presence of an OFDM signal in a received signal wherein said received signal is down converted into baseband and subjected to a passband filtering corresponding to a band of interest before being sampled. The thus sampled signal is subjected to a second filtering for eliminating at least one interfering line in the band of interest. The presence of an OFDM signal is detected if the signal filtered by the second filtering is cyclostationary. | 12-03-2009 |
| 20100189161 | METHOD FOR DETECTING THE PRESENCE OF SPREAD SPECTRUM SIGNALS - The present invention relates to a method for detecting the presence or the absence of a spread spectrum signal in a frequency band of interest of a received signal, wherein:
| 07-29-2010 |
| 20100195705 | METHOD FOR DETECTING CYCLOSTATIONARY SIGNALS - A method for detecting a cyclostationary signal in a signal to be analyzed, received from a transmitter by a receiver or read from a recording medium by a reader device. According to this method, the value of a discrimination function J is estimated, expressed as a quadratic form of the cyclic correlation coefficients of the signal to be analyzed for a set (I* | 08-05-2010 |
| 20110228830 | METHOD FOR THE ESTIMATION OF OFDM PARAMETERS BY ADAPTATION OF COVARIANCE - This invention relates to a method for the blind or semi-blind estimation of at least one modulation parameter of an OFDM signal utilising a method for adapting the covariance. According to this method, a plurality of values of this parameter are tested by calculating, for each of these values, a distance between a covariance matrix of vectors composed of samples of the signal and a theoretical covariance matrix. The estimated value of the parameter is the tested value which achieves the shortest distance. Said method provides a very good rate of good estimates, even when the OFDM prefix is short or absent. Furthermore, it makes it possible to obtain a joint estimation of several time parameters and, where applicable, of the signal-to-noise ratio. | 09-22-2011 |
