Centre National De La Recherche Scientifique

Université De Rennes 1

Institut National Des Sciences Appliquees De Rennes

Institut National Des Sciences Appliquees (Insa)

Institut National Des Sciences Appliquees

Philippe Mary

Christophe Moy

Christian Brousseau

Navikkumar Modi

Adbullah Haskou

A method of opportunistic access to a frequency band dedicated to a synchronous primary network by a secondary user. The frequency band is divided into K independent channels to which an indicator Band an average availabilityare assigned. At each time frame t, the method includes observing, by the secondary user, the channel i having the greatest indicator B(t); and if the channel i is busy, updating the average availabilityof channel i and updating indicator B(t) of the channel as a function of, and if the channel i is free: updating the average availabilityof channel i, transmitting data set up during the frame t on channel i, computing a quality index R(t) of channel i, and updating indicators B(t) of the K channels as a function of the average availabilitiesand R(t).

Method for opportunistic access to the spectrum

A method is provided for transmitting a sequence of data symbols including at least two data symbols of distinct values, delivering an electromagnetic wave carrying an orbital angular momentum. The method includes, for at least one data symbol to be transmitted: a bijective selection of an order of orbital angular momentum associating, with each distinct value of a data symbol, a distinct order of orbital angular momentum, and delivering a selected order of orbital angular momentum that is representative, by bijection, of the value of the at least one data symbol to be transmitted; and transmitting the electromagnetic wave carrying an orbital angular momentum, the order of orbital angular momentum of which corresponds to the selected order of orbital angular momentum.

Method for transmitting a sequence of data symbols, corresponding device for transmission, signal, method for receiving, device for receiving and computer program

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Cesson-Sevigne, France

Philippe Mary