Detection of unoccupied frequency band

Details Detection of unoccupied frequency band Detection of unoccupied frequency band

2007-10-02

2011-10-25

Nguyen, Long (Department: 2816)

Telecommunications

Transmitter and receiver at separate stations

Optimum frequency selection

C455S067110

Reexamination Certificate

active

08045923

ABSTRACT:
An unoccupied frequency band (W) is detected in a telecommunications network by obtaining first values relating to a signal received (r(n)) for respective corresponding times, in this frequency band. Next, a compound signal is obtained in the form of vectors (Yn) respectively associated with these first values, each vector having M components resulting respectively from the products of the first value associated with said vector and M second values relating to the signal received respectively for M offset times (ti) shifted with respect to the time corresponding to said first value, M being a greater integer. Next, at least one first and one second energy vector (EL, EH) are determined, each containing M components corresponding respectively to energy values of the compound signal for the M offset times, respectively on a first frequency band and on a second frequency band, which are situated either side of a reference frequency. Finally, a decision is made as to whether said frequency band is unoccupied on the basis of a comparison of a distribution of the energy values of the compound signal over the first frequency band and of a distribution of the energy values of the compound signal over the second frequency band.

REFERENCES:
patent: 5311541 (1994-05-01), Sanderford, Jr.
patent: 6850576 (2005-02-01), Fujimura et al.
patent: 2002/0176386 (2002-11-01), Singh
patent: 2010/0105335 (2010-04-01), Ghozzi et al.
patent: WO 2004/021126 (2004-03-01), None

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