Method of analyzing the spectrum of a radio communication system transmission signal
OwnerOlivier Danetinventor
Life of this patent
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Abstract
In a method of analyzing the spectrum of a radio communication system transmission signal having a given carrier frequency, the transmission signal is split to obtain first and second intermediate signals. A phase-shift at the given carrier frequency is applied to at least one of the intermediate signals so that at that frequency the intermediate signals have a relative phase difference of 180°. The phase-shifted intermediate signals are recombined to form a recombined signal in which the signal part transmitted at the given carrier frequency is rejected and the spectrum of the recombined signal is analyzed.
Claims10
A method of analyzing the spectrum of a radio communication system transmission signal having a given carrier frequency, wherein:
- said transmission signal is split to obtain first and second intermediate signals;
- a phase-shift at said given carrier frequency is applied to at least one of said intermediate signals so that at that frequency said intermediate signals have a relative phase difference of 180°;
- the phase-shifted intermediate signals are recombined to form a recombined signal in which the signal part transmitted at said given carrier frequency is rejected;
- and
- the spectrum of the recombined signal is analyzed.
A device for analyzing the spectrum of a radio communication system transmission signal having a given carrier frequency, including:
- a circuit receiving at its input said transmission signal and adapted to reject in said transmission signal the signal part which is transmitted at said carrier frequency, said circuit including
- splitter means for splitting said transmission signal into two intermediate signals;
- phase-shifter means for applying a phase-shift to at least one of said intermediate signals at said carrier frequency so that at that frequency said intermediate signals have a relative phase difference of 180°;
- and
- recombining means for recombining the two phase-shifted intermediate signals to form a recombined signal in which said signal part at said carrier frequency is rejected;
- said recombination means being connected to said splitter means by two transmission channels each carrying one intermediate signal;
- and
- a spectrum analyzer connected to said circuit to receive said recombined signal to be analyzed.
Dependencies are inferred from the claim text.