Method and modem for adaptive allocation of the pilot carrier in a multi-carrier system
First Claim
Patent Images
1. A method for selecting a pilot carrier among a set of carriers carrying data to be transmitted between two stations in a telecommunication system, said pilot carrier being used for synchronisation between said two stations, characterized in that said method comprises the steps of:
- a) determining noise on each carrier in said set of carriers at initialisation of said system;
b) selecting, by means of a predetermined noise criterion to be fulfilled, said pilot carrier within said set of carriers;
c) repetitively determining noise on each said carrier during normal operation of said system; and
d) selecting another pilot carrier within said set of carriers whenever said predetermined noise criterion is no longer fulfilled by said pilot carrier.
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Abstract
In a multi-carrier system, the pilot carrier which is transmitted between two stations for synchronisation purposes, is re-allocated to a new frequency whenever it is disturbed by noise or a single frequency disturber in the vicinity thereof. A less noisy frequency is selected by means of a specific criterion to be fulfilled, for instance based on signal to noise ratio measurements performed for all carriers in the multi-carrier system.
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Citations
6 Claims
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1. A method for selecting a pilot carrier among a set of carriers carrying data to be transmitted between two stations in a telecommunication system, said pilot carrier being used for synchronisation between said two stations, characterized in that said method comprises the steps of:
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a) determining noise on each carrier in said set of carriers at initialisation of said system; b) selecting, by means of a predetermined noise criterion to be fulfilled, said pilot carrier within said set of carriers; c) repetitively determining noise on each said carrier during normal operation of said system; and d) selecting another pilot carrier within said set of carriers whenever said predetermined noise criterion is no longer fulfilled by said pilot carrier. - View Dependent Claims (2, 3, 4)
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5. A pilot carrier allocation device (PAD) for selecting a pilot carrier among a set of carriers carrying data to be transmitted between two stations in a telecommunications system, characterized in that said pilot carrier allocation device (PAD) comprises:
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a) noise determining means (NOIS) adapted to determine noise on each of said carriers; b) selecting means (SEL) adapted to select, by means of a predetermined noise criterion to be fulfilled, said pilot carrier within said set of carriers; and c) communication means (COM) adapted to generate pilot carrier information indicating which carrier has been selected by said selecting means (SEL) to be said pilot carrier.
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6. A multi-carrier modem (MODEM) including a modulating device (MOD), coupled between a data input (DI) and a line output (LO) of said modem (MODEM) and adapted to modulate data (D) on a set of carriers to be transmitted between two stations in a telecommunications system, a demodulating device (DEM), coupled between a line input (LI) and a data output (DO) of said modem (MODEM) and adapted to demodulate data carried by said set of carriers, and a pilot carrier allocation device (PAD) adapted to select a pilot carrier within said set of carriers characterized in that said pilot carrier allocation device (PAD) comprises:
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a) noise determining means (NOIS) adapted to determine noise on each carrier in said set of carriers; b) selecting means (SEL) adapted to select, by means of a predetermined noise criterion to be fulfilled, said pilot carrier within said set of carriers; and c) communication means (COM) adapted to generate pilot carrier information indicating which carrier has been selected by said selecting means (SEL) to be said pilot carrier.
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Specification