System for transmitting digital data over an electricity power line
First Claim
1. A system for transmitting digital data over a line in an electricity power network, the system comprising transmitter means suitable for transmitting data over a plurality of predetermined frequency bands, and receiver means suitable for receiving data on any of said bands, wherein the transmitter means, at least when setting up a new call with the receiver means, is adapted to transmit data in the form of a message preceded by a synchronizing preamble and to commence transmission of the synchronizing preamble over each of the frequency bands;
- and wherein the receiver means comprise;
preprocessor means arranged to receive and process any signal transmitted on any of the reception bands included within said predetermined frequency bands in particular to receive and process the synchronizing preamble over whichever band or bands are used by the transmitter;
synchronizing means connected to said preprocessor means to detect a predetermined sequence contained in the synchronizing preamble;
adaptation means for selecting a message reception band out of any of the bands; and
evaluation means operating under the control of the synchronizing means to provide the adaptation means with a criterion for evaluating the transmission of data in any selected reception band;
the adaptation means using said criterion to select and designate as the message reception band a reception band that offers adequate transmission quality.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention relates to a communications system suitable for application directly to a national electricity grid and comprising a transmitter for transmitting data over a plurality of transmission frequency bands, a receiver for receiving messages over any one of the frequency bands, means for evaluating the transmission quality of each of the frequency bands, and a way to adapt the system for transmitting and receiving over the frequency band that has optimum transmission quality. The system of the invention may be applied, in particular, to remote reading of electricity meters.
69 Citations
10 Claims
-
1. A system for transmitting digital data over a line in an electricity power network, the system comprising transmitter means suitable for transmitting data over a plurality of predetermined frequency bands, and receiver means suitable for receiving data on any of said bands, wherein the transmitter means, at least when setting up a new call with the receiver means, is adapted to transmit data in the form of a message preceded by a synchronizing preamble and to commence transmission of the synchronizing preamble over each of the frequency bands;
- and wherein the receiver means comprise;
preprocessor means arranged to receive and process any signal transmitted on any of the reception bands included within said predetermined frequency bands in particular to receive and process the synchronizing preamble over whichever band or bands are used by the transmitter;
synchronizing means connected to said preprocessor means to detect a predetermined sequence contained in the synchronizing preamble;
adaptation means for selecting a message reception band out of any of the bands; and
evaluation means operating under the control of the synchronizing means to provide the adaptation means with a criterion for evaluating the transmission of data in any selected reception band;
the adaptation means using said criterion to select and designate as the message reception band a reception band that offers adequate transmission quality. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- and wherein the receiver means comprise;
Specification