Process and method for wide band transmission, particularly for data transmission over an electricity distribution network
First Claim
1. A method for wideband transmission and reception of data over an electricity distribution network for use by a least a data transmitter and a data receiver thereon, the data taking the form of words made up of information elements which may take one of several values, comprising the steps of:
- (a) coding each information element for transmission by assigning a sequence of several different predetermined coding frequencies with a particular frequency combination being associated with each information element value, wherein the predetermined coding frequencies are divided into at least two distinct frequency bands which are spaced apart from each other and particular coding combinations are chosen such that frequencies ranking the same sequence place in the combinations occupy different frequency bands, and wherein at least some pairs of frequencies in corresponding sequence places of different information element values, and further wherein each information value contains frequencies in both said frequency bands;
(b) transmitting said coded information elements at said predetermined frequencies as an information signal over a communications channel on said network; and
(c) receiving said transmitted signal over said communications channel, comprising the steps of;
(i) applying the received signal to a pair of demdoulators, the demodulators being assigned to each of one of said respective frequency bands,(ii) generating local signals, said locally generated signals reproducing, with a substantially constant frequency shift, said particular frequency combinations,(iii) applying said locally generated signals to the demodulators, and(iv) correlating said received signal with said locally generated signals to determine the value of the received information element as a function of said correlation.
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Accused Products
Abstract
At transmission (10) each bit for transmission is coded as a function of its state by producing (12) a particular coding frequency combination, these being divided into two distinct bands spaced one from another and the coding combinations being chosen such that frequencies ranked in the same sequence place in these combinations do not occupy the same frequency band. A signal comprising the coding combination is injected to the network (N,P) and at reception (20), is applied to demodulators (22, 23), each assigned to one respective frequency band, to be correlated with locally generated signals (25, 26) which reproduce the coding combinations with a constant frequency shift, the bit state being determined (24) as a function of the correlation output.
51 Citations
11 Claims
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1. A method for wideband transmission and reception of data over an electricity distribution network for use by a least a data transmitter and a data receiver thereon, the data taking the form of words made up of information elements which may take one of several values, comprising the steps of:
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(a) coding each information element for transmission by assigning a sequence of several different predetermined coding frequencies with a particular frequency combination being associated with each information element value, wherein the predetermined coding frequencies are divided into at least two distinct frequency bands which are spaced apart from each other and particular coding combinations are chosen such that frequencies ranking the same sequence place in the combinations occupy different frequency bands, and wherein at least some pairs of frequencies in corresponding sequence places of different information element values, and further wherein each information value contains frequencies in both said frequency bands; (b) transmitting said coded information elements at said predetermined frequencies as an information signal over a communications channel on said network; and (c) receiving said transmitted signal over said communications channel, comprising the steps of; (i) applying the received signal to a pair of demdoulators, the demodulators being assigned to each of one of said respective frequency bands, (ii) generating local signals, said locally generated signals reproducing, with a substantially constant frequency shift, said particular frequency combinations, (iii) applying said locally generated signals to the demodulators, and (iv) correlating said received signal with said locally generated signals to determine the value of the received information element as a function of said correlation. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wideband transmission on an electricity distribution network system for transmission of information taking the form of words made up of information elements which may take one of several values, the system comprising:
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at least one transmitter comprising means for generating predetermined sequences of coding frequencies as a function of the value of information elements to be transmitted, wherein said coding frequencies are divided into at least two distinct frequency bands spaced one from another and particular coding combinations are chosen so that frequencies ranking the same sequence place are in different frequency bands, and wherein at least some pair sof frequencies in corresponding sequence places of different information element values are unique, and further wherein each information value contains frequencies in both said frequency bands; means for appling said coded information elements at said predetermined frequencies as an information signal to a communications channel; and a receiver coupled to said communications channels for receiving said information signal, the receiver comprising a local frequency generator for generating signals reproducing, with a substantially fixed frequency shift, said predetermined sequences, and at least a pair of demodulators, each demodulator being assigned to a respective one of said frequency bands and coupled to the communications channel by means of a band pass filter, said information signals and said locally generated signals being applied to said demodulator, and a logic circuit coupled to the outputs of the demodulators, said logic circuit including means for determining the value of received signals as a function of the successive output signals of the demodulators. - View Dependent Claims (8, 9, 10, 11)
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Specification