Method and system for detecting messages in the presence of noise

• US 20090132650A1
• Filed: 04/12/2005
• Published: 05/21/2009
• Est. Priority Date: 04/12/2005
• Status: Active Grant

• Current Assignee: ABB Schweiz AG (ABB Limited)
• Original Assignee: Power-One Italy S.p.A. (ABB Limited)
• Inventors: Vernia, Filippo, Tazzari, Davide
• Granted Patent: US 8,015,316 B2
• Time in Patent Office: Days
• US Class Current: 709/204
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 7/041 using special codes as synchronising signal
• CPC Class Codes: H04L 7/048 using the properties of error detecting or error correcting codes, e.g. parity as synchronisation signal

Abstract

Disclosed is a method for transmitting messages between a transmitter and a receiver on a channel on which noise may be present. The messages are constituted by a sequence of data and comprise an initial portion (header) containing data to allow recognition of the message, a central portion (body) containing the valid message to transmit and an end portion (tail) containing information to verify the completeness of the message. The method consists in inserting in the message header a signature obtained from the combination of a first fixed part and of a second validation part; and recognizing a valid message received by verifying whether the fixed part of the message received generates the same validation part.

Claims

1. A method for transmitting messages between a transmitter and a receiver on a channel on which there may be noise, wherein said messages are constituted by a sequence of data and comprise a header containing data to allow recognition of the message, a body containing the valid message to be transmitted and a tail containing information to verify the completeness of the message;

and wherein the receiver recognizes said messages by means of data contained in said header;

characterized by;

inserting in the message header a signature obtained from the combination of a first fixed part and of a second validation part;

and recognizing a valid message received by verifying whether the fixed part of the message received generates the same validation part.

2. Method as claimed in claim 1, characterized in that said validation part is obtained by applying a validation key, the same validation key being used by the transmitter to generate the validation part, and by the receiver to recognize said message.

3. Method as claimed in claim 1, characterized by:

transmitting a message, the header of which contains a fixed part, constituted by a first sequence of data, and a validation part, constituted by a second sequence of data obtained by applying a validation key to the data forming said first sequence;

and recognizing a valid message received from said receiver by applying the same validation key to the first sequence of data of the message received to generate with said key a third sequence of data and comparing the third sequence of data with the second sequence of data contained in the message received, the message being recognized when said third sequence of data and said second sequence of data coincide.

4. Method as claimed in one or more of the previous claims, characterized in that said validation part is obtained with a CRC algorithm applied to the fixed part.

5. Method as claimed in one or more of the previous claims, characterized in that said message is transmitted on a power distribution network by means of carrier waves.

6. Method as claimed in one or more of the previous claims, characterized in that the message header contains synchronization data.

7. Method as claimed in claim 6, characterized in that said synchronization data belong to said first part of the signature of the message.

8. Method as claimed in one or more of the previous claims, characterized in that the message header contains data to address the message to at least one determined recipient.

9. A message for the exchange of information between at least one transmitter and at least one receiver, constituted by a sequence of data and comprising:

a header containing data for recognition of the message;

a body containing the valid message to be transmitted; and

a tail containing information to verify the completeness of the message;

characterized in that said header contains a signature obtained from the combination of a first fixed part and of a second validation part.

10. Message as claimed in claim 9, characterized in that said validation part is obtained from the first fixed part by means of a CRC algorithm.

11. Message as claimed in claim 9 or 10, characterized in that it is incorporated in a carrier wave transmitted by means of carrier waves on a power distribution network.

12. Message as claimed in one or more of claims 9 to 11, characterized in that said header contains synchronization data.

13. Message as claimed in claim 12, characterized in that said synchronization data are part of the fixed part of said signature.

14. Message as claimed in one or more of claims 9 to 13, characterized in that said header contains identification data of at least one recipient of the message.

15. A message transmission system, comprising at least one transmitter and one receiver connected to each other by a transmission channel, wherein:

said transmitter is programmed to transmit on said channel messages comprising a header containing data to allow recognition of the message, a body containing the valid message to transmit and a tail containing information to verify the completeness of the message;

said receiver is programmed to receive on said channel sequences of data and recognize a valid message by means of the data contained in said header;

characterized in that;

said transmitter is programmed to insert in the initial portion of the message a signature obtained from combination of a first fixed part and of a second validation part; and

in that said receiver is programmed to recognize a valid message received by verifying whether the fixed part of the message received generates the same validation part.

16. System as claimed in claim 15, characterized in that said transmitter is programmed to generate said validation part by applying a validation key, the receiver being programmed to apply the same validation key to recognize said message.

17. System as claimed in claim 15, characterized in that:

said transmitter is programmed to transmit a message, the header of which contains a fixed part, constituted by a first sequence of data, and a validation part, constituted by a second sequence of data obtained by applying a validation key to the data forming said first sequence;

and said receiver is programmed to recognize a valid message received by applying the same validation key to the first sequence of data of the message received to generate with said key a third sequence of data and comparing the third sequence of data with the second sequence of data contained in the message received, the message being recognized when said third sequence of data and said second sequence of data coincide.

18. System as claimed in one or more of claims 15 to 18, characterized in that said channel is a power distribution network, and in that said at least one transmitter and said at least one receiver comprises a PLM for the transmission and/or reception of data on said channel by means of carrier waves.

19. System as claimed in one or more of claims 15 to 18, characterized in that said transmitter is programmed to insert in the message header a series of synchronization data, and said receiver is programmed to recognize said sequence of synchronization data.

20. A method to detect messages in the presence of noise, wherein a message emitted from a transmitter is detected by a receiver on the basis of a sequence of data at the start of said message, characterized in that said sequence of data comprises a sequence of fixed data and a sequence of validation data generated by said transmitter by applying a validation key to the sequence of fixed data, and in that the message is recognized by said receiver by applying the same validation key to the fixed sequence, verifying that said key generates a validation sequence the same as the validation sequence contained in the message received.