Electronic identification system with forward error correction system

• US 7,327,218 B2
• Filed: 06/24/2005
• Issued: 02/05/2008
• Est. Priority Date: 01/19/1998
• Status: Expired due to Fees

• Current Assignee: Zebra Technologies Corporation
• Original Assignee: ZIH Corp. (Zebra Technologies Corporation)
• Inventors: Turner, Christopher Gordon Gervase, Hohberger, Clive P
• Primary Examiner(s): Zimmerman; Brian
• Assistant Examiner(s): BROWN, VERNAL U
• Application Number:
  US11/166,439
• Publication Number:
  US 20050237155A1
• Time in Patent Office: 956 Days
• Field of Search: 340/10.1, 340/3.43, 340/10.41, 340/10.51, 340/3.44, 340/825.72, 340/825.69, 340/10.4, 340/10.3, 714/751, 714/752, 714/786, 714/792
• US Class Current: 340/10.1
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: G06K 7/10039 interrogator driven, i.e. synchronous

Abstract

An electronic radio frequency (RF) identification system 10 is disclosed and claimed. The system includes an interrogator 11 and a plurality of RF transponders 12.1 to 12.n. In use, each transponder is operative in response to an interrogation signal 14 to respond with a forward error correctable data message 16.1 including base data encoded as symbol characters in accordance with a forward error correcting code, such as a Reed Solomon Code, and check characters on the base data as defined in the forward error correcting code. The interrogator 11 utilizes data relating to the forward error correcting code, the symbol characters and check characters in the received forward error correctable data message, to reconstruct the base data in the event of corruption of the forward error correctable data message during transmission.

Claims

1. An electronic radio frequency identification system for correcting errors due to burst noise including:

an interrogator comprising a forward error correction code generator, wherein the interrogator is configured to transmit a radio frequency interrogation signal comprising a forward error correctable data message, the message including base data encoded as a set of symbol characters in accordance with a forward error correcting code and a set of check characters derived from the base data in accordance with the forward error correcting code, wherein the forward error correcting code is a member of a class of cyclic block codes;

a plurality of radio frequency transponders, wherein at least one of the plurality of radio frequency transponders is structured to receive the forward error correctable data message and respond by backscatter modulation of the forward error correctable data without reconstructing the forward error correctable data; and

wherein the interrogator further comprises a receiver for receiving the forward error correctable data message; and

a data processor programmed to utilize data relating to the forward error correcting code, the symbol characters and the check characters in the received forward error correctable data message, to reconstruct the transponder identifying base data even despite burst noise error corruption of the received forward error correctable data message.

2. An electronic radio frequency identification system as claimed in claim 1 wherein the forward error correcting code is a Bose-Chaudauri-Hocquenghem Code.

3. An electronic radio frequency identification system as claimed in claim 1 wherein the forward error correcting code is a Reed-Solomon Code.

4. An electronic radio frequency identification system as claimed in claim 1

wherein at least one transponder includes:

a data memory arrangement into which the forward error correctable data message received by the transponder is stored; and

control circuitry for causing the transponder to respond with the stored forward error correctable data message in response to the interrogation signal.

5. A method of operating an electronic radio frequency identification system for correcting errors due to burst noise including an interrogator and at least one transponder;

the method including the steps of;

causing an interrogation signal to be transmitted by the interrogator, wherein the interrogation signal includes a forward error correctable data message, the forward error correctable data message including base data encoded as a set of symbol characters in accordance with a forward error correcting code that is a member of a class of cyclic block codes, and a set of check characters derived from the base data in accordance with the forward error correcting code for facilitating reconstruction of the base data by the interrogator even despite burst error noise corruption of the forward error correctable data message;

causing the transponder to respond by backscatter modulation of the interrogation signal without reconstructing the forward error correctable data message;

receiving the backscatter modulated forward error correctable data message at the interrogator; and

causing an error correction means to utilize data relating to the forward error correcting code, the set of symbol characters and the set of check characters in the received backscatter modulated forward error correctable data message, in order to reconstruct the base data even despite burst error noise corruption of the received backscatter modulated forward error correctable data message.

6. The method of operating an electronic radio frequency identification system as recited in claim 5, wherein the forward error correcting code is a Bose-Chaudauri-Hocquenghem Code.

7. The method of operating an electronic radio frequency identification system as recited in claim 5, wherein the forward error correcting code is a Reed-Solomon Code.