Data recovery method and apparatus for radio frequency identification

• US 8,542,101 B2
• Filed: 10/25/2006
• Issued: 09/24/2013
• Est. Priority Date: 06/29/2006
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Koo, Ji-hun, Kang, Woo-shik, Park, Kyung-ho
• Primary Examiner(s): Mehmood, Jennifer
• Assistant Examiner(s): POINT, RUFUS C
• Application Number:
  US11/585,982
• Publication Number:
  US 20080001719A1
• Time in Patent Office: 2,526 Days
• Field of Search: 340/10.1, 340/10.2, 340/10.4, 340/825.58, 340/825.7, 340/825.71, 340/825, 340/825.73, 340/13.26, 375/329
• US Class Current: 340/10.2
• 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

Abstract

Provided are an RFID reader and a data recovery method which selectively selects only an integrity-checked phase signal, when receiving a backscattered signal of an RFID tag through an I signal path or a Q signal path, and may reduce a shadow area of a read range. The RFID reader includes a signal receiver which receives a plurality of phase signals; a symbol detector which recovers data with respect to each of the received phase signals; and a signal selector which selects a signal that satisfies a predetermined standard, from the data-recovered phase signals.

Claims

1. A radio frequency identification (RFID) reader comprising:

a signal receiver of the RFID reader, which receives a plurality of phase signals;

a symbol detector which recovers data with respect to each of the received phase signals; and

a signal selector which selects a signal that satisfies a predetermined standard, from the data-recovered phase signals,

wherein the predetermined standard is satisfied by the signal selector selecting a phase signal which comprises an integrity-checked preamble signal of each of an I signal path and a Q signal path.

2. The RFID reader of claim 1, wherein the symbol detector tracks a symbol from each of the received phase signals, and recovers the tracked symbol by using a predetermined pattern matching method.

3. The RFID reader of claim 2, further comprising:

a preamble checker which checks the integrity of the recovered data.

4. The RFID reader of claim 3, wherein the preamble checker detects a preamble signal from the recovered symbol, and checks the integrity.

5. The RFID reader of claim 3, wherein the signal selector selects the integrity-checked phase signal from the plurality of phase signals.

6. The RFID reader of claim 1, wherein each of the received phase signals comprises an I phase signal and a Q phase signal.

7. A data recovery method comprising:

receiving, at a radio frequency identification (RFID) reader, a plurality of phase signals;

recovering data with respect to each of the received phase signals; and

selecting a signal, which satisfies a predetermined standard, from the data-recovered phase signals,

wherein the predetermined standard is satisfied by selecting a phase signal which comprises an integrity-checked preamble signal of each of an I signal path and a Q signal path.

8. The method of claim 7, wherein the recovering comprises:

tracking a symbol from the plurality of phase signals; and

recovering the tracked symbol by using a predetermined pattern matching method.

9. The method of claim 8, further comprising checking the integrity with respect to the recovered data.

10. The method of claim 9, wherein the checking comprises detecting a preamble signal from the recovered symbol.

11. The method of claim 9, wherein the selecting selects the integrity-checked phase signal from the plurality of phase signals.

12. The method of claim 7, wherein each of the phase signals comprises an I phase signal and a Q phase signal.

13. A non-transitory computer-readable recording medium storing a program for implementing a method comprising:

receiving, at a radio frequency identification (RFID) reader a plurality of phase signals;

recovering data with respect to each of the received phase signals; and

selecting a signal which satisfies a predetermined standard, from the data-recovered phase signals,

wherein the predetermined standard is satisfied by selecting a phase signal which comprises an integrity-checked preamble signal of each of an I signal path and a Q signal path.