RFID reader and circuit and method for echo cancellation...

Details RFID reader and circuit and method for echo cancellation... RFID reader and circuit and method for echo cancellation...

2011-07-26

2011-07-26

Nguyen, Duc (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S418000, C455S570000, C379S406080

Reexamination Certificate

active

07986931

ABSTRACT:
An echo cancellation circuit for an RFID reader and the method thereof are provided. The echo cancellation circuit includes a gain calculator, a gain adjustment circuit, and a subtraction circuit. The gain calculator provides a complex gain value according to a carrier signal and a received signal through an adaptive algorithm. The gain adjustment circuit is coupled to the gain calculator. The gain adjustment circuit multiplies the carrier signal by the complex gain value, and outputs the result of the multiplication. The subtraction circuit is coupled to the gain adjustment circuit. The subtraction circuit subtracts the output of the gain adjustment circuit from the received signal, and then provides the result of the subtraction as the output signal of the echo cancellation circuit.

REFERENCES:
patent: 5572545 (1996-11-01), Hachem et al.
patent: 2002/0191779 (2002-12-01), Pham
patent: 2006/0098765 (2006-05-01), Thomas et al.
“1st Office Action of China counterpart application”, issued on Jan. 22, 2010, p. 1-p. 4.
Article Titled “A Robust Variable Step-Size LMS-Type Algorithm: Analysis and Simulations” jointly authored by Aboulnasr et al., IEEE Transactions on Signal Processing, vol. 45, No. 3, Mar. 1997.(pp. 631-639).

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