Patent ID: 11916566
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An NFC device comprising:
an antenna which receives a data frame which includes a start pattern including first and second pattern signals modulated by a sub-carrier frequency and that are succeedingly input in the time domain, and a data pattern corresponding to the start pattern;
an analog-to-digital converter which samples the first pattern signal at a sampling period to generate a first input signal, and samples the second pattern signal at the sampling period to generate a second input signal; and
a modem which receives the first input signal and the second input signal, and determines reception of the start pattern on the basis of the first input signal and the second input signal,
wherein the modem includes a first sub-matched filter which multiplies a first match signal generated on the basis of the sampling period by the first input signal to calculate a first result value of the first match signal and multiplies the first match signal by the second input signal to calculate a second result value of the first match signal, and a second sub-matched filter which multiplies a second match signal that is based on the sampling period and has a phase different from the first match signal by the first input signal to calculate a first result value of the second match signal, and multiplies the second match signal by the second input signal to calculate a second result value of the second match signal, and
the first sub-matched filter determines reception of the start pattern when the first result value of the first match signal and the second result value of the first match signal exceed a predetermined start pattern threshold or when the first result value of the second match signal and the second result value of the second match signal exceed the predetermined start pattern threshold.