IC card, IC card processor and IC card system to improve data transmission speed

• US 20050092847A1
• Filed: 10/20/2004
• Published: 05/05/2005
• Est. Priority Date: 11/05/2003
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Yong-Wook
• Granted Patent: US 7,344,087 B2
• Time in Patent Office: Days
• US Class Current: 235/492
• 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: H04L 27/361 Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation
• CPC Class Codes: H04L 27/389 with separate demodulation for the phase and amplitude components

Abstract

An IC card system for transceiving data signal between an IC card processor and an IC card in the manner of non-contact are provided. The IC card modulates the signal to be transmitted to the processor in the manner of Quadrature Amplitude Modulation and generates the modulated signal. A card reader demodulates the signal received from the IC card in the manner of QAM. The rate of the data signal transmitted from the IC card to the card reader is improved.

Claims

1. An IC card comprising:

a signal processing circuit;

a modulator for performing Quadrature Amplitude Modulation (QAM) on a data signal received from the signal processing circuit and generating a transmission signal; and

an antenna for transmitting the transmission signal modulated by the modulator.

2. The IC card of claim 1, wherein the modulator comprising:

a serial-parallel converter for converting a serial signal received from the signal processing circuit to a parallel signal;

a first level converter for converting a level of a first channel signal received from the serial-parallel converter; and

a first multiplier for modulating the level-converted signal received from the first level converter with a first carrier wave signal and outputting a first modulating signal;

a second level converter for converting a level of a second channel signal from the serial-parallel converter;

a second multiplier for modulating the level-converted signal from the second level converter with a second carrier wave signal and outputting a second modulating signal; and

a synthesizer for synthesizing the first modulating signal from the first multiplier and the second modulating signal from the second multiplier.

3. The IC card of claim 2, further comprising:

a carrier wave extractor for extracting the first carrier wave signal from a reception signal received from the antenna; and

a phase shifter for generating the second carrier wave signal by shifting the phase of the first carrier wave signal.

4. The IC card of claim 1, further comprising:

a demodulator for demodulating a reception signal received by the antenna and providing the demodulated data signal to the signal processing circuit.

5. The IC card of claim 4, wherein the demodulator performs an Amplitude Shift Keying (ASK) 10% modulation and a Non-Return to Zero (NRZ) coding according to a standard of ISO/IEC B type.

6. An IC card processor, comprising:

a signal processing circuit;

an antenna; and

a demodulator for demodulating a reception signal received by the antenna in the manner of Quadrature Amplitude Modulation (QAM) and providing the demodulated data signal to the signal processing circuit.

7. The IC card processor of claim 6, wherein the demodulator comprises:

a first multiplier for multiplying the reception signal received by the antenna by a first signal;

a first level converter for converting a level of the signal from the first multiplier;

a second multiplier for multiplying a signal received by the antenna by a second signal;

a second level converter for converting a level of signals outputted from the second multiplier; and

a serial-parallel converter for receiving a signal from the first and second level converters to output a serial signal, wherein the serial signal is restored from the signal transmitted from the IC card.

8. The IC card processor of claim 6, further comprising:

a generator for generating the first signal of a predetermined frequency; and

a phase shifter for generating the second signal by shifting a phase of the first signal.

9. The IC card processor of claim 6, further comprising:

a modulator for modulating a signal to transmit to the IC card.

10. The IC card processor of claim 9, wherein the modulator modulates an Amplitude Shift Keying (ASK) 10% modulation and a Non-Return to Zero (NRZ) coding according to a standard of ISO/IEC B type.

11. An IC card system for transceiving a data signal in the manner of non-contact between an IC card processor and an IC card, wherein the IC card comprises:

a first antenna for receiving a transmission signal from the IC card processor; and

a first modulator for modulating a signal to transmit to the processor in the manner of Quadrature Amplitude Modulation (QAM),

wherein the transmission signal modulated by the first modulator is transmitted through the first antenna, and wherein the IC card processor comprises;

a second antenna for receiving a transmission signal from the IC card, and

a second demodulator for restoring the transmission signal from the IC card by demodulating the transmission signal received by the second antenna in the manner of QAM, wherein the transmission signal modulated by the modulator is transmitted through the antenna.

12. The IC card system of claim 11, wherein the IC card further includes a first demodulator for restoring the signal transmitted from the IC card processor by demodulating the reception signal received by the first antenna.

13. The IC card system of claim 11, wherein the IC card processor further comprises a second modulator for modulating a signal to transmit to the IC card.

14. An IC card system for transceiving a data signal in the manner of non-contact between the IC card processor and the IC card, wherein the IC card comprises:

a first antenna for receiving a transmission signal from the IC card processor;

a first modulator for performing Quadrature Amplitude Modulation (QAM) a signal to transmit to the processor; and

a first demodulator for demodulating a reception signal received by the first antenna so that the reception signal are restored,

wherein the transmission signal modulated by the first modulator is transmitted through the first antenna,

wherein the IC card processor comprises;

a second antenna for receiving a reception signal from the IC card;

a second demodulator for performing Quadrature Amplitude Modulation (QAM) on the reception signal received from the second antenna so that the reception signals are restored; and

a second modulator for modulating a signal to transmit to the IC card, wherein the transmission signal modulated by the modulator is transmitted through the second antenna.

15. The IC card system of claim 14, wherein the first demodulator of the IC card demodulates an Amplitude Shift Keying (ASK) 10% modulation and a non-return to zero (NRZ) coding according to a standard of ISO/IEC B type.

16. The IC card system of claim 14, wherein the second modulator of the IC card processor modulates an ASK 10% modulation and a NRZ coding according to a standard of ISO/IEC B type.