Method for transmitting data

• US 20020163976A1
• Filed: 04/26/2002
• Published: 11/07/2002
• Est. Priority Date: 05/04/2001
• Status: Abandoned Application

• Current Assignee: Atmel Germany GmbH (Microchip Technology Incorporated)
• Original Assignee: Atmel Germany GmbH (Microchip Technology Incorporated)
• Inventors: Karthaus, Udo
• Application Number:
  US10/132,956
• Publication Number:
  US 20020163976A1
• Time in Patent Office: Days
• US Class Current: 375/295
• CPC Class Codes: G06K 19/07786 the antenna being of the HF type, such as a dipole
• 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 25/4902 Pulse width modulation; Pulse position modulation
• CPC Class Codes: H04L 25/4904 using self-synchronising codes, e.g. split-phase codes
• CPC Class Codes: H04L 7/0066 detection of error based on transmission code rule

Abstract

In the known methods for transmitting data, the voltage of the modulation signal changes a plurality of times within one bit, or the voltage value of the modulation signal is determined by the significance of the bit.

In the new method, the voltage of the modulation signal changes from bit to bit irrespective of the type of modulation. The data rate is thus substantially increased in the case of an amplitude modulated carrier wave. Moreover, a data clock, which can replace internal clock generation, for example in the case of passive transponders, can be derived from the modulated carrier wave in a simple manner. The reduction of the power consumption increases the communication range of the transponder, especially when using carrier waves in the microwave range.

Claims

1. Method for transmitting data between a base station and a transponder by means of a modulation signal, that consists of at least two different voltage values (U1, U2), for modulating an electromagnetic carrier wave with a data word which consists of a sequence of data bits,

wherein

each bit position of the data word is successively assigned a voltage value (U1, U2) of the modulation signal with different values on adjacent bit positions, and the significance of the individual data bit determines the temporal length of the voltage value (U1, U2).

2. Method according to claim 1, wherein the modulation of the carrier wave is performed with a defined, repeating sequence of voltage values (U1, U2) of the modulation signal.

3. Method according to claim 1, wherein the modulation of the carrier wave is performed with a modulation signal that has two voltage values (U1, U2).

4. Method according to claim 2, wherein the modulation of the carrier wave is performed with a modulation signal that has two voltage values (U1, U2).

5. Method according to claim 1, wherein an amplitude modulation (ASK) of the carrier wave is performed by means of the modulation signal.

6. Method according to claim 4, wherein an amplitude modulation (ASK) of the carrier wave is performed by means of the modulation signal.

7. Method according to claim 1, wherein a phase modulation (PSK) of the carrier wave is performed by means of the modulation signal.

8. Method according to claim 4, wherein a phase modulation (PSK) of the carrier wave is performed by means of the modulation signal.

9. Method according to claim 1, wherein a frequency modulation (FSK) of the carrier wave is performed by means of the modulation signal.

10. Method according to claim 4, wherein a frequency modulation (FSK) of the carrier wave is performed by means of the modulation signal.

11. Method according to claim 1, wherein a shorter temporal length is assigned to the lower value bits in comparison to the higher value bits.

12. Method according to claim 6, wherein a shorter temporal length is assigned to the lower value bits in comparison to the higher value bits.

13. Method according to claim 8, wherein a shorter temporal length is assigned to the lower value bits in comparison to the higher value bits.

14. Method according to claim 10, wherein a shorter temporal length is assigned to the lower value bits in comparison to the higher value bits.

15. Method according to claim 12, wherein, in the case of a digital data word, half the length (t1) of the higher value bit is assigned to the lower value bit.

16. Method according to claim 1, wherein a data clock is derived from the modulated carrier wave in order to determine the temporal length of the data bits.

17. Method according to claim 15, wherein a data clock is derived from the modulated carrier wave in order to determine the temporal length of the data bits.

18. Method according to claim 17, wherein a system clock is derived from the data clock.