Abstract: A demodulator (6) for demodulating a modulated signal (3) comprises a Hubert transformer (7) for generating a Hubert transformed modulated signal (18) of the modulated signal (3). The Hubert transformed modulated signal (18) comprises modulated (5) and unmodulated signal sequences (4) and originates from an unmodulated signal. The demodulator (6) further comprises a comparing device (14) for comparing the Hubert transformed modulated signal (18) with a reference signal (15), which corresponds to the Hubert transformed unmodulated signal. The demodulator (6) is further configured to identify the modulated and unmodulated signal sequences (4, 5) based on the comparison.

Abstract: A multi-stage demodulation circuit receives a given communication signal modulated by a superposition of at least a first modulation scheme and a second modulation scheme, the circuit having a first demodulation stage that demodulates the received communication signal according to the first demodulation scheme, and generates one or more bits representing the first modulation state of the signal. An intermediate demodulation circuit removes the first modulation from the received communication signal to generate an intermediate demodulation signal having only the second modulation. A second demodulation stage demodulates the intermediate demodulation signal according to the second demodulation scheme and generates one or more additional bits representing the second modulation state of the given communication signal.

Abstract: An RFID transponder (1) comprises a demodulator (3) for demodulating received phase modulated carrier signals (CSQ), converting them down to a modulated baseband signal (MS) and filtering the converted signal. Sampling means (7) sample the filtered signal (FS) and store an actual sampling value (S(t0)) and a previous sampling value (S(t1)) of the filtered signal (FS). Subtracting means (8) calculate a difference (DS) between the actual sample value (S(t0)) and the previous sample value (S(t1)). Difference evaluation means (9) evaluate the difference (DS) according to the following criteria: a. if the difference is positive and outside of a predefined zero range (ZR) a first logical value is determined; b. if the difference is negative and outside of the zero range a second logical value is determined; c. if the difference is within the zero range the logical value of the latest evaluation is kept.

Abstract: A radio frequency (RF) communication device (1, 1?, 10) has data transmission means and data receiving means. The data transmission means comprise load modulating means (3) being adapted to receive a radio frequency carrier signal (CS1, CS2) emitted by another RF communication device (1, 1?, 10) and to modulate the RF carrier signal (CS1, CS2) by means of load modulation in accordance with data to be sent. The data receiving means comprise a RF frequency carrier signal generator (4) being adapted to emit a radio frequency carrier signal (CS1, CS2) and load demodulating means (5) being connected to an emission path (4a) of the radio frequency carrier signal and demodulating the radio frequency carrier signal (CS1, CS2) when it has been load modulated by another RF communication device (1, 1?, 10).

Abstract: A method of masking a current requirement of an electronic circuit (100) is provided, wherein the method comprises determining a current level required by the electronic circuit (100) and a corresponding point in time said current level is required by the electronic circuit (100), choosing a current level corresponding to a current level which is equal or higher than the determined current level, and switching a current level supplied to/consumed by the electronic circuit (100) to the chosen current level at a time instant deviating from the determined point in time.

Abstract: A method for coded data transmission between a base station (10) and at least one transponder (20) within a wireless data transmission system (1), the method comprising the steps of: —providing a set of symbols (S1 . . . S2n) for encoding data (DD), wherein the set of symbols (S1 . . . S2n) is divided into at least two sub-sets (SS1, SS2), and wherein each symbol (S1 . . . S2n) of the complete set is assigned to one of said at least two sub-sets (SS1, SS2); —encoding said data (DD) using symbols (S1 . . . S2n) of said at least two sub-sets (SS1, SS2), wherein at least one encoded symbol (S1 . . . S2n) comprises several bits; —transmitting each encoded symbol (S1 . . . S2n) within a symbol duration (SD) of an encoded data signal (DS) between said base station (10) and at least one transponder (20), wherein the sub-set (SS1, SS2) assigned to each encoded symbol (S1 . . . S2n) is indicated by a value of at least one bit (LB) of each encoded symbol (S1 . . .

Abstract: In a method of operating a transponder (1, 51) a parallel digital data stream comprised of a plurality of digital data sequences (23-25) is generated by the transponder (1, 51). Then, a plurality of modulated signals (42-44) by modulating each of the digital data sequences (23-25) with a dedicated carrier/subcarrier of a plurality of carriers/subcarriers (26-28) is generated. The modulated signals (42-44) are orthogonal to each other.

Abstract: A demodulator (6) for demodulating a modulated signal (3) comprises a Hubert transformer (7) for generating a Hubert transformed modulated signal (18) of the modulated signal (3). The Hubert transformed modulated signal (18) comprises modulated (5) and unmodulated signal sequences (4) and originates from an unmodulated signal. The demodulator (6) further comprises a comparing device (14) for comparing the Hubert transformed modulated signal (18) with a reference signal (15), which corresponds to the Hubert transformed unmodulated signal. The demodulator (6) is further configured to identify the modulated and unmodulated signal sequences (4, 5) based on the comparison.