EP1743434A1 - Verfahren und einrichtung zur demodulation - Google Patents
Verfahren und einrichtung zur demodulationInfo
- Publication number
- EP1743434A1 EP1743434A1 EP05706740A EP05706740A EP1743434A1 EP 1743434 A1 EP1743434 A1 EP 1743434A1 EP 05706740 A EP05706740 A EP 05706740A EP 05706740 A EP05706740 A EP 05706740A EP 1743434 A1 EP1743434 A1 EP 1743434A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- intermediate frequency
- input
- clock
- comparison
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/041—Means for supplying power to the signal- transmitting means on the wheel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/041—Means for supplying power to the signal- transmitting means on the wheel
- B60C23/0413—Wireless charging of active radio frequency circuits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
- B60C23/0433—Radio signals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
- B60C23/0422—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver characterised by the type of signal transmission means
- B60C23/0433—Radio signals
- B60C23/0447—Wheel or tyre mounted circuits
- B60C23/0455—Transmission control of wireless signals
- B60C23/0462—Structure of transmission protocol
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
- H04B1/28—Circuits for superheterodyne receivers the receiver comprising at least one semiconductor device having three or more electrodes
Definitions
- the invention relates to a method and a device for demodulating an input signal comprising a modulated data signal according to the preambles of claims 1 and 7, respectively.
- the invention is therefore based on the object to provide a method of the generic type so that it can be implemented inexpensively.
- the clock signal is used directly as a comparison signal, unnecessary further measures for deriving the comparison signal, so that a particularly inexpensive method results.
- the variant according to claim 3 is characterized by a good suitability for the transmission of sensor data.
- the fixed phase reference of the individual signals to each other allows a particularly simple demodulation.
- the demodulation is particularly simple. To recover the data signal, a simple sampling of the processed intermediate frequency signal is used. Otherwise, units commonly needed for demodulation, such as a PLL circuit, are not required.
- signal transit times can be considered and availableghchen means of the adjustable time delay.
- the demodulation method can thus be operated particularly efficiently and error-prone.
- the variant according to claim 6 leads to a substantially rectangular waveform of the processed intermediate frequency signal, so that a bit change due to the very steep edges in the following Kontxollmaschine can be particularly easily detected.
- the invention continues to be based on the abe to specify a device of the generic type so that it can be realized inexpensively.
- FIG. 1 shows a first embodiment of a device for sensor data transmission and for demodulation of a received input signal
- FIG. 2 shows timing diagrams of signals occurring in the first embodiment according to FIG. 1,
- FIG. 3 shows a second exemplary embodiment of a device for sensor data transmission and for demodulation of a received input signal
- FIGS. 1 to 4 timing diagrams of occurring in the second embodiment of FIG. 3 signals. Corresponding parts are provided in FIGS. 1 to 4 with the same reference numerals.
- FIG. 1 shows a first embodiment of a device 1 for data transmission and demodulation in the form of a sensor-transponder system.
- the device 1 is intended for batterieose Drackabfrage in a tire, not shown in Fig. 1 of a motor vehicle.
- the device 1 comprises a control unit 2 and a wheel module 3, between which there are wireless connections 4 and 5.
- the controller 2 includes a
- the control unit 6 is connected to an external clock generator 16.
- the control unit 6 is designed in the example as a micro-processor. Alternatively, however, a design as a micro-controller or as a computer is conceivable.
- the control unit 6 includes a plurality of sub-assemblies or functional units, some of which are shown in the illustration of FIG.
- An internal clock unit 17 as well as a decoupler 18 and also a frequency divider 19 are connected to the input of the control unit 6, to which the external clock generator 16 is connected. With a second connection, the frequency consumer 19 is probably brought to a delay element 20 and the low-frequency output, which is connected to the signal conditioning unit 7.
- the decoupler 18 is guided to an output of the control unit 6, which is connected by means of a connecting line 18 a to a comparison input 20 a of the mixer 12.
- the delay gate 20 is connected to an output of the control unit 6. Between this output and a sampling clock input 21 of the Kontro unit 6, an electrical connection is provided.
- the sampling clock input 21 leads internally to a sampling clock unit 22, which is connected to a sampling element 23 acting on the sampling input 14.
- the wheel module 3 includes an LF receiving antenna 24, a control and KontroUappel 25, a sensor 26 and an RF transmitting antenna 27.
- the control and KontroUappel 25 is the central element to which all other components of the wheel module 3 are connected.
- a low-frequency signal of the frequency f 1 is generated in the frequency Teüer 19 and supplied via the signal conditioning unit 7 and the driver 8 as a transmission signal Sl of the LF transmission antenna 9.
- the frequency fO is 13.4975 MHz and the frequency f 1 is 124.977 kHz.
- the frequency divider 19 has a division factor of 108 in the Aus technologicalangsbeispiel.
- the transmission signal Sl is emitted and passes via the wireless connection 4 to the LF reception antenna 24, from which it is received signal E2 Will be received.
- the control and KontroUappel 25 wins from the received signal E2 on the one hand, the energy required for the operation of the wheel module 3 and derives on the other hand by means of frequency multiplication by a factor of 108.5 a significantly higher frequency £ 2 with a value of 13.56 MHz ,
- the sensor 26 detects the pressure currently prevailing in the tire. This is modulated with further data as data signal D in the control and KontioUech 25 to a carrier signal to a transmission signal S2.
- the data rate of the data signal D is also derived from the received frequency fl. It is for example 31.25 kBaud.
- the modulation method used is a PSK (Phase Shift Keying) method.
- the transmission signal S2 is transmitted from the RF transmission antenna 27 via the wireless connection 5 to the RF reception antenna 10 and received there as the reception signal El. It is fed via the input amplifier 11 in the mixer 12, in which a mixture with a comparison signal V to an intermediate frequency signal ZF1.
- the comparison signal V is derived from the clock signal T provided for clock supply to the control unit 6. In particular, it is substantially equal to the clock signal T, which is looped through the control unit 6 via the decoupler 18 designed as a driver or as a buffer circuit and is present at the comparison input 20a of the mixer 12.
- the decoupler 18 prevents unwanted feedback on the Clock generator 16.
- the comparison signal V has the same frequency f0 as the clock signal T, ie 13.4975 MHz. A separate LokalosziUator that would otherwise be anszuschhe built to the comparison input 20a of the mixer 12, so is not needed. This results in a cost-effective implementation of the demodulation subunit.
- the intermediate frequency signal ZF1 first passes through a narrow-band frequency filter in the signal conditioning unit 13, for example a low-pass filter or a bandpass filter. Thereafter, by means of a suitable circuit, an amphetous limitation and a conversion into a rectangular signal can take place. Here, the use of a Schmitt trigger is possible. At the output of the signal processing unit 13 there is then a conditioned intermediate frequency signal ZF2 having a substantially rectangular waveform and a main frequency f3.
- the frequency f3 in the example has the value 62.5 kHz.
- the control unit 6 is awakened by a corresponding signal level at the wake-up input 15. This is done, for example, by means of a standard interrupt.
- the signal level of the pending intermediate frequency signal ZF2 as an input signal in the KontroUech 6 arrive.
- the sampling 14 so a sampling takes place, in the DarsteUung of FIG. 1 by the Abtastglied 23 and the sampling clock unit 22 is symbohsiert.
- this sampling results in synchronous demodulation.
- the demodulated data signal D either directly corresponds to the supplied by the Abtastghed 23 discrete input signal or can be generated in a simple manner and with purely digital combination operations from the discrete input signal.
- FIG. 2 illustrates a possible mode of action based on time diagrams.
- the above-mentioned data signal D corresponds to a bit string of "1", “0", “0” and “1".
- the associated conditioned intermediate frequency signal ZF2 is shown in the middle.
- a sampling signal AI reproduced below is provided by the sampling clock unit 22.
- the sampling signal AI has the same frequency f 1 as the transmission signal S 1.
- Both signals are derived from the output signal of the frequency divider 19, ie ultimately from the clock signal T of the clock generator 16.
- the sampling of the intermediate frequency signal ZF 2 takes place in each case at a flush edge of the sampling signal AI. This results in discrete samples with logic levels, which are marked with circles in FIG.
- a Nutzsignalbit are assigned four samples in this choice of frequencies fO, fl, f2, f3 and the data bit rate of the data signal D.
- a useful signal bit with the logical value "1” corresponds to the sampled level sequence "1 0 1 0" and a useful signal bit with the logical value "0” corresponds to the sampled level sequence "0 1 0 1".
- a sampling signal A diverted from the output signal of the frequency divider 19 can be delayed by means of the delay input element 20 by an adjustable period of time. to be cleaned.
- the delay time can be acknowledged by the control unit 6 according to the specifications of a pre-runtime measurement.
- the required delay time can also be determined autonomously by the control unit 6 at the beginning of the operation, for example by means of a few previously transmitted synchronization bits which trigger a time measurement at each edge change of the intermediate frequency signal ZF2.
- This variant is particularly advantageous if no closed signal circuit as in the device 1 vorhelgt, but only a unidirectional subsystem with a signal path from the sensor 26 to KontroUech 6. For example, three measurements to synchronization bits by averaging the required Zeitverzögerang for the sampling clock 22nd be determined and set.
- a particular advantage of the device 1 is that all frequencies are derived from the clock signal T of the external clock generator 16. As a result, on the one hand eliminates the need for other clock generators and on the other hand, the various signals each have a fixed phase relationship to each other. As a result, the described, very simple and inexpensive to implement synchronous demodulation method, which makes do without the otherwise usual for a demodulation modules, allows. Due to the hardware and software technical integration of KontroUemheit 6 in the demodulation process results in a cost savings.
- the demodulation method and the device 1 are also to be used in a very large frequency interval.
- the frequencies f0, f1, f2 and £ 3 used, as well as the data bit rate, can be in a wide range Range can be varied.
- the frequency f0 should only be chosen to be within the frequency range specified for the control unit 6.
- the device 1 is also suitable for bidirectional data transmission.
- the transmission signal Sl can nä hch except for energy transmission and data transmission from the controller 2 to the wheel module 3 are used.
- a carrier signal of the frequency f 1 in the control unit 6 modulates a corresponding data signal. Detection takes place in the KontioUech 25 of the wheel module. 3
- a second Aussolidangsbeispiel a device 28 for data transmission and demodulation dargesteUt dargesteUt.
- the device 28 differs from the device 1 according to FIG. 1 only in a few aspects.
- a control device 29 contains a slightly differently constructed control unit 30.
- a first difference is that the delay element 20 is not guided to an output of the control unit, but is internally connected to the sampling clock unit 22 by means of a further optional frequency divider 31.
- the frequency divider 31 causes a halving of the frequency fl of the sampling signal A, so that the scanning member 23 of the sampling clock 22, a sampling signal A2 is supplied with a frequency f4 of 62.5 kHz.
- the clock signal T is not looped through the control unit 30. Instead, an external connection line 32 is provided between the clock generator 16 and the mixer 12. If required, the external connection line 32 can also be equipped with a decoupler or a buffer circuit.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004016834 | 2004-04-01 | ||
DE102004043635A DE102004043635A1 (de) | 2004-04-01 | 2004-09-07 | Verfahren und Einrichtung zur Demodulation |
PCT/DE2005/000200 WO2005101676A1 (de) | 2004-04-01 | 2005-02-05 | Verfahren und einrichtung zur demodulation |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1743434A1 true EP1743434A1 (de) | 2007-01-17 |
Family
ID=34954904
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05706740A Withdrawn EP1743434A1 (de) | 2004-04-01 | 2005-02-05 | Verfahren und einrichtung zur demodulation |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1743434A1 (de) |
DE (2) | DE102004043635A1 (de) |
FR (1) | FR2868625A1 (de) |
WO (1) | WO2005101676A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006048334A1 (de) * | 2006-10-12 | 2008-04-17 | Conti Temic Microelectronic Gmbh | Verfahren und Einrichtung zur Übertragung von Daten zwischen einem Steuergerät und einem Radmodul |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5517194A (en) * | 1994-02-10 | 1996-05-14 | Racom Systems, Inc. | Passive RF transponder and method |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2019054B (en) * | 1978-01-25 | 1982-04-21 | Helsby N C | Portable timecode receiver clock |
AU564509B2 (en) * | 1984-10-09 | 1987-08-13 | X-Cyte Inc. | Phase-encoded transponder interrogation |
DE69728797T2 (de) * | 1996-01-03 | 2005-04-14 | Texas Instruments Deutschland Gmbh | Identifizierungssystem |
KR100427854B1 (ko) * | 1998-10-22 | 2004-04-28 | 인피니언 테크놀로지스 아게 | 주파수 안정화된 송/수신 회로 |
US6801583B1 (en) * | 2000-06-28 | 2004-10-05 | Northrop Grumman Corporation | Multi-carrier receiver including an analog-to-digital converter for a wireless telecommunication system |
WO2003058834A1 (en) * | 2002-01-11 | 2003-07-17 | Koninklijke Philips Electronics N.V. | Method for providing clock signals to transceiver chip and transceiver chip |
DE10210037A1 (de) * | 2002-03-07 | 2003-10-02 | Siemens Ag | Aktiver Backscatter-Transponder, Kommunikationssystem mit einem solchen und Verfahren zum Übertragen von Daten mit einem solchen aktiven Backscatter-Transponder |
-
2004
- 2004-09-07 DE DE102004043635A patent/DE102004043635A1/de not_active Withdrawn
-
2005
- 2005-02-05 WO PCT/DE2005/000200 patent/WO2005101676A1/de not_active Application Discontinuation
- 2005-02-05 EP EP05706740A patent/EP1743434A1/de not_active Withdrawn
- 2005-02-05 DE DE112005000380T patent/DE112005000380D2/de not_active Withdrawn - After Issue
- 2005-04-01 FR FR0503221A patent/FR2868625A1/fr active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5517194A (en) * | 1994-02-10 | 1996-05-14 | Racom Systems, Inc. | Passive RF transponder and method |
Non-Patent Citations (1)
Title |
---|
See also references of WO2005101676A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2005101676A1 (de) | 2005-10-27 |
DE102004043635A1 (de) | 2005-10-20 |
DE112005000380D2 (de) | 2006-11-02 |
FR2868625A1 (fr) | 2005-10-07 |
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Inventor name: DONAUBAUER, JUERGEN Inventor name: KRAMMEL, KARL Inventor name: KUFNER, BERNHARD Inventor name: FLEISCHER, THOMAS Inventor name: HAHN, KARL-HEINZ Inventor name: LIESAUS, FRANK |
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