WO2002039628A2 - Verfahren zur synchronisation eines funkempfängers auf funksignale - Google Patents
Verfahren zur synchronisation eines funkempfängers auf funksignale Download PDFInfo
- Publication number
- WO2002039628A2 WO2002039628A2 PCT/DE2001/003860 DE0103860W WO0239628A2 WO 2002039628 A2 WO2002039628 A2 WO 2002039628A2 DE 0103860 W DE0103860 W DE 0103860W WO 0239628 A2 WO0239628 A2 WO 0239628A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- synchronization
- radio receiver
- radio
- signals
- receiver
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/20—Arrangements for broadcast or distribution of identical information via plural systems
- H04H20/22—Arrangements for broadcast of identical information via plural broadcast systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/44—Arrangements characterised by circuits or components specially adapted for broadcast
- H04H20/46—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95
- H04H20/51—Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups H04H20/53-H04H20/95 specially adapted for satellite broadcast systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H2201/00—Aspects of broadcast communication
- H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
- H04H2201/20—Aspects of broadcast communication characterised by the type of broadcast system digital audio broadcasting [DAB]
Definitions
- the invention relates to a method for synchronizing a radio receiver to radio signals according to the preamble of the independent claim.
- DAB Digital Audio Broadcasting
- TFPR symbols which are periodically arranged in the DAB data stream for more precise synchronization.
- These TFPR symbols also called phase reference symbols, are autocorrelation sequences, for which the so-called CAZAC sequences are used in particular.
- CAZAC sequences have such correlation properties that, if there is a match, a high autocorrelation signal and if there is no match, a zero is output as the autocorrelation signal.
- the TFPR symbol can then be used to determine the frequency offset which is due to a non-ideal clock frequency in the radio receiver, a Doppler shift due to a movement of the radio receiver or a frequency offset of the transmitter.
- the channel impulse response can also be determined using the TFPR symbol, with which the time deviation and other signal parameters can be determined.
- the so-called FFT Fast Fourier Transform
- FFT Fast Fourier Transform
- the method according to the invention for synchronizing a radio receiver to radio signals with the features of the independent claim has the advantage that the location signal, preferably a GPS (Global Positioning System) signal, can be used to determine an exact time and thus an exact time cycle, and thus after one Coarse synchronization has a fixed time clock and with which the on-board clock of the radio receiver can be corrected if necessary. Speed vectors can still be determined with the locating signal in order to correct a Doppler shift in the frequency of the radio signals. Overall, the synchronization is considerably improved, which is mainly due to the fact that GPS and DAB are uncorrelated methods and so a systematic error in a transmission method does not also affect the correction signals in the radio receiver. This increases the audio quality or the quality of the received data considerably.
- GPS Global Positioning System
- the correction with the location signals is carried out by a filter, preferably a predictor.
- a Kalman filter with excellent properties can then be used.
- a predictor a prediction of a message signal is required, that is, a negative dead time.
- the term “Cayman filter” is understood to mean a calculation method that determines an estimate for a variable that can be measured.
- the Cayman filter is particularly recursive and can be implemented on a processor.
- Location device such as a GPS receiver can be connected and which has a correction unit, the Cayman filter, with which the correction of the synchronization of the received radio signals can be carried out.
- FIG. 1 shows a block diagram of the radio receiver according to the invention
- FIG. 2 shows a flow diagram of the method according to the invention. description
- this synchronization is carried out first with a coarse synchronization and then with a fine synchronization.
- the coarse synchronization is not sufficient to decode the DAB signal as error-free as possible, since the mobile radio channel causes large fluctuations in the performance of the DAB radio signal.
- the set reception frequency must be synchronized very precisely to the frequency actually broadcast.
- Another problem is the on-board clock. If the on-board clock of the receiver is too far away from the ideal frequency, synchronization is not possible at all.
- the deviations calculated with the TFPR symbol are themselves subjected to a correction based on a received location signal.
- the known GPS signal is used for the location signal.
- other location signals are also possible, which enable precise time determination.
- the GPS signal provides a very precise time reference and a very precise position determination. Both information can be used to improve DAB synchronization. This requires preprocessing, because a speed vector can only be calculated from the position data by time derivation.
- the actual on-board clock frequency can be derived from the GPS time and the
- Target frequency of the on-board clock are determined.
- a counter is preferably used which counts a predetermined oscillation or cycle through the GPS time and the on-board cycle and then carries out a comparison. It is sufficient if the DAB receiver receives a GPS-accurate time: it can then calculate the deviation of its on-board clock from the ideal.
- the frequency correction unit described above can be set before receiving the first DAB data so that the non-ideal on-board clock is already compensated for in the first data. As a result, the initial synchronization is significantly accelerated and is now independent of the clock frequency in a further frame.
- Another aspect is the use of the exact timing of the GPS receiver for time synchronization. Many DAB transmitter networks are already synchronized via GPS. In these
- the timing of the GPS receiver can be used directly if the radio receiver is not moving.
- the GPS receiver supplies this information via the detour of the position data.
- the TFPR analysis only has to add the additional ones resulting from the movement Eliminate deviations. If the performance of the DAB signal drops so much that decoding of the TFPR symbol is no longer possible, the GPS time clock can maintain the synchronization to such an extent that when the DAB signal is reinserted, rough time synchronization with the zero symbol is no longer necessary is.
- the speed information determined from the position data can contribute in another way to improving the DAB synchronization. Since the Doppler shift only depends on the reception frequency and the relative speed between the transmitter and receiver, it can be calculated which maximum Doppler shift can occur with the current values. This information can in turn flow into the error detection of the correction value calculation.
- Correction value calculation is preferably carried out with a filter, a predictor, and a Cayman filter is used here.
- a filter can be implemented on a digital signal processor.
- FIG. 1 shows a block diagram of the radio receiver according to the invention.
- An antenna 1 is connected to an input of a high-frequency receiving part 2.
- An output of the high-frequency receiver 2 is at a first
- a processor 4 is connected to a second input of the processor 3.
- An output of the processor 3 leads to an audio decoding 7, the output of which is in turn connected to an audio amplifier 8.
- the audio amplifier 8 is connected to an input of a loudspeaker 9.
- a GPS receiver 5 is connected to an input of the processor 4.
- An antenna 6 is connected to an input of the GPS receiver 5.
- the radio or radio signals received with the antenna 1 are amplified by the high-frequency receiver 2, filtered and mixed down to an intermediate frequency and digitized.
- the resulting digital data stream is then first of all possible by processor 3
- the processor 3 first performs a rough synchronization with the zero symbol in the DAB frame when the DAB signal is received for the first time. After a successful rough time synchronization, the processor 3 carries out a fine synchronization with the TFPR symbol and thereby determines the frequency offset, the time offset and a possible phase shift. With the antenna 6, the GPS signals, which are emitted by various satellites, are received and evaluated in the GPS receiver 5. The GPS receiver 5 thus supplies the current position of the radio receiver according to the invention and an exact time clock to the processor 4.
- the processor 4 calculates a speed vector from the GPS data by evaluating successive position determinations for the radio receiver, and the processor 4 determines whether the on-board clock of the radio receiver according to the invention corresponds to the specification.
- This data is then transmitted to the processor 3, so that the processor 3 carries out the correction of the frequency, time and phase offset by using a filter, namely a predictor, here a Cayman filter.
- the DAB data synchronized in this way is then transferred to the audio decoding 7, which just performs the audio decoding on the DAB data.
- This audio decoding 7 is implemented here in order to achieve a higher speed in hardware, and this can also be implemented on a processor.
- the digital audio data are then converted by the audio decoding 7 into analog audio signals in order to then transmit them to the audio amplifier 8, which amplifies the audio signals so that they can be reproduced with the loudspeaker 9.
- the inventive method is shown as a flow chart.
- the digital radio signals that is to say the DAB signals, are received and there is a rough synchronization to the zero symbol.
- the process takes place in processor 3
- Fine synchronization with the TFPR symbol to calculate the frequency, time and phase offset In method step 12, the GPS data are determined with the GPS receiver 5 and the antenna 6, so that the GPS receiver 5 can determine the current position and the exact time cycle. In method step 13, the on-board clock of the radio receiver according to the invention and the speed of the radio receiver according to the invention are determined. This data is then used in method step 14 to correct the frequency, time and phase offset. In
- Method step 15 involves processing the synchronized data by performing channel and source coding.
- the audio data is reproduced in method step 16.
- DAB digital audio signal
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002541831A JP4047721B2 (ja) | 2000-11-07 | 2001-10-09 | 無線受信機を無線信号に同期させる方法 |
US10/416,070 US20040057540A1 (en) | 2000-11-07 | 2001-10-09 | Method for synchronizing a radio receiver to radio signals |
DE50102552T DE50102552D1 (de) | 2000-11-07 | 2001-10-09 | Verfahren zur synchronisation eines funkempfängers auf funksignale |
EP01993991A EP1336266B1 (de) | 2000-11-07 | 2001-10-09 | Verfahren zur synchronisation eines funkempfängers auf funksignale |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10055087A DE10055087A1 (de) | 2000-11-07 | 2000-11-07 | Verfahren zur Synchronisation eines Funkempfängers auf Funksignale |
DE10055087.8 | 2000-11-07 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002039628A2 true WO2002039628A2 (de) | 2002-05-16 |
WO2002039628A3 WO2002039628A3 (de) | 2003-01-03 |
Family
ID=7662392
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2001/003860 WO2002039628A2 (de) | 2000-11-07 | 2001-10-09 | Verfahren zur synchronisation eines funkempfängers auf funksignale |
Country Status (5)
Country | Link |
---|---|
US (1) | US20040057540A1 (de) |
EP (1) | EP1336266B1 (de) |
JP (1) | JP4047721B2 (de) |
DE (2) | DE10055087A1 (de) |
WO (1) | WO2002039628A2 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8279908B2 (en) * | 2008-12-31 | 2012-10-02 | Ibiquity Digital Corporation | Synchronization of separated platforms in an HD radio broadcast single frequency network |
WO2018204210A1 (en) * | 2017-05-01 | 2018-11-08 | Parkofon Inc. | System and method for high accuracy location determination and parking |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5689245A (en) * | 1992-10-19 | 1997-11-18 | Radio Satellite Corporation | Integrated communications terminal |
EP0938203A1 (de) * | 1997-05-13 | 1999-08-25 | Sony Corporation | Empfänger und empfängerschaltung |
EP1039311A1 (de) * | 1999-03-23 | 2000-09-27 | France Telecom | Funkempfänger mit zwei Betriebsarten und Multimediaempfänger dafür |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4028322A1 (de) * | 1990-09-06 | 1992-03-19 | Bosch Gmbh Robert | Verfahren zur verbesserung einer kanalparameterschaetzung und anordnung zu dessen durchfuehrung |
DE4330672A1 (de) * | 1993-09-10 | 1995-03-16 | Thomson Brandt Gmbh | Verfahren zur ]bertragung von digitalisierten Fernseh- und/oder Tonrundfunksignalen |
US5596328A (en) * | 1994-08-23 | 1997-01-21 | Honeywell Inc. | Fail-safe/fail-operational differential GPS ground station system |
US5857155A (en) * | 1996-07-10 | 1999-01-05 | Motorola, Inc. | Method and apparatus for geographic based control in a communication system |
JPH11252038A (ja) * | 1998-02-27 | 1999-09-17 | Sony Corp | デジタル放送の受信機 |
JPH11281377A (ja) * | 1998-03-31 | 1999-10-15 | Sony Corp | 地図情報取得方法、ナビゲーション方法、地域情報提供方法、ナビゲーション装置、地域情報提供装置及び自動車 |
US6429808B1 (en) * | 1999-11-12 | 2002-08-06 | Motorola, Inc. | Method and apparatus for assisted GPS integrity maintenance |
US6611755B1 (en) * | 1999-12-19 | 2003-08-26 | Trimble Navigation Ltd. | Vehicle tracking, communication and fleet management system |
-
2000
- 2000-11-07 DE DE10055087A patent/DE10055087A1/de not_active Withdrawn
-
2001
- 2001-10-09 US US10/416,070 patent/US20040057540A1/en not_active Abandoned
- 2001-10-09 WO PCT/DE2001/003860 patent/WO2002039628A2/de active IP Right Grant
- 2001-10-09 DE DE50102552T patent/DE50102552D1/de not_active Expired - Lifetime
- 2001-10-09 JP JP2002541831A patent/JP4047721B2/ja not_active Expired - Fee Related
- 2001-10-09 EP EP01993991A patent/EP1336266B1/de not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5689245A (en) * | 1992-10-19 | 1997-11-18 | Radio Satellite Corporation | Integrated communications terminal |
EP0938203A1 (de) * | 1997-05-13 | 1999-08-25 | Sony Corporation | Empfänger und empfängerschaltung |
EP1039311A1 (de) * | 1999-03-23 | 2000-09-27 | France Telecom | Funkempfänger mit zwei Betriebsarten und Multimediaempfänger dafür |
Also Published As
Publication number | Publication date |
---|---|
DE50102552D1 (de) | 2004-07-15 |
JP4047721B2 (ja) | 2008-02-13 |
EP1336266A2 (de) | 2003-08-20 |
WO2002039628A3 (de) | 2003-01-03 |
EP1336266B1 (de) | 2004-06-09 |
DE10055087A1 (de) | 2002-05-16 |
JP2004535691A (ja) | 2004-11-25 |
US20040057540A1 (en) | 2004-03-25 |
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