WO2002091640A2 - Verfahren zur erhöhung der abgestrahlten leistung bei der übertragung digitaler mehrträger-signale mit am-sendern - Google Patents
Verfahren zur erhöhung der abgestrahlten leistung bei der übertragung digitaler mehrträger-signale mit am-sendern Download PDFInfo
- Publication number
- WO2002091640A2 WO2002091640A2 PCT/DE2002/001299 DE0201299W WO02091640A2 WO 2002091640 A2 WO2002091640 A2 WO 2002091640A2 DE 0201299 W DE0201299 W DE 0201299W WO 02091640 A2 WO02091640 A2 WO 02091640A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- amplitude
- digital
- band
- modulated
- 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
- H04H20/44—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
- H04H20/47—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 stereophonic broadcast systems
- H04H20/49—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 stereophonic broadcast systems for AM stereophonic broadcast systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the invention relates to the field of radio transmitters, which are being converted from analog amplitude modulation (AM) to digital modulation in the course of digitization.
- AM analog amplitude modulation
- the AM transmitters work internally in switching mode and therefore have up to a factor of 3 better efficiencies than linear transmitters, which are otherwise usually used for digital transmission, e.g. with DAB (Digital Audio Broadcasting) and DNB (Digital Video Broadcasting). This results in savings in operating costs.
- DAB Digital Audio Broadcasting
- DNB Digital Video Broadcasting
- non-linear AM transmitter for digital modulation requires a special mode of operation of the transmitter.
- analog AM case only the envelope of the RF carrier oscillation is influenced in accordance with the message signal.
- the modulated digital signal is generated using two mutually orthogonal partial signals (I and Q).
- the I signal (“in phase”) is modulated onto a cosine oscillation with the frequency Ft (carrier frequency).
- the Q signal (“quadrature”) is modulated onto a sine wave of the same frequency Ft.
- the sum Both modulated vibrations result in the complex modulated data signal (cosine 0 - 180 degrees, sine -90 - +90 degrees).
- the modulated I / Q signal is shaped by filters so that it has exactly the prescribed curve shape with the desired bandwidth.
- the modulated I / Q signal must be converted in such a way that the two signals, amplitude signal (A signal) and phase-modulated carrier signal (RF-P), are generated, which are suitable for correctly controlling the AM transmitter.
- a signal amplitude signal
- RF-P phase-modulated carrier signal
- the modulated I / Q signal corresponds to a Cartesian representation. This is converted into a polar representation with amplitude and phase.
- the amplitude signal (A signal) is thus obtained for controlling the AM transmitter at the audio input.
- a phase-modulated RF (RF-P signal) is generated from the phase signal (P signal) that initially arises.
- the RF-P signal can also advantageously be obtained directly via the P signal without the intermediate step. This gives you the signals necessary to control the AM transmitter:
- the A signal is fed into the modulator input (audio input) of the AM transmitter and the RF-P signal is used to control the transmitter according to HF.
- the two signals A & RF-P are multiplicatively combined in the transmitter output stage and form the high-frequency digital output signal. Theoretically, this is identical to the correspondingly amplified, complex, modulated I / Q signal before the coordinate conversion.
- the digital output signal of an AM transmitter is not exactly identical to the amplified, modulated I / Q signal. Rather, the output signal differs as a result the nonlinear distortion that arises during the modulation process in the AM transmitter and the resulting undesired secondary emissions.
- the in-band interference reduces the coverage area that can be reached, since a signal that is already disturbed can tolerate less interference in the radio channel in order to reach a critical threshold at the receiver.
- Non-linear distortions are particularly problematic when multicarrier signals, e.g. B. OFDM signals (Orthogonal Frequency Division Multiplexing) are to be transmitted.
- multi-carrier modulations have a fairly rectangular spectrum, they are noise-like in nature in the time domain, both for the I component and for the Q component of the time signal. This is the result of the overlapping of many subchannels that are practically independent of one another.
- a Crestfactor_digital of 10 dB means that a transmitter that e.g. B. 100 KW can radiate effective digital power, must be designed for a peak power of 1000 KW.
- more digital power, for a given type size of the transmitter could be emitted if the crest factor_digital were less than 10 dB.
- the present invention has for its object to offer a method with which a small crest factor and thus a high radiated power is achieved in the transmission of digital multicarrier signals by AM transmitters and at the same time in-band interference and out-of-band radiation are reduced.
- the object is achieved in that the amplitude of the A signal is limited and the amplitude is limited before the complex I / Q signal is converted into the A signal and the phase-modulated RF signal.
- a significant reduction in the in-band and out-of-band interference results if the amplitude limitation is carried out before the complex I / Q signal is converted into the A signal and the RF-P signal. This is advantageous because the in-band interference and out-of-band radiation can only be minimized if the A and RF-P signals are coupled without interference.
- the amplitude limitation for the I / Q signal is achieved in that the equivalent baseband signals are carried over a limitation (see FIG. 1).
- Additional filtering according to the I / Q amplitude limitation enables the sharply cut off curves in the I / Q signal to be rounded off, which in particular significantly reduces in-band interference.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Transmitters (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10123150A DE10123150A1 (de) | 2001-05-03 | 2001-05-03 | Verfahren zur Erhöhung der abgestrahlten Leistung bei der Übertragung digitaler Mehrträger-Signale mit AM-Sendern |
DE10123150.4 | 2001-05-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002091640A2 true WO2002091640A2 (de) | 2002-11-14 |
WO2002091640A3 WO2002091640A3 (de) | 2003-02-13 |
Family
ID=7684555
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2002/001299 WO2002091640A2 (de) | 2001-05-03 | 2002-04-09 | Verfahren zur erhöhung der abgestrahlten leistung bei der übertragung digitaler mehrträger-signale mit am-sendern |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE10123150A1 (de) |
WO (1) | WO2002091640A2 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2855685B1 (fr) | 2003-05-27 | 2007-08-31 | Telediffusion De France Tdf | Procede et emetteur de radiodiffusion en oeuvre un pre-filtrage, et signal correspondant |
FR2878388B1 (fr) * | 2004-11-25 | 2007-01-26 | Telediffusion Fse | Procede de diffusion d'un signal numerique transmis au voisinage d'un signal analogique, dispositif de diffusion et signal numerique correspondants |
EP1833215A1 (de) * | 2006-03-10 | 2007-09-12 | Harris Broadcast Systems Europe | Erkennung von überhöhter Signalleistung |
-
2001
- 2001-05-03 DE DE10123150A patent/DE10123150A1/de not_active Withdrawn
-
2002
- 2002-04-09 WO PCT/DE2002/001299 patent/WO2002091640A2/de not_active Application Discontinuation
Non-Patent Citations (3)
Title |
---|
O'NEILL R ET AL: "Envelope variations and spectral splatter in clipped multicarrier signals" PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS, 1995. PIMRC'95. WIRELESS: MERGING ONTO THE INFORMATION SUPERHIGHWAY., SIXTH IEEE INTERNATIONAL SYMPOSIUM ON TORONTO, ONT., CANADA 27-29 SEPT. 1995, NEW YORK, NY, USA,IEEE, US, 27. September 1995 (1995-09-27), Seiten 71-75, XP010150796 ISBN: 0-7803-3002-1 * |
SENGER P: "DRM - DIGITAL RADIO MONDIALE EIN WELTWEITES KONSORTIUM FUER EINEN NEUEN DIGITALEN STANDARD" RUNDFUNKTECHNISCHE MITTEILUNGEN, MENSING. NORDERSTEDT, DE, Bd. 43, Nr. 1, M{rz 1999 (1999-03), Seiten 29-35, XP000824065 ISSN: 0035-9890 * |
XIAODONG LI ET AL: "Effects of clipping and filtering on the performance of OFDM" VEHICULAR TECHNOLOGY CONFERENCE, 1997, IEEE 47TH PHOENIX, AZ, USA 4-7 MAY 1997, NEW YORK, NY, USA,IEEE, US, 4. Mai 1997 (1997-05-04), Seiten 1634-1638, XP010229044 ISBN: 0-7803-3659-3 * |
Also Published As
Publication number | Publication date |
---|---|
WO2002091640A3 (de) | 2003-02-13 |
DE10123150A1 (de) | 2002-11-21 |
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