WO1998009393A1 - Procede de reduction de l'interference interne dans des appareils radio mobiles - Google Patents

Procede de reduction de l'interference interne dans des appareils radio mobiles Download PDF

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Publication number
WO1998009393A1
WO1998009393A1 PCT/DE1997/001677 DE9701677W WO9809393A1 WO 1998009393 A1 WO1998009393 A1 WO 1998009393A1 DE 9701677 W DE9701677 W DE 9701677W WO 9809393 A1 WO9809393 A1 WO 9809393A1
Authority
WO
WIPO (PCT)
Prior art keywords
reception
interference
system clock
clock
channels
Prior art date
Application number
PCT/DE1997/001677
Other languages
German (de)
English (en)
Inventor
Bernhard Raaf
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1998009393A1 publication Critical patent/WO1998009393A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • H04B15/04—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2215/00—Reducing interference at the transmission system level
    • H04B2215/064—Reduction of clock or synthesizer reference frequency harmonics

Definitions

  • the invention relates to a method for reducing the intrinsic interference of radio radios by harmonics of a system clock.
  • the mobile radio system can be in accordance with the GSM standard (radio transmission system in accordance with the recommendations of the CEPT sub-committee Group Special Mobile or Global System for Mobile Communication, GSM) or in accordance with the DECT standard
  • the exchanged digital data can be digitized voice signals, data for fax communication or more generally data for stationary or mobile data processing systems, such as personal computers or notebooks.
  • the DECT cordless telephone and the GSM mobile radio telephone are preferably audio message transmission systems which communicate in a radio network on predetermined transmission and reception channels via radio waves. It often happens that the reception on individual channels or frequencies is disturbed by the radio's own emission.
  • the term two-way radio here generally stands for a telephone that is wirelessly integrated into a radio network.
  • the disturbances come from harmonics from clocks required for signal processing, for example a system clock. In order to reduce these disturbances, complex shielding measures are necessary, especially within the device. With GSM, all signal processing clocks must be derived from a single system clock.
  • the invention has for its object to provide a method of the type mentioned.
  • the method according to the invention for reducing the interference in reception channels of a radio device caused by harmonics of a system clock or for reducing the interference in reception channels of radio devices in a radio network caused by harmonics of a system clock does not require any complex shielding measures in the radio device.
  • FIG. 1 shows the block diagram of a mobile radio device with the circuit blocks relevant to the invention
  • FIG 3 shows the position of a harmonic interference in a mobile radio device designed according to the invention.
  • the invention is based on the basic idea that the interference caused by the harmonics is at least reduced if the frequency of the interference is not centrally in the reception channel, but outside the bandwidth of the reception channel, for example between adjacent channels.
  • the receiving channels are defined so that the harmonics of the System clock caused interference is not in the center of a receiving channel.
  • the receive channels are placed so that the interference is outside the bandwidth of the receive channels, for example between two adjacent channels. Then the interference for each of the channels concerned is smaller than if a channel were centrally affected. This is an improvement, since generally no medium input sensitivity is required, but the requirements apply equally to all channels.
  • a somewhat changed system clock is used instead of the actual system clock specified by the definition of the signal modulation. This embodiment of the invention is described in more detail below.
  • FIG. 1 shows a mobile radio device MF, which is connected via an antenna A to a mobile radio system, not shown.
  • the antenna A is connected to a radio device FE which has an HF transceiver HSE.
  • the radio device FE is connected to a logic circuit LS.
  • the logic circuit LS is used for digital signal processing of the data transmitted between the mobile radio MF and the mobile radio system and for controlling the mobile radio MF itself.
  • a user interface and other circuit parts are of minor importance for the invention and are not shown in the drawing.
  • the HF transceiver device HSE is connected to a modulator-demodulator device MD.
  • the transmit and receive frequencies of the RF transmit / receive device HSE are regulated by a synthesizer SZ.
  • the reception period in the modulator-demodulator device MD is set, for example, by a period counter PZ. From the modulator demo dulator device MD, the demodulated received signal is passed on to the logic circuit LS.
  • a system clock is generated using a quartz QU in the radio device FE.
  • This system clock controls the HF transceiver HSE via the synthesizer SZ and the modulator-demodulator device MD via the period counter PZ. This is symbolically represented by the arrows P1 and P2.
  • the clocks and counter readings required for signal processing are derived from the system clock.
  • the receive frequency in the HF transceiver HSE is set by the system clock by means of the multiplication or division factor set in the synthesizer SZ.
  • the system cycle also determines the period duration by the end value of the counter reading in the period counter PZ.
  • the disturbance in FIG. 2 is located centrally in channel n.
  • the period is generated by the period counter PZ, which counts with a counting frequency of 0.462 us up to a final value of 10,000.
  • the interference is placed on the area outside the channel bandwidth, for example between the two adjacent channels n and n + 1.
  • System clock 13,0001 MHz
  • the original period of 4.62 ms is created from the changed system cycle by counting up to a final value of 9,999 instead of a final value of 10,000. This results in an inaccuracy of a maximum of half a cycle for all derived signals. This inaccuracy is tolerated by the GSM system.
  • the reception frequency is generated in a manner known per se from the system clock using the synthesizer SZ.
  • the frequency of the quartz QU changed due to the changed system clock must be taken into account.
  • the division or multiplication factor is increased or reduced in such a way that the original, predetermined value for the reception frequency is reached again.
  • the synthesizer can only be programmed in discrete steps, these steps must be fine enough to be able to set the reception frequency with the required accuracy.
  • the frequency of the quartz QU may have to be detuned slightly in order to achieve this accuracy. Such fine adjustment of the quartz QU is carried out anyway to correct the temperature drift and to compensate for the scatter of specimens.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)

Abstract

L'invention concerne un procédé permettant de réduire une interférence, due aux ondes harmoniques d'un signal d'horloge de système, dans les canaux de réception d'un appareil de radiotéléphonie, selon lequel, au moins un signal d'horloge de réception dont la valeur de fréquence est prédéterminée est dérivé du signal d'horloge de système pour la connexion à un réseau radio à des fins de réception. Par une petite modification de la fréquence du signal d'horloge de système, l'interférence est décalée de façon à entrer dans la zone située à l'extérieur de la largeur de bande du canal de réception, et le signal d'horloge de réception est régulé en fonction de la valeur de fréquence prédéterminée.
PCT/DE1997/001677 1996-08-27 1997-08-07 Procede de reduction de l'interference interne dans des appareils radio mobiles WO1998009393A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19634613.4 1996-08-27
DE19634613 1996-08-27

Publications (1)

Publication Number Publication Date
WO1998009393A1 true WO1998009393A1 (fr) 1998-03-05

Family

ID=7803823

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1997/001677 WO1998009393A1 (fr) 1996-08-27 1997-08-07 Procede de reduction de l'interference interne dans des appareils radio mobiles

Country Status (1)

Country Link
WO (1) WO1998009393A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0988707A2 (fr) * 1998-03-20 2000-03-29 Koninklijke Philips Electronics N.V. Recepteur avec generateur de signal d'horloge
WO2001031798A1 (fr) * 1999-10-22 2001-05-03 Telefonaktiebolaget Lm Ericsson (Publ) Terminal de communications ayant un recepteur et procede d'elimination de perturbations connues d'un signal de frequence intermediaire numerise

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0418149A2 (fr) * 1989-09-13 1991-03-20 Sony Corporation Radio-récepteur du type synthétiseur commandé par microordinateur
GB2276784A (en) * 1993-03-22 1994-10-05 Motorola Gmbh Shifting spurious frequencies away from received frequency
WO1996037978A1 (fr) * 1995-05-23 1996-11-28 Microunity Systems Engineering, Inc. Reduction du bruit dans les circuits integres et les ensembles de circuits

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0418149A2 (fr) * 1989-09-13 1991-03-20 Sony Corporation Radio-récepteur du type synthétiseur commandé par microordinateur
GB2276784A (en) * 1993-03-22 1994-10-05 Motorola Gmbh Shifting spurious frequencies away from received frequency
WO1996037978A1 (fr) * 1995-05-23 1996-11-28 Microunity Systems Engineering, Inc. Reduction du bruit dans les circuits integres et les ensembles de circuits

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0988707A2 (fr) * 1998-03-20 2000-03-29 Koninklijke Philips Electronics N.V. Recepteur avec generateur de signal d'horloge
WO2001031798A1 (fr) * 1999-10-22 2001-05-03 Telefonaktiebolaget Lm Ericsson (Publ) Terminal de communications ayant un recepteur et procede d'elimination de perturbations connues d'un signal de frequence intermediaire numerise
US6373909B2 (en) 1999-10-22 2002-04-16 Telefonaktiebolaget Lm Ericsson (Publ) Communications terminal having a receiver and method for removing known interferers from a digitized intermediate frequency signal
CN100392988C (zh) * 1999-10-22 2008-06-04 艾利森电话股份有限公司 具有从数字化中频信号中消除已知干扰信号的接收机的通信终端和从数字化中频信号中消除已知干扰信号的方法

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