EP1428329A1 - Systeme de reception a diversite d'antenne - Google Patents

Systeme de reception a diversite d'antenne

Info

Publication number
EP1428329A1
EP1428329A1 EP01980420A EP01980420A EP1428329A1 EP 1428329 A1 EP1428329 A1 EP 1428329A1 EP 01980420 A EP01980420 A EP 01980420A EP 01980420 A EP01980420 A EP 01980420A EP 1428329 A1 EP1428329 A1 EP 1428329A1
Authority
EP
European Patent Office
Prior art keywords
pilot signal
antenna diversity
antenna
pulse
receiving system
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Withdrawn
Application number
EP01980420A
Other languages
German (de)
English (en)
Inventor
Peter Wegner
Bernd Leinwetter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Molex CVS Hildesheim GmbH
Original Assignee
Receptec GmbH
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 Receptec GmbH filed Critical Receptec GmbH
Publication of EP1428329A1 publication Critical patent/EP1428329A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
    • H04B7/0814—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching based on current reception conditions, e.g. switching to different antenna when signal level is below threshold
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
    • H04B7/0808—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching comparing all antennas before reception

Definitions

  • the present invention relates to an antenna diversity receiving system of claim 1.
  • Such a receiver system is known from EP-A-0 792 031. It is specifically suited to be used in vehicles.
  • This well-known antenna diversity receiving system com- prising an antenna device including a plurality of FM antennas as well as controllable switching means for sequentially switching through one of said plurality of FM antennas via an antenna cable to a receiver upon reception of a switching control signal, the receiver comprising a multipath detector coupled to a pulse generator for generating a pulse signal at the detection of multipath interference .
  • the reception of wanted RF broadcast transmitter signal may be disturbed or otherwise deteriorated by various phenomena, such as multipath reception and/or adjacent channel interferences.
  • multipath reception is caused by signal reflections at and/or against environmental physical obstacles, such as mountains, trees, buildings, fences and the like. Due to such signal reflections and RF broadcasting signal may arrive at a certain reception location through various different signal paths, i.e. in various different amplitude and phase conditions.
  • the summation of these multipath signals at the antenna of the receiver results in unpredictable signal amplitude and/or phase distortions, most often effectuating in part or complete cancellation of the useful RF reception signal.
  • These signal cancellations hereinafter also being referred to as signal dips, strongly depend on the RF carrier frequency of the received RF broadcasting signal and on the location of reception.
  • EP-A-0 792 031 there are two cables between the antenna diversity box and the radio set installed remote of the antenna diversity box.
  • One cable is used to transmit the RF broadcast signals, whereby the other cable is used to transmit the pulse signals .
  • these signals utu- ally interfere, in particularly the pulse signals affected the useful FM RF broadcast signals and may become noticeable in the reproduction of new signals. That is why there has already been suggested an improved antenna diversity receiving system as described in the prior filed but not prior published European patent application with the filing number 97 102 027. The whole content of this prior filed but not prior published European patent application is referred to and is made to be part of the present application.
  • One of the main objectives of the European patent application referred to above is to provide an improved antenna diversity receiving system using a single antenna cable for the transmission of both useful FM RF broadcast sig- nals and pulsating switching control signals to secure an accurate detection of these pulsating switching control signals and to prevent these from disturbing the processing of the useful FM RF broadcast signals in the receiver.
  • a problem of the described diversity system concerns the fact that the external strong AM signals could trigger a counter in the separate antenna diversity box.
  • that counter may be a Johnson counter.
  • the output value of this counter varies with each switching control signal pulse of the control signal detector within a counting cycle whereby the number of values within the cycle corre- spond to the number of fixed antennas connected to the antenna diversity box. That is why these external strong AM signals might disturb the diversity function in case of simultaneously active FM and AM stages.
  • This advantage is received by introducing a separate pilot signal which may be switched between "on” and “off” .
  • This separate pilot signal is not able to adversely affect triggering and/or counting pulse signals to function and control the switching means of the diversity signal system.
  • a preferred embodiment of the antenna diversity receiving system in accordance to this invention is characterized by that the pilot signal is a sine signal (for example, preferred with a signal frequence of 22 kHz) . Based on this pilot signal it is possible to make the AM amplifier active, while the FM diversity is not active. This pilot signal is controlled in the radio set; i.e. is switched between "on” and “off” whereby this pilot signal is transferred from the radio set while the single antenna coax cable to the "antenna diversity box" .
  • the pilot signal generator provides a low signal if it is activated. Contrary thereto the pilot signal generator provides a high signal if it is inactivated. Is thereby preferred that the pilot signal generator is activated (producing a low signal) then the radio set is switched to
  • the pilot signal generator is producing a high signal if it is switched in inactivated condition if the radio set is switched to receive FM signals .
  • pilot signal detection and switch control controlling another switch for activating and inactivating an AM amplifier.
  • the pilot signal detection and switch control works in that way that the "high" signal is produced if AM reception is on.
  • the pilot signal may be used for diagnostics of system functions, too, together with a pulse generator circuit controlled by the DSP (Digital Signal Processor) in the radio set.
  • DSP Digital Signal Processor
  • the switching signal (changing form “low” under inactive condition to "high” under active condition) generated by the pilot signal can be used with well-known technics to generate signals for the following items:
  • the signal can be used to set the FM diversity to a defined start position (FM antenna) .
  • the invention describes a prac- tical solution for the generation of the diversity control signal, which is needed in case of a "one cable" diversity system. Further, the invention comprises a solution for the problem of diversity function disturbed by strong AM- signals when listening to FM unique elements which are:
  • the way one control signal is derived from, e.g. the available four control signals as supplied by a diversity IC, for example by the TEA6101; the way the requirement is met that the control signal should have a zero average value (in order to avoid interference by the control signal) ; the way with which by switching via a low frequency sine wave (pilot or encoded) signal technics the mentioned problem with strong AM-signals is solved; the possibility of providing diagnostics for AM/FM car reception system.
  • Figure 1 a preferred embodiment of an antenna diversity receiving system according to the invention comprising an antenna device coupled via an single antenna cable to a receiver;
  • Figure 2a a preferred embodiment of the multipath detector and a pulse generator for using in the antenna diversity receiving system of figure 1;
  • Figure 2b an other embodiment of a multipath detector and a pulse generator for use in the antenna diversity receiving system of figure 1;
  • Figure 3 A-D time plots of the multipath detector of figure 1 and
  • Figure 4a to 4c time plots of output signals of respectively the multipath de- tector, the pulse generator and the pulse shaper following said pulse generator of figure 1.
  • Figure 1 shows a blockdiagramm of a complete antenna diversity which makes use of the concerned invention.
  • the antenna diversity system comprises an antenna diversity box 1 and a radio set 3 partly referred hereafter as receiver 3.
  • the blockdiagramm in accordance to figure 1 shows an antenna structure consisting of four FM antennas 5 and one AM antenna 7. Other combinations of number of antennas and summary or/and difference of FM-antennas are in this circuitry possible, too.
  • Each antenna 5 is coupled with an entry 33a, 33b, 33c and 33d, respectively, of an FM-switch 33 via a band pass filter BP .
  • the output 33e of the FM-switch 33 is connected with an input of an FM-buffer 34 whereby the output 34b of the FM- buffer is intern connected via an AGC-circuitry with the input 34a of this FM-buffer 34.
  • the output 34b of the FM-buffer 34 is connected via an band pass filter BP with the output la of the an- tenna diversity box.
  • the antenna diversity box 1, i.e. the output la as well as the receiver 3, i.e. the input 3a, are connected via a single cable 9.
  • An AM/FM tuner 13 is equipped with a signal level detector which delivers a voltage, which is a measure for the field strength of the tuned antenna signal. As such, amplitude variations in the tuned antenna signal will lead to corresponding variations in the output of the level detector.
  • Both, the output of the level detector and the audio output (the MPX-signal) of the FM demodulator are supplied to the signal quality detection system, which is a part of the antenna diversity IC 15, e.g. the TEA6101.
  • This IC has four DC outputs A, B, C and D from which one has a value "high", this may be featured by an output signal which is "logic 1".
  • the other output has the value "low” (e.g. if the output is "logic 0").
  • the output pin with value "high” gets the value "low", while the value "high” is taken over by another output pin.
  • the transfer of the value "high” to another pin occurs sequentially (so far A to B to C to D and again to A ) .
  • the output pins A, B, C and D are connected to a pulse generator 19, which, according to the invention, generates a positive and a negative pulse each time the value "high" of one of the pins A, B, C, and D is transferred to another pin.
  • This pulse-couple (positive and negative pulses together) is supplied to the separate antenna diversity box 1 via the antenna coax cable 9 connection between this box 1 and the antenna input 13a of the receiver 13.
  • the coil LI serves to suppress somewhat the higher frequency contents of the pulse.
  • the receiver 3 further comprises an IF-Demodulator 21 the input of which is connected via a line 23 with one output 13b of the AM/FM tuner 13 in the audio path.
  • the IF-Demodulator provides a MPX-signal which is provided to one entry 15a of the diversity control system 15.
  • the signal S is led to speakers, e.g. via a not shown signal processor.
  • a second output 13c of the AM/FM tuner is connected with another input 15b of the diversity control 15 to put a strength signal to this input of the diversity control 15.
  • An output of the pulse generator 19 is coupled to a pulse shaper 25 comprising signal differentiating R1,L1,C for differentiating the standard rectangular pulse signal waveform of the pulse generator (referred to later on) to convert said rectangular pulse signal waveform into a pulse signal pair comprising a first signal pulse, or a first pulse spike, followed by a second signal pulse, or a second pulse spike, having a signal polarity opposite to the signal polarity of the first signal pulse, and occurring substantially during said first and second signal transients.
  • the overall waveform of the pulse signal pair therewith varies symmetrically around a reference level.
  • the pulse shaper 25 is coupled to a first coil or block coil LI providing a signal suppression within the frequency range of FM RF broadcast frequency band.
  • the antenna diversity box is also provided with a coil or block coil enumerated with L2.
  • the mentioned pulse couple is fed to a pulse converter 27, which transforms the pulse couple to a one single pulse which triggers a Johnson counter 29.
  • the pulse converter 27 takes care that the Johnson counter 29 is triggered on the positive rising edge of the positive pulse of the mentioned pulse couple (which can be achieved by means of well known technics) .
  • the Johnson counter 29 provides a pulse (1 out of a maximum of 10 outputs) to a switching matrix 31 for antenna combination and is led to an antenna switch 33 by means of choosing sequen- tially another antenna each time the Johnson counter is triggered.
  • the final result is that another antenna is chosen, each time the already mentioned signal quality detection system simultaneously detects a dip in the signal level and the distortion components above the stereo MPX spectrum. This procedure happens continuously in case of bad signal quality reception. In case of good signal quality reception at the antenna, no pulse is generated from the signal quality detection and the switching is stopped, up to a reception signal disturbance occurs.
  • the negative pulse of the mentioned pulse couple as generated by the pulse generator 19 is needed to maintain the energy average value of the pulse signal equal to zero. If this measure would not be taken, then random fluctuations in the average value of the pulse signal would occur with the risk of interferences.
  • the DC supply for the circuitry in the antenna diversity box can be obtained from the radio set 3, i.e. from the DC supply connection 35 via the antenna coax cable 9.
  • a DC supply circuitry 36 incorporated in the antenna diversity box the input of which is connected with the block coil L2.
  • the output of the DC supply conditioning unit 36 is connected with an switcher
  • Figures 2a and 2b show the basic principle of the pulse generator 19 according to the invention while figure3 shows an example of the sequential "high” / "low” switching of the pins A, B, C and D.
  • figure2a two identical circuits which comprise an exclusive OR function are connected to pins B and D, while pins A and C are not connected to some circuits.
  • the choice for pins B and D to be connected to the circuits with the exclusive OR functions is arbitrary. One could have chosen pins A and C.
  • the pulse generator 19 is so designed that only one of the outputs A, B, C or D has a high output voltage of digital "1" value. During such high output voltage or digital "1" value, one of the corresponding four FM antennas is to be switched trough via the antenna cable 9 to the RF receiver input 13a.
  • the description of the function of the Philips IC TEA6101 given so far is sufficient for a proper understanding of the invention. For further details reference is made to the relevant Philips IC Data Handbook of this IC.
  • the pin connectors B and D are coupled to exclusive OR gates Gl and G2 of the pulse generator 19 (respectively) directly as well as through delay elements R1C1 and R2C2, respectively.
  • Outputs of the exclusive OR gates Gl and G2 are coupled via a R3- or R4-element, respectively, with a summarizing point 39, which in turn is connected to a out- put 19a of the pulse generator 19, which is connected to the pulse shaper 25.
  • the delay elements R1C1 and R2C2 each comprise an RC cir- cuit delaying the supply of the digital value supplied at the pin connectors B and D over an RC time constant to one
  • a high or digital "1" value arising at e.g. pin con- nector D upon detection of a multipath distortions on a point in time tl, will immediately be supplied to the one input of the exclusive OR gate Gl and some time later at the other input of said exclusive OR gate Gl .
  • Figure 2b shows a very similar embodiment compared with the embodiment of figure 2a. The only difference is that the outputs of OR gates Gl and G2 are coupled to inputs of a non-exclusive OR gate G3 which is connected with the output 19a via an additional OR gate G4 and an R-element R5 and a C-element C4.
  • FIG 3 it is shown what will happen at the points of time tl and t2 when the antenna diversity box is activated.
  • Figure 4a shows the shape of the signals on the two inputs of the concerned exclusive OR, i.e. of the output of the diversity control 15. The shape difference between both signals is determined by the time constant of the R/C network, which is connected to one of the inputs of the exclusive OR. Due to the shape difference the output of the concerned excl . OR will have the value "high" for a short time, e.g. l ⁇ s (dependent on the time constant of the R/C network) thus leading to an output pulse like indicated in figure 4b.
  • a pulse shape like indicated in figure 4c is obtained.
  • This pulse shape then in fact is a combination of a positive and a negative pulse, earlier defined as "pulse couple" .
  • the positive pulse is finally used to trigger the Johnson counter 29, which drives the antenna switch 33 while the negative pulse is used to guarantee the average value of the total pulse signal is zero.
  • the desired differentiation of the output pulse is obtained by a right choice for the values of the resistor RI and coils LI, C4. (see figure 1) .
  • the impedance of the antenna cable at the antenna input of the radio set is roughly determined by tuner input impedance for frequencies in order of 0.1 to 1 MHz, being the frequency range, where the spectral energy of the pulses is concerned. It may further be clear that resistor RI can never be zero (zero would mean a short circuit for the pulses) . A practical value for RI lies in the order of 330 Ohm. Due to this, the AM-sig- nal, supplied by the antenna, should be buffered by an AM- bufferstage 43 as indicated in figure 1. Practically this means an active antenna for AM. For the FM antennas, active or passive is not relevant in this aspect. To avoid unde- sired charge accumulation which may disturb the AM buffer 43 the AM antenna 7 is connected with the AM buffer 43 via an protection circuitry ESD avoiding such an undesired charge accumulation.
  • a fundamental solution is using a pilot signal (for ex. : 22 kHz sine wave signal or other) to make the AM-am- plifier 43 active, while FM-diversity is not active.
  • This pilot signal is transferred from the radio set 3 via the antenna coax cable 9 to the antenna diversity box.
  • the pilot signal system comprises two important components:
  • the first component is the pilot signal generator 45, which is low when activated and high when inactivated (preferred realized by AM / FM switching at the tuner 13) .
  • Location of the transmitter of the pilot signal is in the radio set 3. Only low level is allowed because of activation level of the tuner AGC.
  • the pilot signal generator 45 is switched by a switcher unit 45. If the switcher unit 55 is switched into the state "AM on” the pilot signal generator 45 is connected via the switcher unit 55 with the DC supply connection 35. This connection is interrupted if the switcher unit 55 is switched into the state "FM off” .
  • the antenna diversity box 1 is the existence of the pilot signal and the switching pulse couple at the same time during FM reception not wanted, because of possible interference.
  • the pilot signal is active during AM reception.
  • the pilot frequency should be lower than broadband frequencies AM. This signal is used to switch the diversity box FM antenna 1 generally active, to make sure reception of FM broadband services for ex. RDS during AM reception.
  • the pilot signal can be used for diagnostics of system functions, too, together with the pulse generator circuit controlled by the DSP (Digital Signal Processor) in the radio set .
  • DSP Digital Signal Processor
  • a pilot signal detection circuitry 41 which detects the pilot signal and handles different functions.
  • the input 41a of the pilot signal detection is connected via the RF coax cable 9 to the radio set 3.
  • the signal can be used to set the FM diversity into defined start position
  • FM-Antenna 1 With additional single pulse couple from the pulse generator in the radio set and switching off the pilot signal again, FM-antenna 2 is. switched on. By repeat- ing sending a single pulse couple the next antenna and so on each antenna can be switched on and checked separately.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

La présente invention concerne un système de réception à diversité d'antenne amélioré, qui comprend un dispositif d'antenne présentant une pluralité d'antennes FM (5) et un système de commutation (33) pouvant être commandé et conçu pour commuter de manière séquentielle une desdites antennes FM (5) par un câble d'antenne (9) à un récepteur radio (3) dès réception du signal de commande de commutation. Ledit récepteur radio (3) comprend un détecteur de voies multiples (15) qui est couplé à un générateur d'impulsions (19) conçu pour produire un signal à impulsions lorsqu'une interférence de voies multiples est détectée, ainsi qu'un formeur d'impulsions (25) qui suit le générateur d'impulsions (19) et est conçu pour convertir le signal à impulsions du générateur d'impulsions en un signal à impulsions comprenant les caractéristiques supplémentaires suivantes : - il y a un générateur de signaux pilotes (45); - ce générateur de signaux pilotes (45) fournit un signal en fonction d'une commutation AM/FM; - il y a une commande de commutation de détection de signaux pilotes supplémentaire (41) qui est directement ou indirectement commandée par le générateur de signaux pilotes (45) par l'intermédiaire du câble (9); et la détection de signaux pilotes et la commande de commutation (41) permettent d'activer ou de ne pas activer la branche AM dans le boîtier à diversité d'antenne ou d'amplifier et/ou de couper un signal d'antenne AM.
EP01980420A 2001-09-20 2001-09-20 Systeme de reception a diversite d'antenne Withdrawn EP1428329A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2001/010915 WO2003028247A1 (fr) 2001-09-20 2001-09-20 Systeme de reception a diversite d'antenne

Publications (1)

Publication Number Publication Date
EP1428329A1 true EP1428329A1 (fr) 2004-06-16

Family

ID=8164597

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01980420A Withdrawn EP1428329A1 (fr) 2001-09-20 2001-09-20 Systeme de reception a diversite d'antenne

Country Status (2)

Country Link
EP (1) EP1428329A1 (fr)
WO (1) WO2003028247A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19538109A1 (de) * 1995-10-13 1997-04-17 Bayerische Motoren Werke Ag Schaltanordnung zur Steuerung eines Antennendiversitys für ein zugeordnetes Rundfunkgerät
DE19607045A1 (de) * 1996-02-24 1997-08-28 Lindenmeier Heinz Empfangsantennen-Scanningdiversitysystem für den Meterwellenbereich für Fahrzeuge
DE19910571A1 (de) * 1999-03-10 2000-09-14 Delphi Tech Inc Rundfunkempfangsvorrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03028247A1 *

Also Published As

Publication number Publication date
WO2003028247A1 (fr) 2003-04-03

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