EP0956649A1 - Adaptive radio receiver apparatus - Google Patents

Adaptive radio receiver apparatus

Info

Publication number
EP0956649A1
EP0956649A1 EP97915810A EP97915810A EP0956649A1 EP 0956649 A1 EP0956649 A1 EP 0956649A1 EP 97915810 A EP97915810 A EP 97915810A EP 97915810 A EP97915810 A EP 97915810A EP 0956649 A1 EP0956649 A1 EP 0956649A1
Authority
EP
European Patent Office
Prior art keywords
amplifier
controllable
control unit
operating parameters
amplifier stage
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Withdrawn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
EP97915810A
Other languages
German (de)
French (fr)
Inventor
Torbjörn JOHNSON
Jens Malmgren
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.)
Radio Design Innovation AB
Original Assignee
Radio Design Innovation AB
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 Radio Design Innovation AB filed Critical Radio Design Innovation AB
Publication of EP0956649A1 publication Critical patent/EP0956649A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • H03G3/3068—Circuits generating control signals for both R.F. and I.F. stages
    • 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
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal

Definitions

  • the present invention relates to an adaptive radio .re ⁇ ceiver apparatus and, more specifically, a radio receiver suitable for use in a base station or a mobile telephone in a telecommunication system or a telecommunication system having radio in the local loop.
  • the radio receiver is c ⁇ n- trollable for optimising operating parameters of the ampli ⁇ fication circuits included in the receiver, e.g. gain, noise figure, blocking and IP3 intercept levels, in dependence of the traffic situation in which the receiver is located.
  • the radio receiver in accordance with the invention utilises controllable amplifiers and adaptive control logic for con ⁇ trolling the operating parameters.
  • the receiver In the base stations and mobile stations or other radio terminals of today the receiver is designed as a compromise mainly between intercept/blocking level and noise figure. This results in a quite modest performance in both respects. Thus, the problem is that a general receiver is not suitable for the various traffic situations encountered in a telecom- munication system.
  • a solution is to make one type of base station for areas with intensive traffic, typically cities, having high intercept level and poor noise figure, and another type of base station for areas with low traffic intensity, such as rural areas, having low noise figure and low intercept level.
  • the traffic situation is not stable, but the requirements may vary with time.
  • the present invention proposes to solve the problem stated above by providing an adaptive radio receiver appara- tus which may be optimised with respect to one or more of a plurality of operating parameters. This means that the same receiver may be used in all environments and having the best performance possible and the power consumption may also be reduced in accordance with the traffic environment.
  • the present invention provides an adaptive radio re ⁇ ceiver apparatus connected to an antenna, a duplex filter, a local oscillator and a mixer as is conventional in the art.
  • the receiver appara ⁇ tus comprises at least one controllable amplifier stage which is under control from a control unit for varying the operating parameters of the amplifier stage in dependence of the environment .
  • the amplifier * stage preferably includes a controllable low noise amplifier and a variable attenuation attenuator.
  • the receiver apparatus has the capacity of con ⁇ trolling the operating parameters such as the blocking level, the intercept level, the sensitivity, the noise figure, the power consumption and the gain.
  • the control unit comprises control logic for forming combinations of the ope ⁇ rating parameters, each combination corresponding to a spe ⁇ cific traffic situation.
  • Figure 1 is a circuit diagram of a first embodiment of the invention having a frequency independent splitter
  • Figure 2 is a circuit diagram of another embodiment of the invention in which the signal is split into different frequency bands
  • Figure 3 is a circuit diagram of an alternative em- bodiment of a controllable amplifier in accordance with the invention.
  • receivers of e.g. base stations of mobile telecommunication systems have different require ⁇ ments in dependence of the environment in which they are to be used.
  • Figure 1 describes how such an adaptive radio receiver is realized in accordance with one embodiment of the inven ⁇ tion.
  • the receiver is connected to an antenna through a duplex filter DPX as is conventional.
  • the receiver comprises low noise amplifiers GI and G2 and a splitter SP1, splitting the signal such that a plurality of radio channels may be received at the same time.
  • the signal i ⁇ split by the splitter and then mixed into tuned receivers of which only the first mixer MIX11 is shown.
  • the signal is divided by a filter bank Fll, F21, F31, in which each filter corresponds to one radio channel .
  • the receiver apparatus is optimised by varying the attenuation of variable attenuators Al, A2, A3, A13 and by varying the bias of the amplifiers
  • a control unit controls the bias of the various components .
  • the attenuators Al, A2, A3, A4 and A13 receive the bias voltages Ul, U4, U7, U10 and U16, respectively.
  • the amplifier units GI, G2 and G12 receive the bias voltages U3 , U6, and Ull, respectively, as well as the bias currents II, 12 and 112, respectively. Since the input impedances of the amplifiers GI, G2 are affected by the bias there are variable matching networks Ml, M2 in front of the amplifiers Gl, G2.
  • the matching net ⁇ works may be implemented e.g. by varactors or PIN diodes and are controlled by the input voltages U2 and U5.
  • variable attenuators Al and A2 have been introduced in front of the amplifiers.
  • the attenuators may consist of PIN diodes and may also contain capacitive and reactive components to provide broad band characteristics and optimal work load. These may also attenuate the input signal in those cases when a current lean function mode is used, as Gl and G2 may sustain lower input power without being overloaded.
  • the output level of G2 is measured by the directional coupler with detector DC2 and the result of the measurement is used to adjust the bias of Gl and G2 (and Ml, M2) as well as the attenuation of Al, A2.
  • the output signal of G2 will be relatively small and in that case the mixer MIX11 is not required to have a large LO power. Thereby, the gain of the buffer stage G12 may be lowered by decreasing the bias Ull, 112. In order to prevent overloading of MIX11 the signal may be attenuated in A13.
  • phase shifter PS In case the receiver is used together with a phase con- trolled antenna the phase shift is required to be identical in the various receivers. For this reason, a signal from an oscillator OSC is injected through the directional coupler DCI and the signal after the amplifiers is measured in the comparator C0MP1.
  • the attenuator A4 may be used to set the right level of COMP1 such that the phase is measured cor ⁇ rectly, and the result of the phase measurement S5 is used to control the variable phase shifter PS using the voltage U8 such that the correct phase orientation is maintained.
  • the table below shows four examples of various setting yielding various performance of the receiver apparatus.
  • the values shown refers to the circuit diagram of Figure 1, the gain being the total gain of the apparatus.
  • the four cases are well adapted to the traffic cases mentioned above.
  • many intermediate cases and combinations are possible in order to optimise for different conditions.
  • DCI Downlink Control
  • DC2 Downlink Control
  • DC3 a portion of the power received is coupled to a detector measuring the strength of the strongest incoming signal. This information is supplied to a control unit, herein referenced as Multicoupler Controller.
  • a temperature sensor may be included to optimise the bias of the transistors of the amplifiers as a function of the temperature.
  • the signal S7 from the temperature sensor may be included to optimise the bias of the transistors of the amplifiers as a function of the temperature.
  • SUBSTITUTE SHEET is also supplied to the controlled unit .
  • the temperature sensor is preferably located near the various components.
  • the entire apparatus is controlled by the Multicoupler Controller through the various voltages and currents to the attenuators and amplifiers.
  • the Multicoupler Controller also receives input data from a Base Site Controller BSC, the de ⁇ tectors DCI, DC12, DC13, and from the temperature sensor.
  • the control unit may be a single chip processor.
  • the power consumption of the amplifier G12 may be optimised using the control unit.
  • the amplifier G12 associated with the local oscillator LOll and the mixer MIX11 is used to control the LO power to the mixer and receives an input voltage Ull and input current 112 controlled by the control unit.
  • a high intercept level requires a high local oscillator power, contrary to other operating modes. This fact is used to optimize the LO amplifier in the same way as the other amplifiers of the receiver.
  • FIG. 2 shows another embodiment of the invention in which a filter bank comprising filters Fll, F21, F31 are set to pass certain frequencies to respective amplifier channels.
  • the filters are set such that the two branches ⁇ from the splitter SP2 pass alternate channels. In this way, the pass frequencies of the filters of one branch may overlap filters of the other branch without losses since the overlap does not occur in the same physical line. Thus, con ⁇ tinuous channel coverage is obtained.
  • the separate channels enable an individual setting or matching of the amplifiers of each channel.
  • Each amplifier channel comprises similar components to the embodiment of Figure 1, for which reason they are not described again in great detail.
  • an alternative embodiment of the first amplifier Gl in Figures 1 and 2 is replaced by a number, e.g. two or four, of amplifier units connected in parallel.
  • the amplifiers Gl, G2, G3, G4 may be switched on or off by a switch network comprising eight switches SW1 to SW8.
  • the impedance values are calculated to ensure that the input impedance and output impedance of the amplifier circuit is maintained at the correct value, typically 50 ⁇ , irrespective of the number of activated amplifier units, as is well known in the art.
  • the switches SW1-SW4 and SW9-SW10 together with the transmission lines TRL1-TRL7 are used to maintain match to 50 ohm inde ⁇ pendently of the number of amplifiers that are connected.
  • the input impedance of the amplifiers G1-G4, which are 50 ohm in this example, are transformed to 30 ohm by the transmission line TRL.
  • SW1 When one amplifier is disconnected (e.g. Gl) , SW1 connects TRLl to ground. This ground connection will trans ⁇ form to an open circuit at the connecting point A, and thus will have no effect on matching.
  • the impedance seen at point A when looking into the amplifiers G1-G2 will depend on the number of amplifiers connected in parallel:
  • the switches SW9-SW10 and TRL5-TRL7 are used to trans ⁇ form these impedances to 50 ohm.
  • the switches will be in the following position depending on the number of amplifiers connected: Numbers of amplifiers SW9 SW10
  • TRL6 and TRL5 are connected in parallel with TRL7, or connected to ground depending on the position of switches SW9 and SW10. When they are connected to ground, the short- circuit will be transformed to an open circuit at the other end of the transmission line. The open circuit line will not have any impact on the rest- of the circuit. When they are connected in parallel, the characteristic impedance of the resulting line is changed in the same way as when two re ⁇ sistors are connected in parallel. These different characte- ristic impedances are used to obtain matching to 50 ohm.

Landscapes

  • Amplifiers (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

The invention relates to an adaptive radio receiver apparatus suitable for use in a base station or a mobile telephone in a telecommunication system or a telecommunication system having radio in the local loop. The radio receiver is controllable for optimising operating parameters of the amplification circuits included in the receiver, in dependence of the traffic situation in which the receiver is located. The radio receiver in accordance with the invention utilises controllable amplifiers and adaptive control logic for controlling the operating parameters. The receiver apparatus comprises at least one controllable amplifier stage which is under control from a control unit for varying the operating parameters of the amplifier stage in dependence of the environment. The amplifier stage preferably includes a controllable low noise amplifier and a variable attenuation attenuator. Preferably the receiver apparatus has the capacity of controlling the operating parameters such as the blocking level, the intercept level, the sensitivity, the noise figure, the power consumption and the gain. The control unit comprises control logic for forming combinations of the operating parameters, each combination corresponding to a specific traffic situation.

Description

TITLE OF INVENTION: ADAPTIVE RADIO RECEIVER APPARATUS
FIELD OF THE INVENTION The present invention relates to an adaptive radio .re¬ ceiver apparatus and, more specifically, a radio receiver suitable for use in a base station or a mobile telephone in a telecommunication system or a telecommunication system having radio in the local loop. The radio receiver is cόn- trollable for optimising operating parameters of the ampli¬ fication circuits included in the receiver, e.g. gain, noise figure, blocking and IP3 intercept levels, in dependence of the traffic situation in which the receiver is located. The radio receiver in accordance with the invention utilises controllable amplifiers and adaptive control logic for con¬ trolling the operating parameters.
STATE OF THE ART
In the base stations and mobile stations or other radio terminals of today the receiver is designed as a compromise mainly between intercept/blocking level and noise figure. This results in a quite modest performance in both respects. Thus, the problem is that a general receiver is not suitable for the various traffic situations encountered in a telecom- munication system.
A solution is to make one type of base station for areas with intensive traffic, typically cities, having high intercept level and poor noise figure, and another type of base station for areas with low traffic intensity, such as rural areas, having low noise figure and low intercept level. However, this means a logistical problem, results in smaller series and consequently, higher costs. Also, the traffic situation is not stable, but the requirements may vary with time. Today, there is no technology for optimising the per- formance of the receiver with respect to the traffic environment .
The present invention proposes to solve the problem stated above by providing an adaptive radio receiver appara- tus which may be optimised with respect to one or more of a plurality of operating parameters. This means that the same receiver may be used in all environments and having the best performance possible and the power consumption may also be reduced in accordance with the traffic environment.
SUMMARY QF THE INVENTION
The present invention provides an adaptive radio re¬ ceiver apparatus connected to an antenna, a duplex filter, a local oscillator and a mixer as is conventional in the art. In accordance with the invention, the receiver appara¬ tus comprises at least one controllable amplifier stage which is under control from a control unit for varying the operating parameters of the amplifier stage in dependence of the environment . The amplifier* stage preferably includes a controllable low noise amplifier and a variable attenuation attenuator. Preferably the receiver apparatus has the capacity of con¬ trolling the operating parameters such as the blocking level, the intercept level, the sensitivity, the noise figure, the power consumption and the gain. The control unit comprises control logic for forming combinations of the ope¬ rating parameters, each combination corresponding to a spe¬ cific traffic situation.
Further embodiments of the invention are set forth in detail in the accompanying claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described below with reference to the attached drawings in which, Figure 1 is a circuit diagram of a first embodiment of the invention having a frequency independent splitter,
Figure 2 is a circuit diagram of another embodiment of the invention in which the signal is split into different frequency bands, and Figure 3 is a circuit diagram of an alternative em- bodiment of a controllable amplifier in accordance with the invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS As is mentioned above, receivers of e.g. base stations of mobile telecommunication systems have different require¬ ments in dependence of the environment in which they are to be used. Below is an example of a non-exhaustive list of common traffic cases : 1) In areas with low traffic intensity, it is desired to locate the base . stations as sparsely as possible. In this case, the best possible sensitivity is required of the re¬ ceiver. Then the receiver is to be designed such that the best possible noise figure is achieved. The amount of sig- nals received are on the other hand quite small, in which case the risk of interference or blocking is very small.
2) In a situation with high traffic load a large amount of signals is received, of which not all are interesting. The other signals may disturb the reception of the desired signal by forming intermodulation products in the receiver or because the receiver is blocked by strong undesired sig¬ nals. In this case, the receiver is to be designed such that the best possible tolerance -to undesired signals are achieved (high intercept and blocking level) . On the other hand, the reception sensitivity is not very important.
3) The requirement of low power consumption is self- evident in a battery powered mobile telephone, but is also desired e.g. in microcells or smaller, in which it is con¬ templated to power the base station by solar or wind power. Also in areas having poor infrastructure, it may be a great advantage having low power consumption. In large base sta¬ tions having many transponders the power requirement may be very large with associated cooling problems. This, too, re¬ quires a lower power consumption. 4) In some situations, it may be desirable to have the largest possible gain from the receiver. This enables a cost effective upgrading of older base stations where the re¬ ceiver has poor noise figure (typically 9 dB) and low gain instead of substituting new expensive base stations there- for. Figure 1 describes how such an adaptive radio receiver is realized in accordance with one embodiment of the inven¬ tion. The receiver is connected to an antenna through a duplex filter DPX as is conventional. The receiver comprises low noise amplifiers GI and G2 and a splitter SP1, splitting the signal such that a plurality of radio channels may be received at the same time. In the embodiment of Figure 1 the signal iε split by the splitter and then mixed into tuned receivers of which only the first mixer MIX11 is shown. In the embodiment of Figure 2, the signal is divided by a filter bank Fll, F21, F31, in which each filter corresponds to one radio channel .
Reverting to Figure 1, the receiver apparatus is optimised by varying the attenuation of variable attenuators Al, A2, A3, A13 and by varying the bias of the amplifiers
GI, G2, by changing the input voltages U... and input currents I....
As is described below a control unit (Multicoupler controller) controls the bias of the various components . The attenuators Al, A2, A3, A4 and A13 receive the bias voltages Ul, U4, U7, U10 and U16, respectively. The amplifier units GI, G2 and G12 receive the bias voltages U3 , U6, and Ull, respectively, as well as the bias currents II, 12 and 112, respectively. Since the input impedances of the amplifiers GI, G2 are affected by the bias there are variable matching networks Ml, M2 in front of the amplifiers Gl, G2. The matching net¬ works may be implemented e.g. by varactors or PIN diodes and are controlled by the input voltages U2 and U5. In case of high input signals the amplifiers Gl and G2 are overloaded. To prevent this, the variable attenuators Al and A2 have been introduced in front of the amplifiers. The attenuators may consist of PIN diodes and may also contain capacitive and reactive components to provide broad band characteristics and optimal work load. These may also attenuate the input signal in those cases when a current lean function mode is used, as Gl and G2 may sustain lower input power without being overloaded.
The output level of G2 is measured by the directional coupler with detector DC2 and the result of the measurement is used to adjust the bias of Gl and G2 (and Ml, M2) as well as the attenuation of Al, A2.
In the current lean mode the output signal of G2 will be relatively small and in that case the mixer MIX11 is not required to have a large LO power. Thereby, the gain of the buffer stage G12 may be lowered by decreasing the bias Ull, 112. In order to prevent overloading of MIX11 the signal may be attenuated in A13.
In case the receiver is used together with a phase con- trolled antenna the phase shift is required to be identical in the various receivers. For this reason, a signal from an oscillator OSC is injected through the directional coupler DCI and the signal after the amplifiers is measured in the comparator C0MP1. The attenuator A4 may be used to set the right level of COMP1 such that the phase is measured cor¬ rectly, and the result of the phase measurement S5 is used to control the variable phase shifter PS using the voltage U8 such that the correct phase orientation is maintained.
The table below shows four examples of various setting yielding various performance of the receiver apparatus. The values shown refers to the circuit diagram of Figure 1, the gain being the total gain of the apparatus.
Case Al U3 II A2 U6 12 A3 NF IIP3 PDC Gain
1 OdB 3V 10mA OdB 5V 60mA OdB 0,6dB OdBm 330mW 26dB
2 -12dB 5V 60mA -12dB 5V 120mA -12dB 18dB 25dBm 975mW -lldB
3 OdB 3V 5mA OdB 3V 10mA OdB l,8dB -7dBm 45mW 25dB
4 OdB 3V 20mA OdB 3V 60mA OdB 1, 2dB -3dBm 240mW 29dB
As may be seen from the table, the four cases are well adapted to the traffic cases mentioned above. Of course, many intermediate cases and combinations are possible in order to optimise for different conditions.
In DCI, DC2, DC3 a portion of the power received is coupled to a detector measuring the strength of the strongest incoming signal. This information is supplied to a control unit, herein referenced as Multicoupler Controller.
A temperature sensor may be included to optimise the bias of the transistors of the amplifiers as a function of the temperature. The signal S7 from the temperature sensor
SUBSTITUTE SHEET is also supplied to the controlled unit . The temperature sensor is preferably located near the various components.
The entire apparatus is controlled by the Multicoupler Controller through the various voltages and currents to the attenuators and amplifiers. The Multicoupler Controller also receives input data from a Base Site Controller BSC, the de¬ tectors DCI, DC12, DC13, and from the temperature sensor. The control unit may be a single chip processor.
Also the power consumption of the amplifier G12 may be optimised using the control unit. The amplifier G12 associated with the local oscillator LOll and the mixer MIX11 is used to control the LO power to the mixer and receives an input voltage Ull and input current 112 controlled by the control unit. A high intercept level requires a high local oscillator power, contrary to other operating modes. This fact is used to optimize the LO amplifier in the same way as the other amplifiers of the receiver.
Figure 2 shows another embodiment of the invention in which a filter bank comprising filters Fll, F21, F31 are set to pass certain frequencies to respective amplifier channels. The filters are set such that the two branches ■ from the splitter SP2 pass alternate channels. In this way, the pass frequencies of the filters of one branch may overlap filters of the other branch without losses since the overlap does not occur in the same physical line. Thus, con¬ tinuous channel coverage is obtained.
The separate channels enable an individual setting or matching of the amplifiers of each channel. Each amplifier channel comprises similar components to the embodiment of Figure 1, for which reason they are not described again in great detail.
In Figure 3 an alternative embodiment of the first amplifier Gl in Figures 1 and 2 is replaced by a number, e.g. two or four, of amplifier units connected in parallel. The amplifiers Gl, G2, G3, G4 may be switched on or off by a switch network comprising eight switches SW1 to SW8. A number of transmission lines having the length L λ/4 and the characteristic impedances Z 39, 66 or 94. The impedance values are calculated to ensure that the input impedance and output impedance of the amplifier circuit is maintained at the correct value, typically 50 Ω, irrespective of the number of activated amplifier units, as is well known in the art. When a high input level is to be handled all the ampli- fier units are enabled by controlling the switches, re¬ sulting in good tolerance to intermodulation and blocking. The noise figure is also quite good. When it is desired to reduce the power consumption the amplifiers are disconnected as is described below. Thereby, the intermodulation and blocking levels are decreased as well as the power requirement . Another advantage of this amplifier arrangement is that a redundancy is achieved in case of failure in one or several amplifier units.
Four, two or one amplifier can be used at a time. The switches SW1-SW4 and SW9-SW10 together with the transmission lines TRL1-TRL7 are used to maintain match to 50 ohm inde¬ pendently of the number of amplifiers that are connected.
The transformations that are mentioned in the following text are all according to established transmission line theory.
The input impedance of the amplifiers G1-G4, which are 50 ohm in this example, are transformed to 30 ohm by the transmission line TRL.
When one amplifier is disconnected (e.g. Gl) , SW1 connects TRLl to ground. This ground connection will trans¬ form to an open circuit at the connecting point A, and thus will have no effect on matching.
The impedance seen at point A when looking into the amplifiers G1-G2 will depend on the number of amplifiers connected in parallel:
1 amplifier 30 ohm
2 amplifiers 15 ohm 4 amplifiers 7,5 ohm
The switches SW9-SW10 and TRL5-TRL7 are used to trans¬ form these impedances to 50 ohm. The switches will be in the following position depending on the number of amplifiers connected: Numbers of amplifiers SW9 SW10
1 2 1
2 2 2 4 1 2
TRL6 and TRL5 are connected in parallel with TRL7, or connected to ground depending on the position of switches SW9 and SW10. When they are connected to ground, the short- circuit will be transformed to an open circuit at the other end of the transmission line. The open circuit line will not have any impact on the rest- of the circuit. When they are connected in parallel, the characteristic impedance of the resulting line is changed in the same way as when two re¬ sistors are connected in parallel. These different characte- ristic impedances are used to obtain matching to 50 ohm.
While the present invention has been described in de¬ tail with respect to the disclosed embodiments, several variations and modifications of the apparatus are intended to fall within the scope of the present application as de- fined by the claims below.

Claims

1. Adaptive radio receiver apparatus connected to an antenna, a duplex filter (DPX) , a local oscillator (LO) and a mixer (MIX) characterised by at least one controllable amplifier stage which is under control from a control unit for varying the operating parameters of the amplifier stage in dependence of the environment .
2. Apparatus according to claim 1, characterised in that the amplifier stage includes a controllable low noise am- plifier (G...) and a variable attenuation attenuator (A...) .
3. Apparatus according to claim 1 or 2, characterised by an output level detecting device (DC2;DC11,DC21,DC31) for detecting the signal strength from the amplifier stage and supplying the information as input data (S...) to the control unit.
4. Apparatus according to any one of the preceding claims, characterised by an oscillator (OSC) for injecting a signal before the amplifier stage, the signal being passed through the amplifier stage and then extracted and compared in a comparator (COMP1) for controlling the phase character¬ istics of the amplifier stage by means of a phase shifter (PS;PS11,PS21,PS31) .
5. Apparatus according to any one of the preceding claims, characterised by a temperature sensor (TEMP) for sensing the temperature of the apparatus and supplying the information as input data (S7;U4) to the control unit.
6. Apparatus according to any one of the preceding claims, characterised by comprising two amplifier stages for amplifying a plurality of radio channels and further com- prising a frequency independent splitter connected to ampli¬ fiers tuned to different frequencies.
7. Apparatus according to any one of claims 1 to 5, characterised by comprising two amplifier stages for ampli¬ fying a plurality of radio channels and further comprising a filter bank (F...) interposed between the amplifier stages for dividing the signal to the second amplifier stage comprising a plurality of amplifier channels, each having controllable gain, the separate amplifier channels enabling an individual setting or matching of amplifier units of each amplifier channel.
8. Apparatus according to any one of the preceding claims, characterised by a variable matching network (M...) for controlling the input impedance of the amplifier stage.
9. Apparatus according to any one of the preceding claims, characterised by a controllable amplifier
(G12;G22,G32) associated with the local oscillator (LO) and the mixer for controlling the power consumption of the local oscillator amplifier by the control unit.
10. Apparatus according to any one of the preceding claims, characterised by directional couplers (DC.) as the detector units.
11. Apparatus according to any one of the preceding claims, characterised in that a controllable amplifier com¬ prises a number of amplifier units (Gl,G2,G3 ,G4) connected in parallel, wherein the operating parameters are controlled by the number of amplifier units put into operation by the control unit.
12. Apparatus according to claim 11, characterised by a switch network (SW...) for enabling the respective amplifier units and a number of transmission lines (TRL) having the length L λ/4 and characteristic impedances calculated to ensure that the input impedance and output impedance of the amplifier circuit is maintained at the correct value, irre¬ spective of the number of enabled amplifier units.
13. Apparatus according to any one of the preceding claims, characterised in that the control unit receives com¬ mand inputs from a base site controller (BSC) of a tele¬ communication system.
14. Apparatus according to any one of the preceding claims, characterised in that the controllable operating parameters are the blocking level, the intercept level, the sensitivity, the noise figure, the power consumption, and the gain.
15. Apparatus according to any one of the preceding claims, characterised in that the control unit comprises control logic for forming combinations of the operating parameters, each combination corresponding to a specific traffic situation.
EP97915810A 1996-04-29 1997-03-24 Adaptive radio receiver apparatus Withdrawn EP0956649A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9601620 1996-04-29
SE9601620A SE9601620L (en) 1996-04-29 1996-04-29 Customizable radio receiver apparatus
PCT/SE1997/000504 WO1997041643A1 (en) 1996-04-29 1997-03-24 Adaptive radio receiver apparatus

Publications (1)

Publication Number Publication Date
EP0956649A1 true EP0956649A1 (en) 1999-11-17

Family

ID=20402376

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97915810A Withdrawn EP0956649A1 (en) 1996-04-29 1997-03-24 Adaptive radio receiver apparatus

Country Status (5)

Country Link
EP (1) EP0956649A1 (en)
JP (1) JP2000509231A (en)
AU (1) AU2314097A (en)
SE (1) SE9601620L (en)
WO (1) WO1997041643A1 (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19801993A1 (en) * 1998-01-20 1999-07-22 Siemens Ag Mobile phone and method for operating a mobile phone
DE19829500A1 (en) * 1998-07-02 2000-01-13 Thomson Brandt Gmbh Method for improving the useful signal in a radio receiving unit
US6107878A (en) * 1998-08-06 2000-08-22 Qualcomm Incorporated Automatic gain control circuit for controlling multiple variable gain amplifier stages while estimating received signal power
US6487419B1 (en) 1998-08-06 2002-11-26 Ericsson Inc. Systems and methods for management of current consumption and performance in a receiver down converter of a wireless device
US6374083B1 (en) * 1999-03-01 2002-04-16 Nokia Corporation Apparatus, and associated method, for selectively modifying characteristics of the receive signal received at a receiving station
AU2002232654A1 (en) * 2000-12-28 2002-07-16 Conductus, Inc. Method and apparatus for adaptive gain control of rf telecommunication system
US6694129B2 (en) 2001-01-12 2004-02-17 Qualcomm, Incorporated Direct conversion digital domain control
EP1350332B1 (en) 2001-01-12 2017-11-29 Qualcomm Incorporated Direct conversion digital domain control
US7299021B2 (en) * 2001-12-28 2007-11-20 Nokia Corporation Method and apparatus for scaling the dynamic range of a receiver for continuously optimizing performance versus power consumption
EP1742374A1 (en) * 2001-12-28 2007-01-10 Nokia Corporation Method and apparatus for scaling the dynamic range of a receiver
JP2004088372A (en) 2002-08-27 2004-03-18 Renesas Technology Corp Receiver and radio communication terminal device using it
CN100344189C (en) * 2004-11-10 2007-10-17 郑长春 3G mobile communication network base station up-down power amplifying march-past combination unit
EP1710920A1 (en) * 2005-04-06 2006-10-11 Telefonaktiebolaget LM Ericsson (publ) Receiving modulated radio signals
US8838056B2 (en) 2011-06-28 2014-09-16 Xilinx, Inc. Receiver circuit
US9893752B2 (en) 2014-10-31 2018-02-13 Skyworks Solutions, Inc. Diversity receiver front end system with variable-gain amplifiers
US10050694B2 (en) 2014-10-31 2018-08-14 Skyworks Solution, Inc. Diversity receiver front end system with post-amplifier filters
US9571037B2 (en) 2014-10-31 2017-02-14 Skyworks Solutions, Inc. Diversity receiver front end system with impedance matching components
US9838056B2 (en) 2015-05-28 2017-12-05 Skyworks Solutions, Inc. Integrous signal combiner

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59230334A (en) * 1983-06-13 1984-12-24 Fujitsu Ltd Space diversity reception system
CA1319956C (en) * 1987-02-21 1993-07-06 Hirosada Atsuta Radio receiver with a received input level monitoring circuit
US5267272A (en) * 1988-10-24 1993-11-30 Hughes Aircraft Company Receiver automatic gain control (AGC)
FI83715C (en) * 1989-09-25 1991-08-12 Nokia Mobile Phones Ltd LOGIKSTYRD INTRIMNING OCH KOMPENSATION AV SIGNALNIVAOER OCH DEVIATIONER I EN RADIOTELEFON.
US4980656A (en) * 1989-12-01 1990-12-25 Motorola, Inc. Active input impedance tuner for compensating for power loss
FR2662879B1 (en) * 1990-05-30 1994-03-25 Alcatel Cit CENTRALIZED MAINTENANCE METHOD FOR A WIRELESS TELEPHONE NETWORK.
US5321849A (en) * 1991-05-22 1994-06-14 Southwestern Bell Technology Resources, Inc. System for controlling signal level at both ends of a transmission link based on a detected valve
GB2287157B (en) * 1994-02-02 1998-03-25 Nokia Telecommunications Oy Telecommunications systems

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9741643A1 *

Also Published As

Publication number Publication date
JP2000509231A (en) 2000-07-18
WO1997041643A1 (en) 1997-11-06
AU2314097A (en) 1997-11-19
SE9601620L (en) 1997-10-30
SE9601620D0 (en) 1996-04-29

Similar Documents

Publication Publication Date Title
WO1997041643A1 (en) Adaptive radio receiver apparatus
AU770637B2 (en) A radio transceiver and a method of preventing transmission spurious response
EP0149533B2 (en) Apparatus for receiving super high frequency signals
CN101159439B (en) Gain controlled processing receiver
EP0675605A2 (en) Dual mode transmission system
AU686890B2 (en) Transmitters for radio telephone base stations
US4985686A (en) Active load impedance control system for radio frequency power amplifiers
JP2000509229A (en) Transmitter coupler arrangement
EP0969601B1 (en) Method for improving the wanted signal in a radio receiving unit
US5233634A (en) Automatic gain control circuit in a radio telephone receiver
US20020077150A1 (en) Base station with antenna, including an amplifier, located at a distance from the base station
GB2304496A (en) Coupling radio transmitters to antenna elements
JPS61262308A (en) Power synthesis circuit
JPH08213919A (en) Radio transmitter output controller
JP3562472B2 (en) Feed forward amplifier
EP1020993A1 (en) Tuner
JPH0923176A (en) Diversity device
KR200211726Y1 (en) Divice for reciving radio frequency in basestaion for simulation
JPH04355527A (en) Transmission power control system
KR100299092B1 (en) Apparatus for processing as to radio frequency of base station
JP3713227B2 (en) Space diversity equipment
JPH033425A (en) Radio transmitter/receiver
JP2635651B2 (en) Space diversity receiver
WO1994021042A1 (en) Auto-tuning microwave filter
JP2002290179A (en) Automatic gain control circuit

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19981104

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FI FR GB SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20031001