CN102594431B - Tower mounted amplifier and antenna - Google Patents
Tower mounted amplifier and antenna Download PDFInfo
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- CN102594431B CN102594431B CN201110405757.5A CN201110405757A CN102594431B CN 102594431 B CN102594431 B CN 102594431B CN 201110405757 A CN201110405757 A CN 201110405757A CN 102594431 B CN102594431 B CN 102594431B
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Abstract
The embodiment of the invention provides a tower mounted amplifier and an antenna. The tower mounted amplifier comprises a transmitting filter circuit, a receiving filter circuit, and a signal collecting circuit, wherein the signal collecting circuit is connected with the receiving filter circuit and is used for collecting signals in a frequency acceptance band of the receiving filter circuit. According to the tower mounted amplifier and the antenna, the collection of the signals is facilitated, the introduction of other instruments or the simulation of working environments of collected targets in a laboratory are not needed, and the cost is reduced; and intermodulation interference effect produced by other instruments in the collecting process is avoided.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of tower amplifier, antenna.
Background technology
In communication system, when the different carrier signal of frequency of base station transmitting is propagated in the devices such as antenna, the interaction between multiple different frequency components that transmit can produce new frequency component, produces Intermodulation Interference signal.Wherein, some Intermodulation Interference signals, as third order intermodulation interference signal, intensity is larger, and frequency is just within the scope of the frequency acceptance band in base station, in the time that TMA (Tower Mounted Amplifier, tower amplifier) amplifies and sends base station to as user terminal signal the reception signal of antenna, Intermodulation Interference signal can produce larger interference to received signal, thereby reduces signal receiving quality.And first determine the spectrum signature of the Intermodulation Interference signal of the device such as antenna, just can have for this Intermodulation Interference signal of inhibition, thereby effectively improve the quality of reception signal.
In prior art, the method that usually adopts frequency spectrograph to do spectrum analysis to Intermodulation Interference signal is determined the spectrum signature of Intermodulation Interference signal, need in laboratory, build complicated system and just can carry out.Transmit by signal generator anolog base station, by analog signal transmission paths such as mixer, duplexer and collection targets, finally could signal be gathered and be analyzed by frequency spectrograph.Because can entering frequency spectrograph through multiple instruments, Intermodulation Interference signal demand carries out spectrum analysis, disturb for avoiding introducing, the caused Intermodulation Interference signal of these instruments itself must be enough little, will increase like this instrument cost, and then increase the cost of signals collecting.
Summary of the invention
The embodiment of the present invention provides a kind of tower amplifier, antenna, to facilitate the collection of signal, reduces acquisition cost.
For achieving the above object, the embodiment of the present invention adopts following technical scheme:
A kind of tower amplifier, comprises transmitting filter circuit and wave reception filtering circuit, also comprises signal acquisition circuit, and described signal acquisition circuit is connected with described wave reception filtering circuit, for gathering signal in the frequency acceptance band of described wave reception filtering circuit.
Concrete, described signal acquisition circuit comprises: down-converter unit, for signal in the frequency acceptance band of described wave reception filtering circuit output is down-converted to intermediate-freuqncy signal; AD conversion unit, is connected with described down-converter unit, for the intermediate-freuqncy signal of described down-converter unit output is carried out to analog-to-digital conversion output.
Concrete, described wave reception filtering circuit comprises low noise amplifier; Described down-converter unit comprises frequency mixer, and described AD conversion unit comprises analog to digital converter; Wherein, the input of described frequency mixer is connected with the output of described low noise amplifier, for signal in the frequency acceptance band of described low noise amplifier output is down-converted to intermediate-freuqncy signal; The input of described analog to digital converter is connected with the output of described frequency mixer, for the intermediate-freuqncy signal of described frequency mixer output is carried out to analog-to-digital conversion output.
Optionally, described wave reception filtering circuit comprises low noise amplifier; Described down-converter unit comprises the first amplifier, the first filter, frequency mixer and the second filter, and described AD conversion unit comprises analog to digital converter; Wherein, the input of described the first amplifier is connected with the output of described low noise amplifier, for amplifying signal in the frequency acceptance band of described wave reception filtering circuit output; The input of described the first filter is connected with the output of described the first amplifier, for receiving signal in the frequency acceptance band of described the first amplifier output, and the interference signal that the first amplifier produces described in filtering; The input of described frequency mixer is connected with the output of described the first filter, for signal in the frequency acceptance band by described the first filter is down-converted to intermediate-freuqncy signal; The input of described the second filter is connected with the output of described frequency mixer, for receiving the intermediate-freuqncy signal of described frequency mixer output, and the interference signal that frequency mixer produces described in filtering; The input of described analog to digital converter is connected with the output of described the second filter, for the intermediate-freuqncy signal of described the second filter output is carried out to analog-to-digital conversion output.
Further, described signal acquisition circuit also comprises frequency mixer control unit, and the output of described frequency mixer control unit is connected in described frequency mixer, outputs to the frequency range of the intermediate-freuqncy signal of described the second filter for controlling described frequency mixer.
Further, described signal acquisition circuit also comprises conversion modulating unit, and the input of described conversion modulating unit is connected with the output of described analog to digital converter, for the digital signal of described digital to analog converter output is modulated and exported.
Further, described signal acquisition circuit also comprises Spectrum Conversion unit, and the input of described spectral conversion unit is connected with the output of described analog to digital converter, for the digital signal of described analog to digital converter output is carried out to Spectrum Conversion output.
Concrete, described Spectrum Conversion unit comprises digital down converter and Spectrum Conversion element; The input of described digital down converter is connected with the output of described analog to digital converter, is baseband signal for the digital signal Digital Down Convert that described analog to digital converter is exported; The input of described Spectrum Conversion element is connected with the output of described digital down converter, for the baseband signal of described digital down converter output is carried out to Spectrum Conversion to export the frequency spectrum of signal in described frequency acceptance band.
Optionally, described Spectrum Conversion unit also comprises narrow band filter, the input of described narrow band filter is connected with the output of described analog to digital converter, output is connected with the input of described digital down converter, for the digital signal of described analog to digital converter output is carried out to frequency-division filter, and export to described digital down converter.
Further, described signal acquisition circuit also comprises spectrum modulation unit, and the input of described spectrum modulation unit is connected with the output of described Spectrum Conversion element, for the frequency spectrum of signal in the frequency acceptance band of described Spectrum Conversion element output is modulated.
Further, described signal acquisition circuit also comprises control unit, and described control unit is provided with the first output and the second output; Wherein, described the first output is connected in described frequency mixer, outputs to the frequency range of the intermediate-freuqncy signal of described the second filter for controlling described frequency mixer; Described the second output is connected in described digital down converter, outputs to the frequency range of the baseband signal of described Spectrum Conversion element for controlling described digital down converter.
Optionally, described Spectrum Conversion unit is digital signal processing chip or field programmable gate array chip or the dedicated IC chip that is integrated with described digital down converter and Spectrum Conversion element.
A kind of antenna, comprises the tower amplifier that the above embodiment of the present invention provides.
Tower amplifier, antenna that the embodiment of the present invention provides, gather including signal in the frequency acceptance band of Intermodulation Interference signal in wave reception filtering circuit by signal acquisition circuit, because tower amplifier is the necessaries of base station while normally working, facilitate the collection of signal, without the operational environment of introducing Other Instruments or simulate this collection target in laboratory, reduce cost; Further, avoided the Intermodulation Interference that in gatherer process, Other Instruments produces impact.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
A kind of electrical block diagram of the tower amplifier that Fig. 1 provides for the embodiment of the present invention;
The another kind of electrical block diagram of the tower amplifier that Fig. 2 provides for the embodiment of the present invention;
The another kind of electrical block diagram of the tower amplifier that Fig. 3 provides for the embodiment of the present invention;
The another kind of electrical block diagram of the tower amplifier that Fig. 4 provides for the embodiment of the present invention;
The another kind of electrical block diagram of the tower amplifier that Fig. 5 provides for the embodiment of the present invention;
The another kind of electrical block diagram of the tower amplifier that Fig. 6 provides for the embodiment of the present invention;
The another kind of electrical block diagram of the tower amplifier that Fig. 7 provides for the embodiment of the present invention;
The another kind of electrical block diagram of the tower amplifier that Fig. 8 provides for the embodiment of the present invention;
The another kind of electrical block diagram of the tower amplifier that Fig. 9 provides for the embodiment of the present invention;
The another kind of electrical block diagram of the tower amplifier that Figure 10 provides for the embodiment of the present invention;
The another kind of electrical block diagram of the tower amplifier that Figure 11 provides for the embodiment of the present invention;
The one application schematic diagram of the tower amplifier that Figure 12 provides for the embodiment of the present invention;
The another kind application schematic diagram of the tower amplifier that Figure 13 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
For simplicity, use in the following description TMA (Tower Mounted Amplifier) to refer to tower amplifier.
Figure 1 shows that a specific embodiment of TMA provided by the invention, as shown in Figure 1, the TMA that the present embodiment provides comprises transmitting filter circuit 11, wave reception filtering circuit 12, also comprise signal acquisition circuit 13, signal acquisition circuit 13 is connected with wave reception filtering circuit 12, for gathering signal in the frequency acceptance band of wave reception filtering circuit 12.
Concrete, the input 1101 of transmitting filter circuit 11 is connecting base station side port BTS (the Base Transceiver Station of TMA, base transceiver station) port 20, output 1102 is connecting antenna side port ANT (Antenna, antenna) port 30, the input 1201 of wave reception filtering circuit 12 is connecting antenna side port ANT port 30, and output 1202 is connecting base station side port BTS port 20.Signal acquisition circuit 13 is connected with wave reception filtering circuit 12, for gathering signal in the frequency acceptance band of wave reception filtering circuit 12.
It should be noted that, in the embodiment of the present invention, based on foregoing circuit annexation, in the time that TMA coordinates base station to communicate the transmitting-receiving work of signal, in the frequency acceptance band of wave reception filtering circuit 12, signal had both comprised the reception signal of base station, as transmitting of user terminal, also comprised Intermodulation Interference signal.These two kinds of signals can both be gathered by signal acquisition circuit 13.
Concrete, in the time that TMA normally works, transmitting of base station enters TMA by BTS port 20, is sent to antenna, and goes out by this antenna transmission after 11 filtering of transmitting filter circuit by ANT port 30; Due to transmit the process from base station to antenna transmission device or the circuit of process there is certain non-linear Intermodulation Interference that produces, wherein the Intermodulation Interference of antenna position is particularly evident.And part Intermodulation Interference signal is by antenna-reflected, thereby enter TMA together with receiving signal, be sent to base station by wave reception filtering circuit 12.Receive signal and Intermodulation Interference signal by wave reception filtering circuit 12 in the process of base-station transmission, signal acquisition circuit 13 by with being connected of wave reception filtering circuit 12, gather and receive signal and Intermodulation Interference signals from wave reception filtering circuit 12.
TMA provided by the invention, gathers including signal in the frequency acceptance band of Intermodulation Interference signal in wave reception filtering circuit 12 by signal acquisition circuit 13.Because TMA is the necessaries of base station while normally working, facilitate the collection of signal, without the operational environment of introducing Other Instruments or simulate this collection target in laboratory, reduce cost; Further, avoided the Intermodulation Interference that in gatherer process, Other Instruments produces impact.
As shown in Figure 1, transmitting filter circuit 11 can be emission filter, can allow the signal in emission band to pass through, and stops emission band signal in addition to pass through simultaneously.Wave reception filtering circuit 12 can comprise the first receiving filter 121, low noise amplifier 122 and second receiving filter 123 of series connection successively; Wherein, the first receiving filter 121 and the second receiving filter 123 can allow the signal in frequency acceptance band to pass through, and stop frequency acceptance band signal in addition to pass through simultaneously; Low noise amplifier 122 can amplify the fainter signal of exporting from the first receiving filter 121, and sends the second receiving filter 123 to.In addition, the output 12202 of low noise amplifier 122 is also connected with signal acquisition circuit 13, so that signal acquisition circuit 13 settling signal collections.
Wherein, signal acquisition circuit 13 comprises down-converter unit 131 and ADC (Analog to Digital Converter, analog to digital converter) unit 132.Wherein, down-converter unit 131 is connected with the output 12202 of low noise amplifier 122, for signal in the frequency acceptance band of wave reception filtering circuit output is down-converted to intermediate-freuqncy signal.And ADC unit 132 is connected with down-converter unit 131, carry out analog-to-digital conversion output for the intermediate-freuqncy signal that down-converter unit 131 is exported.
Like this, in original frequency acceptance band, signal is collected and is converted into digital signal and output to outside TMA by signal acquisition circuit.Although analog to digital conversion circuit output is the digital signal of intermediate-freuqncy signal, owing to including the energy information of the signal of each frequency component in frequency acceptance band in this digital signal, therefore can be utilized as spectrum analyzer circuit by some digital signal processing circuits.For example, in one embodiment of the invention, can spread out of signal in the frequency acceptance band of TMA to this by the processor outside TMA and do further processing, such as Spectrum Conversion etc., the accurate and easy spectrum signature that obtains signal in frequency acceptance band.Because same base station adopts several fixing tranmitting frequencies and receive frequency, therefore, in the interior signal of frequency acceptance band that the TMA that the embodiment of the present invention provides collects, remove outside known described several fixing tranmitting frequency and receive frequency, the spectrum energy also existing in other frequency range, is the frequency range at Intermodulation Interference place and the Intermodulation Interference intensity of correspondence thereof.
It should be noted that, although the present invention determines that the spectrum signature of Intermodulation Interference signal is that example describes, the invention is not restricted to this, frequency other interference within the scope of frequency acceptance band also can be determined with this.
Because signal in the frequency acceptance band at wave reception filtering circuit 12 places is analog signal, antijamming capability compares digital difference signal, in this case, more early signal in this frequency acceptance band is gathered and digitlization, more can reduce other and disturb the impact on signal in this frequency acceptance band.Therefore, the TMA that the embodiment of the present invention provides, by down-converter unit 131 and ADC unit 132, signal in frequency acceptance band is gathered and digitlization in TMA, shorten the transmission path of the analog signals such as the interior signal of frequency acceptance band, reduce the impact of other interference signal on signal in this frequency acceptance band, thereby improved the collection accuracy to signal in frequency acceptance band.
In the present embodiment, down-converter unit 131 and ADC unit 132 can be both integrated chips, also can be some circuit structure and supplementary structures thereof with frequency down-conversion function and analog-digital conversion function, can also be the combination of chip and circuit structure, and the present invention does not limit this.
Concrete, as shown in Figure 1, in one embodiment of the invention, down-converter unit 131 can be frequency mixer 1311, ADC unit 132 can be ADC1321; Wherein, the input 13111 of frequency mixer 1311 is connected with the output 12202 of low noise amplifier 122, down-converts to intermediate-freuqncy signal for signal in the frequency acceptance band that low noise amplifier 122 is exported; The input 13211 of ADC1321 is connected with the output 13112 of frequency mixer 1311, carries out analog-to-digital conversion output for the intermediate-freuqncy signal that described frequency mixer 1311 is exported.
Preferably, in order to improve the acquisition quality of signal in frequency acceptance band, down-converter unit 131 can also comprise amplifier and filter etc., and other contributes to improve the device of signal quality.
For example, in another embodiment of the present invention, the down-converter unit 131 in embodiment illustrated in fig. 1 can also be replaced by down-converter unit 131 as shown in Figure 2.As shown in Figure 2, down-converter unit 131 can specifically comprise: the first amplifier 1312, the first filter 1313 are if image frequency filter, frequency mixer 1314 and the second filter 1315 are as frequency overlapped-resistable filter; ADC unit 132 comprises ADC1321.
Wherein, the input 13121 of the first amplifier 1312 is connected with the output 12202 of low noise amplifier, for amplifying signal in the frequency acceptance band of described wave reception filtering circuit output; The input 13131 of the first filter 1313 is connected with the output 13122 of the first amplifier 1312, and for receiving signal in the frequency acceptance band that the first amplifier 1312 exports, the interference signal that filtering the first amplifier 1312 produces, as image interference; The input 13141 of frequency mixer 1314 is connected with the output 13132 of the first filter 1313, for signal in the frequency acceptance band by the first filter 1313 is down-converted to intermediate-freuqncy signal; The input 13151 of the second filter 1315 is connected with the output 13142 of frequency mixer 1314, the intermediate-freuqncy signal of exporting for receiving mixer 1314, the interference signal that filtering frequency mixer 1314 produces; The input 13211 of ADC1321 is connected with the output 13152 of the second filter 1315, carries out analog-to-digital conversion output for the intermediate-freuqncy signal that the second filter 1315 is exported.Like this, in frequency acceptance band, signal can keep higher quality after down-converter unit 131 down-conversions, and then makes the interior signal of frequency acceptance band after ADC unit 132 analog-to-digital conversion more accurate.
It should be noted that, frequency mixer is conventionally merely able to signal up-conversion in the reception signal in one section of fixed frequency band and frequency acceptance band or down-converts to the intermediate-freuqncy signal within the scope of certain frequency, but the frequency bandwidth of this fixed frequency band is often less compared with frequency acceptance band, in order to make frequency mixer 1314 adapt to the bandwidth of frequency acceptance band, thereby signal in frequency acceptance band is carried out to down-conversion, preferably, as shown in Figure 3, in another embodiment of the present invention, TMA also comprises frequency mixer control unit 1363, frequency mixer 1314 is also provided with control end 13143, the output 13632 of frequency mixer control unit 1363 is connected with the control end 13143 of frequency mixer 1314, output to the frequency range of the intermediate-freuqncy signal of the second filter 1315 for controlling frequency mixer 1314, thereby make frequency mixer 1314 signal in whole frequency acceptance band can be down-converted to intermediate-freuqncy signal.
As described above, intermediate-freuqncy signal is converted to after digital signal through ADC unit 132, can send out TMA by the interface of TMA.At this moment, optional, may there are two kinds of situations: if described digital signal is compatible mutually with this interface, this digital signal just can directly be sent out by described interface.Otherwise, need first this digital signal to be converted to and the described interface signal of compatibility mutually, could send by this interface.
For example, in one embodiment of the invention, the interface that carries out digital communication with the external world in TMA is AISG (Antenna Interface Standards Group, antennal interface standard group) interface, and the digital signal level that its interface level and ADC 1321 export is incompatible.; as shown in Figure 4; in the present embodiment; TMA also comprises conversion modulating unit 1351; the conversion input 13511 of modulating unit 1351 and the output 13212 of ADC1321 are connected; for the digital signal of ADC1321 output is modulated, the signal after modulation is compatible mutually with AISG interface, just can transfer out TMA by this interface.
It should be noted that, except conversion modulating unit 1351, all features in previous embodiment are all applicable to the present embodiment, have been described in detail above, repeat no more herein.
In previous embodiment, TMA just sends out TMA by the digital signal of ADC1321 output without further Digital Signal Processing, although frequency and the energy information corresponding with this frequency that this digital signal has comprised signal in frequency acceptance band, also need equipment beyond TMA this digital signal to be done further data processing and could be obtained the spectrum information of signal in frequency acceptance band.
Further, in other embodiments of the invention, also the circuit structure of above-mentioned data processing can be arranged in TMA.For example, the TMA increasing behind Spectrum Conversion unit in the TMA shown in Fig. 2 can be as shown in Figure 5.In Fig. 5, the signal acquisition circuit of TMA also comprises Spectrum Conversion unit 133, and the input of spectral conversion unit 133 is connected with the output of ADC1321 13212, for the digital signal of ADC1321 output is carried out to Spectrum Conversion output.It should be noted that, in the present embodiment, except Spectrum Conversion unit 133, all features of previous embodiment are all applicable to the present embodiment.
Concrete, Spectrum Conversion unit 133 can comprise DDC (Digital Down Converter, digital down converter) 1332 and Spectrum Conversion element 1333.
Wherein, Spectrum Conversion element 1333 can be element, circuit structure or the chip that FFT (Fast Fourier Transform, fast Fourier transform) element or other have Spectrum Conversion function, and the present invention is not construed as limiting this.
Concrete, as shown in Figure 5, in one embodiment of the invention, the input 13321 of DDC1332 is connected with the output 13212 of ADC1321, is baseband signal for the digital signal Digital Down Convert that ADC1321 is exported; The input 13331 of Spectrum Conversion element 1333 is connected with the output 13322 of digital down converter 1332, for the baseband signal after DDC1332 Digital Down Convert being carried out to Spectrum Conversion to export the frequency spectrum of signal in described frequency acceptance band.Because the receive frequency of base station is known, within the scope of frequency acceptance band, the signal in the frequency beyond receive frequency can be defined as Intermodulation Interference signal like this.
Be provided with behind Spectrum Conversion unit 133, TMA provided by the invention not only can collect signal in frequency acceptance band, signal in this frequency acceptance band is converted to the digital signal of being convenient to transmission, and can also carry out Digital Signal Processing to this digital signal, thereby obtain corresponding spectrum information, because the receive frequency of base station is known, so just can be according to known receive frequency, determine within the scope of frequency acceptance band, signal beyond receive frequency is Intermodulation Interference signal, and the spectral characteristic that comprises signal in the frequency acceptance band of Intermodulation Interference signal is showed intuitively by chart etc.
It should be noted that, the frequency spectrum of signal in the frequency acceptance band that Spectrum Conversion unit 133 is exported, refer to and can reflect the energy of signal in each frequency range or the information of power distribution situation in this frequency acceptance band, both can be the interior energy of signal of frequency acceptance band or the size of power corresponding on each frequency, also can be the energy of certain frequency range or the integration of power, concrete form not be limit.
Concrete, Spectrum Conversion unit 133 can be for being integrated with DSP (the Digital Signal Processor of DDC 1332 and Spectrum Conversion element 1333, digital signal processor) chip or FPGA (Field-Programmable Gate Array, field programmable gate array) chip or ASIC (Application Specific Integrated Circuit, application-specific integrated circuit (ASIC)) chip, also can be for otherwise realizing the circuit structure of Spectrum Conversion function, the present invention does not limit this.
Be illustrated in figure 6 the TMA of an alternative embodiment of the invention, different from the embodiment shown in Fig. 5, in the present embodiment, Spectrum Conversion unit 133 also can comprise narrow band filter 1331.The input 13311 of narrow band filter 1331 is connected with the output 13212 of ADC1321, and output 13312 is connected with the input 13321 of DDC1332, for the digital signal of ADC1321 output is carried out to frequency-division filter, and exports to DDC1332.For example, the digital signal of ADC1321 output can be divided into the frequency range that multistage is identical with the filtering bandwidth of narrow band filter 1331 and carry out respectively filtering, and export to DDC1332, thereby further improve the quality of signal in frequency acceptance band.The input 13321 of DDC1332 is connected with the output 13312 of narrow band filter 1331, for being baseband signal by filtered narrow band filter 1331 digital signal Digital Down Convert.
It should be noted that, the working band of narrow band filter 1331 is generally less than the frequency band of the digital signal of ADC1321 output, in order to make narrow band filter 1331 carry out filtering to the digital signal of all ADC1321 outputs, preferred, narrow band filter 1331 can be bandwidth varying narrow band filter.Although this bandwidth varying narrow band filter bandwidth at a time does not cover the four corner of frequency acceptance band, but the passband of bandwidth varying narrow band filter can translation, for example at a time, its passband is 890MHz to 900MHz, next moment, its passband can be 900MHz to 1000MHz, like this, just can realize the covering to target complete frequency band by the translation of passband, and avoid using multiple narrow band filters, thereby further facilitate the collection of signal, reduce acquisition cost.
The TMA increasing in the TMA shown in Fig. 3 behind Spectrum Conversion unit can be as shown in Figure 7.It should be noted that, except Spectrum Conversion unit 133, all features embodiment illustrated in fig. 3 are all applicable to the embodiment shown in Fig. 7, repeat no more herein.
For signal acquisition circuit 13 is more effectively worked, preferred, in another embodiment of the present invention, signal acquisition circuit 13 can also comprise control unit 1362.For example, for the TMA shown in Fig. 6 increases control unit 1362, the TMA increasing after control unit 1362 can be as shown in Figure 8.Except control unit 1362, all features in embodiment illustrated in fig. 6 are all applicable to the embodiment shown in Fig. 8.
Concrete, as shown in Figure 8, control unit 1362 is provided with the first output 13621 and the second output 13622.Wherein, the first output 13621 is connected in the control end 13143 of frequency mixer 1314, outputs to the frequency range of the intermediate-freuqncy signal of the second filter 1315 for controlling frequency mixer 1314; The second output 13622 is connected in the control end 13323 of DDC1332, output to the frequency range of the baseband signal of Spectrum Conversion element 1333 for controlling DDC1332, so that the frequency range of the intermediate-freuqncy signal that the frequency range of the baseband signal of DDC1332 output is exported to frequency mixer 1314 is relevant, thereby make signal after frequency mixer 1314 and DDC1332 consistent with the frequency range of signal in frequency acceptance band in wave reception filtering circuit.
Optionally, control unit 1362 can be for having chip or the circuit structure of controlling function, and the present invention is not construed as limiting this.
Further, Spectrum Conversion unit 133 carries out after Spectrum Conversion digital signal, can be also the frequency spectrum of signal in frequency acceptance band by transformation results by the interface of TMA, sends out TMA.Same, if frequency spectrum and this interface compatibility of the interior signal of described frequency acceptance band can directly be sent out by described interface.Otherwise, needing the first signal with described interface compatibility by the spectral conversion one-tenth of signal in this frequency acceptance band, could send by this interface.
For example, if TMA is AISG interface with the extraneous interface that carries out digital communication, in frequency acceptance band after its interface level and Spectrum Conversion, signal level is incompatible, therefore, can also be that the TMA shown in Fig. 6 to Fig. 8 increases spectrum modulation unit, the TMA increasing behind spectrum modulation unit can be as shown in Figures 9 to 11.Wherein, the input 13521 of spectrum modulation unit 1352 is connected with the output 13332 of Spectrum Conversion element 1333, frequency spectrum for signal in the frequency acceptance band that Spectrum Conversion element 1333 is exported is modulated, thus with convert to AISG interface mutually compatible signal transfer out TMA by AISG interface.
It should be noted that, the TMA that the present embodiment provides, except frequency spectrum modulating unit 1352, all features of the embodiment shown in Fig. 6 to Fig. 8 are applicable to the embodiment shown in Fig. 9 to Figure 11 respectively, have been described in detail above, repeat no more herein.The spectrum modulation unit 1352 relating in above-described embodiment or control unit 1362 or frequency mixer control unit 1363, both can be discrete separately chip, also can be the chip integrating, can also be some other circuit structure, and the present invention does not limit this.
Also it should be noted that, the TMA that the embodiment of the present invention provides comprises signal acquisition circuit, and wherein, the signal acquisition circuit in embodiment is only explanation use, and its concrete form is not limited to described in embodiment.The circuit structure with signal testing function in frequency acceptance band of other form is also within protection scope of the present invention.
In addition, in previous embodiment, TMA is all signals in the working site of the normal work in base station gathers the frequency acceptance band of antenna.That is, as shown in figure 12, reception and the transmission of signal are carried out by BTS port and the TMA1 of TMA1 in base station 2, and TMA1 gathers and receives signal and receive the Intermodulation Interference signal that signal is followed, and sends base station 2 to by AISG port.
Like this, not only effectively complete base station 2 and TMA1 reception and the transmission work to signal, and can under the normal operating conditions of base station 2, TMA1, determine that gathering target is signal in the frequency acceptance band of antenna 3, save the equipment such as duplexer, frequency spectrograph in known technology, not only reduce acquisition cost, avoid the Intermodulation Interference being produced by miscellaneous equipment, and can be applicable to the scene of working in base station 2, signal in the frequency acceptance band of the communication equipments such as Real-Time Monitoring antenna, thereby the convenience and the flexibility that have further improved signals collecting.
In other embodiments of the invention, on the test platform that TMA also can build in laboratory, determine the Intermodulation Interference signal of antenna or other collection target.
For example, Figure 13 shows that TMA provided by the invention is applied in the schematic diagram of the test platform of building.As shown in figure 13, signal source one and signal source two are respectively two signal generators 41 and 42, and the two paths of signals that they produce respectively in emission band, frequency is different is used for the transmitting of anolog base station.This two paths of signals respectively through power amplifier 1 and power amplifier 2 72 be amplified into mixer 5, be sent to the BTS port of TMA1 by mixer 5.TMA1 is also provided with ANT port and AISG port, and wherein the ANT port of TMA1 is connected with collection target 8, and the AISG port of TMA1 is connected with computer 6.
It should be noted that, in the present embodiment, because TMA1 inside is provided with wave reception filtering circuit and sends filter circuit, be equivalent to a duplexer, therefore, on test platform, without increasing again extra duplexer, further reduced the cost of signals collecting.
Also it should be noted that, in the present embodiment, TMA1 is the spectrum signature of determining Intermodulation Interference signal in laboratory on the test platform of building, now gather target 8 and unlike the antenna in working site, base station, receive the signal that user sends, therefore in the signal of TMA1 test, do not comprise the transmitted signal of the user terminal of reception.
TMA1 provided by the invention, not only can in the frequency acceptance band of the real time monitoring collection target of base station work, also determine Intermodulation Interference signal wherein by signal, can also be applied on the test platform of building in laboratory, avoid using the equipment such as the frequency spectrograph in known technology, thereby reduce the cost of signals collecting, avoided the Intermodulation Interference signal being produced by other testing equipment simultaneously.
It should be noted that, in actual application, antenna both transmitted, and received again signal, comparatively responsive to signal in frequency acceptance band, therefore, in previous embodiment, generally determined its Intermodulation Interference signal using antenna as gathering target.But the invention is not restricted to this, all can become the collection target of the TMA that the embodiment of the present invention provides to the object of signal sensitivity in frequency acceptance band.For example, in order to eliminate the impact of Intermodulation Interference signal on certain precision instrument, first will determine the Intermodulation Interference signal to this precision instrument, this precision instrument, just as gathering target, is connected to the ANT port of TMA.The principle of signal testing in the frequency acceptance band of this precision instrument, with identical to the test philosophy of signal in the frequency acceptance band of antenna, is repeated no more herein.
Further, the least interference that TMA provided by the invention can collect can be estimated according to following method.At present, the system noise factor of each base station system can be estimated as 3dB, and antenna opening equivalence back noise is :-174+3=-171dBm/Hz.If require signal to noise ratio to be greater than 6dB, the least interference that TMA provided by the invention can collect is :-171+6=-165dBm/Hz.
It should be noted that, in Intermodulation Interference signal, disturbing the strongest to the reception signal of base station is third order intermodulation interference signal, its centre frequency is 2f1-f2 or 2f2-f1, just drop within the scope of frequency acceptance band, wherein, f1 and f2 are respectively the frequencies of two different reception signals.And the bandwidth of this third order intermodulation interference signal is the twice of carrier bandwidths.Therefore, gather frequency centered by 2f1-f2 or 2f2-f1, the signal taking 2 times of carrier bandwidths as bandwidth, can determine the spectrum signature of third order intermodulation interference signal.Because the bandwidth of the transmitting carrier wave of different standards is not identical.For example, GSM (Global System of Mobile communication, global system for mobile communications) carrier bandwidths is 200KHz, WCDMA (Wideband Code Division Multiple Access, Wideband Code Division Multiple Access (WCDMA)) carrier bandwidths is 5MHz etc., determines the also corresponding difference of bandwidth of the signal frequency that the spectrum signature of Intermodulation Interference signal gathers.
Same, while determining the spectrum signature of Intermodulation Interference signal, signals collecting precision also can be different due to the difference of the maximum carrier bandwidths under different systems.Concrete, can gather the signal of be low to moderate-112dBm for GSM standard TMA, for UMTS (Universal Mobile Telecommunications System, universal mobile telecommunications system) standard, TMA can gather the signal of be low to moderate-99dBm, can gather the signal of be low to moderate-92dBm for LTE (Long Term Evolution, Long Term Evolution) standard TMA.
The embodiment of the present invention also provides a kind of antenna, comprises any TMA in previous embodiment, can realize the useful technique effect that described TMA can reach, and has been described in detail above, repeats no more herein.
One of ordinary skill in the art will appreciate that: all or part of flow process that realizes said method embodiment can complete by the relevant hardware of computer program instructions, aforesaid program can be stored in a computer read/write memory medium, this program, in the time carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (10)
1. a tower amplifier, comprises transmitting filter circuit and wave reception filtering circuit, it is characterized in that, also comprises:
Signal acquisition circuit, described signal acquisition circuit is connected with described wave reception filtering circuit, for gathering signal in the frequency acceptance band of described wave reception filtering circuit;
Described signal acquisition circuit comprises:
Down-converter unit, for down-converting to intermediate-freuqncy signal by signal in the frequency acceptance band of described wave reception filtering circuit output;
AD conversion unit, is connected with described down-converter unit, for the intermediate-freuqncy signal of described down-converter unit output is carried out to analog-to-digital conversion output;
Described wave reception filtering circuit comprises low noise amplifier;
Described down-converter unit comprises frequency mixer, and described AD conversion unit comprises analog to digital converter;
Wherein, the input of described frequency mixer is connected with the output of described low noise amplifier, for signal in the frequency acceptance band of described low noise amplifier output is down-converted to intermediate-freuqncy signal;
The input of described analog to digital converter is connected with the output of described frequency mixer, for the intermediate-freuqncy signal of described frequency mixer output is carried out to analog-to-digital conversion output;
Or
Described wave reception filtering circuit comprises low noise amplifier;
Described down-converter unit comprises the first amplifier, the first filter, frequency mixer and the second filter, and described AD conversion unit comprises analog to digital converter;
Wherein, the input of described the first amplifier is connected with the output of described low noise amplifier, for amplifying signal in the frequency acceptance band of described wave reception filtering circuit output;
The input of described the first filter is connected with the output of described the first amplifier, for receiving signal in the frequency acceptance band of described the first amplifier output, and the interference signal that the first amplifier produces described in filtering;
The input of described frequency mixer is connected with the output of described the first filter, for signal in the frequency acceptance band by described the first filter is down-converted to intermediate-freuqncy signal;
The input of described the second filter is connected with the output of described frequency mixer, for receiving the intermediate-freuqncy signal of described frequency mixer output, and the interference signal that frequency mixer produces described in filtering;
The input of described analog to digital converter is connected with the output of described the second filter, for the intermediate-freuqncy signal of described the second filter output is carried out to analog-to-digital conversion output.
2. tower amplifier according to claim 1, is characterized in that,
Described signal acquisition circuit also comprises frequency mixer control unit, and the output of described frequency mixer control unit is connected in described frequency mixer, outputs to the frequency range of the intermediate-freuqncy signal of described the second filter for controlling described frequency mixer.
3. tower amplifier according to claim 1 and 2, is characterized in that,
Described signal acquisition circuit also comprises conversion modulating unit, and the input of described conversion modulating unit is connected with the output of described analog to digital converter, for the digital signal of described analog to digital converter output is modulated and exported.
4. tower amplifier according to claim 1 and 2, is characterized in that,
Described signal acquisition circuit also comprises Spectrum Conversion unit, and the input of described spectral conversion unit is connected with the output of described analog to digital converter, for the digital signal of described analog to digital converter output is carried out to Spectrum Conversion output.
5. tower amplifier according to claim 4, is characterized in that,
Described Spectrum Conversion unit comprises digital down converter and Spectrum Conversion element;
The input of described digital down converter is connected with the output of described analog to digital converter, is baseband signal for the digital signal Digital Down Convert that described analog to digital converter is exported;
The input of described Spectrum Conversion element is connected with the output of described digital down converter, for the baseband signal of described digital down converter output is carried out to Spectrum Conversion to export the frequency spectrum of signal in described frequency acceptance band.
6. tower amplifier according to claim 5, it is characterized in that, described Spectrum Conversion unit also comprises narrow band filter, the input of described narrow band filter is connected with the output of described analog to digital converter, output is connected with the input of described digital down converter, for the digital signal of described analog to digital converter output is carried out to frequency-division filter, and export to described digital down converter.
7. tower amplifier according to claim 5, is characterized in that,
Described signal acquisition circuit also comprises spectrum modulation unit, and the input of described spectrum modulation unit is connected with the output of described Spectrum Conversion element, for the frequency spectrum of signal in the frequency acceptance band of described Spectrum Conversion element output is modulated.
8. according to the tower amplifier described in any one in claim 5 to 7, it is characterized in that,
Described signal acquisition circuit also comprises control unit, and described control unit is provided with the first output and the second output;
Wherein, described the first output is connected in described frequency mixer, outputs to the frequency range of the intermediate-freuqncy signal of described the second filter for controlling described frequency mixer;
Described the second output is connected in described digital down converter, outputs to the frequency range of the baseband signal of described Spectrum Conversion element for controlling described digital down converter.
9. tower amplifier according to claim 5, is characterized in that, described Spectrum Conversion unit is digital signal processing chip or field programmable gate array chip or the dedicated IC chip that is integrated with described digital down converter and Spectrum Conversion element.
10. an antenna, comprises the tower amplifier described in claim 1-9 any one.
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| CN201110405757.5A CN102594431B (en) | 2011-12-08 | 2011-12-08 | Tower mounted amplifier and antenna |
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| CN201110405757.5A CN102594431B (en) | 2011-12-08 | 2011-12-08 | Tower mounted amplifier and antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3499745A4 (en) * | 2016-08-29 | 2019-08-07 | Huawei Technologies Co., Ltd. | Tower mounted amplifier |
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|---|---|---|---|---|
| CN1917404A (en) * | 2005-08-19 | 2007-02-21 | 重庆信威通信技术有限责任公司 | Detection device and method of amplifier at column top in SCDMA system |
| CN101060307A (en) * | 2007-04-17 | 2007-10-24 | 京信通信系统（中国）有限公司 | A digital variable-frequency system and its signal processing method |
| CN201499134U (en) * | 2009-08-21 | 2010-06-02 | 京信通信系统（中国）有限公司 | Digital predistortion power amplifier |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1917404A (en) * | 2005-08-19 | 2007-02-21 | 重庆信威通信技术有限责任公司 | Detection device and method of amplifier at column top in SCDMA system |
| CN101060307A (en) * | 2007-04-17 | 2007-10-24 | 京信通信系统（中国）有限公司 | A digital variable-frequency system and its signal processing method |
| CN201499134U (en) * | 2009-08-21 | 2010-06-02 | 京信通信系统（中国）有限公司 | Digital predistortion power amplifier |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3499745A4 (en) * | 2016-08-29 | 2019-08-07 | Huawei Technologies Co., Ltd. | Tower mounted amplifier |
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