CN102594431A - Tower mounted amplifier and antenna - Google Patents
Tower mounted amplifier and antenna Download PDFInfo
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- CN102594431A CN102594431A CN2011104057575A CN201110405757A CN102594431A CN 102594431 A CN102594431 A CN 102594431A CN 2011104057575 A CN2011104057575 A CN 2011104057575A CN 201110405757 A CN201110405757 A CN 201110405757A CN 102594431 A CN102594431 A CN 102594431A
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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 carrier signal that the frequency of base station is different was propagated in devices such as antenna, the interaction between a plurality of different frequency components that transmit can produce new frequency component, promptly produces the Intermodulation Interference signal.Wherein, some Intermodulation Interference signals are like the third order intermodulation interference signal; Intensity is bigger; And frequency is in the frequency acceptance band scope of base station just, when TMA (Tower Mounted Amplifier, tower amplifier) amplifies the reception signal of antenna such as user terminal signal and sends the base station to; The Intermodulation Interference signal can produce larger interference to received signal, thereby reduces signal receiving quality.And the spectrum signature of the Intermodulation Interference signal of devices such as earlier definite antenna just can have this Intermodulation Interference signal of inhibition that is directed against, and receives quality of signals thereby effectively improve.
In the prior art, the method that usually adopts frequency spectrograph that the Intermodulation Interference signal is done spectrum analysis is confirmed the spectrum signature of Intermodulation Interference signal, need in the laboratory, build complicated system and just can carry out.Transmit through the signal generator anolog base station,, could gather and analyze signal through frequency spectrograph at last through analog signal transmission paths such as mixer, duplexer and collection targets.Because can getting into frequency spectrograph through a plurality of instruments, the 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 instrument cost like this, and then increase the cost of signals collecting.
Summary of the invention
The embodiment of the invention provides a kind of tower amplifier, antenna, to make things convenient for the collection of signal, reduces acquisition cost.
For achieving the above object, the embodiment of the invention adopts following technical scheme:
A kind of tower amplifier comprises the emission filter circuit and accepts filter circuit that also comprise signal acquisition circuit, said signal acquisition circuit links to each other with the said circuit that accepts filter, and is used to gather the interior signal of frequency acceptance band of the said circuit that accepts filter.
Concrete, said signal acquisition circuit comprises: down-converter unit is used for signal in the frequency acceptance band of the said circuit output that accepts filter is down-converted to intermediate-freuqncy signal; AD conversion unit links to each other with said down-converter unit, is used for the intermediate-freuqncy signal of said down-converter unit output is carried out analog-to-digital conversion and output.
Concrete, the said circuit that accepts filter comprises low noise amplifier; Said down-converter unit comprises frequency mixer, and said AD conversion unit comprises analog to digital converter; Wherein, the input of said frequency mixer links to each other with the output of said low noise amplifier, is used for signal in the frequency acceptance band of said low noise amplifier output is down-converted to intermediate-freuqncy signal; The input of said analog to digital converter links to each other with the output of said frequency mixer, is used for the intermediate-freuqncy signal of said frequency mixer output is carried out analog-to-digital conversion and output.
Optional, the said circuit that accepts filter comprises low noise amplifier; Said down-converter unit comprises first amplifier, first filter, frequency mixer and second filter, and said AD conversion unit comprises analog to digital converter; Wherein, said first amplifier input terminal links to each other with the output of said low noise amplifier, is used to amplify the interior signal of frequency acceptance band of the said circuit output that accepts filter; The input of said first filter links to each other with the output of said first amplifier, is used to receive the interior signal of frequency acceptance band of said first amplifier output, the interference signal that said first amplifier of filtering produces; The input of said frequency mixer links to each other with the output of said first filter, is used for down-converting to intermediate-freuqncy signal through signal in the frequency acceptance band of said first filter; The input of said second filter links to each other with the output of said frequency mixer, is used to receive the intermediate-freuqncy signal of said frequency mixer output, the interference signal that the said frequency mixer of filtering produces; The input of said analog to digital converter links to each other with the output of said second filter, is used for the intermediate-freuqncy signal of said second filter output is carried out analog-to-digital conversion and output.
Further, said signal acquisition circuit also comprises the frequency mixer control unit, and the output of said frequency mixer control unit is connected in said frequency mixer, is used to control the frequency range that said frequency mixer outputs to the intermediate-freuqncy signal of said second filter.
Further, said signal acquisition circuit also comprises the conversion modulating unit, and the input of said conversion modulating unit links to each other with the output of said analog to digital converter, is used for the digital signal of said digital to analog converter output is modulated and exported.
Further, said signal acquisition circuit also comprises the spectrum transformation unit, and the input of said spectral conversion unit links to each other with the output of said analog to digital converter, is used for the digital signal of said analog to digital converter output is carried out spectrum transformation and output.
Concrete, said spectrum transformation unit comprises digital down converter and spectrum transformation element; The input of said digital down converter links to each other with the output of said analog to digital converter, and the digital signal Digital Down Convert that is used for said analog to digital converter output is a baseband signal; The input of said spectrum transformation element links to each other with the output of said digital down converter, is used for the baseband signal of said digital down converter output is carried out spectrum transformation to export the frequency spectrum of signal in the said frequency acceptance band.
Optional; Said spectrum transformation unit also comprises narrow band filter; The input of said narrow band filter links to each other with the output of said analog to digital converter; Output links to each other with the input of said digital down converter, is used for the digital signal of said analog to digital converter output is carried out frequency-division filter, and exports to said digital down converter.
Further, said signal acquisition circuit also comprises the spectrum modulation unit, and the input of said spectrum modulation unit links to each other with the output of said spectrum transformation element, is used for the frequency spectrum of signal in the frequency acceptance band of said spectrum transformation element output is modulated.
Further, said signal acquisition circuit also comprises control unit, and said control unit is provided with first output and second output; Wherein, said first output is connected in said frequency mixer, is used to control the frequency range that said frequency mixer outputs to the intermediate-freuqncy signal of said second filter; Said second output is connected in said digital down converter, is used to control the frequency range that said digital down converter outputs to the baseband signal of said spectrum transformation element.
Optional, said spectrum transformation unit is digital signal processing chip or field programmable gate array chip or the dedicated IC chip that is integrated with said digital down converter and spectrum transformation element.
A kind of antenna comprises the tower amplifier that the above embodiment of the present invention provides.
The tower amplifier that the embodiment of the invention provides, antenna; Through signal acquisition circuit signal in the frequency acceptance band that includes the Intermodulation Interference signal in the reception filter circuit is gathered; Because the necessaries when tower amplifier is the base station operate as normal; Made things convenient for the collection of signal, the operational environment that need not to introduce Other Instruments or in the laboratory, simulate this collection target has reduced cost; Further, avoided the Intermodulation Interference that Other Instruments produces in gatherer process influence.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
A kind of electrical block diagram of the tower amplifier that Fig. 1 provides for the embodiment of the invention;
The another kind of electrical block diagram of the tower amplifier that Fig. 2 provides for the embodiment of the invention;
The another kind of electrical block diagram of the tower amplifier that Fig. 3 provides for the embodiment of the invention;
The another kind of electrical block diagram of the tower amplifier that Fig. 4 provides for the embodiment of the invention;
The another kind of electrical block diagram of the tower amplifier that Fig. 5 provides for the embodiment of the invention;
The another kind of electrical block diagram of the tower amplifier that Fig. 6 provides for the embodiment of the invention;
The another kind of electrical block diagram of the tower amplifier that Fig. 7 provides for the embodiment of the invention;
The another kind of electrical block diagram of the tower amplifier that Fig. 8 provides for the embodiment of the invention;
The another kind of electrical block diagram of the tower amplifier that Fig. 9 provides for the embodiment of the invention;
The another kind of electrical block diagram of the tower amplifier that Figure 10 provides for the embodiment of the invention;
The another kind of electrical block diagram of the tower amplifier that Figure 11 provides for the embodiment of the invention;
A kind of application sketch map of the tower amplifier that Figure 12 provides for the embodiment of the invention;
Figure 13 uses sketch map for the another kind of the tower amplifier that the embodiment of the invention provides.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
For for simplicity, use TMA (Tower Mounted Amplifier) to refer to tower amplifier in the following description.
Shown in Figure 1 is the specific embodiment of TMA provided by the invention; As shown in Figure 1; The TMA that present embodiment provides comprises emission filter circuit 11, circuit 12 accepts filter; Also comprise signal acquisition circuit 13, signal acquisition circuit 13 links to each other with the circuit 12 that accepts filter, and is used to gather the signal in the frequency acceptance band of circuit 12 that accepts filter.
Concrete; The input 1101 of emission filter circuit 11 is connecting base station side port BTS (the Base Transceiver Station of TMA; Base transceiver station) port 20, and output 1102 is connecting antenna side port ANT (Antenna, antenna) port 30; The input 1201 of circuit 12 of accepting filter is connecting antenna side port ANT port 30, and output 1202 is connecting base station side port BTS port 20.Signal acquisition circuit 13 links to each other with the circuit 12 that accepts filter, and is used to gather the signal in the frequency acceptance band of circuit 12 that accepts filter.
Need to prove, in the embodiment of the invention, based on the foregoing circuit annexation; When TMA cooperates the base station to communicate the transmitting-receiving work of signal; The signal in the frequency acceptance band of circuit 12 of accepting filter had both comprised the reception signal of base station, like transmitting of user terminal, also comprised the Intermodulation Interference signal.These two kinds of signals can both be gathered by signal acquisition circuit 13.
Concrete, when the TMA operate as normal, transmitting of base station gets into TMA through BTS port 20, after launching filter circuit 11 filtering, is sent to antenna by ANT port 30, and launches through this antenna; Owing to transmit from the base station to the process of antenna transmission the device or the circuit of process have 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 gets into TMA with receiving signal, and circuit 12 is sent to the base station through accepting filter.Receiving signal and Intermodulation Interference signal by accepting filter circuit 12 in the process of base station transmits, signal acquisition circuit 13 through with being connected of the circuit 12 that accepts filter, circuit 12 is gathered reception signal and Intermodulation Interference signals from accepting filter.
TMA provided by the invention gathers through signal in the frequency acceptance band that includes the Intermodulation Interference signal in 13 pairs of reception filter circuits 12 of signal acquisition circuit.Because the necessaries when TMA is the base station operate as normal has made things convenient for the collection of signal, the operational environment that need not to introduce Other Instruments or in the laboratory, simulate this collection target has reduced cost; Further, avoided the Intermodulation Interference that Other Instruments produces in gatherer process influence.
As shown in Figure 1, emission filter circuit 11 can be emission filter, can allow the signal in the emission band to pass through, and stops the signal beyond the emission band to pass through simultaneously.The circuit 12 that accepts filter can comprise successively first receiving filter 121, low noise amplifier 122 and second receiving filter 123 of series connection; Wherein, first receiving filter 121 and second receiving filter 123 can allow the signal in the frequency acceptance band to pass through, and stop the signal beyond the frequency acceptance band to pass through simultaneously; Low noise amplifier 122 can amplify the fainter signal from 121 outputs of first receiving filter, and sends second receiving filter 123 to.In addition, the output 12202 of low noise amplifier 122 also links to each other with signal acquisition circuit 13, so that signal acquisition circuit 13 is accomplished signals collecting.
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 links to each other with the output 12202 of low noise amplifier 122, is used for signal in the frequency acceptance band of the circuit output that accepts filter is down-converted to intermediate-freuqncy signal.And ADC unit 132 links to each other with down-converter unit 131, is used for the intermediate-freuqncy signal of down-converter unit 131 outputs is carried out analog-to-digital conversion and output.
Like this, the interior signal of original frequency acceptance band is promptly collected and is converted into digital signal and outputs to outside the TMA by signal acquisition circuit.Though analog to digital conversion circuit output is the digital signal of intermediate-freuqncy signal, owing to include the energy information of the signal of each frequency component in the frequency acceptance band in this digital signal, therefore can be by some digital signal processing circuits such as spectrum analyzer circuit utilization.For example, in one embodiment of the invention, can spread out of in the frequency acceptance band of TMA signal to this through the outer processor of TMA and do further processing, for example spectrum transformation etc., the accurate and easy spectrum signature that obtains signal in the frequency acceptance band.Because several fixing tranmitting frequencies and receive frequency are adopted in same base station; Therefore; In the interior signal of the frequency acceptance band that the TMA that the embodiment of the invention provides collects; Remove outside the known said several fixing tranmitting frequency and receive frequency, the spectrum energy that on other frequency range, also exists is the frequency range at Intermodulation Interference place and the Intermodulation Interference intensity of correspondence thereof.
Need to prove, though the present invention is to be that example describes with the spectrum signature of confirming the Intermodulation Interference signal, the invention is not restricted to this, frequency other in the frequency acceptance band scope disturbs also and can confirm with this.
Signal is an analog signal in the frequency acceptance band at circuit 12 places owing to accept filter; Antijamming capability compares digital difference signal; In this case, more early signal in this frequency acceptance band is gathered and digitlization, can be reduced other more and disturb influence signal in this frequency acceptance band.Therefore; The TMA that the embodiment of the invention provides; Through down-converter unit 131 and ADC unit 132 signal in the frequency acceptance band is gathered in TMA and digitlization; Shortened the transmission path of analog signals such as the interior signal of frequency acceptance band, reduced of the influence of other interference signal, thereby improved collection accuracy signal in the frequency acceptance band to signal in this frequency acceptance band.
In the present embodiment; Down-converter unit 131 both can be integrated chip with ADC unit 132; 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 links to each other with the output 12202 of low noise amplifier 122, is used for signal in the frequency acceptance band of low noise amplifier 122 outputs is down-converted to intermediate-freuqncy signal; The input 13211 of ADC1321 links to each other with the output 13112 of frequency mixer 1311, is used for the intermediate-freuqncy signal of said frequency mixer 1311 outputs is carried out analog-to-digital conversion and output.
Preferably, in order to improve the acquisition quality of signal in the frequency acceptance band, down-converter unit 131 can also comprise amplifier and filter etc., and other helps 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 as shown in Figure 2 131.As shown in Figure 2, down-converter unit 131 can specifically comprise: first amplifier 1312, first filter 1313 like image frequency filter, frequency mixer 1314 and second filter 1315 like frequency overlapped-resistable filter; ADC unit 132 comprises ADC1321.
Wherein, the input 13121 of first amplifier 1312 links to each other with the output 12202 of low noise amplifier, is used to amplify the interior signal of frequency acceptance band of the said circuit output that accepts filter; The input 13131 of first filter 1313 links to each other with the output 13122 of first amplifier 1312, is used to receive the interior signal of frequency acceptance band of first amplifier, 1312 outputs, and the interference signal that filtering first amplifier 1312 produces is disturbed like image frequency; The input 13141 of frequency mixer 1314 links to each other with the output 13132 of first filter 1313, is used for down-converting to intermediate-freuqncy signal through signal in the frequency acceptance band of first filter 1313; The input 13151 of second filter 1315 links to each other with the output 13142 of frequency mixer 1314, is used for the intermediate-freuqncy signal of receiving mixer 1314 outputs, the interference signal that filtering frequency mixer 1314 produces; The input 13211 of ADC1321 links to each other with the output 13152 of second filter 1315, is used for the intermediate-freuqncy signal of second filter, 1315 outputs is carried out analog-to-digital conversion and output.Like this, signal can keep higher quality later through down-converter unit 131 down-conversions in the frequency acceptance band, and then makes the interior signal of frequency acceptance band after ADC unit 132 analog-to-digital conversion more accurate.
Need to prove that frequency mixer is merely able to signal up-conversion in reception signal in one section fixed frequency band and the frequency acceptance band usually or down-converts to the intermediate-freuqncy signal in the certain frequency scope, but that the frequency bandwidth of this fixed frequency band is compared with frequency acceptance band is often less; In order to make frequency mixer 1314 adapt to the bandwidth of frequency acceptance band; Thereby signal in the frequency acceptance band is carried out down-conversion, preferred, as shown in Figure 3; In another embodiment of the present invention; TMA also comprises frequency mixer control unit 1363, and frequency mixer 1314 also is provided with control end 13143, and the output 13632 of frequency mixer control unit 1363 links to each other with the control end 13143 of frequency mixer 1314; Be used to control the frequency range that frequency mixer 1314 outputs to the intermediate-freuqncy signal of second filter 1315, thereby make frequency mixer 1314 down-convert to intermediate-freuqncy signal to signal in the whole frequency acceptance band.
As indicated above, intermediate-freuqncy signal can be sent out TMA through the interface of TMA after converting digital signal into through ADC unit 132.At this moment, optional, two kinds of situation possibly occur: if said digital signal is compatible mutually with this interface, then this digital signal just can directly be sent out by said interface.Otherwise, need to convert this digital signal to the signal compatible mutually earlier with said interface, could pass through this interface and send.
For example; In one embodiment of the invention; The interface that carries out digital communication with the external world among the TMA is AISG (Antenna Interface Standards Group, an antennal interface standard group) interface, and the digital signal level of its interface level and ADC 1321 outputs is incompatible.Then; As shown in Figure 4, in the present embodiment, TMA also comprises conversion modulating unit 1351; The input 13511 of conversion modulating unit 1351 links to each other with the output 13212 of ADC1321; Be used for the digital signal of ADC1321 output is modulated, the signal after the modulation is compatible mutually with the AISG interface, just can transfer out TMA through this interface.
Need to prove that except that conversion modulating unit 1351, all characteristics in the previous embodiment all are applicable to present embodiment, preamble specifies, and repeats no more here.
In the previous embodiment; TMA just sends out TMA with the digital signal that ADC1321 exports without further Digital Signal Processing; Though this digital signal comprised signal in the frequency acceptance band frequency and with this frequency corresponding energy information, also need the equipment beyond the TMA that this digital signal is done the spectrum information that further data processing could obtain signal in the frequency acceptance band.
Further, in other embodiments of the invention, also can the circuit structure of above-mentioned data processing be arranged among the TMA.For example, the TMA behind the increase spectrum transformation unit can be as shown in Figure 5 in TMA shown in Figure 2.In Fig. 5, the signal acquisition circuit of TMA also comprises spectrum transformation unit 133, and the input of spectral conversion unit 133 links to each other with the output of ADC1321 13212, is used for the digital signal of ADC1321 output is carried out spectrum transformation and output.Need to prove that in the present embodiment, except spectrum transformation unit 133, all characteristics of previous embodiment all are applicable to present embodiment.
Concrete, spectrum transformation unit 133 can comprise DDC (Digital Down Converter, digital down converter) 1332 and spectrum transformation element 1333.
Wherein, spectrum transformation element 1333 can have element, circuit structure or the chip of spectrum transformation function for FFT (Fast Fourier Transform, fast Fourier transform) element or other, and the present invention does not limit this.
Concrete, as shown in Figure 5, in one embodiment of the invention, the input 13321 of DDC1332 links to each other with the output 13212 of ADC1321, and the digital signal Digital Down Convert that is used for ADC1321 output is a baseband signal; The input 13331 of spectrum transformation element 1333 links to each other with the output 13322 of digital down converter 1332, is used for the baseband signal after the DDC1332 Digital Down Convert is carried out spectrum transformation to export the frequency spectrum of signal in the said frequency acceptance band.Because the receive frequency of base station is known, in the frequency acceptance band scope, the signal on the frequency beyond the receive frequency can be confirmed as the Intermodulation Interference signal like this.
After being provided with spectrum transformation unit 133; The digital signal that TMA provided by the invention not only can collect signal in the frequency acceptance band, conversion of signals in this frequency acceptance band is become to be convenient to transmit; 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; Confirm in the frequency acceptance band scope, the signal beyond the receive frequency is the Intermodulation Interference signal, and the spectral characteristic that will comprise signal in the frequency acceptance band of Intermodulation Interference signal shows through chart etc. intuitively.
Need to prove; The frequency spectrum of signal in the frequency acceptance band of spectrum transformation unit 133 outputs; Be meant and reflect the energy of signal on each frequency range or the information of distribute power situation in this frequency acceptance band; Both can be the energy of signal in the frequency acceptance band corresponding on each frequency or the size of power, also can be the energy of certain frequency range or the integration of power, and concrete form is not limit.
Concrete; Spectrum transformation unit 133 can be for being integrated with DSP (the Digital Signal Processor of DDC 1332 and spectrum transformation 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 transformation function, the present invention does not limit this.
Be illustrated in figure 6 as the TMA of an alternative embodiment of the invention, different with embodiment shown in Figure 5 is that in the present embodiment, spectrum transformation unit 133 also can comprise narrow band filter 1331.The input 13311 of narrow band filter 1331 links to each other with the output 13212 of ADC1321, and output 13312 links to each other with the input 13321 of DDC1332, is used for the digital signal of ADC1321 output is carried out frequency-division filter, and exports to DDC1332.For example, can the digital signal of ADC1321 output be divided into the multistage frequency range identical with the filtering bandwidth of narrow band filter 1331 and carry out filtering respectively, and export to DDC1332, thereby further improve quality of signals in the frequency acceptance band.The input 13321 of DDC1332 links to each other with the output 13312 of narrow band filter 1331, and being used for narrow band filter 1331 filtered digital signal Digital Down Converts is baseband signal.
Need to prove; The working band of narrow band filter 1331 is generally less than the frequency band of the digital signal of ADC1321 output; Carry out filtering for the digital signal that can make 1331 pairs of all ADC1321 outputs of narrow band filter, preferred, narrow band filter 1331 can be the bandwidth varying narrow band filter.Though this bandwidth varying narrow band filter bandwidth does not at a time cover the four corner of frequency acceptance band, but the passband translation of bandwidth varying narrow band filter, for example at a time; Its passband is 890MHz to 900MHz, and then next moment, its passband can be 900MHz to 1000MHz; Like this, just can realize covering, and avoid the use of a plurality of narrow band filters through the translation of passband to the target complete frequency band; Thereby further facilitate the collection of signal, reduce acquisition cost.
TMA in TMA shown in Figure 3 behind the increase spectrum transformation unit can be as shown in Figure 7.Need to prove that except that spectrum transformation unit 133, all characteristics embodiment illustrated in fig. 3 all are applicable to embodiment shown in Figure 7, repeat no more here.
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 TMA shown in Figure 6 increases control unit 1362, the TMA behind the increase control unit 1362 can be as shown in Figure 8.Except that control unit 1362, all characteristics in embodiment illustrated in fig. 6 all are applicable to embodiment shown in Figure 8.
Concrete, as shown in Figure 8, control unit 1362 is provided with first output 13621 and second output 13622.Wherein, first output 13621 is connected in the control end 13143 of frequency mixer 1314, is used to control the frequency range that frequency mixer 1314 outputs to the intermediate-freuqncy signal of second filter 1315; Second output 13622 is connected in the control end 13323 of DDC1332; Be used to control the frequency range that DDC1332 outputs to the baseband signal of spectrum transformation element 1333; So that the frequency range of the baseband signal of DDC1332 output is relevant with the frequency range of the intermediate-freuqncy signal of frequency mixer 1314 outputs, thereby make through the frequency range of signal in the frequency acceptance band in the signal behind frequency mixer 1314 and the DDC1332 and the circuit that accepts filter consistent.
Optional, control unit 1362 can be chip or the circuit structure with controlled function, the present invention does not limit this.
Further, after the 133 pairs of digital signals in spectrum transformation unit are carried out spectrum transformation, can be the frequency spectrum of signal in the frequency acceptance band with transformation results also through the interface of TMA, send out TMA.Same, if frequency spectrum and this interface compatibility of the interior signal of said frequency acceptance band then can directly be sent out by said interface.Otherwise, need could pass through this interface and send earlier with the spectral conversion one-tenth of signal in this frequency acceptance band and the signal of said interface compatibility.
For example; If TMA is the AISG interface with the extraneous interface that carries out digital communication; Signal level is incompatible in the frequency acceptance band after its interface level and the spectrum transformation; Therefore, can also increase the spectrum modulation unit to TMA shown in Figure 8 for Fig. 6, the TMA behind the increase spectrum modulation unit can be like Fig. 9 to shown in Figure 11.Wherein, The input 13521 of spectrum modulation unit 1352 links to each other with the output 13332 of spectrum transformation element 1333; Be used for the frequency spectrum of signal in the frequency acceptance band of spectrum transformation element 1333 outputs is modulated, thereby transfer out TMA through the AISG interface to convert to the compatible mutually signal of AISG interface.
Need to prove, the TMA that present embodiment provides, except that frequency spectrum modulating unit 1352, Fig. 6 is applicable to Fig. 9 to embodiment shown in Figure 11 respectively to all characteristics of embodiment shown in Figure 8, preamble has carried out detailed explanation, repeats no more here.Spectrum modulation unit 1352 that relates in the foregoing description or control unit 1362 or frequency mixer control unit 1363; It both can be discrete separately chip; Also can be the chip that integrates, can also be some other circuit structure, and the present invention does not limit this.
Need to prove that also the TMA that the embodiment of the invention provides comprises signal acquisition circuit, wherein, the signal acquisition circuit among the embodiment is merely explanation and usefulness, and it is said that its concrete form is not limited to embodiment.The circuit structure with signal testing function in the frequency acceptance band of other form is also within protection scope of the present invention.
In addition, in the previous embodiment, TMA all is signals in the frequency acceptance band of antenna is gathered in the working site of base station operate as normal.That is, shown in figure 12, reception and transmission that BTS port and the TMA1 of base station 2 through TMA1 carries out signal, TMA1 gathers and receives signal and receive the Intermodulation Interference signal that signal is followed, and sends base station 2 to through the AISG port.
Like this; Base station 2 and reception and the transmission work of TMA1 have not only effectively been accomplished to signal; And can under the normal operating conditions of base station 2, TMA1, confirm to gather signal in the frequency acceptance band that target is an antenna 3, saved equipment such as the duplexer in the known technology, frequency spectrograph, not only reduce acquisition cost; Avoided Intermodulation Interference by the miscellaneous equipment generation; And can be applicable to the scene of base station 2 work, signal in the frequency acceptance band of communication equipment such as monitoring aerial in real time, thereby the convenience and the flexibility that have further improved signals collecting.
In other embodiments of the invention, confirm on the test platform that TMA also can build in the laboratory that antenna or other gather the Intermodulation Interference signal of target.
For example, the sketch map that is applied in the test platform of building for TMA provided by the invention shown in Figure 13.Shown in figure 13, signal source one is respectively two signal generators 41 and 42 with signal source two, and they produce the two paths of signals that emission band is interior, frequency is different respectively, 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 through mixer 5.TMA1 also is provided with ANT port and AISG port, and wherein the ANT port of TMA1 links to each other with collection target 8, and the AISG port of TMA1 links to each other with computer 6.
Need to prove, in the present embodiment,, be equivalent to a duplexer, therefore, on test platform, need not to increase again extra duplexer, further reduced the cost of signals collecting because TMA1 inside is provided with accept filter circuit and transmission filter circuit.
Also need to prove; Because in the present embodiment; TMA1 is a spectrum signature of confirming the Intermodulation Interference signal on the test platform of in the laboratory, building; The antenna of gathering target 8 and being unlike in the working site, base station this moment equally receives the signal that the user sends, so does not comprise the transmission signal of the user terminal of reception in the signal of TMA1 test.
TMA1 provided by the invention; The on-site real-time that not only can work in the base station is monitored the also definite Intermodulation Interference signal wherein of signal in the frequency acceptance band of gathering target; Can also be applied on the test platform of building in the laboratory; Avoid the use of the equipment such as frequency spectrograph in the known technology, thereby reduced the cost of signals collecting, avoided the Intermodulation Interference signal that produces by other testing equipment simultaneously.
Need to prove that in the application of reality, antenna both transmitted, receive signal again, comparatively responsive to signal in the frequency acceptance band, so in the previous embodiment, generally confirm its Intermodulation Interference signal as gathering target with antenna.But the invention is not restricted to this, all can become the collection target of the TMA that the embodiment of the invention provides to the responsive objects of signal in the frequency acceptance band.For example, in order to eliminate the influence of Intermodulation Interference signal to certain precision instrument, will confirm the Intermodulation Interference signal to this precision instrument earlier, then 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 here.
Further, the TMA provided by the invention least interference that can collect can be estimated according to following method.At present, the system noise factor of each base station system can be estimated and be 3dB, and then antenna opening equivalence back noise is :-174+3=-171dBm/Hz.If require signal to noise ratio greater than 6dB, the least interference that TMA then provided by the invention can collect is :-171+6=-165dBm/Hz.
Need to prove that in the Intermodulation Interference signal, disturbing the strongest to the reception signal of base station is the third order intermodulation interference signal; Its centre frequency is 2f1-f2 or 2f2-f1; Just drop in the frequency acceptance band scope, wherein, f1 and f2 are respectively the frequencies of two different received signals.And the bandwidth of this third order intermodulation interference signal is the twice of carrier bandwidths.Therefore, gathering with 2f1-f2 or 2f2-f1 is centre frequency, with the signal that 2 times of carrier bandwidths are bandwidth, can confirm the spectrum signature of third order intermodulation interference signal.Because the bandwidth of the emission carrier wave of different standards is also inequality.For example; GSM (Global System of Mobile communication; Global system for mobile communications) carrier bandwidths is 200KHz; WCDMA (Wideband Code Division Multiple Access, WCDMA) carrier bandwidths is 5MHz etc., confirms the also corresponding difference of bandwidth of the signal frequency that the spectrum signature of Intermodulation Interference signal is gathered.
Same, when confirming the spectrum signature of Intermodulation Interference signal, the signals collecting precision also can be different owing to the difference of the maximum carrier bandwidths under the different systems.Concrete; Can gather for GSM standard TMA and to be low to moderate-signal of 112dBm; For UMTS (Universal Mobile Telecommunications System, UMTS) standard, TMA can gather and be low to moderate-signal of 99dBm; Can gather for LTE (Long Term Evolution, Long Term Evolution) standard TMA and to be low to moderate-signal of 92dBm.
The embodiment of the invention also provides a kind of antenna, comprises any TMA in the previous embodiment, can realize the useful technique effect that said TMA can reach, and preamble specifies, and repeats no more here.
One of ordinary skill in the art will appreciate that: all or part of flow process that realizes said method embodiment can be accomplished through the relevant hardware of computer program instructions; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of said claim.
Claims (12)
1. a tower amplifier comprises the emission filter circuit and accepts filter circuit, it is characterized in that, also comprises:
Signal acquisition circuit, said signal acquisition circuit links to each other with the said circuit that accepts filter, and is used to gather the interior signal of frequency acceptance band of the said circuit that accepts filter.
2. tower amplifier according to claim 1 is characterized in that,
Said signal acquisition circuit comprises:
Down-converter unit is used for signal in the frequency acceptance band of the said circuit output that accepts filter is down-converted to intermediate-freuqncy signal;
AD conversion unit links to each other with said down-converter unit, is used for the intermediate-freuqncy signal of said down-converter unit output is carried out analog-to-digital conversion and output.
3. tower amplifier according to claim 2 is characterized in that,
The said circuit that accepts filter comprises low noise amplifier;
Said down-converter unit comprises frequency mixer, and said AD conversion unit comprises analog to digital converter;
Wherein, the input of said frequency mixer links to each other with the output of said low noise amplifier, is used for signal in the frequency acceptance band of said low noise amplifier output is down-converted to intermediate-freuqncy signal;
The input of said analog to digital converter links to each other with the output of said frequency mixer, is used for the intermediate-freuqncy signal of said frequency mixer output is carried out analog-to-digital conversion and output;
Perhaps
The said circuit that accepts filter comprises low noise amplifier;
Said down-converter unit comprises first amplifier, first filter, frequency mixer and second filter, and said AD conversion unit comprises analog to digital converter;
Wherein, said first amplifier input terminal links to each other with the output of said low noise amplifier, is used to amplify the interior signal of frequency acceptance band of the said circuit output that accepts filter;
The input of said first filter links to each other with the output of said first amplifier, is used to receive the interior signal of frequency acceptance band of said first amplifier output, the interference signal that said first amplifier of filtering produces;
The input of said frequency mixer links to each other with the output of said first filter, is used for down-converting to intermediate-freuqncy signal through signal in the frequency acceptance band of said first filter;
The input of said second filter links to each other with the output of said frequency mixer, is used to receive the intermediate-freuqncy signal of said frequency mixer output, the interference signal that the said frequency mixer of filtering produces;
The input of said analog to digital converter links to each other with the output of said second filter, is used for the intermediate-freuqncy signal of said second filter output is carried out analog-to-digital conversion and output.
4. tower amplifier according to claim 3 is characterized in that,
Said signal acquisition circuit also comprises the frequency mixer control unit, and the output of said frequency mixer control unit is connected in said frequency mixer, is used to control the frequency range that said frequency mixer outputs to the intermediate-freuqncy signal of said second filter.
5. according to claim 3 or 4 described tower amplifiers, it is characterized in that,
Said signal acquisition circuit also comprises the conversion modulating unit, and the input of said conversion modulating unit links to each other with the output of said analog to digital converter, is used for the digital signal of said digital to analog converter output is modulated and exported.
6. according to claim 3 or 4 described tower amplifiers, it is characterized in that,
Said signal acquisition circuit also comprises the spectrum transformation unit, and the input of said spectral conversion unit links to each other with the output of said analog to digital converter, is used for the digital signal of said analog to digital converter output is carried out spectrum transformation and output.
7. tower amplifier according to claim 6 is characterized in that,
Said spectrum transformation unit comprises digital down converter and spectrum transformation element;
The input of said digital down converter links to each other with the output of said analog to digital converter, and the digital signal Digital Down Convert that is used for said analog to digital converter output is a baseband signal;
The input of said spectrum transformation element links to each other with the output of said digital down converter, is used for the baseband signal of said digital down converter output is carried out spectrum transformation to export the frequency spectrum of signal in the said frequency acceptance band.
8. tower amplifier according to claim 7; It is characterized in that; Said spectrum transformation unit also comprises narrow band filter, and the input of said narrow band filter links to each other with the output of said analog to digital converter, and output links to each other with the input of said digital down converter; Be used for the digital signal of said analog to digital converter output is carried out frequency-division filter, and export to said digital down converter.
9. tower amplifier according to claim 7 is characterized in that,
Said signal acquisition circuit also comprises the spectrum modulation unit, and the input of said spectrum modulation unit links to each other with the output of said spectrum transformation element, is used for the frequency spectrum of signal in the frequency acceptance band of said spectrum transformation element output is modulated.
10. according to each described tower amplifier in the claim 7 to 9, it is characterized in that,
Said signal acquisition circuit also comprises control unit, and said control unit is provided with first output and second output;
Wherein, said first output is connected in said frequency mixer, is used to control the frequency range that said frequency mixer outputs to the intermediate-freuqncy signal of said second filter;
Said second output is connected in said digital down converter, is used to control the frequency range that said digital down converter outputs to the baseband signal of said spectrum transformation element.
11. tower amplifier according to claim 7 is characterized in that, said spectrum transformation unit is digital signal processing chip or field programmable gate array chip or the dedicated IC chip that is integrated with said digital down converter and spectrum transformation element.
12. an antenna comprises any described tower amplifier of claim 1-11.
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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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10917054B2 (en) | 2016-08-29 | 2021-02-09 | 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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| 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 |
|---|---|---|---|---|
| US10917054B2 (en) | 2016-08-29 | 2021-02-09 | Huawei Technologies Co., Ltd. | Tower mounted amplifier |
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