CN101588187B - Radio-frequency signal transceiver and communication system using same - Google Patents
Radio-frequency signal transceiver and communication system using same Download PDFInfo
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- CN101588187B CN101588187B CN200810301748XA CN200810301748A CN101588187B CN 101588187 B CN101588187 B CN 101588187B CN 200810301748X A CN200810301748X A CN 200810301748XA CN 200810301748 A CN200810301748 A CN 200810301748A CN 101588187 B CN101588187 B CN 101588187B
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Abstract
The invention discloses a radio-frequency signal communication system, which comprises antennas of wireless communication. Radio-frequency signals received by the antennas are sent to a basic frequency module through a receiving route of the system. A transmitting route of the system comprises a predistortion execution unit and an amplifier, wherein the predistortion execution unit is used for carrying out predistortion on the signals of the transmitting route to compensate distortion of the amplifying function of the amplifier. A coupler is used to acquire parts of radio-frequency signals sent by the amplifier as feedback signals of the predistortion, and the system makes the feedback signals and the signals received by the antennas multiplex the receiving route in a time sharing mode.
Description
Technical field
The present invention relates to wireless telecommunications, relate in particular to a kind of radio-frequency signal transceiver with amplifier pre-distortion function.
Background technology
Wireless communication apparatus, such as the base station of wireless network, cellular wireless telecommunications, signal repeater (Repeater) etc. all can use power amplifier (Power Amplifier) to amplify radiofrequency signal.The input signal of amplifier has nonlinear problem (Non-linearity) by after amplifying between input signal and the output signal.Before the signal input amplifier, can carry out pre-distortion (Predistortion) to improve described nonlinear problem with numerical distortions device (Digital Distorter).
If be connected with long cable between wireless communication apparatus power amplifier and the antenna, though signal by predistortion and power amplification, still has larger power loss when being sent to antenna after by cable.Yet for management and the maintenance that makes things convenient for equipment, many communication systems all are to connect in this way power amplifier and antenna at present.For instance, traditional wireless communication base platform is placed on power amplifier and numerical distortions device indoor usually, and with cable transmit amplify after radiofrequency signal to being positioned at outdoor antenna.This practice can cause at cable and transmit radio frequency (Radio Frequency the is called for short RF) power loss that signal is larger.
Summary of the invention
In order to reduce the power loss of radiofrequency signal, the invention provides a kind of radio-frequency signal transceiver, couple fundamental module, and comprise antenna, RX path, transfer path, coupler, changeover module, controller and processor.Described antenna is used for by wireless communication channel with output or received RF signal.Described RX path is used for for the radiofrequency signal by described antenna reception by described RX path to deliver to described fundamental module.Described transfer path is used for being passed to described antenna to send for the signal from described fundamental module by described transfer path.Described transfer path comprises modulator, digital to analog converter and amplifier.Described modulator receives and modulation amount position signal from described fundamental module.Described digital to analog converter receives and processes digital signal behind the described modulation to produce analog signal.Described amplifier receives and amplifies described analog signal producing the analog signal after amplifying, and sends out analog signal after the described amplification by described antenna.Described coupler is used for being received from a part of signal that described amplifier is sent.Changeover module couples described RX path.Controller is used for controlling described changeover module to couple described RX path to described coupler or described antenna.Described processor, when described RX path is coupled to described coupler, the described modulator of a part of signal controlling that receives according to described coupler is with the executive signal predistortion.
The invention provides a kind of radiofrequency signal communication system, couple fundamental module, and comprise antenna, RX path, transfer path, coupler, changeover module, controller and processor.Described antenna is used for by wireless communication channel with output or received RF signal.Described RX path is used for for the radiofrequency signal by described antenna reception by described RX path to deliver to described fundamental module.Described transfer path is used for being passed to described antenna to send for the signal from described fundamental module by described transfer path.Described transfer path comprises modulator, digital to analog converter and amplifier.Described modulator receives and modulation amount position signal from described fundamental module.Described digital to analog converter receives and processes digital signal behind the described modulation to produce analog signal.Described amplifier receives and amplifies described analog signal producing the analog signal after amplifying, and sends out analog signal after the described amplification by described antenna.Described coupler is used for being received from a part of signal that described amplifier is sent.Changeover module couples described RX path.Controller is used for controlling described changeover module to couple described RX path to described coupler or described antenna.Described processor, when described RX path is coupled to described coupler, the described modulator of a part of signal controlling that receives according to described coupler is with the executive signal predistortion.
The invention provides a kind of radiofrequency signal communication system, comprise antenna, RX path, transfer path, coupler, changeover module, reach controller.Described antenna is used for by wireless communication channel with output or received RF signal.Described RX path is used for for the radiofrequency signal by described antenna reception by described RX path to deliver to a fundamental module.Described transfer path is used for being passed to described antenna to send for the signal from described fundamental module by described transfer path.Described transfer path comprises predistortion performance element and amplifier.Described predistortion performance element is used for the signal on the described transfer path is carried out predistortion.Described amplifier receives and amplifies signal after the described pre-distortion producing the analog signal after amplifying, and sends out analog signal after the described amplification by described antenna.Described coupler is used for being received from a part of signal that described amplifier is sent.Described changeover module couples described RX path.Described controller is used for detecting whether signal is arranged on the described transfer path, and according to described detecting result to control described changeover module to couple described RX path to described coupler or described antenna.A part of signal that wherein said predistortion performance element is obtained and utilized described coupler to receive from described RX path is with the executive signal predistortion.
Transceiver of the present invention and communication system can effectively reduce the power loss of radiofrequency signal by shortening the distance between power amplifier and the antenna.
Description of drawings
Fig. 1 is the structural representation of the execution mode of wireless telecommunication system.
Fig. 2 is the structural representation of execution mode of the internal module of wireless telecommunication system.
Fig. 3 is the structural representation of execution mode of the external module of wireless telecommunication system.
Fig. 4 is the internal module of wireless telecommunication system and the channel schematic diagram between the external module.
Fig. 5 is the direct current injector of wireless telecommunication system and the structural representation that direct current is derived the execution mode of device.
Embodiment
Please refer to Fig. 1, wireless telecommunication system 100 is the devices that can receive and dispatch radiofrequency signal, for example the base station of wireless telecommunications or transponder (Repeater).Described base station or transponder can be to meet 802.11 standard (being WiFi) of the Institute of Electrical and Electronics Engineers (IEEE) (Institute ofFlectrical and Flectronics Engineers, IEEE) or the wireless network of 802.16 standard (being WiMAX), base station or the transponder of cellular wireless telecommunications.Wireless telecommunication system 10 (comprises radio-frequency module 101 and fundamental module 30.Fundamental module 30 is for the treatment of fundamental frequency signal (Baseband Signal).Radio-frequency module 101 conversions become intermediate-freuqncy signal (Immediate Frequency Signal) and radiofrequency signal (RadioFrequency Signal) from the fundamental frequency signal of fundamental module 30, and the radiofrequency signal that conversion receives from radio channel becomes intermediate-freuqncy signal and fundamental frequency signal.
Radio-frequency module 101 more comprises external module 10 and internal module 20.Channel 102 connects external module 10 and internal module 20.Need to be appreciated that, can connect to consist of path 10 2 with one or more cable between external module 10 and the internal module 20, perhaps the transmission medium with other connects, for example optical fiber.Internal module 20 modulation fundamental frequency signals.External module 10 internally module 20 receives signal, and after amplifying described signal, the antenna 103 that passes through to connect sends, and perhaps receives signal from antenna 103, after amplifying described signal, is sent to internal module 20 by channel 102.Fundamental module 30 can be integrated into same device with internal module 20, or two devices that separate.Fig. 2 and Fig. 3 show respectively the execution mode of internal module 20 and external module 10.
Can comprise a plurality of subchannels in the channel 102 to transmit respectively transmitted signal, reception signal, frequency signal, control signal and the electric power signal between external module 10 and the internal module 20.With reference to Fig. 4, channel 102 comprises subchannel P100, P102, P103, P104 and P105.For instance, subchannel P100, P102, P103 and P104 are respectively the frequency band of rough 400,300,10 and 200 megahertzs (mega hertz, MHz), yet are not to be defined in this.Subchannel P100 is used for transmission and delivers to the transmitted signal of attenuator PAD11 from attenuator (Attenuator Pad) PAD1.Subchannel P102 is used for attenuator PAD2 is delivered in transmission from attenuator PAD12 reception signal.Subchannel P103 is used for the frequency signal between transmission attenuation device PAD3 and the attenuator PAD13.Subchannel P104 is used for the control signal between transmission attenuation device PAD4 and the attenuator PAD14.Subchannel P105 is used for internally module 20 transmission direct currents to external module 10.Details are as follows for the transmission path of described each signal in wireless telecommunication system 100.
The frequency signal transmission path:
With reference to Fig. 2, frequency divider (Clock Distributor) 15 provides a plurality of assemblies of frequency signal (Clock) to the internal module 20, for example synthesizer (Synthesizer) SYN1 and SYN2, and by band pass filter (Band PassFilter) BPF3, attenuator PAD3, compile/disperser 201 and channel 102 to be to provide a plurality of assemblies of frequency signal to the external module 10.Comprise buffer (Buffer) in the frequency divider 15, be used for the frequency signal of incoming frequency distributor 15 is isolated and output with buffer.
With reference to Fig. 3, frequency divider 15 provide frequency signal by channel 102, compile/disperser 301, attenuator PAD13 and band pass filter BPF13 deliver to frequency divider 314.Frequency divider 314 is distributed to frequency signal a plurality of assemblies in the external module 10, for example synthesizer SYN3 and RF modulator-demodulator 315 again.Comprise buffer (Buffer) in the frequency divider 314, be used for the frequency signal of incoming frequency distributor 314 is isolated and output with buffer.
The control signal transmission path:
The transmitted signal transmission path:
With reference to Fig. 2, modulator 13 receives digital signal from fundamental module 30, and described digital signal is carried out predistortion with the distortion of amplifier on enlarging function of compensation wireless telecommunication system 100, and the described digital signal of modulation.Digital signal processor 11 is controlled modulator 13 with the combine digital predistortion according to the input signal of its reception.The input signal of digital signal processor 11 be utilize coupler 313 sampling amplifiers 306 to transmit and.Digital to analog converter 12 receives and processes digital signal behind the described modulation to produce analog signal.Described analog signal is by after the low pass filter LPF1 filtering, and synthesizer SYN1 produces periodic signal from the frequency that frequency divider 15 provides, and blender 203 mixes filtered signal with described periodic signal.Described mixed signal arrives after by band pass filter BPF1 filtering and attenuator PAD1 and compiles/disperser 201, by compile/disperser 201 is sent to external module 10 with the signal from PAD3 and PAD4 by channel 102.Direct voltage VDC also delivers to channel 102 by direct current injector 202, delivers to external module 10 by channel 102 again.
With reference to Fig. 3, the direct current in the direct current derivation device 302 derivation path 10s 2 is to DC-DC converter 303.DC-DC converter 303 provides direct current each assembly to external module 10.Internal module 20 transmits electric energy to external module 10 by channel 102 by this, to provide external module 10 work required electric energy.Fig. 5 shows the execution mode of direct current injector 202 and direct current derivation device 302.Direct current injector 202 can be formed by connecting by capacitor C 2 and coil W2.Direct current injector 302 can be formed by connecting by capacitor C 3 and coil W3.
Signal in the channel 102 by compile/disperser 301 delivers to attenuator PAD11, PAD13 and PAD14, and by band pass filter BPF11, BPF13 and BPF14 filtering.Deliver to amplifier TA1 and power detecting device PD1 by the filtered signal of BPF11.When power detecting device PD1 detects signal power between BPF11 and the amplifier TA1 greater than a predetermined value, output signal to on-off controller 305.On-off controller 305 according to the signal of power detecting device PD1 output with control switch SW1 and SW2 and power amplifier 306.The control program of on-off controller 305 will illustrate after a while.
Amplifier TA1 delivers to blender (Mixer) 307 after filtered signal is amplified.The signal that blender 307 mixer oscillators 308 provide and the amplifying signal that receives from amplifier TA1, and be sent to band pass filter BPF15 and carry out filtering.After the filtered signal of filter BPF15 is sent to amplifier TA2 and 306 and amplifies, be sent to wireless communication channel by circulator (Circulator) 310 and antenna 103.
BPF11 is used for filtering intermediate frequency signal, for instance, is used for obtaining the signal of 20 ~ 400MHz, and BPF15 is used for filtering radiofrequency signal, for instance, is used for obtaining the signal of 800 ~ 3500MHz.Amplifier TA1 and 2 is in different frequency work, and is used for distributing different gain (Gain).
Receive signal transmission path:
Sequentially deliver to terminal a, amplifier RA2 and the band pass filter BPF16 of interrupteur SW 1, amplifier RA1, interrupteur SW 2 from the signal of wireless communication channel reception by antenna 103 and circulator 310.Signal by band pass filter BPF16 filtering is delivered to blender 311, and the signal that provides with oscillator 312 mixes.Described blender 311 mixed signals are delivered to by amplifier RA3, band pass filter BPF12 and attenuator PAD12 and are compiled/disperser 301, deliver to internal module 20 by channel 102 again.
With reference to Fig. 2, deliver to by channel 102 from the signal of PAD12 and to compile/disperser 201, by after PAD2 and the band pass filter BPF2 filtering, deliver to blender 204 and mix with the signal that synthesizer SYN2 provides again.The frequency signal that synthesizer SYN2 utilizes frequency divider 15 to provide produces periodic signal.Described mixed signal is delivered to analog-to-digital converter 14 and is converted to digital signal by after the low pass filter LPF2 filtering, then delivers to fundamental module 30.Also has transmission path 206 to be connected the two between analog-to-digital converter 14 and the Digital System Processor 11.Wireless telecommunication system 100 can be fed back to Digital System Processor 11 by described transmission path 206 by the sampled signal of the radio frequency signal that antenna 103 is launched, Digital System Processor 11 according to the feedback signal that receives from transmission path 206 to adjust the performed digital pre-distortion of adjuster 13.
When power detecting device PD1 detected signal power on the transmitted signal path greater than predetermined value, this moment, communication system 100 transmitted signal, and on-off controller 305 control switch SW1 and SW2 are to couple described RX path to coupler 313.That is interrupteur SW 1 switches to the position of terminal d; And interrupteur SW 2 switches to the position of terminal b.When power detecting device PD1 detected signal power on the transmitted signal path less than described predetermined value, this moment, communication system 100 received signal, and on-off controller 305 control switch SW1 and SW2 are to couple described RX path to antenna 103.That is interrupteur SW 1 switches to the position of terminal c; And interrupteur SW 2 switches to the position of terminal a.
Such practice each assembly on can time-sharing multiplex signal RX path, and do not need extra being used for specially to transmit path and the assembly of the feedback signal of digital pre-distortion.
In other embodiments, on-off controller 305 also can combine with controller 316.Amplifier quantity in the wireless telecommunication system 100 can be adjusted.
In a word, described wireless telecommunication system 100 has transfer path and RX path.Signal from fundamental module 30 is passed to antenna 103 to send by described transfer path; The radiofrequency signal that receives by antenna 103 by described RX path to deliver to fundamental module 30.Wireless telecommunication system 100 has controller and is used for the control changeover module to couple described RX path to coupler 313 or antenna 103.When described RX path is coupled to coupler 313, Digital System Processor 11 is carried out predistortion according to a part of signal that described coupler 313 receives.Such practice can be used each assembly on the signal RX path fully, and does not need another one to be used for specially transmitting the path of the feedback signal of digital pre-distortion.
Claims (14)
1. a radio-frequency signal transceiver couples fundamental module, it is characterized in that comprising:
Antenna is used for by wireless communication channel with output or received RF signal;
The RX path unit is used for for the radiofrequency signal by described antenna reception by described RX path unit to deliver to described fundamental module;
The transfer path unit is used for being passed to described antenna to send for the signal from described fundamental module by described transfer path unit, and described transfer path unit comprises:
Modulator, from described fundamental module receive and the modulation digital signal to produce the digital signal behind the modulation;
Digital to analog converter receives and processes digital signal behind the described modulation to produce analog signal; And
Amplifier receives and amplifies described analog signal with the analog signal after produce amplifying, and sends out analog signal after the described amplification by described antenna;
Coupler is used for being received from a part of signal that described amplifier is sent;
Changeover module couples described RX path unit;
Controller is used for controlling described changeover module to couple described RX path unit to described coupler or described antenna; And
Processor, when described RX path unit is coupled to described coupler, the described modulator of a part of signal controlling that receives according to described coupler is with the executive signal predistortion.
2. radio-frequency signal transceiver as claimed in claim 1 it is characterized in that described transfer path unit more comprises the combination of the first blender, and described RX path unit more comprises the combination of the second blender;
Wherein said the first blender combination comprises the first blender and the second blender, described the first blender is used for utilizing described analog signal to mix the letter signal to described the second blender to produce and to transmit first, described first mixes the letter signal is used for being sent to described the second blender at the first frequency band, state the second blender and be used for utilizing described first to mix the letter signal and mix the letter signal to described amplifier to produce and to transmit second, described amplifier utilizes described second to mix the letter signal and produce analog signal after the described amplification as analog signal;
Wherein the combination of the second blender comprises the 3rd blender and the 4th blender, described the 3rd blender is used for utilizing the described radiofrequency signal of described antenna reception or the described part signal of described coupler reception to mix the letter signal to described the 4th blender to produce and to transmit the 3rd, the described the 3rd mixes the letter signal is used for being sent to described the 3rd blender at the second frequency band, described the second frequency band is different from described the first frequency band, and described the 4th blender is used for utilizing the described the 3rd to mix the letter signal to produce and to transmit the 4th mixing letter signal to described fundamental module;
Described radio-frequency signal transceiver more comprises:
The first module comprises described the first blender, described the 4th blender, described modulator and described digital to analog converter; And
The second module is used for being connected in described the first module by cable, and described the second module comprises described the second blender, described the 3rd blender and described amplifier, and described analog signal is sent to described amplifier by described cable;
Wherein said modulator is carried out described signal predistortion with the distorted signals on the enlarging function that compensates described amplifier.
3. radio-frequency signal transceiver as claimed in claim 2 is characterized in that, described amplifier is power amplifier, is only connected by described cable between described first and second module.
4. radio-frequency signal transceiver as claimed in claim 2, it is characterized in that, the radiofrequency signal of described antenna reception from described the second module by described cable to deliver to described the first module and described fundamental module, described RX path unit more comprises two or more amplifier, the described part signal that the described radiofrequency signal of described antenna reception or described coupler receive is responded the switching of described changeover module, accepts respectively the amplification of the amplifier of varying number and processes.
5. radio-frequency signal transceiver as claimed in claim 4 is characterized in that, described the first module comprises described processor, a part of signal that described coupler receives by described cable to deliver to described processor.
6. radio-frequency signal transceiver as claimed in claim 5 is characterized in that, described the first module transmits electric energy to described the second module, to provide described the second module work required electric energy by described cable.
7. radio-frequency signal transceiver as claimed in claim 1 is characterized in that, when described controller detects signal on the described transfer path unit, controls described changeover module to couple described RX path unit to described coupler.
8. radio-frequency signal transceiver as claimed in claim 7 is characterized in that, when described controller detects on the described transfer path unit no signal, controls described changeover module to couple described RX path unit to described antenna.
9. radiofrequency signal communication system is characterized in that comprising:
Antenna is used for by wireless communication channel with output or received RF signal;
The RX path unit is used for for the radiofrequency signal by described antenna reception by described RX path unit to deliver to a fundamental module;
The transfer path unit is used for being passed to described antenna to send for the signal from described fundamental module by described transfer path unit, and described transfer path unit comprises:
The predistortion performance element is used for the signal on the described transfer path unit is carried out predistortion; And
Amplifier receives and amplifies signal after the described pre-distortion producing the analog signal after amplifying, and sends out analog signal after the described amplification by described antenna;
Coupler is used for being received from a part of signal that described amplifier is sent;
Changeover module couples described RX path unit; And
Controller is used for detecting on the described transfer path unit whether signal is arranged, and according to described detecting result to control described changeover module to couple described RX path unit to described coupler or described antenna;
A part of signal that wherein said predistortion performance element is obtained and utilized described coupler to receive from described RX path unit is with the executive signal predistortion.
10. radiofrequency signal communication system as claimed in claim 9 is characterized in that, described predistortion performance element more comprises:
Modulator receives and modulation one digital signal from described fundamental module; And
Processor, when described RX path unit is coupled to described coupler, the described modulator of a part of signal controlling that receives according to described coupler is with the executive signal predistortion.
11. radiofrequency signal communication system as claimed in claim 9, it is characterized in that, described controller control described changeover module make transmit in the described RX path unit in send described radiofrequency signal that signal comprises described antenna reception or described coupler to receive described part signal, described transfer path unit more comprises the combination of the first blender, and described RX path unit more comprises the combination of the second blender;
Wherein said the first blender combination comprises the first blender and the second blender, described the first blender is used for utilizing the signal after the described pre-distortion to mix the letter signal to described the second blender to produce and to transmit first, described first mixes the letter signal is used for being sent to described the second blender at the first frequency band, state the second blender and be used for utilizing described the first mixing to believe that signal mixes extremely described amplifier of letter signal to produce and to transmit second, the signal after described amplifier utilizes described the second mixing letter signal as described pre-distortion produces the analog signal after the described amplification;
Wherein the combination of the second blender comprises the 3rd blender and the 4th blender, described the 3rd blender is used for utilizing and send signal to mix the letter signal to described the 4th blender to produce and to transmit the 3rd in described RX path unit transmits, the described the 3rd mixes the letter signal is used for being sent to described the 3rd blender at the second frequency band, described the second frequency band is different from described the first frequency band, and described the 4th blender is used for utilizing the described the 3rd to mix the letter signal to produce and to transmit the 4th mixing letter signal to described fundamental module;
Described radiofrequency signal communication system more comprises:
The first module comprises described the first blender, described the 4th blender and described predistortion performance element, and described predistortion performance element is used for carrying out described signal predistortion with the distorted signals on the enlarging function that compensates described amplifier; And
The second module is used for being connected in described the first module by cable, and described the second module comprises described the second blender, described the 3rd blender and described amplifier, and the signal after the described pre-distortion is sent to described amplifier by described cable.
12. radiofrequency signal communication system as claimed in claim 9 is characterized in that when described controller detects signal on the described transfer path unit, controls described changeover module to couple described RX path unit to described coupler.
13. radiofrequency signal communication system as claimed in claim 12, it is characterized in that when described controller detects on the described transfer path unit no signal, control described changeover module to couple described RX path unit to described antenna, described RX path unit more comprises two or more amplifier, the described part signal that the described radiofrequency signal of described antenna reception or described coupler receive is responded the switching of described changeover module, accepts respectively the amplification of the amplifier of varying number and processes.
14. radiofrequency signal communication system as claimed in claim 9 is characterized in that described communication system is wireless communication base platform or transponder.
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| CN200810301748XA CN101588187B (en) | 2008-05-23 | 2008-05-23 | Radio-frequency signal transceiver and communication system using same |
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| CN200810301748XA CN101588187B (en) | 2008-05-23 | 2008-05-23 | Radio-frequency signal transceiver and communication system using same |
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| CN101588187B true CN101588187B (en) | 2013-01-09 |
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| TW201524141A (en) * | 2013-12-13 | 2015-06-16 | Amoesolu Corp | Distributed antenna system |
| KR102372526B1 (en) * | 2017-12-22 | 2022-03-10 | 삼성전자주식회사 | Electronic apparatus for transmitting and receving wireless signal and controlling method thereof |
| CN114039619B (en) * | 2021-09-28 | 2023-05-09 | 三维通信股份有限公司 | Zero intermediate frequency radio frequency front-end circuit, system, radio frequency unit protection method and medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1604577A (en) * | 2003-09-30 | 2005-04-06 | 因芬尼昂技术股份公司 | Electropult with adaptive figure preidstortion, receiver and receptor possessing same ,method for operating same |
| US6987954B2 (en) * | 2001-05-15 | 2006-01-17 | Research In Motion Limited | Feedback compensation detector for a direct conversion transmitter |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6987954B2 (en) * | 2001-05-15 | 2006-01-17 | Research In Motion Limited | Feedback compensation detector for a direct conversion transmitter |
| CN1604577A (en) * | 2003-09-30 | 2005-04-06 | 因芬尼昂技术股份公司 | Electropult with adaptive figure preidstortion, receiver and receptor possessing same ,method for operating same |
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