CN101588187A - 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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- CN101588187A CN101588187A CNA200810301748XA CN200810301748A CN101588187A CN 101588187 A CN101588187 A CN 101588187A CN A200810301748X A CNA200810301748X A CN A200810301748XA CN 200810301748 A CN200810301748 A CN 200810301748A CN 101588187 A CN101588187 A CN 101588187A
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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, for example 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).
Between wireless communication apparatus power amplifier and the antenna if be connected, though signal by predistortion and power amplification, still has bigger power loss when being sent to antenna after by cable with long cable.Yet the management and the maintenance of equipment for convenience, many communication systems all are to connect power amplifier and antenna in this way at present.For instance, traditional wireless communication base platform is placed on power amplifier and numerical distortions device indoor usually, and transmits with cable and to amplify the back 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 bigger.
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 that receives by described antenna 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 handles 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 goes out analog signal after the described amplification by described antenna transmission.Described coupler is used to be received from a part of signal that described amplifier is sent.Changeover module couples described RX path.Controller is used to control 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, according to the described modulator of a part of signal controlling that described coupler received to carry out 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 that receives by described antenna 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 handles 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 goes out analog signal after the described amplification by described antenna transmission.Described coupler is used to be received from a part of signal that described amplifier is sent.Changeover module couples described RX path.Controller is used to control 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, according to the described modulator of a part of signal controlling that described coupler received to carry out 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 that receives by described antenna 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 goes out analog signal after the described amplification by described antenna transmission.Described coupler is used to be received from a part of signal that described amplifier is sent.Described changeover module couples described RX path.Described controller is used to detect 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 to carry out 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 the Institute of Electrical and Electronics Engineers (IEEE) (Institute ofElectrical and Electronics Engineers, 802.11 the standard (being WiFi) IEEE) or the wireless network of 802.16 standard (being WiMAX), the base station or the transponder of cellular wireless telecommunications.Wireless telecommunication system 100 comprises radio-frequency module 101 and fundamental module 30.Fundamental module 30 is used to handle 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 be appreciated that can connect to constitute 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 is module 20 received signals internally, and after amplifying described signal, the antenna 103 that passes through to be connected sends, and perhaps from antenna 103 received signals, 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 the execution mode of internal module 20 and external module 10 respectively.
Can comprise a plurality of subchannels in the channel 102 to transmit transmission signal, received signal, frequency signal, control signal and the electric power signal between external module 10 and the internal module 20 respectively.With reference to Fig. 4, channel 102 comprises subchannel P100, P102, P103, P104 and P105.For instance, subchannel P100, P102, P103 and P104 be respectively rough 400,300,10 and 200 megahertzs (mega hertz, frequency band MHz), yet be not to be defined in this.Subchannel P100 is used for attenuator PAD11 is delivered in transmission from attenuator (Attenuator Pad) PAD1 transmission signal.Subchannel P102 is used to transmit the received signal of delivering to attenuator PAD2 from attenuator PAD12.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:
Send signal transmission path:
With reference to Fig. 2, modulator 13 receives digital signal from fundamental module 30, and described digital signal is carried out amplifier the distortion on enlarging function of predistortion with 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 handles 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, direct current derive device 302 derive in the path 10s 2 direct current to direct current to direct current transducer 303.Direct current provides direct current each assembly to external module 10 to direct current transducer 303.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.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.The filtered signal of filter BPF15 is sent to after amplifier TA2 and 306 amplifies, and is sent to wireless communication channel by circulator (Circulator) 310 and antenna 103.
BPF11 is used for filtering intermediate frequency signal, for instance, is used to obtain the signal of 20 ~ 400MHz, and BPF15 is used for filtering radiofrequency signal, for instance, is used to obtain the signal of 800 ~ 3500MHz.Amplifier TA1 and 2 is in different frequency work, and is used for distributing different gain (Gain).
The received signal transmission path:
Deliver to terminal a, amplifier RA2 and the band pass filter BPF16 of switch SW 1, amplifier RA1, switch SW 2 in regular turn 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 again with the signal that synthesizer SYN2 provides.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, delivers to fundamental module 30 then.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.
Switch SW 2 can connecting terminal a or b to the output of switch SW 2, use signal that decision output antenna 103 or coupler 313 received to amplifier RA2.The signal that antenna 103 is received is delivered to terminal a after by circulator 310, switch SW 1, amplifier RA1.Coupler 313 acquisition parts by shunt (Splitter) 321 and attenuator PAD5, are delivered to the signal of acquisition the terminal b of switch SW 2 from the radiofrequency signal of amplifier 306 emissions.Since transmitting and receive, the signal of wireless telecommunication system 100 can not carry out simultaneously, on-off controller 305 according to power detecting device PD1 output signal with control switch SW1 and SW2, when wireless telecommunication system 100 transmits radiofrequency signal, allow the signal of coupler 313 acquisitions deliver to Digital System Processor 11 by the RX path of wireless telecommunication system 100.Digital System Processor 11 carries out digital pre-distortion according to the signal controlling modulator 13 of described acquisition again.When wireless telecommunication system 100 received radio frequency signals, the signal that allows antenna 103 receive can be delivered to fundamental module 30 by last RX path, and this moment, on-off controller 305 can shutdown amplifier 306.
When power detecting device PD1 detected the signal power that sends on the 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 switch SW 1 switches to the position of terminal d; And switch SW 2 switches to the position of terminal b.When power detecting device PD1 detects the signal power that sends on the signal path less than described predetermined value, this moment communication system 100 just in received signal, on-off controller 305 control switch SW1 and SW2 are to couple described RX path to antenna 103.That is switch SW 1 switches to the position of terminal c; And switch 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 the 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 to 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 is received.Such practice can be used each assembly on the signal RX path fully, and does not need another one to be used for transmitting the path of the feedback signal of digital pre-distortion specially.
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;
RX path is used for for the radiofrequency signal that receives by described antenna by described RX path to deliver to described fundamental module;
Transfer path is used for being passed to described antenna to send for the signal from described fundamental module by described transfer path, and described transfer path comprises:
Modulator receives and the modulation digital signal from described fundamental module;
Digital to analog converter receives and handles 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 goes out analog signal after the described amplification by described antenna transmission;
Coupler is used to be received from a part of signal that described amplifier is sent;
Changeover module couples described RX path;
Controller is used to control described changeover module to couple described RX path to described coupler or described antenna; And
Processor, when described RX path is coupled to described coupler, according to the described modulator of a part of signal controlling that described coupler received to carry out signal predistortion.
2. radio-frequency signal transceiver as claimed in claim 1 is characterized in that more comprising:
First module comprises described modulator and described digital to analog converter; And
Second module is connected in described first module by cable, and described second module comprises 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 a power amplifier, is only connected by described cable between described first and second module.
4. radio-frequency signal transceiver as claimed in claim 2 is characterized in that, the radiofrequency signal that described antenna receives from described second module by described cable to deliver to described first module and described fundamental module.
5. radio-frequency signal transceiver as claimed in claim 4 is characterized in that, described first module comprises described processor, a part of signal that described coupler received by described cable to deliver to described processor.
6. radio-frequency signal transceiver as claimed in claim 5 is characterized in that, described first module transmits electric energy to described second module, to provide the described 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, controls described changeover module to couple described RX path 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 no signal, controls described changeover module to couple described RX path 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;
RX path is used for for the radiofrequency signal that receives by described antenna by described RX path to deliver to a fundamental module;
Transfer path is used for being passed to described antenna to send for the signal from described fundamental module by described transfer path, and described transfer path comprises:
The predistortion performance element is used for the signal on the described transfer path is carried out predistortion; And
Amplifier receives and amplifies signal after the described pre-distortion producing the analog signal after amplifying, and goes out analog signal after the described amplification by described antenna transmission;
Coupler is used to be received from a part of signal that described amplifier is sent;
Changeover module couples described RX path; And
Controller is used to detect 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 to carry out 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 is coupled to described coupler, according to the described modulator of a part of signal controlling that described coupler received to carry out signal predistortion.
11. radiofrequency signal communication system as claimed in claim 9 is characterized in that more comprising:
First module comprises described predistortion performance element, and described predistortion performance element is used to carry out described signal predistortion with the distorted signals on the enlarging function that compensates described amplifier; And
Second module is connected in described first module by cable, and described second module comprises 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, controls described changeover module to couple described RX path to described coupler.
13. radiofrequency signal communication system as claimed in claim 12 is characterized in that when described controller detects on the described transfer path no signal, controls described changeover module to couple described RX path to described antenna.
14. radiofrequency signal communication system as claimed in claim 9 is characterized in that described communication system is wireless communication base platform or transponder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810301748XA CN101588187B (en) | 2008-05-23 | 2008-05-23 | Radio-frequency signal transceiver and communication system using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810301748XA CN101588187B (en) | 2008-05-23 | 2008-05-23 | Radio-frequency signal transceiver and communication system using same |
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| CN101588187A true CN101588187A (en) | 2009-11-25 |
| CN101588187B CN101588187B (en) | 2013-01-09 |
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| CN200810301748XA Expired - Fee Related CN101588187B (en) | 2008-05-23 | 2008-05-23 | Radio-frequency signal transceiver and communication system using same |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104717021A (en) * | 2013-12-13 | 2015-06-17 | 慧流系统整合股份有限公司 | Distributed antenna system |
| WO2019124833A1 (en) * | 2017-12-22 | 2019-06-27 | 삼성전자 주식회사 | Electronic device for transmitting or receiving wireless signal and method for controlling electronic device |
| CN114039619A (en) * | 2021-09-28 | 2022-02-11 | 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 |
Family Cites Families (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 |
| DE102004047724A1 (en) * | 2003-09-30 | 2005-05-25 | Infineon Technologies Ag | Transmission device for transceiver, has complex multiplication unit to logically combines predistortion coefficient with baseband signals, and power amplifier to compensate for amplitude modulation/phase modulation distortion |
-
2008
- 2008-05-23 CN CN200810301748XA patent/CN101588187B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104717021A (en) * | 2013-12-13 | 2015-06-17 | 慧流系统整合股份有限公司 | Distributed antenna system |
| WO2019124833A1 (en) * | 2017-12-22 | 2019-06-27 | 삼성전자 주식회사 | Electronic device for transmitting or receiving wireless signal and method for controlling electronic device |
| US11159252B2 (en) | 2017-12-22 | 2021-10-26 | Samsung Electronics Co., Ltd. | Electronic device for transmitting or receiving wireless signal and method for controlling electronic device |
| CN114039619A (en) * | 2021-09-28 | 2022-02-11 | 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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