CN102724153B - DPD (digital pre-distortion) based far end machine and repeater system - Google Patents
DPD (digital pre-distortion) based far end machine and repeater system Download PDFInfo
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Abstract
The invention discloses a DPD (digital pre-distortion) based far end machine and a repeater system. According to the embodiment of the invention, during the process of the initialization of a far end machine, a DPD unit confirms two carrier signals and feedback I, Q signals from a digital processing unit to obtain regulating parameters; once operating, the far end machine can regulate, compare and the input I, Q signals and the feedback I, Q signals and perform DPD treatment according to the regulating parameters so as to obtain the pre-distortion I, Q signals; the pre-distortion I, Q signals can offset the mutual regulation signals generated in the subsequent signal amplifying process, and the response speed and efficiency of offset treatment are improved; moreover, middle frequency signals collected by a feedback unit are I, Q signals, and the sample bandwidth can be expanded under the condition that the sample speed ratio of analog-to-digital conversion is unchanged for the middle frequency I, Q signals, thus the offset bandwidth of the far end machine is expanded; and the problems in the prior art that the offset treatment response speed of DPD based far end machine is limited and the offset bandwidth is narrow can be solved.
Description
Technical field
The present invention relates to digital RF amplifying technique, particularly, relate to a kind of remote termination and direct discharging station based on digital pre-distortion.
Background technology
Repeater is the important supplement equipment in mobile system Access Network, plays the effect of extending base station range and dead zone-eliminating.As the one of repeater, optical fiber direct amplification stands in the network optimization and is used widely.Optical fiber repeater can be divided into analog optical fiber repeater and digital optical fiber direct station.Wherein, compare analog optical fiber repeater, due to digital optical fiber direct station, to have power output larger, and noise factor is lower, the advantage that transmission range is farther, and in the process of actual networking, digital optical fiber direct station is widely applied.
The system configuration of digital optical fiber direct station has been shown in Fig. 1, and as shown in Figure 1, this system comprises relaying terminal (being called again near-end machine) 101, remote termination 102, between relaying terminal 101 and remote termination 102, is connected by optical fiber 103.On down link, the be coupled radiofrequency signal of base station of relaying terminal 101, go forward side by side after the signal of line correlation is treated as light signal and be transferred to remote termination 102 by optical fiber 103, remote termination 102 carries out a series of processing to this light signal again, after light signal is reduced to radiofrequency signal, go out by antenna transmission, mobile phone terminal receives the radio frequency output signal of this remote termination.In up link, remote termination 102 receives by main, diversity antenna the radiofrequency signal that mobile phone terminal sends, this radiofrequency signal is transferred to relaying terminal 101 by optical fiber 103 after the relevant treatment of remote termination 102 becomes light signal, and relaying terminal 101 carries out after respective handling is reduced to radiofrequency signal being coupled to base station to this light signal again.
At present, at digital optical fiber repeater system in order to ensure the linearity of remote termination output signal, the high Linear Power Amplifier of many employings, and the operating efficiency of high Linear Power Amplifier is not high, and linearity performance boost is limited, for this problem, some digital optical fiber repeater system Applied Digital predistortion (DPD, Digital Pre-Distortion) technology improves the linearity of output signal.For example, in remote termination, process the inter-modulated signal in output signal is offseted by DPD, to improve the linearity of output signal, offset to be by DPD and process the digital baseband signal of input and feedback signal are contrasted, the signal of the single spin-echo of the phase place of signal and inter-modulated signal is defined as to pre-distorted signals, pre-distorted signals is added on input signal, signal after stack can produce inter-modulated signal after power amplifier amplifies, this inter-modulated signal offsets mutually with pre-distorted signals, thereby makes the output signal after amplification have fabulous linear character.
But in the prior art, remote termination normally offsets training and determines pre-distorted signals in running, when excessive the re-starting of amplitude of variation of output signal offsets training later, so just cause certain response time of remote termination needs to offset processing to inter-modulated signal, thus cause remote termination to offset processing response speed slow; And along with the expansion of direct discharging station applied environment, the such as system such as GSM, CDMA, remote termination will offset processing to the signal of multiple types, the bandwidth difference of this multiple types signal, this just requires remote termination should have the wider bandwidth that offsets, and remote termination in currently available technology to offset bandwidth narrower, can not be applicable to the mobile communication system of multiple types.
Visible, in the prior art at present, exist remote termination to offset the problem that processing response speed is slow, offset narrow bandwidth.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of remote termination based on DPD, offset in order to solve the remote termination based on DPD in prior art that processing response speed is slow, the problem that offsets narrow bandwidth one of them.
Accordingly, the embodiment of the present invention also provides a kind of optic-fiber repeater system.
Embodiment of the present invention technical scheme is as follows:
A kind of remote termination based on digital pre-distortion DPD, comprise up radio frequency unit, send to for after the up radiofrequency signal receiving by uplink antenna is converted to light signal the relaying terminal being connected with remote termination, also comprise: digital processing element, DPD unit, downlink radio frequency unit and feedback unit; Digital processing element, in initialized process, export two-way carrier signal to DPD unit, and feedback I, the Q signal of self feed back unit is exported to DPD unit in the future; In system running, to be converted to digital baseband signal from the light signal of relay machine, digital baseband signal is carried out to Digital Up Convert processing and obtain forward direction I, Q signal, forward direction I, Q signal and feedback I, Q signal from feedback unit are exported to DPD unit; DPD unit, in initialized process, contrasts from two-way carrier signal and feedback I, the Q signal of digital processing element and is adjusted parameter; In system running, according to adjusting, forward direction I, Q signal and feedback I, the Q signal of parameter to digital processing element adjusted and contrast obtains reverse mutual tonal signal, and reverse mutual tonal signal is added on forward direction I, Q signal and obtains predistortion I, Q signal; Downlink radio frequency unit, carries out exporting to uplink/downlink antenna after digital-to-analogue conversion, modulation, radio frequency amplification processing for the predistortion I to from DPD unit, Q signal; Feedback unit, for the output signal of the uplink/downlink antenna transmitting that is coupled, and the signal being coupled to is carried out to demodulation, intermediate frequency amplification, analog-to-digital conversion process, and obtain feedback I, Q signal that performance number is consistent with the performance number of forward direction I, Q signal, feedback I, Q signal are exported to digital processing element.
A kind of direct discharging station, comprise the relaying terminal that is connected and the remote termination based on digital pre-distortion DPD, based on the remote termination of DPD, comprise up radio frequency unit, send to for after the up radiofrequency signal receiving by uplink antenna is converted to light signal the relaying terminal being connected with remote termination, the remote termination based on DPD also comprises: digital processing element, DPD unit, downlink radio frequency unit and feedback unit; Digital processing element, in initialized process, export two-way carrier signal to DPD unit, and feedback I, the Q signal of self feed back unit is exported to DPD unit in the future; In system running, to be converted to digital baseband signal from the light signal of relay machine, digital baseband signal is carried out to Digital Up Convert processing and obtain forward direction I, Q signal, forward direction I, Q signal and feedback I, Q signal from feedback unit are exported to DPD unit; DPD unit, in initialized process, contrasts from two-way carrier signal and feedback I, the Q signal of digital processing element and is adjusted parameter; In system running, according to adjusting, forward direction I, Q signal and feedback I, the Q signal of parameter to digital processing element adjusted and contrast obtains reverse mutual tonal signal, and reverse mutual tonal signal is added on forward direction I, Q signal and obtains predistortion I, Q signal; Downlink radio frequency unit, carries out exporting to uplink/downlink antenna after digital-to-analogue conversion, modulation, radio frequency amplification processing for the predistortion I to from DPD unit, Q signal; Feedback unit, for the output signal of the uplink/downlink antenna transmitting that is coupled, and the signal being coupled to is carried out to demodulation, intermediate frequency amplification, analog-to-digital conversion process, and obtain feedback I, Q signal that performance number is consistent with the performance number of forward direction I, Q signal, feedback I, Q signal are exported to digital processing element.
According to the technical scheme of the embodiment of the present invention, in the initialized process of remote termination, sent two-way carrier signal to DPD unit by digital processing element, and the feedback I of self feed back unit in the future, Q signal is exported to DPD unit, DPD unit is to two-way carrier signal and feedback I, Q signal contrasts definite parameter that is adjusted, remote termination just can be according to adjusting the I of parameter to input once operation, Q signal and feedback I, Q signal is adjusted and contrast obtains reverse mutual tonal signal, and by the reverse mutual tonal signal forward direction I that is added to, on Q signal, obtain the I of predistortion, Q signal, predistortion I, Q signal will produce inter-modulated signal in follow-up amplification process, inter-modulated signal and predistortion I, reverse mutual tonal signal in Q signal is cancelled out each other, do not comprised the radiofrequency signal of inter-modulated signal, thereby improve the response speed that offsets processing, improve the efficiency that offsets processing, can solve the remote termination based on DPD in prior art and offset the limited problem of processing response speed.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, or understand by implementing the present invention.Object of the present invention and other advantages can be realized and be obtained by specifically noted structure in write specification, claims and accompanying drawing.
Brief description of the drawings
Fig. 1 is the system configuration schematic diagram of digital optical fiber direct station in prior art;
Fig. 2 is according to the structured flowchart of the direct discharging station of the embodiment of the present invention;
Fig. 3 is according to the structured flowchart of the remote termination based on digital pre-distortion DPD of the embodiment of the present invention;
Fig. 4 is the waveform schematic diagram of the test signal t that sends in initialization procedure according to the remote termination of the embodiment of the present invention;
Fig. 5 is the waveform schematic diagram of the output signal that in initialization procedure, testing signal process obtained according to the remote termination of the embodiment of the present invention;
Fig. 6 is the waveform schematic diagram of inter-modulated signal in Fig. 5;
Fig. 7 is according to the waveform schematic diagram of the remote termination of the embodiment of the present invention definite pre-distorted signals in initialization procedure;
Fig. 8 is the view of the output signal that obtains according to the remote termination processing of the embodiment of the present invention;
The preferred enforcement structural representation of the remote termination that Fig. 9 provides for inventive embodiments.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described, should be appreciated that embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.
In prior art, the remote termination based on DPD offsets the problem that processing response speed is limited, offset narrow bandwidth, and the embodiment of the present invention provides a kind of remote termination and direct discharging station based on DPD, to address this problem.According to the technical scheme of the embodiment of the present invention, in the initialized process of remote termination, sent two-way carrier signal to DPD unit by digital processing element, and the feedback I of self feed back unit in the future, Q signal is exported to DPD unit, DPD unit is to two-way carrier signal and feedback I, Q signal contrasts determines that obtaining predistortion adjusts parameter, remote termination just can be according to adjusting the I of parameter to input once operation, Q signal and feedback I, Q signal is adjusted and contrast obtains reverse mutual tonal signal, and by the reverse mutual tonal signal forward direction I that is added to, on Q signal, obtain the I of predistortion, Q signal, predistortion I, Q signal will produce inter-modulated signal in follow-up amplification process, inter-modulated signal and predistortion I, reverse mutual tonal signal in Q signal is cancelled out each other, do not comprised the radiofrequency signal of inter-modulated signal, thereby improve the response speed that offsets processing, improve the efficiency that offsets processing, and in the optimal technical scheme that the embodiment of the present invention provides, the intermediate-freuqncy signal collecting is I, Q signal, can carry out analog-to-digital sampling rate at intermediate frequency I, Q signal and expand sampling bandwidth constant in the situation that, thereby enlarged distal tip machine offset bandwidth, and then can solve the remote termination based on DPD in prior art and offset the problem that processing response speed is limited, offset narrow bandwidth.
Fig. 2 shows according to the structured flowchart of the direct discharging station of the embodiment of the present invention, and this direct discharging station comprises relaying terminal 21, remote termination 22, and relaying terminal 21 is connected by optical fiber 23 with remote termination 22.On down link, the be coupled radiofrequency signal of base station of relaying terminal 21, this radiofrequency signal is treated to fiber-optic signal, and by optical fiber 23, this fiber-optic signal is sent to remote termination 22, remote termination 22 is processed and is reduced to radiofrequency signal and launches by uplink/downlink antenna the light signal receiving; In up link, the radiofrequency signal that remote termination 22 sends by uplink antenna mobile terminal receive, this radiofrequency signal is converted to light signal, by optical fiber 23, this light signal is sent to relaying terminal 21, relaying terminal 21 is reduced to radiofrequency signal to the light signal processing receiving and is coupled to base station.
In Fig. 3, illustrate according to the structured flowchart of the remote termination based on digital pre-distortion DPD of the embodiment of the present invention, having comprised: digital processing element 31, DPD unit 32, downlink radio frequency unit 33, feedback unit 34 and up radio frequency unit 35; The output of digital processing element 31 is connected to the input of DPD unit 32, the output of DPD unit 32 is connected to the input of downlink radio frequency unit 33, the output of downlink radio frequency unit 33 is connected to uplink/downlink antenna, feedback unit 34 is coupled to the output signal of uplink/downlink antenna, and the output of feedback unit 34 is connected to the input of digital processing element 31.
Digital processing element 31, in initialized process, exports two-way carrier signal to DPD unit 32, and feedback I, the Q signal of self feed back unit 34 are exported to DPD unit in the future; In system running, to be converted to digital baseband signal from the light signal of relay machine, digital baseband signal is carried out to Digital Up Convert processing and obtain forward direction I, Q signal, forward direction I, Q signal and feedback I, Q signal from feedback unit 34 are exported to DPD unit 32;
DPD unit 32, in initialized process, contrasts from two-way carrier signal and feedback I, the Q signal of digital processing element 31 and is adjusted parameter; In system running, forward direction I from digital processing element 31, Q signal and feedback I, Q signal are adjusted and contrast obtains reverse mutual tonal signal according to adjusting parameter, and reverse mutual tonal signal is added on forward direction I, Q signal and obtains predistortion I, Q signal;
Downlink radio frequency unit 33, carries out exporting to uplink/downlink antenna after digital-to-analogue conversion, modulation, radio frequency amplification processing for the predistortion I to from DPD unit 32, Q signal;
Feedback unit 34, for the output signal of the uplink/downlink antenna transmitting that is coupled, and the signal being coupled to is carried out to demodulation, intermediate frequency amplification, analog-to-digital conversion process, and obtain feedback I, Q signal that performance number is consistent with the performance number of forward direction I, Q signal, feedback I, Q signal are exported to digital processing element 31.
Up radio frequency unit 35 sends to the relaying terminal being connected with remote termination after the up radiofrequency signal receiving by uplink antenna is converted to light signal.
The operation principle of remote termination shown in Fig. 3 mainly comprises two parts: in initialization procedure, offset the processing that offsets in training, system running.
(1), in initialization procedure, offset training
In initialization procedure, digital processing element 31 sends two-way carrier signal and (or is called test signal t), the waveform schematic diagram of test signal t has been shown in Fig. 4 to DPD unit 32; The two-way carrier signal receiving is first sent to downlink radio frequency unit 33 by DPD unit 32, the signal that 33DuiDPD unit, downlink radio frequency unit 32 is exported carries out obtaining radio frequency output signal after digital-to-analogue conversion, modulation, radio frequency amplification processing, this output signal is processed and has been produced inter-modulated signal i because radio frequency amplifies, Fig. 5 shows the waveform schematic diagram of output signal, as shown in Figure 5, radio frequency output signal comprises test signal t and inter-modulated signal i, and this radio frequency output signal is sent by uplink/downlink antenna 36; The output signal that feedback unit 34 sends uplink/downlink antenna 36 is coupled, the signal being coupled to is carried out obtaining feeding back I, Q signal after demodulation, intermediate frequency amplification, analog-to-digital conversion process, this feedback I, Q signal comprise test signal t and inter-modulated signal i, and feedback I, Q signal are exported to digital processing element 31; Feedback I, Q signal and two-way carrier signal are exported to DPD unit 32 by digital processing element 31, and DPD unit 32 contrasts two-way carrier signal and feedback I, Q signal and obtain comprising the adjustment parameter of I/Q phase delay, i/q signal loop gain and i/q signal degree of unbalance.
Preferably, DPD unit 32 can also be further according to I/Q phase delay by forward direction I, the phase place of Q signal is adjusted to and is fed back I, the phase place of Q signal is consistent, will feed back I according to i/q signal loop gain and i/q signal difference power, the power of Q signal is adjusted to and forward direction I, Q signal is consistent, the forward direction I after contrast is adjusted, Q signal and feedback I, Q signal obtains feeding back I, Q signal comprises inter-modulated signal i, will spend with inter-modulated signal i phase phasic difference 180, the signal that performance number is identical is defined as reverse mutual tonal signal i ', Fig. 6 shows the waveform schematic diagram of inter-modulated signal i, and further determine and obtain reverse mutual tonal signal i ', Fig. 7 shows the waveform schematic diagram of reverse mutual tonal signal i ', as shown in Figure 7, the phase place of reverse mutual tonal signal i ' is spent with the phase phasic difference 180 of inter-modulated signal, watt level is consistent, and DPD unit 32 is by reverse mutual tonal signal i ' the forward direction I that is added to, on Q signal, obtain predistortion I, Q signal, predistortion I, Q signal will produce inter-modulated signal in follow-up amplification process, inter-modulated signal and predistortion I, reverse mutual tonal signal in Q signal is cancelled out each other, thereby is not comprised the radiofrequency signal of inter-modulated signal, and DPD unit 32 is assessed offseting effect, when in the end output radiofrequency signal reaches predetermined evaluation condition, records above-mentioned adjustment parameter.
(2), in system running, offset processing
On down link, digital processing element 31 receives the light signal from relaying terminal, light signal is converted to digital baseband signal, to digital baseband signal carry out Digital Up Convert, peak clipping processing obtains forward direction I, Q signal, and forward direction I, Q signal are exported to DPD unit 32, DPD unit 32 according to adjustment parameter definite in initialization procedure by forward direction I, Q signal and feedback I, it is consistent that Q signal is adjusted to phase place one power of making peace, particularly, as mentioned above, DPD unit 32 according to I/Q phase delay by forward direction I, the phase place of Q signal is adjusted to and is fed back I, the phase place of Q signal is consistent, to feed back I according to i/q signal loop gain and i/q signal difference power, the power of Q signal is adjusted to and forward direction I, Q signal is consistent, forward direction I after contrast is adjusted, Q signal and feedback I, Q signal obtains feeding back I, Q signal comprises inter-modulated signal i, to spend with inter-modulated signal i phase phasic difference 180, the signal that performance number is identical is defined as reverse mutual tonal signal i ', and by reverse mutual tonal signal i ' the forward direction I that is added to, on Q signal, obtain predistortion I, Q signal, and by predistortion I, Q signal is exported to downlink radio frequency unit 33, downlink radio frequency unit 33 is to the predistortion I receiving, Q signal carries out digital-to-analogue conversion, modulation, radio frequency amplifies to be processed, in this processing procedure, can there is inter-modulated signal in the signal carrying out in radio frequency amplification processing procedure, and predistortion I, reverse mutual tonal signal in Q signal and the single spin-echo of this inter-modulated signal, power is consistent, thereby predistortion I, reverse mutual tonal signal in Q signal and the inter-modulated signal of follow-up generation offset, the output signal that final processing obtains is the signal with linear character, Fig. 8 shows the schematic diagram of the temporal signatures of output signal in system running, as shown in Figure 8, when remote termination is not adopting DPD to process, when inter-modulated signal is offseted, the state of output signal is state 1, after processing by DPD unit 32 according to the remote termination of the embodiment of the present invention, predistortion I, the state of Q signal is state 3, after the signal that 33DuiDPD unit, downlink radio frequency unit 32 is exported amplifies, predistortion I, when Q signal and inter-modulated signal offset, the state of output signal is state 2, it is the infinite linearity that approaches of curve of output, thereby make the inter-modulated signal in final output signal very little, available power is very large.
In said system running, remote termination is in initialized process, by offseting the definite parameter that is adjusted of training, in the process of system works, remote termination just can be according to adjusting the I of parameter to input once operation, Q signal and feedback I, Q signal is adjusted and contrast obtains reverse mutual tonal signal, and by the reverse mutual tonal signal forward direction I that is added to, on Q signal, obtain the I of predistortion, Q signal, predistortion I, Q signal will produce inter-modulated signal in follow-up amplification process, inter-modulated signal and predistortion I, reverse mutual tonal signal in Q signal is cancelled out each other, thereby do not comprised the radiofrequency signal of inter-modulated signal, without looking like prior art in the process of remote termination actual motion, first offset training and obtain pre-distorted signals, and then input signal is offseted to processing, can improve significantly and offset response speed, thereby can solve the remote termination based on DPD in prior art and offset the limited problem of processing response speed.
And, in above-mentioned processing procedure, digital processing element 31, (it is also the cycle that feedback unit 34 feeds back to digital processing element 31 at each measurement period, be called again loop cycle) the forward direction I that obtains of interior statistical disposition, the feedback I that Q signal and feedback unit 34 feed back, power error between Q signal, power error is also the performance number of inter-modulated signal, in the time that power error is all greater than predetermined threshold in the measurement period of continuous predetermined quantity, digital processing element 31 indicates DPD unit 32 to suspend current work, and again send two-way carrier signal and the feedback I from feedback unit 34 to DPD unit 32, Q signal, also re-start and offset training, now DPD unit 32 time-outs offset processing, re-start and offset training, determine and adjust parameter.The embodiment of the present invention is in the concrete process of implementing, can adopt OP6180 chip to realize DPD unit 32, loop cycle is very short, conventionally below millisecond, when occurring forward direction I, when the frequency of Q signal or carrier number change, DPD unit 32 suspends the processing that offsets of a loop cycle, directly output original signal and feedback signal, and re-start and offset training and determine the adjustment parameter of next cycle, now cannot carry out DPD to the inter-modulated signal in output signal and offset processing, but can again recover DPD in next loop cycle and offset processing, the time of whole like this process is below Millisecond, on system output signal to offset impact very little, substantially belong in real time and offset.Known like this, the remote termination that the embodiment of the present invention provides can offset in real time.
Thereby visible, the remote termination that the embodiment of the present invention provides can improve significantly and offsets response speed, can solve the remote termination based on DPD in prior art and offset the limited problem of processing response speed.
On the other hand, the signal that the remote termination that the embodiment of the present invention provides obtains coupling output signal by feedback unit 34 carries out demodulation and obtains intermediate frequency I, Q feedback signal, according to default amplification coefficient to this intermediate frequency I, Q signal carries out intermediate frequency amplification, obtain performance number and forward direction I, the feedback I of the simulation that the performance number of Q signal is consistent, Q signal, and to this analog feedback I, Q signal carries out respectively analog-to-digital conversion, in the concrete process of implementing, modulus conversion chip is sampled to real number signal under normal circumstances, sampling rate must be 2 times of signal bandwidth, to I, this complex signal of Q signal is sampled, only need the sampling rate of 1 times of bandwidth just passable, the remote termination that the embodiment of the present invention provides can adopt 2 modulus conversion chips to be sampled in I road and Q road signal respectively in the concrete process of implementing, so just in the situation that sampling rate is constant, expand sampling bandwidth, digital processing element 31 and DPD unit 32 are based on forward direction I, Q signal and feedback I, Q signal can expand the bandwidth that offsets processing, in prior art, digital processing element 31 and DPD unit 32 are according to forward direction I, Q signal and digital baseband signal offset processing, can in larger bandwidth, offset processing according to remote termination of the present invention, can solve the problem that the remote termination based on DPD in prior art offsets narrow bandwidth.
In addition, in up link, the remote termination that the embodiment of the present invention provides sends to relaying terminal by uplink antenna 37, up radio frequency unit 35 after processing from the radiofrequency signal of mobile terminal, and the operation principle of up link similarly to the prior art, repeats no more here.
The embodiment of the present invention preferably being implemented to structure below describes.
Fig. 9 shows the preferred enforcement structural representation of the remote termination that the embodiment of the present invention provides, as shown in Figure 9, this remote termination comprises: as the digital processing element 31 in Fig. 3, specifically comprise: optical module 901, digital signal processing module 902(specifically realize by fpga chip); As the DPD unit 32 in Fig. 3, specifically comprise: DPD chip 903; As the downlink radio frequency unit 33 in Fig. 3, specifically comprise: digital to analog converter 904, modulator 905, radio frequency amplifier 906, Doherty power amplifier (referred to as Doherty power amplifier) 907; As the feedback unit 34 in Fig. 3, specifically comprise: demodulator 908, intermediate frequency amplifier 909, analog to digital converter 910, this analog to digital converter 910 is specially double-channel analog/digital transducer, and this double-channel analog/digital transducer is equivalent to 2 analog to digital converters; As the up radio frequency unit 35 in Fig. 3, specifically comprise: down conversion module 911, analog to digital converter 912; This remote termination also comprises uplink/downlink antenna 913.
As shown in Figure 9, optical module 901 is connected with fpga chip 902, the output of fpga chip 902 is connected with the input of DPD chip 903, the output of DPD chip 903 is connected with the input of digital to analog converter 904, the output of digital to analog converter 904 is connected with the input of modulator 905, the output of radio frequency amplifier 906 is connected with the input of Doherty power amplifier 907, and the output of Doherty power amplifier 907 is connected with uplink/downlink antenna 916; The input of demodulator 908 is connected with the coupled end that Doherty power amplifier 907 and uplink/downlink antenna 913 are coupled, the output of demodulator 908 is connected with the input of intermediate frequency amplifier 909, the output of intermediate frequency amplifier 909 is connected with the input of analog to digital converter 910, and the output of analog to digital converter 910 is connected with the input of fpga chip 902; Down-converter unit 911 receives up radiofrequency signal, and the output of down-converter unit 911 is connected with the input of analog to digital converter 912, and the output of analog to digital converter 912 is connected with the input of fpga chip 902.
(1), initialization offsets training
Remote termination as shown in Figure 9, in initialized process, fpga chip 902 sends two-way carrier wave GSM signal as training signal to DPD chip, and the carrier spacing of training signal is 600kHZ, and signal magnitude is constant, the two-way carrier signal receiving is first sent to digital to analog converter 904 by DPD chip 903, digital to analog converter 904, modulator 905, Doherty power amplifier 907 carries out digital-to-analogue conversion to two-way carrier signal successively, rf modulations, radio frequency amplifies, power amplification obtains output signal after processing, wherein, digital-to-analogue conversion obtains intermediate-freuqncy signal after processing, every carrier signal size of this intermediate-freuqncy signal is-15dBm, this intermediate-freuqncy signal is through rf modulations, after radio frequency amplification and power amplification, be amplified the radio frequency output signal of performance number, the power of this output signal is 40dBm, visible, adopt Doherty power amplifier efficiently to amplify the power of output signal, exporting output signal to uplink/downlink antenna 913 sends,
The signal that output signal is coupled to, demodulator 908 is modulated and is obtained intermediate frequency I, Q signal this signal being coupled to; Intermediate frequency amplifier 909 carries out intermediate frequency amplification according to default amplification coefficient to this intermediate frequency I, Q signal, obtain feedback I, the Q signal of the roughly the same simulation of the performance number of performance number and two-way carrier signal, analog to digital converter 910 carries out analog-to-digital conversion to feedback I, the Q signal of simulation, obtain respectively digital feedback I, Q signal, feedback I, Q signal are exported to fpga chip 902;
The feedback I receiving, Q signal are exported to DPD chip 903 by fpga chip 902, and DPD chip 903 carries out the definite parameter of adjusting of DPD processing to the two-way carrier wave GSM signal receiving and feedback I, Q signal.
(2), in system works, offset processing
Remote termination as shown in Figure 9, after initialization process finishes, access downlink optical signal, optical module 901 is converted to digital signal to the light signal of access, fpga chip 902 is processed and is obtained digital baseband signal digital signal, this digital baseband signal is carried out to Digital Up Convert and peak clipping processing obtains forward direction I, Q signal, this forward direction I, Q signal and feedback I, Q signal from modulus conversion chip 910 are exported to DPD chip 903, DPD chip 903 is adjusted parameter by forward direction I, Q signal and feedback I, it is consistent that Q signal is adjusted to phase place one power of making peace, particularly, as mentioned above, DPD chip 903 according to I/Q phase delay by forward direction I, the phase place of Q signal is adjusted to and is fed back I, the phase place of Q signal is consistent, to feed back I according to i/q signal loop gain and i/q signal difference power, the power of Q signal is adjusted to and forward direction I, Q signal is consistent, forward direction I after contrast is adjusted, Q signal and feedback I, Q signal obtains feeding back I, Q signal comprises inter-modulated signal i, to spend with inter-modulated signal i phase phasic difference 180, the signal that performance number is identical is defined as reverse mutual tonal signal i ', and by reverse mutual tonal signal i ' the forward direction I that is added to, on Q signal, obtain predistortion I, Q signal, and by predistortion I, Q signal is exported to digital to analog converter 904, digital to analog converter 904, modulator 905, Doherty power amplifier 907 carry out obtaining output signal after digital-to-analogue conversion, rf modulations, radio frequency amplification, power amplification processing to predistortion I, Q signal successively, this output signal can produce inter-modulated signal in power amplification process, the performance number of this inter-modulated signal and reverse mutual tonal signal is roughly the same, single spin-echo, reverse mutual tonal signal just can eliminate inter-modulated signal like this, thereby makes output signal have the linear character as shown in state in Fig. 82.In the process of actual motion, be limited to the sensitivity of device, offseted the adjustment parameter obtaining in training based on initialization by remote termination, signal in actual motion is contrasted and adjusted, the phase difference of the phase place of inter-modulated signal and reverse mutual tonal signal can not be just in time 180 degree, cause still there is a small amount of inter-modulated signal in the final output signal of exporting, but this inter-modulated signal, for the output signal of the system of not processing through DPD, can be ignored substantially.
In remote termination as shown in Figure 9, fpga chip 902 is also added up the power error between forward direction I, Q signal and feedback I, Q signal, in the measurement period of continuous predetermined quantity, when power error is greater than predetermined threshold, instruction DPD chip 903 stops current work, and again send two-way training signal and feed back I, Q signal to DPD chip 903, DPD chip 903 re-starts and offsets training, determines and adjust parameter.As mentioned above, in the concrete process of implementing, measurement period conventionally below millisecond, re-start offset training on system output signal to offset impact very little, substantially belong in real time and offset.And the remote termination shown in Fig. 9 just can offset processing after incoming light signal, and visible, remote termination as shown in Figure 9 can improve the response speed that offsets processing.
Demodulator 908 is demodulated into intermediate frequency I, Q signal to the signal being coupled to, by intermediate frequency amplifier 909, this intermediate frequency I, Q signal are amplified to feedback I, the Q signal of the simulation roughly the same with the performance number size of forward direction I, Q signal, and further by analog to digital converter 910, the feedback I to this simulation, Q signal carry out respectively analog-to-digital conversion, obtain digital feedback I, Q signal, can in the situation that sampling rate is constant, expand sampling bandwidth, thereby make fpga chip 902 and the bandwidth of DPD chip 903 based on wider offset processing.
Down conversion module 911 shown in Fig. 9 in remote termination, the up radiofrequency signal receiving is carried out to down-converted with analog to digital converter 912 and analog-to-digital conversion process obtains digital signal, this digital signal is packaged as CPRI formatted data by fpga chip 902, and these data are sent to optical module 901, this DPRI formatted data is converted to light signal by optical module 901, and this light signal is sent to relaying terminal.
In sum, according to the technical scheme of the embodiment of the present invention, in the initialized process of remote termination, sent two-way carrier signal to DPD unit by digital processing element, and the feedback I of self feed back unit in the future, Q signal is exported to DPD unit, DPD unit is to two-way carrier signal and feedback I, Q signal contrasts determines that obtaining predistortion adjusts parameter, remote termination just can be according to adjusting the I of parameter to input once operation, Q signal and feedback I, Q signal is adjusted and contrast obtains reverse mutual tonal signal, and by the reverse mutual tonal signal forward direction I that is added to, on Q signal, obtain the I of predistortion, Q signal, predistortion I, Q signal will produce inter-modulated signal in follow-up amplification process, inter-modulated signal and predistortion I, reverse mutual tonal signal in Q signal is cancelled out each other, thereby do not comprised the radiofrequency signal of inter-modulated signal, thereby improve the response speed that offsets processing, improve the efficiency that offsets processing, and, in the technical scheme that the embodiment of the present invention provides, feedback unit is I, Q signal to the intermediate-freuqncy signal collecting, feedback unit is sampled to real number signal in prior art to orthogonal I, Q signal sampling, can in the case of the analog-to-digital sampling rate of feedback unit is constant, expand sampling bandwidth, thereby expand the bandwidth that offsets of remote termination, and then can solve the remote termination based on DPD in prior art and offset the problem that processing response speed is limited, offset narrow bandwidth.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if these amendments of the present invention and within modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (14)
1. the remote termination based on digital pre-distortion, comprise up radio frequency unit, send to for after the up radiofrequency signal receiving by uplink antenna is converted to light signal the relaying terminal being connected with described remote termination, it is characterized in that, also comprise: digital processing element, digital pre-distortion DPD unit, downlink radio frequency unit and feedback unit;
Described digital processing element, in initialized process, to described DPD unit output two-way carrier signal, and exports to described DPD unit by the feedback I from described feedback unit, Q signal; In system running, to be converted to digital baseband signal from the light signal of relay machine, described digital baseband signal is carried out to Digital Up Convert processing and obtain forward direction I, Q signal, described forward direction I, Q signal and feedback I, Q signal from described feedback unit are exported to described DPD unit;
Described DPD unit, in initialized process, contrasts and is adjusted parameter from two-way carrier signal and described feedback I, the Q signal of described digital processing element; In system running, according to described adjustment parameter, the forward direction I from described digital processing element, Q signal and feedback I, Q signal are adjusted and contrast obtains reverse mutual tonal signal, and described reverse mutual tonal signal is added on described forward direction I, Q signal and obtains predistortion I, Q signal;
Described downlink radio frequency unit, carries out exporting to uplink/downlink antenna after digital-to-analogue conversion, modulation, radio frequency amplification processing for the described predistortion I to from described DPD unit, Q signal;
Described feedback unit, for the output signal of the described uplink/downlink antenna transmitting that is coupled, and the signal being coupled to is carried out to demodulation, intermediate frequency amplification, analog-to-digital conversion process, obtain feedback I, Q signal that performance number is consistent with the performance number of described forward direction I, Q signal, described feedback I, Q signal are exported to described digital processing element.
2. remote termination according to claim 1, it is characterized in that, described digital processing element, also for: in the process of system operation, when power error in the measurement period of continuous predetermined quantity between described forward direction I, Q signal and described feedback I, Q signal is all greater than predetermined threshold, indicate described DPD unit to stop current work, and again send two-way carrier signal and feedback I, Q signal from described feedback unit to described DPD unit;
Described DPD unit, also for: in the process of system operation, stop current work according to the instruction of described digital processing element, and carry out DPD according to the two-way carrier signal from described digital processing element and described feedback I, Q signal and process and obtain described adjustment parameter.
3. remote termination according to claim 2, is characterized in that, described digital processing element, specifically comprises: optical module and digital signal processing module;
Described optical module, for being converted to digital signal from the light signal of described relaying terminal;
Described digital signal processing module, in initialized process, to described DPD unit output two-way carrier signal, and exports to described DPD unit by described feedback I, Q signal from described feedback unit; In system running, to processing and obtain digital baseband signal from the digital signal of described optical module, described digital baseband signal is carried out to Digital Up Convert processing and obtain forward direction I, Q signal, described forward direction I, Q signal and feedback I, Q signal from described feedback unit are exported to described DPD unit; Also for, in the process of system operation, when power error in the measurement period of continuous predetermined quantity between described forward direction I, Q signal and described feedback I, Q signal is all greater than predetermined threshold, indicate described DPD unit to stop current work, and again send two-way carrier signal and feedback I, Q signal from described feedback unit to described DPD unit.
4. remote termination according to claim 2, is characterized in that, described DPD unit, specifically for:
In initialized process, contrast described two-way carrier signal and described feedback I, Q signal and obtain comprising the adjustment parameter of I/Q phase delay, i/q signal loop gain and i/q signal degree of unbalance;
In system running, according to described I/Q phase delay by described forward direction I, the phase place of Q signal is adjusted to and described feedback I, the phase place of Q signal is consistent, according to described i/q signal loop gain and described i/q signal degree of unbalance by described feedback I, the power of Q signal is adjusted to and described forward direction I, Q signal is consistent, described forward direction I after contrast is adjusted, Q signal and feedback I, Q signal obtains described feedback I, Q signal comprises inter-modulated signal, to spend with described inter-modulated signal phase phasic difference 180, the signal that performance number is identical is defined as reverse mutual tonal signal, and by the described reverse mutual tonal signal described forward direction I that is added to, on Q signal, obtain predistortion I, Q signal,
Also for: in the process of system operation, stop current work according to the instruction of described digital processing element, and carry out DPD according to the two-way carrier signal from described digital processing element and described feedback I, Q signal and process and obtain described adjustment parameter.
5. remote termination according to claim 1, is characterized in that, described feedback unit, specifically comprises: demodulator, intermediate frequency amplifier and analog to digital converter;
Described demodulator, for modulating, obtain intermediate frequency I, Q signal by the signal that described output signal is coupled to;
Described intermediate frequency amplifier, for according to default amplification coefficient, described intermediate frequency I, the Q signal of described demodulator output being carried out to intermediate frequency amplification, obtains feedback I, the Q signal of the simulation that performance number is consistent with the performance number of described forward direction I, Q signal;
Described analog to digital converter, for feedback I, the Q signal of described intermediate frequency amplifier output are carried out to analog-to-digital conversion, obtains respectively described feedback I, the Q signal of numeral, and described feedback I, Q signal are exported to described digital processing element.
6. remote termination according to claim 1, is characterized in that, described downlink radio frequency unit, specifically comprises: digital to analog converter, modulator and radio frequency amplifier;
Described digital to analog converter, obtains for the predistortion I from described DPD unit, Q signal being carried out to digital-to-analogue conversion the intermediate-freuqncy signal of simulating;
Described modulator, for being modulated to radiofrequency signal by the intermediate-freuqncy signal of the simulation from described digital to analog converter;
Described radio frequency amplifier, carries out radio frequency amplification for the radiofrequency signal to from described modulator;
Described downlink radio frequency unit, also comprises: Doherty power amplifier, and for the radiofrequency signal of described radio frequency amplifier output is carried out to power amplification.
7. a direct discharging station, comprise the relaying terminal that is connected and the remote termination based on digital pre-distortion, the described remote termination based on DPD, comprise up radio frequency unit, send to for after the up radiofrequency signal receiving by uplink antenna is converted to light signal the relaying terminal being connected with described remote termination, it is characterized in that, the described remote termination based on DPD also comprises: digital processing element, digital pre-distortion DPD unit, downlink radio frequency unit and feedback unit;
Described digital processing element, in initialized process, to described DPD unit output two-way carrier signal, and exports to described DPD unit by the feedback I from described feedback unit, Q signal; In system running, to be converted to digital baseband signal from the light signal of relay machine, described digital baseband signal is carried out to Digital Up Convert processing and obtain forward direction I, Q signal, described forward direction I, Q signal and feedback I, Q signal from described feedback unit are exported to described DPD unit;
Described DPD unit, in initialized process, contrasts and is adjusted parameter from two-way carrier signal and described feedback I, the Q signal of described digital processing element; In system running, according to described adjustment parameter, the forward direction I from described digital processing element, Q signal and feedback I, Q signal are adjusted and contrast obtains reverse mutual tonal signal, and described reverse mutual tonal signal is added on described forward direction I, Q signal and obtains predistortion I, Q signal;
Described downlink radio frequency unit, carries out exporting to uplink/downlink antenna after digital-to-analogue conversion, modulation, radio frequency amplification processing for the described predistortion I to from described DPD unit, Q signal;
Described feedback unit, for the output signal of the described uplink/downlink antenna transmitting that is coupled, and the signal being coupled to is carried out to demodulation, intermediate frequency amplification, analog-to-digital conversion process, obtain feedback I, Q signal that performance number is consistent with the performance number of described forward direction I, Q signal, described feedback I, Q signal are exported to described digital processing element.
8. direct discharging station according to claim 7, it is characterized in that, described digital processing element, also for: in the process of system operation, when power error in the measurement period of continuous predetermined quantity between described forward direction I, Q signal and described feedback I, Q signal is all greater than predetermined threshold, indicate described DPD unit to stop current work, and again send two-way carrier signal and feedback I, Q signal from described feedback unit to described DPD unit;
Described DPD unit, also for: in the process of system operation, stop current work according to the instruction of described digital processing element, and carry out DPD according to the two-way carrier signal from described digital processing element and described feedback I, Q signal and process and obtain described adjustment parameter.
9. direct discharging station according to claim 8, is characterized in that, described digital processing element, specifically comprises: optical module and digital signal processing module;
Described optical module, for being converted to digital signal from the light signal of described relaying terminal;
Described digital signal processing module, in initialized process, to described DPD unit output two-way carrier signal, and exports to described DPD unit by described feedback I, Q signal from described feedback unit; In system running, to processing and obtain digital baseband signal from the digital signal of described optical module, described digital baseband signal is carried out to Digital Up Convert processing and obtain forward direction I, Q signal, described forward direction I, Q signal and feedback I, Q signal from described feedback unit are exported to described DPD unit; Also for, in the process of system operation, when power error in the measurement period of continuous predetermined quantity between described forward direction I, Q signal and described feedback I, Q signal is all greater than predetermined threshold, indicate described DPD unit to stop current work, and again send two-way carrier signal and feedback I, Q signal from described feedback unit to described DPD unit.
10. direct discharging station according to claim 8, is characterized in that, described DPD unit, specifically for:
In initialized process, contrast described two-way carrier signal and described feedback I, Q signal and obtain comprising the adjustment parameter of I/Q phase delay, i/q signal loop gain and i/q signal difference power;
In system running, according to described I/Q phase delay by described forward direction I, the phase place of Q signal is adjusted to and described feedback I, the phase place of Q signal is consistent, according to described i/q signal loop gain and described i/q signal difference power by described feedback I, the power of Q signal is adjusted to and described forward direction I, Q signal is consistent, described forward direction I after contrast is adjusted, Q signal and feedback I, Q signal obtains described feedback I, Q signal comprises inter-modulated signal, to spend with described inter-modulated signal phase phasic difference 180, the signal that performance number is identical is defined as reverse mutual tonal signal, and by the described reverse mutual tonal signal described forward direction I that is added to, on Q signal, obtain predistortion I, Q signal,
Also for: in the process of system operation, stop current work according to the instruction of described digital processing element, and carry out DPD according to the two-way carrier signal from described digital processing element and described feedback I, Q signal and process and obtain described adjustment parameter.
11. direct discharging stations according to claim 8, is characterized in that, described feedback unit, specifically comprises: demodulator, intermediate frequency amplifier and analog to digital converter;
Described demodulator, for modulating, obtain intermediate frequency I, Q signal by the signal that described output signal is coupled to;
Described intermediate frequency amplifier, for according to default amplification coefficient, described intermediate frequency I, the Q signal of described demodulator output being carried out to intermediate frequency amplification, obtains feedback I, the Q signal of the simulation that performance number is consistent with the performance number of described forward direction I, Q signal;
Described analog to digital converter, for feedback I, the Q signal of described intermediate frequency amplifier output are carried out to analog-to-digital conversion, obtains respectively described feedback I, the Q signal of numeral, and described feedback I, Q signal are exported to described digital processing element.
12. direct discharging stations according to claim 7, is characterized in that, described downlink radio frequency unit, specifically comprises: digital to analog converter, modulator and radio frequency amplifier;
Described digital to analog converter, obtains for the predistortion I from described DPD unit, Q signal being carried out to digital-to-analogue conversion the intermediate-freuqncy signal of simulating;
Described modulator, for being modulated to radiofrequency signal by the intermediate-freuqncy signal of the simulation from described digital to analog converter;
Described radio frequency amplifier, carries out radio frequency amplification for the radiofrequency signal to from described modulator;
Described downlink radio frequency unit, also comprises: Doherty power amplifier, and for the radiofrequency signal of described radio frequency amplifier output is carried out to power amplification.
13. direct discharging stations according to claim 7, is characterized in that, described direct discharging station is CDMA or GSM direct discharging station.
14. direct discharging stations according to claim 13, is characterized in that, if described direct discharging station is CDMA direct discharging station, described direct discharging station is WCDMA or TD-SCDMA direct discharging station.
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| US10505633B2 (en) | 2018-04-30 | 2019-12-10 | Huawei Technologies Co., Ltd. | Method and system for frequency shifted feedback path |
| WO2021174463A1 (en) * | 2020-03-04 | 2021-09-10 | 海能达通信股份有限公司 | Digital predistortion device and transmitter |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1671044A (en) * | 2005-04-29 | 2005-09-21 | 京信通信系统（广州）有限公司 | Method and apparatus for self-adaptive cancellation control of feedforward linear power amplifier optimizing model |
| CN101621304A (en) * | 2009-07-27 | 2010-01-06 | 普天信息技术研究院有限公司 | Transceiver |
| CN101951701A (en) * | 2010-10-19 | 2011-01-19 | 京信通信系统（中国）有限公司 | DPD-based far-end machine and repeater system |
-
2012
- 2012-06-14 CN CN201210196914.0A patent/CN102724153B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1671044A (en) * | 2005-04-29 | 2005-09-21 | 京信通信系统（广州）有限公司 | Method and apparatus for self-adaptive cancellation control of feedforward linear power amplifier optimizing model |
| CN101621304A (en) * | 2009-07-27 | 2010-01-06 | 普天信息技术研究院有限公司 | Transceiver |
| CN101951701A (en) * | 2010-10-19 | 2011-01-19 | 京信通信系统（中国）有限公司 | DPD-based far-end machine and repeater system |
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