CN103379066B - Base station and carry out the method for pre-distortion based on this base station - Google Patents
Base station and carry out the method for pre-distortion based on this base station Download PDFInfo
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Abstract
The invention discloses a kind of base station and carry out the method for pre-distortion based on this base station, wherein, this base station comprises: processor, memory cell and transmitting chain, and wherein, memory cell, for storing pre-distortion coefficients table; Processor, is connected with memory cell and transmitting chain, and for obtaining the pre-distortion coefficients of needs from pre-distortion coefficients table, wherein, the baseband signal that pre-distortion coefficients is used for transmitting chain is launched carries out pre-distortion.This base station can also comprise switch couples module, is connected by transmitting chain with receiver, for obtaining the power amplification distortion signal under different temperatures in the high temperature ageing process of base station, to generate pre-distortion coefficients table.The invention solves the base station circuitry complexity needing independent predistortion feedback path to cause to improve output linearity index, or the technical problem that the efficiency adopting high power power tube to bring is lower, reaches the technique effect simplifying circuit structure, reduce circuit power consumption.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of base station and the method for carrying out pre-distortion based on this base station.
Background technology
At present, femto cell is widely used, and is mainly used in solving the problem of the demand of outdoor compensation concurrent heating, public place and enterprise's in-door covering and domestic consumer's in-door covering.The base station of femto cell series mainly comprises: Micro (micro-base station), Pico (femto base station) and Femto (millimicro femto base station), the rated output power of this base station slightly is generally all less than 38dBm (6.3W), compare with macro base station, micro-base station has little, lightweight, the easy installation of volume and the low advantage of cost.
The power output of femto cell is limited to radio-frequency power amplifier tube (PowerAmplifier, referred to as PA) 1db compression point, the nonlinear characteristic of power amplifier tube has had a strong impact on the lower row index of base station output, and amplifier nonlinearity characteristic can change along with the change of temperature, power tube (abbreviation of power amplifier tube) has become the bottleneck problem affecting row index under femto cell.In order to cost-saving and reduction volume, femto cell does not generally adopt the special predistortion feedback path of similar macro base station as shown in Figure 1 to carry out the improvement of output linearity index, but by selecting the high power tube (HPA) of 1dB compression point specific power output peak value as shown in Figure 2 to promote index.But the problem that this mode is brought is most of power that power tube consumes whole base station, and efficiency is very low.Such as, the peak power of 3G signal is generally higher than about average 10dB, then the 1dB compression point of power tube needs the index request that could meet output linearity than average power more than height 10dB, if need the signal exporting 24dbm (250mw), then need the power tube selecting at least 34dbm (2W).But high-power power tube is expensive, power consumption large, needs to increase independently cooling measure, and improve supply power voltage, do not meet the feature that the volume of femto cell is little, low in energy consumption, be therefore difficult to well be applied on micro-base station.
For above-mentioned problem, at present effective solution is not yet proposed.
Summary of the invention
Embodiments provide a kind of base station and carry out the method for pre-distortion based on this base station, complicated at least to solve the base station circuitry caused to improve output linearity index to need independent predistortion feedback path to carry out pre-distortion in prior art, or the technical problem that the efficiency adopting high power power tube to bring is lower.
According to an aspect of the embodiment of the present invention, provide a kind of base station, comprising: processor, memory cell and transmitting chain, wherein, memory cell, for storing pre-distortion coefficients table; Processor, is connected with memory cell and transmitting chain, and for obtaining the pre-distortion coefficients of needs from pre-distortion coefficients table, wherein, the baseband signal that pre-distortion coefficients is used for transmitting chain is launched carries out pre-distortion.
Preferably, base station also comprises: receiver and switch couples module, wherein, switch couples module, be connected with transmitting chain and receiver, when switch couples module is in the first operating state, transmitting chain is connected with receiver by switch couples module; When switch couples module is in the second operating state, switch couples module disconnects the connection of transmitting chain and receiver; Transmitting chain, also for launching predistortion training signal, wherein, the baseband signal that predistortion training signal produces for institute's transmitting chain Base Band Unit; Receiver, also for receiving the power amplification distortion coupled signal through the coupling of switch couples module, and down-conversion is carried out to power amplification distortion coupled signal and digital sample obtains sampled signal, wherein, power amplification distortion coupled signal is the signal of predistortion training signal after power amplifier; Memory cell, also for storing predistortion training signal and sampling the sampled signal obtained to power amplification distortion coupled signal, wherein, predistortion training signal and sampled signal are for generating pre-distortion coefficients table.
Preferably, the predistortion training signal in memory cell and sampled signal are used for generating pre-distortion coefficients table by external equipment, and memory cell is for storing the pre-distortion coefficients table obtained from external equipment.
Preferably, external equipment is the treatment facility being provided with pre-distortion algorithm routine, and wherein, pre-distortion algorithms program is used for generating pre-distortion coefficients table according to predistortion training signal and sampled signal.
Preferably, processor also for determining the working temperature that power amplifier is current and working frequency points, and obtains the pre-distortion coefficients of needs from pre-distortion coefficients table according to the working temperature determined and working frequency points.
According to another aspect of the embodiment of the present invention, provide a kind of method of carrying out pre-distortion based on above-mentioned base station, comprising: base station, from the pre-distortion coefficients table self stored, obtains the pre-distortion coefficients needed; Base station carries out pre-distortion according to pre-distortion coefficients to the baseband signal of launching.
Preferably, base station, from the pre-distortion coefficients table self stored, obtains the pre-distortion coefficients needed, comprising: current temperature grade and/or current working frequency points are determined in base station; Base station obtains the pre-distortion coefficients of corresponding current temperature grade and/or current working frequency points from pre-distortion coefficients table.
Preferably, said method also comprises: the transmitting chain in base station is launched predistortion training signal and is saved in memory by predistortion training signal; Receiver in base station carries out sampling to power amplification distortion coupled signal and obtains sampled signal, wherein, power amplification distortion coupled signal is predistortion training signal is coupled to receiver after transmitting chain signal by switch couples module, wherein, predistortion training signal and sampled signal are for generating pre-distortion coefficients table.
Preferably, the transmitting chain in base station is launched predistortion training signal and is saved in memory by predistortion training signal, comprising: the different temperature grade determining base station; Carrying out in the process of high temperature ageing to base station, predistortion training signal is launched in base station at the temperature that each temperature grade is corresponding, and is preserved in memory by predistortion training signal corresponding under each temperature grade; Receiver in base station carries out sampling to power amplification distortion coupled signal and obtains sampled signal, comprising: receiver is sampled to power amplification distortion coupled signal and obtained corresponding to the sampled signal of each temperature grade, and sampled signal is saved in memory.
Preferably, the transmitting chain in base station is launched predistortion training signal and is saved in memory by predistortion training signal, comprising: set different working frequency points; Transmitting chain is launched the predistortion training signal corresponding to each working frequency points and is saved in memory by predistortion training signal; Receiver in base station carries out sampling to power amplification distortion coupled signal and obtains sampled signal, comprising: receiver is sampled to power amplification distortion coupled signal and obtained corresponding to the sampled signal of each working frequency points, and sampled signal is saved in memory.
Preferably, after sampled signal is saved in memory, also comprise: predistortion training signal and sampled signal are sent to external equipment by base station; Base station receives the pre-distortion coefficients table corresponding to different temperatures grade and/or different operating frequency that external equipment generates according to predistortion training signal and sampled signal.
Preferably, the pre-distortion coefficients table corresponding to different temperatures grade and/or different operating frequency that external equipment generates according to predistortion training signal and sampled signal, comprising: external equipment receives predistortion training signal and the sampled signal of base station transmission; External equipment according to predistortion training signal and sampled signal, the pre-distortion algorithms Program Generating pre-distortion coefficients table utilizing self to arrange; Pre-distortion coefficients table is sent to base station by external equipment.
Preferably, base station receive that external equipment generates according to predistortion training signal and sampled signal correspond to the pre-distortion coefficients table of different temperatures grade and/or different operating frequency after, also comprise: base station is detected pre-distortion coefficients table; When testing result does not meet predetermined condition, base station produces predistortion training signal again, and the power amplification distortion coupled signal corresponding to predistortion training signal is sampled, and generates new pre-distortion coefficients table.
In embodiments of the present invention, processor obtains required pre-distortion coefficients from the pre-distortion coefficients table that base station self stores, according to this pre-distortion coefficients, pre-distortion is carried out to baseband signal, and then obtained the signal of output linearity by the distortion of power amplifier, thus improve the linear properties of base station.By the way, base station self stores pre-distortion coefficients, do not need special predistortion feedback channel, thus decrease the circuit complexity of base station, solve in prior art, need independent predistortion feedback path to carry out real-time pre-distortion and the technical problem of base station circuitry complexity that causes, reach the technique effect simplifying circuit structure, reduce circuit power consumption.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation that there is the base station of special predistortion feedback path according to correlation technique;
Fig. 2 is the structural representation that there is the base station of the high power tube of 1dB compression point specific power output peak value according to correlation technique;
Fig. 3 is a kind of preferred structure block diagram of the base station according to the embodiment of the present invention;
Fig. 4 is the another kind of preferred structure block diagram of the base station according to the embodiment of the present invention;
Fig. 5 is a kind of preferred flow charts of carrying out pre-distortion according to the baseband signal to base station of the embodiment of the present invention;
Fig. 6 is a kind of preferred flow charts of the acquisition pre-distortion coefficients table according to the embodiment of the present invention;
Fig. 7 is a kind of preferred flow charts to the method that the signal of different temperatures grade is sampled according to the embodiment of the present invention;
Fig. 8 is a kind of preferred flow charts to the method that the signal of different operating frequency is sampled according to the embodiment of the present invention;
Fig. 9 is a kind of preferred structure schematic diagram of the base station according to the embodiment of the present invention;
Figure 10 is the another kind of preferred flow charts of the processing method of baseband signal according to the embodiment of the present invention;
Figure 11 is a kind of preferred flow charts of the base station production procedure on a production line according to the embodiment of the present invention.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Present embodiments provide a kind of base station, as shown in Figure 3, this base station comprises: processor 302, memory cell 304 and transmitting chain 306, and wherein, memory cell 302, for storing pre-distortion coefficients table; Processor 304, is connected with memory cell 304 and transmitting chain 306, and for obtaining the pre-distortion coefficients of needs from pre-distortion coefficients table, wherein, the baseband signal that pre-distortion coefficients is used for transmitting chain is launched carries out pre-distortion.
In the preferred embodiment, processor obtains required pre-distortion coefficients from the pre-distortion coefficients table that base station self stores, and according to this pre-distortion coefficients, baseband signal is carried out to the process of predistortion, thus improves the linear properties of base station.By the way, base station self stores pre-distortion coefficients table, do not need special predistortion feedback path, thus decrease the circuit complexity of base station, solve the base station circuitry caused to improve output linearity index to need independent predistortion feedback path to carry out pre-distortion in prior art complicated, or the technical problem that the efficiency adopting high power power tube to bring is lower, reaches the technique effect simplifying circuit structure, reduce circuit power consumption.
In a preferred embodiment, in order to the pre-distortion coefficients table corresponding to this base station can be generated, between the transmitting chain and receiver of base station, switch couples module is set, as shown in Figure 4, above-mentioned base station also comprises: receiver 402 and switch couples module 404, wherein, switch couples module 402, be connected with receiver 402 with transmitting chain 306, when switch couples module 404 is in the first operating state, transmitting chain 306 is connected with receiver 402 by switch couples module 402; That is, when being in the first operating state in switch couples module 404, the signal coupling that transmitting chain 306 sends by switch couples module 402 is to receiver 402; When switch couples module 402 is in the second operating state, switch couples module 402 disconnects the connection of transmitting chain 306 and receiver 402; Transmitting chain, also for launching predistortion training signal; Receiver 402, also for receiving power amplification distortion coupled signal by switch couples module 402, wherein, power amplification distortion coupled signal is the signal of predistortion training signal after power amplifier; Memory cell 302, also for storing predistortion training signal and sampling the sampled signal obtained to power amplification distortion coupled signal, wherein, predistortion training signal and sampled signal are for generating pre-distortion coefficients table.
Concrete, above-mentioned switch couples module 404 comprises: the first switch and second switch, and wherein, the input of the first switch is connected with transmitting chain by coupler, and the first output of the first switch is connected with power detection module; The first input end of second switch is connected with the second output of the first switch; Second input of second switch is connected with duplexer, and the output of second switch is connected with receiver.When the input of the first switch is connected with the second output of the first switch, and when the first input end of second switch is connected with the output of second switch, switch couples module is in the first operating state; When the input of the first switch is connected with the first output of the first switch, and when the second input of second switch is connected with the output of second switch, switch couples module is in the second operating state.When switch couples module is in the first operating state, this switch couples module by transmitting chain power amplifier amplify after signal coupling to receiver, and by receiver, signal is sampled, to obtain the pre-distorted signals data corresponding to this base station, thus generate corresponding pre-distortion coefficients table.Preferably, in order to make full use of the process of high temperature ageing, can carry out base station in the process of high temperature ageing, make switch couples module be in the first operating state, to obtain corresponding to the predistortion training signal under the different temperatures grade of this base station and sampled signal.
In above-mentioned preferred implementation, by increasing a switch couples module between receiver and transmitting chain, the predistortion training signal that transmitting chain is launched by this switch couples module is coupled to receiver, and the base band predistortion training signal in this process transmitting chain launched and being stored by the sampled signal obtained of sampling of the power amplification distortion coupled signal corresponding to the predistortion training signal after power amplifier, by external equipment, process is carried out to predistortion training signal and sampled signal and generate pre-distortion coefficients table, so that the pre-distortion coefficients table that base station can be called corresponding to self in practical work process carries out pre-distortion, thus improve the linear index of base station.
Above-mentioned pre-distortion coefficients table can generate in external equipment, base station self only needs to provide corresponding predistortion training signal and sampled signal, and send predistortion training signal and sampled signal to external processing apparatus (such as, computer), pre-distortion algorithm routine is set with in this external equipment, after obtaining predistortion training signal and sampled signal, this external equipment generates according to predistortion training signal and sampled signal the pre-distortion coefficients table corresponding to this base station, then this pre-distortion coefficients table is uploaded to this base station, this pre-distortion coefficients table of cell stores in base station is to call when transmitting, memory cell in base station can be flash memory.In a preferred embodiment, the predistortion training signal in memory cell and sampled signal are used for generating pre-distortion coefficients table by external equipment, and memory cell is for storing the pre-distortion coefficients table obtained from external equipment.
In a preferred embodiment, external equipment is the treatment facility being provided with pre-distortion algorithm routine, and wherein, pre-distortion algorithms program is used for generating pre-distortion coefficients table according to predistortion training signal and sampled signal.Base station is in the process of work, different working frequency points may be correspond to, power amplifier also has different temperature grade, therefore, what record in this pre-distortion coefficients table is the pre-distortion coefficients of base station at different temperatures grade, different operating frequency, preferably, can be the corresponding pre-distortion coefficients table of each temperature grade, in this pre-distortion coefficients table, record the required pre-distortion coefficients adopted of different operating frequency under this temperature grade.In a preferred embodiment, processor also for determining the working temperature that power amplifier is current and working frequency points, and obtains the pre-distortion coefficients of needs from pre-distortion coefficients table according to the working temperature determined and working frequency points.
For what use in above-mentioned base station, term " module " or " unit " can be realize the software of predetermined function and/or the combination of hardware, software, hardware, or the realization of the combination of software and hardware also may and conceived.
Based on above-mentioned base station, the present embodiment additionally provides a kind of method of carrying out pre-distortion, and as shown in Figure 5, the method comprises the steps:
Step S502: base station, from the pre-distortion coefficients table self stored, obtains the pre-distortion coefficients needed;
Step S504: base station carries out pre-distortion according to pre-distortion coefficients to the baseband signal of launching.
In the preferred embodiment, base station obtains the pre-distortion coefficients table that self stores, required pre-distortion coefficients is obtained from this pre-distortion coefficients table, according to this pre-distortion coefficients, baseband signal is carried out to the process of predistortion, and then the output signal after being improved by the distortion of power amplifier, thus improve the linear properties of base station.By the way, base station self stores pre-distortion coefficients, do not need special predistortion feedback channel, decrease the circuit complexity of base station, solve the base station circuitry caused to improve output linearity index to need independent predistortion feedback path to carry out pre-distortion in prior art complicated, or the technical problem that the efficiency adopting high power power tube to bring is lower, reaches the technique effect simplifying circuit structure, reduce circuit power consumption.
Base station is in the process of work, different working frequency points can be correspond to, power amplifier also has different temperature grade, therefore, what record in this pre-distortion coefficients table is the pre-distortion coefficients sampled in base station required for different temperatures grade, different operating frequency, preferably, can be the corresponding pre-distortion coefficients table of each temperature grade, in this pre-distortion coefficients table, record the required pre-distortion coefficients adopted of different operating frequency under this temperature grade.The pre-distortion coefficients needed for predistortion is carried out time determination to transmit according to the temperature grade of self current working frequency points and/or power amplifier in base station, in a preferred embodiment, base station is from the pre-distortion coefficients table self stored, obtain the pre-distortion coefficients needed, comprising: current temperature grade and/or current working frequency points are determined in base station; Base station obtains the pre-distortion coefficients of corresponding current temperature grade and/current working frequency points from pre-distortion coefficients table.
In a preferred embodiment, provide a kind of method that base station obtains the pre-distortion coefficients table of its correspondence, as shown in Figure 6, the method comprises the steps:
Step S602: the transmitting chain in base station is launched predistortion training signal and is saved in memory by described predistortion training signal;
Step S604: the receiver in base station carries out sampling to power amplification distortion coupled signal and obtains sampled signal;
In step s 604, power amplification distortion coupled signal is predistortion training signal is coupled to receiver after transmitting chain signal by switch couples module, and wherein, predistortion training signal and sampled signal are for generating pre-distortion coefficients table.In the application of reality, receiver receive through switch couples module power amplification distortion coupled signal need first down-converted is carried out to this signal, the data after down-conversion are carried out digital sample to obtain sampled signal.
Step S606: predistortion training signal and sampled signal are sent to external equipment by base station;
Step S608: base station receives the pre-distortion coefficients table corresponding to different temperatures grade and/or different operating frequency that external equipment generates according to predistortion training signal and sampled signal.
Consider that base station needs to know the required pre-distortion coefficients adopted under different operating frequency and/or different temperatures grade, when generation pre-distortion coefficients, can be chosen at and carry out in the process of high temperature ageing, obtaining the corresponding sampled signal generating pre-distortion coefficients to base station, the corresponding process at high temperature ageing, base station needs through normal temperature, the process of the temperature grade that secondary high temperature and high temperature etc. are different, therefore, can in the predistortion training signal of the Procedure Acquisition base station of high temperature ageing under different temperatures grade and sampled signal, thus the pre-distortion coefficients generated under different temperatures grade.Also different working frequency points can be set in this process, to obtain the pre-distortion coefficients corresponding to different operating frequency.
In order to achieve the above object, in a preferred embodiment, provide a kind of method of sampling to the signal of different temperatures grade, as shown in Figure 7, the method comprises the steps:
Step S702: the different temperature grade determining base station;
Step S704: carrying out in the process of high temperature ageing to base station, predistortion training signal is launched in base station at the temperature that each described temperature grade is corresponding, and predistortion training signal corresponding under each described temperature grade is preserved in memory;
Step S706: receiver is sampled to power amplification distortion coupled signal and obtained corresponding to the sampled signal of each temperature grade, and sampled signal is saved in memory.
In another preferred embodiment, provide a kind of method of sampling to the signal of different operating frequency, as shown in Figure 8, the method comprises the steps:
Step S802: set different working frequency points;
Step S804: transmitting chain is launched the predistortion training signal corresponding to each working frequency points and is saved in memory by predistortion training signal;
Step S806: receiver is sampled to power amplification distortion coupled signal and obtained corresponding to the sampled signal of each working frequency points, and sampled signal is saved in memory.
By preferred embodiment above-mentioned, the pre-distortion coefficients of the different temperatures grade corresponding to this base station, different operating frequency can be obtained.Because high temperature ageing process is the process that a temperature raises gradually, therefore, when acquisition sampled signal, can when arriving corresponding temperature grade, different working frequency points is set, to obtain corresponding to the sampled signal under the different operating frequency of this temperature grade in this temperature grade.In each temperature grade, above-mentioned mode of all sampling, just can obtain the sampled signal that each temperature grade corresponds to different operating frequency.By the way, ensure that in pre-distortion coefficients table the pre-distortion coefficients having each working frequency points under each temperature grade and this temperature grade corresponding.
The pre-distortion coefficients table corresponding to different temperatures grade and/or different operating frequency that external equipment in step S608 generates according to predistortion training signal and sampled signal according to following steps: external equipment receives predistortion training signal and the sampled signal of base station transmission; External equipment according to predistortion training signal and sampled signal, the pre-distortion algorithms Program Generating pre-distortion coefficients table utilizing self to arrange; Pre-distortion coefficients table is sent to base station by external equipment.
In order to ensure the validity of pre-distortion coefficients table, after acquisition pre-distortion coefficients table, can verify pre-distortion coefficients table, if verify qualified just using this pre-distortion coefficients table as the pre-distortion coefficients table called during base station operation, if detect defective, then re-start sampling and regenerate pre-distortion coefficients table, in a preferred embodiment, described base station receive that described external equipment generates according to described predistortion training signal and described sampled signal correspond to the pre-distortion coefficients table of different temperatures grade and/or different operating frequency after, the method also comprises: base station is detected pre-distortion coefficients table, when testing result does not meet predetermined condition, base station produces predistortion training signal again, and the power amplification distortion coupled signal corresponding to predistortion training signal is sampled.
Be described below in conjunction with preferred embodiment, the preferred embodiment combines above-described embodiment and preferred implementation thereof.
Present embodiments provide a kind of femto cell receiving-transmitting chain, as shown in Figure 9, between receive path (namely receiver) above and transmission channel (namely transmitting chain) above, increase switch couples module.Utilize the digital sample function of receive path, carrying out in high temperature ageing process to base station, gather power amplifier distorted signal at different temperatures, algorithm process at wireless index station place in conjunction with computer, generate a pre-distortion coefficients table, and this pre-distortion coefficients table is supplied to femto cell pre-distortion is carried out to baseband signal, controlled to call the predistortion that pre-distortion coefficients table carries out baseband signal by CPU (central processing unit), improve the linear index of power amplifier output signal.Thus reach improve base station export linear index, improve overall efficiency, reduce costs the object with volume.Solve hoisting work in prior art by the way and bleed off pressure the problem that point reduction efficiency is lower and adopt special predistortion passage to cause cost higher, also solve the problem of the linear index deterioration that femto cell brings due to power tube temperature variation characteristic at different temperatures.
Above-mentioned base station is being carried out in the process of high temperature ageing, at different temperatures, by test signal generation module (TestSignalGenerate, referred to as TSG) send downgoing baseband signal, by digital to analog converter (Digital-to-AnalogConverter, referred to as DAC) and the digital-to-analogue conversion of intermediate frequency and radio-frequency module settling signal, modulation and amplify after, utilize the radio-frequency (RF) switch 1 and 2 (i.e. Switch1 and Switch2 in Fig. 9) between software control module control transmitting and receiving, switch couples module is made to be in the first operating state, thus transmitting chain signal is directly coupled to receiver, and set the local oscillator frequency of receiver, down-conversion is carried out to power amplification distortion coupled signal, the sampled signal of zero-frequency is obtained after ADC digital sampling processing, the sampled signal data of TSG baseband source and power amplification distortion coupled signal is stored in base station flash memory (flash) the most at last.
The data stored in the flash of base station are downloaded to computer this locality, utilize the data message that pre-distortion algorithms process analysis process base station is downloaded, thus obtain the pre-distortion coefficients table corresponding to this base station, and this pre-distortion coefficients table is uploaded be stored in the flash of base station, when normally working for base station, pre-distortion is carried out to the baseband signal exported, by the distortion of power amplifier, the linear signal after improving finally can be exported.
After high temperature process, by the SEM (Spectrum Emission Mask) of frequency spectrograph testing base station and ACPR (Adjacent Channel Power Ratio) index in wireless index test station, after being verified, base station will enter next station, if checking is not passed through, then re-start data acquisition and pre-distortion.
In order to the clearer explanation embodiment of the present invention, with a specific embodiment, the present invention is described further below.
The present embodiment is with the Wideband Code Division Multiple Access (WCDMA) of 2.1G frequency range access (WidebandCodeDivisionMultipleAccess, referred to as WCDMA) femto base station (antenna opening power is 24dBm) is example, by reference to the accompanying drawings hardware designs thinking, technical scheme and implementation step is described in detail.
Need during base station transceiver link design on hardware, add switch couples module, this switch couples module connects transmission channel and receive path physically, transmission channel launches TSG training signal, by software control switch coupling module, receive path is coupled to by by the distorted signal after power amplifier, receive path is utilized to carry out sampling processing to signal, then sampled signal is downloaded in computer and carries out predistortion analyzing and processing, generate pre-distortion coefficients table, be finally uploaded in base station and use.
Carry out the idiographic flow of signal transacting as shown in Figure 10 based on the base station shown in Fig. 9, comprise the steps:
Step S1002: the transmitting local oscillator corresponding to the frequency that transmits and reception local oscillator frequency are set, (namely working frequency points) is above 2110MHz, for zero intermediate frequency transceiver, only need arrange transmitting and receiving local oscillator frequency is 2110MHz, for non-zero if transceiver, only need calculate respectively and transmitting and receiving local oscillator frequency corresponding to radio frequency 2110MHz is set.
Step S1004: control figure transmitting chip sends TSG full power signal (24dBm), be digital pre-distortion training and use signal, this TSG baseband source is saved to flash, preferably, by this baseband source called after TSGBBSourceData.dat.
Step S1006: control to open the radio-frequency (RF) switch 1 and 2 being emitted to reception, makes power amplifier output signal and can be coupled to receive path.When designing above-mentioned base station circuitry, first to need to ensure that when pre-distortion power amplifier coupled signal is undistorted and drop on analog-to-digital converter (Analog-to-DigitalConverter after receive path amplifies, referred to as ADC) sample range in, secondly need to ensure when base station normally works, the signal that transmitting chain exports can not have an impact to upper row index.
Present embodiment can ensure in hardware designs that coupled signal is undistorted after receive path amplifies, and falls in the suitable sample range of ADC.Be-12dBFs, ADC full scale FS to enter ADC signal
adc=0dBm, arranges receive path variable gain amplifier (VariableGainAmplifier, referred to as VGA) gain and makes receive path gain be G
rx=4dB is that example is described.Consider that circulator and duplexer Insertion Loss are 3dB, power amplifier output signal power P
pAout=24+3=27dBm, consider that the coupler 40dB degree of coupling, two radio-frequency (RF) switch and path loss are 3dB, therefore total degree of coupling is C
oup=40+3=43dB, then enter ADC mouth power P
adcin=P
pAout-Coup+G
rx=27-43+4=-12dBm.But, base station normally works, namely guarantee is needed to transmit to received signal without impact during cut-off switch: with Wideband Code Division Multiple Access (WCDMA) access (WidebandCodeDivisionMultipleAccess, referred to as WCDMA) base station is example analysis, heat is made an uproar low-108dBm/3.84MHz, receiving front-end LNA 30dB gain, noise factor 2dB, the thermal noise then entering transmitting and receiving tie point place is-108dBm+30dB+2dB=-76dBm, as long as meet the power being leaked to tie point place when base station full power is launched to be less than heat low more than the 10dB that makes an uproar and can not to affect the reception index of base station.Radio-frequency (RF) switch 40dB isolation (have two radio-frequency (RF) switch in the design, can ensure the isolation of 80db), the coupler 40dB degree of coupling, then, when normally working, the isolation being emitted to reception is Isolation=2*40dB+40dB=120dB.Be leaked to the transmit signal power P of receive path
txtoRx=27dBm-120dB=-93dBm ,-93dBm, much smaller than-76dBm, therefore can not affect reception index when base station normally works.
Step S1008:ADC carries out digital sample to power amplification distortion coupled signal, and by sampling, the data obtained are kept in the flash of base station, preferably, are PADistortionData.dat by this numerical nomenclature.
Step S1010: utilize external processing apparatus (can be computer) that the digital pre-distortion training signal data PADistortionData.dat in the flash of base station and TSGBBSourceData.dat is downloaded to this locality, utilize pre-distortion algorithms process analysis process training signal, thus generate the pre-distortion coefficients table corresponding to this base station, this table is saved as DpdCoefTable.dat.
Step S1012: pre-distortion coefficients table DpdCoefTable.dat is uploaded in the falsh of base station, call when 2110MHz frequency for base station operation, preferably, by central processing unit (CentralProcessingUnit, referred to as CPU) control to call the predistortion that pre-distortion coefficients table carries out baseband signal, improve the linear index of power amplifier output signal.
After step S1014: one transmitting frequency (working frequency points) has been trained, restart and the training process of new working frequency points is set, such as travel through one time with 1MHz stepping from 2110MHz to 2170MHz, obtain the pre-distortion coefficients of all frequencies, by this table stored in the flash of base station, call for during base station operation different frequent points at this temperature.
Step S1016: after all frequencies complete, arranging switch is original default state (i.e. the second operating state above is also the operating state in Fig. 9), recovers the normal operating conditions of base station.
The present embodiment additionally provides the production procedure on a production line of above-mentioned base station, and as shown in figure 11, concrete steps comprise:
Step S1102: base station, after the production calibration of production line, is sent into high temperature ageing environment, preferably, kept the high temperature ageing of 24 hours.
Step S1104: at normal temperature, secondary high temperature and hot stage, utilize software control base station to sample respectively and obtain the predistortion training signal data of different frequent points, this predistortion training signal packet containing baseband source and power amplification distortion signal (namely power amplification distortion coupled signal) above, stored in the flash of base station.
Step S1106: base station is after high temperature ageing, filter out eligible base stations and send into pre-distortion station (also can complete at wireless index station), predistortion training signal data are downloaded in computer, carry out pre-distortion algorithms analyzing and processing, obtain, to should the pre-distortion coefficients table of base station, being uploaded in the flash of base station.Thus in base station, just store normal temperature, secondary high temperature and the high temperature pre-distortion coefficients table under different frequent points, call when different temperatures grade different frequent points works the distortion process carrying out baseband signal for base station.
Step S1108: utilize frequency spectrograph to carry out validation test to base station pre-distortion function, the SEM (Spectrum Emission Mask) of testing base station when low frequency, intermediate-frequeney point, high frequency points (such as, 2115M, 2140M, 2165MHz) and ACPR (Adjacent Channel Power Ratio) index at normal temperatures.
Step S1110: base station will enter next station after being verified, if checking is not passed through, then carries out reprocessing location, analyzes failure cause, determines that whether base station is qualified.Preferably, if checking is not passed through, also data acquisition and pre-distortion can be re-started.
Preferably, processing procedure in step S1106 and step S1108 also can process at wireless index station, utilize the computer of wireless index station to carry out process to sampled signal obtain pre-distortion coefficients table and upload this table, also use wireless index station instrument test to verify index simultaneously.
Only normal temperature and high-temperature data is obtained in each preferred implementation above-mentioned and embodiment, be that radio frequency electronics performance will be improved because when low temperature, RF linear index improves, low temperature can be done and adopt number generation pre-distortion coefficients table, call normal temperature pre-distortion coefficients table and use.
In the present embodiment, base station obtains the pre-distortion coefficients table that self stores, required pre-distortion coefficients is obtained from this pre-distortion coefficients table, according to this pre-distortion coefficients, baseband signal is carried out to the process of predistortion, then by the distortion of power amplifier, linear output signal can be obtained, thus improve the linear properties of base station.By the way, base station self stores pre-distortion coefficients, do not need special predistortion feedback channel, decrease the circuit complexity of base station, solve in prior art, need independent predistortion feedback path to carry out real-time pre-distortion and the technical problem of base station circuitry complexity that causes, reach the technique effect simplifying circuit structure, reduce circuit power consumption.
The method stated on the invention involved by each preferred implementation can be applied to all base stations, such as, and macro base station, femto cell etc.Especially the effect in femto cell is best.
In another embodiment, additionally provide a kind of software, this software is for performing the technical scheme described in above-described embodiment and preferred implementation.
In another embodiment, additionally provide a kind of storage medium, store above-mentioned software in this storage medium, this storage medium includes but not limited to: CD, floppy disk, hard disk, scratch pad memory etc.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a base station, is characterized in that, comprising: processor, memory cell and transmitting chain, wherein,
Described memory cell, for storing pre-distortion coefficients table;
Described processor, is connected with described memory cell and described transmitting chain, and for obtaining the pre-distortion coefficients of needs from described pre-distortion coefficients table, wherein, described pre-distortion coefficients is used for carrying out pre-distortion to the baseband signal that described transmitting chain is launched;
Wherein,
Described base station also comprises: receiver and switch couples module, wherein, described switch couples module, be connected with described transmitting chain and described receiver, when described switch couples module is in the first operating state, described transmitting chain is connected with described receiver by described switch couples module; When described switch couples module is in the second operating state, described switch couples module disconnects the connection of described transmitting chain and described receiver;
Described transmitting chain, also for launching predistortion training signal, wherein, the baseband signal that described predistortion training signal produces for institute's transmitting chain Base Band Unit; Described receiver, also for receiving the power amplification distortion coupled signal through described switch couples module coupling, and down-conversion is carried out to power amplification distortion coupled signal and digital sample obtains sampled signal, wherein, described power amplification distortion coupled signal is the signal of described predistortion training signal after power amplifier;
Described memory cell, also for storing predistortion training signal and sampling the sampled signal obtained to described power amplification distortion coupled signal, wherein, described predistortion training signal and described sampled signal are for generating described pre-distortion coefficients table.
2. base station according to claim 1, it is characterized in that, described predistortion training signal in described memory cell and described sampled signal are used for generating described pre-distortion coefficients table by external equipment, and described memory cell is for storing the described pre-distortion coefficients table obtained from described external equipment.
3. base station according to claim 2, it is characterized in that, described external equipment is the treatment facility being provided with pre-distortion algorithm routine, and wherein, described pre-distortion algorithms program is used for generating described pre-distortion coefficients table according to described predistortion training signal and described sampled signal.
4. base station according to claim 1, it is characterized in that, described processor also for determining the working temperature that described power amplifier is current and working frequency points, and obtains the pre-distortion coefficients of needs from described pre-distortion coefficients table according to the described working temperature determined and working frequency points.
5. carry out a method for pre-distortion based on the base station described in any one of claim 1-4, it is characterized in that, comprising:
Base station, from the pre-distortion coefficients table self stored, obtains the pre-distortion coefficients needed;
Described base station carries out pre-distortion according to described pre-distortion coefficients to the baseband signal of launching;
Wherein, the transmitting chain in described base station is launched predistortion training signal and is saved in memory by described predistortion training signal;
Receiver in described base station carries out sampling to power amplification distortion coupled signal and obtains sampled signal, wherein, described power amplification distortion coupled signal is described predistortion training signal is coupled to described receiver after transmitting chain signal by switch couples module, wherein, described predistortion training signal and described sampled signal are for generating described pre-distortion coefficients table.
6. method according to claim 5, is characterized in that, described base station, from the pre-distortion coefficients table self stored, obtains the pre-distortion coefficients needed, comprising:
Current temperature grade and/or current working frequency points are determined in described base station;
Described base station obtains the pre-distortion coefficients of corresponding described current temperature grade and/or described current working frequency points from described pre-distortion coefficients table.
7. method according to claim 5, is characterized in that,
Transmitting chain in described base station is launched predistortion training signal and is saved in memory by described predistortion training signal, comprising:
Determine the different temperature grade of described base station;
Carrying out in the process of high temperature ageing to described base station, predistortion training signal is launched in described base station at the temperature that each described temperature grade is corresponding, and is preserved in which memory by described predistortion training signal corresponding under each described temperature grade;
Receiver in described base station carries out sampling to power amplification distortion coupled signal and obtains sampled signal, comprising:
Described receiver is sampled to described power amplification distortion coupled signal and is obtained corresponding to the sampled signal of each described temperature grade, and described sampled signal is saved in memory.
8. the method according to claim 5 or 7, is characterized in that,
Transmitting chain in described base station is launched predistortion training signal and is saved in memory by described predistortion training signal, comprising:
Set different working frequency points;
Described transmitting chain is launched the predistortion training signal corresponding to each described working frequency points and is saved in memory by described predistortion training signal;
Described receiver carries out sampling to power amplification distortion coupled signal and obtains sampled signal, comprising:
The described power amplification distortion coupled signal that the predistortion training signal of described receiver to each described working frequency points is corresponding is sampled and is obtained corresponding to the sampled signal of each described working frequency points, and described sampled signal is saved in memory.
9. method according to claim 8, is characterized in that, after being saved in memory by described sampled signal, also comprises:
Described predistortion training signal and described sampled signal are sent to external equipment by described base station;
Described base station receives the pre-distortion coefficients table corresponding to different temperatures grade and/or different operating frequency that described external equipment generates according to described predistortion training signal and described sampled signal.
10. method according to claim 9, is characterized in that, the pre-distortion coefficients table corresponding to different temperatures grade and/or different operating frequency that described external equipment generates according to described predistortion training signal and described sampled signal, comprising:
Described external equipment receives the described predistortion training signal of described base station transmission and described sampled signal;
Described external equipment according to described predistortion training signal and described sampled signal, pre-distortion coefficients table described in the pre-distortion algorithms Program Generating utilizing self to arrange;
Described pre-distortion coefficients table is sent to described base station by described external equipment.
11. methods according to claim 9, it is characterized in that, described base station receive that described external equipment generates according to described predistortion training signal and described sampled signal correspond to the pre-distortion coefficients table of different temperatures grade and/or different operating frequency after, also comprise:
Described base station is detected described pre-distortion coefficients table;
When testing result does not meet predetermined condition, described base station produces described predistortion training signal again, and the power amplification distortion coupled signal corresponding to described predistortion training signal is sampled, and generates new pre-distortion coefficients table.
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| CN101217522A (en) * | 2007-12-27 | 2008-07-09 | 华为技术有限公司 | A method and device to determine the predistortion parameter of open loop, commutator and commutating method |
| CN101330481A (en) * | 2007-06-19 | 2008-12-24 | 中兴通讯股份有限公司 | Predistortion model apparatus as well as apparatus, system and method for processing predistortion of signal |
| CN101662435A (en) * | 2009-09-24 | 2010-03-03 | 中兴通讯股份有限公司 | Device and method for obtaining and adjusting digit pre-distortion parameters |
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| CN101330481A (en) * | 2007-06-19 | 2008-12-24 | 中兴通讯股份有限公司 | Predistortion model apparatus as well as apparatus, system and method for processing predistortion of signal |
| CN101217522A (en) * | 2007-12-27 | 2008-07-09 | 华为技术有限公司 | A method and device to determine the predistortion parameter of open loop, commutator and commutating method |
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