CN103379066A - Base station and method for carrying out predistortion processing based on same - Google Patents
Base station and method for carrying out predistortion processing based on same Download PDFInfo
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- CN103379066A CN103379066A CN201210125587XA CN201210125587A CN103379066A CN 103379066 A CN103379066 A CN 103379066A CN 201210125587X A CN201210125587X A CN 201210125587XA CN 201210125587 A CN201210125587 A CN 201210125587A CN 103379066 A CN103379066 A CN 103379066A
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Abstract
The invention discloses a base station and a method for carrying out predistortion processing based on the base station. The base station comprises a processor, a storage unit and a transmitting chain. The storage unit is used for storing predistortion coefficient tables. The processor is connected with the storage unit and the transmitting chain and used for acquiring needed predistortion coefficients from the predistortion coefficient tables, wherein the predistortion coefficients are used for carrying out the predistortion processing on baseband signals emitted by the transmitting chain. The base station can also comprise a switch coupling module, and the switch coupling module connects the transmitting chain and a receiving chain, and is used for acquiring power amplifier distortion signals at different temperatures in the high temperature aging process of the base station to generate the predistortion coefficient tables. The base station and the method for carrying out the predistortion processing based on the base station solve the technical problem that a base station circuit is complex due to the fact that a single predistortion feedback channel is needed to improve an output linear index, or efficiency is low due to the fact that a high-power power amplifier tube is adopted, and the technical effects of simplifying the structure of the circuit and reducing the power consumption of the circuit are achieved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of base station with carry out the method for pre-distortion based on this base station.
Background technology
At present, femto cell is widely used, and is mainly used in solving the indoor covering of demand, public place and enterprise of outdoor compensation concurrent heating and the problem of the indoor covering of domestic consumer.The base station of femto cell series mainly comprises: Micro (little base station), Pico (femto base station) and Femto (millimicro femto base station), this slightly the rated output power of base station generally all less than 38dBm (6.3W), compare with macro base station, little base station have volume little, lightweight, easily install and the low advantage of cost.
The power output of femto cell is subject to radio-frequency power amplifier tube (Power Amplifier, referred to as PA) the 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 the amplifier nonlinearity characteristic can change along with the variation of temperature, and power tube (abbreviation of power amplifier tube) has become a bottleneck problem that affects row index under the femto cell.In order to save cost and to reduce volume, femto cell does not generally adopt the special-purpose 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.Yet the problem that this mode is brought is most of power that power tube has consumed whole base station, and efficient is very low.For example, the peak power of 3G signal generally is higher than about average 10dB, then the 1dB compression point of power tube need to be than the index request that could satisfy output linearity more than the high 10dB of average power, if need the signal of output 24dbm (250mw), then need to select at least power tube of 34dbm (2W).Yet high-power power tube is expensive, power consumption is large, need to increase independently cooling measure, and improves supply power voltage, does not meet the volume characteristics little, low in energy consumption of femto cell, therefore is difficult to well be used in little base station.
For above-mentioned problem, effective solution is proposed not yet at present.
Summary of the invention
The embodiment of the invention provides a kind of base station and has carried out the method for pre-distortion based on this base station, complicated to solve at least in the prior art base station circuitry that needs independent predistortion feedback path to carry out pre-distortion in order to improve the output linearity index and cause, the technical problem that the efficient that perhaps adopts the high power power tube to bring is lower.
An aspect according to the embodiment of the invention provides a kind of base station, comprising: processor, memory cell and transmitting chain, and wherein, memory cell is used for storage pre-distortion coefficients table; Processor is connected with transmitting chain with memory cell, is used for obtaining the pre-distortion coefficients that needs from the pre-distortion coefficients table, and wherein, pre-distortion coefficients is used for the baseband signal of transmitting chain emission is carried out pre-distortion.
Preferably, the base station also comprises: receiver and switch coupling module, wherein, the switch coupling module, be connected with receiver with transmitting chain, be at the switch coupling module in the situation of the first operating state, the switch coupling module is connected transmitting chain with receiver; Be at the switch coupling module in the situation of the second operating state, the switch coupling module disconnects transmitting chain and is connected connection with receiver; Transmitting chain also is used for emission predistortion training signal, and wherein, the predistortion training signal is the baseband signal that institute's transmitting chain Base Band Unit produces; Receiver, also be used for receiving the power amplification distortion coupled signal through the coupling of switch coupling module, and the power amplification distortion coupled signal carried out down-conversion and digital sample obtains sampled signal, wherein, the power amplification distortion coupled signal is that the predistortion training signal is through the signal behind the power amplifier; Memory cell, the sampled signal that also is used for storage predistortion training signal and the power amplification distortion coupled signal is sampled and obtained, wherein, predistortion training signal and sampled signal are used for generating the pre-distortion coefficients table.
Preferably, the predistortion training signal in the memory cell and sampled signal are used for generating the pre-distortion coefficients table by external equipment, and memory cell is used for the pre-distortion coefficients table that storage obtains from external equipment.
Preferably, external equipment is the treatment facility that is provided with the pre-distortion algorithm routine, and wherein, the pre-distortion algorithms program is used for generating the pre-distortion coefficients table according to predistortion training signal and sampled signal.
Preferably, processor also be used for to be determined current working temperature and the working frequency points of power amplifier, and the pre-distortion coefficients of obtaining needs according to the working temperature of determining and working frequency points from the pre-distortion coefficients table.
According to another aspect of the embodiment of the invention, provide a kind of and carried out the method for pre-distortion based on above-mentioned base station, comprising: the base station obtains the pre-distortion coefficients that needs from the pre-distortion coefficients table of self storage; The base station is carried out pre-distortion according to pre-distortion coefficients to the baseband signal of emission.
Preferably, the base station obtains the pre-distortion coefficients that needs from the pre-distortion coefficients table of self storing, and comprising: current temperature grade and/or current working frequency points are determined in the base station; The base station obtains the pre-distortion coefficients of corresponding current temperature grade and/or current working frequency points from the pre-distortion coefficients table.
Preferably, said method also comprises: the transmitting chain in the base station is launched the predistortion training signal and the predistortion training signal is saved in the memory; Receiver in the base station is sampled to the power amplification distortion coupled signal and is obtained sampled signal, wherein, the power amplification distortion coupled signal is that the predistortion training signal is through being coupled to the signal of receiver by the switch coupling module behind the transmitting chain, wherein, predistortion training signal and sampled signal are used for generating the pre-distortion coefficients table.
Preferably, the transmitting chain in the base station is launched the predistortion training signal and the predistortion training signal is saved in the memory, comprising: the different temperature grade of determining the base station; The base station is being carried out in the process of high temperature ageing, the predistortion training signal is launched in the base station under temperature corresponding to each temperature grade, and predistortion training signal corresponding under each temperature grade is kept in the memory; Receiver in the base station is sampled to the power amplification distortion coupled signal and obtained sampled signal, comprising: receiver is sampled to the power amplification distortion coupled signal and is obtained sampled signal corresponding to each temperature grade, and sampled signal is saved in the memory.
Preferably, the transmitting chain in the base station is launched the predistortion training signal and the predistortion training signal is saved in the memory, comprising: set different working frequency points; The transmitting chain emission is saved in the memory corresponding to the predistortion training signal of each working frequency points and with the predistortion training signal; Receiver in the base station is sampled to the power amplification distortion coupled signal and obtained sampled signal, comprising: receiver is sampled to the power amplification distortion coupled signal and is obtained sampled signal corresponding to each working frequency points, and sampled signal is saved in the memory.
Preferably, after being saved in sampled signal in the memory, also comprise: the base station sends to external equipment with predistortion training signal and sampled signal; The base station receives external equipment according to the pre-distortion coefficients table corresponding to different temperatures grade and/or different operating frequency of predistortion training signal and sampled signal generation.
Preferably, external equipment is according to the pre-distortion coefficients table corresponding to different temperatures grade and/or different operating frequency of predistortion training signal and sampled signal generation, and comprising: external equipment receives predistortion training signal and the sampled signal that the base station sends; External equipment utilizes the pre-distortion algorithms program that self arranges to generate the pre-distortion coefficients table according to predistortion training signal and sampled signal; External equipment sends to the base station with the pre-distortion coefficients table.
Preferably, after the base station received the pre-distortion coefficients table corresponding to different temperatures grade and/or different operating frequency of external equipment according to predistortion training signal and sampled signal generation, also comprise: the base station was detected the pre-distortion coefficients table; When testing result did not satisfy predetermined condition, the base station produced the predistortion training signal again, and power amplification distortion coupled signal corresponding to predistortion training signal sampled, and generated new pre-distortion coefficients table.
In embodiments of the present invention, processor obtains required pre-distortion coefficients from the pre-distortion coefficients table of base station self storage, according to this pre-distortion coefficients baseband signal is carried out pre-distortion, and then obtain the signal of output linearity by the distortion of power amplifier, thereby improved the linear properties of base station.By the way, self stores pre-distortion coefficients the base station, do not need special predistortion feedback channel, thereby reduced the circuit complexity of base station, solved in the prior art, the technical problem of the base station circuitry complexity that needs independent predistortion feedback path to carry out real-time pre-distortion and cause has reached the technique effect of simplifying circuit structure, reducing circuit power consumption.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation according to the base station of the special-purpose predistortion feedback path of existence of correlation technique;
Fig. 2 is the structural representation according to the base station that has the high power tube of 1dB compression point specific power output peak value of correlation technique;
Fig. 3 is a kind of preferred structure block diagram according to the base station of the embodiment of the invention;
Fig. 4 is the another kind of preferred structure block diagram according to the base station of the embodiment of the invention;
Fig. 5 is a kind of preferred flow charts of carrying out pre-distortion according to the baseband signal to the base station of the embodiment of the invention;
Fig. 6 is a kind of preferred flow charts of obtaining the pre-distortion coefficients table according to the embodiment of the invention;
Fig. 7 is a kind of preferred flow charts of the method for sampling according to the signal to the different temperatures grade of the embodiment of the invention;
Fig. 8 is a kind of preferred flow charts of the method for sampling according to the signal to the different operating frequency of the embodiment of the invention;
Fig. 9 is a kind of preferred structure schematic diagram according to the base station of the embodiment of the invention;
Figure 10 is the another kind of preferred flow charts according to the processing method of the baseband signal of the embodiment of the invention;
Figure 11 is a kind of preferred flow charts according to the production procedure of base station on production line of the embodiment of the invention.
Embodiment
Hereinafter also describe in conjunction with the embodiments the present invention in detail with reference to accompanying drawing.Need to prove that in the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Present embodiment provides a kind of base station, and as shown in Figure 3, this base station comprises: processor 302, memory cell 304 and transmitting chain 306, and wherein, memory cell 302 is used for storage pre-distortion coefficients table; Processor 304 is connected with transmitting chain with memory cell 304 and is connected, and is used for obtaining the pre-distortion coefficients that needs from the pre-distortion coefficients table, and wherein, pre-distortion coefficients is used for the baseband signal of transmitting chain emission is carried out pre-distortion.
In this preferred implementation, processor obtains required pre-distortion coefficients from the pre-distortion coefficients table of base station self storage, according to this pre-distortion coefficients baseband signal is carried out the processing of predistortion, thereby improved the linear properties of base station.By the way, base station self stores the pre-distortion coefficients table, do not need special predistortion feedback path, thereby reduced the circuit complexity of base station, it is complicated to have solved in the prior art base station circuitry that needs independent predistortion feedback path to carry out pre-distortion in order to improve the output linearity index and cause, the technical problem that the efficient that perhaps adopts the high power power tube to bring is lower has reached the technique effect of simplifying circuit structure, reducing circuit power consumption.
In a preferred implementation, in order to generate the pre-distortion coefficients table corresponding to this base station, between the transmitting chain of base station and receiver, the switch coupling module is set, as shown in Figure 4, above-mentioned base station also comprises: receiver 402 and switch coupling module 404, wherein, switch coupling module 402, link to each other with receiver 402 with transmitting chain 306, be at switch coupling module 404 in the situation of the first operating state, switch coupling module 402 is connected transmitting chain 306 with receiver 402; That is, be at switch coupling module 404 in the situation of the first operating state, the signal coupling that switch coupling module 402 sends transmitting chain 306 is to receiver 402; Be at switch coupling module 402 in the situation of the second operating state, switch coupling module 402 disconnects the connection that transmitting chain 306 is connected with receiver; Transmitting chain also is used for emission predistortion training signal; Receiver 402 also is used for receiving the power amplification distortion coupled signal by switch coupling module 402, and wherein, the power amplification distortion coupled signal is that the predistortion training signal is through the signal behind the power amplifier; Memory cell 302, the sampled signal that also is used for storage predistortion training signal and the power amplification distortion coupled signal is sampled and obtained, wherein, predistortion training signal and sampled signal are used for generating the pre-distortion coefficients table.
Concrete, above-mentioned switch coupling 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 links to each other with power detection module; The first input end of second switch links to each other with the second output of the first switch; The second input of second switch links to each other with duplexer, and the output of second switch links to each other with receiver.When the input of the first switch links to each other with the second output of the first switch, and the first input end of second switch is when linking to each other with the output of second switch, and the switch coupling module is in the first operating state; When the input of the first switch links to each other with the first output of the first switch, and the second input of second switch is when linking to each other with the output of second switch, and the switch coupling module is in the second operating state.When the switch coupling module is in the first operating state, signal coupling after this switch coupling module amplifies the transmitting chain power amplifier is to receiver, and by receiver signal is sampled, obtaining the pre-distorted signals data corresponding to this base station, thereby generate corresponding pre-distortion coefficients table.Preferably, in order to take full advantage of the process of high temperature ageing, can carry out the base station in the process of high temperature ageing, make the switch coupling module be in the first operating state, to obtain corresponding to predistortion training signal and sampled signal under the different temperatures grade of this base station.
In above-mentioned preferred implementation, by between receiver and transmitting chain, increasing a switch coupling module, this switch coupling module is coupled to receiver with the predistortion training signal of transmitting chain emission, and in this process, store to the base band predistortion training signal of transmitting chain emission with by the corresponding power amplification distortion coupled signal of the predistortion training signal behind the power amplifier sampled signal that obtains of sampling, by external equipment predistortion training signal and sampled signal are processed generation pre-distortion coefficients table, carry out pre-distortion so that self corresponding pre-distortion coefficients table can be called in practical work process in the base station, thereby improved the linear index of base station.
Above-mentioned pre-distortion coefficients table externally generates in the equipment, base station self only needs to provide corresponding predistortion training signal and sampled signal, and (for example send predistortion training signal and sampled signal to external processing apparatus, computer), be set with the pre-distortion algorithm routine in this external equipment, after obtaining predistortion training signal and sampled signal, this external equipment generates pre-distortion coefficients table corresponding to this base station according to predistortion training signal and sampled signal, then this pre-distortion coefficients table is uploaded to this base station, this pre-distortion coefficients table of cell stores in the base station is in order to call when transmitting, and the memory cell in the base station can be flash memory.In a preferred implementation, the predistortion training signal in the memory cell and sampled signal are used for generating the pre-distortion coefficients table by external equipment, and memory cell is used for the pre-distortion coefficients table that storage obtains from external equipment.
In a preferred implementation, external equipment is the treatment facility that is provided with the pre-distortion algorithm routine, and wherein, the pre-distortion algorithms program is used for generating the pre-distortion coefficients table according to predistortion training signal and sampled signal.The base station is in the process of work, may be corresponding different working frequency points, power amplifier also has different temperature grade, therefore, what record in this pre-distortion coefficients table is that the base station is in the pre-distortion coefficients of different temperatures grade, different operating frequency, preferably, can be the corresponding pre-distortion coefficients table of each temperature grade, recording the pre-distortion coefficients of the required employing of different operating frequency under this temperature grade in this pre-distortion coefficients table.In a preferred implementation, processor also be used for to be determined current working temperature and the working frequency points of power amplifier, and the pre-distortion coefficients of obtaining needs according to the working temperature of determining and working frequency points from the pre-distortion coefficients table.
For employed in the above-mentioned base station, term " module " or " unit " they can be to realize the software of predetermined function and/or the combination of hardware, software, hardware, and perhaps the realization of the combination of software and hardware also may and be conceived.
Based on above-mentioned base station, present embodiment also provides a kind of method of carrying out pre-distortion, and as shown in Figure 5, the method comprises the steps:
Step S502: the base station obtains the pre-distortion coefficients that needs from the pre-distortion coefficients table of self storing;
Step S504: the base station is carried out pre-distortion according to pre-distortion coefficients to the baseband signal of emission.
In this preferred implementation, the base station obtains the pre-distortion coefficients table that self stores, from this pre-distortion coefficients table, obtain required pre-distortion coefficients, baseband signal is carried out the processing of predistortion according to this pre-distortion coefficients, and then the output signal of the distortion by power amplifier after improving, thereby improved the linear properties of base station.By the way, self stores pre-distortion coefficients the base station, do not need special predistortion feedback channel, reduced the circuit complexity of base station, it is complicated to have solved in the prior art base station circuitry that needs independent predistortion feedback path to carry out pre-distortion in order to improve the output linearity index and cause, the technical problem that the efficient that perhaps adopts the high power power tube to bring is lower has reached the technique effect of simplifying circuit structure, reducing circuit power consumption.
The base station is in the process of work, can be corresponding different working frequency points, power amplifier also has different temperature grade, therefore, what record in this pre-distortion coefficients table is that the base station is in the pre-distortion coefficients of different temperatures grade, the required sampling of different operating frequency, preferably, can be the corresponding pre-distortion coefficients table of each temperature grade, recording the pre-distortion coefficients of the required employing of different operating frequency under this temperature grade in this pre-distortion coefficients table.When determining to transmit according to the temperature grade of self current working frequency points and/or power amplifier, the base station carries out the required pre-distortion coefficients of predistortion, in a preferred implementation, the base station is from the pre-distortion coefficients table of self storing, obtain the pre-distortion coefficients that needs, comprising: current temperature grade and/or current working frequency points are determined in the base station; The base station from the pre-distortion coefficients table, obtain corresponding current temperature grade and/pre-distortion coefficients of current working frequency points.
In a preferred implementation, provide a kind of base station to obtain the method for its corresponding pre-distortion coefficients table, as shown in Figure 6, the method comprises the steps:
Step S602: the transmitting chain in the base station is launched the predistortion training signal and described predistortion training signal is saved in the memory;
Step S604: the receiver in the base station is sampled to the power amplification distortion coupled signal and is obtained sampled signal;
In step S604, the power amplification distortion coupled signal is the signal that is coupled to receiver behind the predistortion training signal process transmitting chain by the switch coupling module, and wherein, predistortion training signal and sampled signal are used for generating the pre-distortion coefficients table.In the application of reality, receiver needs first this signal to be carried out down-converted at the power amplification distortion coupled signal that receives through the switch coupling module, and the data after the down-conversion are carried out digital sample to obtain sampled signal.
Step S606: the base station sends to external equipment with predistortion training signal and sampled signal;
Step S608: the base station receives external equipment according to the pre-distortion coefficients table corresponding to different temperatures grade and/or different operating frequency of predistortion training signal and sampled signal generation.
Consider that the base station need to know the pre-distortion coefficients of required employing under different operating frequency and/or different temperatures grade, when generating pre-distortion coefficients, can be chosen at the sampled signal of the base station being carried out obtaining in the process of high temperature ageing corresponding generation pre-distortion coefficients, corresponding process at high temperature ageing, normal temperature need to be passed through in the base station, the process of the temperature grade that inferior high temperature is different with high temperature etc., therefore, can be in predistortion training signal and the sampled signal of the Procedure Acquisition base station of high temperature ageing under the different temperatures grade, thus pre-distortion coefficients under the different temperatures grade generated.Also different working frequency points can be set in this process, to obtain the pre-distortion coefficients corresponding to the different operating frequency.
In order to achieve the above object, in a preferred implementation, provide a kind of method that the signal of different temperatures grade is sampled, as shown in Figure 7, the method comprises the steps:
Step S702: the different temperature grade of determining the base station;
Step S704: the base station is being carried out in the process of high temperature ageing, the predistortion training signal is launched in the base station under temperature corresponding to each described temperature grade, and predistortion training signal corresponding under each described temperature grade is kept in the memory;
Step S706: receiver is sampled to the power amplification distortion coupled signal and is obtained sampled signal corresponding to each temperature grade, and sampled signal is saved in the memory.
In another preferred implementation, a kind of method that the signal of different operating frequency is sampled is provided, as shown in Figure 8, the method comprises the steps:
Step S802: set different working frequency points;
Step S804: the transmitting chain emission is saved in the memory corresponding to the predistortion training signal of each working frequency points and with the predistortion training signal;
Step S806: receiver is sampled to the power amplification distortion coupled signal and is obtained sampled signal corresponding to each working frequency points, and sampled signal is saved in the memory.
By preferred embodiment above-mentioned, can obtain the different temperatures grade corresponding to this base station, the pre-distortion coefficients of different operating frequency.Because the high temperature ageing process is a process that temperature raises gradually, therefore, when obtaining sampled signal, can be when arriving corresponding temperature grade, set different working frequency points in this temperature grade, to obtain corresponding to the sampled signal under the different operating frequency of this temperature grade.In each temperature grade, the above-mentioned mode of all sampling just can be obtained each temperature grade corresponding to the sampled signal of different operating frequency.By the way, guaranteed that pre-distortion coefficients corresponding to each working frequency points under each temperature grade and this temperature grade arranged in the pre-distortion coefficients table.
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 that the base station sends; External equipment utilizes the pre-distortion algorithms program that self arranges to generate the pre-distortion coefficients table according to predistortion training signal and sampled signal; External equipment sends to the base station with the pre-distortion coefficients table.
In order to guarantee the validity of pre-distortion coefficients table, after obtaining the pre-distortion coefficients table, can verify the pre-distortion coefficients table, if verify the qualified pre-distortion coefficients table that calls when just this pre-distortion coefficients table being worked as the base station, if detect defective, then re-start sampling and regenerate the pre-distortion coefficients table, in a preferred implementation, after described base station received the pre-distortion coefficients table corresponding to different temperatures grade and/or different operating frequency of described external equipment according to described predistortion training signal and the generation of described sampled signal, the method also comprises: the base station was detected the pre-distortion coefficients table; When testing result did not satisfy predetermined condition, the base station produced the predistortion training signal again, and power amplification distortion coupled signal corresponding to predistortion training signal sampled.
Describe below in conjunction with preferred embodiment, the preferred embodiment combines above-described embodiment and preferred implementation thereof.
Present embodiment provides a kind of femto cell receiving-transmitting chain, as shown in Figure 9, increases the switch coupling module between receive path (namely above receiver) and transmission channel (namely above transmitting chain).Utilize the digital sample function of receive path, the base station is being carried out in the high temperature ageing process, gather the distorted signal of power amplifier under 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 offered femto cell baseband signal is carried out pre-distortion, call the predistortion that the pre-distortion coefficients table carries out baseband signal by CPU (central processing unit) control, improve the linear index of power amplifier output signal.Thereby the linear index that improves base station output, the purpose that improves overall efficiency, reduction cost and volume have been reached.Solved by the way in the prior art hoisting work to bleed off pressure point reduction efficient lower and adopt special-purpose predistortion passage to cause the higher problem of cost, also solved the problem that linear index that femto cell brings owing to the power tube temperature variation characteristic under different temperatures worsens.
Above-mentioned base station is being carried out in the process of high temperature ageing, under different temperatures, by test signal generation module (Test Signal Generate, referred to as TSG) send the downgoing baseband signal, by digital to analog converter (Digital-to-Analog Converter, referred to as DAC) and the digital-to-analogue conversion of intermediate frequency and radio-frequency module settling signal, after modulation and the amplification, utilize the software control module control radio-frequency (RF) switch 1 and 2 (being Switch1 and Switch2 among Fig. 9) between transmitting and receiving, so that the switch coupling module is in the first operating state, thereby the transmitting chain signal is directly coupled to receiver, and set the local oscillator frequency of receiver, the power amplification distortion coupled signal is carried out down-conversion, obtain the sampled signal of zero-frequency after the ADC digital sample is processed, the sampled signal data of TSG baseband source and power amplification distortion coupled signal are stored in the base station flash memory (flash) the most at last.
The data of storing among the flash of base station are downloaded to computer this locality, utilize the pre-distortion algorithms process analysis to process the data message that download the base station, thereby obtain the pre-distortion coefficients table corresponding to this base station, and this pre-distortion coefficients table uploaded be stored among the flash of base station, during for the base station normal operation baseband signal of output is carried out pre-distortion, by the distortion of power amplifier, finally can export the linear signal after improving.
After the high temperature processing, in SEM (spectrum radiation template) and ACPR (Adjacent Channel Power Ratio) index of wireless index test station with the frequency spectrograph testing base station, to enter next station in checking by rear base station, if checking is not passed through, then re-start data acquisition and pre-distortion.
For the clearer explanation embodiment of the invention, the present invention is described further with a specific embodiment for the below.
Present embodiment is with Wideband Code Division Multiple Access (WCDMA) access (the Wideband Code Division Multiple Access of 2.1G frequency range, 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 to add the switch coupling module at hardware during the base station transceiver link design, this switch coupling module connects transmission channel and receive path physically, transmission channel emission TSG training signal, by the software control switch coupling module, to be coupled to receive path by the distorted signal behind the power amplifier, utilize receive path that signal is carried out sampling processing, then sampled signal is downloaded to and carries out the predistortion analyzing and processing in the computer, generate the pre-distortion coefficients table, finally be uploaded in the base station and use.
Carry out idiographic flow that signal processes as shown in figure 10 based on base station shown in Figure 9, comprise the steps:
Step S1002: emission local oscillator and reception local oscillator frequency corresponding to the frequency that transmits are set, (namely above working frequency points) is 2110MHz, for the zero intermediate frequency transceiver, only needing setting to transmit and receive the local oscillator frequency is that 2110MHz gets final product, for the non-zero if transceiver, only need calculate respectively and arrange the local oscillator frequency that transmits and receives corresponding to radio frequency 2110MHz and get final product.
Step S1004: the control figure transmitting chip sends TSG full power signal (24dBm), be the digital pre-distortion training and use signal, this TSG baseband source is saved to flash, preferred, with this baseband source called after TSGBBSourceData.dat.
Step S1006: the radio-frequency (RF) switch 1 and 2 that is emitted to reception is opened in control, makes the power amplifier output signal can be coupled to receive path.When above-mentioned base station circuitry is designed, need at first to guarantee that when pre-distortion the power amplifier coupled signal is undistorted and drop on analog-to-digital converter (Analog-to-Digital Converter after amplifying through receive path, referred to as ADC) sample range in, secondly in the time of need to guaranteeing work in the base station, the signal that transmitting chain is exported can not exert an influence to upper row index.
Present embodiment can guarantee after coupled signal amplifies through receive path in hardware designs undistorted, and falls in the suitable sample range of ADC.To enter the ADC signal as-12dBFs, ADC full scale FS
Adc=0dBm arranges receive path variable gain amplifier (Variable Gain Amplifier is referred to as VGA) gain and makes the receive path gain be G
Rx=4dB is that example describes.Consider that circulator and duplexer Insertion Loss are 3dB, power amplifier output signal power P
PAout=24+3=27dBm considers that the coupler 40dB degree of coupling, two radio-frequency (RF) switch and path loss are 3dB, and therefore total degree of coupling is C
Oup=40+3=43dB then enters ADC mouth power P
Adcin=P
PAout-Coup+G
Rx=27-43+4=-12dBm.Yet, the base station normal operation, need to guarantee when being cut-off switch to transmit to received signal without impact: with Wideband Code Division Multiple Access (WCDMA) access (Wideband Code Division Multiple Access, referred to as WCDMA) base station is the example analysis, heat is made an uproar low-108dBm/3.84MHz, receiving front-end LNA 30dB gain, noise factor 2dB, then enter the thermal noise that transmits and receives the tie point place and be-108dBm+30dB+2dB=-76dBm, make an uproar less than heat and can not affect the reception of base station index more than the low 10dB as long as be leaked to the power at tie point place when satisfying base station full power emission.Radio-frequency (RF) switch 40dB isolation (two radio-frequency (RF) switch are arranged among the design, can guarantee the isolation of 80db), the coupler 40dB degree of coupling, when then working, the isolation that is 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 can not affect the reception index much smaller than-76dBm when therefore working in the base station.
Step S1008:ADC carries out digital sample to the power amplification distortion coupled signal, and the data that sampling is obtained are kept among the flash of base station, and is preferred, is PADistortionData.dat with this numerical nomenclature.
Step S1010: utilize external processing apparatus (can be computer) that digital pre-distortion training signal data PADistortionData.dat and TSGBBSourceData.dat among the flash of base station are downloaded to this locality, utilize the pre-distortion algorithms process analysis to process training signal, thereby 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 among the falsh of base station, call when being operated in the 2110MHz frequency for the base station, preferably, by central processing unit (Central Processing Unit, referred to as CPU) control and call the predistortion that the pre-distortion coefficients table carries out baseband signal, improved the linear index of power amplifier output signal.
Step S1014: after an emission frequency (working frequency points) training is finished, restart and arrange the training process of new working frequency points, for example travel through one time from 2110MHz to 2170MHz with the 1MHz stepping, obtain the pre-distortion coefficients of all frequencies, this table is deposited among the flash of base station, call when being operated in different frequent points under this temperature for the base station.
Step S1016: after all frequencies are finished, switch is set is original default state (namely above the second operating state also is the operating state among Fig. 9), recover the normal operating conditions of base station.
Present embodiment also provides the production procedure of above-mentioned base station on production line, and as shown in figure 11, concrete steps comprise:
Step S1102: the high temperature ageing environment is sent into after the production calibration of production line in the base station, and is preferred, keeps 24 hours high temperature ageing.
Step S1104: at normal temperature, inferior high temperature and hot stage, utilize respectively the sampling of software control base station to obtain the predistortion training signal data of different frequent points, these predistortion training signal data comprise baseband source and power amplification distortion signal (namely above power amplification distortion coupled signal), deposit among the flash of base station.
Step S1106: the base station is through after the high temperature ageing, filter out qualified base station and send into pre-distortion station (also can finish at the wireless index station), predistortion training signal data are downloaded in the computer, carry out the pre-distortion algorithms analyzing and processing, obtain pre-distortion coefficients table that should the base station is uploaded among the flash of base station.Thereby just store normal temperature, inferior high temperature and the high temperature pre-distortion coefficients table under different frequent points in the base station, when different temperatures grade different frequent points is worked, call the distortion of carrying out baseband signal for the base station and process.
Step S1108: utilize frequency spectrograph that base station pre-distortion function is carried out validation test, SEM (spectrum radiation template) and ACPR (Adjacent Channel Power Ratio) index of testing base station when low frequency, intermediate-frequeney point, high frequency points (for example, 2115M, 2140M, 2165MHz) at normal temperatures.
Step S1110: will enter next station in checking by rear base station, and if checking is not passed through, then reprocess the location, and analyze failure cause, and determine whether the base station will be qualified.Preferably, if checking is not passed through, also can re-start data acquisition and pre-distortion.
Preferably, processing procedure among step S1106 and the step S1108 also can be processed at the wireless index station, utilize the computer of wireless index station that sampled signal is processed and obtain the pre-distortion coefficients table and upload this table, also use wireless index station instrument test that index is verified simultaneously.
In above-mentioned each preferred implementation and embodiment, only obtain normal temperature and high-temperature data, be that the radio frequency electric device performance will improve because when low temperature, the RF linear index improves, can do low temperature and adopt number generation pre-distortion coefficients table, call the use of normal temperature pre-distortion coefficients table and get final product.
In the present embodiment, the base station obtains the pre-distortion coefficients table that self stores, from this pre-distortion coefficients table, obtain required pre-distortion coefficients, baseband signal is carried out the processing of predistortion according to this pre-distortion coefficients, then the distortion by power amplifier, can obtain linear output signal, thereby improve the linear properties of base station.By the way, self stores pre-distortion coefficients the base station, do not need special predistortion feedback channel, reduced the circuit complexity of base station, solved in the prior art, the technical problem of the base station circuitry complexity that needs independent predistortion feedback path to carry out real-time pre-distortion and cause has reached the technique effect of simplifying circuit structure, reducing circuit power consumption.
Can be applied to all base stations in the related method of above-mentioned each preferred implementation of the present invention, for example, macro base station, femto cell etc.Especially the effect in femto cell is best.
In another embodiment, also provide a kind of software, this software be used for to be carried out the technical scheme that above-described embodiment and preferred implementation are described.
In another embodiment, also provide a kind of storage medium, stored 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 each module of the present invention or each step can realize with general calculation element, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and be carried out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and 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 modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. a base station is characterized in that, comprising: processor, memory cell and transmitting chain, wherein,
Described memory cell is used for storage pre-distortion coefficients table;
Described processor, with described memory cell be connected transmitting chain and be connected, be used for obtaining the pre-distortion coefficients that needs from described pre-distortion coefficients table, wherein, described pre-distortion coefficients is used for the baseband signal of described transmitting chain emission is carried out pre-distortion.
2. base station according to claim 1 is characterized in that,
Described base station also comprises: receiver and switch coupling module, wherein, described switch coupling module, with described transmitting chain be connected receiver and be connected, be in the situation of the first operating state at described switch coupling module, described switch coupling module is connected described transmitting chain with described receiver; Be in the situation of the second operating state at described switch coupling module, described switch coupling module disconnects described transmitting chain and is connected the connection of receiver;
Described transmitting chain also is used for emission predistortion training signal, and wherein, described predistortion training signal is the baseband signal that institute's transmitting chain Base Band Unit produces; Described receiver, also be used for receiving the power amplification distortion coupled signal through described switch coupling module coupling, and the power amplification distortion coupled signal carried out down-conversion and digital sample obtains sampled signal, wherein, described power amplification distortion coupled signal is that described predistortion training signal is through the signal behind the power amplifier;
Described memory cell, the sampled signal that also is used for storage predistortion training signal and described power amplification distortion coupled signal is sampled and obtained, wherein, described predistortion training signal and described sampled signal are used for generating described pre-distortion coefficients table.
3. base station according to claim 2, it is characterized in that, described predistortion training signal in the described memory cell and described sampled signal are used for generating described pre-distortion coefficients table by external equipment, and described memory cell is used for the described pre-distortion coefficients table that storage obtains from described external equipment.
4. base station according to claim 3, it is characterized in that, described external equipment is the treatment facility that is provided with the 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.
5. base station according to claim 2, it is characterized in that, described processor also be used for to be determined current working temperature and the working frequency points of described power amplifier, and the pre-distortion coefficients of obtaining needs according to the described working temperature of determining and working frequency points from described pre-distortion coefficients table.
6. one kind is carried out the method for pre-distortion based on each described base station of claim 1-5, it is characterized in that, comprising:
The base station obtains the pre-distortion coefficients that needs from the pre-distortion coefficients table of self storing;
Described base station is carried out pre-distortion according to described pre-distortion coefficients to the baseband signal of emission.
7. method according to claim 6 is characterized in that, described base station obtains the pre-distortion coefficients that needs from the pre-distortion coefficients table of self storing, 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.
8. method according to claim 6 is characterized in that, also comprises:
Transmitting chain in the described base station is launched the predistortion training signal and described predistortion training signal is saved in the memory;
Receiver in the described base station is sampled to the power amplification distortion coupled signal and is obtained sampled signal, wherein, described power amplification distortion coupled signal is that described predistortion training signal is through being coupled to the signal of described receiver by the switch coupling module behind the transmitting chain, wherein, described predistortion training signal and described sampled signal are used for generating described pre-distortion coefficients table.
9. method according to claim 8 is characterized in that,
Transmitting chain in the described base station is launched the predistortion training signal and described predistortion training signal is saved in the memory, comprising:
Determine the different temperature grade of described base station;
Described base station is being carried out in the process of high temperature ageing, the predistortion training signal is launched in described base station under temperature corresponding to each described temperature grade, and described predistortion training signal corresponding under each described temperature grade is kept in the described memory;
Receiver in the described base station is sampled to the power amplification distortion coupled signal and is obtained sampled signal, comprising:
Described receiver is sampled to described power amplification distortion coupled signal and is obtained sampled signal corresponding to each described temperature grade, and described sampled signal is saved in the memory.
10. according to claim 8 or 9 described methods, it is characterized in that,
Transmitting chain in the described base station is launched the predistortion training signal and described predistortion training signal is saved in the memory, comprising:
Set different working frequency points;
Described transmitting chain emission is saved in the memory corresponding to the predistortion training signal of each described working frequency points and with described predistortion training signal;
Described receiver is sampled to the power amplification distortion coupled signal and is obtained sampled signal, comprising:
Described receiver is sampled to described power amplification distortion coupled signal corresponding to the predistortion training signal of each described working frequency points and is obtained sampled signal corresponding to each described working frequency points, and described sampled signal is saved in the memory.
11. method according to claim 10 is characterized in that, after being saved in described sampled signal in the memory, also comprises:
Described base station sends to external equipment with described predistortion training signal and described sampled signal;
Described base station receives described external equipment according to the pre-distortion coefficients table corresponding to different temperatures grade and/or different operating frequency of described predistortion training signal and the generation of described sampled signal.
12. method according to claim 11 is characterized in that, described external equipment comprises according to the pre-distortion coefficients table corresponding to different temperatures grade and/or different operating frequency of described predistortion training signal and the generation of described sampled signal:
Described external equipment receives described predistortion training signal and the described sampled signal that described base station sends;
Described external equipment utilizes the pre-distortion algorithms program that self arranges to generate described pre-distortion coefficients table according to described predistortion training signal and described sampled signal;
Described external equipment sends to described base station with described pre-distortion coefficients table.
13. method according to claim 11, it is characterized in that, after described base station receives the pre-distortion coefficients table corresponding to different temperatures grade and/or different operating frequency of described external equipment according to described predistortion training signal and the generation of described sampled signal, also comprise:
Described base station is detected described pre-distortion coefficients table;
When testing result did not satisfy predetermined condition, described base station produced described predistortion training signal again, and power amplification distortion coupled signal corresponding to described predistortion training signal sampled, and generated new pre-distortion coefficients table.
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