CN103650444B

CN103650444B - A kind of discrimination method, device, system and base station

Info

Publication number: CN103650444B
Application number: CN201380000843.5A
Authority: CN
Inventors: 叶四清; 肖宇翔; 李珽; 尤览
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2013-06-28
Filing date: 2013-06-28
Publication date: 2016-03-30
Anticipated expiration: 2033-06-28
Also published as: WO2014205797A1; CN103650444A

Abstract

The embodiment of the invention discloses a kind of discrimination method, comprising: receive the Injection Signal that injection unit produces, using first input signal of described Injection Signal as linear Identification; Receive the second input signal, wherein, described second input signal comprises the linear distortion information of the predistortion inner ring for carrying out pre-distortion to base station downlink signal and the first input signal after the process of described predistortion inner ring; According to described first input signal and described second input signal, calculate linear compensation factors.The embodiment of the invention also discloses a kind of device for identifying, system and base station.Adopt the present invention, good linear Identification and compensation can be carried out to the signal of different bandwidth various in predistortion inner ring, improve the applicability of system, decrease transmitting distortion.

Description

A kind of discrimination method, device, system and base station

Technical field

The present invention relates to communication technical field, particularly relate to a kind of discrimination method, device, system and base station.

Background technology

In a base station, launching distortion is the key factor affecting communication quality.So need to correct transmission channel distortion.Please refer to Fig. 1, is the composition schematic diagram of identification system in prior art.Whole system comprises digital predistortion unit, linear compensation unit, linear Identification unit, transmitter unit, feedback reception unit, decimal time delay and width and to align unit, subtrator and integer delay unit.By digital predistortion unit, linear compensation unit and transmitter unit composition transmission channel, base station downlink signal part input integer delay unit, another part input digital predistortion unit, after pre-distortion, export linear compensation unit to carry out linear compensation, base station downlink signal after linear compensation exports transmitter unit to and is converted to and transmits, the part transmitted exports wireless space to by transmitter unit, a part exports feedback reception unit to, be converted to the first feedback signal by feedback reception unit and export decimal time delay and width to and to align unit, decimal time delay and the width unit that aligns receives from the base station downlink signal of integer delay unit time delay, after the first feedback signal decimal time delay that feedback reception unit is exported, linear Identification unit and subtrator is exported to after aligning with the base station downlink signal width of integer delay unit time delay again, linear Identification unit receives the base station downlink signal after linear compensation, the second feedback signal after aligning according to the base station downlink signal after linear compensation and width calculates linear compensation factors and the linear compensation factors calculated is sent to linear compensation unit, by linear compensation unit, linear compensation is carried out to the base station downlink signal after pre-distortion, subtrator receives the base station downlink signal of integer delay unit time delay, obtain error signal after the second feedback signal after decimal time delay and width being aligned and the base station downlink signal of integer time delay subtract each other and export digital predistortion unit to, digital predistortion unit is according to base station downlink signal and error signal calculation pre-distortion coefficients, complete the digital pre-distortion process to base station downlink signal, thus reduce transmitting distortion.Wherein, loop for carrying out pre-distortion to base station downlink signal is called predistortion inner ring, in FIG, namely can be described as predistortion inner ring by digital predistortion unit, linear compensation unit, transmitter unit, feedback reception unit, decimal time delay and the width loop that unit and subtrator form that aligns.In order to ensure digital predistortion unit convergence and performance, it is very necessary for carrying out linear compensation to predistortion inner ring.Linear compensation can comprise the mutually balanced precompensation of width and homophase and orthogonal (InphaseandQuadrature is called for short IQ) mirror image distortion precompensation.To cause existing the mutually equalizing distorted or IQ mirror image distortion of width if linear compensation effect is poor, when so finally calculating pre-distortion coefficients by produce larger error even algorithm do not restrain Enlarging-Errors or be not tending towards 0.Therefore, the effect of linear compensation is very important.And the effect of linear compensation depends primarily on the calculating of linear compensation factors.

In the prior art, linear compensation factors be according to linear compensation after base station downlink signal, and with the base station downlink signal of integer time delay carry out width align after the second feedback signal calculate.Wherein, width align after the second feedback signal in comprise the linear distortion information of predistortion inner ring.Linear Identification precision due to ring signal in predistortion is relevant with the bandwidth by the signal of predistortion inner ring, when the signal by predistortion inner ring bandwidth more hour, linear Identification precision is lower.And base station downlink signal bandwidth changes with business configuration, a global system for mobile communications (GlobalSystemofMobilecommunication is called for short GSM) carrier wave time the narrowest, may be only had.Now, linear Identification unit cannot carry out effective linear Identification to digital pre-distortion inner ring, then cannot carry out effective linear compensation to digital pre-distortion inner ring, also will affect the calculating of pre-distortion coefficients thus, causes transmitting distortion serious.

Summary of the invention

Embodiments provide a kind of discrimination method, device, system and base station, good linear Identification and compensation can be carried out to the signal of different bandwidth various in predistortion inner ring, improve the applicability of system, decrease transmitting distortion.

Embodiment of the present invention first aspect provides a kind of discrimination method, can comprise:

Receive the Injection Signal that injection unit produces, using first input signal of described Injection Signal as linear Identification;

Receive the second input signal, wherein, described second input signal comprises the linear distortion information of the predistortion inner ring for carrying out pre-distortion to base station downlink signal and the first input signal after the process of described predistortion inner ring;

According to described first input signal and described second input signal, calculate linear compensation factors.

In the implementation that the first is possible, described second input signal is that the first feedback signal is after decimal time delay, the second feedback signal generated after carrying out phase and magnitude registration process with the base station downlink signal of integer time delay, wherein, described first feedback signal is for feedback reception unit is according to the produced signal that transmits of the transmitter unit output received.

In the implementation that the second is possible, described second input signal is that the first feedback signal is after decimal time delay, amplitude and phase alignment process is carried out with the base station downlink signal of integer time delay, subtraction process is carried out again with the base station downlink signal of described integer time delay, the error signal generated after removing the base station downlink signal information of described integer time delay, wherein, described first feedback signal is for feedback reception unit is according to the produced signal that transmits of the transmitter unit output received.

In conjunction with the implementation that first or the second of first aspect are possible, in the implementation that the third is possible, describedly transmit as described transmitter unit is changed and the signal exported according to conjunction road signal, wherein, described conjunction road signal is the signal exported after the described Injection Signal that the base station downlink signal after linear compensation of the linear compensation unit output received and described injection unit produce is added by described adder unit.

In conjunction with first aspect or first or second or the third possible implementation in conjunction with first aspect, in the 4th kind of possible implementation, the band of described Injection Signal is wider than bandwidth threshold K, and described bandwidth threshold K is greater than 0.

Embodiment of the present invention second aspect provides a kind of device for identifying, can comprise:

Receiver module, for receiving the Injection Signal that injection unit produces, using first input signal of described Injection Signal as linear Identification, and receive the second input signal, wherein, described second input signal comprises the linear distortion information of the predistortion inner ring for carrying out pre-distortion to base station downlink signal and the first input signal after the process of described predistortion inner ring;

Computing module, for described first input signal that receives according to described receiver module and described second input signal, calculates linear compensation factors.

In conjunction with the implementation that first or the second of second aspect are possible, in the implementation that the third is possible, describedly transmit as described transmitter unit is changed and the signal exported according to conjunction road signal, wherein, described conjunction road signal is the signal exported after the described Injection Signal that the base station downlink signal after linear compensation of the linear compensation unit output received and described injection unit produce is added by described adder unit.

In conjunction with second aspect or first or second or the third possible implementation in conjunction with second aspect, in the 4th kind of possible implementation, the band of described Injection Signal is wider than bandwidth threshold K, and described bandwidth threshold K is greater than 0.

The embodiment of the present invention third aspect provides a kind of identification system, can comprise:

Linear Identification unit, for receiving Injection Signal, using first input signal of described Injection Signal as linear Identification, and receives the second input signal, according to described first input signal and described second input signal, calculates linear compensation factors; Wherein, described second input signal comprises the linear distortion information of the predistortion inner ring for carrying out pre-distortion to base station downlink signal and the first input signal after the process of described predistortion inner ring;

First linear compensating unit, for receiving the base station downlink signal after pre-distortion, exports after carrying out linear compensation according to the linear compensation factors of described linear Identification unit calculating to the base station downlink signal after described pre-distortion;

Injection unit, for exporting described Injection Signal;

Adder unit, for receiving the base station downlink signal after described Injection Signal and the described first linear compensating unit linear compensation, exports after being added by the base station downlink signal after described Injection Signal and described linear compensation;

Transmitter unit, for receiving the conjunction road signal that described adder unit exports, being converted to described conjunction road signal and transmitting and export;

Feedback reception unit, for receiving transmitting of described transmitter unit output, being converted to the first feedback signal by described transmitting and exporting;

Decimal time delay and width align unit, for the first feedback signal that the base station downlink signal and described feedback reception unit that receive integer time delay export, generate the second feedback signal by after described first feedback signal decimal time delay with the amplitude of the base station downlink signal of described integer time delay and phase alignment and export;

Integer delay unit, for receiving described base station downlink signal, exporting described decimal time delay and width to align unit to described base station downlink signal after carrying out integer delay process;

Subtrator, to align the base station downlink signal of the second feedback signal that unit exports and the integer time delay that described integer delay unit exports for receiving described decimal time delay and width, the base station downlink signal of the integer time delay described second feedback signal and described integer delay unit exported subtracts each other, and the base station downlink signal information removing described integer time delay obtains error signal and exports;

Digital predistortion unit, for receiving the error signal of described subtrator output and described base station downlink signal, calculate pre-distortion coefficients according to described error signal and described base station downlink signal, according to described pre-distortion coefficients pre-distortion carried out to described base station downlink signal and export the described first linear compensating unit to.

In the implementation that the first is possible, described second input signal be described decimal time delay and width align unit export the second feedback signal, or be described subtrator output error signal.

In conjunction with the third aspect or the first the possible implementation in conjunction with the third aspect, in the implementation that the second is possible, described integer delay unit is specifically for carrying out the integer time delay of an integer clock cycle to described base station downlink signal; Described decimal time delay and width align the amplitude of base station downlink signal of integer time delay that unit carries out non-integer clock cycle decimal time delay specifically for the first feedback signal exported described feedback reception unit exports with the first feedback signal making described feedback reception unit export and described integer delay unit and phase alignment.

In conjunction with the third aspect or in conjunction with the possible implementation of first or the second of the third aspect, in the implementation that the third is possible, described system also comprises:

Switch selecting unit, to align the second feedback signal that unit exports for receiving error signal that described subtrator exports and described decimal time delay and width, and selects described error signal or described second feedback signal to export described linear Identification unit to.

In conjunction with the third aspect or first or second or the third possible implementation in conjunction with the third aspect, in the 4th kind of possible implementation, described system also comprises:

Second linear compensation unit, to align the second feedback signal that unit exports for receiving described decimal time delay and width, the linear compensation factors calculated according to described linear Identification unit aligns after the second feedback signal that unit exports carries out linear compensation to described decimal time delay and width and generates the 3rd feedback signal, and exports described subtrator to.

In conjunction with the third aspect or in conjunction with first or second or the 3rd or the 4th kind of possible implementation of the third aspect, in the 5th kind of possible implementation, the described first linear compensating unit and described digital predistortion unit integrate or arrange separately.

Embodiment of the present invention fourth aspect provides a kind of device for identifying, can comprise:

Processor and the memory matched with described processor;

The program that described memory performs for storing described processor;

The Injection Signal that described processor produces for receiving injection unit, using first input signal of described Injection Signal as linear Identification, and receive the second input signal, wherein, described second input signal comprises the linear distortion information of the predistortion inner ring for carrying out pre-distortion to base station downlink signal and the first input signal after the process of described predistortion inner ring; According to described first input signal received and described second input signal, calculate linear compensation factors.

In conjunction with the implementation that first or the second of fourth aspect are possible, in the implementation that the third is possible, describedly transmit as described transmitter unit is changed and the signal exported according to conjunction road signal, wherein, described conjunction road signal is the signal exported after the described Injection Signal that the base station downlink signal after linear compensation of the linear compensation unit output received and described injection unit produce is added by described adder unit.

In conjunction with fourth aspect or first or second or the third possible implementation in conjunction with fourth aspect, in the 4th kind of possible implementation, the band of described Injection Signal is wider than bandwidth threshold K, and described bandwidth threshold K is greater than 0.

The embodiment of the present invention the 5th aspect provides a kind of base station, can comprise:

As the system described in implementation arbitrary in the embodiment of the present invention third aspect or the third aspect.

Implement the embodiment of the present invention, there is following beneficial effect:

By receiving the first input signal and the Injection Signal that can carry out effective linear Identification to system performance, and comprise the second input signal of the linear distortion information of predistortion inner ring and the first input signal after the process of described predistortion inner ring, comparatively accurate linear compensation factors can be obtained through calculating, the signal bandwidth that the effect of linear Identification and compensation and digital predistortion unit are exported has nothing to do, and improves the applicability of system; Achieve and carry out good linear compensation to digital predistortion unit output signal, make digital predistortion unit calculate pre-distortion coefficients time error less, final reduction launches distortion.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the composition schematic diagram of existing identification system;

Fig. 2 is the schematic flow sheet of embodiment of the present invention discrimination method;

Fig. 3 is the composition schematic diagram of device for identifying first embodiment of the present invention;

Fig. 4 is the composition schematic diagram of the first embodiment of identification system of the present invention;

Fig. 5 is the composition schematic diagram of the second embodiment of identification system of the present invention;

Fig. 6 is the composition schematic diagram of the 3rd embodiment of identification system of the present invention;

Fig. 7 is the composition schematic diagram of the 4th embodiment of identification system of the present invention;

Fig. 8 is the composition schematic diagram of device for identifying second embodiment of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

Refer to Fig. 2, be the schematic flow sheet of embodiment of the present invention discrimination method, the method can be applied in the linear Identification unit of identification system, in the present embodiment, said method comprising the steps of:

S201, receives the Injection Signal that injection unit produces, using first input signal of described Injection Signal as linear Identification.

Usually, the bandwidth of its input signal of digital predistortion unit and base station downlink signal is no more than 1/3rd of the maximum output bandwidth of digital predistortion unit.If do linear compensation based on base station downlink signal to predistortion inner ring, because input signal bandwidth changes with BTS service configuration, a GSM carrier wave may be only had time the narrowest, namely 200kHz is only had, now the bandwidth of digital predistortion unit output signal can only be less than or equal to this bandwidth, because bandwidth is narrow, the effective identification to ring property in predistortion cannot be completed.In general, output bandwidth is larger, is more conducive to effective identification of ring property in predistortion.

Particularly, in the present embodiment, the band of described first input signal and Injection Signal is wider than bandwidth threshold K, and wherein, described bandwidth threshold K is greater than 0.According to a large amount of analog simulations and practical operation experience, the value of threshold k can be configured to 0.8fs or more herein, wherein, fs is the sample rate of digital predistortion unit by signal, when the bandwidth numerical value of Injection Signal is greater than 0.8fs, described Injection Signal can be called broadband signal, is beneficial to linear Identification and follow-up linear compensation.Certainly, also can carry out linear Identification to the characteristic of predistortion inner ring when K is less than 0.8fs, but no matter be that identification efficiency and identification precision all significantly reduce.

More specifically, the amplitude of described Injection Signal is less, its amplitude size the performance of transmitter unit output and the amplitude size of transmitter unit circuit noise close, namely both differences are in a preset range, and even the amplitude of Injection Signal is less than the amplitude size of transmitter unit circuit noise.Like this, the Injection Signal of reception can be ignored substantially to the interference that base station downlink signal causes.There is no base station downlink signal in digital predistortion unit, owing to there is not the interference problem to base station downlink signal, therefore suitably can improve the amplitude that Injection Signal exports.

S202, receives the second input signal.

Wherein, described second input signal comprises the linear distortion information of the predistortion inner ring for carrying out pre-distortion to base station downlink signal and the first input signal after the process of described predistortion inner ring.

In the present embodiment, the linear distortion information of predistortion inner ring and the first input signal after the process of described predistortion inner ring is comprised in described second input signal.Described first input signal is not only for the reference signal as linear Identification, also can be added with the base station downlink signal after digital pre-distortion process and linear compensation simultaneously and export described transmitter unit to and through the process of predistortion inner ring, therefore, the linear distortion information of predistortion inner ring and the first input signal after the process of described predistortion inner ring will be comprised in described second input signal.

S203, according to described first input signal and described second input signal, calculates linear compensation factors.

When that is the first input signal is broadband signal to described Injection Signal, effective linear Identification can be carried out to ring property in predistortion, obtain comparatively accurate linear compensation factors thus good linear compensation is carried out to digital predistortion unit output signal, digital predistortion unit is made to calculate pre-distortion coefficients time error less, distortion is launched in final reduction, because add Injection Signal, so the signal bandwidth that the effect of linear Identification and compensation and digital predistortion unit input has nothing to do, improve the applicability of system.

Wherein, described second input signal can be the first feedback signal after decimal time delay, the second feedback signal generated after carrying out phase and magnitude registration process with the base station downlink signal of integer time delay.

The produced signal that transmits that described first feedback signal exports according to the transmitter unit received for feedback reception unit.Describedly transmit as described transmitter unit is changed and the signal exported according to conjunction road signal.Described conjunction road signal is the described Injection Signal that the base station downlink signal after linear compensation of the linear compensation unit output received and described injection unit produce by described adder unit, is also the signal of the first input signal, output after being added.

Preferably, described second input signal signal is that the first feedback signal is after decimal time delay, amplitude and phase alignment process is carried out with the base station downlink signal of integer time delay, subtraction process is carried out again, the error signal generated after removing the base station downlink signal information of described integer time delay with the base station downlink signal of described integer time delay.Described integer time delay specifically represents time delay base station downlink signal being carried out to an integer clock cycle; Described decimal time delay specifically represents that decimal time delay that the first feedback signal exported described feedback reception unit carries out a non-integer clock cycle is with the amplitude of the base station downlink signal of the first feedback signal making described feedback reception unit export and integer time delay and phase alignment.

Because described second feedback signal derives from base station downlink signal, so comprise the information of a large amount of base station downlink signal in described second feedback signal.And the amplitude of described Injection Signal is general less, therefore described in described second feedback signal, the amplitude of Injection Signal is less equally, also less relative to the ratio of base station downlink signal and circuit noise, need the correlation accumulation of long period to promote the ratio of described Injection Signal relative to base station downlink signal and circuit noise when carrying out linear Identification.The amplitude of usual base station downlink signal is much larger than circuit noise.

Described second feedback signal, because have passed through a series of process, has a timing difference with described base station downlink signal.If can remove the information of the described base station downlink signal comprised in described second feedback signal of reception, the correlation accumulation time of so described Injection Signal will shorten greatly.And removed about the content of base station downlink signal in the error signal adopting subtraction process to obtain, therefore can obtain the correlation accumulation time of desirable Injection Signal.

Certainly, when transmission channel starts, input owing to there is no base station downlink signal, therefore the large Injection Signal of amplitude can be received to obtain linear compensation factors, the correlation accumulation time can be shortened equally, at this moment can directly with second input signal of feedback signal as linear Identification not removing base station downlink signal information.

Referring to Fig. 3, is the composition schematic diagram of device for identifying first embodiment of the present invention.In the present embodiment, described device comprises: receiver module 100 and computing module 200.

The Injection Signal that described receiver module 100 produces for receiving injection unit, using first input signal of described Injection Signal as linear Identification, and receive the second input signal, wherein, described second input signal comprises the linear distortion information of the predistortion inner ring for carrying out pre-distortion to base station downlink signal and the first input signal after the process of described predistortion inner ring;

Particularly, in the present embodiment, the band of described first input signal and Injection Signal is wider than bandwidth threshold K, and described bandwidth threshold K is greater than 0, according to a large amount of analog simulations and practical operation experience, the value of threshold k can be configured to 0.8fs or more herein, wherein, fs is the sample rate of digital predistortion unit by signal, when the bandwidth numerical value of Injection Signal is greater than 0.8fs, described Injection Signal can be called broadband signal, is beneficial to linear Identification and follow-up linear compensation.Certainly, also can carry out linear Identification to the characteristic of predistortion inner ring when K is less than 0.8fs, but no matter be that identification efficiency and identification precision all significantly reduce.

Described computing module 200, for described first input signal that receives according to described receiver module and described second input signal, calculates linear compensation factors.

Certainly, when transmission channel starts, owing to not having base station downlink signal to input, therefore can receive the large Injection Signal of amplitude to obtain linear compensation factors, the correlation accumulation time can be shortened equally.At this moment can directly with second input signal of feedback signal as linear Identification not removing base station downlink signal information.

Referring to Fig. 4, is the composition schematic diagram of the first embodiment of identification system of the present invention.In the present embodiment, described system comprises: the linear compensating unit 2 of linear Identification unit 1, first, injection unit 3, adder unit 4, transmitter unit 5, feedback reception unit 6, decimal time delay and width align unit 7, integer delay unit 8, subtrator 9, digital predistortion unit 10.

Described linear Identification unit 1, for receiving Injection Signal, using first input signal of described Injection Signal as linear Identification, and receives the second input signal, according to described first input signal and described second input signal, calculates linear compensation factors; Wherein, described second input signal comprises the linear distortion information of the predistortion inner ring for carrying out pre-distortion to base station downlink signal and the first input signal after the process of described predistortion inner ring;

Described first linear compensating unit 2, for receiving the base station downlink signal after pre-distortion, exports after carrying out linear compensation according to the linear compensation factors of described linear Identification unit 1 calculating to the base station downlink signal after described pre-distortion;

Described injection unit 3 is for exporting described Injection Signal;

Described adder unit 4, for receiving the base station downlink signal after described Injection Signal and the described first linear compensating unit linear compensation, exports after being added by the base station downlink signal after described Injection Signal and described linear compensation;

The conjunction road signal that described transmitter unit 5 exports for receiving described adder unit 4, is converted to described conjunction road signal and transmits and export;

Described transmitting, for receiving transmitting of described transmitter unit 5 output, is converted to the first feedback signal and exports by described feedback reception unit 6;

Described decimal time delay and width align the first feedback signal that unit 7 exports for receiving the base station downlink signal of integer time delay and described feedback reception unit 6, generate the second feedback signal by after described first feedback signal decimal time delay and export with the amplitude of the base station downlink signal of described integer time delay and phase alignment;

Described integer delay unit 8, for receiving described base station downlink signal, exports described decimal time delay and width to align unit 7 to described base station downlink signal after carrying out integer delay process;

Described subtrator 9 to align the base station downlink signal of the second feedback signal that unit 7 exports and the integer time delay that described integer delay unit 8 exports for receiving described decimal time delay and width, the base station downlink signal of the integer time delay described second feedback signal and described integer delay unit 8 exported subtracts each other, and the base station downlink signal information removing described integer time delay obtains error signal and exports;

Described digital predistortion unit 10 is for receiving the error signal of described subtrator 9 output and described base station downlink signal, calculate pre-distortion coefficients according to described error signal and described base station downlink signal, according to described pre-distortion coefficients pre-distortion carried out to described base station downlink signal and export the described first linear compensating unit 2 to.

Described integer delay unit 8 is specifically for carrying out the integer time delay of an integer clock cycle to described base station downlink signal; Described decimal time delay and width align the amplitude of base station downlink signal of integer time delay that unit 7 carries out non-integer clock cycle decimal time delay specifically for the first feedback signal exported described feedback reception unit exports with the first feedback signal making described feedback reception unit 6 and export and described integer delay unit 8 and phase alignment.

In the present embodiment, by configuration injection unit and adder unit, utilize Injection Signal as the first input signal of linear Identification, utilize the second feedback signal as the second input signal of linear Identification, and in the second feedback signal, comprise the linear distortion information of the first input signal and Injection Signal and predistortion inner ring simultaneously, thus calculate linear compensation factors accurately, improve the effect of linear compensation, reduce error when calculating pre-distortion coefficients, eventually reduce transmitting distortion.

Certainly, in the present embodiment, the signal be added in described adder unit 4 also can be the base station downlink signal before the described first linear compensating unit 3 linear compensation, namely first injects described Injection Signal, then carries out linear compensation to the signal after being added.Specific algorithm is slightly different, and the effect of linear Identification is similar.

Referring to Fig. 5, is the composition schematic diagram of the second embodiment of identification system of the present invention.In the present embodiment, described system comprises: the linear compensating unit 2 of linear Identification unit 1, first, injection unit 3, adder unit 4, transmitter unit 5, feedback reception unit 6, decimal time delay and width align unit 7, integer delay unit 8, subtrator 9, digital predistortion unit 10.

Described injection unit 3 is for exporting described Injection Signal;

Described integer delay unit 8 is specifically for carrying out the integer time delay of an integer clock cycle to described base station downlink signal;

Described decimal time delay and width align the amplitude of base station downlink signal of integer time delay that unit 7 carries out non-integer clock cycle decimal time delay specifically for the first feedback signal exported described feedback reception unit exports with the first feedback signal making described feedback reception unit 6 and export and described integer delay unit 8 and phase alignment.

Described second input signal signal is that the first feedback signal is after decimal time delay, amplitude and phase alignment process is carried out with the base station downlink signal of integer time delay, subtraction process is carried out again, the error signal generated after removing the base station downlink signal information of described integer time delay with the base station downlink signal of described integer time delay.Described integer time delay specifically represents time delay base station downlink signal being carried out to an integer clock cycle; Described decimal time delay specifically represents that decimal time delay that the first feedback signal exported described feedback reception unit carries out a non-integer clock cycle is with the amplitude of the base station downlink signal of the first feedback signal making described feedback reception unit export and integer time delay and phase alignment.

Certainly, when transmission channel starts, owing to not having base station downlink signal to input, therefore can receive the large Injection Signal of amplitude to obtain linear compensation factors, the correlation accumulation time can be shortened equally, and larger interference can not be caused to base station downlink signal.At this moment can directly with second input signal of feedback signal as linear Identification not removing base station downlink signal information.

In the present embodiment, the signal be added in described adder unit 4 also can be the base station downlink signal before the described first linear compensating unit 3 linear compensation, namely first injects described Injection Signal, then carries out linear compensation to the signal after being added.Specific algorithm is slightly different, and the effect of linear Identification is similar.

Utilize Injection Signal as the first input signal of linear Identification, utilize the error signal eliminating base station downlink signal information as the second input signal of linear Identification, and in error signal, comprise the linear distortion information of the first input signal and Injection Signal and predistortion inner ring simultaneously, greatly reduce the integration time of Injection Signal like this, improve the efficiency of system.

Referring to Fig. 6, is the composition schematic diagram of the 3rd embodiment of identification system of the present invention.In the present embodiment, described system comprises: the linear compensating unit 2 of linear Identification unit 1, first, injection unit 3, adder unit 4, transmitter unit 5, feedback reception unit 6, decimal time delay and width align unit 7, integer delay unit 8, subtrator 9, digital predistortion unit 10, switch selecting unit 11.

Described injection unit 3 is for exporting described Injection Signal;

Described switch selecting unit 11, to align the second feedback signal that unit 7 exports for receiving error signal that described subtrator 9 exports and described decimal time delay and width, and select described error signal or described second feedback signal to export described linear Identification unit 1 to.

Such as, in order to shorten the correlation accumulation time, the large Injection Signal of amplitude so can be received when transmission channel starts to obtain linear compensation factors.At this moment directly with the contrast signal of feedback signal as linear Identification not removing base station downlink signal information, and the path of closing described error signal can be selected by described switch selecting unit 11.Certainly, described switch selecting unit 11 can also be used for when described digital predistortion unit 10 is trained, and closes the input signal of described linear Identification unit 1 to reduce interference.

Referring to Fig. 7, is the composition schematic diagram of the 4th embodiment of identification system of the present invention.In the present embodiment, described system comprises: the linear compensating unit 2 of linear Identification unit 1, first, injection unit 3, adder unit 4, transmitter unit 5, feedback reception unit 6, decimal time delay and width align unit 7, integer delay unit 8, subtrator 9, digital predistortion unit 10, switch selecting unit 11, second linear compensation unit 12.

Described injection unit 3 is for exporting described Injection Signal;

Described second linear compensation unit 12 to align the second feedback signal that unit 7 exports for receiving described decimal time delay and width, the linear compensation factors calculated according to described linear Identification unit 1 aligns after the second feedback signal that unit 7 exports carries out linear compensation to described decimal time delay and width and generates the 3rd feedback signal, and exports described subtrator 9 to.

Described first linear compensating unit 2 integrates with described digital predistortion unit 10 or arranges separately.

In the present embodiment, described Injection Signal can be pseudo noise (Pseudo-Noise is called for short PN), uses time domain correlation accumulation.Also can be periodic signal as orthogonal frequency division multiplexi (OrthogonalFrequencyDivisionMultiplexing is called for short OFDM), the time domain in life cycle or frequency domain correlation accumulation.

On the whole: base station downlink signal part input integer delay unit 8, another part inputs described digital predistortion unit 10, the described first linear compensating unit 2 is exported to after pre-distortion, described adder unit 4 is exported to after linear compensation, described transmitter unit 5 is exported to after the Injection Signal exported with described injection unit 3 is added, through digital-to-analogue conversion, up-conversion, being converted to after power amplification transmits exports wireless space to, the part transmitted exports to and to export described decimal time delay and width after described feedback reception unit 6 carries out down-conversion and analog-to-digital conversion to and to align unit 7, described decimal time delay and the width unit 7 that aligns receives base station downlink signal from time delay in described integer delay unit 8, align with the base station downlink signal width of described time delay again after the first feedback signal decimal time delay that described feedback reception unit 6 is exported and export described second linear compensation unit 12 to and carry out linear compensation, export described switch selecting unit 11 and described subtrator 9 again to, described subtrator 9 receives the base station downlink signal of time delay in described integer delay unit 8, obtain error signal after the 3rd feedback signal export described second linear compensation module 12 and the base station downlink signal of integer time delay subtract each other and export described switch selecting unit 11 and described digital predistortion unit 10 to, described switch selecting unit 11 selects suitable signal to export described linear Identification unit 1 to more as required, the Injection Signal of signal and described injection unit 3 output that described linear Identification unit 1 receives the output of described switch selecting unit 11 calculates linear compensation factors and exports the described first linear compensating unit 2 and described second linear compensation unit 12 to, complete linear compensation, the error signal calculation pre-distortion coefficients that described digital predistortion unit 10 exports according to base station downlink signal and described subtrator 9, complete the digital pre-distortion process to base station downlink signal.

Based on first, second and third embodiment of identification system of the present invention, the embodiment of the present invention also comprises a kind of base station, described base station comprises any one identification system as above, it should be noted that, in the base station described in the embodiment of the present invention, unit above in any one identification system can be arranged separately in the form of hardware, also can integrate in the form of hardware, can also a part arrange in the form of hardware, a part with software formed be stored in memory, the embodiment of the present invention does not do any restriction.

Referring to Fig. 8, is the composition schematic diagram of device for identifying second embodiment of the present invention.In the present embodiment, described device comprises:

Processor 300 and the memory 400 matched with described processor 300;

The program that described memory 400 performs for storing described processor 300;

The Injection Signal that described processor 300 produces for receiving injection unit, using first input signal of described Injection Signal as linear Identification, and receive the second input signal, wherein, described second input signal comprises the linear distortion information of the predistortion inner ring for carrying out pre-distortion to base station downlink signal and the first input signal after the process of described predistortion inner ring; According to described first input signal received and described second input signal, calculate linear compensation factors.

Wherein, described second input signal be the first feedback signal after decimal time delay, the second feedback signal generated after carrying out phase and magnitude registration process with the base station downlink signal of integer time delay.

Or, described second input signal is that the first feedback signal is after decimal time delay, amplitude and phase alignment process is carried out with the base station downlink signal of integer time delay, subtraction process is carried out again, the error signal generated after removing the base station downlink signal information of described integer time delay with the base station downlink signal of described integer time delay.

Particularly, described first feedback signal is for feedback reception unit is according to the produced signal that transmits of the transmitter unit output received.Describedly transmit as described transmitter unit is changed and the signal exported according to conjunction road signal.Described conjunction road signal is the signal exported after the described Injection Signal that the base station downlink signal after linear compensation of the linear compensation unit output received and described injection unit produce is added by described adder unit.The band of described Injection Signal is wider than bandwidth threshold K, and described bandwidth threshold K is greater than 0.

By the description of above-described embodiment, the present invention has the following advantages:

By receiving the first input signal and the Injection Signal that can carry out effective linear Identification to system performance, and comprise the second input signal of the linear distortion information of predistortion inner ring and the first input signal after the process of described predistortion inner ring, comparatively accurate linear compensation factors can be obtained through calculating, the signal bandwidth that the effect of linear Identification and compensation and digital predistortion unit are exported has nothing to do, and improves the applicability of system; Achieve and carry out good linear compensation to digital predistortion unit output signal, make digital predistortion unit calculate pre-distortion coefficients time error less, final reduction launches distortion; And utilize the error signal calculation linear compensation factors eliminating the base station downlink signal information of time delay, substantially reduce the time of linear Identification, improve the operating efficiency of system; By increasing switch selecting unit, can select the contrast signal carrying out linear Identification according to actual needs, the degree of freedom is high, and applicability is strong; In forward path and feedback control loop, all arrange linear compensation unit, can improve the effect of linear compensation, lower error when calculating pre-distortion coefficients, final minimizing launches distortion.

One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can have been come by the hardware that program command is relevant, aforesaid program can be stored in a computer read/write memory medium, this program, when performing, performs the step comprising said method embodiment; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.

A kind of discrimination method provided the embodiment of the present invention above, Apparatus and system are described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims

1. a discrimination method, is characterized in that, comprising:

2. the method for claim 1, it is characterized in that, described second input signal is that the first feedback signal is after decimal time delay, the second feedback signal generated after carrying out phase and magnitude registration process with the base station downlink signal of integer time delay, wherein, described first feedback signal is for feedback reception unit is according to the produced signal that transmits of the transmitter unit output received.

3. the method for claim 1, it is characterized in that, described second input signal is that the first feedback signal is after decimal time delay, amplitude and phase alignment process is carried out with the base station downlink signal of integer time delay, subtraction process is carried out again with the base station downlink signal of described integer time delay, the error signal generated after removing the base station downlink signal information of described integer time delay, wherein, described first feedback signal is for feedback reception unit is according to the produced signal that transmits of the transmitter unit output received.

4. the method as described in claim 2 or 3, it is characterized in that, describedly transmit as described transmitter unit is changed and the signal exported according to conjunction road signal, wherein, described conjunction road signal is the signal exported after the described Injection Signal that the base station downlink signal after linear compensation of the linear compensation unit output received and described injection unit produce is added by adder unit.

5. method as claimed in claim 4, it is characterized in that, the band of described Injection Signal is wider than bandwidth threshold K, and described bandwidth threshold K is greater than 0.

6. a device for identifying, is characterized in that, comprising:

7. device as claimed in claim 6, it is characterized in that, described second input signal is that the first feedback signal is after decimal time delay, the second feedback signal generated after carrying out phase and magnitude registration process with the base station downlink signal of integer time delay, wherein, described first feedback signal is for feedback reception unit is according to the produced signal that transmits of the transmitter unit output received.

8. device as claimed in claim 6, it is characterized in that, described second input signal is that the first feedback signal is after decimal time delay, amplitude and phase alignment process is carried out with the base station downlink signal of integer time delay, subtraction process is carried out again with the base station downlink signal of described integer time delay, the error signal generated after removing the base station downlink signal information of described integer time delay, wherein, described first feedback signal is for feedback reception unit is according to the produced signal that transmits of the transmitter unit output received.

9. device as claimed in claim 7 or 8, it is characterized in that, describedly transmit as described transmitter unit is changed and the signal exported according to conjunction road signal, wherein, described conjunction road signal is the signal exported after the described Injection Signal that the base station downlink signal after linear compensation of the linear compensation unit output received and described injection unit produce is added by adder unit.

10. device as claimed in claim 9, it is characterized in that, the band of described Injection Signal is wider than bandwidth threshold K, and described bandwidth threshold K is greater than 0.

11. 1 kinds of identification systems, is characterized in that, comprising:

Injection unit, for exporting described Injection Signal;

Decimal time delay and width align unit, for receiving the first feedback signal that the base station downlink signal of integer time delay and described feedback reception unit export, generating the second feedback signal by after described first feedback signal decimal time delay with after the amplitude of the base station downlink signal of described integer time delay and phase alignment and export;

12. systems as claimed in claim 11, is characterized in that, described second input signal be described decimal time delay and width align unit export the second feedback signal, or be described subtrator output error signal.

13. systems as described in claim 11 or 12, it is characterized in that, described integer delay unit is specifically for carrying out the integer time delay of an integer clock cycle to described base station downlink signal; Described decimal time delay and width align the amplitude of base station downlink signal of integer time delay that unit carries out non-integer clock cycle decimal time delay specifically for the first feedback signal exported described feedback reception unit exports with the first feedback signal making described feedback reception unit export and described integer delay unit and phase alignment.

14. systems as claimed in claim 13, it is characterized in that, described system also comprises:

15. systems as claimed in claim 14, it is characterized in that, described system also comprises:

16. systems as claimed in claim 15, is characterized in that, the described first linear compensating unit and described digital predistortion unit integrate or arrange separately.

17. 1 kinds of base stations, is characterized in that, comprising:

System as described in any one of claim 11-16.