CN101436868B - Digital baseband system for compensating for analog radio transmitter impairments - Google Patents
Digital baseband system for compensating for analog radio transmitter impairments Download PDFInfo
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- CN101436868B CN101436868B CN2008101863313A CN200810186331A CN101436868B CN 101436868 B CN101436868 B CN 101436868B CN 2008101863313 A CN2008101863313 A CN 2008101863313A CN 200810186331 A CN200810186331 A CN 200810186331A CN 101436868 B CN101436868 B CN 101436868B
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Abstract
In order to compensate for performance degradation caused by inferior low-cost analog radio component tolerances of an analog radio, a wireless communication transmitter employs a control process to implement numerous digital signal processing (DSP) techniques to compensate for deficiencies of such analog components so that modern specifications may be relaxed. By monitoring a plurality of parameters associated with the analog radio, such as temperature, bias current or the like, enhanced phase and amplitude compensation, as well as many other radio frequency (RF) parameters may be implemented.
Description
The application is dividing an application of application number is 200480013897.6, the applying date is on May 10th, 2004 patent application.
Technical field
The invention relates to the conveyer design of wireless communication system.Particularly, the invention relates to Digital Signal Processing (DSP) technology, use the infringement that the compensating analog radio transmitter is given birth to, such as: passband distortion, carrier leak, amplitude is uneven, phase place is uneven or like that.
Background technology
For system designer, the transmit communications signals of existing wireless system framework can have the restriction of severe usually.In addition, this class wireless system framework can provide communication link and the high running cost of low reliability usually, and the conformability of this class wireless system framework and other system component also can present imperfectly low.
In radio frequency (RF) section of the traditional low-cost radio transmitter with simulated assembly, the processing of radio frequency (RF) signal can be accompanied by the distortion of certain degree usually.This class distortion can comprise usually: carrier leak, phase place are uneven, amplitude is uneven or like that.The expensive assembly that have better distorted characteristic, can strengthen signal quality then may be ignored in the design phase, uses the cost that reduces final products.
Owing to process the assembly cost of radio frequency (RF) analog signal far above the assembly that uses Digital Signal Processing (DSP), so digital baseband system (DBB), comprise: the low-cost conveyer that low noise and minimum power require preferably can use Digital Signal Processing (DSP) technology as far as possible.
Summary of the invention
For the usefulness of the bad low-cost artificial antenna composition tolerance of compensating analog wireless transmission reduces, the radio communication conveyer is to utilize a kind of control program with various Digital Signal Processing (DSP) technology of enforcement compensating analog composition deficiency, and then the specification that conforms to current standards.Via temperature, drift current, suchlike supervision, the phase place of reinforcement and amplitude compensation, just can implement together with other various radio frequencies (RF) parameter.
In preferred embodiment, a kind of digital baseband of the present invention (DBB) conveyer or a kind of wireless transmission/receive unit (WTRU), it has: an artificial antenna conveyer, one digital pre-distortion compensating module, one digital DC (DC) migration module, the uneven compensating module of one digital amplitude, the uneven compensating module of one digit phase, at least one digital analog converter (DAC), use the interface that forms these digital compensation modules and this artificial antenna conveyer, at least one controller, use with this artificial antenna conveyer and each these digital compensation modules and communicate, wherein, these digital compensation modules are radio frequency (RF) the parameter deficiencies of proofreading and correct this artificial antenna conveyer.
This digital baseband (DBB) conveyer can have more: a modulation demodulator, use producing homophase (I) and quadrature (Q) signal component that inputs to each these digital compensation modules, this digital analog converter (DAC), this artificial antenna conveyer.
This digital baseband (DBB) conveyer can have more: a low pass filter (LPF) is coupled to each this homophase (I) signal component and this quadrature (Q) signal component of this digital pre-distortion compensating module.This low pass filter (LPF) can be a rised cosine (RRC) filter.
This artificial antenna conveyer can have: a power amplifier, a modulator, a power detecting device, a temperature inductor, use the temperature reading, the drift current inductor that monitor this artificial antenna conveyer, use a drift current reading that monitors this artificial antenna conveyer.At least one these digital compensation modules can in response in this drift current inductor or this temperature inductor to activate.
This digital baseband (DBB) conveyer can have more: an internal memory, use storing plural number table look-up (LUT).In response in this temperature reading of this temperature inductor, these table look-up one of (LUT) table look-up is to select to be used for this digital pre-distortion compensating module.
This power amplifier may be inclined to a linear deficiency.This digital pre-distortion compensating module can be accurate in response to the input power position of this power amplifier of detecting in this power detecting device, and, this selection table look-up gain and the phase property of this power amplifier that (LUT) store, and then phase place and the amplitude of this homophase of distortion (I) signal component and this quadrature (Q) signal component, use making this power amplifier can produce a linear response but not distortion response.
It is not enough that this modulator may be inclined to a carrier leak.One minimum detecting reading of each these signal inputs can determine.First and second direct current (DC) migration numerical value is can be in response to detecting readings to determine in these minimums.This digital DC (DC) migration module can be in response in these first and second direct current (DC) migration numerical value, and then it is accurate to eliminate the carrier leak of this modulator to adjust direct current (DC) position of these signals inputs.This modulator can have regional oscillator (LO) frequency, uses to determine these minimum detecting readings.
It is on average not enough that this modulator may be inclined to an amplitude.The uneven compensating module of this digital amplitude can be adjusted the power level of one of this homophase (I) signal component and this quadrature (Q) signal component signal component, uses making the power level of this homophase (I) signal component and this quadrature (Q) signal component identical.
It is not enough that this modulator may be inclined to a phase average.The uneven compensating module of this digit phase is the phase place that can adjust this homophase (I) signal component and this quadrature (Q) signal component, uses making the phase place of this homophase (I) signal component and this quadrature (Q) signal component orthogonal.
In sum, the invention provides a kind of digital baseband conveyer, it comprises: (A) artificial antenna conveyer that comprises temperature inductor; (B) plural digital compensation module; (C) internal memory is used the storage plural number and is tabled look-up; And (D) at least one controller, use with this artificial antenna conveyer and each these digital compensation module and communicate, wherein, these digital compensation modules are the radio frequency parameter deficiencies of proofreading and correct this artificial antenna conveyer, this temperature inductor monitors a temperature reading relevant with this artificial antenna conveyer, and, in response to this temperature reading that monitors in this temperature inductor, these specific tabling look-up of tabling look-up are selected to be used at least one this digital compensation module from this internal memory with setup parameter, and, these digital compensation modules have a digital DC migration module, this digital DC migration module has two signals that comprise in-phase signal composition and an orthogonal signalling composition and inputs, this artificial antenna conveyer has a modulator of tendency one carrier leak deficiency, determine that one of relevant with each these signals input minimum detects the power reading, first and second DC-offset compensation numerical value determines by these minimum detecting power readings of interpolation, and, this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator.
The present invention also provides a kind of wireless transmission/receive unit, and it comprises: (A) artificial antenna conveyer that comprises temperature inductor; (B) plural digital compensation module; (C) internal memory is used the storage plural number and is tabled look-up; And (D) at least one controller, use with this artificial antenna conveyer and each these digital compensation module and communicate, wherein, these digital compensation modules are the radio frequency parameter deficiencies of proofreading and correct this artificial antenna conveyer, this temperature inductor monitors a temperature reading relevant with this artificial antenna conveyer, and, in response to this temperature reading that monitors in this temperature inductor, these specific tabling look-up of tabling look-up are selected to be used at least one this digital compensation module from this internal memory with setup parameter, and, these digital compensation modules have a digital DC migration module, this digital DC migration module has two signals that comprise in-phase signal composition and an orthogonal signalling composition and inputs, this artificial antenna conveyer has a modulator of tendency one carrier leak deficiency, determine that one of relevant with each these signals input minimum detects the power reading, first and second DC-offset compensation numerical value determines by these minimum detecting power readings of interpolation, and, this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator.
The present invention also provides a kind of integrated circuit, inputs to a signal that comprises the artificial antenna conveyer of temperature inductor in order to processing, and this integrated circuit comprises: (A) plural digital compensation module; (B) internal memory is used the storage plural number and is tabled look-up; And (C) at least one controller, use with each these digital compensation module and communicate, wherein, these digital compensation modules are the radio frequency parameter deficiencies of proofreading and correct this artificial antenna conveyer, and, in response to this temperature reading that monitors in this temperature inductor, these specific tabling look-up of tabling look-up are selected to be used at least one this digital compensation module from this internal memory with setup parameter, and, these digital compensation modules have a digital DC migration module, this digital DC migration module has the two signals input that comprises an in-phase signal composition and an orthogonal signalling composition, this analogue radio transmissions utensil has a modulator of tendency one carrier leak deficiency to determine a minimum detecting power reading relevant with each these signal input, first and second DC-offset compensation numerical value determines by these minimum detecting power readings of interpolation, and this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator.
The present invention also provides a kind of digital baseband conveyer, and it comprises: (A) artificial antenna conveyer, this artificial antenna conveyer have a modulator of tendency one carrier leak deficiency; (B) a digital DC migration module, this digital DC migration module has two signals that comprise in-phase signal composition and an orthogonal signalling composition and inputs, wherein, determine a minimum detecting power reading relevant with each these signal input, first and second DC-offset compensation numerical value determines by these minimum detecting power readings of interpolation, and, this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator.
The present invention also provides a kind of wireless transmission/receive unit, and it comprises: (A) artificial antenna conveyer, this artificial antenna conveyer have a modulator of tendency one carrier leak deficiency; (B) a digital DC migration module, this digital DC migration module has two signals that comprise in-phase signal composition and an orthogonal signalling composition and inputs, wherein, determine a minimum detecting power reading relevant with each these signal input, first and second DC-offset compensation numerical value determines by these minimum detecting power readings of interpolation, and, this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator.
The present invention also provides a kind of integrated circuit, input to the signal of an artificial antenna conveyer in order to processing, this artificial antenna conveyer has a modulator of tendency one carrier leak deficiency, this integrated circuit comprises: (A) digital DC migration module, this digital DC migration module has two signals that comprise in-phase signal composition and an orthogonal signalling composition and inputs, wherein, determine a minimum detecting power reading relevant with each these signal input, first and second DC-offset compensation numerical value determines by these minimum detecting power readings of interpolation, and, this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator; (B) at least one digital analog converter is in order to form the interface of these digital compensation modules and this analogue radio transmissions device.
For further specifying above-mentioned purpose of the present invention, design feature and effect, below with reference to accompanying drawing the present invention is described in detail.
Description of drawings
Fig. 1 is a kind of calcspar with conveyer of digital baseband (DBB) compensation processor of the preferred embodiment according to the present invention;
In Fig. 2 presentation graphs 1 digital baseband (DBB) compensation processor, the Organization Chart of each digital compensation module;
The Organization Chart of Fig. 3 presentation graphs 2 digital compensation modules;
The flow chart of the compensation for loss and damage control program of Fig. 4 presentation graphs 1 conveyer;
The Organization Chart of Fig. 5 presentation graphs 2 digital pre-distortion compensating modules;
The Organization Chart of Fig. 6 presentation graphs 2 digital DCs (DC) migration module;
The Organization Chart of the uneven compensating module of Fig. 7 presentation graphs 2 digital amplitudes; And
The Organization Chart of the uneven compensating module of Fig. 8 presentation graphs 2 digit phases.
Embodiment
The invention relates to a kind of digital baseband (DBB) conveyer, it can utilize the wireless composition of low usefulness and the low radio performance of compensating digits base band (DBB), uses the high-effect solution of radio frequency (RF) is diverted in digital baseband (DBB).Therefore, the present invention can promote low cost, low power consumption, low hardware complexity.And via the mutual optimization between radio frequency (RF) and digital baseband (DBB), the compensation of the usefulness of digital baseband (DBB) can also be in being limited by radio frequency (RF) feature of integrating with digital baseband (DBB).
The preferably, this digital baseband (DBB) conveyer is to be integrated in wireless transmission/receive unit (WTRU).In this article, wireless transmission/receive unit (WTRU) is including, but not limited to user's equipment (UE), mobile station, fixing or mobile subscriber unit, beeper, maybe can operate in any other types of devices of wireless environment.In addition, the feature of this digital baseband (DBB) conveyer can also be integrated in integrated circuit (IC), or the feature of this digital baseband (DBB) conveyer can also framework be the circuit with a large amount of interconnection compositions.
In addition, the present invention can also be applicable to utilize timesharing two (TDD), frequency division duplexings (FDD), code division multiple access (CDMA), code division multiple access 2,000 (CDMA2000), the synchronous code division multiple access of timesharing (TDSCDMA), orthogonal frequency division multi-task (OFDM) or suchlike communication system.
Fig. 1 represents the calcspar of a kind of digital baseband (DBB) conveyer 100.This digital baseband (DBB) conveyer 100 has a modulation demodulator 105, it is exported respectively has homophase (I) and quadrature (Q) signal component 110,115 digital signal and with these digital signals, via low pass filter (LPF) 120,125, be sent to digital baseband (DBB) compensation processor 130 and digital analog converter (DAC) circuit 135, use analog signal output to artificial antenna conveyer 150.Low pass filter (LPF) 120,125 can be root rised cosine (RRC) filter or other suitable filter.This digital analog converter (DAC) circuit 135 has digital analog converter (DAC) 140,145.
This digital baseband (DBB) conveyer 100 has more a controller 155, and it carries out this digital baseband (DBB) compensation processor 130 and all initiatively control of composition maintenances of this artificial antenna conveyer 150.In addition, this controller 155 is to control (TPC) signal by the through-put power that base station or other entity receive by this modulation demodulator 105 of access, and accordingly, this controller 150 just can be carried out and calculate or other function.
This artificial antenna conveyer 150 has an antenna 160, a power amplifier 165, a modulator 170, a power detecting device 175, monitors a temperature inductor 180 of artificial antenna conveyer 150 temperature, measures one of artificial antenna conveyer 150 drift currents drift current inductor 185.The composition of artificial antenna conveyer 150 is become to be grouped into by the low cost (" low-quality ") of the specification that conforms to current standards.For instance, because the pre-distortion compensated module of this digital baseband (DBB) compensation processor 130, the specification of this power amplifier 165 does not need very strict.
Please refer to Fig. 2, digital baseband (DBB) compensation processor 130 has at least one module of following modules, uses the usefulness of strengthening this artificial antenna conveyer 150, and it comprises:
(1) the digital pre-distortion compensating module 205;
(2) digital DC (DC) migration module 210;
(3) the uneven compensating module 215 of digital amplitude; And
(4) the uneven compensating module 220 of digit phase.
This digital pre-distortion compensating module 205 can be used for proofreading and correct the transmission amplitude characteristic, such as: amplitude modulation (AM) signal characteristic to amplitude modulation (AM) and amplitude modulation (AM) to phase modulation (PM).In this artificial antenna conveyer 150, the amplitude of power amplifier 165 and phase property be utilize the statistical sampling method or according to power detecting device 175 manufacturer's specifications to determine.This digital pre-distortion compensating module 205 is in response in the through-put power control (TPC) that receives signal input and 105 receptions of modulation demodulator, uses the power of the antenna 160 of this artificial antenna conveyer 150 of prediction.Known gain and phase property based on this power amplifier 165, this digital pre-distortion compensating module 205 is deliberately phase place and the amplitude of distortion homophase (I) and quadrature (Q) signal component just, uses making this power amplifier 165 produce linear responses but not the distortion response.This digital pre-distortion compensating module 205 can also with reference to tabling look-up (LUT) or like that, be used the counter-rotating that obtains this class A amplifier A feature.Preferred embodiment of the present invention is relatively favourable, because: even using cheaply, this artificial antenna conveyer 150 reaches inferior composition (for instance, hang down the amplifier of power output limit), and radio frequency (RF) parameter and standard (such as: the intermodulation distortion) can also obtain to satisfy.
This digital DC (DC) migration module 210 can be based on first and second direct current (DC) migration numerical value of previous decision (that is: store), and it is accurate to proofread and correct the carrier leak of (that is: constrain) this artificial antenna conveyer 150 to adjust direct current (DC) position of these homophases (I) and quadrature (Q) signal component.Determine these direct currents (DC) migration numerical value, the homophase (I) of this digital baseband (DBB) and quadrature (Q) signal component input 110,115 must switch to controller 155 (diverter switch is not shown among the figure) by modulation demodulator 105.This controller 155 can scan respectively these homophases (I) and quadrature (Q) signal component input 110,115 direct current (DC) position accurate (for instance: by negative sequentially to just or by just sequentially to negative), simultaneously, this power detecting device 175 can determine with regional oscillator (LO) frequency of modulator 170 each first and second minimum detecting reading.(for instance, this controller 155 not sweep signal composition input is set as zero, uses that it is closed) then can be temporarily interrupted in the signal component input that does not scan at present.
First and second direct current (DC) migration numerical value (that is: compensating factor K1 and K2) be that first and second minimum detecting reading of interpolation is to obtain.Subsequently, first and second direct current (DC) migration numerical value can store for following reference, by this, the input of these homophases (I) and quadrature (Q) signal component just can be respectively in response in first and second direct current (DC) migration numerical value to adjust.
In another kind of preferred embodiment, this controller 155 can cooperate detecting algorithm and this power detecting device 175 to use.This controller 155 is direct current (DC) the position standards that scan simultaneously each homophase (I) and the input of quadrature (Q) signal component.This detecting algorithm is to utilize coordinate system to use to determine at least one minimum detecting reading, by this, direct current (DC) the position standard of each homophase (I) and the input of quadrature (Q) signal component just can put on X-axis and Y-axis, simultaneously, the detecting reading of these power detecting device 175 inductions can also be applied to Z axis.
The uneven compensating module 215 of this digital amplitude can be used for average these homophases (I) and quadrature (Q) signal component, uses the modulator 170 that makes this artificial antenna conveyer 150 and can utilize equal-wattage position these homophases of accurate modulation (I) and the input of quadrature (Q) signal component.Suppose that this modulator 170 is cheap and low-quality, then this modulator 170 is to tend on average deficiency of amplitude.For instance, if this homophase (I) signal component this quadrature of input ratio (Q) signal component is inputted little 1.0dB, just then the uneven compensating module 215 of this digital amplitude can make the power level of this quadrature (Q) signal component input reduce 1.0dB.So, the output of this modulator 170, that is: these homophases (I) and the input of quadrature (Q) signal component just can have same-amplitude.Utilize this controller 155, these homophases (I) and the input of quadrature (Q) signal component just can be distinguished switch.For instance, if this controller 155 cuts out the input of this quadrature (Q) signal component, then only there is the input of this homophase (I) signal component to be sent out, and this controller 155 just can determine the power level that the power detecting device 175 of this artificial antenna conveyer 150 reads.Suppose that this power level is desirable target bit standard, then the input of this homophase (I) signal component just can be closed, and the input of this quadrature (Q) signal component can be opened once again.The uneven compensating module 215 of this digital amplitude can be adjusted the power level of this quadrature (Q) signal component input, use make the power detecting device can read simultaneously the equal-wattage position of these homophases (I) and the input of quadrature (Q) signal component accurate (that is: desirable target bit standard).
In addition, this modulator 170 also can tend to the phase average deficiency.The uneven compensating module 220 of this digit phase can be used for the phase place of average these homophases (I) and quadrature (Q) signal component.These homophases (I) and the input of quadrature (Q) signal component are to activate simultaneously, and, the power level of these homophases (I) and quadrature (Q) signal component input is to reduce respectively 3dB (that is: cut half, using the power level that this power detecting device 175 is measured, only to equal the target power position of one of these homophases (I) and the input of quadrature (Q) signal component signal component input accurate).This program is to set up reference power position standard, uses with the measurement of this power detecting device 175 and compares.If measuring the difference of power level at present, reference power position standard and power inductor 175 equal the dreamboat power level, then the input of these homophases (I) and quadrature (Q) signal component is quadrature, by this, real number and imaginary signal partly are to have phase quadrature.In response in the power level reading of the power detecting device 175 of artificial antenna conveyer 150, these homophases (I) and the input of quadrature (Q) signal component be expression less than phase quadrature: the readout power position standard of this power detecting device 175 is accurate greater than the target power position.In addition, the input of these homophases (I) and quadrature (Q) signal component is big is expression in phase quadrature: the readout power position standard of this power detecting device 175 is accurate less than the target power position.Therefore, the uneven adjusting module 220 of this digit phase is in response to the differing of the Differential derivatization between target power position standard and power detecting device 175 readout power position standards, to use and to carry out the phase place adjustment.
The digital adjusting module of this digital baseband (DBB) compensation processor 130 can design according to various frameworks.Yet, it should be noted that low pass filter (LPF) 120,125 must be placed on this digital pre-distortion compensating module 205 fronts.Fig. 3 is in representative digit base band (DBB) compensation processor 130, the better enforcement framework 300 of modules.
Fig. 4 is the steps flow chart of the compensation for loss and damage program 400 of expression a kind of digital baseband (DBB) conveyer 100.In step 405, open the beginning flag and be set as one, use this compensation for loss and damage program 400 of expression through beginning.In step 410, select the communication pattern of wanting.Communication pattern can be time division duplex (TDD), frequency division duplexing (FDD) or any other communication pattern, such as: the synchronous code division multiple access of timesharing (TDSCDMA), orthogonal frequency division multi-task (OFDM), code division multiple access 2,000 (CDMA2000) or like that.
In step 415, if select time division duplex (TDD) pattern, then activate time division duplex (TDD) pattern.In step 420, if select frequency division duplexing (FDD) pattern, then activate frequency division duplexing (FDD) pattern.In step 425, if select other communication pattern, then activate other communication pattern.In step 430, utilize the offset conditions of drift current inductor 185 these artificial antenna conveyers 150 of supervision, its expression: for instance, the electric current that power amplifier 165 extracts.
In step 435, utilize temperature inductor 180 to monitor the temperature of this artificial antenna conveyer 150 (or selection component).In step 440, read open the beginning flag with determine whether this program has been finished at least one cycle (that is: step 445,450,455).Be set as one open the beginning flag, as described in step 405, be expression: not yet finish at least one cycle.If open the beginning flag, in step 440, be set as one, then step 445 can be based on the temperature of temperature inductor 180 supervision and/or the drift current of drift current inductor 185 measurements, tabled look-up by the plural number of the internal memory 190 of tabling look-up and to select one in (LUT) and table look-up, use the pre-distortion compensated parameter of setting this digital pre-distortion compensating module.
The amplitude of this power amplifier 165 or phase place change (such as this power detecting device 175 supervisions) or the program person of digital baseband (DBB) conveyer 100 and/or any other parameter that the designer wants to monitor all can utilize, use by one of selection in this (LUT) internal memory 190 of tabling look-up and table look-up.This (LUT) internal memory 190 of tabling look-up can be positioned over this digital pre-distortion compensating module 205, this controller 155 or this digital baseband (DBB) conveyer 100 Anywhere.
In step 450, utilize this digital DC (DC) migration module 210 constrain the carrier leak of these homophases (I) and the input of quadrature (Q) signal component (that is: direct current (DC) position standard).In step 455, utilize amplitude and the phase place of uneven compensating module 220 compensation these homophases (I) of the uneven compensating module 215 of this digital amplitude and this digit phase and the input of quadrature (Q) signal component uneven, as discussed previously.
After this compensation for loss and damage program 400 is finished one-period, that is: when completing steps 455, this opens the beginning flag, in step 460, can be set as zero, and, this compensation for loss and damage program 400 can be returned step 430 again, if step 465 is found the marked change of drift current and/or temperature, that is: the various parametric compensations of this artificial antenna conveyer 150 repeated, as described in step 445,450,455.
When opening this digital baseband (DBB) conveyer 100, we can imagine: whole digital compensation modules of digital baseband (DBB) compensation processor 130 are before beginning communication, with whole parameter optimizations of this artificial antenna conveyer 150.After communication beginning, these digital compensation modules 205,210,215,220 particular module then can be periodically, continuously or in response to requiring to implement in particular event or user.For instance, if detecting temperature, the temperature inductor 180 of this artificial antenna conveyer 150 rises (for instance, 5 degree rise), then these digital compensation modules 205,210,215, at least one digital compensation module of 220 just may activate to compensate.
Fig. 5 is the preferred architecture figure of this pre-distortion compensated module 205 of expression, and it has: power prediction unit 505, multiplexer 510,515,520,525,530, adder 535,540,545,550, (LUT) 555 that table look-up, phase compensation unit 560.These homophases (I) and the input of quadrature (Q) signal component are to utilize power prediction unit 505 to receive, and using power prediction is I
2+ Q
2Output (the I of this power prediction unit 505
2+ Q
2) can utilize multiplier 510 to be multiplied by through-put power control (TPC), and, the product that this power prediction unit 505 obtains can input to (LUT) 555 that table look-up, and using provides the amplitude modulation of these artificial antenna conveyer 150 deficiencies (AM) to amplitude modulation (AM) to compensate.Through-put power control (TPC) can be controlled the power output of this artificial antenna conveyer 150, and it can be expressed as: (I
2+ Q
2) * (TPC).This (LUT) 555 that table look-up provides radio frequency (RF) feature of this power amplifier 165 and/or these artificial antenna conveyer 150 other compositions, uses the deficiency that makes this power amplifier 165 (such as: imperfect gain compression and cause the dynamic range feature of antenna 160 non-linear radio frequencies (RF) output) and can eliminate fully.The output meeting of this (LUT) 555 that table look-up is multiplied by respectively the input of homophase (I) signal component and the input of quadrature (Q) signal component via multiplexer 515 and 520.Therefore, the amplitude characteristic of these homophases (I) and quadrature (Q) signal component input (LUT) 555 that just can table look-up according to this uses the distortion amplitude characteristic of this artificial antenna conveyer 150 of compensation.
Continue, please refer to Fig. 5, product (I
2+ Q
2) and the product of through-put power control (TPC) also can input to phase compensation unit 560, using provides the amplitude modulation of these artificial antenna conveyer 150 deficiencies (AM) to phase modulation (PM) to compensate.This phase compensation unit 560, it cooperates multiplexer 525,530 and adder 545550 operations, can adjust differing of these homophases (I) and quadrature (Q) signal component input, use the phase place that makes the input of these homophases (I) and quadrature (Q) signal component orthogonal (that is: real number and imaginary signal partly have phase quadrature).
Fig. 6 is the preferred architecture figure of expression this digital DC (DC) migration module 210, and it has: adder 605 and 610.Compensating factor K
1And K
2Be to add respectively these homophases (I) and the input of quadrature (Q) signal component, use the imperfect direct current of deletion (DC) skew and eliminate carrier leak.
Fig. 7 is the preferred architecture figure of the uneven compensating module 215 of this digital amplitude of expression, and it has: multiplier 705 and adder 710.Compensating factor K
1To utilize multiplier 705 to be multiplied by the input of quadrature (Q) signal component, and, obtaining product is to utilize adder 710 to add the input of quadrature (Q) signal component, by this, the power level of this quadrature (Q) signal component input just can be adjusted to the identical bits standard of this homophase (I) signal component input.The purpose that it should be noted that this multiplier 705 only be for avoid this quadrature (Q) signal component input do not expect interruption (that is: compensating factor K
1=0 situation).Perhaps, the framework of multiplier 705 and adder 710 can also cooperate the input of this homophase (I) signal component, or, cooperate simultaneously the input of these homophases (I) and quadrature (Q) signal component.
Fig. 8 is the preferred architecture figure of the uneven compensating module 220 of this digit phase of expression, and it has: adder 805,810 and multiplier 815,820.In response in the not orthogonal phase error 825 of phase place of these homophases (I) and the input of quadrature (Q) signal component, the phase place of these homophases (I) and the input of quadrature (Q) signal component just can be adjusted.
Although the present invention describes with reference to current specific embodiment, but those of ordinary skill in the art will be appreciated that, above embodiment illustrates the present invention, in the situation that does not break away from spirit of the present invention, also can make variation or the replacement of various equivalences, therefore, as long as in connotation scope of the present invention in the scope to the variation of above-described embodiment, claims that modification all will drop on the application.
Claims (27)
1. digital baseband conveyer comprises:
The artificial antenna conveyer, described artificial antenna conveyer comprises:
Power amplifier,
Modulator, and
Temperature inductor is in order to monitor the temperature reading that is associated with described artificial antenna conveyer;
Internal memory comprises a plurality of look-up table LUT, gain and the phase property of the described power amplifier of described a plurality of look-up table stores; And
A plurality of digital compensation modules, described a plurality of digital compensation modules comprise:
Digital DC DC migration module, described digital DC migration module has two signal inputs that comprise homophase (I) signal component and quadrature (Q) signal component, and described digital DC migration module is configured to proofread and correct the carrier leak that is associated with described modulator;
Power detector, this power detector is configured to:
Definite minimum detection reading that is associated with each described signal input; With
Determine first and second DC migration numerical value based on the described minimum detection reading of interpolation; And
Described digital DC DC migration module is configured to adjust based on described first and second DC migration numerical value the DC level separately of described two signals input, wherein by select the one among described a plurality of look-up table LUT to come to be at least one setting compensation parameter in the described compensating module based on described temperature reading.
2. digital baseband conveyer according to claim 1, wherein said artificial antenna conveyer also comprises:
The bias current inductor, be used for monitoring the bias current reading that is associated with described artificial antenna conveyer, wherein by select the one among described a plurality of look-up table LUT to come to be at least one setting compensation parameter in the described digital compensation module based on described bias current reading.
3. digital baseband conveyer according to claim 1, wherein said digital compensation module comprises the digital pre-distortion compensating module.
4. digital baseband conveyer according to claim 3, wherein said digital pre-distortion compensating module has two signal inputs that comprise in-phase signal composition and orthogonal signalling composition, and described digital pre-distortion compensating module is configured to based on the gain of described power amplifier stored in the selected look-up table and phase property and makes phase place and the amplitude distortion of described in-phase signal composition and described orthogonal signalling composition, so that described power amplifier produces linear response, but not the distortion response.
5. digital baseband conveyer according to claim 1, wherein said digital compensation module comprises the digital pre-distortion compensating module, described digital pre-distortion compensating module has two signal inputs that comprise homophase input and quadrature input, and described digital baseband conveyer also comprises:
Low pass filter is coupled to each described homophase input and the input of described quadrature of described digital pre-distortion compensating module.
6. digital baseband conveyer according to claim 5, wherein said low pass filter is root raised cosine filter.
7. digital baseband conveyer according to claim 1, wherein said modulator has regional oscillator frequency, in order to determine described minimum detection reading.
8. digital baseband conveyer according to claim 1, wherein said digital compensation module comprises digital amplitude imbalance compensation module, described digital amplitude imbalance compensation module has two signal inputs that comprise in-phase signal composition and orthogonal signalling composition, and described digital amplitude imbalance compensation module is configured to adjust one of them power level of described in-phase signal composition and described orthogonal signalling composition, so that each power level of described in-phase signal composition and described orthogonal signalling composition is identical.
9. digital baseband conveyer according to claim 1, wherein said digital compensation module comprises digit phase imbalance compensation module, described digit phase imbalance compensation module has the phase place that two signals input of comprising in-phase signal composition and orthogonal signalling composition and described digit phase imbalance compensation module are configured to adjust described in-phase signal composition and described orthogonal signalling composition, so that each phase place of described in-phase signal composition and described orthogonal signalling composition is orthogonal.
10. wireless transmission/receive unit comprises:
The artificial antenna conveyer, described artificial antenna conveyer comprises:
Power amplifier,
Modulator, and
Temperature inductor is used for monitoring the temperature reading that is associated with described artificial antenna conveyer;
Internal memory comprises a plurality of look-up table LUT, gain and the phase property of the described power amplifier of described a plurality of look-up table stores; And
A plurality of digital compensation modules, described a plurality of digital compensation modules comprise:
Digital DC DC migration module, described digital DC migration module has two signal inputs that comprise homophase (I) signal component and quadrature (Q) signal component, and described digital DC migration module is configured to proofread and correct the carrier leak that is associated with described modulator;
Power detector, this power detector is configured to:
Definite minimum detection reading that is associated with each described signal input; With
Determine first and second DC migration numerical value based on the described minimum detection reading of interpolation; And
Described digital DC DC migration module is configured to adjust based on described first and second DC migration numerical value the DC level separately of described two signals input, wherein by select the one among described a plurality of look-up table LUT to come to be at least one setting compensation parameter in the described compensating module based on described temperature reading.
11. wireless transmission/receive unit according to claim 10, wherein said artificial antenna conveyer also comprises:
The bias current inductor, be used for monitoring the bias current reading that is associated with described artificial antenna conveyer, wherein by select the one among described a plurality of look-up table LUT to come to be at least one setting compensation parameter in the described digital compensation module based on described bias current reading.
12. wireless transmission/receive unit according to claim 10, wherein said digital compensation module comprises the digital pre-distortion compensating module.
13. wireless transmission/receive unit according to claim 12, wherein said digital pre-distortion compensating module has two signal inputs that comprise in-phase signal composition and orthogonal signalling composition, and described digital pre-distortion compensating module is configured to based on the gain of described power amplifier stored in the selected look-up table and phase property and makes phase place and the amplitude distortion of described in-phase signal composition and described orthogonal signalling composition, so that described power amplifier produces linear response, but not the distortion response.
14. wireless transmission/receive unit according to claim 10, wherein said digital compensation module comprises the digital pre-distortion compensating module, described digital pre-distortion compensating module has two signal inputs that comprise homophase input and quadrature input, and described wireless transmission/receive unit also comprises:
Low pass filter is coupled to each described homophase input and the input of described quadrature of described digital pre-distortion compensating module.
15. wireless transmission/receive unit according to claim 14, wherein said low pass filter is root raised cosine filter.
16. wireless transmission/receive unit according to claim 10, wherein said modulator have zone concussion frequency, in order to determine described minimum detection reading.
17. wireless transmission/receive unit according to claim 10, wherein said digital compensation module comprises digital amplitude imbalance compensation module, described digital amplitude imbalance compensation module has two signal inputs that comprise in-phase signal composition and orthogonal signalling composition, and described digital amplitude imbalance compensation module is configured to adjust one of them power level of described in-phase signal composition and described orthogonal signalling composition, so that each power level of described in-phase signal composition and described orthogonal signalling composition is identical.
18. wireless transmission/receive unit according to claim 10, wherein said digital compensation module comprises digit phase imbalance compensation module, described digit phase imbalance compensation module has two signal inputs that comprise in-phase signal composition and orthogonal signalling composition, and described digit phase imbalance compensation module is configured to adjust the phase place of described in-phase signal composition and described orthogonal signalling composition, so that each phase place of described in-phase signal composition and described orthogonal signalling composition is orthogonal.
19. an integrated circuit comprises:
The artificial antenna conveyer, described artificial antenna conveyer comprises:
Power amplifier,
Modulator, and
Temperature inductor is in order to monitor the temperature reading that is associated with described artificial antenna conveyer;
Internal memory comprises a plurality of look-up table LUT, gain and the phase property of the described power amplifier of described a plurality of look-up table stores; And
A plurality of digital compensation modules, described a plurality of digital compensation modules comprise:
Digital DC DC migration module, described digital DC migration module has two signal inputs that comprise homophase (I) signal component and quadrature (Q) signal component, and described digital DC migration module is configured to proofread and correct the carrier leak that is associated with described modulator;
Power detector, this power detector is configured to:
Definite minimum detection reading that is associated with each described signal input; With
Determine first and second DC migration numerical value based on the described minimum detection reading of interpolation; And
Described digital DC DC migration module is configured to adjust based on described first and second DC migration numerical value the DC level separately of described two signals input, wherein by select the one among described a plurality of look-up table LUT to come to be at least one setting compensation parameter in the described compensating module based on described temperature reading.
20. integrated circuit according to claim 19, wherein said artificial antenna conveyer also comprises:
The bias current inductor, be used for monitoring the bias current reading that is associated with described artificial antenna conveyer, wherein by select the one among described a plurality of look-up table LUT to come to be at least one setting compensation parameter in the described digital compensation module based on described bias current reading.
21. integrated circuit according to claim 19 is characterized in that, described digital compensation module comprises the digital pre-distortion compensating module.
22. integrated circuit according to claim 21, wherein said digital pre-distortion compensating module has two signal inputs that comprise in-phase signal composition and orthogonal signalling composition, and described digital pre-distortion compensating module is configured to based on the gain of described power amplifier stored in the selected look-up table and phase property and makes phase place and the amplitude distortion of described in-phase signal composition and described orthogonal signalling composition, so that described power amplifier produces linear response, but not the distortion response.
23. integrated circuit according to claim 19, wherein said digital compensation module comprises the digital pre-distortion compensating module, and described digital pre-distortion compensating module has two signal inputs that comprise homophase input and quadrature input, and described integrated circuit also comprises:
Low pass filter is coupled to each described homophase input and the input of described quadrature of described digital pre-distortion compensating module.
24. integrated circuit according to claim 23, wherein said low pass filter is root raised cosine filter.
25. integrated circuit according to claim 19, wherein said modulator have regional oscillator frequency, in order to determine described minimum detection reading.
26. integrated circuit according to claim 19, wherein said digital compensation module comprises digital amplitude imbalance compensation module, described digital amplitude imbalance compensation module has two signal inputs that comprise in-phase signal composition and orthogonal signalling composition, and described digital amplitude imbalance compensation module is configured to adjust one of them power level of described in-phase signal composition and described orthogonal signalling composition, so that each power level of described in-phase signal composition and described orthogonal signalling composition is identical.
27. integrated circuit according to claim 19, wherein said digital compensation module comprises digit phase imbalance compensation module, described digit phase imbalance compensation module has two signal inputs that comprise in-phase signal composition and orthogonal signalling composition, and described digit phase imbalance compensation module is configured to adjust the phase place of described in-phase signal composition and described orthogonal signalling composition, so that each phase place of described in-phase signal composition and described orthogonal signalling composition is orthogonal.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US47631403P | 2003-06-06 | 2003-06-06 | |
| US60/476,314 | 2003-06-06 | ||
| US10/736,294 | 2003-12-15 | ||
| US10/736,294 US7133644B2 (en) | 2003-06-06 | 2003-12-15 | Digital baseband system and process for compensating for analog radio transmitter impairments |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004800138976A Division CN100444525C (en) | 2003-06-06 | 2004-05-10 | Digital baseband system and process for compensating for analog radio transmitter impairments |
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| CN101436868A CN101436868A (en) | 2009-05-20 |
| CN101436868B true CN101436868B (en) | 2013-03-27 |
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| CN2008101863313A Expired - Fee Related CN101436868B (en) | 2003-06-06 | 2004-05-10 | Digital baseband system for compensating for analog radio transmitter impairments |
| CNB2004800138976A Expired - Fee Related CN100444525C (en) | 2003-06-06 | 2004-05-10 | Digital baseband system and process for compensating for analog radio transmitter impairments |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105515533A (en) * | 2015-11-12 | 2016-04-20 | 中国电子科技集团公司第四十一研究所 | Digital IQ real-time compensation method based on look-up table |
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|---|---|---|---|---|
| US9778902B2 (en) * | 2011-10-27 | 2017-10-03 | Intel Corporation | Software digital front end (SoftDFE) signal processing |
| CN102938650A (en) * | 2012-11-09 | 2013-02-20 | 华为技术有限公司 | Signal compensation method, serializer and deserializer |
| US8855588B2 (en) * | 2012-12-19 | 2014-10-07 | Mstar Semiconductor, Inc. | Power amplifying apparatus and wireless signal transmitter utilizing the same |
| CN105162459B (en) * | 2015-09-08 | 2018-06-29 | 四川九洲电器集团有限责任公司 | A kind of power calibrating method and system of DDS wideband signal sources |
| US11177847B2 (en) * | 2019-03-22 | 2021-11-16 | Mediatek Singapore Pte. Ltd. | Method for compensating for degradation of signal during transmission of the signal and transmitter utilizing the same |
| CN110943748B (en) * | 2019-11-08 | 2022-04-12 | 芯原微电子(上海)股份有限公司 | Automatic mismatch calibration circuit, radio frequency receiver system and method |
| CN111162782B (en) * | 2019-12-31 | 2021-09-21 | 京信网络系统股份有限公司 | Direct current calibration method, system, device and storage medium |
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| US6169463B1 (en) * | 1999-03-24 | 2001-01-02 | Philips Electronic North America Corp. | Quadrature modulator with set-and-forget carrier leakage compensation |
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| CN1152494C (en) * | 2002-08-01 | 2004-06-02 | 上海交通大学 | Analog orthogonal modulation unbalance compensating method |
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| US6313703B1 (en) * | 1998-06-19 | 2001-11-06 | Datum Telegraphic, Inc | Use of antiphase signals for predistortion training within an amplifier system |
| CN1359562A (en) * | 1999-02-22 | 2002-07-17 | 艾利森电话股份有限公司 | Radlo receiver and method for preloading an average dc-offset into a channel filter |
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| CN105515533A (en) * | 2015-11-12 | 2016-04-20 | 中国电子科技集团公司第四十一研究所 | Digital IQ real-time compensation method based on look-up table |
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| CN1809967A (en) | 2006-07-26 |
| CN101436868A (en) | 2009-05-20 |
| CN100444525C (en) | 2008-12-17 |
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