CN1868186A - Modulating apparatus and modulating method - Google Patents
Modulating apparatus and modulating method Download PDFInfo
- Publication number
- CN1868186A CN1868186A CN 200480030125 CN200480030125A CN1868186A CN 1868186 A CN1868186 A CN 1868186A CN 200480030125 CN200480030125 CN 200480030125 CN 200480030125 A CN200480030125 A CN 200480030125A CN 1868186 A CN1868186 A CN 1868186A
- Authority
- CN
- China
- Prior art keywords
- mentioned
- signal
- phase
- modulation
- modulating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
A modulating apparatus that need not use any huge reference tables, can be applied even to a conventional analog PLL modulation scheme, need not control timings with higher accuracy, can correct phase errors with a high accuracy, and that can be applied even to communication systems using no amplitude modulations. In the present apparatus, a signal generating part (101) generates a baseband phase signal. A phase error compensation part (102) multiplies a frequency change amount in a predetermined period or a phase change amount between adjacent data of the baseband phase signal by a parameter inherent in a device to determine a phase error, and then corrects the determined phase error for the baseband phase signal. A storage part (103) stores parameters and calculation formula. A modulation part (105) uses the baseband phase signal to modulate a frequency converted signal received from a frequency conversion part (104), thereby producing a modulated signal.
Description
Technical field
The present invention relates to modulating device and modulator approach, particularly baseband signal is carried out the modulating device and the modulator approach of phase error correction.
Background technology
In the mobile communication system in recent years, using various modulation demodulation systems, wherein the polar coordinate modulated mode is being arranged as the modulation system of paying attention to saving high efficiency wireless terminal power, that can expect.In the polar coordinate modulated mode, in the time of will sending baseband signal and be separated into amplitude component and phase component, the modulation frequency range expands to respect to sending more than 4 times of baseband signal symbol rate.Therefore, with the most widely used analog PLL modulation system in the present GSM mode, when being used in the phase modulation unit of polar coordinate modulated mode same as before, because PLL frequency range deficiency, when modulator is exported, can produce phase error, and become the reason of frequency spectrum generation distortion.
For this problem, send baseband signal by the compensation of expansion PLL frequency range, be suggested (for example patent documentation 1) with the technology of improving PLL modulator characteristic.Fig. 1 is the block diagram that expression improves the PLL modulating device summary of loop frequency range in the past.10 is PLL modulating devices among Fig. 1, the 11st, voltage-controlled oscillator (below be designated as " VCO "), the 13rd, frequency divider, the 15th, frequency division carrier signal, the 16th, with reference signal and frequency division the phase comparator that compares of the phase place of carrier signal 15, the 17th, the control signal of having exported from phase comparator 16, the 18th, be used for loop filter with the error signal planarization, the 19th, the control signal that has been flattened, the 21st, the digital processing unit that carries out characteristic compensation and filtering, the 22nd, filtering the digital modulation output signal, the 23rd, synthesizer, the 25th, through ovennodulation carrier signal, the 26th, digital sigma-delta modulating unit, the 27th, the control signal of having exported from digital sigma-delta modulating unit 26.
With above structure following action is described.Modulate at digital sigma-delta modulating unit 26, and then compare at phase comparator 16 and reference signal, and the control signal of output is flattened at loop filter 18, but this moment because the restriction of the band territory of loop filter 18, the radio-frequency component forfeiture of control signal.The difference of getting the characteristic of loop filter with desired frequency band and the actual loop filter 18 that uses thus is used as penalty function, in digital processing unit 21 these difference of digital modulation compensation data.As above, to be used for the loop filter 18 of reality of PLL modulating device 10 and the difference and the digital modulation data of characteristic that do not produce the desirable loop filter of phase error multiplies each other, can be in the generation that suppresses phase error, the loop frequency range of expansion PLL modulating device 10, and improve characteristic.
And then, the method of the phase error that modulator produces in the polar coordinate modulated mode by way of compensation, compensating circuit is set, and the amplitude component that above-mentioned compensating circuit is proofreaied and correct the polar coordinate modulated signal comes the method for compensation of phase error and device to be suggested (for example patent documentation 2).Fig. 2 is that expression is used polar coordinate modulated mode in the past and produced the figure of an example of linear modulation signal device.Among Fig. 2, use the polar coordinate modulated mode and the device 40 that produces linear modulation signal mainly comprises: digital waveform filter (FILTER) 41, digital signal processor (DSP) 42, compensating circuit (COMP) 43, D/A converter (D/A) 44, phase-modulator (PMOD) 45, power amplifier (PA) 46 and adjuster (REG) 47.
With the above following action of structure explanation.Digital waveform filter 41 will send data and be converted to digital waveform, and output to digital signal processor 42.The transmission data that digital signal processor 42 will have been imported from digital waveform filter 41 are separated into phase component and amplitude component, output to phase-modulator 45 and compensating circuit 43.Phase-modulator 45 obtains the modulation of constant-envelope phase of line by the phase component modulated carrier signal.At this moment, at phase-modulator 45, phase modulated carrier signal can produce phase error.
Provide linear modulation signal for proofreading and correct this phase error, compensating circuit 43 is proofreaied and correct the amplitude component of having imported from digital signal processor 42, and phase error that compensation is produced by phase-modulator 45.For example, compensating circuit 43, based on the delay, desired phase component and the distortion that produce at phase-modulator 45 phase component, draw penalty function and proofread and correct amplitude component.Then, the digital amplitude component that will proofread and correct of compensating circuit 43 outputs to D/A converter 44.
The calibrated digital amplitude component that D/A converter 44 will be imported is converted to analog signal, and outputs to adjuster 47.Adjuster 47 is based on the output signal of analog signal and power amplifier 46, and to power amplifier 46 outputs, this analog signal adjustment is controlled at the power of power amplifier 46 curtage of the signal of desired value with analog signal.Power amplifier 46 comes the power of control power amplifiers according to the analog signal of having imported, and modulates the carrier signal of having handled through phase modulated from phase-modulator 45 inputs thus, and the output amplifying signal.
According to such structure, can be in the communication system of using the polar coordinate modulated mode, the phase error of compensation of phase modulator improves modulation accuracy, and then can eliminate the distortion that phase error produces, and satisfies the spectrum requirement that sends signal.
And for example, the compensation technique of the distortion component of the frequency spectrum that produces as the characteristic degradation of following the PLL modulating unit can consider to be suitable for pre-distortion technology (for example patent documentation 3).Fig. 3 is a block diagram of representing pre-distortion device 60 summaries in the past.Among Wy Fig. 3, the 62nd, power calculation unit, the 63rd, the amplitude that calculates in power calculation unit 62, the 64th, the master meter of non-linear distortion compensation usefulness, the 65th, through the non-linear distortion offset data of orthogonal processing, the 66th, the non-linear distortion compensating unit, the 67th, with the digital orthogonal baseband signal of non-linear distortion compensation deals, the 68th, D/A converting unit (D/A), the 69th, analog quadrature based band signal, the 70th, the low pass filter (LPF) of band territory restriction usefulness, the 71st, with the analog quadrature based band signal of band territory restriction processing, the 72nd, quadrature modulation unit, the 73rd, modulation signal, the 74th, the amplifier of transmitting system.
With the above following action of structure explanation.At first, by power calculation unit 62, calculate the amplitude 63 that sends signal from sending the digital quadrature baseband signal.Next, with the amplitude 63 of the transmission signal that calculates as the master meter 64 of address with reference to non-linear distortion compensation usefulness, the non-linear distortion offset data of the non-linear distortion characteristic with transmitting system that calculated in advance is gone out obtains as the non-linear distortion offset data 65 through orthogonal processing.
Non-linear distortion compensating unit 66 carries out complex multiplication with digital orthogonal baseband signal with through the non-linear distortion offset data 65 of orthogonal processing, and non-linear distortion has been compensated digital orthogonal baseband signal 67 outputs.The digital orthogonal baseband signal 67 of non-linear distortion compensation is converted to analog signal by D/A converting unit 68, and is with the territory restriction, obtain analog quadrature based band signal 71 by low pass filter 70.Then, carry out quadrature modulation by quadrature modulation unit 72 and become after the modulation signal 73, the amplifier 74 by transmitting system is enlarged into required size, and output sends modulation signal.
As above, master meter 64, the non-linear distortion compensating unit 66 of power calculation unit 62, non-linear distortion compensation usefulness are set, compensate the master meter 64 of usefulness with reference to non-linear distortion according to the amplitude 63 of digital orthogonal baseband signal, with digital orthogonal baseband signal with through the complex multiplication of carrying out of the non-linear distortion offset data 65 of orthogonal processing, can compensate the non-linear distortion that amplifier produced of transmitting system by non-linear distortion compensating unit 66 thus.
No. 6008703 specification of [patent documentation 1] United States Patent (USP)
[patent documentation 2] Japanese patent application 2002-527921 communique
[patent documentation 3] Japan Patent 8-251246 communique
Summary of the invention
, in device in the past, the mode of loop frequency range that relates to expansion PLL compensates the technology of baseband signal, owing to can only be applicable to the digital sigma-delta modulation, has the problem that can't be suitable for analog PLL modulation system in the past.
And for example, in device in the past, compensating circuit is set, when the amplitude component of proofreading and correct the polar coordinate modulated signal by above-mentioned compensating circuit comes the compensation of phase error, need to use amplitude component for the phase error of compensation of phase modulator, therefore compensating circuit need postpone amplitude component in the identical time of the delay that phase-modulator produced.The adjustment of this time of delay can make the effect of phase error compensation be a greater impact, so there is the problem of control lag time accurately.And then, in the device in the past, when using the polar coordinate modulated mode, the synthetic timing adjustment of signal after the adjustment of the time of delay of compensating circuit and phase modulated and Modulation and Amplitude Modulation finish, at least need twice regularly adjustment, must adjust problem regularly accurately so exist.In addition, because need to use amplitude component in the device in the past for the phase error of compensation of phase modulator, so have the communication system that does not need amplitude-modulated modulation system for GSMK like that, problem that can't the compensation of phase error.
And then, when in device in the past, using pre-distortion technology, must prepare master meter, so the problem that exists master meter can become huge corresponding to each amplitude.
The present invention aims to provide a kind of modulating device and modulator approach, do not need to use huge master meter just can be suitable in the past analog PLL modulation system, and need not high-precision timing controlled phase calibration error accurately just, and also can use not carrying out amplitude-modulated communication system.
Modulating device of the present invention comprises: modulating unit, modulating baseband signal and generate modulation signal; And correcting unit, adjoin the phase changing capacity between data and the constant of regulation based on baseband signal, above-mentioned non-modulation baseband signal is carried out the processing of prior phase calibration error, this phase error be the non-modulation baseband signal before above-mentioned modulating unit carries out modulation treatment and carry out modulation treatment after modulating baseband signal between produce.
Modulator approach of the present invention comprises: modulating baseband signal generates the step of modulation signal; The constant of the regulation of adjoining phase changing capacity between data and storage of baseband signal is carried out multiplying, obtain to the non-modulation baseband signal of the baseband signal before modulating and be the step of the phase error between the modulating baseband signal of modulation back baseband signal; And the step of above-mentioned non-modulation baseband signal being proofreaied and correct in advance the phase error of being obtained.
According to the present invention, do not need to use huge master meter, just can be suitable for analog PLL modulation system in the past.And need not high-precision timing controlled, phase calibration error accurately just, and also can use not carrying out amplitude-modulated communication system.
Description of drawings
Fig. 1 is a block diagram of representing communication apparatus structure in the past;
Fig. 2 is a block diagram of representing communication apparatus structure in the past;
Fig. 3 is a block diagram of representing communication apparatus structure in the past;
Fig. 4 is the block diagram of the communication apparatus structure that relates to of expression embodiments of the present invention 1;
Fig. 5 is the figure of passage of time of the I component Wave data of the expression phase error that relates to of embodiments of the present invention 1 and baseband phase signal;
Fig. 6 is the block diagram of the communication apparatus structure that relates to of expression embodiments of the present invention 2;
Fig. 7 is the block diagram of the communication apparatus structure that relates to of expression embodiments of the present invention 3;
Fig. 8 is the block diagram of the communication apparatus structure that relates to of expression embodiments of the present invention 4;
Fig. 9 is the block diagram of the communication apparatus structure that relates to of expression embodiments of the present invention 5;
Figure 10 is the block diagram of the communication apparatus structure that relates to of expression embodiments of the present invention 6;
Figure 11 is the block diagram of the communication apparatus structure that relates to of expression embodiments of the present invention 7;
Figure 12 is the block diagram of the communication apparatus structure that relates to of expression embodiments of the present invention 8;
Figure 13 is the block diagram of the communication apparatus structure that relates to of expression embodiments of the present invention 9;
Figure 14 is the expression frequency variation that relates to of embodiments of the present invention 10 and the figure of parametric relationship.
Embodiment
Core of the present invention is: based on the frequency variation in the stipulated time of baseband signal, will be by the baseband signal before the modulating unit modulation and by after the modulating unit modulation and, to proofreading and correct in advance by the baseband signal before the modulating unit modulation by the phase error between the demodulating unit demodulated baseband signal.
Below the execution mode that present invention will be described in detail with reference to the accompanying.
(execution mode 1)
Fig. 4 is the block diagram of the communicator 100 that relates to of expression embodiments of the present invention 1.
Modulating device 112 comprises: phase error compensation unit 102, memory cell 103, frequency translation unit 104, modulating unit 105, phase comparison unit 106, LPF107 and VCO108.In addition, communicator 100 expression phase-locked loop (Phase-Locked Loop below is designated as " PLL ") modulating devices.
Phase error compensation unit 102 as correcting unit, when each baseband phase signal is imported from signal generation unit 101, phase changing capacity between the adjacent data that use is obtained from the frequency variation of the stipulated time that the baseband phase signal is obtained or from baseband signal, the calculating formula and the parameter of being stored with memory cell 103, calculate and be estimated as the phase error that the modulation treatment by baseband signal produces, the baseband phase signal of importing from signal generation unit 101 is proofreaied and correct the phase error of calculating, and output to modulating unit 105.In addition, the method for asking for phase error will be told about in the back.
Modulating unit 105, it for example is quadrature modulator, baseband phase signal after the correction that use has been imported from phase error compensation unit 102, to modulate and generate modulation signal from the frequency conversion signal that frequency translation unit 104 is imported, the modulation signal that generates will be outputed to phase comparison unit 106.
LPF107 will carry out filtering from the error signal of phase comparison unit 106 inputs, and output to VCO108.
VCO108 will will output to frequency translation unit 104 as modulated output signal by the vibration frequency of control signal decision from the error signal of LPF107 input as control signal, send via antenna 109 simultaneously.Finish modulation treatment by VCO108 output modulated output signal.
Next, with reference to the method for Fig. 5 explanation from the phase calibration error of the baseband phase signal of signal generation unit 101 outputs.Fig. 5 is the passage of time of I component (synchronized component) the Wave data # 202 of expression phase error # 201 and baseband phase signal.
At communicator 100, because LPF107 etc. has frequency characteristic, the frequency range of communicator 100 is to abundant when wide from the maximum frequency component that modulated output signal had of VCO108 output, the frequency characteristic of communicator 100 does not become problem, but the frequency range of communicator 100 is to the maximum frequency component that modulated output signal had when wide inadequately, according to the frequency characteristic of communicator 100, the modulated output signal of exporting from VCO108 can produce phase error Δ θ.
Fig. 5 is that expression will be made as 270.833ksymb/s from the symbol rate of the baseband phase signal of signal generation unit 101 output, when the loop frequency range is made as about 1MHz, be Δ θ to the phase error of the Wave data modulated output signal of the synchronized component of baseband phase signal.As shown in Figure 5, phase error Δ θ becomes bigger at the Wave data of baseband phase signal point jumpy.Herein, phase error Δ θ is the baseband phase signal (non-modulation baseband signal) before the modulation and modulated output signal is carried out poor between the signal (modulating baseband signal) of demodulation.Even guarantee 4 times loop band as shown in Figure 5, still produce the phase error about ± 13 degree approximately.Therefore at receiving terminal for data are carried out demodulation with degree of precision, phase error compensation unit 102 needs phase calibration error delta θ so that make the phase signal of modulated output signal identical with the baseband phase signal.
The variation of baseband phase signal can be represented with the frequency variation of unit interval, so the frequency variation of phase error and unit interval can be represented with the relational expression of formula (1).
Δθ＝α·F (1)
Wherein, Δ θ: phase error
α: parameter
F: frequency variation
Herein, parameter alpha is the coefficient that the characteristic according to communicator 100 determines.Formula (1) expression if know the frequency variation F of the unit interval of baseband phase signal, then can be inferred out the phase error Δ θ that produces according to communicator 100.
Next, the phase mass θ of each data of baseband phase signal and the relation between the frequency variation F of unit interval are described.As considering to carry out the data rows of the baseband phase signal of discretization processing, then there is the relation of formula (2) in n-1 data (for example n-1 frame) and n the data (for example n frame) herein, in phase error compensation unit 102.
F(n-1)＝(θ(n)-θ(n-1))/(2·π·t) (2)
Wherein, F (n-1): according to n-1 data and n the frequency component that data decide
θ (n): the phase mass of n data
θ (n-1): the phase mass of n-1 data
T: the time difference between each data of baseband phase signal
And then, using the frequency component that determines according to n data and n+1 data (for example n+1 frame), through type (3) can be obtained the frequency variation of the unit interval of n data.
F(n)＝(F(n)-F(n-1))/t
＝(θ(n+1)+θ(n-1)-2·θ(n)/(2·π·t
2) (3)
Wherein, F (n): the frequency variation of the unit interval of n data
F (n): according to n data and n+1 the frequency component that data determine
F (n-1): according to n-1 data and n the frequency component that data determine
θ (n+1): the phase mass of n+1 data
θ (n-1): the phase mass of n-1 data
θ (n): the phase mass of n data
T: the time difference between each data of baseband phase signal
Formula (3) expression can be converted to frequency variation from the phase changing capacity between adjacent data.That is, to the phase mass θ (n) of n data, if know the phase mass θ (n-1) of previous data and the phase mass θ (n+1) of back data, then the frequency variation F (n) of the unit interval of n data can be derived by simple calculating.Therefore, can use frequency variation and the parameter obtained from phase changing capacity, obtain phase error by formula (1).And for example, to n data, can be from the phase mass of n-1 data and n+1 data, obtain the frequency variation F of the unit interval of n data, and then can be from formula (1) and formula (3), as the formula (4), can derive the phase mass and the relational expression between the phase error of these data of n data.
Δθ(n)＝α·(θ(n+1)+θ(n-1)-2·θ(n))/(2·π·t
2) (4)
Wherein, Δ θ (n): n the phase error that data are suffered
α: parameter
(n+1): the phase mass of n+1 data
θ (n-1): the phase mass of n-1 data
θ (n): the phase mass of n data
T: the time difference between each data of baseband phase signal
Thus, through type (4) can be inferred n the phase error Δ θ (n) that data are suffered, so use the phase mass θ (n) of n data can obtain the phase error Δ θ (n) that through type (4) is inferred, by phase error compensation unit 102, to n data phase calibration error delta θ (n), then recoverable is from the phase error Δ θ of the modulated output signal of n data of VCO108 output as in advance.Get final product through type (4), obtain the phase error Δ θ (n) of n data according to the phase changing capacity between adjacent data and parameter.
Herein, 103 stored parameters of memory cell, before the beginning data communication, can will carry out subtraction with the phase place of the modulated output signal of exporting from VCO108 by the phase place of the baseband signal before modulating unit 105 modulation, obtain phase error thus, through type (1) is obtained the phase error of obtaining divided by the frequency variation of stipulated time then.
According to above-mentioned, based on the constant of phase changing capacity between adjacent data and regulation and when asking phase error, use formula (4); Based on the constant of the frequency variation of stipulated time and regulation and when asking phase error, use formula (1).And for example, based on the constant of phase changing capacity between adjacent data and regulation and when asking phase error, 103 stored parameters of memory cell can be before the beginning data communication, obtain phase error by carrying out subtraction with the phase place of the modulated output signal of exporting from VCO108 by the phase place of the baseband signal before modulating unit 105 modulation, through type (4) is obtained the phase error of trying to achieve also passable divided by the phase changing capacity between adjacent data then.Thus, not frequency of utilization variable quantity and phase calibration error.
As mentioned above, according to present embodiment 1, the parameter of at first storing the frequency variation of stipulated time of baseband phase signal or the phase changing capacity between adjacent data and obtaining by phase error, each data of baseband phase signal are obtained the frequency variation of stipulated time or the phase changing capacity between adjacent data, frequency variation that use is simultaneously obtained or phase changing capacity and stored parameters are inferred phase error, the baseband phase signal is proofreaied and correct the phase error of inferring in advance phase calibration error so can only use the baseband phase signal.Thus, do not need to use huge master meter, just go for analog PLL modulation system in the past, can be with degree of precision phase calibration error need not high-precision timing controlled, and can be used in and not carry out the communication system that Modulation and Amplitude Modulation is handled.In addition, according to present embodiment 1, because phase error can use the calculating formula of the regulation of storage to calculate, so can obtain phase error with simple method.
(execution mode 2)
Fig. 6 is the block diagram of communicator 300 structures that relate to of expression embodiments of the present invention 2.
Modulating device 302 comprises: memory cell 103, frequency translation unit 104, modulating unit 105, phase comparison unit 106, LPF107, VCO108 and signal generation unit 301.
The communicator 300 that present embodiment 2 relates to, the communicator 100 with respect to execution mode shown in Figure 41 relates to as shown in Figure 6, removes phase error compensation unit 102, uses signal generation unit 301 to replace signal generation unit 101.In addition, marking identical number with the part of Fig. 4 same structure among Fig. 6, and omitting its explanation.
Signal generation unit 301 is can be by Digital Signal Processing for example and DSP (the Digital signal processor of phase calibration error, digital signal processor), signal generation unit 301 generates the baseband phase signal, calculating formula and the parameter of using the frequency variation obtained from the baseband phase signal that generates and memory cell 103 to be stored simultaneously calculate phase error, the baseband phase signal of having imported from signal generation unit 301 is carried out treatment for correcting with the phase error of calculating, and output to modulating unit 105.In addition, the method for obtaining phase error is identical with above-mentioned execution mode 1, therefore omits its explanation.
As mentioned above, according to present embodiment 2, except that the effect of above-mentioned execution mode 1, the correction of the phase error that can also carry out with the generation of baseband phase signal with to the baseband phase signal, undertaken by continuous Digital Signal Processing, so can make the processing high speed of phase error.
(execution mode 3)
Fig. 7 is the block diagram of communicator 400 structures that relate to of expression embodiments of the present invention 3.
The communicator 400 that present embodiment 3 relates to, the communicator 100 with respect to execution mode shown in Figure 41 relates to as shown in Figure 7, has modulating unit 401 and replaces modulating unit 105, has phase comparison unit 402 and replaces phase comparison unit 106.In addition, among Fig. 7, marking identical number with the part of Fig. 4 same structure, and omitting its explanation.
As mentioned above, according to present embodiment 3, the parameter of at first storing the frequency variation of stipulated time of baseband phase signal or the phase changing capacity between adjacent data and obtaining by phase error, each data of baseband phase signal are obtained the frequency variation of stipulated time or the phase changing capacity between adjacent data, frequency variation that use is simultaneously obtained or phase changing capacity and stored parameters are inferred phase error, the baseband phase signal is proofreaied and correct the phase error of inferring in advance phase calibration error so can only use the baseband phase signal.Thus, do not need to use huge master meter, just go for analog PLL modulation system in the past, can be with degree of precision phase calibration error need not high-precision timing controlled, and can be used in and not carry out the communication system that Modulation and Amplitude Modulation is handled.In addition, according to present embodiment 3, because phase error can use the calculating formula of the regulation of storage to calculate, so can obtain phase error with simple method.
(execution mode 4)
Fig. 8 is the block diagram of communicator 500 structures that relate to of expression embodiments of the present invention 4.
The communicator 500 that present embodiment 4 relates to, communicator 100 with respect to execution mode shown in Figure 41 relates to as shown in Figure 8, removes memory cell 103, have phase error compensation unit 502 and replace phase error compensation unit 102, and appended demodulating unit 501.In addition, among Fig. 8, marking identical number with the part of Fig. 4 same structure, and omitting its explanation.
Demodulating unit 501 will carry out demodulation and generate baseband phase signal (demodulated base band signal) from the modulated output signal of VCO108 input, and the baseband phase signal that generates is outputed to phase error compensation unit 502.But demodulating unit 501 is the demodulating unit of the receiving system of double as demodulated received signal both, also can be provided with respectively with the demodulating unit of receiving system.
Phase error compensation unit 502, to carry out subtraction and obtain phase error from baseband phase signal before the modulation of signal generation unit 101 input and baseband phase signal after the modulation of demodulating unit 501 inputs, and use the phase error obtained and obtain parameter alpha by frequency variation or phase changing capacity that the baseband phase signal before modulating is obtained.Then, frequency variation that phase error compensation unit 502 will be obtained from the baseband phase signal or phase changing capacity and parameter alpha are carried out multiplication and are calculated and calculate phase error, the baseband phase signal of importing from signal generation unit 101 is proofreaied and correct the phase error that calculates, and output to modulating unit 105.In addition, after the demodulation of baseband phase signal, phase difference between the baseband phase signal after baseband phase signal before the modulation of obtaining by phase error compensation unit 502 and the modulation, phase error for the signal that transmitted, phase error when therefore continuing transmission signals, can obtain parameter alpha by the baseband phase signal after baseband phase signal before modulating and the modulation, and obtain according to formula (1).Thus, can obtain correct phase error.
Therefore as mentioned above,, except that the effect of above-mentioned execution mode 1, demodulated output signal is carried out demodulation, all calculate parameter alpha at every turn, can obtain correct parameter alpha at transmitting terminal according to present embodiment 4, but very high degree of precision ground phase calibration error thus.In addition,, when demodulating unit 501 double as are received the demodulating unit of system, do not need to change circuit scale according to present embodiment 4, just can very high degree of precision ground phase calibration error, the while can be carried out phase error compensation in real time by easy circuit structure.In addition, according to present embodiment 4, because stored parameter α in advance, so can reduce the memory capacity of memory cell (memory).
In addition, in the present embodiment 4, all obtain parameter alpha in phase error compensation unit 502 at every turn, but be not limited only to this, the memory cell of storing the parameter alpha of obtaining also can be set,, all use stored parameters α to calculate phase error up to through till the stipulated time.
(execution mode 5)
Fig. 9 is the block diagram of communicator 600 structures that relate to of expression embodiment of the present invention 5.Modulating device 603 comprises: phase error compensation unit 102, memory cell 103, frequency translation unit 104, modulating unit 105, phase comparison unit 106, LPF107, VCO108, amplitude control unit 601 and power amplifier 602.In addition, communicator 600 is the polar loop modulating devices that are expressed as one of polar coordinate modulated mode.
The communicator 600 that present embodiment 5 relates to, the communicator 100 corresponding to execution mode shown in Figure 41 relates to as shown in Figure 9, has appended amplitude control unit 601 and power amplifier 602.In addition, mark identical number with the part of Fig. 4 same structure among Fig. 9, and omit its explanation.
Amplitude control unit 601, according to the baseband amplitudes signal from 101 inputs of signal generation unit, control puts on the amplitude control voltage of power amplifier 602 so that the power of power amplifier 602 becomes desired value.
As mentioned above, according to present embodiment 5, except that the effect of above-mentioned execution mode 1, also applicable to carrying out amplitude-modulated modulating device, simultaneously carrying out amplitude-modulated modulating device, owing to can under the state that does not use the baseband amplitudes signal, come the phase calibration error,, just can obtain phase error with degree of precision so do not need to carry out high-precision timing adjustment based on the baseband phase signal.
(execution mode 6)
Figure 10 is the block diagram of communicator 700 structures that relate to of expression embodiment of the present invention 6.
Phase error compensation unit 703 is when the baseband phase signal is from 701 inputs of signal generation unit at every turn, calculating formula and parameter that use is stored from the frequency variation of the stipulated time that the baseband phase signal is obtained or the phase changing capacity between adjacent data and memory cell 702, calculate phase error, the baseband phase signal of importing from signal generation unit 701 is proofreaied and correct the phase error of calculating, and output to modulating unit 704.
Radio-cell 705 will be from the modulated output signal of modulating unit 704 input from fundamental frequency be handled to wireless frequency through up-conversion etc., and is sent via antenna 706.In addition, when modulating unit 704 was made of direct quadrature modulator etc., the upconversion process from the fundamental frequency to the wireless frequency also can be carried out simultaneously at modulating unit 704 and modulation.At this moment, just do not needed radio-cell 705.
As mentioned above, according to present embodiment 6, the parameter of at first storing the frequency variation of stipulated time of baseband phase signal or the phase changing capacity between adjacent data and obtaining by phase error, each data of baseband phase signal are obtained the frequency variation of stipulated time or the phase changing capacity between adjacent data, frequency variation that use is simultaneously obtained or phase changing capacity and stored parameters are inferred phase error, the baseband phase signal is proofreaied and correct the phase error of inferring in advance phase calibration error so can only use the baseband phase signal.Thus, do not need to use huge master meter, just go for analog PLL modulation system in the past, can be with degree of precision phase calibration error need not high-precision timing controlled, and can be used in and not carry out amplitude-modulated communication system.In addition, according to present embodiment 1, because phase error can use the calculating formula of the regulation of storage to calculate, so can obtain phase error with simple method.
(execution mode 7)
Figure 11 is the block diagram of communicator 800 structures that relate to of expression embodiment of the present invention 7.
Modulating device 802 comprises: memory cell 702, modulating unit 704 and signal generation unit 801.
The communicator 800 that present embodiment 7 relates to, the communicator 700 corresponding to execution mode shown in Figure 46 relates to as shown in figure 11, has removed phase error compensation unit 703, possesses signal generation unit 801 and replaces signal generation unit 701.In addition, mark identical number with the part of Figure 10 same structure among Figure 11, and omit its explanation.
Signal generation unit 801 is such as being DSP by Digital Signal Processing recoverable phase error, generate the baseband phase signal, use calculating formula and the parameter of being stored to calculate phase error simultaneously from the frequency variation of the stipulated time that the baseband phase signal that has generated is obtained or the phase changing capacity between adjacent data and memory cell 702, after the baseband phase signal proofreaied and correct the phase error of calculating, through the D/A conversion process, output to modulating unit 704.In addition, the method for trying to achieve phase error is identical with above-mentioned execution mode 1, so omit its explanation.
As mentioned above, according to present embodiment 7, except that the effect of above-mentioned execution mode 6, also can be with the generation of baseband phase signal with for the correction of the phase error of baseband phase signal, undertaken by continuous Digital Signal Processing, so can seek the high speed of phase calibration Error processing.
In addition, in the present embodiment 7, got well parameter in memory cell 702 storage in advance, but be not limited only to this, also can all the predetermined timing of baseband signal output have been obtained this parameter at every turn by signal generation unit 801.
(execution mode 8)
Figure 12 is the block diagram of communicator 900 structures that relate to of expression embodiment of the present invention 8.
The communicator 900 that present embodiment 8 relates to, communicator 700 corresponding to execution mode shown in Figure 10 6 relates to as shown in figure 12, has removed memory cell 702, possess phase error compensation unit 902 and replace phase error compensation unit 703, and appended demodulating unit 901.In addition, mark identical number with the part of Figure 10 same structure among Figure 12, and omit its explanation.
Demodulating unit 901 will carry out demodulation from the modulated output signal of modulating unit 704 inputs and generate the baseband phase signal, and the baseband phase signal that generates will be outputed to phase error compensation unit 902.But demodulating unit 901 both double as carries out the demodulating unit of demodulated received system with received signal, also can be provided with respectively with the demodulating unit of receiving system.
Phase error compensation unit 902, to carry out subtraction from baseband phase signal before the modulation of signal generation unit 701 input and baseband phase signal after the modulation of demodulating unit 901 inputs and obtain phase error, use the phase error obtained and the frequency variation of stipulated time of being obtained by the baseband phase signal before the modulation or the phase changing capacity between adjacent data are obtained parameter alpha.Then, frequency variation that phase error compensation unit 902 will be obtained from the baseband phase signal or phase changing capacity and parameter alpha are carried out multiplication and are calculated and calculate phase error, the baseband phase signal of importing from signal generation unit 701 is proofreaied and correct the phase error of calculating, and output to modulating unit 704.
As mentioned above,, except that the effect of above-mentioned execution mode 6, demodulated output signal is carried out demodulation, all calculate parameter alpha at every turn at transmitting terminal according to present embodiment 8, therefore can be in the hope of correct parameter alpha, but very high degree of precision ground phase calibration error thus.In addition,, when demodulating unit 901 double as are received the demodulating unit of system, do not need to change circuit scale according to present embodiment 8, just can very high degree of precision ground phase calibration error, the while can be carried out phase error compensation in real time by easy circuit structure.
In addition, in the present embodiment 8, all obtain parameter alpha in phase error compensation unit 902 at every turn, but be not limited only to this, the memory cell of storing the parameter alpha of obtaining also can be set,, all use stored parameters α to calculate phase error up to through till the stipulated time.
(execution mode 9)
Figure 13 is the block diagram of communicator 1000 structures that relate to of expression embodiment of the present invention 9.
Modulating device 1004 comprises: memory cell 702, phase error compensation unit 703, modulating unit 704, amplitude control unit 1001, radio-cell 1002 and power amplifier 1003.In addition, communicator 1000 is expression EER (Envelope Elimination and Restoration, envelope eliminate and regeneration) modulating devices.
The communicator 1000 that present embodiment 9 relates to, the communicator 700 corresponding to execution mode shown in Figure 10 6 relates to as shown in figure 13, has appended amplitude control unit 1001 and power amplifier 1003, possesses radio-cell 1002 and comes instead of wireless unit 705.In addition, mark identical number with the part of Figure 10 same structure among Figure 13, and omit its explanation.
Amplitude control unit 1001 is by the baseband amplitudes signal from 701 inputs of signal generation unit, and control puts on the amplitude control voltage of power amplifier 1003 so that make the power of power amplifier 1003 become desired value.
Radio-cell 1002 will be from the modulated output signal of modulating unit 704 input, handles to wireless frequency through up-conversion etc. from fundamental frequency, and outputs to power amplifier 1003.
Power amplifier 1003 will amplify based on the control of amplitude control unit 1001 from the modulation signal of radio-cell 1002 inputs, and exports as modulated output signal.In addition, because the method for phase calibration error is identical with above-mentioned execution mode 1, omit its explanation.
As mentioned above, according to present embodiment 9, except that the effect of above-mentioned execution mode 6, also applicable to carrying out amplitude-modulated modulating device, simultaneously carrying out amplitude-modulated modulating device, owing to can under the state that does not use the baseband amplitudes signal, come the phase calibration error,, just can obtain phase error with degree of precision so do not need to carry out high-precision timing adjustment based on the baseband phase signal.
(execution mode 10)
Figure 14 is that expression is preserved the phase error that parameter alpha that embodiments of the present invention 10 relate to and frequency variation are associated and selected chart with information.In addition, the structure of communicator is identical with Fig. 4, so omit its explanation.
Phase error compensation unit 102, each when the baseband phase signal when signal generation unit 101 is imported, all use from the frequency variation of the stipulated time that the baseband phase signal is obtained or the phase changing capacity between adjacent data, select to select parameter by the phase error that reference memory cell 103 is stored with information, the parameter selected and frequency variation or phase changing capacity are carried out the phase error that multiplying is obtained, the baseband phase signal of importing from signal generation unit 101 is proofreaied and correct, and outputed to modulating unit 105.
When the frequency of utilization variable quantity was obtained phase error, phase error compensation unit 102 replaced the penalty function of formula (1) by the penalty function of use formula (5), can obtain the phase error corresponding to frequency variation.In the formula (5), parameter alpha is the function that the frequency variation F of unit interval is made as parameter.
Δθ＝α(F)·F (5)
Wherein, Δ θ: phase error
α (F): parameter
F: frequency variation
As mentioned above, according to present embodiment 10, except effect with above-mentioned execution mode 1, select to select parameter with reference to phase error by frequency of utilization variable quantity or phase changing capacity with information, therefore can also select phase error corresponding to frequency variation or phase changing capacity, thereby with degree of precision phase calibration error.
In addition, carry out the correction of phase error at communicator 100 in the present embodiment 10, but be not limited only to this, also applicable to carrying out the correction of phase error at communicator 300, communicator 400, communicator 600, communicator 700, communicator 800 or communicator 1000.
This specification is that the Japan Patent 2004-305807 according to Japan Patent 2003-362393 number of on October 22nd, 2003 application and application on October 20th, 2004 writes and forms.Its content all is contained in this as a reference.
Industrial applicibility
Particularly suitable of the present invention carries out modulating device and the modulation of phase error correction to baseband signal Method.
Claims (11)
1. modulating device comprises:
Modulating unit, modulating baseband signal generates modulation signal; And
Correcting unit, adjoin the phase changing capacity between data and the constant of regulation based on baseband signal, above-mentioned non-modulation baseband signal is carried out the processing of prior phase calibration error, this phase error be the non-modulation baseband signal before above-mentioned modulating unit carries out modulation treatment and carry out modulation treatment after modulating baseband signal between produce.
2. modulating device as claimed in claim 1, wherein, above-mentioned correcting unit is converted to above-mentioned phase changing capacity the frequency variation of stipulated time, and based on said frequencies variable quantity and above-mentioned constant, above-mentioned non-modulation baseband signal is carried out the processing of prior phase calibration error, this phase error be the non-modulation baseband signal before above-mentioned modulating unit carries out modulation treatment and carry out modulation treatment after modulating baseband signal between produce.
3. modulating device as claimed in claim 2 also comprises memory cell, stores by above-mentioned phase error and said frequencies variable quantity are carried out the above-mentioned constant that subtraction is obtained, wherein,
Above-mentioned correcting unit carries out multiplying by the above-mentioned constant that said frequencies variable quantity and said memory cells are stored and obtains above-mentioned phase error, and the above-mentioned phase error that will obtain is simultaneously proofreaied and correct in advance to above-mentioned non-modulation baseband signal.
4. modulating device as claimed in claim 2 also comprises memory cell, has the chart of preservation with the phase error selection usefulness information of said frequencies variable quantity and above-mentioned constant associated, wherein,
Above-mentioned correcting unit, above-mentioned non-modulation baseband signal is carried out the processing of prior phase calibration error, and this phase error is by using the said frequencies variable quantity and obtaining by selecting to carry out multiplying with selected above-mentioned constant of information and said frequencies variable quantity with reference to above-mentioned phase error.
5. modulating device as claimed in claim 2, also comprise demodulating unit, to generate above-mentioned modulating baseband signal through the baseband signal demodulation of above-mentioned modulating unit modulation treatment, wherein, above-mentioned correcting unit carries out division arithmetic with above-mentioned non-modulation baseband signal and the phase error through between the above-mentioned modulating baseband signal of above-mentioned demodulating unit demodulation process and above-mentioned phase changing capacity and obtains above-mentioned constant; Simultaneously, above-mentioned non-modulation baseband signal is carried out the processing of prior phase calibration error, this phase error is carried out multiplying with the above-mentioned constant obtained and said frequencies variable quantity and is obtained.
6. modulating device as claimed in claim 5, wherein,
Above-mentioned demodulating unit carries out demodulation with base band signal modulated and generates above-mentioned modulating baseband signal, simultaneously demodulated received signal.
7. modulating device as claimed in claim 1 comprises:
Phase comparison unit is obtained the phase place of above-mentioned modulating baseband signal and the phase error between reference signal phase;
The voltage-controlled oscillating unit generates the frequency of oscillation as modulated output signal, and this frequency of oscillation is that the control signal of the above-mentioned phase error signal obtained by above-mentioned phase comparison unit decides; And
Frequency translation unit, the frequency that the above-mentioned modulated output signal frequency inverted that will be generated by above-mentioned voltage-controlled oscillating unit is a reference signal;
Wherein, above-mentioned modulating unit uses the above-mentioned non-modulation baseband signal of being proofreaied and correct by above-mentioned correcting unit, generates above-mentioned modulation signal by being modulated by the above-mentioned modulating baseband signal of said frequencies converting unit frequency inverted.
8. modulating device as claimed in claim 1, wherein,
Above-mentioned modulating unit uses the above-mentioned non-modulation baseband signal of being proofreaied and correct by above-mentioned correcting unit that carrier signal is modulated and generates above-mentioned modulation signal.
9. modulating device as claimed in claim 1 also comprises power amplification unit, and described power amplification unit amplifies above-mentioned modulation signal so that power becomes desired value in the above-mentioned modulation signal amplitude of control, and exports via antenna as the signal that sends.
10. a communicator has modulating device, and wherein, above-mentioned modulating device comprises:
Modulating unit, modulating baseband signal generates modulation signal; And
Correcting unit, adjoin the phase changing capacity between data and the constant of regulation based on baseband signal, above-mentioned non-modulation baseband signal is carried out the processing of prior phase calibration error, this phase error be the non-modulation baseband signal before above-mentioned modulating unit carries out modulation treatment and carry out modulation treatment after modulating baseband signal between produce.
11. a modulator approach comprises:
Modulating baseband signal generates the step of modulation signal;
The constant of the regulation of adjoining phase changing capacity between data and storage of baseband signal is carried out multiplying, obtain to the non-modulation baseband signal of the baseband signal before modulating and be the step of the phase error between the modulating baseband signal of modulation back baseband signal; And
Above-mentioned non-modulation baseband signal is proofreaied and correct in advance the step of the phase error of being obtained.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP362393/2003 | 2003-10-22 | ||
| JP2003362393 | 2003-10-22 | ||
| JP305807/2004 | 2004-10-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1868186A true CN1868186A (en) | 2006-11-22 |
Family
ID=37426209
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200480030125 Pending CN1868186A (en) | 2003-10-22 | 2004-10-21 | Modulating apparatus and modulating method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1868186A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101611554B (en) * | 2007-02-14 | 2013-06-19 | 日本电气株式会社 | Phase noise correction device and its method |
| CN107084662A (en) * | 2017-04-12 | 2017-08-22 | 合肥工业大学 | Orthogonal signalling real-time processing method based on FPGA |
| CN110290090A (en) * | 2019-07-09 | 2019-09-27 | 南京航空航天大学 | A kind of modulation of time-amplitude phase combining and demodulation method |
-
2004
- 2004-10-21 CN CN 200480030125 patent/CN1868186A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101611554B (en) * | 2007-02-14 | 2013-06-19 | 日本电气株式会社 | Phase noise correction device and its method |
| CN107084662A (en) * | 2017-04-12 | 2017-08-22 | 合肥工业大学 | Orthogonal signalling real-time processing method based on FPGA |
| CN110290090A (en) * | 2019-07-09 | 2019-09-27 | 南京航空航天大学 | A kind of modulation of time-amplitude phase combining and demodulation method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10938351B2 (en) | Envelope tracking system | |
| CN100336313C (en) | Peak power and envelope magnitude regulators and CDMA transmitters featuring such regulators | |
| CN1218474C (en) | Power modulation systems and methods that separately amplify low and high frequency portions of an amplitude waveform | |
| CN1233101C (en) | Control device and control method for transmission output of sudden transmitter | |
| CN1252910C (en) | Communications systems | |
| CN1270492C (en) | Device and method of pre-distorsion for compensating power amplifier | |
| CN1118945C (en) | Radio transmitter and radio communication method | |
| CN1701505A (en) | Modulator and correction method thereof | |
| CN1661928A (en) | Distortion compensation circuit, power amplifier using distortion compensation circuit, and distortion compensation signal generating method | |
| CN1674449A (en) | Transmitter | |
| CN1389987A (en) | Analogue quadrature moducator error compensating apparatus and method | |
| CN1853351A (en) | Amplifier circuit and amplifying method | |
| CN1208528A (en) | Transmitter | |
| CN1682436A (en) | Amplification device | |
| CN101064519A (en) | Transmission circuit, and communication apparatus using the same | |
| CN1870614A (en) | Universal device for predistortion processing base band digital signal | |
| CN1977459A (en) | Transmission apparatus, communication apparatus and mobile radio apparatus | |
| CN1578284A (en) | Digital pre-distortion for the linearization of power amplifiers with asymmetrical characteristics | |
| CN1701521A (en) | Transmission device and adjustment method thereof | |
| CN1943121A (en) | Transmitter and radio communication device | |
| CN1272902C (en) | Distortion compensator | |
| CN1667968A (en) | Transmitter and transceiver | |
| CN1318932A (en) | Portable radio system, portable radio device for it and frequency error predicting method | |
| CN1547820A (en) | Mobile station, base station, communication system, and communication method | |
| CN1692558A (en) | Transmitting method and transmitter apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20061122 |