CN102594764A - Method for restraining peak-to-average power ratio based on pulse regeneration, and intermediate frequency peak clipping module - Google Patents
Method for restraining peak-to-average power ratio based on pulse regeneration, and intermediate frequency peak clipping module Download PDFInfo
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- CN102594764A CN102594764A CN2012100599108A CN201210059910A CN102594764A CN 102594764 A CN102594764 A CN 102594764A CN 2012100599108 A CN2012100599108 A CN 2012100599108A CN 201210059910 A CN201210059910 A CN 201210059910A CN 102594764 A CN102594764 A CN 102594764A
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Abstract
The invention provides a method for restraining peak-to-average power ratio based on pulse regeneration, and an intermediate frequency peak clipping module for implementing the method. The method comprises the following steps: simply limiting the amplitude of a signal at an intermediate frequency, enabling the part which exceeds a threshold value to generate a noise signal; next, filtering the noise signal in a modulating-demodulating way, thereby realizing a better filtering effect with lower cost; at last, modulating the noise signal to the intermediate frequency and performing pulse cancellation to the noise signal and an initial signal, thereby realizing amplitude limited peak clipping, so that the peak-to-average power ratio of a plurality of carriers is reduced. The method for restraining peak-to-average power ratio based on pulse regeneration and the intermediate frequency peak clipping module accomplish peak clipping work of intermediate-frequency signals in a simple and efficiency way, and also take the system performance and resources in consideration.
Description
Technical field
The invention belongs to communication technical field, particularly a kind of peak clipping technology that reduces peak-to-average power ratio.
Background technology
Present many wireless communication systems; Like broadband CDMA system (WCDMA), worldwide interoperability for microwave connecting system (WiMAX); Its intermediate-freuqncy signal is formed by the addition of a plurality of independently baseband signal usually; Synthetic intermediate-freuqncy signal has bigger peak-to-average power ratio, and (Peak to Average Power Ratio PAPR), and meets Gaussian distribution.Power amplifier (PA) is a kind of at the widely used nonlinear device of communication system; Be characterized in exceeding its linear zone when input signal amplitude; Output will produce nonlinear distortion; Cause signal inband distortion and adjacent band signal to disturb, therefore must input signal amplitude be controlled in its linear zone.And the working range of the PA of the intermediate-freuqncy signal of big PAPR correspondence will be dwindled greatly, thereby causes the reduction of PA efficient.So the PAPR that before PA, reduces intermediate-freuqncy signal is very important.
Existing technology often can not reach good peak clipping effect.For example, because the adjustable frequency spectrum that causes of carrier wave is uncertain, though some peak clipping technology realizes simply can not reaching required adjacent channel leakage power ratio (ACLR) and Error Vector Magnitude (EVM).In addition, other method implementation procedure is complicated, and is a little less than the adjustment flexibility ratio, portable poor.
Summary of the invention
The present invention provides technical problem to be solved to be, provides a kind of and realizes easily, excellent performance, based on the method for restraining peak average power ratio and the intermediate frequency peak-clipping module of pulse regneration.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be, a kind of method for restraining peak average power ratio based on pulse regneration is characterized in that, may further comprise the steps:
Calculate the phase place and the amplitude mould value of the intermediate-freuqncy signal of current input,, then utilize the amplitude and the corresponding phase place generted noise signal that exceed the threshold value part when amplitude mould value surpasses threshold value;
The noise signal that generates is demodulated to base band falls sampling filter and handle, will fall noise signal behind the sampling filter again and carry out rising and be modulated to intermediate frequency after sampling filter is handled;
Original intermediate-freuqncy signal after the time-delay is deducted noise signal, obtain the intermediate-freuqncy signal after peak clipping is handled.
If intermediate-freuqncy signal is that the addition of multichannel baseband signal forms; When carrying out Filtering Processing, earlier noise signal is divided into and the identical multichannel of baseband signal quantity that forms original intermediate-freuqncy signal, be demodulated to base band by different local oscillation signals respectively; Falling sampling filter handles; To fall noise signal behind the sampling filter again and carry out rising and be modulated to intermediate frequency after sampling filter is handled, will be modulated to the noise signal phase adduction road of intermediate frequency at last, form the output of one road mid-frequency noise signal through different local oscillation signals.
For realizing the intermediate frequency peak-clipping module of said method, it is characterized in that, comprise that noise signal generation unit, filter unit, delay unit and pulse offset the unit; The input of intermediate frequency input signal input noise signal generation unit and the input of delay unit; The output of noise signal generation unit links to each other with the input of filter unit; The output of filter unit links to each other with the input that pulse offsets the unit; The output of delay unit links to each other with another input that pulse offsets the unit, and pulse offsets the output of unit and exports the intermediate-freuqncy signal after peak clipping is handled;
Said noise signal generation unit is used for, and calculates the phase place and the amplitude mould value of the intermediate-freuqncy signal of current input, when amplitude mould value surpasses threshold value, then utilizes the amplitude and the corresponding phase place generted noise signal that exceed the threshold value part;
Said filter unit is used for, and the noise signal that generates is demodulated to base band falls sampling filter and handle, and will fall noise signal behind the sampling filter again and carry out rising and be modulated to intermediate frequency after sampling filter is handled;
Said delay unit is used for, and input signal is carried out delay process, and the noise signal of the original input signal of feasible output and filter unit output is synchronous;
Said pulse offsets the unit and is used for, and the original intermediate-freuqncy signal after the time-delay is deducted noise signal, obtains the intermediate-freuqncy signal after peak clipping is handled.
Particularly; When the intermediate frequency peak-clipping module is applied to the adjustable multicarrier system of carrier wave; Said filter unit comprises some filtering subelements compositions; Filter unit is each the filtering subelement of noise signal input that generates, and said filtering subelement is demodulated to base band with the noise signal that generates and falls sampling filter and handle, and will fall noise signal behind the sampling filter and carry out rising and be modulated to intermediate frequency after sampling filter is handled; Filter unit closes the road with the mid-frequency noise signal plus after each filtering subelement output again, forms the output of one tunnel intermediate-freuqncy signal; The frequency that realizes demodulation, the employed local oscillation signal of modulation between each filtering subelement is different, and the number of filtering subelement is identical with the baseband signal quantity that forms original intermediate-freuqncy signal in the filter unit.
The present invention handles through signal being carried out simple clip at intermediate frequency, will exceed the part generted noise signal of threshold value; Again noise signal is carried out Filtering Processing through the mode of modulation, thereby obtain filter effect preferably with lower realization cost; Finally, noise signal is modulated onto intermediate frequency and primary signal again carries out pulse and offsets, and realizes the amplitude limit peak clipping, reduces the multicarrier peak-to-average power ratio.
The invention has the beneficial effects as follows, accomplish the peak clipping work of intermediate-freuqncy signal with mode simply and effectively, and take into account systematic function and resource.
Description of drawings
Fig. 1 is the structure chart of intermediate frequency peak-clipping module of the present invention.
Fig. 2 is the amplitude limit cell schematics of intermediate frequency peak-clipping module among the embodiment.
Fig. 3 is the filter unit sketch map of intermediate frequency peak-clipping module among the embodiment.
Embodiment
Embodiment comprises following step for the process that realizes the intermediate frequency peak clipping:
After step 1, baseband signal are modulated to intermediate frequency, input to the intermediate frequency peak-clipping module, the intermediate frequency peak-clipping module calculates the amplitude mould value and the phase place of intermediate-freuqncy signal;
Step 2, intermediate frequency peak-clipping module carry out simple clip to the signal mode value that calculates to be judged, if promptly the amplitude mould value of input signal has surpassed given threshold value, then calculates the part Δ x (n) above thresholding; If do not surpass this threshold values, then need not to limit it, that is to say that Δ x (n) is 0;
Step 3, intermediate frequency peak-clipping module are according to Δ x (n) and the phase place that calculates before, and the regenerated noise signal further, need carry out gain compensation to noise signal and obtain final noise signal x ' (n);
Corresponding this frame signal of base band of step 4, utilization (n) is separated noise signal x ' to be transferred to baseband signal, and falls the baseband noise that sampling filter obtains meeting spectrum requirement in base band;
The modulation of step 5, corresponding frame signal of baseband noise process through rising sampling, mixing, is modulated to intermediate frequency with noise signal successively again;
Step 6, the original intermediate-freuqncy signal that inputs to the intermediate frequency peak-clipping module through after the certain delay with corresponding the subtracting each other of filtered mid-frequency noise signal, can obtain the intermediate-freuqncy signal after peak clipping is handled.
As shown in Figure 1, the intermediate frequency peak-clipping module comprises that mainly noise signal generation unit, filter unit, delay unit and pulse offset the unit.The input of intermediate frequency input signal input noise signal generation unit and the input of delay unit; The output of noise signal generation unit links to each other with the input of filter unit; The output of filter unit links to each other with the input that pulse offsets the unit; The output of delay unit links to each other with another input that pulse offsets the unit, and pulse offsets the output of unit and exports the intermediate-freuqncy signal after peak clipping is handled.
The signal variable with carrier wave, that four road carrier waves are all inequality is embodiment.Baseband signal generates different local oscillation signals according to its different carrier frequency; Pass through base band demodulating, be modulated to the different intermediate-freuqncy signal of four road carrier waves, and synthetic one tunnel intermediate-freuqncy signal inputs to the intermediate frequency peak-clipping module.
After the noise signal generation unit receives the intermediate-freuqncy signal of input, a road synthetic intermediate-freuqncy signal is carried out simple clip judge.As shown in Figure 2, the noise signal generation unit mainly comprises computing unit, amplitude comparing unit and the pulse regneration computing unit of mould value and phase place.At first calculate the signal mode value and the signal phase of four tunnel synthetic intermediate-freuqncy signals.On the one hand, the signal mode value that calculates is compared with predefined peak value threshold value,, then obtain the difference of the two, will be designated as Δ x (n) above the part of thresholding if the signal mode value surpasses peak value threshold; If the signal mode value does not surpass peak value threshold, then need not to limit, can think that Δ x (n) is 0.On the other hand,, recalculate noise signal x ' (n), realize pulse regneration according to the Δ x (n) of gained and the signal phase that calculates the before entering pulse regneration computing unit of process certain time-delay.Preferably, for guaranteeing to disappear the peak effect, x ' (n) is carried out gain compensation.
Afterwards, noise signal x ' (n) gets into the different sub-filter unit of four road carrier waves respectively.Sub-filtration module structure chart is as shown in Figure 3, mainly comprises demodulation module and modulation module.Wherein, demodulation module and modulation module all can according to corresponding Base-Band Processing separate the mediation modulation design, and technology maturation, simplicity of design reduce the complexity of system.Adopt the local oscillation signal of baseband modulation and demodulation in the embodiment of the invention, each road signal(-) carrier frequency is all inequality, with the flexible control of the intermediate frequency peak-clipping module of realizing the multicarrier that carrier wave is adjustable.
With one road filter unit subunit is the example explanation.X ' (n) at first gets into demodulation module, carries out mixing and down-conversion Filtering Processing.Demodulator with x ' (n) with the local oscillation signal mixing, moving on the different frequencies, the local oscillation signal that when modulation, uses is by the local oscillation signal when the base band demodulating of delay process.Fall sampling processing and low-pass filtering treatment to what the output signal after multiplying each other adopted certain multiple then, why adopt that to fall sampling be from easy and the resource-effective angle consideration of realization of low pass filter, so that obtain meeting the baseband noise of spectrum requirement.Then, this noise signal gets into modulation module, is modulated to intermediate frequency again.In like manner, modulation module and baseband modulator are basic identical, and signal carries out the liter sampling and the Filtering Processing of corresponding multiple, and local oscillation signal last and that demodulation module is adopted carries out Frequency mixing processing.At this moment,, can guarantee that the noise intermediate-freuqncy signal of gained satisfies spectrum requirement on frequency domain through after the Filtering Processing, ready for reducing peak-to-average power ratio simultaneously.
At last, the treated noise intermediate-freuqncy signal of Jiang Silu phase adduction road forms one tunnel intermediate-freuqncy signal.Simultaneously, it is carried out pulse with the original intermediate-freuqncy signal of handling through certain time-delay offset processing, reach the purpose of subduing peak-to-average force ratio with this.Compare with existing intermediate-frequency section, the signal through the intermediate frequency peak-clipping module not only satisfies spectrum requirement here, can also significantly improve the peak-to-average force ratio of output signal.Obviously, because noise signal generates and Filtering Processing needs a fixed response time, the retardation of the intermediate-freuqncy signal of original input can be by repeatedly emulation is definite.
The intermediate frequency peak-clipping module of the embodiment of the invention compared with prior art more is applicable to the multicarrier system that carrier wave is adjustable, reduces the peak-to-average power ratio of signal effectively at intermediate frequency.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (5)
1. the method for restraining peak average power ratio based on pulse regneration is characterized in that, may further comprise the steps:
Calculate the phase place and the amplitude mould value of the intermediate-freuqncy signal of current input,, then utilize the amplitude and the corresponding phase place generted noise signal that exceed the threshold value part when amplitude mould value surpasses threshold value;
The noise signal that generates is demodulated to base band falls sampling filter and handle, more filtered noise signal is carried out rising and be modulated to intermediate frequency after sampling filter is handled;
Original intermediate-freuqncy signal after the time-delay is deducted noise signal, obtain the intermediate-freuqncy signal after peak clipping is handled.
2. a kind of according to claim 1 method for restraining peak average power ratio based on pulse regneration; It is characterized in that, if intermediate-freuqncy signal is that the addition of multichannel baseband signal forms, when carrying out Filtering Processing; Earlier noise signal is divided into and the identical multichannel of baseband signal quantity that forms original intermediate-freuqncy signal; Be demodulated to base band by different local oscillation signals respectively, fall sampling filter and handle, will fall noise signal behind the sampling filter again and carry out rising and be modulated to intermediate frequency after sampling filter is handled; To be modulated to the noise signal phase adduction road of intermediate frequency at last through different local oscillation signals, form the output of one road mid-frequency noise signal.
3. the intermediate frequency peak-clipping module is characterized in that, comprises that noise signal generation unit, filter unit, delay unit and pulse offset the unit; The input of intermediate frequency input signal input noise signal generation unit and the input of delay unit; The output of noise signal generation unit links to each other with the input of filter unit; The output of filter unit links to each other with the input that pulse offsets the unit; The output of delay unit links to each other with another input that pulse offsets the unit, and pulse offsets the output of unit and exports the intermediate-freuqncy signal after peak clipping is handled;
Said noise signal generation unit is used for, and calculates the phase place and the amplitude mould value of the intermediate-freuqncy signal of current input, when amplitude mould value surpasses threshold value, then utilizes the amplitude and the corresponding phase place generted noise signal that exceed the threshold value part;
Said filter unit is used for, and the noise signal that generates is demodulated to base band falls sampling filter and handle, and will fall noise signal behind the sampling filter again and carry out rising and be modulated to intermediate frequency after sampling filter is handled;
Said delay unit is used for, and input signal is carried out delay process, and the noise signal of the original input signal of feasible output and filter unit output is synchronous;
Said pulse offsets the unit and is used for, and the original intermediate-freuqncy signal after the time-delay is deducted noise signal, obtains the intermediate-freuqncy signal after peak clipping is handled.
4. like the said intermediate frequency peak-clipping module of claim 3; It is characterized in that; When the intermediate frequency peak-clipping module was applied to the adjustable multicarrier system of carrier wave, said filter unit comprised that some filtering subelements form, and filter unit is with each the filtering subelement of noise signal input that generates; Said filtering subelement is demodulated to base band with the noise signal that generates and falls the sampling filter processing; To fall filtered noise signal and carry out rising and be modulated to intermediate frequency after sampling filter is handled, filter unit closes the road with the mid-frequency noise signal plus after each filtering subelement output again, forms the output of one tunnel intermediate-freuqncy signal; The frequency that realizes demodulation, the employed local oscillation signal of modulation between each filtering subelement is different, and the number of filtering subelement is identical with the baseband signal quantity that forms original intermediate-freuqncy signal in the filter unit.
5. like the said intermediate frequency peak-clipping module of claim 3, it is characterized in that the local oscillation signal that the local oscillation signal that demodulation in said some filtering subelements, modulation are used uses for the base band demodulating after delaying time, modulation.
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| CN111147418A (en) * | 2019-12-27 | 2020-05-12 | 京信通信系统（中国）有限公司 | Signal peak-to-average ratio reduction method, device, equipment and storage medium |
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| CN1702964A (en) * | 2005-07-07 | 2005-11-30 | 中兴通讯股份有限公司 | Preprocessing technology employed multi-carrier signal peak clipping device and method |
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Cited By (2)
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Application publication date: 20120718 |