CN101662447B - Process method of despiking and device thereof - Google Patents
Process method of despiking and device thereof Download PDFInfo
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- CN101662447B CN101662447B CN 200910178828 CN200910178828A CN101662447B CN 101662447 B CN101662447 B CN 101662447B CN 200910178828 CN200910178828 CN 200910178828 CN 200910178828 A CN200910178828 A CN 200910178828A CN 101662447 B CN101662447 B CN 101662447B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- H04L27/2623—Reduction thereof by clipping
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Abstract
The invention discloses a process method of despiking and a device thereof. The method comprises the steps: obtaining a process sequence for despiking by over sampling an initial frequency domain signal of an orthogonal frequency division multiplexing (OFDMA) system; and despiking the process sequence for despiking. The technical scheme of the invention replaces interpolation filter process which causes the peak-to-average ratio of the signal to be re-degenerated, thereby reducing the peak-to-average ratio of the OFDMA system and improving the performance of the OFDMA system.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to a kind of peak clipping processing method and device.
Background technology
Peak-to-average power ratio (Peak-to-Average Power Ratio, PAPR), referred to as peak-to-average force ratio, it is defined as the peak power of signal in the certain hour and the ratio of average power, generally is used for describing the amplitude of signal fluctuation and with the quality of this gauge signal.
In recent years, broadband wireless technology take IEEE 802.16e standard as the basis has become mainstream technology, 802.16e the OFDM that uses in the agreement (OrthogonalFrequency Division Multiplexing, OFDMA) although obtained using more and more widely, the PAPR value is too high but to be Main Bottleneck on this application all the time.
The PAPR value of OFDMA system is too high, i.e. relative single-carrier system, and the instantaneous value of the output signal of OFDMA transmitter has larger fluctuation.This just requires more intrasystem parts, and such as power amplifier, A/D, D/A converter etc. need to have the very large range of linearity.But the non-linear of these parts also can produce nonlinear distortion to the larger signal of dynamic range, and the harmonic wave that produces can cause the phase mutual interference between the subchannel, thereby affects the performance of OFDMA system.In addition, requiring that the power amplifier of the very big range of linearity is arranged is to be difficult to realize at hardware, therefore, how PAPR is reduced to optimum efficiency and just seems and be even more important.
For the problems referred to above, amplitude limit, limit filtration, coding, part transfer sequence (Partial Transmit Sequence have also been proposed in the prior art, PTS), selectivity mapping (Selected Mapping, SLM) and tone keep multiple solutions such as (Tone Reservation, TR).
The advantage of TR solution is to cause the distortion of OFDMA signal, and the too high signal of peak-to-average force ratio is had good improvement effect.But process through peak clipping, peak-to-average force ratio obtains the signal after the fine improvement, after transmission in need through the intermediate frequency filtering interpolation, and filtering interpolation will cause peak-to-average force ratio again to be worsened.
Summary of the invention
In view of this, the invention provides a kind of peak clipping processing scheme, the problem that is again worsened in order to the peak-to-average force ratio that solves in the prior art because of the signal of filtering interpolation after causing improving.
According to an aspect of the present invention, provide a kind of peak clipping processing method.
According to peak clipping processing method of the present invention, comprising: carry out over-sampling by the initial frequency-region signal to orthogonal frequency division multiplex OFDM A system, obtain treating peak clipping processing sequence; This is treated that peak clipping processes sequence and carry out peak clipping and process.
Preferably, above-mentionedly carry out over-sampling by the initial frequency-region signal to the OFDMA system, obtain treating that peak clipping processes sequence, comprise: according to the N of the sampling rate of OFDMA system doubly, initial frequency-region signal is carried out the interpolation zero filling process, generate the over-sampling sequence, wherein, N is the integer more than or equal to 2; The over-sampling sequence is carried out inverse Fourier transform, obtain treating peak clipping processing sequence.
Preferably, above-mentioned N value equals 2.
Further, the above-mentioned peak clipping processing sequence for the treatment of is carried out peak clipping and processed, comprising: determine peak clipping kernel sequence according to the carrier information of preserved sub-carrier, and will treat that peak clipping processing sequence is as the current peak clipping processing sequence for the treatment of; And following steps (step 1-step 3):
Step 1 is determined the current maximum power value for the treatment of peak clipping processing sequence, determines test value according to maximum power value;
Step 2 is carried out cyclic shift to peak clipping kernel sequence and is processed, and generates iteration peak clipping kernel sequence;
Step 3 is according to above-mentioned peak clipping processing sequence, test value and the iteration peak clipping kernel sequence column-generation peak clipping result sequence treated.
Further, set counter, and described counter carried out initialization, after above-mentioned steps 3, the method also comprises: utilizes counter that the peak clipping iterations is counted, and whether judges number of times that counter calculates less than default peak clipping iterative target number of times, if, then treat that as current peak clipping processes sequence, execution in step 1 with peak clipping result sequence; Otherwise, finish peak clipping and process operation.
According to another aspect of the present invention, provide a kind of peak clipping processing unit.
According to peak clipping processing unit of the present invention, comprise: treat peak clipping processing sequence generation module, peak clipping processing module, wherein, treat peak clipping processing sequence generation module, be used for carrying out over-sampling by the initial frequency-region signal to the OFDMA system, obtain treating peak clipping processing sequence; The peak clipping processing module is used for the described peak clipping processing sequence for the treatment of is carried out peak clipping and processed.
Further, the above-mentioned peak clipping processing sequence generation module for the treatment of comprises: over-sampling submodule, inverse Fourier transform submodule, wherein, the over-sampling submodule, be used for according to the N of the sampling rate of OFDMA system doubly initial frequency-region signal being carried out the interpolation zero filling processing, generate the over-sampling sequence, wherein, N is the integer more than or equal to 2; The inverse Fourier transform submodule is used for the over-sampling sequence is carried out inverse Fourier transform, generates to treat peak clipping processing sequence, and will treat that peak clipping processing sequence outputs to the peak clipping processing module as the current peak clipping processing sequence for the treatment of.
Further, peak clipping processing unit according to the present invention also comprises: peak clipping kernel sequence column-generation module is used for generating peak clipping kernel sequence according to the carrier information of preserved sub-carrier.
Further, above-mentioned peak clipping processing module comprises: sub module stored, maximum power value determine that submodule, test value generate submodule, iteration peak clipping kernel sequence column-generation submodule and peak clipping and process submodule, wherein, sub module stored is used for storing the current peak clipping processing sequence for the treatment of; Maximum power value is determined submodule, is used for determining the current maximum power value of peak clipping processing sequence and the phase angle of maximum power value for the treatment of; Test value generates submodule, is used for determining maximum power value that submodule is determined and the phase angle of maximum power value according to maximum power value, generates test value; Iteration peak clipping kernel sequence column-generation submodule is used for that the peak clipping kernel sequence that peak clipping kernel sequence column-generation module generates is carried out cyclic shift and processes, and generates iteration peak clipping kernel sequence; Submodule is processed in peak clipping, is used for generating peak clipping result sequence according to above-mentioned treating in peak clipping processing sequence, test value and the iteration peak clipping.
Further, peak clipping processing unit according to the present invention also comprises: counter, iteration control unit, and wherein, counter is used for the peak clipping iterations is counted, and when peak clipping result sequence generated, the increase of control peak clipping iterations was once; Whether iteration control unit, the number of times that is used for judging counter calculating if so, then with peak clipping result sequence as current treat peak clipping processing sequence are input to sub module stored less than default peak clipping iterative target number of times, trigger the peak clipping processing module; Otherwise, peak clipping result sequence is exported as the peak clipping result.
Compared with prior art, by above-mentioned at least one scheme of the present invention, adopting the inventive method and install can be on the basis of original reduction OFDMA system peak-to-average ratio, by the initial frequency-region signal of OFDMA system being carried out the processing of over-sampling, replacing the filtering interpolation that the peak-to-average force ratio that can cause signal worsens again processes, thereby both reduced the peak-to-average force ratio of OFDMA system, improved again the performance of OFDMA system.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of writing, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide a further understanding of the present invention, and consists of the part of specification, is used for together with embodiments of the present invention explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the peak clipping processing method of the embodiment of the invention;
Fig. 2 processes the flow chart of retrieval method according to the peak clipping for the treatment of of the embodiment of the invention;
Fig. 3 processes the flow chart that sequence is carried out the peak clipping processing according to the peak clipping for the treatment of of the embodiment of the invention;
Fig. 4 is the detail flowchart of according to the preferred embodiment of the invention peak clipping processing method;
Fig. 5 is the structural representation according to the peak clipping processing unit of the embodiment of the invention.
Embodiment
Functional overview
The technical scheme that the embodiment of the invention provides, carry out over-sampling by the initial frequency-region signal to orthogonal frequency division multiplex OFDM A system, generate sample sequence, this sample sequence is carried out inverse Fourier transform obtain treating peak clipping processing sequence, and treat peak clipping processing sequence and carry out the peak clipping processing, generate peak clipping result sequence.
In the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, is not intended to limit the present invention.
According to the embodiment of the invention, at first provide a kind of peak clipping processing method.
Fig. 1 is the flow chart according to the peak clipping processing method of the embodiment of the invention, and as shown in Figure 1, the method comprises (step 102-step 104):
Step 102, carry out over-sampling by the initial frequency-region signal to orthogonal frequency division multiplex OFDM A system, obtain treating that peak clipping processes sequence;
Step 104, treat that to above-mentioned peak clipping processes sequence and carry out peak clipping and process.
As shown in Figure 2, in concrete implementation process, above-mentioned steps 102 can realize by following steps (step 202-step 204):
Step 202, according to the N of the sampling rate of OFDMA system is doubly carried out the interpolation zero filling to initial frequency-region signal and is processed, and generates the over-sampling sequence, and wherein, N is the integer more than or equal to 2;
Step 204, above-mentioned over-sampling sequence is carried out inverse Fourier transform, obtain treating that peak clipping processes sequence.
As shown in Figure 3, in concrete implementation process, above-mentioned steps 104 can realize (step 302-step 310) by following flow process:
Step 302, determine peak clipping kernel sequence according to the carrier information of preserved sub-carrier, and treat that with above-mentioned peak clipping processes sequence and treat that as current peak clipping processes sequence;
Preferably, the position of preserved sub-carrier is to determine according to the definition to subchannel among the IEEE 802.1, and the position of preserved sub-carrier is lower than the subchannel of set point for idle subchannel or transmission signal to noise ratio.
Step 304, determine currently to treat that peak clipping processes the maximum power value of sequence, determine test value according to maximum power value;
Preferably, determine the current maximum power value of processing sequence until peak clipping after, also need to determine the phase angle of this maximum power value, and determine test value according to above-mentioned maximum power value and phase angle.
Step 306, the peak clipping kernel sequence of determining in the step 302 is carried out cyclic shift process, generate iteration peak clipping kernel sequence;
Preferably, according to the above-mentioned position of maximum power value in treating peak clipping processing sequence for the treatment of peak clipping processing sequence, the peak clipping kernel sequence of determining in the step 302 is carried out cyclic shift process, generate iteration peak clipping kernel sequence.
Step 308, treat that according to above-mentioned peak clipping processes sequence, above-mentioned test value and above-mentioned iteration peak clipping kernel sequence column-generation peak clipping result sequence.
Preferably, in the peak clipping processing method that the embodiment of the invention provides, also need to arrange counter, utilize this counter that the peak clipping iterations is counted.
The initial value of above-mentioned counter can be set to 0, and after each peak clipping was processed, the value of current counter added 1, until the value of counter equals predefined peak clipping target iteration number of times, finishes whole peak clipping handling process.
The initial value of above-mentioned counter also can be set to predefined peak clipping target iteration number of times, and after each peak clipping was processed, the value of current counter subtracted 1, until the value 0 of counter finishes whole peak clipping handling process.
Step 310, when generating peak clipping result sequence, whether judge number of times that above-mentioned counter calculates less than default peak clipping iterative target number of times, if so, then treat that as current peak clipping processes sequence, execution in step 304 with described peak clipping result sequence; Otherwise, finish the peak clipping handling process.
In above-mentioned flow process (step 302-step 310), treat that current peak clipping processes after sequence determines, step 304 and step 306 without strict sequencing, can first execution in step 304, also can first execution in step 306, can also executed in parallel.
Below by specific embodiment above-mentioned peak clipping processing method is described in detail.
Fig. 4 is the detail flowchart of according to the preferred embodiment of the invention peak clipping processing method.As shown in Figure 4, the detailed process of the preferred embodiment following (step 402-step 414):
Step 402, to the initial frequency-region signal dat (j) of OFDMA system, j[1, N] carry out over-sampling and process, generate over-sampling sequence samp (i), i[1,2N];
In this step, 2 times of the sampling rate that the use system is current carry out the processing of interpolation zero filling to initial frequency-region signal.Suppose initial frequency-region signal dat (j), j[1, N] comprise N subcarrier, be expressed as respectively dat (1), dat (2) ..., dat (N).At first get the 1st～N/2 subcarrier of this signal as the 1st～N/2 the subcarrier of over-sampling sequence samp, be expressed as samp (1), samp (2) ..., samp (N/2); Then fill out afterwards N zero the N/2+1 as over-sampling sequence samp～3N/2 subcarrier at N/2 the subcarrier samp (N/2) of over-sampling sequence, be expressed as samp (N/2+1), samp (N/2+2) ..., samp (3N/2); Get at last the N/2+1 of dat～N subcarrier as the 3N/2+1 of over-sampling sequence samp～2N subcarrier, be expressed as samp (3N/2+1), samp (3N/2+2) ..., samp (2N).Processing 2N the subcarrier that forms through over-sampling is exactly over-sampling sequence samp (i), i[1,2N], specifically be expressed as:
Step 404, to over-sampling sequence samp (i), i[1,2N] carry out inverse Fourier transform, produce and treat that peak clipping processes sequence data (i), i[1,2N];
Step 406, according to the carrier position information of preserved sub-carrier, utilize tone to keep algorithm and determine peak clipping kernel sequence kernel (i), i[1,2N], sequence data (i), i[1,2N are processed in above-mentioned peak clipping] treat that as current peak clipping processes sequence;
In concrete implementation process, obtain and the carrier position information a={a1 of temporary preserved sub-carrier, a2, a3....an}, (n＜N), and this positional information is carried out over-sampling process, obtain preserved sub-carrier sequence b (i);
To above-mentioned preserved sub-carrier sequence b (i), i[1,2N] carry out inverse Fourier transform (IFFT conversion), generate and temporary peak clipping kernel sequence kernel (i) i.e. kernel (i)=IFFT (b (i)), i[1,2N].
In this step, the position of preserved sub-carrier is to determine according to the definition of IEEE 802.16 sub-channels, and the position of preserved sub-carrier is lower than the subchannel of set point for idle subchannel or transmission signal to noise ratio.
Step 408, determine currently to treat that peak clipping processes the maximum power peak valmax among the sequence data (i), and determine test value beta according to beta=(valmax-target) * const*ej* θ (val);
Wherein, target is the peak clipping target power, and const is the peak clipping step-length, and θ (val) is the corresponding phase angle of maximum power peak valmax;
In this step, power peak valmax is according to valmax=max (| data (i) |) calculative determination, and peak clipping target power value target is 5.1dB; Peak clipping step-length const is 21.33325.
Step 410, peak clipping kernel sequence kernel (i) is carried out cyclic shift one time, obtain iteration peak clipping kernel sequence kernel ' (i);
In this step, iteration peak clipping kernel sequence kernel ' (i) obtains by following step:
A1) determine to treat that peak clipping processes the corresponding position pos of maximum power peak valmax among the sequence data (i);
A2) according to kernel ' (i)=kernel (mod (i+1-pos, 1024)) determines iteration peak clipping kernel sequence kernel ' (i).
Step 412, utilize data ' (i)=data (i)-beta*kernel ' (i) determines peak clipping result sequence data ' (i);
Step 414, judge that the value of counter is whether less than default peak clipping iterative target number of times, if, then (i) refresh and currently treat that peak clipping processes sequence data (i) with peak clipping result sequence data ', and execution in step 408, process operation otherwise finish peak clipping, the value of counter is made as initial value.
In above-mentioned flow process, (i) refresh and currently treat that peak clipping processes sequence data (i) afterwards with peak clipping result sequence data ', step 408 and step 410 without strict sequencing, can first execution in step 408, also can first execution in step 410, but also executed in parallel.
Although to use 2 times of the current sampling rate of system to describe as example, be not limited to this in the above-mentioned flow process, in concrete the application, also can carry out over-sampling to initial frequency-region signal with other multiple of the current sampling rate of system.
According to the embodiment of the invention, also provide a kind of peak clipping processing unit.
Fig. 5 is the structural representation according to the peak clipping processing unit of the embodiment of the invention, as shown in Figure 5, this device comprises: treat peak clipping processing sequence generation module 51 and peak clipping processing module 52, wherein, treat that peak clipping processing sequence generation module 51 is used for carrying out over-sampling by the initial frequency-region signal to the OFDMA system, obtains treating peak clipping processing sequence; Peak clipping processing module 52 is used for the above-mentioned peak clipping processing sequence for the treatment of is carried out peak clipping and processed.
As shown in Figure 5, the above-mentioned peak clipping processing sequence generation module 51 for the treatment of may further include: over-sampling submodule 511 and inverse Fourier transform submodule 512, wherein, over-sampling submodule 511, be used for according to the N of the sampling rate of OFDMA system doubly initial frequency-region signal being carried out the interpolation zero filling processing, generate the over-sampling sequence, wherein, N is the integer more than or equal to 2; Inverse Fourier transform submodule 512 is used for above-mentioned over-sampling sequence is carried out inverse Fourier transform, generates to treat peak clipping processing sequence, and this is treated that peak clipping processing sequence outputs to peak clipping processing module 52 as the current peak clipping processing sequence for the treatment of.
As shown in Figure 5, the peak clipping processing unit according to the embodiment of the invention also comprises: peak clipping kernel sequence column-generation module 53 is used for generating peak clipping kernel sequence according to the carrier information of preserved sub-carrier.
As shown in Figure 5, above-mentioned peak clipping kernel sequence column-generation module 53 further comprises: preserved sub-carrier obtains submodule 531, the preserved sub-carrier sequence generates submodule 532 and peak clipping kernel sequence column-generation submodule 533, wherein, preserved sub-carrier obtains submodule 531, be used for obtaining and the carrier position information of temporary preserved sub-carrier, wherein, the position of preserved sub-carrier can be to determine according to the definition of IEEE 802.16 sub-channels, can or transmit signal to noise ratio for some idle subchannel and be lower than set point, be i.e. the relatively poor subchannel of signal to noise ratio; The preserved sub-carrier sequence generates submodule 532, is used for obtaining according to preserved sub-carrier the carrier position Information generation preserved sub-carrier sequence of the preserved sub-carrier of submodule 531 storages; Peak clipping kernel sequence column-generation submodule 533 is used for reading the preserved sub-carrier sequence that the preserved sub-carrier sequence generates submodule 532 storages, and carries out inverse Fourier transform, generates and temporary peak clipping kernel sequence.
As shown in Figure 5, above-mentioned peak clipping processing module 52 further comprises: sub module stored 521, maximum power value determine that submodule 522, test value generate submodule 523, iteration peak clipping kernel sequence column-generation submodule 524 and peak clipping and process submodule 525, wherein, sub module stored 521 is used for storing the current peak clipping processing sequence for the treatment of; Maximum power value is determined submodule 522, is used for determining the current maximum power value of peak clipping processing sequence and the phase angle of this maximum power value for the treatment of; Test value generates submodule 523, is used for determining maximum power value that submodule is determined and the phase angle of maximum power value according to maximum power value, generates test value; Iteration peak clipping kernel sequence column-generation submodule 524 is used for that the peak clipping kernel sequence that peak clipping kernel sequence column-generation module generates is carried out cyclic shift and processes, and generates iteration peak clipping kernel sequence; Submodule 525 is processed in peak clipping, is used for generating peak clipping result sequence according to above-mentioned treating in peak clipping processing sequence, test value and the iteration peak clipping.
As shown in Figure 5, preferably, also comprise according to the peak clipping processing unit of the embodiment of the invention: counter 54 and iteration control unit 55, wherein, counter 54 is used for the peak clipping iterations is counted, when described peak clipping result sequence generated, the increase of control peak clipping iterations once; Iteration control unit 55, be used for judging that whether the number of times of counter calculating is less than default peak clipping iterative target number of times, if so, then be input to above-mentioned sub module stored 521 with peak clipping result sequence as the current peak clipping processing sequence for the treatment of, trigger peak clipping processing module 52; Otherwise, peak clipping result sequence is exported as the peak clipping result.
As mentioned above, the technical scheme that provides by the embodiment of the invention, by the initial frequency-region signal of OFDMA system being carried out the processing of over-sampling, replacing the filtering interpolation that the peak-to-average force ratio that can cause signal worsens again processes, thereby further reduced the peak-to-average force ratio of OFDMA system, and improved the performance of OFDMA system.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a peak clipping processing method is characterized in that, comprising:
Carry out over-sampling by the initial frequency-region signal to orthogonal frequency division multiplex OFDM system, obtain treating peak clipping processing sequence;
The described peak clipping processing sequence for the treatment of is carried out peak clipping and processed;
Wherein, carry out over-sampling by the initial frequency-region signal to ofdm system, obtain the described peak clipping processing sequence for the treatment of, comprising:
According to the M of the sampling rate of described ofdm system doubly, carry out the interpolation zero filling at N/2 subcarrier of the N/2+1 of described initial frequency-region signal～(2M-1) and process, generate the over-sampling sequence, wherein, M is the integer more than or equal to 2, and N is the subcarrier number of described initial frequency-region signal;
Described over-sampling sequence is carried out inverse Fourier transform, obtain the described peak clipping processing sequence for the treatment of.
2. method according to claim 1 is characterized in that, M equals 2.
3. method according to claim 1 is characterized in that, the described peak clipping processing sequence for the treatment of is carried out peak clipping and processed, and comprising:
Determine peak clipping kernel sequence according to the carrier information of preserved sub-carrier, and treat that with described peak clipping processes sequence and treat that as current peak clipping processes sequence;
Step 1 is determined the described current maximum power value for the treatment of peak clipping processing sequence, determines test value according to maximum power value;
Step 2 is carried out cyclic shift to described peak clipping kernel sequence and is processed, and generates iteration peak clipping kernel sequence;
Step 3 is according to described peak clipping processing sequence, described test value and the described iteration peak clipping kernel sequence column-generation peak clipping result sequence treated.
4. method according to claim 3 is characterized in that, sets counter, and described counter is carried out initialization, and after described step 3, described method also comprises:
Utilize described counter that the peak clipping iterations is counted, and whether judge number of times that described counter calculates less than default peak clipping iterative target number of times, if so, then treat that as current peak clipping processes sequence, execution in step 1 with described peak clipping result sequence; Otherwise, finish peak clipping and process operation.
5. a peak clipping processing unit is characterized in that, comprising:
Treat peak clipping processing sequence generation module, be used for carrying out over-sampling by the initial frequency-region signal to ofdm system, obtain treating peak clipping processing sequence;
The peak clipping processing module is used for the described peak clipping processing sequence for the treatment of is carried out peak clipping and processed;
Wherein, the described peak clipping processing sequence generation module for the treatment of comprises:
The over-sampling submodule, be used for according to the M of the sampling rate of described ofdm system doubly, carrying out the interpolation zero filling at N/2 subcarrier of the N/2+1 of described initial frequency-region signal～(2M-1) processes, generate the over-sampling sequence, wherein, M is the integer more than or equal to 2, and N is the subcarrier number of described initial frequency-region signal;
The inverse Fourier transform submodule is used for described over-sampling sequence is carried out inverse Fourier transform, generates to treat peak clipping processing sequence, and the described peak clipping processing sequence for the treatment of is outputed to described peak clipping processing module as the current peak clipping processing sequence for the treatment of.
6. device according to claim 5 is characterized in that, described device also comprises:
Peak clipping kernel sequence column-generation module is used for generating peak clipping kernel sequence according to the carrier information of preserved sub-carrier.
7. device according to claim 6 is characterized in that, described peak clipping processing module comprises:
Sub module stored is used for storing the described current peak clipping processing sequence for the treatment of;
Maximum power value is determined submodule, is used for determining the described current maximum power value of peak clipping processing sequence and the phase angle of described maximum power value for the treatment of;
Test value generates submodule, is used for determining described maximum power value that submodule is determined and the phase angle of described maximum power value according to described maximum power value, generates test value;
Iteration peak clipping kernel sequence column-generation submodule is used for that the described peak clipping kernel sequence that described peak clipping kernel sequence column-generation module generates is carried out cyclic shift and processes, and generates iteration peak clipping kernel sequence;
Submodule is processed in peak clipping, is used for generating peak clipping result sequence according to described treating in peak clipping processing sequence, described test value and the described iteration peak clipping.
8. device according to claim 7 is characterized in that, described device also comprises:
Counter is used for the peak clipping iterations is counted, and when described peak clipping result sequence generated, the increase of control peak clipping iterations once;
The iteration control unit, be used for judging that whether the number of times of described counter calculating is less than default peak clipping iterative target number of times, if so, then be input to described sub module stored with described peak clipping result sequence as the current peak clipping processing sequence for the treatment of, trigger described peak clipping processing module; Otherwise, described peak clipping result sequence is exported as the peak clipping result.
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| PCT/CN2010/072996 WO2010145397A1 (en) | 2009-09-28 | 2010-05-20 | Method and device for reducing peak-to-average power ratio of ofdma system |
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| JP6026006B2 (en) | 2013-10-30 | 2016-11-16 | 三菱電機株式会社 | Transmitting apparatus, receiving apparatus, and communication system |
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| CN1972265A (en) * | 2005-11-24 | 2007-05-30 | 中国科学院上海微***与信息技术研究所 | Method for suppressing peak to average ratio of multicarrier system for spectrum criterion in scope of four times bandwidth |
| CN101262460A (en) * | 2007-03-09 | 2008-09-10 | 中兴通讯股份有限公司 | A device and method for reducing peak mean ratio |
| CN101478521A (en) * | 2009-01-20 | 2009-07-08 | 华南理工大学 | Peak cutting method for adaptive in-band processing |
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| CN1972265A (en) * | 2005-11-24 | 2007-05-30 | 中国科学院上海微***与信息技术研究所 | Method for suppressing peak to average ratio of multicarrier system for spectrum criterion in scope of four times bandwidth |
| CN101262460A (en) * | 2007-03-09 | 2008-09-10 | 中兴通讯股份有限公司 | A device and method for reducing peak mean ratio |
| CN101478521A (en) * | 2009-01-20 | 2009-07-08 | 华南理工大学 | Peak cutting method for adaptive in-band processing |
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