CN101741792A - Signal processing method, device and system - Google Patents
Signal processing method, device and system Download PDFInfo
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- CN101741792A CN101741792A CN200810172113A CN200810172113A CN101741792A CN 101741792 A CN101741792 A CN 101741792A CN 200810172113 A CN200810172113 A CN 200810172113A CN 200810172113 A CN200810172113 A CN 200810172113A CN 101741792 A CN101741792 A CN 101741792A
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- orthogonal frequency
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- multiplex singal
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Abstract
The embodiment of the invention discloses a signal processing method, a device and a system; the method comprises that: a data signal is received and is modulated to an orthogonal frequency division multiplexing signal; an anti-tangent function of which a function curve passes through a coordinate origin is generated, and the gradient value of the function curve of the anti-tangent function, which passes through the coordinate origin is more than 1; the orthogonal frequency division multiplexing signal is compressed according to the anti-tangent function; by adopting the method provided by the embodiment of the invention, the signal amplitude of the signal does not exceed the linear range of the devices, and the peak mean value power ratio of the orthogonal frequency division multiplexing signal is reduced.
Description
Technical field
The present invention relates to communication field, relate in particular to a kind of method for processing signals, device and system.
Background technology
In optical communication field, adopt orthogonal frequency division multiplexi can improve signal the availability of frequency spectrum, exempt dispersion compensation, put forward Anti-PMD (Polarization Mode Dispersion, polarization mode dispersion) effect better.Owing to adopt IFFT (Inverse Fast Fourier Transform, quick inversefouriertransform) conversion produces orthogonal frequency-division multiplex singal, orthogonal frequency-division multiplex singal be distributed with very big uncertainty, caused the very big PAPR of signal (Peak To Average Power Ratio, peak to average power ratio).When PAPR is excessive, can produce nonlinear distortion, cause significantly spread spectrum and inband signaling distortion, cause systematic function to descend.Therefore prior art adopts μ rule compression method technology to suppress PAPR.
The inventor finds that there is following problem at least in prior art in realizing process of the present invention:
When adopting μ rule compression method, small-signal is amplified, large-signal is not handled, so the signal after the compression can not reduce PAPR effectively because compression is only handled.
Summary of the invention
The embodiment of the invention provides a kind of method for processing signals, device and system, can guarantee that signal amplitude is no more than the device range of linearity.
On the one hand, the embodiment of the invention provides a kind of method for processing signals, comprising:
Receiving data-signal, is orthogonal frequency-division multiplex singal with described data signal modulation;
Produce the zeroaxial arctan function of function curve, the function curve of described arctan function passes through the slope value of the origin of coordinates greater than 1;
Described orthogonal frequency-division multiplex singal is compressed according to described arctan function.
On the other hand, the embodiment of the invention provides a kind of device of signal processing, comprising:
Modulation module receives data-signal, is orthogonal frequency-division multiplex singal with described data signal modulation;
The function generation module is used to produce the zeroaxial arctan function of function curve, and the function curve of described arctan function passes through the slope value of the origin of coordinates greater than 1;
Compression module is used for described orthogonal frequency-division multiplex singal is compressed according to described arctan function.
The embodiment of the invention provides a kind of system of signal processing, comprising: signal sending end and signal receiving end;
Described signal sending end is used to receive data-signal, is orthogonal frequency-division multiplex singal with described data signal modulation; Produce the zeroaxial arctan function of function curve, the function curve of described arctan function passes through the slope value of the origin of coordinates greater than 1; Described orthogonal frequency-division multiplex singal is compressed according to described arctan function; Orthogonal frequency-division multiplex singal after the compression is sent;
Described signal receiving end is used to receive the orthogonal frequency-division multiplex singal after the compression that described signal sending end sends; Orthogonal frequency-division multiplex singal after utilizing the tan corresponding with described arctan function to described compression decompresses; Demodulate data-signal the orthogonal frequency-division multiplex singal after decompressing.
Compared with prior art, the embodiment of the invention has the following advantages:
The technical scheme that the embodiment of the invention provides after signal sending end is the digital quadrature frequency-division multiplex singal with data signal modulation, is compressed this digital quadrature frequency-division multiplex singal according to the zeroaxial arctan function of function curve; Because arctan function can limit in the orthogonal frequency-division multiplex singal big amplitude signal, thus the maximum output amplitude of signal after can limit compression, thus the maximum power value of signal after the limit compression; Simultaneously because arctan function passes through the slope value of the origin of coordinates greater than 1, when former data-signal increases 1 times, the multiple that data-signal after the compression increases is greater than 1, and the effect that small-signal is amplified is more remarkable, thereby increases the performance number and the average power content of the overall signal after the compression.The maximum power value of signal after the average power content of signal and the limit compression after the technical scheme that the embodiment of the invention provides is compressed by increase, and PAPR is the ratio of maximum power value and average power content, so reached the purpose that reduces PAPR.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a method for processing signals flow chart in the embodiment of the invention;
Fig. 2 is a method for processing signals flow chart in another embodiment of the present invention;
Fig. 3 is the device schematic diagram of signal processing in the embodiment of the invention;
Fig. 4 is the system schematic of signal processing in the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The embodiment of the invention provides a kind of method for processing signals, device and system, can guarantee that signal amplitude is no more than the device range of linearity, and reduces the PAPR of signal.
The method for processing signals, device and the system that the embodiment of the invention are provided below in conjunction with the drawings and specific embodiments are elaborated.
The embodiment of the invention has proposed a kind of method for processing signals, as shown in Figure 1, comprising:
Transmitting terminal receives the data-signal of serial input, and the data-signal that serial is imported is divided into parallel data-signal; By the inverse discrete Fourier transform process this data-signal is converted into orthogonal frequency-division multiplex singal.Because this modulated process can adopt conventional modulator approach, so just simple here the description.
After the end to be compressed, the orthogonal frequency-division multiplex singal after the compression can be amplified and output through amplifier.When using amplifier to carry out the signal amplification, require the amplitude maximum of this orthogonal frequency-division multiplex singal to be no more than the input signal maximum that is allowed when linearity of amplifier is worked, need adjust the coefficient of this arctan function when therefore producing arctan function, make the amplitude maximum of the orthogonal frequency-division multiplex singal after compressing be not more than the input signal maximum that is allowed when linearity of amplifier is worked.This coefficient is used to control the amplitude of the orthogonal frequency-division multiplex singal after the compression.
Owing to adopted arctan function that orthogonal frequency-division multiplex singal is compressed at signal sending end, so signal receiving end, after receiving orthogonal frequency-division multiplex singal, utilize the tan corresponding that orthogonal frequency-division multiplex singal after compressing is decompressed with arctan function; Demodulate data-signal the orthogonal frequency-division multiplex singal after decompressing then, wherein demodulate data-signal the orthogonal frequency-division multiplex singal after decompressing and to adopt conventional demodulation method.
The method that the embodiment of the invention provides, adopt arctan function that orthogonal frequency-division multiplex singal is compressed, and the amplitude of orthogonal frequency-division multiplex singal adjusted dynamically the input signal maximum that the amplitude maximum that can guarantee orthogonal frequency-division multiplex singal is like this allowed when being no more than linearity of amplifier work.
The scheme that the embodiment of the invention provides after signal sending end is orthogonal frequency-division multiplex singal with data signal modulation, is compressed this orthogonal frequency-division multiplex singal according to the zeroaxial arctan function of function curve; Because arctan function can limit in the orthogonal frequency-division multiplex singal big amplitude signal, thus the maximum output amplitude of orthogonal frequency-division multiplex singal after can limit compression, thus the maximum power value of orthogonal frequency-division multiplex singal after the limit compression; Simultaneously because arctan function passes through the slope value of the origin of coordinates greater than 1, so when former orthogonal frequency-division multiplex singal increases 1 times, the multiple that orthogonal frequency-division multiplex singal after the compression increases is greater than 1, the effect that small-signal is amplified is more remarkable, thereby increases the performance number and the average power content of the overall signal after the compression.The method that the embodiment of the invention provides, can increase the average power content of compression back orthogonal frequency-division multiplex singal, and the maximum power value of orthogonal frequency-division multiplex singal after the limit compression, because PAPR is the ratio of maximum power value and average power content, so can also reach the purpose that reduces PAPR.
When producing orthogonal frequency-division multiplex singal in the prior art, the data-signal that receives is modulated the generation orthogonal frequency-division multiplex singal, after processes such as overcompression, amplification, export then.The method that the embodiment of the invention provides adopts arctan function that orthogonal frequency-division multiplex singal is compressed processing, and as shown in Figure 2, detailed process comprises:
Because arctan function passes through the slope value of the origin of coordinates greater than 1, when former orthogonal frequency-division multiplex singal x increased 1 times, the multiple that the orthogonal frequency-division multiplex singal y after the compression increases was greater than 1, and the effect that small-signal is amplified is more remarkable.Simultaneously, because the A value is definite, the maximum power value of this orthogonal frequency-division multiplex singal is just definite so, and this moment, the B value was big more, when former orthogonal frequency-division multiplex singal x increases, the multiple that orthogonal frequency-division multiplex singal y after the compression increases is just big more, therefore the performance number of overall data signal increases, and average power content also increases, thus A value when definite the B value big more, arctan function is big more by the slope of initial point, and is big more for the amplitude lifting of small-signal.And owing to the A value is determined, the maximum output amplitude of compression back orthogonal frequency-division multiplex singal determines that the small signal amplitudes lifting is big more so, and the average power of overall signal is big more.Simultaneously PAPR is the ratio of maximum power value and average power content, so can draw the A value when definite, the B value is big more, and the ratio of maximum power value and average power content is more little, and promptly the PAPR value is more little.The method that the embodiment of the invention provides makes arctan function to carry out amplitude limit to large-signal by adjusting the value of A, B, promotes for the small-signal amplitude, has reached the purpose that reduces PAPR.
Orthogonal frequency-division multiplex singal after step 203, signal sending end utilize amplifier to compression amplifies and exports;
Above-mentioned steps is utilized the inherent characteristic of above-mentioned arctan function, the limit that is arctan (B*x) is a pi/2, control the amplitude of orthogonal frequency-division multiplex singal by adjusting the A value, the input signal maximum that is allowed when making the amplitude maximum of the orthogonal frequency-division multiplex singal after the compression be no more than linearity of amplifier work, process by above-mentioned processing simultaneously, the small magnitude signal there is certain amplification, big amplitude signal is compressed again, and reduced PAPR; Alternatively, the method for the embodiment of the invention can also comprise: behind the orthogonal frequency-division multiplex singal of signal receiving end received signal transmitting terminal output, this orthogonal frequency-division multiplex singal is handled accordingly, it is reverted to data-signal, detailed process is as follows:
Orthogonal frequency-division multiplex singal after the compression that step 204, signal receiving end receiving end/sending end send; Orthogonal frequency-division multiplex singal after utilizing the tan corresponding with arctan function to compression decompresses; Described decompress(ion) is condensed to the conversion that decompresses according to y=tan (x/A)/B, and wherein y=tan (x/A)/B is corresponding with above-mentioned y=A*arctan (B*x).
Demodulate data-signal step 205, the orthogonal frequency-division multiplex singal of signal receiving end after decompressing; This rectification process can comprise to the orthogonal frequency-division multiplex singal after this decompression carry out and go here and there conversion, use discrete Fourier transform that signal is carried out demodulation, obtain data-signal at last.Because this demodulating process can adopt conventional demodulation method, so just simple here the description.
The method that the embodiment of the invention provides adopts arctan function and tan to carry out the compression and decompression of signal, and algorithm is simple, is easy to realize, and is relatively good to the inhibition effect of PAPR.
The method that the embodiment of the invention provides after signal sending end is orthogonal frequency-division multiplex singal with data signal modulation, is compressed this orthogonal frequency-division multiplex singal according to the zeroaxial arctan function of function curve; Because arctan function can limit in the orthogonal frequency-division multiplex singal big amplitude signal, thus the maximum output amplitude of signal after can limit compression, thus the maximum power value of signal after the limit compression; Simultaneously, because arctan function passes through the slope value of the origin of coordinates greater than 1, when former data-signal increased 1 times, the multiple that the data-signal after the compression increases was greater than 1, the effect that small-signal is amplified is more remarkable, thereby increases the performance number and the average power content of the overall signal after the compression.The method that the embodiment of the invention provides, the maximum power value of signal after average power content by increasing compression back signal and the limit compression, and PAPR is the ratio of maximum power value and average power content, so reached the purpose that reduces PAPR.
Be the method that realizes that the embodiment of the invention provides, the embodiment of the invention also provides a kind of device of signal processing, as shown in Figure 3, comprising:
This device can also comprise: amplification module 340 is used for the orthogonal frequency-division multiplex singal output after amplifier amplifies after compression module 330 compressions; The amplitude maximum of the orthogonal frequency-division multiplex singal after the wherein said compression is not more than the input signal maximum that is allowed when described linearity of amplifier is worked.
Above-mentioned function generation module 320 can comprise:
Generate submodule 3201, be used to generate arctan function y=A*arctan (B*x);
Above-mentioned coefficient adjustment submodule 3202 can also be used for: after the adjustment of described A value is finished, adjust described B value and make arctan function y=A*arctan (B*x) pass through the slope value of the origin of coordinates greater than 1.
The device that the embodiment of the invention provides, utilize compression module that orthogonal frequency-division multiplex singal is compressed according to arctan function at signal sending end, make the signal amplitude maximum of the orthogonal frequency-division multiplex singal after the compression be no more than the device range of linearity, and reduced the PAPR of signal.
The embodiment of the invention also provides a kind of signal processing system, as shown in Figure 4, comprising: signal sending end 410 and signal receiving end 420;
The signal processing system that the embodiment of the invention provides after signal sending end is orthogonal frequency-division multiplex singal with data signal modulation, is compressed this orthogonal frequency-division multiplex singal according to the zeroaxial arctan function of function curve; Because arctan function can limit in the orthogonal frequency-division multiplex singal big amplitude signal, thus the maximum output amplitude of signal after can limit compression, thus the maximum power value of signal after the limit compression; Simultaneously because arctan function passes through the slope value of the origin of coordinates greater than 1, when former data-signal increases 1 times, the multiple that data-signal after the compression increases is greater than 1, and the effect that small-signal is amplified is more remarkable, thereby increases the performance number and the average power content of the overall signal after the compression.The maximum power value of signal after the average power content of signal and the limit compression after the signal processing system that the embodiment of the invention provides is compressed by increase, and PAPR is the ratio of maximum power value and average power content, so reached the purpose that reduces PAPR.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (10)
1. a signal processing method is characterized in that, comprising:
Receiving data-signal, is orthogonal frequency-division multiplex singal with described data signal modulation;
Produce the zeroaxial arctan function of function curve, the function curve of described arctan function passes through the slope value of the origin of coordinates greater than 1;
Described orthogonal frequency-division multiplex singal is compressed according to described arctan function.
2. the method for claim 1 is characterized in that, also comprises after described orthogonal frequency-division multiplex singal is compressed according to described arctan function:
With the output after amplifier amplifies of the orthogonal frequency-division multiplex singal after the compression;
The zeroaxial arctan function of described generation function curve comprises:
Generate arctan function, the coefficient of adjusting described arctan function makes the input signal maximum that the amplitude maximum of the orthogonal frequency-division multiplex singal after the described compression is allowed when being not more than described linearity of amplifier work.
3. the method for claim 1, it is characterized in that, described arctan function is y=A*arctan (B*x), wherein A is used to control the amplitude of the orthogonal frequency-division multiplex singal after the compression, B is used for when the A value is determined, the peak to average power ratio of the orthogonal frequency-division multiplex singal after the control compression, the orthogonal frequency-division multiplex singal before x represents to compress, the orthogonal frequency-division multiplex singal after y represents to compress.
4. method as claimed in claim 3 is characterized in that, the zeroaxial arctan function of described generation function curve comprises:
Generate arctan function y=A*arctan (B*x), adjust described A value and make the orthogonal frequency-division multiplex singal amplitude maximum after the described compression be not more than the input signal maximum that is allowed when linearity of amplifier is worked.
5. method as claimed in claim 4 is characterized in that, after the adjustment of described A value is finished, adjusts described B value and makes arctan function y=A*arctan (B*x) pass through the slope value of the origin of coordinates greater than 1.
6. a signal processing apparatus is characterized in that, comprising:
Modulation module receives data-signal, is orthogonal frequency-division multiplex singal with described data signal modulation;
The function generation module is used to produce the zeroaxial arctan function of function curve, and the function curve of described arctan function passes through the slope value of the origin of coordinates greater than 1;
Compression module is used for described orthogonal frequency-division multiplex singal is compressed according to described arctan function.
7. device as claimed in claim 6 is characterized in that, also comprises:
Amplification module is used for the output after amplifier amplifies of the orthogonal frequency-division multiplex singal after the compression module compression; The amplitude maximum of the orthogonal frequency-division multiplex singal after the wherein said compression is not more than the input signal maximum that is allowed when described linearity of amplifier is worked.
8. device as claimed in claim 7 is characterized in that, described function generation module comprises:
Generate submodule, be used to generate arctan function y=A*arctan (B*x);
The coefficient adjustment submodule is used to adjust described A value and makes the orthogonal frequency-division multiplex singal amplitude maximum after the described compression be not more than the input signal maximum that is allowed when linearity of amplifier is worked.
9. device as claimed in claim 8 is characterized in that, described coefficient adjustment submodule also is used for:
After the adjustment of described A value is finished, adjust described B value and make arctan function y=A*arctan (B*x) pass through the slope value of the origin of coordinates greater than 1.
10. a signal processing system is characterized in that, comprising: signal sending end and signal receiving end;
Described signal sending end is used to receive data-signal, is orthogonal frequency-division multiplex singal with described data signal modulation; Produce the zeroaxial arctan function of function curve, the function curve of described arctan function passes through the slope value of the origin of coordinates greater than 1; Described orthogonal frequency-division multiplex singal is compressed according to described arctan function; Orthogonal frequency-division multiplex singal after the compression is sent;
Described signal receiving end is used to receive the orthogonal frequency-division multiplex singal after the compression that described signal sending end sends; Orthogonal frequency-division multiplex singal after utilizing the tan corresponding with described arctan function to described compression decompresses; Demodulate data-signal the orthogonal frequency-division multiplex singal after decompressing.
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| CN200810172113A CN101741792A (en) | 2008-11-10 | 2008-11-10 | Signal processing method, device and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110798865A (en) * | 2019-10-14 | 2020-02-14 | 京信通信系统（中国）有限公司 | Data compression method, data compression device, computer equipment and computer-readable storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110798865A (en) * | 2019-10-14 | 2020-02-14 | 京信通信系统（中国）有限公司 | Data compression method, data compression device, computer equipment and computer-readable storage medium |
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Application publication date: 20100616 |