CN103634247A - Method and device for realizing crest factor reduction - Google Patents
Method and device for realizing crest factor reduction Download PDFInfo
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Abstract
The invention discloses a method for realizing crest factor reduction (CFR) which is applied to a digital intermediate frequency system. The method comprises determining the number n of channels participating in multiplexing, CFR thresholds of each channel and interpolation multiple a, and allocating space for storing filter coefficients for each channel; outputting combined signals of each channel to a same CFR module and multiplexing data, which is subjected to interpolation filtering, of each channel into an original multiplex signal; processing the original multiplex signal by utilizing the CFR thresholds of each channel and the filter coefficients to obtain a multiplex signal after filtering; subtracting the multiplex signal after filtering from the original multiplex signal after delaying and thus a multiplex signal after CFR is obtained; and after demultiplexing, outputting the data of each channel to a DPD module of the channel. According to the method and device for realizing crest factor reduction, through multiple channels multiplexing the same CFR module, hardware resource overhead of a system is saved; and through the configuration of filter coefficients of each channel, the interchannel and inchannel CFR processing with multiple-pattern mixed mode is realized. The invention also discloses a device for realizing crest factor reduction.
Description
Technical field
The present invention relates to communication technical field, in particular a kind of peak clipping implementation method and device.
Background technology
As shown in Figure 1, in the down link of Digital IF Processing system, each carrier signal after Base-Band Processing is passed through respectively up-converter module DUC (Digital Up Converter) and is converted to digital medium-frequency signal, then You He road module is closed Lu Weiyi railway digital intermediate-freuqncy signal by multi-path digital intermediate-freuqncy signal, the digital medium-frequency signal closing behind road passes through peak-clipping module CFR (Crest Factor Reduction successively, crest factor is cut down), digital pre-distortion module DPD (Digital Pre-Distortion), D/A converter module DAC, RF processing unit RFP (Radio Frequency Processor), power amplifier module PA (Power Amplifier) processes, radiofrequency signal after amplification is gone out by antenna transmission.
Nonlinear characteristic due to power amplifier PA, when input signal makes power amplifier work in saturation region, pre-distortion technology can not further improve the linear index of power amplifier, in general real system, always adopt the technology of peak clipping CFR+ digital pre-distortion technology DPD, peak clipping technology is to improve an important support point of power amplification efficiency.Conventional peak clipping at present realizes technology and mainly contains peak value window, baseband coding, three kinds of methods of pulse-shaping.Wherein, the principle of pulse-shaping peak clipping technology based on linear system, by producing signal and a primary signal contrary with processed signal envelope, superpose, can guarantee that on the one hand the distortion factor that peak clipping causes is less, use on the other hand flexibly, the filter that is used for generating superposed signal by configuration can be supported the peak clipping processing of multiple types (GSM, UMTS, CDMA, TD-SCDMA, LTE, WIMAX).
When Digital IF Processing system is processed the data of many antennas, for the treatment channel that each road antenna configuration is special is processed, each passage includes Digital Up Convert ,He road, peak clipping, digital pre-distortion, RFP, power amplifier processing.Because peak clipping Processing Algorithm is complicated, take great amount of hardware resources (such as, storage resources), therefore, if each passage is carried out respectively to peak clipping processing, hardware resource consumption is large, realizes cost high.
Therefore, in order to save hardware resource expense, multiple types signal is unified to process in same system, need to improve the down link treatment channel of Digital IF Processing system.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of peak clipping implementation method and device, by the multiplexing same peak clipping processing module of multichannel, saved the hardware resource expense of Digital IF Processing system, by the flexible configuration to the filter coefficient of each passage, realized the peak clipping of the mixed mould of multiple types in interchannel and passage and processed.
In order to solve the problems of the technologies described above, the invention provides a kind of peak clipping implementation method, be applied in Digital IF Processing system, this Digital IF Processing system comprises a plurality of passages, the output signal that participates in the multiplexing passage He road module of peak clipping outputs in same peak-clipping module, and the method comprises:
Determine and participate in multiplexing passage number n, the peak clipping thresholding of each passage and the interpolation multiple a of interpolation filter of peak clipping; For each channel allocation is for preserving the memory space of filter coefficient; Wherein, a is integer;
The output signal that participates in n multiplexing passage He road module of peak clipping is outputed in same peak-clipping module and carries out respectively filtering interpolation, will according to predetermined sequential precedence relationship, be multiplexed to an original multiplexed signal in road through filtering interpolation Hou Gehe road signal;
Utilize peak clipping thresholding and the filter coefficient of each passage to process and obtain filtered multiplexed signal original multiplexed signal, will after original multiplexed signal time delay, subtract each other with described filtered multiplexed signal the multiplexed signal obtaining after peak clipping again;
Multiplexed signal after described peak clipping is separated to the peak clipping deal with data that multiple connection obtains each passage according to the sequential precedence relationship of each passage, the peak clipping deal with data of each passage is outputed in the digital pre-distortion DPD module of this passage.
Further, utilize peak clipping thresholding and the filter coefficient of each passage to process and obtain filtered multiplexed signal original multiplexed signal, comprise: utilize the peak clipping thresholding of each passage to carry out to described original multiplexed signal the peak-data that peak value searching obtains each passage, under the control of the meter reading control signal of each passage, according to the sequential precedence relationship of each passage, read successively the filter coefficient of each passage, the filter coefficient of the peak-data of each passage and this passage is multiplied each other and obtains filtered multiplexed signal, to after original multiplexed signal time delay, subtract each other with described filtered multiplexed signal the multiplexed signal obtaining after peak clipping again.
Further, determine and participate in multiplexing passage number n, the peak clipping thresholding of each passage and the interpolation multiple a of interpolation filter of peak clipping, comprising: according to bandwidth requirement, determine n and a, a=b/n; The ratio of the data sampling rate of the clock frequency Yu He road module that wherein, b is peak-clipping module; B is integer.
Further, the interpolation filter of each passage adopts single-stage interpolation filter, or adopts the cascade of N level interpolation filter.
Further, for each channel allocation is for preserving the memory space of filter coefficient, comprise: the filter coefficient that calculates this passage according to the standard information of each passage and bandwidth information, in unified memory, the filter coefficient of each passage is kept at this channel allocation to memory space in; Wherein, standard information comprises unitary system formula information or mixed moulded-on type information.
Further, to according to predetermined sequential precedence relationship, be multiplexed to an original multiplexed signal in road through filtering interpolation Hou Gehe road signal, comprise: in n time slot, transmit the output signal of the interpolation filter of each passage, each passage i is corresponding to fixing time slot j; Multiplexed signal after described peak clipping is separated to the peak clipping deal with data that multiple connection obtains each passage according to the sequential precedence relationship of each passage, comprising: in n time slot, transmit the peak clipping deal with data of each passage, each passage i is corresponding to fixing time slot j; Wherein, 1≤i≤n, 1≤j≤n.
In order to solve the problems of the technologies described above, the present invention also provides a kind of peak clipping implement device, be applied in Digital IF Processing system, this Digital IF Processing system comprises a plurality of passages, the output signal that participates in the multiplexing passage He road module of peak clipping outputs in same peak-clipping module, and this device comprises:
Configuration module, participates in multiplexing passage number n, the peak clipping thresholding of each passage and the interpolation multiple a of interpolation filter of peak clipping for determining; For each channel allocation is for preserving the memory space of filter coefficient; Wherein, a is integer;
Peak clipping input module, for the output signal that participates in n multiplexing passage He road module of peak clipping is outputed to same peak-clipping module, carry out respectively filtering interpolation, will according to predetermined sequential precedence relationship, be multiplexed to an original multiplexed signal in road through filtering interpolation Hou Gehe road signal;
Peak clipping processing module, for utilizing peak clipping thresholding and the filter coefficient of each passage to process and obtain filtered multiplexed signal original multiplexed signal, will after original multiplexed signal time delay, subtract each other with described filtered multiplexed signal the multiplexed signal obtaining after peak clipping again;
Peak clipping output module, for the multiplexed signal after described peak clipping is separated to the peak clipping deal with data that multiple connection obtains each passage according to the sequential precedence relationship of each passage, outputs to the peak clipping deal with data of each passage in the digital pre-distortion DPD module of this passage.
Further, utilize peak clipping thresholding and the filter coefficient of each passage to process and obtain filtered multiplexed signal original multiplexed signal, comprise: utilize the peak clipping thresholding of each passage to carry out to described original multiplexed signal the peak-data that peak value searching obtains each passage, under the control of the meter reading control signal of each passage, according to the sequential precedence relationship of each passage, read successively the filter coefficient of each passage, the filter coefficient of the peak-data of each passage and this passage is multiplied each other and obtains filtered multiplexed signal, to after original multiplexed signal time delay, subtract each other with described filtered multiplexed signal the multiplexed signal obtaining after peak clipping again.
Further, determine and participate in multiplexing passage number n, the peak clipping thresholding of each passage and the interpolation multiple a of interpolation filter of peak clipping, comprising: according to bandwidth requirement, determine n and a, a=b/n; The ratio of the data sampling rate of the clock frequency Yu He road module that wherein, b is peak-clipping module; B is integer.
Further, the interpolation filter of each passage adopts single-stage interpolation filter, or adopts the cascade of N level interpolation filter.
Further, for each channel allocation is for preserving the memory space of filter coefficient, comprise: the filter coefficient that calculates this passage according to the standard information of each passage and bandwidth information, in unified memory, the filter coefficient of each passage is kept at this channel allocation to memory space in; Wherein, standard information comprises unitary system formula information or mixed moulded-on type information.
Further, to according to predetermined sequential precedence relationship, be multiplexed to an original multiplexed signal in road through filtering interpolation Hou Gehe road signal, comprise: in n time slot, transmit the output signal of the interpolation filter of each passage, each passage i is corresponding to fixing time slot j; Multiplexed signal after described peak clipping is separated to the peak clipping deal with data that multiple connection obtains each passage according to the sequential precedence relationship of each passage, comprising: in n time slot, transmit the peak clipping deal with data of each passage, each passage i is corresponding to fixing time slot j; Wherein, 1≤i≤n, 1≤j≤n.
Compared with prior art, a kind of peak clipping implementation method provided by the invention and device, determine and participate in the multiplexing passage number of peak clipping, the peak clipping thresholding of each passage and the interpolation multiple of interpolation filter, for each channel allocation is for preserving the memory space of filter coefficient, each passage He road signal is outputed to and in same peak-clipping module, carries out respectively filtering interpolation, to according to predetermined sequential precedence relationship, be multiplexed to an original multiplexed signal in road through filtering interpolation Hou Gehe road signal, utilize peak clipping thresholding and the filter coefficient of each passage to carry out peak clipping processing to original multiplexed signal, then separating the peak clipping deal with data that multiple connection obtains each passage outputs in the DPD module of each passage.The present invention, by the multiplexing same peak clipping processing module of multichannel, has saved the hardware resource expense of system, by the configuration to the filter coefficient of each passage, has realized the peak clipping of the mixed mould of multiple types in interchannel and passage and has processed.
Accompanying drawing explanation
Fig. 1 is the treatment channel schematic diagram of the down link of Digital IF Processing system in prior art.
Fig. 2 is the flow chart of the peak clipping implementation method of the embodiment of the present invention.
Fig. 3 is the schematic diagram of the Digital IF Processing system of the embodiment of the present invention.
Fig. 4 is the inter-process structural representation of the peak-clipping module in Fig. 3.
Fig. 5 is the structural representation of the peak clipping implement device of the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.It should be noted that, in the situation that not conflicting, the embodiment in the application and the feature in embodiment be combination in any mutually.
As shown in Figure 2, the embodiment of the present invention provides a kind of and has been applied in Digital IF Processing system, this Digital IF Processing system comprises a plurality of passages, and the output signal that participates in the multiplexing passage He road module of peak clipping outputs in same peak-clipping module, and the method comprises:
S10, determines and participates in multiplexing passage number n, the peak clipping thresholding of each passage and the interpolation multiple a of interpolation filter of peak clipping; For each channel allocation is for preserving the memory space of filter coefficient; Wherein, a is integer;
S20, the output signal that participates in n multiplexing passage He road module of peak clipping is outputed in same peak-clipping module and carries out respectively filtering interpolation, will according to predetermined sequential precedence relationship, be multiplexed to an original multiplexed signal in road through filtering interpolation Hou Gehe road signal;
S30, utilizes the peak clipping thresholding of each passage and filter coefficient to process and obtain filtered multiplexed signal original multiplexed signal, will after original multiplexed signal time delay, subtract each other the multiplexed signal obtaining after peak clipping again with described filtered multiplexed signal;
S40, separates according to the sequential precedence relationship of each passage the peak clipping deal with data that multiple connection obtains each passage by the multiplexed signal after described peak clipping, the peak clipping deal with data of each passage is outputed in the DPD module of this passage.
Wherein, step S10 further comprises following feature:
Wherein, determine and participate in multiplexing passage number n, the peak clipping thresholding of each passage and the interpolation multiple a of interpolation filter of peak clipping, comprising: according to bandwidth requirement, determine n and a, a=b/n; The ratio of the data sampling rate of the clock frequency Yu He road module that wherein, b is peak-clipping module (data sampling rate of the clock frequency /He road module of b=peak-clipping module); B is integer;
Such as the data sampling rate of ，He road module is 10MHz, the clock frequency of peak-clipping module is 40MHz, b=40MHz/10MHz=4; As n=1, the interpolation multiple a=4 of interpolation filter; As n=2, the interpolation multiple a=2 of interpolation filter; As n=4, the interpolation multiple a=1 of interpolation filter.
Wherein, when the bandwidth of system processing increases, can reduce and participate in the multiplexing passage number n of peak clipping; Such as, when the bandwidth processed when system is higher, due to peak clipping, to process institute's filter order that requires higher, therefore can by storage resources all configuration to a certain passage, use, i.e. n=1, interpolation filter interpolation multiple is set to a=b; Hour, due to peak clipping, to process institute's filter order that requires lower, therefore storage resources can be divided into n little section, configures respectively to n passage use for the bandwidth of processing when system, and now interpolation filter interpolation multiple arranges a=b/n;
Wherein, the interpolation filter of each passage adopts single-stage interpolation filter, or adopts the cascade of N level interpolation filter; Wherein, interpolation filter can be half-band filter.
Wherein, for each channel allocation is for preserving the memory space of filter coefficient, comprise: the filter coefficient that calculates this passage according to the standard information of each passage and bandwidth information, in unified memory, the filter coefficient of each passage is kept at this channel allocation to memory space in; Wherein, standard information comprises unitary system formula information or mixed moulded-on type information;
Wherein, single standard comprises: GSM standard, UMTS standard, CDMA standard, TD-SCDMA standard, LTE standard or WIMAX standard; Mixed moulded-on type is the combination in any of above-mentioned single standard.
Step S20 further comprises following feature:
By being multiplexed to an original multiplexed signal in road through filtering interpolation Hou Gehe road signal according to predetermined sequential precedence relationship, comprising: in n time slot, transmit the output signal of the interpolation filter of each passage, each passage i is corresponding to fixing time slot j; Also, each passage timesharing takies the data transmission channel of peak-clipping module; Wherein, 1≤i≤n, 1≤j≤n.
Step S30 further comprises following feature:
Wherein, as shown in Figure 4, utilize peak clipping thresholding and the filter coefficient of each passage to process and obtain filtered multiplexed signal original multiplexed signal, comprise: utilize the peak clipping thresholding of each passage to carry out to described original multiplexed signal the peak-data that peak value searching obtains each passage, under the control of the meter reading control signal of each passage, according to the sequential precedence relationship of each passage, read successively the filter coefficient of each passage, the filter coefficient of the peak-data of each passage and this passage is multiplied each other and obtains filtered multiplexed signal, to after original multiplexed signal time delay, subtract each other with described filtered multiplexed signal the multiplexed signal obtaining after peak clipping again.
Step S40 further comprises following feature:
Wherein, multiplexed signal after described peak clipping is separated to the peak clipping deal with data that multiple connection obtains each passage according to the sequential precedence relationship of each passage, comprise: the peak clipping deal with data of transmitting each passage in n time slot, each passage i is corresponding to fixing time slot j, also, each passage timesharing takies the output data channel of peak-clipping module; Wherein, 1≤i≤n, 1≤j≤n.
As shown in Figure 5, the embodiment of the present invention provides a kind of peak clipping implement device, is applied in Digital IF Processing system, and this Digital IF Processing system comprises a plurality of passages, the output signal that participates in the multiplexing passage He road module of peak clipping outputs in same peak-clipping module, and this device comprises:
Configuration module, participates in multiplexing passage number n, the peak clipping thresholding of each passage and the interpolation multiple a of interpolation filter of peak clipping for determining; For each channel allocation is for preserving the memory space of filter coefficient; Wherein, a is integer;
Peak clipping input module, for the output signal that participates in n multiplexing passage He road module of peak clipping is outputed to same peak-clipping module, carry out respectively filtering interpolation, will according to predetermined sequential precedence relationship, be multiplexed to an original multiplexed signal in road through filtering interpolation Hou Gehe road signal;
Peak clipping processing module, for utilizing peak clipping thresholding and the filter coefficient of each passage to process and obtain filtered multiplexed signal original multiplexed signal, will after original multiplexed signal time delay, subtract each other with described filtered multiplexed signal the multiplexed signal obtaining after peak clipping again;
Peak clipping output module, for the multiplexed signal after described peak clipping is separated to the peak clipping deal with data that multiple connection obtains each passage according to the sequential precedence relationship of each passage, outputs to the peak clipping deal with data of each passage in the digital pre-distortion DPD module of this passage.
Wherein, utilize peak clipping thresholding and the filter coefficient of each passage to process and obtain filtered multiplexed signal original multiplexed signal, comprise: utilize the peak clipping thresholding of each passage to carry out to described original multiplexed signal the peak-data that peak value searching obtains each passage, under the control of the meter reading control signal of each passage, according to the sequential precedence relationship of each passage, read successively the filter coefficient of each passage, the filter coefficient of the peak-data of each passage and this passage is multiplied each other and obtains filtered multiplexed signal, to after original multiplexed signal time delay, subtract each other with described filtered multiplexed signal the multiplexed signal obtaining after peak clipping again
Wherein, determine and participate in multiplexing passage number n, the peak clipping thresholding of each passage and the interpolation multiple a of interpolation filter of peak clipping, comprising: according to bandwidth requirement, determine n and a, a=b/n; The ratio of the data sampling rate of the clock frequency Yu He road module that wherein, b is peak-clipping module; B is integer.
Wherein, when the bandwidth of system processing increases, can reduce and participate in the multiplexing passage number n of peak clipping.
Wherein, the interpolation filter of each passage adopts single-stage interpolation filter, or adopts N level interpolation filter cascade device.
Wherein, for each channel allocation is for preserving the memory space of filter coefficient, comprise: the filter coefficient that calculates this passage according to the standard information of each passage and bandwidth information, in unified memory, the filter coefficient of each passage is kept at this channel allocation to memory space in; Wherein, standard information comprises unitary system formula information or mixed moulded-on type information.
Wherein, by being multiplexed to an original multiplexed signal in road through filtering interpolation Hou Gehe road signal according to predetermined sequential precedence relationship, comprising: in n time slot, transmit the output signal of the interpolation filter of each passage, each passage i is corresponding to fixing time slot j; Multiplexed signal after described peak clipping is separated to the peak clipping deal with data that multiple connection obtains each passage according to the sequential precedence relationship of each passage, comprising: in n time slot, transmit the peak clipping deal with data of each passage, each passage i is corresponding to fixing time slot j; Wherein, 1≤i≤n, 1≤j≤n.
A kind of peak clipping implementation method and device that above-described embodiment provides, determine and participate in multiplexing passage number, the peak clipping thresholding of each passage and the interpolation multiple of interpolation filter of peak clipping, for each channel allocation is for preserving the memory space of filter coefficient; Each passage He road signal is outputed to and in same peak-clipping module, carries out respectively filtering interpolation, to according to predetermined sequential precedence relationship, be multiplexed to an original multiplexed signal in road through filtering interpolation Hou Gehe road signal, utilize peak clipping thresholding and the filter coefficient of each passage to carry out peak clipping processing to original multiplexed signal, the multiplexed signal after processing is separated the peak clipping deal with data that multiple connection obtains each passage and is outputed in the DPD module of each passage.The present invention, by the multiplexing same peak clipping processing module of multichannel, has saved the hardware resource expense of system, by the configuration to the filter coefficient of each passage, has realized the peak clipping of the mixed mould of multiple types in interchannel and passage and has processed.
One of ordinary skill in the art will appreciate that all or part of step in said method can come instruction related hardware to complete by program, described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can realize with one or more integrated circuits, and correspondingly, each the module/unit in above-described embodiment can adopt the form of hardware to realize, and also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
It should be noted that; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (12)
1. a peak clipping implementation method, is applied in Digital IF Processing system, and this Digital IF Processing system comprises a plurality of passages, and the output signal that participates in the multiplexing passage He road module of peak clipping outputs in same peak-clipping module, and the method comprises:
Determine and participate in multiplexing passage number n, the peak clipping thresholding of each passage and the interpolation multiple a of interpolation filter of peak clipping; For each channel allocation is for preserving the memory space of filter coefficient; Wherein, a is integer;
The output signal that participates in n multiplexing passage He road module of peak clipping is outputed in same peak-clipping module and carries out respectively filtering interpolation, will according to predetermined sequential precedence relationship, be multiplexed to an original multiplexed signal in road through filtering interpolation Hou Gehe road signal;
Utilize peak clipping thresholding and the filter coefficient of each passage to process and obtain filtered multiplexed signal original multiplexed signal, will after original multiplexed signal time delay, subtract each other with described filtered multiplexed signal the multiplexed signal obtaining after peak clipping again;
Multiplexed signal after described peak clipping is separated to the peak clipping deal with data that multiple connection obtains each passage according to the sequential precedence relationship of each passage, the peak clipping deal with data of each passage is outputed in the digital pre-distortion DPD module of this passage.
2. the method for claim 1, is characterized in that:
Utilize peak clipping thresholding and the filter coefficient of each passage to process and obtain filtered multiplexed signal original multiplexed signal, comprise: utilize the peak clipping thresholding of each passage to carry out to described original multiplexed signal the peak-data that peak value searching obtains each passage, under the control of the meter reading control signal of each passage, according to the sequential precedence relationship of each passage, read successively the filter coefficient of each passage, the filter coefficient of the peak-data of each passage and this passage is multiplied each other and obtains filtered multiplexed signal, to after original multiplexed signal time delay, subtract each other with described filtered multiplexed signal the multiplexed signal obtaining after peak clipping again.
3. method as claimed in claim 1 or 2, is characterized in that:
Determine and participate in multiplexing passage number n, the peak clipping thresholding of each passage and the interpolation multiple a of interpolation filter of peak clipping, comprising: according to bandwidth requirement, determine n and a, a=b/n; The ratio of the data sampling rate of the clock frequency Yu He road module that wherein, b is peak-clipping module; B is integer.
4. method as claimed in claim 1 or 2, is characterized in that:
The interpolation filter of each passage adopts single-stage interpolation filter, or adopts the cascade of N level interpolation filter.
5. method as claimed in claim 1 or 2, is characterized in that:
For each channel allocation is for preserving the memory space of filter coefficient, comprise: the filter coefficient that calculates this passage according to the standard information of each passage and bandwidth information, in unified memory, the filter coefficient of each passage is kept at this channel allocation to memory space in;
Wherein, standard information comprises unitary system formula information or mixed moulded-on type information.
6. method as claimed in claim 1 or 2, is characterized in that:
By being multiplexed to an original multiplexed signal in road through filtering interpolation Hou Gehe road signal according to predetermined sequential precedence relationship, comprising: in n time slot, transmit the output signal of the interpolation filter of each passage, each passage i is corresponding to fixing time slot j;
Multiplexed signal after described peak clipping is separated to the peak clipping deal with data that multiple connection obtains each passage according to the sequential precedence relationship of each passage, comprising: in n time slot, transmit the peak clipping deal with data of each passage, each passage i is corresponding to fixing time slot j; Wherein, 1≤i≤n, 1≤j≤n.
7. a peak clipping implement device, is applied in Digital IF Processing system, and this Digital IF Processing system comprises a plurality of passages, and the output signal that participates in the multiplexing passage He road module of peak clipping outputs in same peak-clipping module, and this device comprises:
Configuration module, participates in multiplexing passage number n, the peak clipping thresholding of each passage and the interpolation multiple a of interpolation filter of peak clipping for determining; For each channel allocation is for preserving the memory space of filter coefficient; Wherein, a is integer;
Peak clipping input module, for the output signal that participates in n multiplexing passage He road module of peak clipping is outputed to same peak-clipping module, carry out respectively filtering interpolation, will according to predetermined sequential precedence relationship, be multiplexed to an original multiplexed signal in road through filtering interpolation Hou Gehe road signal;
Peak clipping processing module, for utilizing peak clipping thresholding and the filter coefficient of each passage to process and obtain filtered multiplexed signal original multiplexed signal, will after original multiplexed signal time delay, subtract each other with described filtered multiplexed signal the multiplexed signal obtaining after peak clipping again;
Peak clipping output module, for the multiplexed signal after described peak clipping is separated to the peak clipping deal with data that multiple connection obtains each passage according to the sequential precedence relationship of each passage, outputs to the peak clipping deal with data of each passage in the digital pre-distortion DPD module of this passage.
8. device as claimed in claim 7, is characterized in that:
Utilize peak clipping thresholding and the filter coefficient of each passage to process and obtain filtered multiplexed signal original multiplexed signal, comprise: utilize the peak clipping thresholding of each passage to carry out to described original multiplexed signal the peak-data that peak value searching obtains each passage, under the control of the meter reading control signal of each passage, according to the sequential precedence relationship of each passage, read successively the filter coefficient of each passage, the filter coefficient of the peak-data of each passage and this passage is multiplied each other and obtains filtered multiplexed signal, to after original multiplexed signal time delay, subtract each other with described filtered multiplexed signal the multiplexed signal obtaining after peak clipping again.
9. install as claimed in claim 7 or 8, it is characterized in that:
Determine and participate in multiplexing passage number n, the peak clipping thresholding of each passage and the interpolation multiple a of interpolation filter of peak clipping, comprising: according to bandwidth requirement, determine n and a, a=b/n; The ratio of the data sampling rate of the clock frequency Yu He road module that wherein, b is peak-clipping module; B is integer.
10. install as claimed in claim 7 or 8, it is characterized in that:
The interpolation filter of each passage adopts single-stage interpolation filter, or adopts the cascade of N level interpolation filter.
11. install as claimed in claim 7 or 8, it is characterized in that:
For each channel allocation is for preserving the memory space of filter coefficient, comprise: the filter coefficient that calculates this passage according to the standard information of each passage and bandwidth information, in unified memory, the filter coefficient of each passage is kept at this channel allocation to memory space in;
Wherein, standard information comprises unitary system formula information or mixed moulded-on type information.
12. install as claimed in claim 7 or 8, it is characterized in that:
By being multiplexed to an original multiplexed signal in road through filtering interpolation Hou Gehe road signal according to predetermined sequential precedence relationship, comprising: in n time slot, transmit the output signal of the interpolation filter of each passage, each passage i is corresponding to fixing time slot j;
Multiplexed signal after described peak clipping is separated to the peak clipping deal with data that multiple connection obtains each passage according to the sequential precedence relationship of each passage, comprising: in n time slot, transmit the peak clipping deal with data of each passage, each passage i is corresponding to fixing time slot j; Wherein, 1≤i≤n, 1≤j≤n.
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