CN201360268Y - Peak clipping device based on peak detection - Google Patents
Peak clipping device based on peak detection Download PDFInfo
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- CN201360268Y CN201360268Y CNU2009200042193U CN200920004219U CN201360268Y CN 201360268 Y CN201360268 Y CN 201360268Y CN U2009200042193 U CNU2009200042193 U CN U2009200042193U CN 200920004219 U CN200920004219 U CN 200920004219U CN 201360268 Y CN201360268 Y CN 201360268Y
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Abstract
The utility model provides a peak clipping device based on peak detection. I channel data and Q channel data of initial intermediate frequency data go through modulus calculation through a modulus calculation module, a threshold composition module and the modulus calculation module transmit modulus larger than a threshold to a scaling factor calculation module to calculate the scaling factor, and the maximum scaling factor within a preset distance can be detected through a maximum detection module; the I channel data go through data delay through a data delay module and then carry out multiplication with the maximum scaling factor through a multiplier unit, and go through pulse canceling processing through a pulse canceling formation module; the Q channel data go through data delay through the data delay module and then carry out multiplication with the maximum scaling factor through the multiplier unit, and go through pulse canceling processing through the pulse canceling formation module; the initial intermediate frequency data go through data delay through the data delay module and then carry out corresponding point addition with data which go through pulse canceling processing through a summation module. The peak clipping device based on peak detection can carry out peak clipping to peak data with different widths.
Description
Technical field
The utility model relates to the signal processing technology in the communication system, particularly a kind of peak cutting device that detects based on peak value.
Background technology
Present 3G (Third Generation) Moblie (3rd Generation, the application of multi-transceiver technology can bring the peak-to-average force ratio problem of higher 3G), if there is not peak cutting device generally speaking, the efficient of power amplifier has only 10%, therefore in order to improve power amplification efficiency, reduce power amplifier pushing back on peak value, must use the peak clipping algorithm.Several peak-value detection methods relatively more commonly used at present have: hard-limiting detection method and maximum detection method.
Wherein, the hard-limiting detection method is the thresholding according to default, to all think noise greater than the signal of thresholding, the advantage of this detection method is fairly simple, and still, this peak value detection mode is applied in the peak clipping algorithm, can make signal have the characteristic at sharp edge and sharp peak, can to produce significant out of band spectrum unusual the of short duration duration at the sudden change of signal and peak clipping edge in the peak clipping process, and therefore for example frequency spectrum distortion, monkey chatter, spread spectrum etc. can reduce signal transfer quality.
The maximum detection method, the resource that its advantage just is to use is less, and (Field Programmable Gate Array, FPGA) resource of middle multiplier is less particularly to use field programmable gate array.This method judges at first whether the mould value of current demand signal surpasses thresholding, next judges that the mould value of current demand signal is the mould value greater than previous signal, whether and,, then think and found maximum if these two conditions all satisfy greater than the mould value of a back signal.Though reduced multiplier resources on the method for this detection method with respect to hard peak clipping, owing to it need be handled all maximums, so there was the peak clipping problem easily.
The utility model content
The purpose of this utility model is, a kind of peak cutting device that detects based on peak value is provided, and can solve the peak clipping problem.
The peak cutting device that detects based on peak value of the present utility model, wherein, the I circuit-switched data of original intermediate frequency data and Q circuit-switched data are carried out the mould value through mould value computing module and are calculated, the mould value that calculates enters with thresholding comparison module and corresponding threshold value and compares, to send to the scale factor calculation module greater than the mould value of described threshold value, the scale factor calculation module is calculated scale factor according to described mould value greater than threshold value, and the maximum detection module detects the maximum ratio factor in the preset distance according to described scale factor;
The I circuit-switched data is carried out multiplication with the detected maximum ratio factor of described maximum detection module by I road multiplier and is calculated after I circuit-switched data Postponement module carries out data delay, and result of calculation inputed to offset the pulse shaping module and offset burst process, wherein, be the time that peak value detects the time of delay of described I circuit-switched data;
The Q circuit-switched data is carried out multiplication with the detected maximum ratio factor of described maximum detection module by Q road multiplier and is calculated after Q circuit-switched data Postponement module carries out data delay, and result of calculation inputed to offset the pulse shaping module and offset burst process, wherein, be the time that described peak value detects the time of delay of described Q circuit-switched data;
Described original intermediate frequency data carries out after the data delay carrying out corresponding points addition through summation module with the described data that offset after the burst process that offset the output of pulse shaping module under the consistent condition of phase place through the intermediate frequency data Postponement module.
Wherein, comprise that further filter forms module, when original intermediate frequency data is the single carrier data, carries out described single carrier data IF spot according to described carrier wave after prototype filter filtering to move with described shift frequency oscillation treatment module corresponding frequency spectrum.
Wherein, when original intermediate frequency data is the multicarrier data, described filter forms module, described multicarrier data different frequent points according to each carrier wave after prototype filter filtering is carried out moving with described shift frequency oscillation treatment module corresponding frequency spectrum, again will be through the corresponding addition of each the carrier filter coefficient behind the frequency spectrum shift, the coefficient after the addition is exported after divided by carrier number.
Wherein, further comprise baseband signal module, molding filtration module, digital up-sampled module, shift frequency oscillation treatment module, wherein, when the baseband signal in the described baseband signal module is the single carrier data, after carrying out the moulding Filtering Processing via described molding filtration module, enter the digital up-sampled module and carry out the digital up-sampled processing, enter shift frequency oscillation treatment module then and carry out the original intermediate frequency data that frequency spectrum shift is handled the back output single carrier.
When baseband signal is the multicarrier data, comprise that further carrier wave closes path processor, be used for that the data after the described shift frequency oscillation treatment module frequency spectrum shift processing are carried out carrier wave and close the road processing, form the original intermediate frequency data that closes the later multicarrier in road.
The beneficial effects of the utility model are: according to the peak cutting device that detects based on peak value of the present utility model, can solve the peak clipping problem, and can dynamically change the ultimate range of setting according to system configuration, effectively carry out peak clipping at different width peaks data; In addition, (Peak Average Ratio PAR) can improve about 0.7dB to compare peak-to-average force ratio of the present utility model with the hard-limiting detection method.
Description of drawings
Fig. 1 is the framework schematic diagram based on peak detection system;
Fig. 2 is the schematic diagram of maximum value search process;
Fig. 3 is the schematic diagram that offsets the pulse shaping process.
Embodiment
Below, 1～3 describe the peak cutting device that detects based on peak value of the present utility model in detail with reference to the accompanying drawings.
As shown in Figure 1, baseband signal in the baseband signal module 101 (can be single carrier or multicarrier data), after process molding filtration module 102 is carried out the moulding Filtering Processing, enter digital up-sampled module 103 and carry out the digital up-sampled processing, enter shift frequency oscillation treatment module 104 then, when baseband signal is the single carrier data, the original intermediate frequency data of output single carrier after shift frequency oscillation treatment module 104 is carried out the frequency spectrum shift processing; When baseband signal is the multicarrier data, comprise that further carrier wave closes path processor, be used for that the data after the processing of shift frequency oscillation treatment module 104 frequency spectrum shifts are carried out carrier wave and close the road processing, form the original intermediate frequency data that closes the later multicarrier in road.
As shown in Figure 1, the peak cutting device that detects based on new peak value of the present utility model comprises: intermediate frequency data Postponement module 105, I circuit-switched data Postponement module 106, mould value computing module 107, with thresholding comparison module 108, scale factor calculation module 109, maximum detection module 110, offset pulse shaping module 111, filter forms module 112, Q circuit-switched data Postponement module 113 and summation module 114.
Wherein, the I circuit-switched data of original intermediate frequency data and Q circuit-switched data are carried out the mould value through mould value computing module 107 and are calculated, the mould value that calculates enters with thresholding comparison module 108 and corresponding threshold value and compares, to send to scale factor calculation module 109 greater than the mould value of threshold value, wherein, corresponding threshold value is by default; Scale factor calculation module 109 was according to calculating scale factor greater than the mould value of threshold value, and maximum detection module 110 detects the interior maximum ratio factor of preset distance according to the scale factor that calculates, and wherein, preset distance is by default.
The I circuit-switched data is carried out multiplication with the maximum detection module 110 detected maximum ratio factors by I road multiplier and is calculated after I circuit-switched data Postponement module 106 carries out data delay, and result of calculation inputed to offsets pulse shaping module 111 and offset burst process;
The Q circuit-switched data is carried out multiplication with the maximum detection module 110 detected maximum ratio factors by Q road multiplier and is calculated after Q circuit-switched data Postponement module 113 carries out data delay, and result of calculation inputed to offsets pulse shaping module 111 and offset burst process;
Original intermediate frequency data carries out after the data delay carrying out corresponding points addition through summation module 114 with the data that offset after the burst process that offset that pulse shaping module 111 exports under the consistent condition of phase place through intermediate frequency data Postponement module 105.
Particularly, intermediate frequency data Postponement module 105 postpones the original intermediate frequency data of importing, and is the time of peak value detection and offsets the pulse build-up time sum this time of delay.
I circuit-switched data Postponement module 106 postpones the I circuit-switched data, and be the time that peak value detects this time of delay.Here to guarantee that detected scale factor is corresponding with original intermediate frequency data.Wherein, time of detecting of peak value comprise mould value computing time, with thresholding relatively time, scale factor calculation time and maximum detection time.
Mould value computing module 107 is carrying out the mould value when calculating, and can use the method for rotation of coordinate to ask the mould value of signal, the resource that can save multiplier.Wherein,
Wherein, I represents I road in-phase data; Q represents Q road orthogonal data.
Because maximum can appear in the part greater than threshold value, and maximum can not occur less than the part of threshold value, therefore, when carrying out the threshold value comparison, will send to the scale factor calculation module greater than the mould value of threshold value with thresholding comparison module 108.
Scale factor calculation module 109 is calculated scale factor according to what detect greater than the mould value of thresholding, wherein, scale factor=(greater than the mould value-threshold value of thresholding)/greater than the mould value of thresholding.Be set to 0 corresponding to scale factor less than the mould value of threshold value.
Particularly, as shown in Figure 2, generally be original position with the radio frames, first data of radio frames correspondence as the initialization peak value, are searched first maximal peak A point, will put A and be output as a peak point; The next one that is close to peak point A is higher than threshold value point a1 point and is set to " interim peak value scale factor point ", searches next maximum peak point B point, supposes that the distance that the a1 point is ordered to B is X, and X less than minimum peak apart from M; The B point has replaced the a1 point, becomes " interim peak value scale factor point "; Suppose the next maximum point C that searches, the distance of ordering with current " interim peak value scale factor point " B is Y, and Y＜M; Because the value that the value that C is ordered is ordered less than B so the C point is not a peak point, can not replace current " interim peak value scale factor point ", gives up the C point, searches for next maximum point; The distance that the next maximum point D point that searches and current " interim peak value scale factor point " B are ordered is designated as Z, and Z＞M.The D point is a peak point so; New " interim peak value scale factor point " d1 point is set; Repeat said process, export new peak point; Final output maximum sequence.
Offset pulse shaping module 111, carry out dot product, produce and offset pulse according to maximum sequence and filter formation module 112.
As shown in Figure 3, maximum sequence and filter are formed module carry out dot product, No. 1 multiplier and peak point A carry out dot product, No. 2 multipliers and peak point B carry out dot product, No. 3 multipliers and peak point C carry out dot product, then the result after the dot product are carried out addition, offset pulse thereby form.Here be that example describes with three multipliers, in the system of reality, can dispose the number of multiplier.
Q circuit-switched data Postponement module 113 when the Q circuit-switched data is postponed, equals the time that peak value detects this time of delay, will guarantee to want detected scale factor corresponding with original intermediate frequency data here.Wherein, time of detecting of peak value comprise mould value computing time, with thresholding relatively time, scale factor calculation time and maximum detection time.
In sum,, can solve the peak clipping problem, and can dynamically change the ultimate range of setting, effectively carry out peak clipping at different width peaks data according to system configuration according to the peak cutting device that detects based on peak value of the present utility model; In addition, the relative hard-limiting detection method of the utility model peak-to-average force ratio PAR can improve about 0.7dB.
More than be in order to make those of ordinary skills understand the utility model; and to detailed description that the utility model carried out; but can expect; in the scope that does not break away from claim of the present utility model and contained, can also make other variation and modification, these variations and revising all in protection range of the present utility model.
Claims (5)
1. peak cutting device that detects based on peak value, it is characterized in that, the I circuit-switched data of original intermediate frequency data and Q circuit-switched data are carried out the mould value through mould value computing module (107) and are calculated, the mould value that calculates enters with thresholding comparison module (108) and corresponding threshold value and compares, to send to scale factor calculation module (109) greater than the mould value of described threshold value, scale factor calculation module (109) is calculated scale factor according to described mould value greater than threshold value, and maximum detection module (110) detects the maximum ratio factor in the preset distance according to described scale factor;
The I circuit-switched data is carried out multiplication with the detected maximum ratio factor of described maximum detection module (110) by I road multiplier and is calculated after I circuit-switched data Postponement module (106) carries out data delay, and result of calculation inputed to offset pulse shaping module (111) and offset burst process, wherein, be the time that peak value detects the time of delay of described I circuit-switched data;
The Q circuit-switched data is carried out multiplication with the detected maximum ratio factor of described maximum detection module (110) by Q road multiplier and is calculated after Q circuit-switched data Postponement module (113) carries out data delay, and result of calculation inputed to offset pulse shaping module (111) and offset burst process, wherein, be the time that described peak value detects the time of delay of described Q circuit-switched data;
Described original intermediate frequency data carries out after the data delay carrying out corresponding points addition through summation module (114) with the described data that offset after the burst process that offset pulse shaping module (111) output under the consistent condition of phase place through intermediate frequency data Postponement module (105).
2. the peak cutting device that detects based on peak value as claimed in claim 1, it is characterized in that, comprise that further filter forms module (112), when original intermediate frequency data is the single carrier data, described single carrier data IF spot according to described carrier wave after prototype filter filtering is carried out moving with described shift frequency oscillation treatment module (104) corresponding frequency spectrum.
3. the peak cutting device that detects based on peak value as claimed in claim 2, it is characterized in that, when original intermediate frequency data is the multicarrier data, described filter forms module (112), described multicarrier data different frequent points according to each carrier wave after prototype filter filtering is carried out moving with described shift frequency oscillation treatment module (104) corresponding frequency spectrum, again will be through the corresponding addition of each the carrier filter coefficient behind the frequency spectrum shift, the coefficient after the addition is exported after divided by carrier number.
4. the peak cutting device that detects based on peak value as claimed in claim 1 is characterized in that, further comprises baseband signal module (101), molding filtration module (102), digital up-sampled module (103), shift frequency oscillation treatment module (104), wherein,
When the baseband signal in the described baseband signal module (101) is the single carrier data, after carrying out the moulding Filtering Processing via described molding filtration module (102), enter digital up-sampled module (103) and carry out the digital up-sampled processing, enter shift frequency oscillation treatment module (104) then and carry out the original intermediate frequency data that frequency spectrum shift is handled the back output single carrier.
5. the peak cutting device that detects based on peak value as claimed in claim 4, it is characterized in that, when baseband signal is the multicarrier data, comprise that further carrier wave closes path processor, be used for that the data after the processing of described shift frequency oscillation treatment module (104) frequency spectrum shift are carried out carrier wave and close the road processing, form the original intermediate frequency data that closes the later multicarrier in road.
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| CNU2009200042193U CN201360268Y (en) | 2009-01-21 | 2009-01-21 | Peak clipping device based on peak detection |
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| CNU2009200042193U CN201360268Y (en) | 2009-01-21 | 2009-01-21 | Peak clipping device based on peak detection |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098255A (en) * | 2009-12-15 | 2011-06-15 | 华为技术有限公司 | Method, device and base station for signal combination clipping |
| CN102231719A (en) * | 2011-05-27 | 2011-11-02 | 上海华为技术有限公司 | Wireless system sending signal wave clipping device, transmitter, base station and wave chipping method |
| CN102271105A (en) * | 2010-06-04 | 2011-12-07 | 电信科学技术研究院 | Intermediate frequency design method and device of broadband |
| CN102299883A (en) * | 2010-06-24 | 2011-12-28 | 大唐移动通信设备有限公司 | Crest reduction method and device of broadband signal |
| CN103036840A (en) * | 2012-11-23 | 2013-04-10 | 奥维通信股份有限公司 | Communication method and communication system both based on efficient crest factor reduction (CFR) processing |
| CN103929390A (en) * | 2013-01-14 | 2014-07-16 | 中兴通讯股份有限公司 | Baseband load shifting method and device of LTE system |
| CN111147418A (en) * | 2019-12-27 | 2020-05-12 | 京信通信***（中国）有限公司 | Signal peak-to-average ratio reduction method, device, equipment and storage medium |
-
2009
- 2009-01-21 CN CNU2009200042193U patent/CN201360268Y/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098255A (en) * | 2009-12-15 | 2011-06-15 | 华为技术有限公司 | Method, device and base station for signal combination clipping |
| CN102271105A (en) * | 2010-06-04 | 2011-12-07 | 电信科学技术研究院 | Intermediate frequency design method and device of broadband |
| CN102299883A (en) * | 2010-06-24 | 2011-12-28 | 大唐移动通信设备有限公司 | Crest reduction method and device of broadband signal |
| CN102299883B (en) * | 2010-06-24 | 2014-02-19 | 大唐移动通信设备有限公司 | Crest reduction method and device of broadband signal |
| CN102231719A (en) * | 2011-05-27 | 2011-11-02 | 上海华为技术有限公司 | Wireless system sending signal wave clipping device, transmitter, base station and wave chipping method |
| CN102231719B (en) * | 2011-05-27 | 2014-01-22 | 上海华为技术有限公司 | Wireless system sending signal wave clipping device, transmitter, base station and wave chipping method |
| CN103036840A (en) * | 2012-11-23 | 2013-04-10 | 奥维通信股份有限公司 | Communication method and communication system both based on efficient crest factor reduction (CFR) processing |
| CN103036840B (en) * | 2012-11-23 | 2015-08-19 | 奥维通信股份有限公司 | A kind of communication means based on efficient CFR process and system |
| CN103929390A (en) * | 2013-01-14 | 2014-07-16 | 中兴通讯股份有限公司 | Baseband load shifting method and device of LTE system |
| CN111147418A (en) * | 2019-12-27 | 2020-05-12 | 京信通信***（中国）有限公司 | Signal peak-to-average ratio reduction method, device, equipment and storage medium |
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Granted publication date: 20091209 |