CN104038250B - Relevant peaks checkout gear and correlation peak detecting - Google Patents
Relevant peaks checkout gear and correlation peak detecting Download PDFInfo
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Abstract
The invention discloses a kind of relevant peaks checkout gear and correlation peak detecting.The base-band data stream of relevant peaks checkout gear to input carries out the delay buffer of the scheduled time, carry out moving average filter in the starting and ending moment extraction base-band data stream of the scheduled time and obtain advanced bandpass threshold and delayed bandpass threshold, combine two bandpass threshold and obtain decision threshold, its threshold value is at any time the maximum of the threshold value of two bandpass threshold.The filter value that matched filtering obtains each data point is carried out in 1/3rd scheduled times place's extraction base-band data stream; Successively cumulative filter value obtains the accumulated value of predetermined number, if all the other each accumulated values are all greater than previous accumulated value except last accumulated value, export last accumulated value, and judge whether it exceeds decision threshold, if exceed decision threshold, the correlation of last accumulated value as relevant peaks is exported.The present invention can avoid signal to cause false-alarm in the starting and ending moment because producing sudden change.
Description
Technical field
The present invention relates to spread spectrum technic field, especially a kind of relevant peaks checkout gear, also relates to a kind of correlation peak detecting.
Background technology
In spread spectrum communication, owing to adopting pseudo random sequence to expand signal, so need to have detected acquiring pseudo code when signal despreading by relevant peaks.With realize spreading code go expand and demodulation.In existing spread spectrum communication system, the signal indication that receiver receives is as follows:
Wherein, A is signal power, and V is data message, and P is spreading code, value is only ± and 1, ω be carrier frequency, α is initial phase, n
ct () is band-limited noise, τ is time of delay.When carrying out relevant, adopting matched filter to carry out related operation, being expressed as follows:
In formula, the spreading period of M representative data, x (n) is input signal, h (k) for local spreading code, value be only ± 1, y (n) be correlation.Can find out in conjunction with above-mentioned two formulas, if P and h is identical, so the value of y (n) constantly increases progressively.Time relevant, y (n) is compared with the thresholding of setting, if be greater than thresholding, represents signal synchronously, y (n) for despreading with, if be less than thresholding, expression does not capture useful signal.Therefore, the setting of thresholding detects relevant peaks decisive influence.
The correlation peak detecting of prior art is all arrange fixing thresholding or set thresholding based on experience value usually, but, the signal that receiver receives usually is undergone mutation at initial time and finish time and is trailed and produce noise, and these thresholdings are all single thresholdings, scope is wide not, these noise signals these noise signals can not be covered, so can cause false-alarm or undetected.Requiring harsh place to signal to noise ratio, existing relevant peaks detects and is difficult to meet the demands.
Summary of the invention
Technical problem to be solved by this invention is: for above-mentioned Problems existing, a kind of relevant peaks checkout gear and correlation peak detecting are provided, the dynamic range that relevant peaks detects can being improved, avoiding signal to cause false-alarm in the starting and ending moment because producing sudden change.
A kind of technical scheme that the present invention adopts is to provide a kind of relevant peaks checkout gear, comprising: delay buffer module, for carrying out the delay buffer of the scheduled time to the base-band data stream of input; Advanced threshold module, extracts described base-band data stream for the initial time in the described scheduled time from described delay buffer module, carries out moving average filter, obtain advanced bandpass threshold to described base-band data stream; Hysteresis threshold module, extracts described base-band data stream for the finish time in the described scheduled time from described delay buffer module, carries out moving average filter, obtain delayed bandpass threshold to described base-band data stream; Thresholding composite module, for combining described advanced bandpass threshold and described delayed bandpass threshold obtains decision threshold, wherein, described decision threshold threshold value is at any time the maximum of the threshold value of described advanced bandpass threshold and described delayed bandpass threshold; Matched filtering module, for extracting described base-band data stream from described delay buffer module during the scheduled time described in described base-band data stream delay buffer 1/3rd, and matched filtering is carried out to described base-band data stream, obtain the filter value of each data point of described base-band data stream; Cumulative cache module, filter value for the data point to described predetermined number successively adds up, obtain the accumulated value of described predetermined number, and the accumulated value of more adjacent twice, if all the other each accumulated values are all greater than previous accumulated value except last accumulated value in the accumulated value of described predetermined number, then export last accumulated value described; Relevant peaks detection module, for judging whether last accumulated value described exceeds described decision threshold, if exceed described decision threshold, is exported by the correlation of last accumulated value described as relevant peaks.
Wherein, the base band data of described input flows through the sampling of Quad Data Rate, and described predetermined number is four.
Wherein, described advanced threshold module comprises multiplier, multiple delayer, adder and subtracter, described base-band data stream inputs described multiplier, the output of described multiplier connects described multiple delayer and described adder, the output of described adder is connected described subtracter with the output of described multiple delayer, the output of described subtracter connect the input of described thresholding composite module and described adder,
Wherein, described hysteresis threshold module comprises multiplier, multiple delayer, adder and subtracter, described base-band data stream inputs described multiplier, the output of described multiplier connects described multiple delayer and described adder, the output of described adder is connected described subtracter with the output of described multiple delayer, and the output of described subtracter connects the input of described thresholding composite module and described adder.
Wherein, described relevant peaks checkout gear also comprises external interface module, and described external interface module for obtaining the correlation of described relevant peaks, and adjusts the described scheduled time according to the correlation of described relevant peaks.
Wherein, the described scheduled time is the multiple of 32 clock cycle.
The another kind of technical scheme that the present invention adopts is to provide a kind of correlation peak detecting, comprising: the delay buffer base-band data stream of input being carried out to the scheduled time; Extract described base-band data stream at the initial time of the described scheduled time, moving average filter is carried out to described base-band data stream, obtain advanced bandpass threshold; Extract described base-band data stream in the finish time of the described scheduled time, moving average filter is carried out to described base-band data stream, obtain delayed bandpass threshold; Combine described advanced bandpass threshold and described delayed bandpass threshold obtains decision threshold, wherein, described decision threshold threshold value is at any time the maximum of the threshold value of described advanced bandpass threshold and described delayed bandpass threshold; Extracting described base-band data stream during the scheduled time described in buffer memory 1/3rd, and matched filtering is carried out to described base-band data stream, obtain the filter value of each data point of described base-band data stream; The filter value of the data point of described predetermined number is successively added up, obtain the accumulated value of described predetermined number, and the accumulated value of more adjacent twice, if all the other each accumulated values are all greater than previous accumulated value except last accumulated value in the accumulated value of described predetermined number, then export last accumulated value described; Judge whether last accumulated value described exceeds described decision threshold, if exceed described decision threshold, is exported by the correlation of last accumulated value described as relevant peaks.
Wherein, the base band data of described input flows through the sampling of Quad Data Rate, and described predetermined number is four.
Wherein, described correlation peak detecting also comprises: the correlation obtaining described relevant peaks, and adjusts the described scheduled time according to the correlation of described relevant peaks.
Wherein, the described scheduled time is the multiple of 32 clock cycle.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows: by carrying out the delay buffer of the scheduled time to base-band data stream, extract base-band data stream in the starting and ending moment of the scheduled time and carry out the equal filtering of slip product, advanced bandpass threshold and delayed bandpass threshold can be obtained, combine two thresholdings and can obtain decision threshold, because decision threshold has widened scope relative to single thresholding, thus the dynamic range of relevant peaks detection can be improved, after dynamic range increases, the noise that signal occurred because producing sudden change in the starting and ending moment can be covered, thus avoid causing false-alarm or dew inspection, reliability and the accuracy of relevant peaks detection can be improved.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the structural representation of relevant peaks checkout gear one embodiment of the present invention.
Fig. 2 is the waveform schematic diagram that the cumulative cache module of relevant peaks checkout gear of the present invention exports.
Fig. 3 is the concrete logical construction schematic diagram of part of relevant peaks checkout gear of the present invention.
Fig. 4 is the emulation schematic diagram of signal level relevant peaks detection module under 10dBm.
Fig. 5 is the emulation schematic diagram of signal level relevant peaks detection module under-60dBm.
Fig. 6 is the schematic flow sheet of correlation peak detecting one embodiment of the present invention.
Embodiment
All features disclosed in this specification, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Arbitrary feature disclosed in this specification, unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
As shown in Figure 1, be the structural representation of relevant peaks checkout gear one embodiment of the present invention.Relevant peaks checkout gear comprises delay buffer module 11, advanced threshold module 12, hysteresis threshold module 13, thresholding combination sharpen 14, matched filtering module 15, cumulative cache module 16 and relevant peaks detection module 17.Alternatively, in the present embodiment, relevant peaks checkout gear also comprises external interface module 18., and certainly, relevant peaks checkout gear can also comprise other module.
Delay buffer module 11 is for carrying out the delay buffer of the scheduled time to the base-band data stream of input.Wherein, base-band data stream, can from being through analog-to-digital conversion or down-converted before the described delay buffer module 11 of input.Delay buffer module 11 pairs of base band input data are numbered and sort, and press pipeline mode output.Alternatively, the scheduled time is the multiple of 32 clock cycle.Clock cycle can be produced by the local crystal oscillator of relevant peaks checkout gear.
Advanced threshold module 12 extracts base-band data stream for the initial time in the scheduled time from delay buffer module 11, carries out moving average filter to base-band data stream, obtains advanced bandpass threshold.Wherein, export although base-band data stream is streamline, base-band data stream is not fixing, is vicissitudinous, and it is not straight line that the waveform forward-backward correlation of base-band data stream gets up, just near linear.And base-band data stream is changed from small to big at the initial time (namely generating the moment) of communication, the lasting moment remains unchanged substantially, finish time (namely declining the moment) from large to small, the line in these three moment is linked up just to form and is similar to trapezoidal shape, namely form a passband.After base band data flows through moving average filter, wavy curve can be made more level and smooth.
Hysteresis threshold module 13 extracts base-band data stream for the finish time in the scheduled time from delay buffer module 11, carries out moving average filter to base-band data stream, obtains delayed bandpass threshold.Wherein, delayed bandpass threshold and advanced bandpass threshold similar, be also be similar to trapezoidal shape, namely form a passband, but delayed bandpass threshold and advanced bandpass threshold in phase place before and after stagger.
Thresholding composite module 14 is for combining advanced bandpass threshold and delayed bandpass threshold obtains decision threshold, and wherein, decision threshold threshold value is at any time the maximum of the threshold value of advanced bandpass threshold and delayed bandpass threshold.Stagger before and after advanced bandpass threshold and delayed bandpass threshold are in phase place, the part that advanced bandpass threshold does not cover gets delayed bandpass threshold, and the part that delayed bandpass threshold does not cover gets advanced bandpass threshold, the part that advanced bandpass threshold and delayed bandpass threshold intersect gets the maximum of both threshold values.The coverage of decision threshold is the summation of advanced bandpass threshold and delayed bandpass threshold coverage, so can improve the dynamic range of relevant peaks detection.
Matched filtering module 15 for extracting base-band data stream from delay buffer module 11 when 1/3rd scheduled time of base-band data stream delay buffer, and carries out matched filtering to base-band data stream, obtains the filter value of each data point of base-band data stream.Wherein, filter value is correlation, is aforesaid (x (n-k) h (k)).
Cumulative cache module 16 successively adds up for the filter value of the data point to predetermined number, obtain the accumulated value of predetermined number, and the accumulated value of more adjacent twice, if all the other each accumulated values are all greater than previous accumulated value except last accumulated value in the accumulated value of predetermined number, then export last accumulated value.Wherein, accumulated value is correlation, is aforesaid y (n).In the present embodiment, the base band data of input flows through the sampling of Quad Data Rate, and predetermined number is four, so obtain four accumulated values at every turn.A period presents triangle trend wherein in the output of cumulative cache module 16, i.e. first monotonic increase, and the accumulated value illustrating in adjacent twice accumulated value below is all greater than accumulated value above, after accumulated value arrives maximum, then monotone decreasing.As shown in Figure 2, although arbitrary adjacent four accumulated values are all monotonic increases in accumulated value Y1 to Y5, there is not the trend reduced, so can not determine whether be maximum.When only choosing accumulated value Y3, Y4, Y5 and Y6, accumulated value Y3 to Y5 presents monotonic increase, and Y5 to Y6 once aobvious monotone decreasing, so export accumulated value Y6.
The correlation of last accumulated value as relevant peaks, for judging whether last accumulated value exceeds decision threshold, if exceed decision threshold, exports by relevant peaks detection module 17.Wherein, accumulated value exceeds decision threshold, shows to capture useful signal.
Alternatively, external interface module 18 for obtaining the correlation of relevant peaks, and adjusts the scheduled time according to the correlation of relevant peaks.In actual applications, common are 32,64, the spread spectrum of the n power power figure place of 128 grades 2.For the spread spectrum of not isotopic number, external interface module 18 can adjust the size of the scheduled time, namely adjusting the scheduled time is 32 clock cycle, 64 clock cycle or 128 clock cycle, the clock cycle of even larger multiple, thus can autgmentability be strengthened, facilitate the application of different spread spectrum figure place.External interface module 18 can adjust by control FPGA (Field-ProgrammableGateArray, field programmable gate array).
Referring to Fig. 3, is the concrete logical construction schematic diagram of part of relevant peaks checkout gear of the present invention.
Delay buffer module 11 comprises multiple delayer 111, a clock cycle of each delayer 111 time delay.Advanced threshold module 12 comprises multiplier 121, multiple delayer 122, adder 123 and subtracter 124.Hysteresis threshold module 13 comprises multiplier 131, multiple delayer 132, adder 133 and subtracter 134.
Base-band data stream input delay cache module 11 first delayers 111 of input, then input to multiplier 121.Then base-band data stream is transmitted successively between multiple delayer 111.In the end a delayer 111 exports base-band data stream, and inputs to multiplier 131.Wherein, if the quantity of delayer 111 is N number of, so at N/3 delayer 111, output base band data is flow to matched filter 15.
The output of multiplier 121 connects multiple delayer 122 and adder 123, and the output of adder 123 is connected subtracter 124 with the output of multiple delayer 122, and the output of subtracter 123 connects the input of thresholding composite module 14 and adder 123.Wherein, from the principle of spread spectrum communication, be the same frequency, the homophase that are difficult to accomplish carrier wave in practical communication, the optimal way eliminating carrier wave impact asks energy to signal.Each data point of advanced threshold module 12 pairs of base-band data stream of the present embodiment directly asks energy at (comprising noise and useful signal), but, consider that the energy value of individual data point changes greatly, antijamming capability is more weak, therefore, the present embodiment takes multiple spot energy estimators, and each moment intercepts n continuous, adjacent energy point, and uses pipeline organization cyclic shift.Be expressed as follows:
ACCD＝ACCD+E
2-data[n]
E
2＝I
2+Q
2
Wherein, ACCD represents cycle accumulor value, E
2be the energy value estimated value of signal current time, I and Q is orthogonal two paths of signals, and data [n] is the circulating register be made up of multiple delayer 122, E
2first flow to from data [1], finally flow out from data [n].So at E
2before not having arrival n-th delayer 111, the value of data [n] is zero.At E
2after the n-th delayer 111 exports, headed by data [n], be introduced into the E of first delayer 111
2.Thresholding is very level and smooth, and adaptive ability is strong, under high and low level, can well distinguish correlation and noise level.The advanced bandpass threshold that this advanced threshold module 12 obtains is very level and smooth, and adaptive ability is strong, under high and low level, can well distinguish correlation and noise level.Further, advanced threshold module 12 is only by a multiplier 121, and multiple register 122, adder 123 and a subtracter 124 are formed, and simple for structure, consumption of natural resource is little.
The output of multiplier 131 connects multiple delayer 132 and adder 133, and the output of adder 133 is connected subtracter 134 with the output of multiple delayer 132, and the output of subtracter 133 connects the input of thresholding composite module 14 and adder 133.Hysteresis threshold module 13 is identical with the logical construction of advanced threshold module 12, and the mode forming thresholding is also identical.Its difference is only, delayer 122 can be different from the quantity of delayer 132, and its result is exactly that advanced bandpass threshold is different with the level of delayed bandpass threshold, but amplitude can be identical.
As shown in Figure 4 and Figure 5, be the application example of relevant peaks checkout gear, this application example is the emulation of signal level relevant peaks detection module under 10dBm and under-60dBm.This application example adopts the system actual signal of xilinx logic analysis software ChipScope sampling.IF signal levels is 10dBm.In Fig. 4, advanced bandpass threshold A1 and delayed bandpass threshold B1 is public constitutes decision threshold, decision threshold on the left side covers noise range, cover noise range on the right, these two noise ranges are owing to being positioned at initial time and the finish time of signal, and signal can produce sudden change or hangover, produces noise, and decision threshold can cover these noises, avoid false-alarm or undetected.In figure, the threshold value of decision threshold is very level and smooth, except correct correlation (i.e. the accumulated value of cumulative cache module output) is beyond except thresholding, do not have secondary lobe to exceed thresholding, relevant maximum and threshold value difference have the arithemetic unit of 20 about ten million.In this simulation result, advanced bandpass threshold A1 is not identical with the level value of delayed bandpass threshold B1, is because the quantity of the delayer of advanced threshold module is greater than the quantity of the delayer of hysteresis threshold module.
In Fig. 5, advanced bandpass threshold A2 and delayed bandpass threshold B2 is public constitutes decision threshold, decision threshold on the left side covers noise range, cover noise range on the right, these two noise ranges are owing to being positioned at initial time and the finish time of signal, and signal can produce sudden change or hangover, produces noise, and decision threshold can cover these noises, avoid false-alarm or undetected.In figure decision threshold threshold value due to signal very weak, noise is smaller, so be not very level and smooth, certain " ripple " is had to occur, but relevant maximum and threshold value difference still have the arithemetic unit of about 50,000, except correct correlation (i.e. the accumulated value of cumulative cache module output), beyond except thresholding, does not have secondary lobe to exceed thresholding.In this simulation result, advanced bandpass threshold A2 is not identical with the level value of delayed bandpass threshold B2, is because the quantity of the delayer of advanced threshold module is greater than the quantity of the delayer of hysteresis threshold module.
The relevant peaks checkout gear of the embodiment of the present invention improves the dynamic range of relevant peaks detection, signal is avoided to cause false-alarm in the starting and ending moment because producing sudden change, catching burst spread-spectrum signal can be completed well, range up to the linear dynamic range of 70dB, effectively restraint speckle, improve the dynamic range of signal decoding, there is self adaptation, be specially adapted to the digital correlator design of burst communication, and core circuit programming realization on monolithic FPGA, use flexibly, autgmentability is strong.
Referring to Fig. 6, is the schematic flow sheet of correlation peak detecting one embodiment of the present invention.Correlation peak detecting comprises:
S11: the delay buffer base-band data stream of input being carried out to the scheduled time.
Wherein, base-band data stream before the input, can from being through analog-to-digital conversion or down-converted.When carrying out delay buffer, base band input data be numbered and sorted, and pressing pipeline mode output.Alternatively, the scheduled time is the multiple of 32 clock cycle.Clock cycle can be produced by the local crystal oscillator of relevant peaks checkout gear.
S12: extract base-band data stream at the initial time of the scheduled time, moving average filter is carried out to base-band data stream, obtains advanced bandpass threshold.
Wherein, export although base-band data stream is streamline, base-band data stream is not fixing, is vicissitudinous, and it is not straight line that the waveform forward-backward correlation of base-band data stream gets up, just near linear.And base-band data stream is changed from small to big at the initial time (namely generating the moment) of communication, the lasting moment remains unchanged substantially, finish time (namely declining the moment) from large to small, the line in these three moment is linked up just to form and is similar to trapezoidal shape, namely form a passband.After base band data flows through moving average filter, wavy curve can be made more level and smooth.
S13: extract base-band data stream in the finish time of the scheduled time, moving average filter is carried out to base-band data stream, obtains delayed bandpass threshold.
Wherein, delayed bandpass threshold and advanced bandpass threshold similar, be also be similar to trapezoidal shape, namely form a passband, but delayed bandpass threshold and advanced bandpass threshold in phase place before and after stagger.
S14: combine advanced bandpass threshold and delayed bandpass threshold obtains decision threshold, wherein, decision threshold threshold value is at any time the maximum of the threshold value of advanced bandpass threshold and delayed bandpass threshold.
Wherein, decision threshold threshold value is at any time the maximum of the threshold value of advanced bandpass threshold and delayed bandpass threshold.Stagger before and after advanced bandpass threshold and delayed bandpass threshold are in phase place, the part that advanced bandpass threshold does not cover gets delayed bandpass threshold, and the part that delayed bandpass threshold does not cover gets advanced bandpass threshold, the part that advanced bandpass threshold and delayed bandpass threshold intersect gets the maximum of both threshold values.The coverage of decision threshold is the summation of advanced bandpass threshold and delayed bandpass threshold coverage, so can improve the dynamic range of relevant peaks detection.
S15: extract described base-band data stream when 1/3rd scheduled time of buffer memory, and matched filtering is carried out to base-band data stream, obtain the filter value of each data point of base-band data stream.
Wherein, filter value is correlation, is aforesaid (x (n-k) h (k)).
S16: the filter value of the data point of predetermined number is successively added up, obtain the accumulated value of predetermined number, and the accumulated value of more adjacent twice, if all the other each accumulated values are all greater than previous accumulated value except last accumulated value in the accumulated value of predetermined number, then export last accumulated value.
Wherein, accumulated value is correlation, is aforesaid y (n).In the present embodiment, the base band data of input flows through the sampling of Quad Data Rate, and predetermined number is four, so obtain four accumulated values at every turn.A period presents triangle trend wherein in the output of cumulative cache module 16, i.e. first monotonic increase, and the accumulated value illustrating in adjacent twice accumulated value below is all greater than accumulated value above, after accumulated value arrives maximum, then monotone decreasing.
S17: judge whether last accumulated value exceeds decision threshold, if exceed decision threshold, exports the correlation of last accumulated value as relevant peaks.
Alternatively, correlation peak detecting also comprises: the correlation obtaining relevant peaks, and adjusts the scheduled time according to the correlation of relevant peaks.Wherein, in actual applications, common are 32,64, the spread spectrum of the n power power figure place of 128 grades 2.For the spread spectrum of not isotopic number, can adjust the size of the scheduled time, namely adjusting the scheduled time is 32 clock cycle, 64 clock cycle or 128 clock cycle, the clock cycle of even larger multiple, thus can autgmentability be strengthened, facilitate the application of different spread spectrum figure place.
Adopt the correlation peak detecting of the embodiment of the present invention to have the technique effect same with the relevant peaks checkout gear of previous embodiment, repeat no more herein.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (10)
1. a relevant peaks checkout gear, is characterized in that, comprising:
Delay buffer module, for carrying out the delay buffer of the scheduled time to the base-band data stream of input;
Advanced threshold module, extracts described base-band data stream for the initial time in the described scheduled time from described delay buffer module, carries out moving average filter, obtain advanced bandpass threshold to described base-band data stream;
Hysteresis threshold module, extracts described base-band data stream for the finish time in the described scheduled time from described delay buffer module, carries out moving average filter, obtain delayed bandpass threshold to described base-band data stream;
Thresholding composite module, for combining described advanced bandpass threshold and described delayed bandpass threshold obtains decision threshold, wherein, described decision threshold threshold value is at any time the maximum of the threshold value of described advanced bandpass threshold and described delayed bandpass threshold;
Matched filtering module, for extracting described base-band data stream from described delay buffer module during the scheduled time described in described base-band data stream delay buffer 1/3rd, and matched filtering is carried out to described base-band data stream, obtain the filter value of each data point of described base-band data stream;
Cumulative cache module, filter value for the data point to predetermined number successively adds up, obtain the accumulated value of described predetermined number, and the accumulated value of more adjacent twice, if all the other each accumulated values are all greater than previous accumulated value except last accumulated value in the accumulated value of described predetermined number, then export last accumulated value described;
Relevant peaks detection module, for judging whether last accumulated value described exceeds described decision threshold, if exceed described decision threshold, is exported by the correlation of last accumulated value described as relevant peaks.
2. relevant peaks checkout gear according to claim 1, is characterized in that, the base band data of described input flows through the sampling of Quad Data Rate, and described predetermined number is four.
3. relevant peaks checkout gear according to claim 1 and 2, it is characterized in that, described advanced threshold module comprises multiplier, multiple delayer, adder and subtracter, described base-band data stream inputs described multiplier, the output of described multiplier connects described multiple delayer and described adder, the output of described adder is connected described subtracter with the output of described multiple delayer, and the output of described subtracter connects the input of described thresholding composite module and described adder.
4. relevant peaks checkout gear according to claim 1 and 2, it is characterized in that, described hysteresis threshold module comprises multiplier, multiple delayer, adder and subtracter, described base-band data stream inputs described multiplier, the output of described multiplier connects described multiple delayer and described adder, the output of described adder is connected described subtracter with the output of described multiple delayer, and the output of described subtracter connects the input of described thresholding composite module and described adder.
5. relevant peaks checkout gear according to claim 1, it is characterized in that, described relevant peaks checkout gear also comprises external interface module, and described external interface module for obtaining the correlation of described relevant peaks, and adjusts the described scheduled time according to the correlation of described relevant peaks.
6. relevant peaks checkout gear according to claim 1 or 5, is characterized in that, the described scheduled time is the multiple of 32 clock cycle.
7. a correlation peak detecting, is characterized in that, comprising:
The base-band data stream of input is carried out to the delay buffer of the scheduled time;
Extract described base-band data stream at the initial time of the described scheduled time, moving average filter is carried out to described base-band data stream, obtain advanced bandpass threshold;
Extract described base-band data stream in the finish time of the described scheduled time, moving average filter is carried out to described base-band data stream, obtain delayed bandpass threshold;
Combine described advanced bandpass threshold and described delayed bandpass threshold obtains decision threshold, wherein, described decision threshold threshold value is at any time the maximum of the threshold value of described advanced bandpass threshold and described delayed bandpass threshold;
Extracting described base-band data stream during the scheduled time described in buffer memory 1/3rd, and matched filtering is carried out to described base-band data stream, obtain the filter value of each data point of described base-band data stream;
The filter value of the data point of predetermined number is successively added up, obtain the accumulated value of described predetermined number, and the accumulated value of more adjacent twice, if all the other each accumulated values are all greater than previous accumulated value except last accumulated value in the accumulated value of described predetermined number, then export last accumulated value described;
Judge whether last accumulated value described exceeds described decision threshold, if exceed described decision threshold, is exported by the correlation of last accumulated value described as relevant peaks.
8. correlation peak detecting according to claim 7, is characterized in that, the base band data of described input flows through the sampling of Quad Data Rate, and described predetermined number is four.
9. correlation peak detecting according to claim 7, is characterized in that, described correlation peak detecting also comprises:
Obtain the correlation of described relevant peaks, and according to the correlation of described relevant peaks, the described scheduled time is adjusted.
10. the correlation peak detecting according to claim 7 or 9, is characterized in that, the described scheduled time is the multiple of 32 clock cycle.
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