CN107979550A - The echo detection circuit and method of multicarrier system - Google Patents
The echo detection circuit and method of multicarrier system Download PDFInfo
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- CN107979550A CN107979550A CN201610938601.6A CN201610938601A CN107979550A CN 107979550 A CN107979550 A CN 107979550A CN 201610938601 A CN201610938601 A CN 201610938601A CN 107979550 A CN107979550 A CN 107979550A
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- 238000001514 detection method Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title description 10
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- 239000000872 buffer Substances 0.000 claims abstract description 43
- 238000005096 rolling process Methods 0.000 claims description 9
- 241000208340 Araliaceae Species 0.000 claims description 5
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims description 5
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- RHGKLRLOHDJJDR-BYPYZUCNSA-N L-citrulline Chemical compound NC(=O)NCCC[C@H]([NH3+])C([O-])=O RHGKLRLOHDJJDR-BYPYZUCNSA-N 0.000 description 19
- 238000010586 diagram Methods 0.000 description 16
- 230000005611 electricity Effects 0.000 description 4
- 230000002123 temporal effect Effects 0.000 description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0212—Channel estimation of impulse response
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/024—Channel estimation channel estimation algorithms
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Abstract
A kind of echo detection circuit for being applied to a multicarrier system, comprising：One buffer, for storing multiple channel impulse response values of the multicarrier system, those channel impulse response values include a destination channel impulse response value, multiple preceding channel impulse response values and multiple rear channel impulse response values；One critical value generation circuit, couples the buffer, for producing the critical value corresponding to the destination channel impulse response value according to those preceding channel impulse response values and those rear channel impulse response values；And an echo decision circuitry, the critical value generation circuit and the buffer are coupled, for comparing the destination channel impulse response value with the critical value to judge whether the destination channel impulse response value corresponds to an echo path of the multicarrier system.
Description
Technical field
The present invention is on echo detection circuit and method, especially with respect to the echo detection circuit of multicarrier system and side
Method.
Background technology
Echo (echo) is the problem of multicarrier (multi-carrier) system can often be run into.If data solution to be improved
The accuracy of code, then must correctly estimate position and the channel length (channel length) of echo.Known way
It is to compare the size of channel impulse response and fixed critical value, when the size of channel impulse response is more than critical value, then
Assert the position i.e. position of echo of the channel impulse response.However, fixed critical value be easy to cause erroneous judgement, such as partially
High critical value causes the less echo of channel impulse response to be ignored, and relatively low critical value causes noise to be mistaken for echo
Channel impulse response, therefore cause the data error rate of the receiving terminal of multicarrier system to rise.In addition, if a channel will be included
Multiple channel pulses in the particular range of impulse response index ring the corresponding channel pulse sound value of index and are averaged conduct
Critical value, be also possible to because specific channel impulse response value is excessive and make the critical value of the particular range higher and produce before
State erroneous judgement problem.
The content of the invention
In view of the deficiency of prior art, a purpose of the invention is the echo detection circuit for providing a kind of multicarrier system
And method, to detect echo exactly and improve circuit performance.
The invention discloses a kind of echo detection circuit for being applied to a multicarrier system, comprising：One buffer, for storing
Multiple channel impulse response values of the multicarrier system, those channel impulse response values include a destination channel impulse response value,
Multiple preceding channel impulse response values and multiple rear channel impulse response values；One critical value generation circuit, couples the buffer, uses
To produce according to those preceding channel impulse response values and those rear channel impulse response values and correspond to the destination channel impulse response
One critical value of value；And an echo decision circuitry, the critical value generation circuit and the buffer are coupled, for comparing the target
Channel impulse response value is with the critical value to judge whether the destination channel impulse response value corresponds to one time of the multicarrier system
Sound path.
The present invention separately discloses a kind of echo detection method for being applied to a multicarrier system, comprising：Store the overloading wave system
Multiple channel impulse response values of system, those channel impulse response values include a destination channel impulse response value, multiple preceding channels
Impulse response value and multiple rear channel impulse response values；Rung according to those preceding channel impulse response values and those rear channel pulses
The critical value produced corresponding to the destination channel impulse response value should be worth；And compare the destination channel impulse response value with being somebody's turn to do
Critical value is to judge whether the destination channel impulse response value corresponds to an echo path of the multicarrier system.
The present invention multicarrier system echo detection circuit and the method property of can adapt to according to current channel pulse
Response adjusts critical value.Compared to conventional art, the echo detection circuit and method of multicarrier system of the invention have more
Elasticity, can more accurately judge echo.
Feature, implementation and effect for the present invention, hereby coordinate schema to make embodiment detailed description as follows.
Brief description of the drawings
Fig. 1 is the partial block diagram of multicarrier system of the present invention；
Fig. 2 is the block diagram of an embodiment of the echo detection circuit of multicarrier system of the present invention；
Fig. 3 is the flow chart of an embodiment of the echo detection method of the multicarrier system of corresponding diagram 2；
Fig. 4 is the block diagram of an embodiment of critical value generation circuit of the present invention；
Fig. 5 be the present invention multicarrier system echo detection method in step S320 an embodiment thin portion flow
Figure；
Fig. 6 is channel impulse response value and the relation schematic diagram of channel impulse response index；
Fig. 7 is the block diagram of another embodiment of critical value generation circuit of the present invention；
Fig. 8 be the present invention multicarrier system echo detection method in step S320 another embodiment thin portion flow
Figure；
Fig. 9 is another channel impulse response value and the relation schematic diagram of channel impulse response index；
Figure 10 is the block diagram of an embodiment of echo decision circuitry of the present invention；And
Figure 11 be the present invention multicarrier system echo detection method in step S330 an embodiment thin portion flow
Figure.
Symbol description
1 fast Fourier transform circuit
2 channel frequency response counting circuits
3 temporal interpolation circuits
4 Frequency domain interpolation circuits
5 against fast Fourier transform circuit
6 echo detection circuits
10 buffers
20 critical value generation circuits
30 echo decision circuitries
210 counting circuits
220th, 230 filter circuit
240 detection circuits
250th, 280,1020 decision-making circuit
260th, 270 selection circuit
620th, 630 filter window
910th, 920 critical value
930th, 940 channel impulse response value
1010th, 1040 buffer
1030 counters
1050 decision circuitries
S310~S330, S510~S560, S810~S880, S1110~S1170 steps
Embodiment
The disclosure of the present invention includes the echo detection circuit and method of multicarrier system.It is being embodied as possible premise
Under, it is real that the art tool usually intellectual can select equivalent element or step according to the disclosure of this specification
The existing present invention, that is, the implementation of the present invention be not limited to after the embodiment chatted.
Present invention can apply to various multicarrier systems, such as based on orthogonal frequency division multiplexing (orthogonal
Frequency-division multiplexing, OFDM) multicarrier system.Overloading wave system based on orthogonal frequency division multiplexing
It can be the television system (Digital Video Broadcasting-Terrestrial) of radiovision digital broadcasting to unite, example
Such as the television system of DVB-T2, DVB-C2, DTMB and ISDBT equal-specification.Led to solve prior art using fixed critical value
The problem of cause, when whether judge a particular channel impulse response is an echo, the present invention is with reference to the particular channel arteries and veins
Response and multiple channel impulse responses before and after it are rushed dynamically to determine critical value, effectively prevent lacking for fixed critical value
Point.
The partial block diagram of Fig. 1 systems multicarrier system of the present invention.Fast Fourier Transform (fast Fourier
Transform, FFT) circuit 1 changes input signal to frequency domain.Channel frequency response (channel frequency
Response) counting circuit 2 goes out specific pilot signal (such as spuious pilot signal (scattered pilot)) in frequency-domain calculations
Channel frequency response.Channel frequency response of the temporal interpolation circuit 3 according to pilot signal, pilot signal is calculated in temporal interpolation
Between several orthogonal frequency division multiplexing symbols channel frequency response.Channel frequency of the Frequency domain interpolation circuit 4 according to pilot signal
Response, the channel frequency response of several subcarriers between pilot signal is calculated in Frequency domain interpolation.Frequency domain interpolation circuit 4 is operating
When must be known by channel length (channel length) and the echo position of multicarrier system.Inverse fast Fourier transform circuit
Channel frequency response is converted to channel impulse response by 5.Echo detection circuit 6 is in tim e- domain detection channel impulse response (channel
Impulse response) obtain foregoing channel length and echo position.
The block diagram of one embodiment of the echo detection circuit 6 of Fig. 2 systems multicarrier system of the present invention.Fig. 3 is corresponding diagram 2
The flow chart of one embodiment of the echo detection method of multicarrier system.The present invention echo detection circuit 6 include buffer 10,
Critical value generation circuit 20 and echo decision circuitry 30.Buffer 10 stores multiple channel impulse response values of multicarrier system
CIR, those channel impulse response values include a destination channel impulse response value CIR [k], are multiple positioned at destination channel pulse sound
Preceding channel impulse response value and multiple rear channel pulse sound being located at after the destination channel impulse response value before should being worth
It should be worth (step S310).Because the index (index) of inverse Fast Fourier Transform has periodically, the size of buffer 10
Can be designed as just storing enough an inverse fast fourier transform windows size N (assuming that N is positive integer, and 0≤k≤
N-1), but it is not limited.Critical value generation circuit 20 produces critical value according to channel impulse response value, more particularly, faces
Dividing value generation circuit 20 is produced to correspond to and is somebody's turn to do depending at least on those preceding channel impulse response values and those rear channel impulse response values
A critical value (step S320) of destination channel impulse response value CIR [k].Echo decision circuitry 30 compares the destination channel pulse
Response CIR [k] is with the critical value to judge whether destination channel impulse response value CIR [k] corresponds to the multicarrier system
One echo path (step S330).
Fig. 4 is the functional block diagram of an embodiment of critical value generation circuit 20 of the present invention.Fig. 5 is the multicarrier of the present invention
The thin portion flow chart of an embodiment of the step S320 of the echo detection method of system.Critical value generation circuit 20, which includes, calculates electricity
Road 210, filter circuit 220, filter circuit 230, detection circuit 240 and decision-making circuit 250.The master of critical value generation circuit 20
Syllabus is to produce a critical value related with destination channel impulse response value CIR [k], this purpose can be filtered by utilizing
The preceding L channel impulse response value of 220 filtered target channel impulse response value CIR [k] of wave circuit, and by utilizing filter circuit
The rear L channel impulse response value of 230 filtered target channel impulse response value CIR [k] is reached.L is filter circuit 220,230
Filter window size.
In one embodiment, maximum of the counting circuit 210 in N number of channel impulse response value CIR, to produce
First reference value (step S510).Such as first reference value be equal to R times (0 of maximum channel impulse response value<R<1).Filtered electrical
Road 220,230 can be rolling average (moving average) counting circuit, and each rolling average counting circuit includes at least
The buffer cell of L-1 channel impulse response value can be stored.Also referring to Fig. 6, it is channel impulse response value and channel arteries and veins
The relation schematic diagram of punching response index.The preceding L channel pulse of 220 filtered target channel impulse response value CIR [k] of filter circuit
Response (is located in filter window 620), and the rear L letter of 230 filtered target channel impulse response value CIR [k] of filter circuit
Road impulse response value (is located in filter window 630).If realizing filter function with rolling average counting circuit, when echo judges
When circuit 30 is intended to comparison object channel impulse response value CIR [k] with critical value, the input of filter circuit 220 and filter circuit 230
Respectively+L channel impulse response values of kth -1 and kth, and filter circuit 220 and filter circuit 230 are respectively according to L letter
The second reference value of average generation and the 3rd reference value (step S520, S530) of road impulse response value sum total.
Detection circuit 240 is write from memory according to whether a count value (being produced by a counter, counter is not shown) is more than or equal to one
Value is recognized to judge whether the output of filter circuit 220 and filter circuit 230 stablizes.In detail, when destination channel impulse response value
The index k of CIR [k] is less than L, and the buffer cell in filter circuit 220 and filter circuit 230 not yet fills up channel impulse response
Value, second and third reference value can not still react the situation of multicarrier system at this time, if decision-making circuit 250 is at this time according to second
And the 3rd reference value determine critical value, it is likely that too small critical value can be obtained, thus cause system erroneous judgement.
Therefore, before count value does not reach default value, detection circuit 240 judges filter circuit 220 and filter circuit 230
Output not yet stablizes (step S540 is judged as NO, and detection circuit 240 does not produce indication signal), and decision-making circuit 250 is according to first
Reference value produces critical value (step S550), such as is directly used as critical value using the first reference value.When destination channel impulse response
The index k of value is equal to L, and the second reference value is that filter circuit 220 indexes channel impulse response in L letter for being 0~(k-1) at this time
Road impulse response value does that filtering calculates as a result, and the 3rd reference value is that filter circuit 230 is to channel impulse response index
(k+1) the L channel impulse response value of~(k+L) does the result that filtering calculates.Detection circuit 240 judges filter circuit at this time
220 and 230 output stablizes (step S540 is judged as YES, detection circuit 240 produce indication signal), decision-making circuit 250 according to
Come to produce critical value (step S560) according to first, second and third reference value according to indication signal, such as decision-making circuit 250 is from the
One reference value, be minimized as critical value in β times of α times of the second reference value and the 3rd reference value.(α, β ＞ 1, α and β can
To be identical or different).
Fig. 7 is the block diagram of another embodiment of critical value generation circuit 20 of the present invention.Fig. 8 is the overloading wave system of the present invention
The thin portion flow chart of another embodiment of the step S320 of the echo detection method of system.Critical value generation circuit 20, which includes, calculates electricity
Road 210, filter circuit 220, filter circuit 230, detection circuit 240, selection circuit 260, selection circuit 270 and decision-making circuit
280.It is identical that the present embodiment and the embodiment of Fig. 4 have the function of that the circuit of similar elements symbol has, and so it will not be repeated.This reality
The difference for applying example and the embodiment of Fig. 4 is that in the present embodiment, filter circuit 220 and filter circuit 230 filter selection respectively
The output of circuit 260 and selection circuit 270, and indirect channel impulse response value CIR is filtered.In detail, electricity is calculated
Road 210 is after the first reference value (step S810) is produced, and selection circuit 260 is respectively by destination channel impulse response value CIR [k]
Preceding L channel impulse response value CIR [k-1]~CIR [k-L] compared with the first reference value, and export among L first
Value, wherein those the first median systems are respectively L channel impulse response value CIR [the k-1]~CIR [k-L] and first ginseng
Examine the smaller (step S820) of value.Filter circuit 220 is filtered those first medians afterwards, to produce one second ginseng
Examine value (step S830).Similarly, selection circuit 270 rings the rear L channel pulse of destination channel impulse response value CIR [k]
Should value CIR [k+1]~CIR [k+L] compared with the first reference value, and export L the second medians, wherein those are among second
Value system is respectively L channel impulse response value CIR [the k+1]~CIR [k+L] and smaller's (step of first reference value
S840).Filter circuit 230 is filtered those second medians afterwards, to produce one the 3rd reference value (step S850).
Before count value does not reach default value, detection circuit 240 judges the output of filter circuit 220 and filter circuit 230
Not yet stablize (step S860 is judged as NO, and detection circuit 240 does not produce indication signal), decision-making circuit 280 is according to the first reference
Value produces critical value (step S870), then repeats step S820~S870, until count value is more than or equal to default value, this
When detection circuit 240 judge that the output of filter circuit 220 and filter circuit 230 stablizes that (step S860 is judged as YES, detection electricity
Road 240 produces indication signal), decision-making circuit 280 comes to produce critical value (step according to second and third reference value according to indication signal
Rapid S880), such as decision-making circuit 280 takes smaller value as critical from β times of α times of the second reference value and the 3rd reference value
Value.(α, β ＞ 1, α and β can be identical or different).Next step S820~S880 is repeated.
This since filter circuit 220,230 is rolling average counting circuit, works as spectral window in the fig. 4 embodiment
In mouthful a few channels impulse response value CIR is excessive or filter window in more than the first reference value channel impulse response value CIR
When excessive, follow-up channel impulse response value may be caused to become hour, the output of filter circuit 220 and filter circuit 230 can not
Cause to judge by accident therewith diminishing in time.Opposite, it is pre- using selection circuit 260 and selection circuit 270 in the embodiment of Fig. 7
First make choice so that the numerical value for entering filter circuit 220 and filter circuit 230 to be limited to be less than or equal to the first reference value, you can
To avoid earlier figures 4 embodiment the shortcomings that.For example, Fig. 9 shows another channel impulse response value and channel impulse response
The relation schematic diagram of index.Critical value 910 (straight-line segment) is definite value (such as equal to first reference value), 920 (channel of critical value
The curved segments of 930 both sides of impulse response value) for the smaller value in β times of α times of the second reference value and the 3rd reference value.If
Not filtered with selection circuit 260 and selection circuit 270, then critical value 920 will be drawn high by channel impulse response value 930,
It may cause channel impulse response value 940 system is takeed for channel impulse response value 940 non-right not less than critical value 920
Answer an echo path.Furthermore it also can be seen that the situation generation that will also result in erroneous judgement using fixed critical value 910 is (critical by Fig. 9
It is worth higher and misses channel impulse response value 940).
Figure 10 is the block diagram of an embodiment of echo decision circuitry 30 of the present invention.Figure 11 is the multicarrier system of the present invention
Echo detection method step S330 an embodiment thin portion flow chart.Echo decision circuitry 30 include buffer 1010,
Decision-making circuit 1020, counter 1030, buffer 1040 and decision circuitry 1050.Buffer 1010 is used for storing candidate channel
Impulse response value (being initially 0) and its corresponding channel impulse response index.1020 comparison object channel pulse of decision-making circuit is rung
Should value CIR [k] and critical value and candidate channel impulse response value (step S1110).If current destination channel impulse response
Value CIR [k] is more than critical value, represents that destination channel impulse response value CIR [k] may correspond to an echo of the multicarrier system
Path, if destination channel impulse response value CIR [k] is also more than the candidate channel impulse response value, decision-making circuit 1020 at this time
By destination channel impulse response value CIR [k] as a candidate channel impulse response value, and by the candidate channel impulse response value
(CIR [k]) and its channel impulse response index (k) storage reset counter 1030 to buffer 1010 (step S1120)
(step S1130).
Then, decision-making circuit 1020 continue more next destination channel impulse response value CIR [k+1], the critical value and
Candidate channel impulse response value CIR [k] (returning to step S1110).In detail, the purpose of echo decision circuitry 30 is to compare
The candidate channel impulse response value stored at present in buffer 1010 and its front and rear each a channel impulse response value of M (M >=1), such as
The current candidate channel impulse response value of fruit is rung for continuous a channel pulse of 2M+1 (i.e. the comparison section of decision-making circuit 1020)
The maximum in should being worth, then the decision of the decision-making circuit 1020 candidate channel impulse response value is the echo channel of corresponding echo path
Impulse response value, and by the echo channel impulse response value and its channel impulse response index storage into buffer 1040, instead
It, then determine that the candidate channel impulse response value does not correspond to echo path.1020 system of decision-making circuit is according to the meter of counter 1030
Numerical value judges the comparison section whether processing is over.
In detail, (it can determine that the candidate channel impulse response value compared with its preceding M at this time when step S1110 is judged as YES
A channel impulse response value is big), 1020 control counter 1030 of decision-making circuit counts again.Afterwards when counter 1030 is continuously counted
(imply that and circulated in step S1110 and step S1140, until step S1140 is judged as YES) when counting to M, meaned continuous N
Channel impulse response value is less than one of the critical value and the candidate channel impulse response value, and counter 1030 produces a control
Signal notifies decision-making circuit 1020.Decision-making circuit 1020 can determine the candidate channel impulse response according to the control signal at this time
Value is big compared with M channel impulse response value thereafter, and it is echo channel impulse response value that can determine the candidate channel impulse response value
(step S1150), reset counter 1030 (step S1160) and remove buffer 1010 (step S1170).
Above-mentioned step is persistently carried out, multiple echo channel impulse response values and its correspondence are stored in last buffer 1040
Channel impulse response index, decision circuitry 1050 can calculate the multicarrier system according to the storage content of buffer 1040
Respond number and a channel length.
It is worth noting that, decision-making circuit 1020 judges whether destination channel impulse response value CIR [k] is candidate channel arteries and veins
Response is rushed, and judges whether candidate channel impulse response value is that echo channel impulse response value is parallel or synchronization process, also
I.e. after echo decision circuitry 30 has inspected all N number of channel impulse response values, you can determine that multiple echo channel pulses are rung
It should be worth, and need not first find out all candidate channel impulse response values, then confirm that from those candidate channel impulse response values
A little is echo channel impulse response value.The efficiency of circuit can so be increased.
In conclusion when whether judge a particular channel impulse response is an echo, employed relative to prior art
Fixed critical value, multiple channel impulse responses of the present invention with reference to the particular channel impulse response and before and after it
Dynamically to determine critical value.It is in addition, more before and after the particular channel impulse response when being calculated using rolling average counting circuit
When the rolling average of a channel impulse response is to produce critical value, it is possible to because of the influence of some channel impulse response value maximum
And critical value is driven high, therefore the present invention more selects filter circuit 220 and filter using selection circuit 260 and selection circuit 270
The input value of wave circuit 230, avoids maximum from being included into rolling average calculating, and then improves foregoing deficiency.
Due to the art, tool usually intellectual can be in the exposure by the device inventions of Fig. 2, Fig. 4, Fig. 7, Figure 10
Hold to understand implementation detail and the change of Fig. 3, Fig. 5, Fig. 8, Figure 11 method invention, thus while the embodiment of the present invention as above institute
State, but those embodiments are not used for limiting the present invention, the art tool usually intellectual can be according to the bright of the present invention
The content shown or implied imposes change to the technical characteristic of the present invention, all this kind change may belong to sought by the present invention
Patent protection category, in other words, scope of patent protection of the invention must be regarded subject to the as defined in claim of this specification.
Claims (20)
1. a kind of echo detection circuit for being applied to a multicarrier system, comprising：
One buffer, for storing multiple channel impulse response values of the multicarrier system, those channel impulse response values include
One destination channel impulse response value, multiple preceding channel impulse response values and multiple rear channel impulse response values；
One critical value generation circuit, couples the buffer, for according to those preceding channel impulse response values and those rear channel arteries and veins
Rush response and produce the critical value for corresponding to the destination channel impulse response value；And
One echo decision circuitry, couples the critical value generation circuit and the buffer, for comparing the destination channel impulse response
Value is with the critical value to judge whether the destination channel impulse response value corresponds to an echo path of the multicarrier system.
2. echo detection circuit as claimed in claim 1, it is characterised in that the critical value generation circuit includes：
One counting circuit, couples the buffer, for producing one first ginseng according to the maximum for those channel impulse response values
Examine value；
One first filter circuit, couples the buffer, is referred to for filtering those preceding channel impulse response values with producing one second
Value；
One second filter circuit, couples the buffer, is referred to for filtering those rear channel impulse response values with producing one the 3rd
Value；And
One decision-making circuit, couples the counting circuit, first filter circuit and second filter circuit, for according to first ginseng
Examine value, second reference value and the 3rd reference value and produce the critical value.
3. echo detection circuit as claimed in claim 2, it is characterised in that first filter circuit and second filter circuit
It is for a rolling average counting circuit, is respectively further included comprising a buffer cell, the critical value generation circuit：
One detection circuit, couples the decision-making circuit, and first filtered electrical is indicated for producing one according to the size of the buffer cell
Whether road and second filter circuit have reached an indication signal of stable state；
Wherein, which produces the critical value according to the indication signal.
4. echo detection circuit as claimed in claim 2, it is characterised in that those preceding channel impulse response value systems are the target
The top n continuous channel impulse response value of channel impulse response value, the first filter circuit system calculate those preceding channel pulses and ring
For the average value that should be worth to produce second reference value, N is positive integer.
5. echo detection circuit as claimed in claim 1, it is characterised in that the critical value generation circuit includes：
One counting circuit, couples the buffer, for producing one first ginseng according to the maximum for those channel impulse response values
Examine value；
One first choice circuit, couples the buffer and the counting circuit, for comparing those preceding channel impulse response values with being somebody's turn to do
First reference value, to select multiple first medians, wherein those the first median systems are respectively those preceding channel impulse responses
The smaller of value and first reference value；
One first filter circuit, couples the first choice circuit, for being filtered to those first medians, to produce one the
Two reference values；
One second selection circuit, couples the buffer and the counting circuit, for comparing those rear channel impulse response values with being somebody's turn to do
First reference value, to select multiple second medians, wherein those the second median systems are respectively those rear channel impulse responses
The smaller of value and first reference value；
One second filter circuit, couples second selection circuit, for being filtered to those second medians, to produce one the
Three reference values；And
One decision-making circuit, couples first filter circuit and second filter circuit, for according to second reference value and this
Three reference values produce the critical value.
6. echo detection circuit as claimed in claim 5, it is characterised in that first filter circuit and second filter circuit
It is for a rolling average counting circuit, is respectively further included comprising a buffer cell, the critical value generation circuit：
One detection circuit, couples the decision-making circuit, and first filtered electrical is indicated for producing one according to the size of the buffer cell
Whether road and second filter circuit have reached an indication signal of stable state；
Wherein, which produces the critical value according to the indication signal.
7. echo detection circuit as claimed in claim 5, it is characterised in that those preceding channel impulse response value systems are the target
The top n continuous channel impulse response value of channel impulse response value, the first filter circuit system calculate those the first medians
For average value to produce second reference value, N is positive integer.
8. echo detection circuit as claimed in claim 1, it is characterised in that the buffer is one first buffer, the echo
Decision circuitry includes：
One second buffer, for storing a candidate channel impulse response value；And
One decision-making circuit, couples the critical value generation circuit, first buffer and second buffer, for comparing the mesh
Channel impulse response value and the critical value and the candidate channel impulse response value are marked, is somebody's turn to do when the destination channel impulse response value is less than
When one of critical value and the candidate channel impulse response value, which determines that the destination channel impulse response value is not right
Should be in the echo path of the multicarrier system.
9. echo detection circuit as claimed in claim 8, it is characterised in that the echo decision circuitry further includes：
One counter, couples the decision-making circuit, is less than the critical value and the candidate for counting the destination channel impulse response value
The read-around ratio of one of channel impulse response value, and a control signal is produced when a default value is counted up to；Wherein
The decision-making circuit determines that the candidate channel impulse response value corresponds to the echo of the multicarrier system according to the control signal
Path.
10. echo detection circuit as claimed in claim 9, it is characterised in that the decision-making circuit is rung in the destination channel pulse
When should be worth more than the critical value and the candidate channel impulse response value, which is stored in second caching
Device is to substitute the candidate channel impulse response value and reset the counter.
11. echo detection circuit as claimed in claim 9, it is characterised in that the corresponding multicarrier system of decision-making circuit output
The candidate channel impulse response value of the echo path of system is as an echo channel impulse response value, and the echo decision circuitry is more
Comprising：
One the 3rd buffer, couples the decision-making circuit, for storing the echo channel impulse response value；And
One decision circuitry, couples the 3rd buffer, for the storage content according to the 3rd buffer, calculates the overloading wave system
One channel length of system.
12. a kind of echo detection method for being applied to a multicarrier system, comprising：
Multiple channel impulse response values of the multicarrier system are stored, those channel impulse response values include a destination channel pulse
Response, multiple preceding channel impulse response values and multiple rear channel impulse response values；
Produced according to those preceding channel impulse response values and those rear channel impulse response values and correspond to destination channel pulse sound
The critical value that should be worth；And
Compare the destination channel impulse response value with the critical value to judge it is more whether the destination channel impulse response value corresponds to this
One echo path of carrier system.
13. echo detection method as claimed in claim 12, it is characterised in that this according to those preceding channel impulse response values with
The step of those rear channel impulse response values produce the critical value corresponding to the destination channel impulse response value includes：
The maximum according to those channel impulse response values produces one first reference value；
Those preceding channel impulse response values are filtered to produce one second reference value；
Those rear channel impulse response values are filtered to produce one the 3rd reference value；And
The critical value is produced according to first reference value, second reference value and the 3rd reference value.
14. echo detection method as claimed in claim 13, it is characterised in that those preceding channel impulse response value systems are the mesh
The top n continuous channel impulse response value of channel impulse response value is marked, those preceding channel impulse response values of the filtering are to produce this
For the average value of those preceding channel impulse response values of the step of second reference value system's calculating to produce second reference value, N is just whole
Number.
15. echo detection method as claimed in claim 12, it is characterised in that this according to those preceding channel impulse response values with
The step of those rear channel impulse response values produce the critical value corresponding to the destination channel impulse response value includes：
The maximum according to those channel impulse response values produces one first reference value；
Compare those preceding channel impulse response values and first reference value, to select multiple first medians, wherein those first
Median system is respectively the smaller of those preceding channel impulse response values and first reference value；
Those first medians are filtered, to produce one second reference value；
Compare those rear channel impulse response values and first reference value, to select multiple second medians, wherein those second
Median system is respectively the smaller of those rear channel impulse response values and first reference value；
Those second medians are filtered, to produce one the 3rd reference value；And
The critical value is produced according to second reference value and the 3rd reference value.
16. echo detection method as claimed in claim 15, it is characterised in that those preceding channel impulse response value systems are the mesh
The top n continuous channel impulse response value of channel impulse response value is marked, this is filtered those first medians to produce one
For the average value of those the first medians of the step of second reference value system's calculating to produce second reference value, N is positive integer.
17. echo detection method as claimed in claim 12, it is characterised in that this compare the destination channel impulse response value with
The critical value is to judge that the step of whether the destination channel impulse response value corresponds to the echo path of the multicarrier system includes：
Store a candidate channel impulse response value；And
Compare the destination channel impulse response value and the critical value and the candidate channel impulse response value；
Wherein, when the destination channel impulse response value is less than one of the critical value and the candidate channel impulse response value,
Determine that the destination channel impulse response value does not correspond to the echo path of the multicarrier system.
18. echo detection method as claimed in claim 17, it is characterised in that this compare the destination channel impulse response value with
The critical value is to judge that the step of whether the destination channel impulse response value corresponds to the echo path of the multicarrier system is more wrapped
Contain：
It is continuous less than one of the critical value and the candidate channel impulse response value to count the destination channel impulse response value
Number, and a control signal is produced when a default value is counted up to；
Wherein, this compares the destination channel impulse response value and foundation the step of the critical value and the candidate channel impulse response value
The control signal determines that the candidate channel impulse response value corresponds to the echo path of the multicarrier system.
19. echo detection method as claimed in claim 18, it is characterised in that this compare the destination channel impulse response value with
The step of critical value and the candidate channel impulse response value, lies in the destination channel impulse response value more than the critical value and is somebody's turn to do
During candidate channel impulse response value, the destination channel impulse response value is stored to substitute the candidate channel impulse response value and again
Put the read-around ratio.
20. echo detection method as claimed in claim 18, it is characterised in that this compare the destination channel impulse response value with
The time of the echo path of the corresponding multicarrier system of the step of critical value and candidate channel impulse response value system's output
Selecting channel impulse response value, this compares the destination channel impulse response value and the critical value as an echo channel impulse response value
To judge that the step of whether the destination channel impulse response value corresponds to the echo path of the multicarrier system further includes：
Store the echo channel impulse response value；And
According to the echo channel impulse response value, a channel length of the multicarrier system is calculated.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7292621B2 (en) * | 2001-05-08 | 2007-11-06 | Siemens Aktiengesellschaft | Method for detecting multipath signals |
| US20080112475A1 (en) * | 2006-11-14 | 2008-05-15 | Jun Ma | Detecting channel impulse magnitude response in digital communication systems |
| CN101686216A (en) * | 2008-09-25 | 2010-03-31 | 扬智电子（上海）有限公司 | Fine symbol timing synchronization method and device for orthogonal frequency division multiplexing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7292621B2 (en) * | 2001-05-08 | 2007-11-06 | Siemens Aktiengesellschaft | Method for detecting multipath signals |
| US20080112475A1 (en) * | 2006-11-14 | 2008-05-15 | Jun Ma | Detecting channel impulse magnitude response in digital communication systems |
| CN101686216A (en) * | 2008-09-25 | 2010-03-31 | 扬智电子（上海）有限公司 | Fine symbol timing synchronization method and device for orthogonal frequency division multiplexing system |
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|---|---|---|---|---|
| NO20210788A1 (en) * | 2021-06-17 | 2022-12-19 | Eltorque As | Multi plate reluctance motor |
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