CN109525519A - Symbol rate estimation device, symbol rate estimating method and adjacent channel interference detecting apparatus - Google Patents
Symbol rate estimation device, symbol rate estimating method and adjacent channel interference detecting apparatus Download PDFInfo
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- CN109525519A CN109525519A CN201710845310.7A CN201710845310A CN109525519A CN 109525519 A CN109525519 A CN 109525519A CN 201710845310 A CN201710845310 A CN 201710845310A CN 109525519 A CN109525519 A CN 109525519A
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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
- H04L25/0262—Arrangements for detecting the data rate of an incoming signal
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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
Abstract
The present invention provides a kind of symbol rate estimation device, symbol rate estimating method and adjacent channel interference detecting apparatus.The symbol rate estimation device includes a power spectrum density estimation unit, for estimating a power spectrum density of an input signal；One index search unit indexes for searching a cutoff frequency in the power spectrum density；One adjacent channel Interference Detection unit, for detecting whether the input signal includes adjacent channel interference, to generate a detection signal；One threshold adjustment unit is used to index amount threshold after generating an adjustment according to the detection signal；One index output unit, for according to amount threshold is indexed after the adjustment, exporting cutoff frequency index；And a symbol rate computing unit, it is indexed according to the cutoff frequency, calculates a symbol rate of the input signal.
Description
Technical field
The present invention is related to a kind of symbol rate estimation device, estimates especially with a kind of symbol rate suitable for satellite communication standard
Device is related.
Background technique
In satellite communication standard, such as first generation digital video Broadcast-Satellite (digital video
Broadcasting-satellite, DVB-S) standard, second generation digital video Broadcast-Satellite (digital video
Broadcasting-satellite 2, DVB-S2) standard and second generation digital video Broadcast-Satellite expand (DVB-
S2extensino, DVB-S2X) standard, receiving end receives signal to solve modulation, need to estimate the symbol rate that transmission end uses
(symbol rate).However, when receive signal include adjacent channel interference (adjacent channel interference,
When ACI), receiving end may mistakenly estimate symbol rate.
Summary of the invention
Therefore, the object of the invention is that providing a kind of symbol rate estimation device and side that can reduce adjacent channel interference effect
Method.
The present invention discloses a kind of symbol rate estimation device, includes a power spectrum density estimation unit, for estimating that one is defeated
Enter a power spectrum density of signal, wherein the power spectrum density includes multiple frequency indices, corresponds respectively to multiple power；
One index search unit indexes for searching a cutoff frequency in the power spectrum density；One adjacent channel Interference Detection unit,
For detecting whether the input signal includes adjacent channel interference, to generate a detection signal；One threshold adjustment unit is used to root
According to the detection signal that the input signal includes adjacent channel interference is represented, amount threshold is indexed after generating an adjustment；One index
Output unit, for according to amount threshold is indexed after the adjustment, exporting cutoff frequency index；And one symbol rate calculate it is single
Member indexes according to the cutoff frequency, calculates a symbol rate of the input signal.
The present invention separately discloses a kind of symbol rate estimating method, the power spectrum density comprising estimating an input signal,
In the power spectrum density include multiple frequency indices, correspond respectively to multiple power；One section is searched in the power spectrum density
Only frequency indices；Detect whether the input signal includes adjacent channel interference, to generate a detection signal；According to representing the input
Signal includes the detection signal of adjacent channel interference, indexes amount threshold after generating an adjustment；According to index number after the adjustment
Threshold value is measured, cutoff frequency index is exported；And indexed according to the cutoff frequency, calculate a symbol rate of the input signal.
The present invention separately discloses a kind of adjacent channel interference detecting apparatus, includes a power spectrum density estimation unit, is used to
Estimate a power spectrum density of an input signal, wherein the power spectrum density includes multiple frequency indices, is corresponded respectively to
Multiple power；One cutoff frequency index search unit indexes for finding out a cutoff frequency in the power spectrum density；And one
Accumulated unit indexes next multiple continuity indexes for adding up the cutoff frequency, and corresponding power is all larger than the cut-off
One index quantity of power；And an inspection unit, for checking whether the index quantity is equal to a default index amount threshold,
To generate a control signal；One output unit is used to according to the control signal, and it includes adjacent channel that output, which represents the input signal,
One detection signal of interference.
Feature, implementation and effect for the present invention, hereby attached drawing being cooperated to make preferred embodiment, detailed description are as follows.
Detailed description of the invention
Fig. 1 is the block diagram of a symbol rate estimation device.
Fig. 2 is the schematic diagram of a power spectrum density example of input signal.
Fig. 3 is the schematic diagram of a power spectrum density example of the input signal comprising adjacent channel interference.
Fig. 4 is the block diagram of one symbol rate estimation device of the embodiment of the present invention.
Fig. 5 is the flow chart of one symbol rate estimating method of the embodiment of the present invention.
Fig. 6 is the schematic diagram of one adjacent channel Interference Detection unit of the embodiment of the present invention.
Fig. 7 is the schematic diagram of a power spectrum density example of the input signal comprising adjacent channel interference.
Fig. 8 is the schematic diagram of a power spectrum density example of the input signal comprising adjacent channel interference.
Fig. 9 is the block diagram of one adjacent channel interference detecting apparatus of the embodiment of the present invention.
Symbol description
10,40 symbol rate estimation device
11,41,91 power spectrum density estimation unit
12,42,92 index search unit
13,43 index output unit
14,44 symbol rate computing unit
45 adjacent channel Interference Detection units
46 threshold adjustment units
451,93 accumulated unit
452,94 inspection unit
453,95 output unit
90 adjacent channel interference detecting apparatus
SinInput signal
PSD power spectrum density
PcoStop power
Ico_r1、Ico_l1、Ico_r1’、Ico_r2Cutoff frequency index
SR symbol rate
PmaxMaximum power
ImaxMaximum power frequency index
SACIDetect signal
Amount threshold is indexed after Nth1 ' adjustment
N2 index quantity
SctrlControl signal
Ico_r1_1、Ico_r1_Nth1、Ico_l1_1、Ico_l1_Nth1Frequency indices
Ico_r1_N1' frequency indices
Ico_r2_1、Ico_r2_2、Ico_r2_Nth2Frequency indices
Ico_r1_Nth1’、Ico_r1_N1' frequency indices
Specific embodiment
The term of following description is the idiom referring to the art, is added as this specification has part term
To illustrate or define, the explanation of the part term is to be subject to the explanation or definition of this specification.
Disclosure of the invention includes apparatus and method, may be Known Elements for the subelement of the device is independent
Part under the premise of not influencing to disclose the requirement with exploitativeness illustrates that the details of individual well known elements will be given below
Memorandum.In addition, method of the invention can be the form of software and/or firmware, it can be by the device of the invention or its equivalent dress
It sets to execute.
Fig. 1 is the block diagram of a symbol rate estimation device 10.Symbol rate estimation device 10 includes that a power spectrum density is estimated
Count unit 11, an index search unit 12, one index output unit 13 and a symbol rate computing unit 14.
Power spectrum density estimation unit 11 is used to estimate a power spectrum density (power of an input signal
Spectrum density, PSD).In one embodiment, power spectrum density estimation unit 11 is first to input signal SinCarry out Fu
Vertical leaf conversion estimates input signal S further according to signal after the conversion to generate signal after a conversioninPower spectrum density PSD.
Fig. 2 is the schematic diagram of a power spectrum density example of input signal, and horizontal axis represents frequency indices, and the longitudinal axis represents power, should
Power spectrum density include multiple frequency indices, correspond respectively to multiple power, thus according to power spectrum density PSD it can be seen that
Power corresponding to each frequency indices.
Index search unit 12 is used to search a cutoff frequency in the power spectrum density and indexes (cut-off
frequency index).Referring to FIG. 2, in one embodiment, index search unit 12 is found out in power spectrum density PSD
A maximum power Pmax, and found out accordingly corresponding to maximum power PMax'sOne maximum power frequency indexes Imax, as shown in Figure 2.
In addition, index search unit 12 can also find out the stop power P in power spectrum density PSDco(cut-off power),
Stop power PcoSuch as one of 3db, 6db or 9db stop power, as shown in Figure 2.Then, index search unit 12 is from maximum
Power-frequency indexes ImaxStart, turns right and find out stop power PcoCorresponding frequency indices are indexed as a cutoff frequency
Ico_r1, as shown in Fig. 2, and cutoff frequency is indexed Ico_r1A buffer (not shown) in deposit index output unit 13.
Output unit 13 is indexed according to an index amount threshold, exports cutoff frequency index.In one embodiment, it indexes
Output unit 13 judges that cutoff frequency indexes Ico_r1The one frequency indices I on the rightco_r1_1Whether corresponding power is less than cut-off
Power PcoIf frequency indices Ico_r1_1Corresponding power is less than stop power Pco, then an index quantity N1 is added 1, wherein rope
The initial value of argument amount N1 is 0, that is, N1=0+1=1.Then, index output unit 13 checks whether index quantity N1 is equal to
One index amount threshold Nth1, the buffer that index amount threshold Nth1 can for example be stored in index output unit 13 (are schemed not
Show).If indexing quantity N1 less than an index amount threshold Nth1, index output unit 14 continues to judge that cutoff frequency indexes
Ico_r1_1The one frequency indices I on the rightco_r1_2Whether power corresponding to (not shown) is less than stop power PcoIf frequency indices
Ico_r1_2Corresponding power is less than stop power Pco, then index quantity N1 is added into 1, that is, N1=1+1=2, until index number
It measures N1 and is equal to an index amount threshold Nth1, such as N1=Nth1=2000, the index output of output unit 13 is stored in buffer
In cutoff frequency index Ico_r1To symbol rate computing unit 14.
Similarly, index search unit 12 indexes I from maximum power frequencymaxStart, turns left and find out stop power PcoInstitute is right
The frequency indices answered index Ico_l1 as a cutoff frequency, as shown in Figure 2.Then, index output unit 13 checks cutoff frequency
Rate indexes Ico_l1The frequency indices I on the left sideco_l1_1~Ico_l1_Nth1Corresponding power is respectively less than stop power PcoAfterwards, it exports most
Big function cutoff frequency indexes Ico_l1To symbol rate computing unit 14.
Symbol rate computing unit 14 is indexed according to the cutoff frequency, calculates a symbol rate of the input signal.Implement one
In example, symbol rate computing unit 14 indexes I according to cutoff frequencyco_r1、Ico_l1Estimate input signal SinA symbol rate SR, lift
For example, symbol rate SR can be calculated with following formula:
SR=((Ico_r1–Ico_11)/FFT_size)*Fs
Wherein, FFT_size is power spectrum density estimation unit 11 to input signal SinCarry out solution when Fourier transform
Analysis degree, Fs are receiving end to input signal SinA sampling frequency (sampling rate) when being sampled.
It note that power spectrum density estimation unit 11, index search unit 12, index output unit 13 and symbol rate
Computing unit 14 can usually be realized by special hardware circuit, but can also be realized by software formula.In addition, power spectrum density is estimated
Count the various software and hardware realization sides of unit 11, index search unit 12, index output unit 13 and symbol rate computing unit 14
Formula is well known in the art the usual knowledge of this those skilled in the art, therefore it will not be described here.
Fig. 3 is the schematic diagram of a power spectrum density example of the input signal interfered comprising adjacent channel.When input is interrogated
Number comprising adjacent channel interfere, power spectrum density PSD may be as shown in Figure 3.I is indexed in real cutoff frequencyco_r1It is right
Side, the quantity N1 ' of frequency indices of the corresponding power less than stop power Pc is not up to index amount threshold Nth1 (for example, N1 '
=1500, Nth1=2000), cause index output unit 13 not export real cutoff frequency index Ico_r1, and may be defeated
The cutoff frequency index I to make mistakeco_r1', cause successive character rate computing unit 14 to be indexed according to the cutoff frequency of mistake
Ico_r1' estimate the symbol rate of the input signal, and obtain incorrect symbol rate.
Fig. 4 is the block diagram of one symbol rate estimation device 40 of the embodiment of the present invention.Symbol rate estimation device 40 includes a function
Rate spectral density estimation unit 41, an index search unit 42, one index output unit 43, a symbol rate computing unit 44, one
Adjacent channel Interference Detection unit 45 and a threshold adjustment unit 46.Fig. 5 is one symbol rate estimating method of the embodiment of the present invention
Flow chart 50.Please also refer to Fig. 4 and Fig. 5, wherein power spectrum density estimation unit 41 is used to estimate an input signal
One power spectrum density (step S510), index search unit 42 are used to search a cutoff frequency in the power spectrum density and index
(step S520).About power spectrum density estimation unit 41, index search unit 42, index output unit 43 and symbol rate meter
The detailed description of unit 44 is calculated, it can be respectively with reference to above-mentioned about power spectrum density estimation unit 11, index search unit 12, rope
Draw the detailed description of output unit 13 Yu symbol rate computing unit 44, this will not be repeated here.
Adjacent channel Interference Detection unit 45, to detect whether the input signal includes adjacent channel interference, to generate
One detection signal (step S530).Fig. 6 is the schematic diagram of one adjacent channel Interference Detection unit 45 of the embodiment of the present invention.It is real one
It applies in example, passage interference detection unit 45 includes an accumulated unit 451, an inspection unit 452 and an output unit 453.Fig. 7
For the schematic diagram of a power spectrum density example of the input signal interfered comprising adjacent channel, please also refer to Fig. 6 and Fig. 7,
Accumulated unit 451 is used to add up cutoff frequency index Ico_lIts following corresponding power is greater than stop power PcoFrequency indices
One index quantity NI2；In more detail, accumulated unit 451 judges that cutoff frequency indexes Ico_r2One frequency indices on the right
Ico_r2_1Whether corresponding power is greater than stop power PcoIf frequency indices Ico_r2_1Corresponding power is greater than stop power
Pco, then index quantity N2 is added 1, wherein the initial value of index quantity N2 is 0, that is, N2=0+1=1.Then, inspection unit
452 check whether index quantity N2 is equal to an index amount threshold Nth2, if index quantity N2 is less than an index amount threshold
Nth2, accumulated unit 451 continue to judge that cutoff frequency indexes Ico_r2_1The one frequency indices I on the rightco_r2_2Corresponding power
Whether stop power P is greater thancoIf frequency indices Ico_r2_2Corresponding power is greater than stop power Pco, then quantity N2 will be indexed
Add 1, that is, N2=1+1=2, until index quantity N2 is equal to index amount threshold Nth2, such as N2=Nth2=2000, inspection
One control signal S of the output of unit 452ctrlTo output unit 453.Output unit 453 is according to control signal SctrlOutput represents input
Signal SinA detection signal S comprising adjacent channel interferenceACITo threshold adjustment unit 46.
It note that adjacent channel Interference Detection unit 45 of the invention is not limited to embodiment shown in fig. 6, in other realities
It applies in example, whether adjacent channel Interference Detection unit 45 can detect the input signal using other methods dry comprising adjacent channel
It disturbs, to generate the detection signal.
Threshold adjustment unit 46 generates one and adjusts according to the detection signal that the input signal includes adjacent channel interference is represented
Amount threshold (step S540) is indexed after whole.In one embodiment, threshold adjustment unit 46 is according to detection signal SACI, reduce rope
Draw the index amount threshold Nth1 that output unit 43 exports cutoff frequency index accordingly, to index amount threshold after one adjustment of generation
Nth1 ' (such as Nth1=2000, Nth1 '=1000).Then, index output unit 43 is according to indexing amount threshold after adjustment,
Export cutoff frequency index (step S550).For example, referring to Fig. 8, even if indexing I in real cutoff frequencyco_rIt is right
Side, corresponding power are less than stop power PcFrequency indices quantity N1 ', because adjacent channel interference under the influence of drop (example
Such as N1 '=1500), the index quantity threshold after 46 output adjustment of threshold adjustment unit is also greater than due to frequency indices quantity N1 '
Value Nth1 ' (such as Nth1 '=1000), the still exportable real cutoff frequency of index output unit 43 index Ico_r1.Such one
Come, symbol rate computing unit 44 also can index I according to cutoff frequencyco_r1, correctly calculate input signal SinSymbol rate SR
(step S560).
In one embodiment, stop power PcoFor example, 3db stop power；In other words, adjacent channel Interference Detection list
First 45 systems generate detection signal S according to 3db stop powerACI, index output unit 43 is adjusted with control threshold adjustment unit 46
An index amount threshold of output 3db cutoff frequency index accordingly.However, the present invention is not limited thereto, in another embodiment
In, adjacent channel Interference Detection unit 45 generates detection signal S according to 3db stop powerACI, with control threshold adjustment unit
46 adjustment index output units 43 export an index amount threshold of 6db or 9db cutoff frequency index accordingly.
Fig. 9 is the block diagram of one adjacent channel interference detecting apparatus 90 of the embodiment of the present invention.Adjacent channel Interference Detection dress
Set 90 comprising a power spectrum density estimation unit 91, an index search unit 92, an accumulated unit 93, an inspection unit 94 with
An and output unit 95.Power spectrum density estimation unit 91 is used to estimate a power spectrum density of an input signal；Index
It searches unit 92 and is used to search cutoff frequency index in the power spectrum density；Accumulated unit 93 is used to add up the cutoff frequency
Index the index quantity that next its corresponding power is greater than the frequency indices of the stop power；Inspection unit 94 is used to check
Whether the index quantity is equal to a default index amount threshold, to generate a control signal；Output unit 95 is used to according to the control
Signal processed, output represent the detection signal that the input signal includes adjacent channel interference.Estimate about power spectrum density single
The detailed description of member 91, index search unit 92, accumulated unit 93, inspection unit 94 and output unit 95, can refer to respectively
It is above-mentioned about power spectrum density estimation unit 11, index search unit 12, accumulated unit 451, inspection unit 452 and output
The detailed description of unit 453, this will not be repeated here.
In conclusion the present invention is penetrated when detecting in input signal has adjacent channel interference, it is single to reduce index output
The member index amount threshold that output cutoff frequency indexes accordingly, the accuracy rate of Lai Tigao symbol rate estimation device.
Although the embodiment of the present invention is as described above, however those embodiments not are used to limit the present invention, this technology neck
The domain tool usually intellectual content that can express or imply according to the present invention imposes variation to technical characteristic of the invention, it is all this
Many variations may belong to patent protection scope sought by the present invention, and in other words, scope of patent protection of the invention should be by
Subject to claims define.
Claims (9)
1. a kind of symbol rate (symbol rate) estimation device, includes:
One power spectrum density (power spectrum density, PSD) estimation unit, for estimating the one of an input signal
Power spectrum density, wherein the power spectrum density includes multiple frequency indices, corresponds respectively to multiple power；
One index search unit indexes (cut-off frequency for searching a cutoff frequency in the power spectrum density
index)；
One adjacent channel interferes (adjacent channel interference, ACI) detection unit, for detecting the input
Whether signal includes adjacent channel interference, to generate a detection signal；
One threshold adjustment unit, for generating one according to the detection signal that the input signal includes adjacent channel interference is represented
Amount threshold is indexed after adjustment；
One index output unit, for according to amount threshold is indexed after the adjustment, exporting cutoff frequency index；And
One symbol rate computing unit indexes according to the cutoff frequency, calculates a symbol rate of the input signal.
2. symbol rate estimation device as described in claim 1, which is characterized in that the threshold adjustment unit system is by the reduction rope
Draw amount threshold to adjust the index amount threshold.
3. symbol rate estimation device as described in claim 1, which is characterized in that the adjacent channel Interference Detection unit includes:
One accumulated unit, for adding up cutoff frequency index next, power corresponding to it is greater than the frequency of the stop power
One index quantity of index；And
One inspection unit, for checking whether the index quantity is equal to a default index amount threshold；
One output unit, when the index quantity is equal to the default index amount threshold, it includes neighbour that output, which represents the input signal,
The detection signal of nearly passage interference.
4. symbol rate estimation device as described in claim 1, which is characterized in that cutoff frequency index corresponds to power frequency
One 3db power of spectrum density.
5. a kind of symbol rate (symbol rate) estimation method, includes:
Estimate a power spectrum density (power spectrum density, PSD) for an input signal, wherein the power spectrum
Density includes multiple frequency indices, corresponds respectively to multiple power；
Search cutoff frequency index (cut-off frequency index) in the power spectrum density；
Detect whether the input signal includes adjacent channel interference (adjacent channel interference, ACI), with
Generate a detection signal；
According to the detection signal that the input signal includes adjacent channel interference is represented, amount threshold is indexed after generating an adjustment；
According to amount threshold is indexed after the adjustment, cutoff frequency index is exported；And
It is indexed according to the cutoff frequency, calculates a symbol rate of the input signal.
6. symbol rate estimating method as claimed in claim 5, which is characterized in that the step of adjusting index amount threshold packet
It includes:
Reduce the index amount threshold.
7. symbol rate estimating method as claimed in claim 5, which is characterized in that detect whether the input signal includes neighbouring logical
Road interferes, and includes: the step of the detection signal to generate
Add up cutoff frequency index next, its corresponding power is greater than an index number of the frequency indices of the stop power
Amount；And
Check whether the index quantity is equal to a default index amount threshold；
When the index quantity is equal to the default index amount threshold, it includes adjacent channel interference that output, which represents the input signal,
The detection signal.
8. symbol rate estimating method as claimed in claim 5, which is characterized in that cutoff frequency index corresponds to power frequency
One 3db power of spectrum density.
9. a kind of adjacent channel interferes (adjacent channel interference, ACI) detection device, include:
One power spectrum density (power spectrum density, PSD) estimation unit, for estimating the one of an input signal
Power spectrum density, wherein the power spectrum density includes multiple frequency indices, corresponds respectively to multiple power；
One cutoff frequency index search unit indexes (cut-off for finding out a cutoff frequency in the power spectrum density
frequency index)；And
One accumulated unit indexes next multiple continuity indexes for adding up the cutoff frequency, and corresponding power is all larger than
One index quantity of the stop power；And
One inspection unit, for checking whether the index quantity is equal to a default index amount threshold, to generate a control signal；
One output unit is used to according to the control signal, and output represents the detection that the input signal includes adjacent channel interference
Signal.
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| CN109729027A (en) * | 2017-10-30 | 2019-05-07 | 晨星半导体股份有限公司 | Symbol rate estimation device and symbol rate estimating method |
| CN110061939A (en) * | 2019-04-19 | 2019-07-26 | 中国电子科技集团公司第三十六研究所 | A kind of symbol rate estimation method and apparatus |
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