CN109729027A - Symbol rate estimation device and symbol rate estimating method - Google Patents
Symbol rate estimation device and symbol rate estimating method Download PDFInfo
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- CN109729027A CN109729027A CN201711042891.7A CN201711042891A CN109729027A CN 109729027 A CN109729027 A CN 109729027A CN 201711042891 A CN201711042891 A CN 201711042891A CN 109729027 A CN109729027 A CN 109729027A
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- power
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Abstract
A kind of symbol rate estimation device generates unit comprising a power spectrum density, for estimating the power of an input signal, to generate a power spectrum density；One cutoff frequency indexes output unit, is used to export cutoff frequency index according to the power spectrum density；And a symbol rate computing unit, for indexing the symbol rate for calculating the input signal according to the cutoff frequency.
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 broadcasting-satellite (digital video
Broadcasting-satellite, DVB-S) standard, second generation digital video broadcasting-satellite (digital video
Broadcasting-satellite 2, DVB-S2) standard and second generation digital video broadcasting-satellite expands (DVB-S2
Extension, DVB-S2X) standard, receiving end receives signal to solve modulation, need to estimate the symbol rate that transmission end uses
(symbol rate), it is however generally that, receiving end is according to power spectrum density (the power spectrum for receiving signal
Density, PSD) carry out estimate symbol rate.However, receiving end may be made when receiving the power spectrum density imbalance of signal
The accuracy of estimate symbol rate.
Summary of the invention
Therefore, the object of the invention is that providing a kind of more accurate symbol rate estimation device and method.
The invention discloses a kind of symbol rate estimation devices, unit are generated comprising a power spectrum density, for estimating that one is defeated
Enter the power of signal, to generate a power spectrum density, wherein the power spectrum density includes multiple power, is corresponded respectively to more
A frequency indices；One cutoff frequency indexes output unit, is used to export cutoff frequency index according to the power spectrum density；With
And a symbol rate computing unit, for indexing the symbol rate for calculating the input signal according to the cutoff frequency.
The present invention separately discloses a kind of symbol rate estimating method, the power comprising estimating an input signal, to generate a power
Spectral density (power spectrum density, PSD), wherein the power spectrum density includes multiple power, is respectively corresponded
In multiple frequency indices；A cutoff frequency, which is exported, according to the power spectrum density indexes (cut-off frequency
indexes)；And the symbol rate for calculating the input signal is indexed according to the cutoff frequency.
Detailed description of the invention
Fig. 1 is the block diagram of one symbol rate estimation device of the embodiment of the present invention.
Fig. 2 is an example schematic of the power spectrum density of input signal.
Fig. 3 is the block diagram that cutoff frequency indexes output unit.
Fig. 4 is an example schematic of imbalance power spectral density.
Fig. 5 is the block diagram of one maximum power output unit of the embodiment of the present invention.
Fig. 6 is an example schematic of imbalance power spectral density.
Fig. 7 is the block diagram of one maximum power determining means of the embodiment of the present invention.
Fig. 8 is the flow chart of one maximum power determining method of the embodiment of the present invention.
Symbol description
10 symbol rate estimation devices
11 power spectrum densities generate unit
12 cutoff frequencies index output unit
13 symbol rate computing units
122,522 maximum power output unit
124 noise power output units
126 stop power output units
128 index output units
5221 first accumulated units
5222 second accumulated units
5223 third accumulated units
5224 maximum power determining meanss
52241 first judging units
52242 second judgment units
52243 output units
SinInput signal
PSD power spectrum density
Ico_r、Ico_lCutoff frequency index
SR symbol rate
PmaxMaximum power
RNG Search Area
FFT_size resolution ratio
PnoiseNoise power
PcoStop power
Pmax.rPractical maximum power
Pco.rPractical stop power
Ico_r.r、Ico_l.rPractical cutoff frequency index
Diff frequency indices gap
Diff.r actual frequency index difference away from
IrefReference frequency index
PSMCentral power summation
PSLLeft side power summation
PSRRight side power summation
PALLeft side power sum-total average
PARRight side power sum-total average
Iref-N1/2、I ref+N1/2Frequency indices
I ref-N2、I ref+N3Frequency indices
The first judging result of R1
The second judging result of R2
Specific embodiment
Fig. 1 is the block diagram of one symbol rate estimation device 10 of the embodiment of the present invention.Symbol rate estimation device 10 includes a function
Rate spectral density generates unit 11, cutoff frequency index output unit 12 and a symbol rate computing unit 13.
Power spectrum density generates the power that unit 11 is used to estimate an input signal, to generate a power spectrum density
(power spectrum density, PSD).In one embodiment, power spectrum density generates unit 11 first to input signal
SinFourier transform is carried out to generate a converted signals, estimates input signal S further according to the converted signalsinPower, with
Generate spectral density PSD.Fig. 2 is an example schematic of the power spectrum density of input signal, and horizontal axis represents frequency indices,
The longitudinal axis represents power, which includes multiple frequency indices, corresponds respectively to multiple power, therefore according to power frequency
Spectrum density PSD is it can be seen that power corresponding to each frequency indices.Note that power spectrum density generates unit 11 usually can be by
Special hardware circuit is realized, but can also be realized by software program.In addition, power spectrum density generates the various soft or hard of unit 11
Part implementation is to be well known in the art the usual knowledge of this those skilled in the art, therefore it will not be described here.
Cutoff frequency indexes output unit 12 and generates the power spectrum density that unit 11 generates according to power spectrum density
PSD, output cutoff frequency index (cut-off frequency indexes) Ico_r、Ico_l.Referring to FIG. 3, Fig. 3 is cutoff frequency
The block diagram of rate index output unit 12.In one embodiment, cutoff frequency index output unit 12 includes that a maximum power is defeated
Unit 122, a noise power output unit 124, a stop power computing unit 126 and an index output unit 128 out.Most
High-power output unit 122 exports a maximum power P according to power spectrum density PSDmax, for example, referring to FIG. 2, maximum
Power PmaxThe maximum power in the Search Area RNG for power spectrum density PSD, Search Area RNG be, for example, with
Centered on FFT_size/2, wherein FFT_size is that power spectrum density generates unit 11 for carrying out Fourier to the input signal
Resolution ratio when leaf transformation.Noise power output unit 124 exports a noise power P according to power spectrum density PSDnoise,
For example, referring to FIG. 2, noise power PnoiseIt is for the average value of the two sides power spectrum density PSD minimum power.Then,
Stop power computing unit 126 is according to maximum power PmaxWith noise power PnoiseCalculate a stop power Pco(such as 3db cut-off
Power), in one embodiment, stop power PcoFor maximum power PmaxWith noise power PnoiseAverage value.Finally, index is defeated
Unit 128 exports stop power P outcoCorresponding frequency indices index I as cutoff frequencyco_r、Ico_l, as shown in Figure 2.
Symbol rate computing unit 13 indexes the cutoff frequency that output unit 12 exports according to cutoff frequency and indexes Ico_r、Ico_l,
Calculate input signal SinA symbol rate SR.In one embodiment, symbol rate SR can be calculated with formula (1):
SR=((Ico_r–Ico_1)/FFT_size)*Fs(1)
Wherein, Fs is receiving end to input signal SinA sampling frequency (sampling rate) when being sampled.It please infuse
Meaning, symbol rate computing unit 13 can usually be realized by special hardware circuit, but can also be realized by software program.In addition, symbol
The various software and hardware implementations of rate computing unit 13 are to be well known in the art the usual knowledge of this those skilled in the art, therefore herein
It will not go into details.
It can be tilted toward one side when power spectrum density PSD imbalance.For example, referring to Fig. 4, Fig. 4 is imbalance
One example schematic of power spectrum density.As shown in figure 4, power spectrum density PSD is toward the right deflection.In this case,
The maximum power P that maximum power output unit 122 is exported according to power spectrum density PSDmaxIt can be than practical maximum power Pmax.r
Greatly, therefore, subsequent stop power computing unit 126 is according to maximum power PmaxCalculated stop power PcoEnd function than practical
Rate Pco.rGreatly, cutoff frequency indexes Ico_r、Ico_lBetween gap Diff than practical cutoff frequency index Ico_r.r、Ico_l.rBetween difference
Small away from Diff.r, symbol rate computing unit 13 indexes I according to cutoff frequencyco_r、Ico_lBetween gap Diff calculate relatively practical symbol
Number small symbol rate SR of rate, leads to the accuracy of 10 estimate symbol rate of symbol rate estimation device.
Fig. 5 is the block diagram of one maximum power output unit 522 of the embodiment of the present invention.Maximum power output unit 522 wraps
It is determined containing one first accumulated unit 5221, one second accumulated unit 5222, a third accumulated unit 5223 and a maximum power
Unit 5224.Fig. 6 is an example schematic of imbalance power spectral density, and the first accumulated unit 5221 is produced according to spectral density
Raw 11 output power spectral density PSD of unit adds up a reference frequency and indexes IrefCentered on (N1+1) a frequency indices institute it is right
The power answered, to export a central power summation (middle power sum) PSM.Central power summation PSMFormula (2) can be used
To indicate:
Wherein P (i) is ithPower corresponding to frequency indices.
Second accumulated unit 5222 generates 11 output power spectral density PSD of unit according to spectral density, adds up a reference
Frequency indices IrefPower corresponding to left side (N2+1) a frequency indices, to export a left side power summation (left-hand
power sum)PSL.Left side power summation PSLIt can be indicated with formula (3):
Third accumulated unit 5223 generates 11 output power spectral density PSD of unit according to spectral density, adds up a reference
Frequency indices IrefPower corresponding to right side (N3+1) a frequency indices, to export a right side power summation (right-hand
power sum)PSR.Right side power summation PSRIt can be indicated with formula (4):
In one embodiment, reference frequency indexes IrefFor FFT_size/2, then visual demand is designed by N1, N2, N3.?
In one embodiment, N1=N2=N3=N, reference frequency indexes (Iref-N~Iref-N) it is Search Area RNG shown in Fig. 2.
Maximum power determining means 5224 is according to central power summation PSM, left side power summation PSLWith right side power summation
PSR, determine maximum power Pmax.Referring to Fig. 7, Fig. 7 is the square of one maximum power determining means 5224 of the embodiment of the present invention
Figure.Fig. 8 is the flow chart of one maximum power determining method of the embodiment of the present invention.Please also refer to Fig. 7 and Fig. 8, maximum power is determined
Order member 5224 includes one first judging unit 52241, a second judgment unit 52242 and an output unit 52243.First
Judging unit 52241 judges left side power summation PSLWith right side power summation PSRIt is total whether one of the two is greater than central power
And PSM, to generate one first judging result R1 (step S810).For example, in power spectrum density PSD toward the right deflection
Under situation (as shown in Figure 6), when the first judging unit 52241 judges right side power summation PSRGreater than central power summation PSMWhen,
It generates corresponding first judging result R1 to second judgment unit 52242.Then, second judgment unit 52242 is according to
One judging result R1 judges left side power summation PSLWith right side power summation PSRWhichever is smaller in the two, is sentenced with generating one second
Disconnected result R2 (step S820).Example is held, second judgment unit 52242 is according to right side power summation PSRIt is total greater than central power
And PSMThe first judging result R1, judge left side power summation PSLWith right side power summation PSRWhichever is smaller in the two, when
Two judging units 52242 judge left side power summation PSLLess than right side power summation PSRWhen, generate corresponding second judgement
As a result R2 is to output unit 52243.Finally, output unit 52243 exports a power average value and makees according to the second judging result R2
For maximum power Pmax(step S830).Example is held, output unit 52243 is according to left side power summation PSLIt is total less than right side power
And PSRThe second judging result R2, export a power average value as maximum power Pmax.In one embodiment, output unit
52243 output left side power summation PSLAverage value P ALAs maximum power Pmax, left side power summation PSLAverage value P AL
It can be indicated with formula (5):
PAL=PSL/N2+1) (5)
Separately for example, in the case of power spectrum density PSD is toward left side deflection, when the first judging unit 52241 is sentenced
Disconnected left side power summation PSLGreater than central power summation PSMWhen, corresponding first judging result R1 is generated to the second judgement
Unit 52242.Then, second judgment unit 52242 is according to left side power summation PSLGreater than central power summation PSMFirst sentence
Disconnected result R1, judges left side power summation PSLWith right side power summation PSRWhichever is smaller in the two, works as second judgment unit
52242 judge right side power summation PSRLess than left side power summation PSLWhen, corresponding second judging result R2 is generated to defeated
Unit 52243 out.Finally, output unit 52243 is according to right side power summation PSRLess than left side power summation PSLSecond judgement
As a result R2 exports a power average value as maximum power Pmax.In one embodiment, output unit 52243 exports right side power
Summation PSRAverage value as maximum power Pmax, right side power summation PSRAverage value P ARIt can be indicated with formula (6):
PAR=PSR/N3+1) (6)
In this way, even if having unbalanced situation in power spectrum density PSD, compared to maximum power output unit
122, the maximum power P that maximum power output unit 522 exportsmaxIt can be compared with closing to reality maximum power Pmax.r, therefore, configuration is most
50 (not shown) of symbol rate estimation device of high-power output unit 522 can estimate more accurate symbol rate.Note that in addition to
Outside maximum power output unit 522, symbol rate estimation device 50 and the other elements of symbol rate estimation device 10 are all the same, herein
It is not repeated to illustrate.
It note that in the above-described embodiments, as left side power summation PSLLess than right side power summation PSRWhen, output unit
52243 output left side power summation PSLAverage value P ALAs maximum power Pmax, however the present invention is not limited thereto, at it
In his embodiment, as left side power summation PSLLess than right side power summation PSRWhen, output unit 52243 is exportable and with reference to frequency
Rate indexes IrefThe relevant power average value of power is as maximum power P corresponding to the frequency indices of left side at leastmax。
It note that in the above-described embodiments, as right side power summation PSRLess than left side power summation PSLWhen, output unit
52243 output right side power summation PSRAverage value as maximum power Pmax, however the present invention is not limited thereto, at other
In embodiment, as right side power summation PSRLess than left side power summation PSLWhen, the exportable power averaging of output unit 52243
Value is used as maximum power Pmax, wherein the power average value is to be relevant to reference frequency index IrefThe frequency indices of right side at least
Corresponding power.
In conclusion central power summation, left side power summation and right side power of the present invention according to power spectrum density
Summation determines maximum power, the accuracy of estimate symbol rate when improving power spectrum density imbalance.
Claims (14)
1. a kind of symbol rate estimation device, includes:
One power spectrum density PSD generates unit, estimates the power of an input signal, to generate a power spectrum density, wherein
The power spectrum density includes multiple power, corresponds respectively to multiple frequency indices；
One cutoff frequency indexes output unit, exports cutoff frequency index according to the power spectrum density；And
One symbol rate computing unit indexes the symbol rate for calculating the input signal according to the cutoff frequency.
2. symbol rate estimation device as described in claim 1, which is characterized in that the cutoff frequency indexes output unit and includes:
One maximum power output unit exports a maximum power according to the power spectrum density；
One noise power output unit exports a noise power according to the power spectrum density；
One stop power computing unit, according to the maximum power and one stop power of noise power calculation；And
One index output unit, exports frequency indices corresponding to the stop power and indexes as the cutoff frequency.
3. symbol rate estimation device as claimed in claim 2, which is characterized in that the maximum power output unit includes:
One first accumulated unit adds up power corresponding to (N1+1) a frequency indices centered on reference frequency index,
To export a central power summation；
One second accumulated unit adds up power corresponding to (N2+1) a frequency indices of reference frequency index left side, with output
One left side power summation；
One third accumulated unit adds up power corresponding to (N3+1) a frequency indices of reference frequency index right side, with output
One right side power summation；And
One maximum power determining means is determined according to the central power summation, the left side power summation and the right side power summation
The maximum power.
4. symbol rate estimation device as claimed in claim 3, which is characterized in that the maximum power determining means includes:
One first judging unit, judges whether one of both the left side power summation and right side power summation are greater than the center function
Rate summation, to generate one first judging result；
One second judgment unit judges both the left side power summation and the right side power summation according to first judging result
Middle whichever is larger, to generate one second judging result；And
One output unit exports a power average value as the maximum power according to second judging result.
5. symbol rate estimation device as claimed in claim 4, which is characterized in that second judging result points out the left side power
When summation is less than the right side power summation, which is to be relevant to the frequency rope of reference frequency index left side at least
Draw corresponding power.
6. symbol rate estimation device as claimed in claim 4, which is characterized in that second judging result points out the right side power
When summation is less than the left side power summation, which is to be relevant to the frequency rope of reference frequency index right side at least
Draw corresponding power.
7. symbol rate estimation device as claimed in claim 3, which is characterized in that reference frequency index is for FFT_size/
2, and FFT_size is that the power spectrum density generates unit for carrying out resolution when Fourier transform to the input signal
Rate.
8. a kind of symbol rate estimating method, includes:
Estimate the power of an input signal, to generate a power spectrum density PSD, wherein the power spectrum density includes multiple function
Rate corresponds respectively to multiple frequency indices；
Cutoff frequency index is exported according to the power spectrum density；And
The symbol rate for calculating the input signal is indexed according to the cutoff frequency.
9. symbol rate estimating method as claimed in claim 8, which is characterized in that export the cut-off according to the power spectrum density
The step of frequency indices includes:
A maximum power is exported according to the power spectrum density；
A noise power is exported according to the power spectrum density；
According to the maximum power and one stop power of noise power calculation；And
Frequency indices corresponding to the stop power are exported to index as the cutoff frequency.
10. symbol rate estimation device as claimed in claim 9, which is characterized in that export this most according to the power spectrum density
Powerful step includes:
Power corresponding to (N1+1) a frequency indices centered on the accumulative index by a reference frequency, to export a central power
Summation；
Add up power corresponding to (N2+1) a frequency indices of reference frequency index left side, to export a left side power summation；
Add up power corresponding to (N3+1) a frequency indices of reference frequency index right side, to export a right side power summation；
And
According to the central power summation, the left side power summation and the right side power summation, the maximum power is determined.
11. symbol rate estimation device as claimed in claim 10, which is characterized in that according to the central power summation, the left side
Power summation and the right side power summation, the step of determining the maximum power include:
Judge whether one of both the left side power summation and right side power summation are greater than the central power summation, to generate one
First judging result；
According to first judging result, judge that whichever is larger in both the left side power summation and the right side power summation, to produce
Raw one second judging result；And
According to second judging result, a power average value is exported as the maximum power.
12. symbol rate estimation device as claimed in claim 11, which is characterized in that second judging result points out the left side function
When rate summation is less than the right side power summation, which is to be relevant to the frequency of reference frequency index left side at least
The corresponding power of index.
13. symbol rate estimation device as claimed in claim 11, which is characterized in that second judging result points out the right side function
When rate summation is less than the left side power summation, which is to be relevant to the frequency of reference frequency index right side at least
The corresponding power of index.
14. symbol rate estimation device as claimed in claim 10, which is characterized in that reference frequency index is for FFT_
Size/2, and FFT_size is that the power spectrum density generates unit for carrying out one when Fourier transform to the input signal
Resolution ratio.
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| CN201711042891.7A CN109729027A (en) | 2017-10-30 | 2017-10-30 | Symbol rate estimation device and symbol rate estimating method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016200095A1 (en) * | 2015-06-08 | 2016-12-15 | 삼성전자주식회사 | Device and method for transmitting filter bank multi-carrier symbols in wireless communication system |
| CN106998583A (en) * | 2016-01-22 | 2017-08-01 | 中兴通讯股份有限公司 | Poewr control method and device |
| CN109525519A (en) * | 2017-09-19 | 2019-03-26 | 晨星半导体股份有限公司 | Symbol rate estimation device, symbol rate estimating method and adjacent channel interference detecting apparatus |
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2017
- 2017-10-30 CN CN201711042891.7A patent/CN109729027A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016200095A1 (en) * | 2015-06-08 | 2016-12-15 | 삼성전자주식회사 | Device and method for transmitting filter bank multi-carrier symbols in wireless communication system |
| CN106998583A (en) * | 2016-01-22 | 2017-08-01 | 中兴通讯股份有限公司 | Poewr control method and device |
| CN109525519A (en) * | 2017-09-19 | 2019-03-26 | 晨星半导体股份有限公司 | Symbol rate estimation device, symbol rate estimating method and adjacent channel interference detecting apparatus |
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Application publication date: 20190507 |