CN108270705A - The demodulating equipment and demodulation method of a kind of FM signal - Google Patents
The demodulating equipment and demodulation method of a kind of FM signal Download PDFInfo
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- CN108270705A CN108270705A CN201611249530.5A CN201611249530A CN108270705A CN 108270705 A CN108270705 A CN 108270705A CN 201611249530 A CN201611249530 A CN 201611249530A CN 108270705 A CN108270705 A CN 108270705A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/14—Demodulator circuits; Receiver circuits
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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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/14—Demodulator circuits; Receiver circuits
- H04L27/144—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
- H04L27/148—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using filters, including PLL-type filters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/14—Demodulator circuits; Receiver circuits
- H04L27/144—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements
- H04L27/152—Demodulator circuits; Receiver circuits with demodulation using spectral properties of the received signal, e.g. by using frequency selective- or frequency sensitive elements using controlled oscillators, e.g. PLL arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Power Engineering (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The present invention relates to the communications fields, disclose the demodulating equipment and demodulation method of a kind of FM signal.The demodulating equipment of the FM signal includes：Forward-direction filter, for obtaining the first signal of the minimum phase information for carrying FM signal；Compensation mechanism for the initial phase according to feedback signal and FM signal, generates thermal compensation signal；Frequency deviation arrester, for according to thermal compensation signal, eliminating the residual frequency departure in the first signal, obtaining second signal；Interference eliminator, for according to feedback signal, eliminating the intersymbol interference of second signal, obtaining third signal；Self-adaptive decision device for carrying out self-adaptive decision according to third signal, exports the demodulation result of FM signal.Embodiment of the present invention, in the demodulating process of FM signal, the residual frequency departure of FM signal is eliminated by generating thermal compensation signal, avoids influence of the residual frequency departure to the demodulation result of FM signal, so that the demodulating process of FSK FM signals is more accurate, demodulation result is more accurate.
Description
Technical field
The present invention relates to the communications field, the demodulating equipment and demodulation method of more particularly to a kind of FM signal.
Background technology
FSK (Frequency-shift keying, i.e. frequency displacement are good for control) signal is that one kind is used to carry out high speed data transfer
Signal.FM signal in demodulating process, needs to consider remaining frequency deviation in FM signal as FM signal.These are residual
Frequency deviation is stayed to exist so that the demodulating process of FM signal is not correlation demodulation, so as to influence the demodulation result of FM signal.
Invention content
The demodulating equipment and demodulation method that are designed to provide a kind of FM signal of embodiment of the present invention so that adjusting
In the demodulating process of frequency signal, the residual frequency departure in FM signal can be voluntarily eliminated, so as to improve the demodulation result of FM signal
Accuracy.
In order to solve the above technical problems, embodiments of the present invention provide a kind of demodulating equipment of FM signal, including：
Forward-direction filter, for obtaining the first signal of the minimum phase information for carrying FM signal；Compensation mechanism, for according to anti-
The initial phase of feedback signal and FM signal generates thermal compensation signal；Frequency deviation arrester, for according to thermal compensation signal, eliminating the
Residual frequency departure in one signal, obtains second signal；Interference eliminator, for according to feedback signal, eliminating the code of second signal
Between interfere, obtain third signal；Self-adaptive decision device for carrying out self-adaptive decision according to third signal, exports FM signal
Demodulation result.
Embodiments of the present invention additionally provide a kind of demodulation method of FM signal, including：Acquisition carries frequency modulation letter
Number minimum phase information the first signal；According to feedback signal and the initial phase of FM signal, thermal compensation signal is generated；Root
According to thermal compensation signal, the residual frequency departure in the first signal is eliminated, obtains second signal；According to feedback signal, second signal is eliminated
Intersymbol interference obtains third signal；Self-adaptive decision is carried out according to third signal, exports the demodulation result of FM signal.
Embodiment of the present invention in terms of existing technologies, in the demodulating process of FM signal, is compensated by generating
Signal eliminates the residual frequency departure of FM signal, so as to avoid influence of the residual frequency departure to the demodulation result of FM signal, makes
The demodulating process for obtaining FSK FM signals is more accurate, and demodulation result is more accurate.
Further, compensation mechanism includes：Phase discriminator, for according to feedback signal and second signal, detecting local signal
With the phase difference of FM signal, and fourth signal is exported；Loop gain adjuster, for the parameter according to fourth signal to loop
It is updated, obtains phase control words；Initial phase estimator, for estimating the initial phase of FM signal according to local signal
Position；Digital oscillator for the initial phase according to phase control words and FM signal, generates the thermal compensation signal.
Further, demodulating equipment further includes local vector generator and feedback filter；Self-adaptive decision device is additionally operable to
According to demodulation result, court verdict is obtained, and according to court verdict, obtain the index of modulation；Local vector generator is used for basis
The index of modulation and court verdict, estimate out local signal；Feedback filter is used to, according to the local signal, obtain feedback signal.
Further, local vector generator sums to the product of the index of modulation and court verdict, and by summation
As a result it is used as local signal.
Further, self-adaptive decision device is tied by court verdict, obtaining the corresponding demodulation of maximum court verdict
The value of fruit, and according to the value of the maximum corresponding demodulation result of court verdict, calculate the index of modulation.
Description of the drawings
Fig. 1 is the demodulating equipment structure diagram according to the FM signal of first embodiment of the invention；
Fig. 2 is the demodulating equipment structure diagram according to the FM signal of second embodiment of the invention；
Fig. 3 is the flow chart according to the demodulation method of the FM signal of third embodiment of the invention；
Fig. 4 is the acquisition flow chart according to the thermal compensation signal of four embodiment of the invention；
Fig. 5 is the acquisition flow chart according to the feedback signal of four embodiment of the invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to each reality of the present invention
The mode of applying is explained in detail.However, it will be understood by those skilled in the art that in each embodiment of the present invention,
In order to make the reader understand this application better, many technical details are proposed.But even if without these technical details and base
In the various changes and modifications of following embodiment, the application technical solution claimed can also be realized.
The first embodiment of the present invention is related to a kind of demodulating equipments of FM signal.As shown in Figure 1, the demodulating equipment packet
Include forward-direction filter 11, compensation mechanism 12, frequency deviation arrester 13, interference eliminator 14 and self-adaptive decision device 15.
The FM signal (y (n) in fsk signal, i.e. figure) that forward-direction filter 11 inputs for reception, and according to the frequency modulation
Signal obtains the first signal of the minimum phase information for carrying FM signal.Forward-direction filter 11 by the first signal export to
Frequency deviation arrester 13, frequency deviation arrester 13 can also receive the thermal compensation signal from compensation mechanism 12.Frequency deviation arrester 13 is receiving
To after the first signal and thermal compensation signal, so that it may eliminate the residual frequency departure in the first signal, generation second according to the thermal compensation signal
Signal.Specifically,
Yrt (n)=ytd (n) × ej(nco(n)×β)；
Wherein, yrt (n) is second signal, and ytd (n) is the first signal, and nco (n) is thermal compensation signal, and β is penalty coefficient, n
For sequence index.
In the present embodiment, thermal compensation signal can be by compensation mechanism 12 according to feedback signal and the initial phase of FM signal
Generation.The feedback signal can feed back the index of modulation of output according to self-adaptive decision device 15 and court verdict obtains.
Frequency deviation arrester 13 exports second signal to interference eliminator 14.Interference eliminator 14 is receiving second signal
When, according to feedback signal, the intersymbol interference of second signal is eliminated, obtains third signal.
Interference eliminator 14 exports third signal to self-adaptive decision device 15.Self-adaptive decision device 15 is receiving third
During signal, self-adaptive decision is carried out according to the third signal, exports the demodulation result of FM signal.
It is noted that interference eliminator 14 can feed back output court verdict and the index of modulation after self-adaptive decision,
Present embodiment can generate feedback signal, and the feedback signal of generation is divided according to by the index of modulation of the output and court verdict
Other input offset mechanism 12 and interference eliminator 14.
In the demodulating process of FM signal, the residual of FM signal is eliminated by generating thermal compensation signal for present embodiment
Frequency deviation is stayed, so as to avoid influence of the residual frequency departure to the demodulation result of FM signal so that the demodulating process of FSK FM signals
More precisely, demodulation result is more accurate.
Second embodiment of the present invention is related to a kind of demodulating equipment of FM signal.Second embodiment is real first
Being further improved of doing on the basis of mode is applied, is mainly theed improvement is that：Second embodiment further provides a kind of benefit
Repay signal and the acquisition methods of feedback signal.
As shown in Fig. 2, in present embodiment, frequency deviation arrester is realized that interference eliminator is realized by adder by multiplier,
Compensation mechanism then includes phase discriminator, loop gain adjuster, initial phase estimator and digital oscillator.Wherein,
Phase discriminator according to feedback signal and second signal, can detect the phase difference of local signal and FM signal, output the
Four signals.Specifically,
PdOut (n)=yti (n) * conj (yrt (n))；
Wherein, pdOut (n) is the fourth signal of phase discriminator output, and yti (n) is feedback signal, and yrt (n) is the second letter
Number.
Phase discriminator exports fourth signal to loop gain adjuster.Loop gain adjuster is according to the fourth signal loop
Parameter be updated, obtain phase control words.Specifically,
Wherein, a takes 1,2 ... n, and phyVec (n) is phase control words, and freqVec (n) is frequency control word, Kp be than
Just coefficient, Ki are integral coefficient.
Loop gain adjuster exports phase control words to digital oscillator.Digital oscillator is also received from initial phase
The estimated result of the initial phase of position estimator output.In present embodiment, initial phase estimator can pass through known local
Signal estimates the phase of initial fsk signal, and the estimated result is exported to digital oscillator.Digital oscillator is according to reception
The phase control words and the estimated result of fsk signal initial phase arrived generate thermal compensation signal.Specifically,
Nco (n)=iniPhy+nco (n-1)+phyVec (n)
Wherein, iniPhy is the estimated result of fsk signal initial phase.
In present embodiment, the demodulating equipment of FM signal further includes local vector generator and feedback filter.It is local
The index of modulation and court verdict that vector generator can be exported according to self-adaptive decision device, the local signal estimated of generation.Tool
Body,
Wherein, symVec (n) is the local signal estimated out, and dOut (a) is court verdict, and hIdxT (a) is for modulation
Number.
Feedback filter and forward-direction filter in present embodiment are the minimum phase systems relative to formed filter.
The local signal input feedback wave filter that will be estimated, feedback filter can obtain feedback signal according to the local signal.
The court verdict that exports is after self-adaptive decision device carries out self-adaptive decision：
Wherein, ysd (n) is third signal, and hIdx (m) is the index of modulation, and k is demodulation result, can use 1 and -1, Re () table
Show and take reality, ArgMaxf (x) is represented when f (x) is maximized, the value of x.
It willIt substitutes into, can obtain：
The value of dOut (n) when calculating k=-1 and k=1 respectively after all dOut (n) are calculated, can obtain maximum
The corresponding k values of dOut (n), and according to the corresponding k values of dOut (n) of the maximum, calculate the index of modulation, specifically,
It is the maximum corresponding k of dOut (n) that k in this formula, which is,.
Third embodiment of the present invention is related to a kind of demodulation method of FM signal.The idiographic flow of present embodiment is such as
Shown in Fig. 3：
Step 301：Obtain the first signal of the minimum phase information for carrying FM signal.
Step 302：According to feedback signal and the initial phase of FM signal, thermal compensation signal is generated.
The index of modulation and court verdict that the feedback signal can be exported by self-adaptive decision obtain.Present embodiment can pass through
Known local signal estimates the initial phase of the phase of initial fsk signal, i.e. FM signal.
Step 303：According to the thermal compensation signal, the residual frequency departure in the first signal is eliminated, obtains second signal.
Step 304：According to the feedback signal, the intersymbol interference of second signal is eliminated, obtains third signal.
Step 305：Self-adaptive decision is carried out according to the third signal, exports the demodulation result of FM signal.
The output court verdict and index of modulation can also be fed back after self-adaptive decision, present embodiment can be according to by the output
The index of modulation and court verdict generation feedback signal
The step of various methods divide above, be intended merely to describe it is clear, when realization can be merged into a step or
Certain steps are split, are decomposed into multiple steps, as long as comprising identical logical relation, all in the protection domain of this patent
It is interior；To inessential modification is either added in algorithm in flow or introduces inessential design, but do not change its algorithm
Core design with flow is all in the protection domain of the patent.
It is not difficult to find that present embodiment be with the corresponding embodiment of the method for first embodiment, present embodiment can be with
First embodiment is worked in coordination implementation.The relevant technical details mentioned in first embodiment still have in the present embodiment
Effect, in order to reduce repetition, which is not described herein again.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in
In first embodiment.
The 4th embodiment of the present invention is related to a kind of demodulation method of FM signal.4th embodiment is in third reality
Being further improved of doing on the basis of mode is applied, is mainly theed improvement is that：4th real mode further provides a kind of compensation
The acquisition methods of signal and feedback signal.
In present embodiment, the idiographic flow of thermal compensation signal is generated according to the initial phase of feedback signal and FM signal
As shown in Figure 4：
Step 401：According to feedback signal and second signal, the phase difference of detection local signal and the FM signal, and
Export fourth signal.
PdOut (n)=yti (n) * conj (yrt (n))；
Wherein, pdOut (n) is fourth signal, and yti (n) is feedback signal, and yrt (n) is second signal.
Step 402：According to the fourth signal, phase control words are obtained.
Wherein, phyVec (n) is phase control words, and freqVec (n) is frequency control word, and Kp is proportionality coefficient, and Ki is product
Divide coefficient.
Step 403：Estimate the initial phase of FM signal.
The phase of initial fsk signal can be estimated by known local signal.
Step 404：According to phase control words and the initial phase of FM signal, thermal compensation signal is generated.
Nco (n)=iniPhy+nco (n-1)+phyVec (n)
Wherein, iniPhy is the estimated result of fsk signal initial phase.
In addition, present embodiment can obtain feedback signal in the following manner, idiographic flow is as shown in Figure 5：
Step 501：According to demodulation result, court verdict is obtained, and according to the court verdict, obtain the index of modulation.
Court verdict is：
The maximum corresponding k values of dOut (n) are obtained, and according to the corresponding k values of dOut (n) of the maximum, calculate modulation system
Number, specifically,
Step 502：According to the index of modulation and court verdict, local signal is estimated.
Step 503：According to the local signal, feedback signal is obtained.
Since second embodiment is corresponded with present embodiment, present embodiment can be mutual with second embodiment
Match implementation.The relevant technical details mentioned in second embodiment are still effective in the present embodiment, implement second
The attainable technique effect of institute can similarly be realized in the present embodiment in mode, no longer superfluous here in order to reduce repetition
It states.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in second embodiment.
It will be understood by those skilled in the art that the respective embodiments described above are to realize specific embodiments of the present invention,
And in practical applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (10)
1. a kind of demodulating equipment of FM signal, which is characterized in that including：
Forward-direction filter, for obtaining the first signal of the minimum phase information for carrying FM signal；
Compensation mechanism for the initial phase according to feedback signal and the FM signal, generates thermal compensation signal；
Frequency deviation arrester, for according to the thermal compensation signal, eliminating the residual frequency departure in first signal, obtaining the second letter
Number；
Interference eliminator, for according to the feedback signal, eliminating the intersymbol interference of the second signal, obtaining third signal；
Self-adaptive decision device for carrying out self-adaptive decision according to the third signal, exports the demodulation knot of the FM signal
Fruit.
2. the demodulating equipment of FM signal according to claim 1, which is characterized in that the compensation mechanism includes：
Phase discriminator, for according to the feedback signal and the second signal, detecting the phase of local signal and the FM signal
Potential difference, and export fourth signal；
Loop gain adjuster for being updated according to the fourth signal to the parameter of loop, obtains phase control words；
Initial phase estimator, for estimating the initial phase of the FM signal according to local signal；
Digital oscillator for the initial phase according to the phase control words and the FM signal, generates the compensation letter
Number.
3. the demodulating equipment of FM signal according to claim 1, which is characterized in that the demodulating equipment further includes local
Vector generator and feedback filter；
The self-adaptive decision device is additionally operable to, according to the demodulation result, obtain court verdict, and according to the court verdict, obtain
Take the index of modulation；
The local vector generator is used for according to the index of modulation and the court verdict, estimates out local signal；
The feedback filter is used for according to the local signal, obtains the feedback signal.
4. the demodulating equipment of FM signal according to claim 3, which is characterized in that the local vector generator is to institute
The product for stating the index of modulation and the court verdict is summed, and using the result of the summation as the local signal.
5. the demodulating equipment of FM signal according to claim 3, which is characterized in that the self-adaptive decision device by
In the court verdict, the value of the maximum corresponding demodulation result of court verdict is obtained, and according to the court verdict of the maximum
The value of corresponding demodulation result calculates the index of modulation.
6. a kind of demodulation method of FM signal, which is characterized in that including：
Obtain the first signal of the minimum phase information for carrying FM signal；
According to feedback signal and the initial phase of the FM signal, thermal compensation signal is generated；
According to the thermal compensation signal, the residual frequency departure in first signal is eliminated, obtains second signal；
According to the feedback signal, the intersymbol interference of the second signal is eliminated, obtains third signal；
Self-adaptive decision is carried out according to the third signal, exports the demodulation result of the FM signal.
7. the demodulation method of FM signal according to claim 6, which is characterized in that described according to feedback signal and institute
The initial phase of FM signal is stated, thermal compensation signal is generated, specifically includes：
According to the feedback signal and the second signal, the phase difference of detection local signal and the FM signal, and export
Fourth signal；
According to the fourth signal, phase control words are obtained；
According to the phase control words and the initial phase of the FM signal, the thermal compensation signal is generated.
8. the demodulation method of FM signal according to claim 6, which is characterized in that the feedback signal passes through with lower section
Formula obtains：
According to the demodulation result, court verdict is obtained；
According to the court verdict, the index of modulation is obtained；
According to the index of modulation and the court verdict, local signal is estimated out；
According to the local signal, the feedback signal is obtained.
9. the demodulation method of FM signal according to claim 8, which is characterized in that according to the index of modulation and institute
Court verdict is stated, is estimated out in local signal,
It sums to the product of the index of modulation and the court verdict, and using the result of the summation as the local
Signal.
10. the demodulation method of FM signal according to claim 8, which is characterized in that it is described according to court verdict, it obtains
In the index of modulation, specifically include：
In the court verdict of output, the value of the maximum corresponding demodulation result of court verdict is obtained；
According to the value of the maximum corresponding demodulation result of court verdict, the index of modulation is calculated.
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| CN111212006A (en) * | 2019-12-25 | 2020-05-29 | 奉加微电子（上海）有限公司 | Signal demodulation system and demodulation method |
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