CN110191072A - A kind of recognition methods, receiver and the transmitter of quadrature amplitude modulation type - Google Patents
A kind of recognition methods, receiver and the transmitter of quadrature amplitude modulation type Download PDFInfo
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- CN110191072A CN110191072A CN201910498050.XA CN201910498050A CN110191072A CN 110191072 A CN110191072 A CN 110191072A CN 201910498050 A CN201910498050 A CN 201910498050A CN 110191072 A CN110191072 A CN 110191072A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0012—Modulated-carrier systems arrangements for identifying the type of modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
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- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
This application discloses recognition methods, receiver and the transmitters of a kind of quadrature amplitude modulation type, and the method includes receiving signal of communication；Judge whether signal of communication is id signal；If signal of communication is id signal, id signal is parsed, obtains modulation type corresponding to id signal；The subsequent useful signal of id signal is demodulated using the demodulation modes to match with modulation type.By the above-mentioned means, the application can be improved the accuracy and real-time of receiver Adaptive matching demodulation modes.
Description
Technical field
This application involves signal of communication processing technology field, more particularly to quadrature amplitude modulation type recognition methods,
Receiver and transmitter.
Background technique
Quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM) is one kind in two quadrature carriers
The modulation system of enterprising line amplitude modulation, signal amplitude change simultaneously with phase, i.e. quadrature carrier modulation technology and more level
The fusion of amplitude-shift keying two ways, therefore QAM signal shows as the characteristic of non-permanent envelope.QAM signal is utilized with high spectrum
The advantage of rate, high power spectrum density is widely used in the broadbands such as high-speed figure television transmission system application field.
QAM in digital display circuit is a kind of vector modulation technique, by bit information with Gray code or differential encoding (because not
With consensus standard and it is different) mode be mapped to planisphere, i.e. bit information is converted to symbolic information.Planisphere level with
Vertical direction respectively represents the I/Q component of the symbol, modulates using amplitude.Then, I/Q component is modulated to mutually respectively
On orthogonal two carrier wave cos ω t and sin ω t.
The demodulating process of receiver is by carrying out orthogonal coherent demodulation to the QAM signal that receives, then with low-pass filtering
Device (Low Pass Filter, LPF) filters out the high fdrequency component during being concerned with, and finally obtains the I/Q after having removed carrier frequency
Component.Logic unit of sentencing firmly in reception system respectively obtains the progress level judgement of I/Q two paths of signals to realize demapping
Call sign information.Gray decodes (or differential decoding) module and recovers original bit information from the symbolic information again.
Present inventor has found that common digital QAM has 4-QAM, 16-QAM, 64- in long-term R&D process
The more modulations such as QAM type (order of modulation), show be then on planisphere different points mapping.Order of modulation is higher, often
The information content that a symbolic point carries is bigger.Increase constellation point in the case where the average energy of planisphere remains unchanged, then constellation
The density of figure will increase, and the distance between constellation point becomes smaller, i.e. QAM modulation order is higher, and the distance between constellation point is smaller.That
Sentence link firmly in demodulating process, for different modulation types, selected level decision threshold is also required to different from.
Under normal conditions, it sends, in reception system, if impunity is first arranged, receiver is can not rapidly, accurately to select and transmitter tune
The demodulation mode that type processed matches.
Summary of the invention
The application mainly solving the technical problems that provide a kind of recognition methods of quadrature amplitude modulation type, receiver and
Transmitter can be improved the accuracy and real-time of receiver Adaptive matching demodulation modes.
In order to solve the above technical problems, the technical solution that the application uses is: providing a kind of quadrature amplitude modulation class
The recognition methods of type, the method includes receiving signal of communication；Judge whether signal of communication is id signal；If signal of communication is
Id signal then parses id signal, obtains modulation type corresponding to id signal；Use the solution to match with modulation type
Mode transfer formula demodulates the subsequent useful signal of id signal.
In order to solve the above technical problems, another technical solution that the application uses is: a kind of receiver is provided, it is described to connect
Receipts machine includes demodulated equipment, id signal detector and analog-digital converter, and demodulated equipment couples id signal detector and modulus
Converter, analog-digital converter are separately input into mark after signal of communication is converted to digital signal for receiving signal of communication
Signal detector and demodulated equipment；Id signal detector is believed for judging whether signal of communication is id signal, and in communication
When number being id signal, for parsing id signal, modulation type corresponding to id signal is obtained；Demodulated equipment is for using
The subsequent useful signal of id signal is demodulated with the demodulation modes that modulation type matches.
In order to solve the above technical problems, another technical solution that the application uses is: providing a kind of transmitter, the hair
Sending machine includes modulating equipment, identification signal generator and digital analog converter, and modulating equipment couples id signal detector and digital-to-analogue
Converter；Useful signal is input to digital analog converter for generating useful signal by modulating equipment；Identification signal generator is used
In generation id signal, and id signal is input to digital analog converter；Digital analog converter is used to believe useful signal or mark
It is exported after number being converted to analog signal.
The beneficial effect of the application is: being in contrast to the prior art, method provided herein is receiving
The determination for just completing demodulation modes before effect signal by id signal can be direct after receiving useful signal
It is demodulated using matched demodulation modes, realizes the Adaptive matching of demodulation modes.By receiving effective letter
The determination that demodulation modes are completed before number, can be improved the real-time and accuracy of receiver Adaptive matching demodulation modes.Together
When, the modulation type of useful signal, arithmetic logic can quickly be known by only needing to parse identification marking signal in this method
Simply, system occupancy resource is small, can reduce calculation resources and design complexities, improves operation efficiency, and promoting chip can realize
Property, it is easy to engineering construction.
Detailed description of the invention
Fig. 1 is the flow diagram of the recognition methods first embodiment of the application quadrature amplitude modulation type；
Fig. 2 is the structural schematic diagram of the application receiver first embodiment；
Fig. 3 is the structural schematic diagram of the application transmitter first embodiment；
Fig. 4 is the schematic diagram of the application communications applications system first embodiment；
Fig. 5 is the schematic diagram of the application signal of communication first embodiment；
Fig. 6 is the schematic diagram of the application signal of communication second embodiment；
Fig. 7 is the flow diagram of the recognition methods second embodiment of the application quadrature amplitude modulation type；
Fig. 8 is the equivalent structure schematic diagram of the application Goertzel algorithm；
Fig. 9 is the application Goertzel detection energy variation trend schematic diagram.
Specific embodiment
It is right as follows in conjunction with drawings and embodiments to keep the purpose, technical solution and effect of the application clearer, clear
The application is further described.
The application provides a kind of recognition methods of quadrature amplitude modulation type, is applicable to modulate M-ary Quadrature Amplitude
The processing of (Multiple Quadrature Amplitude Modulation, MQAM) signal.Referring to Fig. 1, Fig. 1 is this Shen
Please quadrature amplitude modulation type recognition methods first embodiment flow diagram.In the embodiment, quadrature amplitude tune
The recognition methods of type processed includes the following steps:
S101: signal of communication is received.
Wherein, signal of communication can be useful signal or id signal, and useful signal is the load for carrying effective information content
Wave signal, id signal are used to identify the modulation type of useful signal, are generally used for identifying the modulation type of latter useful signal.
Generator terminal is being sent, an id signal can sent, first before sending useful signal for identifying the modulation of the useful signal
Type.
S102: judge whether signal of communication is id signal.
Receiver can not determine that received signal is id signal or useful signal, need connecing when receiving signal
Signal is received later to identify signal type.
S103: if signal of communication is id signal, id signal is parsed, obtains modulation class corresponding to id signal
Type.
For id signal for identifying modulation type, i.e., different id signals can correspond to different modulation types.It can be
A kind of id signal corresponds to a kind of modulation type, is also possible to a variety of id signals and corresponds to same modulation type.Pass through parsing
Identification marking signal, being capable of recognition and verification modulation type.
S104: the subsequent useful signal of id signal is demodulated using the demodulation modes to match with modulation type.
In the embodiment, receiver just completes solution mode transfer by id signal before receiving useful signal
The determination of formula sets the demodulation modes to match with the modulation type of useful signal for demodulation modes.Make receiver
It after receiving useful signal, can directly be demodulated using matched demodulation modes, realize receiver to demodulation
The Adaptive matching of mode.And in this method, the determination of demodulation modes, Neng Gouti are just completed before receiving useful signal
The real-time and accuracy of high receiver Adaptive matching demodulation modes.Meanwhile relative to clustering algorithm, only needed in this method
Parsing identification marking signal can quickly know the modulation type of useful signal, and arithmetic logic is simple, and system occupies resource
It is small, it can reduce calculation resources and design complexities, improve operation efficiency, promote chip realizability, be easy to engineering construction.
Based on this, the application provides a kind of receiver, referring to Fig. 2, Fig. 2 is the application receiver first embodiment
Structural schematic diagram.In this embodiment, receiver 20 includes demodulated equipment 201, id signal detector 202 and analog-to-digital conversion
Device 203, wherein analog-digital converter 203 inputs after signal of communication is converted to digital signal respectively for receiving signal of communication
To id signal detector 202 and demodulated equipment 201.Id signal detector 202 is for judging whether signal of communication is mark
Signal, and when signal of communication is id signal, for parsing id signal, obtain modulation type corresponding to id signal.
Demodulated equipment 201 is used to demodulate the subsequent useful signal of id signal using the demodulation modes to match with modulation type.Specifically
Realization process please refers to the description of following embodiments.Receiver provided herein before receiving useful signal just
Completed the determination of demodulation modes by id signal, make receiver after receiving useful signal, can directly use with
The demodulation modes to match demodulated, realize receiver to the Adaptive matchings of demodulation modes.And it can be improved receiver
The real-time and accuracy of Adaptive matching demodulation modes reduce calculation resources and design complexities, improve operation efficiency, are promoted
Chip realizability.
Similarly, the application also provides a kind of transmitter, referring to Fig. 3, Fig. 3 is the application transmitter first embodiment
Structural schematic diagram.In this embodiment, transmitter 30 turns including modulating equipment 301, identification signal generator 302 and digital-to-analogue
Parallel operation 303.Useful signal is input to digital analog converter 303 for generating useful signal by modulating equipment 301；Id signal
Id signal is input to digital analog converter 303 for generating id signal by generator 302；Digital analog converter 303 is used for will
Useful signal or id signal export after being converted to analog signal.Specific implementation process please refers to the description of following embodiments.
Transmitter provided herein can generate id signal, in order to which receiver utilizes the id signal to the tune of useful signal
Type processed is identified.
In one embodiment, id signal is the unloaded wave of single-frequency.In the embodiment, identification signal generator
It is sky carrier detector for unloaded wave producer, id signal detector, accordingly, the application also provides a kind of communications applications system
System, is the schematic diagram of the application communications applications system first embodiment referring specifically to Fig. 4, Fig. 4.In the communications applications system
In, the modem procedue of signal of communication is as follows:
Modulated useful signal is input to digital analog converter (Digital to Analog by MQAM modulating equipment 401
Converter, DAC) 403；The unloaded wave of the single-frequency of generation is also input to DAC by unloaded wave producer 402；DAC selection
The output useful signal or id signal of property.
Specifically, the mapping table of unloaded wave frequency rate and modulation type is pre-established, and the mapping table is distinguished
It is stored in receiver and transmitter.The unloaded wave of different frequency corresponds to different modulation types, can be a kind of sky of frequency
Carrier wave corresponds to a kind of modulation type, and the unloaded wave for being also possible to multiple and different frequencies corresponds to same modulation type.If frequency is f
The corresponding modulation type of unloaded wave that the 2 corresponding modulation type of unloaded wave is 16-QAM, frequency is f 3 is 64-QAM, frequency
It is also 64-QAM for the corresponding modulation type of unloaded wave of f 4.
DAC is before exporting useful signal, according to the modulation type of useful signal, first exports one section and the modulation type phase
Corresponding zero load wave；Then useful signal is exported again.Wherein, unloaded wave can be regular length or persistence length, please specifically join
Fig. 5 and Fig. 6 are read, Fig. 5 is the schematic diagram of the application signal of communication first embodiment, and Fig. 6 is that the application signal of communication second is real
Apply the schematic diagram of mode.
In the embodiment illustrated in figure 5, unloaded wave is regular length, i.e., the persistence length of unloaded wave is fixed value.It is this
Under mode, and though the time interval between two neighboring useful signal be how long, the persistence length of unloaded wave is fixed, such as
It can be 200ms, specific duration is subject to detector and is able to detect identification, it is not limited here.At this point, if two neighboring effective
Time interval between signal is greater than the length of unloaded wave, then can have certain free time, i.e., previous useful signal and latter mark
Know and may exist the free time between signal.The embodiment can reduce the performance consumption of transmitter and receiver, but may
Because unloaded wave is too short, receiving time is missed, causes promptly and accurately to know modulation type.
In embodiment shown in Fig. 6, unloaded wave is persistence length, persistence length be equal to two neighboring useful signal it
Between time interval.I.e. after exporting previous useful signal, sky corresponding with latter useful signal modulation type is exported immediately
Carrier wave, and the zero load wave need to continue to latter useful signal to issue.That is DAC is on the basis for knowing latter useful signal modulation type
On, can after exporting previous useful signal direct output no-load wave, without the free time between two such signal.The embodiment
In, unloaded wave is filled up completely between two neighboring useful signal, the unloaded wave duration is long, can be improved judgment accuracy.But
If being that time interval between two neighboring useful signal is too long, continuing output no-load wave will increase the property of transmitter and receiver
It can consumption.Can as the case may be, adaptability selects the persistence length of unloaded wave.
Wherein, id signal (such as unloaded wave) and useful signal are in identical frequency range, i.e., id signal is (such as zero load
Wave) frequency should be filtered near the frequency of useful signal to prevent stop signal frequency difference is excessive, cause receiver without
Method normally receives id signal (such as unloaded wave).
DAC exports useful signal or id signal to transmission medium (such as cable), is connect using some transmission medium
Receipts machine.
Receiver after receiving signal of communication, using analog-digital converter (Analog to Digital Converter,
ADC) 503 signal of communication is converted into digital signal after be separately input into sky carrier detector 502 and MQAM demodulated equipment 501.
Empty carrier detector 502 can carry out unloaded wave frequency rate detection to the signal received, to confirm modulation type；MQAM demodulated equipment
501 the demodulation modes to match with modulation type can be used to demodulate the useful signal received, obtain the communication information.Please refer to figure
7, Fig. 7 be the flow diagram of the recognition methods second embodiment of the application quadrature amplitude modulation type.Preferably
In, the recognition methods of quadrature amplitude modulation type includes the following steps:
S701: signal of communication is received.
S702: signal of communication and multiple relevant detection coefficients are subjected to frequency coherence operation, obtain multiple coherent values.
Wherein, Goertzel algorithm is selected, respectively with the relevant detection of difference corresponding to all possible unloaded wave frequency rate
Coefficient concurrently carries out frequency selectivity coherent computing to signal of communication.Specifically, Goertzel algorithm is substantially a second order
Filter, equivalent structure is as shown in figure 8, Fig. 8 is the equivalent structure schematic diagram of the application Goertzel algorithm.Wherein x (n) is
Input signal, N are Goertzel detection window depth, and the detection coefficient of different frequency is determined by k,Wherein fexp
For the frequency of expectation search, fadcFor the sample frequency for receiving signal (signal of communication received).It is counted using formula (1)~(3)
Calculate coherent value:
Qk(- 1)=Qk(- 2)=0, n=0,1,2 ..., N (1)
Coherent value | X (k) |2Characterization is frequency input signal finWith expected frequency fexpBetween frequency coherence degree.fin
With fexpNearer it is to then coherent value is higher.Referring to Fig. 9, Fig. 9 is the application Goertzel detection energy variation trend signal
Figure.Fig. 9 shows one and is typically concerned in detection process, what coherent value changed with the presence and disappearance of the hollow carrier wave of signal
Tendency chart.
S703: judge whether highest coherent value is greater than or equal to default coherent value.
Wherein, the highest coherent value of numerical value in multiple coherent values is chosen as highest coherent value.Because of close frequencies
Signal of communication can be concerned with, only degree of coherence is different, therefore, should be concerned with simultaneously with multiple relevant detection coefficients
Operation.And choose coherent value highest one and be compared with default coherent value, that is, choose the highest expected frequency of degree of coherence
It is compared.The selection of default coherent value can efficiently differentiate unloaded wave frequency rate and adjacent other unloaded wave frequency rates to meet system
Subject to.
If highest coherent value is greater than or equal to default coherent value, then it represents that include the relevant detection system of the group in current demand signal
The unloaded wave of the corresponding frequency of number, i.e. judgement signal of communication is id signal.When determining signal of communication for unloaded wave, step is executed
Rapid S704: using the mapping relations of unloaded wave frequency rate and modulation type, modulation type is determined.
After determining modulation type, empty carrier detector 502 can send to MQAM demodulated equipment 501 and carry modulation type
Notice or control instruction complete the adaptive of demodulation modes so that MQAM demodulated equipment 501 determines the demodulation modes for needing selection
Matching process.Specifically, MQAM demodulated equipment 501 is after receiving modulation type, judge current demodulated mode whether with modulation
Type matches, if mismatching, switches to the demodulation modes to match with modulation type.And then to match with modulation type
Demodulation modes demodulate the unloaded subsequent useful signal of wave.
If highest coherent value is less than default coherent value, show not including any one group of zero load wave in current Received Signal,
Empty carrier detector 502 can send the notice or control instruction for not determining modulation type to MQAM demodulated equipment 501.
If unloaded wave is not detected, S705 is thened follow the steps: further judging whether signal of communication is useful signal.Specifically
Ground, to receive signal carry out amplitude energy statistics, obtain the amplitude energy of signal of communication, and judge amplitude energy whether be greater than or
Equal to default amplitude energy value.The selection of default amplitude energy value is can correctly distinguish normal signal and transmission medium white noise
For foundation.
If amplitude energy is greater than or equal to default amplitude energy value, illustrate current demand signal not and be that the bottom of transmission medium is made an uproar,
So receiving signal may be in MQAM useful signal region, that is, determine the signal for useful signal.This may be to connect
Receipts machine misses unloaded wave receiving time window, or due to certain abnormal cause (as unloaded wave is filtered), and fails just
Really detect unloaded wave.
If it is determined that signal of communication be useful signal, then follow the steps S706: in a manner of poll from low order demodulation modes to
High-order demodulation modes are successively matched with useful signal, until successful match, obtains the modulation type of useful signal.Wherein
It is to refer to indicating with constellation point error convergence curve.And then the useful signal is demodulated with the demodulation modes of institute's successful match.
If amplitude energy is less than default amplitude energy value, illustrate that current demand signal may be that the bottom of transmission medium is made an uproar.It is unloaded
Wave detector 502 then has been at unloaded wave searching and detecting state, such circulating repetition above-mentioned steps.
In other embodiments, id signal can also be other signals, such as spread-spectrum signal, touch-tone signal, two
Some identifications such as system amplitude-shift keying signal or the carrier signal for carrying modulation type identification information are simple, detection sensitivity is high
Signal.
If id signal is spread-spectrum signal (chirp), identification signal generator is chirp signal modulation equipment, corresponding
Id signal detector be chirp signal demodulating apparatus；If id signal is touch-tone signal (Dual-tone Multi-
Frequency, DTMF), then identification signal generator is dtmf signal modulating equipment, and corresponding id signal detector is DTMF
Signal demodulating apparatus；If id signal is binary system amplitude-shift keying signal (On-Off Keying, OOK), then id signal occurs
Device is OOK signal modulation equipment, and corresponding id signal detector is OOK signal demodulating apparatus.
If id signal is the carrier signal for carrying modulation type identification information, identification signal generator is the second modulation
Equipment, and set and id signal is generated with default modulation；Id signal detector is the second demodulated equipment, and is set
Signal of communication is demodulated with constant default demodulation modes, default demodulation modes match with default modulation type.In the embodiment party
In formula, after id signal detector receives signal of communication, first matched with default demodulation modes with signal of communication, if
With success, then determines that signal of communication for id signal, demodulates id signal, obtain identification information, determine modulation type.If matching
It is unsuccessful, then illustrate that the signal of communication is not id signal, then further judges whether signal of communication is useful signal, specifically sentence
Disconnected process please refers to the description of above embodiment, and details are not described herein.
Above scheme, the recognition methods of quadrature amplitude modulation type provided herein, by being sent in MQAM signal
It is preceding or send and add id signal in interval, so that receiver is determined demodulation modes by carrying out detection identification to the id signal,
To realize the Adaptive matching of receiving system.This method replaces planisphere clustering to calculate with mature and stable single-tone detection
Method significantly reduces calculation resources and design complexities, improves chip realizability.Unloaded wave detection is using warp simultaneously
The frequency coherence algorithm of allusion quotation, noise margin and detection sensitivity are much higher than the detection to MQAM signal.Therefore, it greatly improves
The Detection accuracy of receiver.And before the transmission of MQAM useful signal, receiver has just completed the locking of demodulation modes, because
This has been obviously improved the real-time of receiver Adaptive matching.
The foregoing is merely presently filed embodiments, are not intended to limit the scope of the patents of the application, all to utilize this
Equivalent structure or equivalent flow shift made by application specification and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field similarly includes in the scope of patent protection of the application.
Claims (13)
1. a kind of recognition methods of quadrature amplitude modulation type, which is characterized in that the described method includes:
Receive signal of communication；
Judge whether the signal of communication is id signal；
If the signal of communication is id signal, the id signal is parsed, modulation corresponding to the id signal is obtained
Type；
The subsequent useful signal of id signal is demodulated using the demodulation modes to match with the modulation type.
2. the recognition methods of quadrature amplitude modulation type according to claim 1, which is characterized in that the id signal is
The unloaded wave of single-frequency.
3. the recognition methods of quadrature amplitude modulation type according to claim 2, which is characterized in that the judgement communication letter
It number whether is that id signal includes:
The signal of communication and multiple relevant detection coefficients are subjected to frequency coherence operation, obtain multiple coherent values；
The highest coherent value of numerical value in the multiple coherent value is chosen as highest coherent value, judges the highest coherent value
Whether default coherent value is greater than or equal to；
If the highest coherent value is greater than or equal to the default coherent value, determine the signal of communication for unloaded wave.
4. the recognition methods of quadrature amplitude modulation type according to claim 3, which is characterized in that the parsing mark letter
Number, obtaining modulation type corresponding to the useful signal includes:
Using the mapping relations of unloaded wave frequency rate and modulation type, modulation type is determined；Wherein, the frequency of the unloaded wave be with
Frequency corresponding to the most relevant detection coefficient, the most relevant detection coefficient are and phase corresponding to the highest coherent value
Dry detection coefficient.
5. the recognition methods of quadrature amplitude modulation type according to claim 3, which is characterized in that described by signal of communication
Frequency coherence operation is carried out with multiple relevant detection coefficients, obtaining multiple coherent values includes:
The signal of communication and multiple relevant detection coefficients are subjected to frequency coherence operation using Goertzel algorithm, obtained described
Multiple coherent values.
6. the recognition methods of quadrature amplitude modulation type according to claim 3, which is characterized in that if the highest is relevant
Value is less than the default coherent value, then further judges whether the signal of communication is useful signal；
It is described to judge whether signal of communication is that useful signal includes:
Amplitude energy statistics are carried out to the signal of communication, obtain the amplitude energy of the signal of communication, and judge the amplitude
Whether energy is greater than or equal to default amplitude energy value；
If the amplitude energy is greater than or equal to the default amplitude energy value, determine the signal of communication for useful signal.
7. the recognition methods of quadrature amplitude modulation type according to claim 6, which is characterized in that if the signal of communication
For useful signal, then successively carried out with the useful signal in a manner of poll from low order demodulation modes to high-order demodulation modes
Match, until successful match, obtains the modulation type of the useful signal.
8. the recognition methods of quadrature amplitude modulation type according to claim 2, which is characterized in that the zero load wave is held
Continuous length is equal to the time interval between two neighboring useful signal for the persistence length of fixed value or the empty carrier signal.
9. the recognition methods of quadrature amplitude modulation type according to claim 1, which is characterized in that the id signal is
Spread-spectrum signal, touch-tone signal, binary system amplitude-shift keying signal or the carrier signal for carrying modulation type identification information.
10. the recognition methods of quadrature amplitude modulation type according to claim 1, which is characterized in that the id signal
With the useful signal in identical frequency range.
11. the recognition methods of quadrature amplitude modulation type according to claim 1, which is characterized in that described in the acquisition
After modulation type corresponding to id signal further include:
Judge whether the demodulation modes of demodulated equipment match with the modulation type；
If mismatching, controls the demodulated equipment and switch to the demodulation modes to match with the modulation type.
12. a kind of receiver, which is characterized in that the receiver includes demodulated equipment, id signal detector and analog-to-digital conversion
Device, the demodulated equipment couple the id signal detector and analog-digital converter；
The analog-digital converter is separately input into after the signal of communication is converted to digital signal for receiving signal of communication
The id signal detector and demodulated equipment；
The id signal detector is mark for judging whether the signal of communication is id signal, and in the signal of communication
When knowing signal, for parsing the id signal, modulation type corresponding to the id signal is obtained；
The demodulated equipment is used to demodulate the id signal using the demodulation modes to match with the modulation type subsequent
Useful signal.
13. a kind of transmitter, which is characterized in that the transmitter includes modulating equipment, identification signal generator and digital-to-analogue conversion
Device, the modulating equipment couple the id signal detector and digital analog converter；
The useful signal is input to the digital analog converter for generating useful signal by the modulating equipment；
The id signal is input to the digital analog converter for generating id signal by the identification signal generator；
The digital analog converter after the useful signal or the id signal are converted to analog signal for exporting.
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