CN110300079A - A kind of msk signal coherent demodulation method and system - Google Patents
A kind of msk signal coherent demodulation method and system Download PDFInfo
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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
- H04L27/1525—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 using quadrature demodulation
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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
- H04L27/156—Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width
- H04L27/1566—Demodulator circuits; Receiver circuits with demodulation using temporal properties of the received signal, e.g. detecting pulse width using synchronous sampling
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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
- H04L27/16—Frequency regulation arrangements
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Abstract
A kind of msk signal coherent demodulation method disclosed by the invention, belongs to wireless communication technology field.Implementation method of the present invention are as follows: the digital baseband complex signal for first obtaining quadrature frequency conversion after reception signal sampling is respectively+1/4T with frequencybWith -1/4TbMultiple sine wave be multiplied, wherein TbIndicate symbol intervals, obtained two paths of signals is respectively 2T with widthbRectangular window do convolution, then pass sequentially through sign synchronization module, frequency compensation module and carrier synchronization module；Sign synchronization module enables signals to quickly enter lock for extracting optimum sampling point, frequency compensation module for compensating a part of frequency deviation, and carrier synchronization module is for restoring and peeling off residual frequency deviation and skew；Finally two paths of signals is taken respectively real part mutually sum it up to subtract each other and adjudicate to obtain the road I and Q circuit-switched data, it is a circuit-switched data by I circuit-switched data, Q circuit-switched data parallel-serial conversion, one circuit-switched data is obtained solution adjusting data, that is, completes the digital MSK coherent demodulation for being suitable for burst communication mode.
Description
Technical field
The present invention relates to a kind of msk signal coherent demodulation methods, belong to wireless communication technology field.
Background technique
Under special despatch environment, equipment power dissipation, antenna size are limited, in order to make full use of booster output, need to select
Select constant enveloped modulation mode.MSK (Minimum Shift Keying, minimum frequency shift keying) be a kind of constant enveloped modulation mode simultaneously
And signal phase is continuous, side lobe attenuation is fast, smaller to adjacent-channel interference compared with BPSK and QPSK.MSK use is to pole symbol
Waveform shape, with ± cos (π t/2Tb) and ± sin (π t/2Tb) in 2TbTwo quadrature components of internal modulation carrier wave are spaced, wherein
TbIndicate symbol intervals.Therefore restore data from I component and Q component according to matched filter is independent, then the mistake of MSK
Code rate performance is identical as the PSK through coherent reception.
Two class of coherent demodulation and non-coherent demodulation can be divided into for the demodulation method of msk signal.Coherent demodulation needs to carry
Wave is synchronous to go out carrier phase with Exact recovery, and complexity is higher compared with non-coherent demodulation, but can obtain better error code
Rate performance.In coherent demodulation method, carrier synchronization is usually realized by phaselocked loop.Phaselocked loop uses negative feedback structure, including
Three phase discriminator, loop filter, oscillator parts.Phase discriminator will input the signal phase and oscillator output signal of phaselocked loop
Phase be compared, and the error two signals is filtered using loop filter, the output of loop filter by with
Make control signal feeding oscillator to be finally reached to reduce the phase error between pll output signal and input signal
Stable state realizes the carrier auxiliary of receiving end.Other than carrier synchronization, also need sign synchronization to extract in coherent demodulation
The optimum sampling point of each symbol.A kind of symbol timing synchronization method that Gardner is proposed does not need adjustment sampling instant, but sharp
Optimum sampling point is fitted with the signal interpolation after sampling, is suitably applied digital communication system.
Summary of the invention
A kind of the purpose of msk signal coherent demodulation method disclosed by the invention, is: providing one kind in large doppler offset frequency situation
Under can quickly enter lock, suitable for the digital MSK coherent demodulation method of burst communication mode, there is high sensitivity, the bit error rate
Low advantage.
The purpose of the present invention is what is be achieved through the following technical solutions.
A kind of msk signal coherent demodulation method disclosed by the invention: quadrature frequency conversion obtains after receiving signal sampling first
The digital baseband complex signal arrived is respectively+1/4T with frequencybWith -1/4TbMultiple sine wave be multiplied, wherein TbIndicate symbol intervals,
Obtained two paths of signals is respectively 2T with widthbRectangular window do convolution, then pass sequentially through sign synchronization module, frequency compensation
Module and carrier synchronization module.Sign synchronization module is for extracting optimum sampling point, and frequency compensation module is for compensating one
Frequency dividing enables signals to quickly enter lock partially, and carrier synchronization module is for restoring and peeling off residual frequency deviation and skew.Finally by two
Road signal takes real part mutually to sum it up to subtract each other and adjudicate to obtain the road I and Q circuit-switched data, be by I circuit-switched data, Q circuit-switched data parallel-serial conversion respectively
One circuit-switched data, a circuit-switched data are obtained solution adjusting data, that is, complete the digital MSK phase for being suitable for burst communication mode
Dry demodulation.
A kind of msk signal coherent demodulation method disclosed by the invention, includes the following steps:
It is denoted as x (n) Step 1: docking quadrature frequency conversion after receipts signal sampling and obtaining digital baseband complex signal, by this signal
It is respectively+1/4T with locally generated frequencybWith -1/4TbDiscrete multiple sine wave be multiplied, obtain two paths of signals and be expressed asWithWherein TbIndicate symbol intervals, TsIndicate the sampling interval.And it will obtain
Two paths of signals carries out matched filtering respectively.Definition is+1/4T with frequencybDiscrete multiple sine after signal be that upper branch is believed
Number, definition is -1/4T with frequencybDiscrete multiple sine after signal be lower tributary signal.
Two paths of signals described in step 1 carries out matched filtering respectively and passes through the two paths of signals that will be obtained and width as 2TbSquare
Shape window does convolution, or is 2T to obtained two paths of signalsbTime integral is realized.
Step 2: the two paths of signals after matched filtering inputs sign synchronization module respectively.Sign synchronization module uses
Negative feedback structure makes one optimum sampling point of output in each mark space be sent into carrier synchronization module.
Preferably, the negative feedback structure that negative feedback structure described in step 2 selects Gardner to propose.
Step 3: by sign synchronization module export signal square, to square after signal be FFT and take amplitude find peak
Value regard peak point respective frequencies value as offset estimation value divided by two, then takes opposite number to offset estimation value and as frequency
Rate generates the signal multiplication of multiple sinusoidal signal and sign synchronization module output to realize frequency compensation.
Step 4: by after frequency compensation wherein signal does a square processing and is then fed into phaselocked loop all the way, finally by locking phase
Ring exports the output of the road signal two divided-frequency as carrier synchronization module, is multiplied to respectively with two tributary signals after frequency compensation
Remove frequency deviation skew.
Step 5: for having peeled off frequency deviation two tributary signals mutually to the rear, upper branch is expressed asLower branch can be expressed asIts
Middle s (t)=pk cos(πt/2Tb)+jqk sin(πt/2Tb), pkAnd qkRespectively indicate the road I and Q circuit-switched data.Upper branch and lower branch
Road takes real part to be added to obtainIt extracts i.e. every a point in (2k+1) TbMoment is extracted and adjudicates
Obtain I circuit-switched data；Upper branch takes real part to subtract each other to obtain with lower branchAfter postponing a point
It extracts i.e. every a point in (2k+2) TbMoment, which is extracted and adjudicates, obtains Q circuit-switched data.By I circuit-switched data, Q circuit-switched data parallel-serial conversion
For a circuit-switched data, a circuit-switched data is to solve adjusting data, that is, completes the relevant solution of digital MSK for being suitable for burst communication mode
It adjusts.
Decision method described in step 5 are as follows: zero passage judgement, signal are greater than 0 and are judged to 1, and signal is judged to 0 less than 0, or
Person in contrast, depending on modulation when mapping relations depending on.
Invention additionally discloses the msk signal coherent demodulation systems for realizing a kind of msk signal coherent demodulation method
System, including the discrete multiple sine module of positive frequency, negative frequency discrete multiple sine module, two matched filtering modules, two
A sign synchronization module, two frequency compensation modules, a carrier synchronization module, a summation module, subtraction module, one
A parallel serial conversion module.
Quadrature frequency conversion obtains digital baseband complex signal and is denoted as x (n) after signal sampling being received, and the digital baseband is answered
Signal passes through the discrete multiple sine module of positive frequency, two that the discrete multiple sine resume module of negative frequency is obtained respectively
Road signal, is expressed asWithWherein define the discrete multiple sinusoidal phase of positive frequency
The signal for multiplying module output is upper tributary signal, and the signal for defining the discrete multiple sine module output of negative frequency is lower branch letter
Number.
Matched filtering module is used to obtained two paths of signals carrying out matched filtering respectively.Matched filtering is by believing two-way
Number with width be 2TbRectangular window do convolution, or 2T is done to obtained two paths of signalsbTime integral is realized.
Sign synchronization module uses negative feedback structure, and an optimum sampling point feeding is exported in each mark space for making
Carrier synchronization module.Preferably, the negative feedback structure that the negative feedback structure of sign synchronization module selects Gardner to propose.
Frequency compensation module is used for the signal square that exports sign synchronization module, to square after signal be FFT and take
Amplitude finds peak value, regard peak point respective frequencies value as offset estimation value divided by two, then takes opposite number to offset estimation value
And the signal multiplication of multiple sinusoidal signal and sign synchronization module output is generated to realize frequency compensation as frequency.
The upper tributary signal of the discrete multiple sine module output of positive frequency passes sequentially through matched filtering module, sign synchronization
Module, frequency compensation module carry out signal processing, the upper tributary signal after obtaining frequency compensation.
The upper tributary signal of the discrete multiple sine module output of negative frequency passes sequentially through matched filtering module, sign synchronization
Module, frequency compensation module carry out signal processing, the lower tributary signal after obtaining frequency compensation.
Carrier synchronization module be used for by after frequency compensation wherein signal does a square processing and is then fed into phaselocked loop all the way, most
Phaselocked loop is exported into the road signal two divided-frequency as the output of carrier synchronization module, with two tributary signals after frequency compensation point afterwards
Be not multiplied to removing frequency deviation skew to get to removing frequency deviation skew upper tributary signal, lower tributary signal.
For having peeled off frequency deviation two tributary signals mutually to the rear, upper branch is expressed as
Lower branch is expressed asWherein s (t)=pk cos(πt/2Tb)+jqk sin(πt/
2Tb), pkAnd qkRespectively indicate the road I and Q circuit-switched data.
Summation module is used to take real part to be added to obtain with lower tributary signal the upper branch for removing frequency deviation skewThen it is extracted i.e. every a point in (2k+1) T afterbMoment, which is extracted and adjudicates, obtains I number
According to.Subtraction module is used to take real part to subtract each other to obtain upper branch and lower branchThen postpone
It is extracted i.e. every a point in (2k+2) T after one pointbMoment, which is extracted and adjudicates, obtains Q circuit-switched data.
Parallel serial conversion module is used to for I, Q two paths of data being merged into a circuit-switched data, and a circuit-switched data is to be solved
Adjusting data completes the digital MSK coherent demodulation for being suitable for burst communication mode.
The utility model has the advantages that
1, a kind of msk signal coherent demodulation method and system disclosed by the invention pass through the discrete multiple sine of positive frequency
The two paths of signals that module and the discrete multiple sine module of negative frequency obtain carries out matched filtering respectively, then through sign synchronization,
Frequency compensation, then carrier synchronization is carried out, it can be improved MSK coherent demodulation system medium sensitivity.
2, a kind of msk signal coherent demodulation method and system disclosed by the invention, carrier synchronization module will be after frequency compensations
Wherein all the way signal be sent into phaselocked loop, can be realized phaselocked loop under large doppler offset frequency situation quickly enter lock.
3, a kind of msk signal coherent demodulation method and system disclosed by the invention, by wherein believing all the way after frequency compensation
Number be sent into phaselocked loop, phaselocked loop is finally exported into the road signal two divided-frequency as the output of carrier synchronization module, with frequency compensation
Two tributary signals afterwards are multiplied to need two-way in removing frequency deviation skew, with traditional MSK coherent demodulation method carrier synchronization respectively
Phaselocked loop locks two frequencies respectively and compares, and the present invention only needs phaselocked loop all the way, more saving resource.
Detailed description of the invention
A kind of Fig. 1 msk signal coherent demodulation method flow schematic diagram disclosed by the invention；
Fig. 2 is frequency compensation module map.
Fig. 3 is to take amplitude result figure in frequency compensation module after FFT.
Fig. 4 is that carrier synchronization module output signal phase deviation changes over time figure.
Specific embodiment
Objects and advantages in order to better illustrate the present invention with reference to the accompanying drawing do further summary of the invention with example
Explanation.
Embodiment 1:
As shown in Figure 1, a kind of msk signal coherent demodulation method disclosed in the present embodiment, the specific implementation steps are as follows:
Quadrature frequency conversion obtains digital baseband complex signal and is denoted as x (n) after signal sampling being received, and the digital baseband is answered
Signal passes through the discrete multiple sine module of positive frequency, two that the discrete multiple sine resume module of negative frequency is obtained respectively
Road signal, is expressed asWithSpecific conventional letter rate is 40Mbps,
Sample rate is 8 times of character rates.So locally generated value isWithDiscrete multiple sinusoidal sequence and x
(n) it is multiplied.
The signal for wherein defining the discrete multiple sine module output of positive frequency is upper tributary signal, and it is discrete to define negative frequency
The signal of multiple sine module output is lower tributary signal.
Then, matched filtering module is used to obtained two paths of signals carrying out matched filtering respectively.Matched filtering by pair
Two paths of signals and width are 2TbRectangular window do convolution, or 2T is done to obtained two paths of signalsbTime integral is realized.Practical behaviour
Complete 1 sequence for being 16 as signal and length does convolution.
Sign synchronization module uses negative feedback structure, and an optimum sampling point feeding is exported in each mark space for making
Carrier synchronization module.Preferably, the negative feedback structure that the negative feedback structure of sign synchronization module selects Gardner to propose, right
Two paths of signals fits an optimum sampling point in 8 interpolated values of each mark space using known sampled point.By inserting
It is worth the two-way output signal of fitting, is denoted as x1(k) and x2(k), rate is chip rate 40Mbps, and is sent into frequency compensation
Module.
Frequency compensation module is as shown in attached drawing two, signal square for exporting sign synchronization module, to square after
Signal is FFT and amplitude is taken to find peak value, regard peak point respective frequencies value as offset estimation value divided by two, then estimates to frequency deviation
Evaluation takes opposite number and generates the signal multiplication of multiple sinusoidal signal and sign synchronization module output as frequency to realize frequency
Rate compensation.
For the above branch, because of baseband complex signal and discrete multiple sinusoidal sequenceAfter multiplication, signal number frequency
Rate be 0 orEvery the corresponding 8 sampled point phase changes of a symbol be 0 or π, so by x1(k) a square processing is done
To eliminate influence of the modulation intelligence to frequency.Detailed process is as shown in Fig. 2, to x1(k) or x2(k) a square processing is done, then will be put down
Just treated, and signal is FFT and takes amplitude.Assuming that be 512 point FFT, and assume the 2nd point search after the fft to amplitude most
Big value, as shown in Fig. 3.So by x1(k) and x2(k) and sequenceIt is multiplied to realize frequency compensation.
The upper tributary signal of the discrete multiple sine module output of positive frequency passes sequentially through filtering matched filtering module, symbol
Synchronization module, frequency compensation module carry out signal processing, the upper tributary signal after obtaining frequency compensation；
The upper tributary signal of the discrete multiple sine module output of negative frequency passes sequentially through filtering matched filtering module, symbol
Synchronization module, frequency compensation module carry out signal processing, the lower tributary signal after obtaining frequency compensation；
Carrier synchronization module be used for by after frequency compensation wherein signal does a square processing and is then fed into phaselocked loop all the way, most
Phaselocked loop is exported into the road signal two divided-frequency as the output of carrier synchronization module, with two tributary signals after frequency compensation point afterwards
Be not multiplied to removing frequency deviation skew to get to removing frequency deviation skew upper tributary signal, lower tributary signal.Carrier synchronization output letter
Number phase deviation it is as shown in Fig. 4, after 200 symbol times phaselocked loop enter lock.
For having peeled off frequency deviation two tributary signals mutually to the rear, upper branch is expressed as
Lower branch is expressed asWherein s (t)=pk cos(πt/2Tb)+jqk sin(πt/
2Tb), pkAnd qkRespectively indicate the road I and Q circuit-switched data.
Summation module is used to take real part to be added to obtain with lower tributary signal the upper branch for removing frequency deviation skewThen it is extracted i.e. every a point in (2k+1) T afterbMoment, which is extracted and adjudicates, obtains I number
According to.Subtraction module is used to take real part to subtract each other to obtain upper branch and lower branchThen postpone
It is extracted i.e. every a point in (2k+2) T after one pointbMoment, which is extracted and adjudicates, obtains Q circuit-switched data.
Assuming that obtaining I circuit-switched data is [1,1,1,0,1], obtaining Q circuit-switched data is [0,0,1,0,0], and parallel serial conversion module is used
In I, Q two paths of data are merged into a circuit-switched data, i.e., [1,0,1,0,1,1,0,0,1,0].One circuit-switched data is to obtain
Adjusting data is solved, that is, completes the digital MSK coherent demodulation for being suitable for burst communication mode.
Above-described specific descriptions have carried out further specifically the purpose of invention, technical scheme and beneficial effects
It is bright, it should be understood that the above is only a specific embodiment of the present invention, the protection model being not intended to limit the present invention
It encloses, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection scope within.
Claims (5)
1. a kind of msk signal coherent demodulation method, it is characterised in that: include the following steps,
It is denoted as x (n) Step 1: docking quadrature frequency conversion after receipts signal sampling and obtaining digital baseband complex signal, this signal is distinguished
It is+1/4T with locally generated frequencybWith -1/4TbDiscrete multiple sine wave be multiplied, obtain two paths of signals and be expressed asWithWherein TbIndicate symbol intervals, TsIndicate the sampling interval；And it will obtain
Two paths of signals carries out matched filtering respectively；Definition is+1/4T with frequencybDiscrete multiple sine after signal be that upper branch is believed
Number, definition is -1/4T with frequencybDiscrete multiple sine after signal be lower tributary signal；
Step 2: the two paths of signals after matched filtering inputs sign synchronization module respectively；Sign synchronization module is using negative anti-
Structure is presented, one optimum sampling point of output in each mark space is made to be sent into carrier synchronization module；
Step 3: by sign synchronization module export signal square, to square after signal be FFT and take amplitude find peak value,
Peak point respective frequencies value is regard as offset estimation value divided by two, opposite number then is taken to offset estimation value and produce as frequency
Raw multiple sinusoidal signal and the signal multiplication of sign synchronization module output are to realize frequency compensation；
Step 4: by after frequency compensation wherein signal does a square processing and is then fed into phaselocked loop all the way, it is finally that phaselocked loop is defeated
Output of the road the Chu Gai signal two divided-frequency as carrier synchronization module, is multiplied to remove respectively with two tributary signals after frequency compensation
Frequency deviation skew；
Step 5: for having peeled off frequency deviation two tributary signals mutually to the rear, upper branch is expressed asLower branch can be expressed asIts
Middle s (t)=pk cos(πt/2Tb)+jqk sin(πt/2Tb), pkAnd qkRespectively indicate the road I and Q circuit-switched data；Upper branch and lower branch
Road takes real part to be added to obtainIt extracts i.e. every a point in (2k+1) TbMoment is extracted and adjudicates
Obtain I circuit-switched data；Upper branch takes real part to subtract each other to obtain with lower branchAfter postponing a point
It extracts i.e. every a point in (2k+2) TbMoment, which is extracted and adjudicates, obtains Q circuit-switched data；By I circuit-switched data, Q circuit-switched data parallel-serial conversion
For a circuit-switched data, a circuit-switched data is to solve adjusting data, that is, completes the relevant solution of digital MSK for being suitable for burst communication mode
It adjusts.
2. a kind of msk signal coherent demodulation method as described in claim 1, it is characterised in that: two paths of signals described in step 1
Matched filtering is carried out respectively passes through the two paths of signals that will be obtained and width as 2TbRectangular window do convolution, or to two obtained
Road signal is 2TbTime integral is realized.
3. a kind of msk signal coherent demodulation method as claimed in claim 1 or 2, it is characterised in that: negative-feedback described in step 2
The negative feedback structure that structure selects Gardner to propose.
4. a kind of msk signal coherent demodulation method as claimed in claim 3, it is characterised in that: judgement side described in step 5
Method is zero passage judgement, and signal is greater than 0 and is judged to 1, and signal is judged to 0 less than 0, or in contrast, depending on mapping relations when modulation
Depending on.
5.MSK signal coherence demodulating system, for realizing a kind of msk signal coherent demodulation method, it is characterised in that: packet
Include the discrete multiple sine module of positive frequency, negative frequency discrete multiple sine module, two matched filtering modules, two symbols
Synchronization module, a carrier synchronization module, a summation module, a subtraction module, one and is gone here and there at two frequency compensation modules
Conversion module；
Quadrature frequency conversion obtains digital baseband complex signal and is denoted as x (n) after signal sampling being received, by the digital baseband complex signal
Believed respectively by the two-way that the discrete multiple sine module of positive frequency, the discrete multiple sine resume module of negative frequency are obtained
Number, it is expressed asWithWherein define the discrete multiple sine mould of positive frequency
The signal of block output is upper tributary signal, and the signal for defining the discrete multiple sine module output of negative frequency is lower tributary signal；
Matched filtering module is used to obtained two paths of signals carrying out matched filtering respectively；Matched filtering by two paths of signals with
Width is 2TbRectangular window do convolution, or 2T is done to obtained two paths of signalsbTime integral is realized；
Sign synchronization module uses negative feedback structure, and an optimum sampling point feeding carrier wave is exported in each mark space for making
Synchronization module；Preferably, the negative feedback structure that the negative feedback structure of sign synchronization module selects Gardner to propose；
Frequency compensation module is used for the signal square that exports sign synchronization module, to square after signal be FFT and take amplitude
Find peak value, by peak point respective frequencies value divided by two be used as offset estimation values, then to offset estimation value take opposite number and with
This generates the signal multiplication of multiple sinusoidal signal and sign synchronization module output for frequency to realize frequency compensation；
The upper tributary signal of the discrete multiple sine module output of positive frequency passes sequentially through matched filtering module, sign synchronization mould
Block, frequency compensation module carry out signal processing, the upper tributary signal after obtaining frequency compensation；
The upper tributary signal of the discrete multiple sine module output of negative frequency passes sequentially through matched filtering module, sign synchronization mould
Block, frequency compensation module carry out signal processing, the lower tributary signal after obtaining frequency compensation；
Carrier synchronization module be used for by after frequency compensation wherein signal does a square processing and is then fed into phaselocked loop all the way, last general
Phaselocked loop exports the output of the road signal two divided-frequency as carrier synchronization module, distinguishes phase with two tributary signals after frequency compensation
Multiplied by removing frequency deviation skew to get to removing frequency deviation skew upper tributary signal, lower tributary signal；
For having peeled off frequency deviation two tributary signals mutually to the rear, upper branch is expressed as
Lower branch is expressed asWherein s (t)=pk cos(πt/2Tb)+jqk sin(πt/
2Tb), pkAnd qkRespectively indicate the road I and Q circuit-switched data；
Summation module is used to take real part to be added to obtain with lower tributary signal the upper branch for removing frequency deviation skewThen it is extracted i.e. every a point in (2k+1) T afterbMoment, which is extracted and adjudicates, obtains I number
According to；Subtraction module is used to take real part to subtract each other to obtain upper branch and lower branchThen postpone
It is extracted i.e. every a point in (2k+2) T after one pointbMoment, which is extracted and adjudicates, obtains Q circuit-switched data；
Parallel serial conversion module is used to for I, Q two paths of data being merged into a circuit-switched data, and a circuit-switched data is to solve adjusting data, i.e., complete
At the digital MSK coherent demodulation for being suitable for burst communication mode.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111585928A (en) * | 2020-04-28 | 2020-08-25 | 中国电子科技集团公司第三研究所 | Voice signal single-sideband modulation and demodulation method and device |
| CN115174326A (en) * | 2022-06-16 | 2022-10-11 | 成都世纪科园电子有限公司 | Burst detection and coherent demodulation device and method for high-speed frequency hopping MSK signal |
| CN115189991A (en) * | 2022-05-20 | 2022-10-14 | 南昌大学 | Device and method for phase modulation synchronous demodulation |
| CN115580515A (en) * | 2022-11-24 | 2023-01-06 | 四川九洲电器集团有限责任公司 | MSK demodulation method, device, equipment and storage medium based on multi-path judgment |
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| CN111585928A (en) * | 2020-04-28 | 2020-08-25 | 中国电子科技集团公司第三研究所 | Voice signal single-sideband modulation and demodulation method and device |
| CN111585928B (en) * | 2020-04-28 | 2023-05-05 | 中国电子科技集团公司第三研究所 | Single sideband modulation and demodulation method and device for voice signal |
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| CN115174326A (en) * | 2022-06-16 | 2022-10-11 | 成都世纪科园电子有限公司 | Burst detection and coherent demodulation device and method for high-speed frequency hopping MSK signal |
| CN115174326B (en) * | 2022-06-16 | 2023-09-22 | 成都世纪科园电子有限公司 | Burst detection and coherent demodulation device and method for high-speed frequency hopping MSK signal |
| CN115580515A (en) * | 2022-11-24 | 2023-01-06 | 四川九洲电器集团有限责任公司 | MSK demodulation method, device, equipment and storage medium based on multi-path judgment |
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