CN102801674A - Incoherent detection method and device of continuous phase modulation signals - Google Patents

Abstract

The invention provides an incoherent detection method of continuous phase modulation signals. The incoherent detection method comprises the following steps of: obtaining a baseband receiving signal after down-conversion; carrying out low-pass filtering treatment on the baseband receiving signal, so as to obtain a first output signal; enabling the first output signal to be related to a delay signal of the first output signal, so as to obtain a second output signal; calculating a compound angle of the second output signal, and outputting a differential phase after multiplying a ratio factor; carrying out matched filtering treatment on the differential phase, so as to obtain a third output signal; sampling the third output signal by using code elements at intervals, so as to obtain an output sequence; carrying out decision feedback balance treatment by the code element on the output sequence; and outputting an estimation value of a transmission sequence. Correspondingly, the invention further provides an incoherent detection device of the continuous phase modulation signals. According to the incoherent detection method and device of the continuous phase modulation signals provided by the invention, the estimation of a sending sequence is obtained by carrying out the matched filtering treatment and the decision feedback balance treatment on the differential phase, so that simple design, easiness in realizing hardware, and good bit error rate property can be achieved on the premise of ensuring a receiving property.

Description

The incoherent detection method and the device of continuous phase modulated signal

Technical field

The present invention relates to the receiver design in the communication system, specifically, the present invention relates to a kind of incoherent detection method and incoherent detection device of continuous phase modulated signal.

Background technology

Continuous Phase Modulation (CPM) signal is one type of modulation signal that permanent envelope phase is continuous; Have higher bandwidth and power utilization; Can use non-linear class C amplifier to carry out radio-frequency transmissions; And have stronger adjacent channel interference resisting capacity, therefore in the portable communications system of arrowband, low-power consumption, obtained extensive use.GMSK Gaussian-filtered minimum shift keying (GMSK) modulation system that in Global Link (GSM) system, is adopted is binary system CPM.For binary system CPM, existing a large amount of achievement in research and multiple demodulation methods can supply to select for use.

In order to improve bandwidth availability ratio, need to adopt the multi-system modulation.Take all factors into consideration the validity and the reliability index of system, adopt the quaternary or octal system CPM form in the real system usually.Multi-system CPM signal has multiple different demodulation method, can be divided into two big types of coherent demodulation and non-coherent demodulations generally.The coherent demodulation method need be extracted carrier phase information, realizes complicated.

And for the lower non-coherent demodulation method of complexity, particularly the non-coherent demodulation method of total regression CPM signal has more achievement in research.But in the practical application,, usually the base band pulse signal is carried out modulating again after the preliminary treatment such as waveform shaping, spectrum control, thereby form various multi-form partial response CPM signals in order further to improve the availability of frequency spectrum.Much be directed against the demodulation method of total regression CPM signal and be not suitable for partial response CPM signal, the non-coherent demodulation of partial response CPM signal adopts the method for Sequence Detection usually, and realizes through viterbi algorithm.But for multi-system partial response CPM signal, the grid chart size in the viterbi algorithm is bigger, need expend more hardware resource, realizes bringing certain difficulty to hardware.Therefore need seek a kind of low complex degree detection method that is applicable to multi-system partial response CPM signal, under the prerequisite that guarantees receptivity, reduce the complexity that hardware is realized.

Summary of the invention

Technical problem to be solved by this invention provides a kind of incoherent detection method and device of continuous phase modulated signal, under the prerequisite that guarantees receptivity, reduces the complexity that hardware is realized.

For solving the problems of the technologies described above, the present invention provides a kind of incoherent detection method of continuous phase modulated signal, comprises step:

A. obtain the baseband receiving signals after down-conversion;

B. said baseband receiving signals is carried out low-pass filtering treatment with the filtering out-of-band noise, obtain the first output signal;

C. the said first output signal and himself inhibit signal are done relevantly, obtained second and export signal;

D. the said second output signal is asked multiple angle, and export differential phase after multiply by scale factor;

E. said differential phase is carried out matched filter processing, obtain the 3rd output signal;

F. said the 3rd output signal is sampled with symbol interval, obtain output sequence;

G. said output sequence is pursued the decision feedback equalization processing of code element, obtain the estimated value of the transfer sequence of interference effect between blanking code;

H. export the estimated value of said transfer sequence.

Alternatively, said step G comprises step:

G1. adopt Zero Forcing to ask for feedforward transversal filter coefficient;

G2. channel impulse response and said feedforward transversal filter coefficient are carried out convolution, ask for feedback transversal filter coefficient;

G3. said output sequence is sent into the feedforward transversal filter by sampling point and carry out Filtering Processing, and the feedback transversal filter is sent in the output of symbol judgement device carried out Filtering Processing;

G4. send into said symbol judgement device with of the output processing of suing for peace of said feedforward transversal filter, and with the result with the feedback transversal filter;

G5. said symbol judgement device pursues symbol judgement according to preset thresholding to said result.

Alternatively, the bandwidth of said low pass filter is set to comprise the signal bandwidth of 99% energy.

Alternatively, Gaussian pulse is shaped said base band, the 4CPM signal of correlation length L=3 in order to adopt.

Alternatively, said preset thresholding comprises-2,0,2 three thresholdings.

Correspondingly, the present invention also provides a kind of incoherent detection device of continuous phase modulated signal, comprising:

The baseband receiving signals acquisition module is used to obtain the baseband receiving signals after down-conversion;

Low pass filter is used for said baseband receiving signals is carried out low-pass filtering treatment, with the filtering out-of-band noise, obtains the first output signal;

Postpone correlator, be used for the said first output signal and himself inhibit signal are done relevant, obtain second and export signal;

The differential phase acquisition module is used for the said second output signal is asked multiple angle, and exports differential phase after multiply by scale factor;

Matched filter is used for said differential phase is carried out matched filter processing, obtains the 3rd output signal;

Sampling module is used for said the 3rd output signal is sampled with symbol interval, obtains output sequence;

DFF is used for said output sequence is pursued the decision feedback equalization processing of code element, obtains the estimated value of the transfer sequence of interference effect between blanking code;

Output module is used to export the estimated value of said transfer sequence.

Alternatively, said DFF comprises:

Feedforward transversal filter coefficient is asked for module, is used to adopt Zero Forcing to ask for said feedforward transversal filter coefficient;

Feedback transversal filter coefficient is asked for module, is used for channel impulse response and said feedforward transversal filter coefficient are carried out convolution, asks for said feedback transversal filter coefficient;

Module is sent in filtering, is used for that said output sequence is sent into the feedforward transversal filter by sampling point and carries out Filtering Processing, and the feedback transversal filter is sent in the output of symbol judgement device carried out Filtering Processing;

Summation module is used for output the sue for peace processing of said feedforward transversal filter with the feedback transversal filter, and the result is sent into said symbol judgement device;

The symbol judgement device is used for according to preset thresholding said result being pursued symbol judgement.

Alternatively, the bandwidth of said low pass filter is set to comprise the signal bandwidth of 99% energy.

Alternatively, Gaussian pulse is shaped said base band, the 4CPM signal of correlation length L=3 in order to adopt.

Alternatively, said preset thresholding comprises-2,0,2 three thresholdings.

Compared with prior art, the present invention has the following advantages:

The present invention handles through the differential phase signal being carried out matched filtering and decision feedback equalization, obtains sending the estimation of sequence.Scheme of the present invention simplicity of design, hardware under the prerequisite that guarantees receptivity are easy to realization, and have error performance preferably, possess better practicability and economy.

Description of drawings

Above-mentioned and other characteristic, character and advantage of the present invention will become more obvious through the description below in conjunction with accompanying drawing and embodiment, wherein:

Fig. 1 is the modular structure sketch map of the incoherent detection device of one embodiment of the invention;

Fig. 2 is the modular structure sketch map of BBP of the incoherent detection device of one embodiment of the invention;

Fig. 3 is the modular structure sketch map of DFF of BBP of the incoherent detection device of one embodiment of the invention;

Fig. 4 is the schematic flow sheet of incoherent detection method of the continuous phase modulated signal of one embodiment of the invention;

Fig. 5 pursues the method schematic flow diagram of the decision feedback equalization processing of code element for one embodiment of the invention to output sequence;

Fig. 6 for the time wide bandwidth of choosing base band Gauss forming filter of one embodiment of the invention long-pending during for BT=1 emulation obtain the error rate under the awgn channel condition;

Fig. 7 for the time wide bandwidth of choosing base band Gauss forming filter of one embodiment of the invention long-pending during for BT=0.5 emulation obtain the error rate under the awgn channel condition.

Embodiment

Below in conjunction with specific embodiment and accompanying drawing the present invention is described further, but should limit protection scope of the present invention with this.

1.CPM signal model

In the present invention, the carrier (boc) modulated signals of CPM can be expressed as:

$s_0\left(t\right)=\sqrt{\frac{2E}{T}}\cos [2\mathrm{\π}{f}_{c}t+\mathrm{\φ}(t,I)+{\mathrm{\φ}}_0]---\left(1\right)$

In formula (1), E is the unit element energy of signal, and T is a code-element period, f _cBe carrier frequency, φ ₀Be the initial phase of carrier wave, φ (it is defined as for t, I) the time covert position of expression carrier wave:

$\mathrm{\φ}(t,I)=2\mathrm{\πh}\underset{k=-\∞}{\overset{n}{\mathrm{\Σ}}}{I}_{k}q(t-\mathrm{kT})---\left(2\right)$

In formula (2), h is a modulation index, { I _kBe by symbol table ± 1, ± 3 ..., ± M metasymbol the sequence selected in (M-1), q (t) is certain normalization waveform.

Waveform q (t) generally can be expressed as the integration of certain base band frequency modulation on pulse g (t), and its expression formula is seen formula (3):

$q\left(t\right)=\left\{\begin{array}{cc}0,& t<0\\ {\&Integral;}_0^{t}g\left(\mathrm{\&tau;}\right)\mathrm{d\&tau;},& 0\&le;t<\mathrm{<figure-callout\; id="1"\; label="LT"\; filenames="HDA0000064010650000011.png"\; state="\{\{state\}\}">LT</figure-callout>}\\ 1/2,& t\&GreaterEqual;\mathrm{LT}\end{array}\right.---\left(3\right)$

In formula (3), g (τ) is the base band frequency modulation on pulse, is [0, LT] between its area of non-zero regions, and L is the frequency modulation on pulse width.During L=1, corresponding CPM signal is complete response signal.L＞1 o'clock, then corresponding CPM signal is a partial response signal.

The CPM baseband modulation signal of equivalence can be expressed as:

$s\left(t\right)=\sqrt{2E/T}\exp \left[\mathrm{j\&phi;}(t,I)\right]---\left(4\right)$

If adopt additive white Gaussian noise (Additive White Gaussian Noise is called for short AWGN) channel model, with the output signal of s (t) expression CPM modulator, then the input signal of demodulator does

r(t)＝s(t)+n(t) (5)

Wherein, n (t) is 0 for average, and variance is σ ²White Gaussian noise.

2. incoherent detection Design of device

The modular structure sketch map of the incoherent detection device of one embodiment of the invention is as shown in Figure 1.As shown in the figure, the incoherent detection device 100 of this continuous phase modulated signal can comprise:

Baseband receiving signals acquisition module 101 is used to obtain the baseband receiving signals r (t) after down-conversion;

Low pass filter 102 is used for baseband receiving signals r (t) is carried out low-pass filtering treatment, with the filtering out-of-band noise, obtains the first output signal x (t), and the bandwidth of this low pass filter 102 can be set to comprise the signal bandwidth of 99% energy;

Postpone correlator 103, be used for the first output signal x (t) and himself inhibit signal (retardation is Δ τ) are done relevant, obtain second and export signal y (t), i.e. y (t)=x (t) x ^*(t-Δ τ);

Differential phase acquisition module 104; Be used for the second output signal y (t) is asked multiple angle, and multiply by scale factor back output differential phase

i.e.

BBP 105 is used for the estimated value based on differential phase signal

output transfer sequence.

Wherein, In order to obtain the linear approximation expression formula of

, suppose satisfying following two conditions:

1) φ _D(t, amplitude I) is less than π.At h, under the given situation of M and q (t), can satisfy this condition through the value of selecting Δ τ.

2) phase change that channel causes in Δ τ is enough little.

Than under the high s/n ratio; In conjunction with above-mentioned two conditions, the linear approximation expression formula that can obtain

is suc as formula shown in (6).

Wherein

p _Δτ(t)＝q(t)-q(t-Δτ) (7)

η (t) is for disturbing and noise component(s).

Visible by formula (6), the differential phase signal

Pulse amplitude modulation (PAM) signal that can regard the noise effect that superposeed as, wherein { I _kBe the information code element sequence, p _{Δ τ}(t) be transmission pulse.

2.1 the concrete realization of BBP

Fig. 2 is the modular structure sketch map of BBP of the incoherent detection device of one embodiment of the invention.As shown in the figure, this BBP 105 can comprise again:

Matched filter 106 is used for differential phase

(impulse response of this matched filter 106 is p to carry out matched filter processing _{Δ τ}(-t)), obtain the 3rd output signal z (t), promptly

Sampling module 107; Be used for the 3rd output signal z (t) is sampled at t=nT with symbol interval constantly; Obtain output sequence z (n), i.e.

DFF 108 is used for output sequence z (n) is pursued the decision feedback equalization processing of code element, obtains the transfer sequence { I of interference effect between blanking code _kEstimated value;

Output module 109 is used to export transfer sequence { I _kEstimated value.

In the present embodiment, differential phase signal

Through matched filter p _{Δ τ}After the (-t), obtain the 3rd output signal z (t), its expression formula is:

$z\left(t\right)=\underset{i}{\mathrm{\&Sigma;}}{I}_i\mathrm{\&rho;}(t-\mathrm{iT})+v\left(t\right)---\left(8\right)$

Wherein ρ (t) is p _{Δ τ}(t) auto-correlation, v (t) is the output of η (t) behind matched filter 106.

Output sequence z (n) after symbol interval t=nT sampling is:

$z\left(n\right)=\underset{i}{\mathrm{\&Sigma;}}{I}_i\mathrm{\&rho;}(n-i)+v\left(n\right)---\left(9\right)$

In the present embodiment, DFF 108 is eliminated the influence of intersymbol interference through the processing to discrete series z (n), and obtains the estimated value of transfer sequence.

The sequence equalizer that being designed to of best equalizer handled based on Viterbi, but as far as multi-system partial response CPM signal, this design complexities is higher, is not easy to hardware and realizes.Therefore adopt a kind of simple DFF among the present invention.

2.2 the concrete realization of DFF

Fig. 3 is the modular structure sketch map of DFF of BBP of the incoherent detection device of one embodiment of the invention.As shown in the figure, this DFF 108 can comprise again:

Feedforward transversal filter coefficient is asked for module 110, is used to adopt Zero Forcing to ask for feedforward transversal filter coefficient { fff _k;

Feedback transversal filter coefficient is asked for module 111, is used for channel impulse response { ρ _jAnd feedforward transversal filter coefficient { fff _kCarry out convolution, ask for feedback transversal filter coefficient { fbf _k;

Module 112 is sent in filtering, is used for that output sequence z (n) is sent into feedforward transversal filter 115 by sampling point and carries out Filtering Processing, and feedback transversal filter 116 is sent in the output of symbol judgement device 114 carried out Filtering Processing;

Summation module 113; Transversal filter 115 and the output of feedback transversal filter 116 processing of suing for peace that is used for feedovering, and result

sent into symbol judgement device 114;

Symbol judgement device 114 is used for according to preset thresholding result

being pursued symbol judgement.

In the present embodiment, base band can Gaussian pulse be shaped, the 4CPM signal of correlation length L=3 in order to adopt.-2,0,2 three preset thresholdings so can be set, can obtain the bit decision value for ± 3 or ± a kind of in 1.

Specifically for instance, adopt Gaussian pulse to be shaped with base band, correlation length L=3 is an example, carries out the design of DFF.Try to achieve channel impulse response { ρ by formula (3) and formula (7) through calculating _jAfterwards, with { ρ _jLength block and be 4T, and to select the exponent number of feedforward transversal filter be 3.Adopt Zero Forcing to ask for the coefficient { fff of feedforward filter (Feed Forward Filter) _k(k=0,1,2), computing formula is suc as formula shown in (10).

$\left[\begin{array}{ccc}{\mathrm{\&rho;}}_0& {\mathrm{\&rho;}}_1& {\mathrm{\&rho;}}_2\\ {\mathrm{\&rho;}}_1& {\mathrm{\&rho;}}_2& {\mathrm{\&rho;}}_3\\ {\mathrm{\&rho;}}_2& {\mathrm{\&rho;}}_3& {\mathrm{\&rho;}}_4\end{array}\right]\left[\begin{array}{c}{\mathrm{<figure-callout\; id="2"\; label="fff"\; filenames="HDA0000064010650000052.png"\; state="\{\{state\}\}">fff</figure-callout>}}_2\\ {\mathrm{<figure-callout\; id="1"\; label="fff"\; filenames="HDA0000064010650000011.png"\; state="\{\{state\}\}">fff</figure-callout>}}_1\\ {\mathrm{fff}}_0\end{array}\right]=\left[\begin{array}{c}0\\ 0\\ 1\end{array}\right]---\left(10\right)$

With channel impulse response { ρ _jAnd feed-forward filter coefficients { fff _kCarry out convolution, can obtain equivalent impulse response { g _i(i=0,1,2 ... 6).Equivalence impulse response preceding four values all are approximately zero, so DFF only needs to consider back three paths in subsequent treatment, comprise a main footpath with two after directly influence.Coefficient { the fbf of feedback filter (feed back filter) _k(k=0,1) be { g _i(i=5,6).When base band adopted Gaussian pulse to be shaped, because of the value in the last item path is very little, feedback filter can be reduced to monosystem and count multiplier.

3. the execution of incoherent detection method

Fig. 4 is the schematic flow sheet of incoherent detection method of the continuous phase modulated signal of one embodiment of the invention.As shown in the figure, this incoherent detection method 400 can comprise step:

Execution in step S401. obtains the baseband receiving signals r (t) after down-conversion;

Execution in step S402. carries out low-pass filtering treatment with the filtering out-of-band noise to baseband receiving signals r (t), obtains the first output signal x (t), and wherein the bandwidth of low pass filter can be set to comprise the signal bandwidth of 99% energy;

Execution in step S403. does relevant to the first output signal x (t) and himself inhibit signal (retardation is Δ τ), obtain second and export signal y (t), i.e. y (t)=x (t) x ^*(t-Δ τ);

Execution in step S404. asks multiple angle to the second output signal y (t), and multiply by scale factor

back output differential phase

i.e.

Execution in step S405. is to differential phase

(impulse response of matched filter is p to carry out matched filter processing _{Δ τ}(-t)), obtain the 3rd output signal z (t), promptly

Execution in step S406. samples at t=nT with symbol interval to the 3rd output signal z (t) constantly; Obtain output sequence z (n), i.e.

Execution in step S407. handles the decision feedback equalization that output sequence z (n) pursues code element, obtains the transfer sequence { I of interference effect between blanking code _kEstimated value;

Execution in step S408. output transfer sequence { I _kEstimated value.

Fig. 5 pursues the method schematic flow diagram of the decision feedback equalization processing of code element for one embodiment of the invention to output sequence.Be that step S407 can also comprise step among above-mentioned Fig. 4:

Execution in step S501. adopts Zero Forcing to ask for feedforward transversal filter coefficient { fff _k;

Execution in step S502. is with channel impulse response { ρ _jAnd feedforward transversal filter coefficient { fff _kCarry out convolution, ask for feedback transversal filter coefficient { fbf _k;

Execution in step S503. sends into the feedforward transversal filter with output sequence z (n) by sampling point and carries out Filtering Processing, and the feedback transversal filter is sent in the output of symbol judgement device carried out Filtering Processing;

To the feedover output processing of suing for peace of transversal filter and feedback transversal filter of execution in step S504., and result

sent into the symbol judgement device;

Execution in step S505. symbol judgement device pursues symbol judgement according to preset thresholding to result

.

In the present embodiment, base band can Gaussian pulse be shaped, the 4CPM signal of correlation length L=3 in order to adopt.-2,0,2 three preset thresholdings so can be set, can obtain the bit decision value for ± 3 or ± a kind of in 1.

Wherein, In order to obtain the linear approximation expression formula of

, suppose satisfying following two conditions:

1) φ _D(t, amplitude I) is less than π.At h, under the given situation of M and q (t), can satisfy this condition through the value of selecting Δ τ.

2) phase change that channel causes in Δ τ is enough little.

Than under the high s/n ratio; In conjunction with above-mentioned two conditions, the linear approximation expression formula that can obtain

is suc as formula shown in (6).

Wherein

p _Δτ(t)＝q(t)-q(t-Δτ) (7)

η (t) is for disturbing and noise component(s).

Visible by formula (6), the differential phase signal Pulse amplitude modulation (PAM) signal that can regard the noise effect that superposeed as, wherein { I _kBe the information code element sequence, p _{Δ τ}(t) be transmission pulse.

4. performance simulation and analysis

The quaternary CPM signal that adopts Gaussian pulse to be shaped with base band is that example is carried out performance simulation and analysis.Modulation index h=1/3 is set, character rate R _s=32ksps.It is the signal bandwidth that comprises 99% energy that the low pass filter bandwidth is set, the retardation Δ τ=T/4 in the differential correlator.Choose that the time wide bandwidth of base band Gauss forming filter is long-pending to be BT=1 and BT=0.5, emulation obtains the error rate under the awgn channel condition respectively like Fig. 6 and shown in Figure 7.For ease of relatively, the error performance when having provided the sequential detector that adopts in the BBP based on viterbi algorithm among Fig. 6 and Fig. 7 simultaneously.

Visible by Fig. 6, when adopting Gauss's pre-filtering processing of BT=1, reach 10 for making the error rate ^-3, adopt the signal to noise ratio that DFF brought to increase in the BBP less than 0.5dB.Visible by Fig. 7, when adopting Gauss's pre-filtering processing of BT=0.5, reach 10 for making the error rate ^-3, adopt the signal to noise ratio that DFF brought to increase in the BBP less than 1dB.Adopt by the DFF of symbol judgement and compare based on the sequential detector of viterbi algorithm with employing, available less performance loss exchanges the very big reduction of hardware implementation complexity for.

In sum, the invention provides a kind of design of CPM receiver of low complex degree, handle, obtain sending the estimation of sequence through the differential phase signal being carried out matched filtering and decision feedback equalization.Scheme of the present invention simplicity of design, hardware under the prerequisite that guarantees receptivity are easy to realization, and have error performance preferably, possess better practicability and economy.

Though the present invention with preferred embodiment openly as above; But it is not to be used for limiting the present invention; Any those skilled in the art are not breaking away from the spirit and scope of the present invention; Can make possible change and modification, so protection scope of the present invention should be as the criterion with the scope that claim of the present invention was defined.

Claims (10)

1. the incoherent detection method of a continuous phase modulated signal comprises step:

A. obtain the baseband receiving signals after down-conversion;

B. said baseband receiving signals is carried out low-pass filtering treatment with the filtering out-of-band noise, obtain the first output signal;

C. the said first output signal and himself inhibit signal are done relevantly, obtained second and export signal;

D. the said second output signal is asked multiple angle, and export differential phase after multiply by scale factor;

E. said differential phase is carried out matched filter processing, obtain the 3rd output signal;

F. said the 3rd output signal is sampled with symbol interval, obtain output sequence;

G. said output sequence is pursued the decision feedback equalization processing of code element, obtain the estimated value of the transfer sequence of interference effect between blanking code;

H. export the estimated value of said transfer sequence.

2. incoherent detection method according to claim 1 is characterized in that, said step G comprises step:

G1. adopt Zero Forcing to ask for feedforward transversal filter coefficient;

G2. channel impulse response and said feedforward transversal filter coefficient are carried out convolution, ask for feedback transversal filter coefficient;

G3. said output sequence is sent into the feedforward transversal filter by sampling point and carry out Filtering Processing, and the feedback transversal filter is sent in the output of symbol judgement device carried out Filtering Processing;

G4. send into said symbol judgement device with of the output processing of suing for peace of said feedforward transversal filter, and with the result with the feedback transversal filter;

G5. said symbol judgement device pursues symbol judgement according to preset thresholding to said result.

3. incoherent detection method according to claim 1 and 2 is characterized in that the bandwidth of said low pass filter is set to comprise the signal bandwidth of 99% energy.

4. incoherent detection method according to claim 3 is characterized in that, Gaussian pulse is shaped said base band, the 4CPM signal of correlation length L=3 in order to adopt.

5. incoherent detection method according to claim 4 is characterized in that, said preset thresholding comprises-2,0,2 three thresholdings.

6. the incoherent detection device of a continuous phase modulated signal comprises:

The baseband receiving signals acquisition module is used to obtain the baseband receiving signals after down-conversion;

Low pass filter is used for said baseband receiving signals is carried out low-pass filtering treatment, with the filtering out-of-band noise, obtains the first output signal;

Postpone correlator, be used for the said first output signal and himself inhibit signal are done relevant, obtain second and export signal;

The differential phase acquisition module is used for the said second output signal is asked multiple angle, and exports differential phase after multiply by scale factor;

Matched filter is used for said differential phase is carried out matched filter processing, obtains the 3rd output signal;

Sampling module is used for said the 3rd output signal is sampled with symbol interval, obtains output sequence;

DFF is used for said output sequence is pursued the decision feedback equalization processing of code element, obtains the estimated value of the transfer sequence of interference effect between blanking code;

Output module is used to export the estimated value of said transfer sequence.

7. incoherent detection device according to claim 6 is characterized in that, said DFF comprises:

Feedforward transversal filter coefficient is asked for module, is used to adopt Zero Forcing to ask for said feedforward transversal filter coefficient;

Feedback transversal filter coefficient is asked for module, is used for channel impulse response and said feedforward transversal filter coefficient are carried out convolution, asks for said feedback transversal filter coefficient;

Module is sent in filtering, is used for that said output sequence is sent into the feedforward transversal filter by sampling point and carries out Filtering Processing, and the feedback transversal filter is sent in the output of symbol judgement device carried out Filtering Processing;

Summation module is used for output the sue for peace processing of said feedforward transversal filter with the feedback transversal filter, and the result is sent into said symbol judgement device;

The symbol judgement device is used for according to preset thresholding said result being pursued symbol judgement.

8. according to claim 6 or 7 described incoherent detection devices, it is characterized in that the bandwidth of said low pass filter is set to comprise the signal bandwidth of 99% energy.

9. incoherent detection device according to claim 8 is characterized in that, Gaussian pulse is shaped said base band, the 4CPM signal of correlation length L=3 in order to adopt.

10. incoherent detection device according to claim 9 is characterized in that, said preset thresholding comprises-2,0,2 three thresholdings.

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