CN106487731A - A kind of mixed carrier modulator approach based on wavelet transformation and system - Google Patents
A kind of mixed carrier modulator approach based on wavelet transformation 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
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03343—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03821—Inter-carrier interference cancellation [ICI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
- H04L2025/03375—Passband transmission
- H04L2025/03401—PSK
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- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The present invention discloses a kind of mixed carrier modulator approach based on wavelet transformation and system, it adopts and suppresses ISI/ICI interference problem under doubly selective channel based on the mixed carrier modulator approach of wavelet transformation, it has merged small echo and has changed the modulating characteristic with monotropic carrier wave, can simultaneous transmission SC and MC modulation signal, thus successfully achieving signal rotating freely in time-frequency domain plane.Overloading wave component is to ten points of sensitivities of ICI produced by Doppler frequency shift, and the ISI caused by delay spread can produce large effect to single carrier component, but by changing modulation parameter, can effectively reduce the impact to system for two kinds of interference.
Description
Technical field
The present invention relates to wireless communication technology field is and in particular to a kind of mixed carrier modulator approach based on wavelet transformation
And system.
Background technology
Wireless channel presents double disperse characteristics under high-speed mobile environment, i.e. time-frequency double selectivity decline (DS：Doubly
Selective fading).Under this channel, the communication quality of communication system can be affected by following both sides, one be by
In intersymbol interference (ISI produced by multidiameter delay：Inter Symbol Interference), another is Doppler's effect
Inter-sub-carrier interference (the ICI that should cause：Inter Carrier Interference), how effectively to suppress both to disturb,
The communication performance of raising system is the problem having in communication solve.
At present, single carrier (SC：Single-Carrier) modulation technique and the multicarrier with OFDM as representative
(MC:Multi-Carrier) modulation technique is the common method solving the above problems.Single-carrier system is not affected by ICI, but many
Footpath is propagated the ISI causing and is but difficult to eliminate, and that is, single carrier modulation system is highly susceptible to the impact of ISI.OFDM skill
Under DS channel, Doppler frequency shift destroys the orthogonality between subcarrier to art, thus there is serious ICI.
Content of the invention
The present invention provides a kind of mixed carrier modulator approach based on wavelet transformation and system, and it can effectively suppress at a high speed
Under mobile environment, Doppler frequency shift and many signal of communication energy causing through transmission effects are when time domain and frequency domain produce respectively
Prolong extension and doppler spread, thus improving the performance of communication system.
For solving the above problems, the present invention is achieved by the following technical solutions：
A kind of mixed carrier modulator approach based on wavelet transformation, comprises the steps：
The initial data of input is carried out baseband modulation by step 1, transmitting terminal；
Step 2, the signal after baseband modulation is carried out-a rank mixed carrier modulation；
Step 2.1, the signal after baseband modulation is divided into 4 branch roads；
Step 2.2, respectively every 1 branch road is processed, that is,：
For zero branch road, directly it is weighted processing；
For tie point, first carry out wavelet transform process, then be weighted processing；
For the second branch road, first carry out upset process, then be weighted processing；
For the 3rd branch road, first carry out wavelet transform process, then carry out upset process, after be weighted process；
Step 2.3, by process after 4 branch roads be overlapped；
Step 3, mixed carrier is modulated after signal carry out parallel serial conversion after, be transmitted by time-frequency doubly selective channel；
Step 4, receiving terminal receive the signal that time-frequency doubly selective channel is sent, and to its serial to parallel conversion；
Step 5, to serial to parallel conversion conversion after signal carry out wavelet transformation；
Step 6, the signal after wavelet transformation is carried out a-1 rank mixed carrier demodulation；I.e.：
Step 6.1, it was divided into 4 branch roads by entering the signal after wavelet transformation
Step 6.2, respectively every 1 branch road is processed, that is,：
For zero branch road, directly it is weighted processing；
For tie point, first carry out wavelet transform process, then be weighted processing；
For the second branch road, first carry out upset process, then be weighted processing；
For the 3rd branch road, first carry out wavelet transform process, then carry out upset process, after be weighted process；
Step 6.3, by process after 4 branch roads be overlapped；
Step 7, to mixed carrier demodulation after signal carry out base band demodulating, recover initial data；
Above-mentionedaFor modulation parameter.
In above-mentioned steps 2 and step 6, the computing formula of weight coefficient is：
A (a)=cos (a π/4) cos (a pi/2) exp (3aj π/4)
In formula, a is modulation parameter.
In above-mentioned steps 2, the weight coefficient on zero branch road is A (- a+2)；The weight coefficient of tie point is A (- a+1)；
The weight coefficient of the second branch road is A (- a)；The weight coefficient of the 3rd branch road is A (- a-1).
In above-mentioned steps 6, the weight coefficient on zero branch road is A [(a-1)+2]；The weight coefficient of tie point is A [(a-
1)+1]；The weight coefficient of the second branch road is A (a-1)；The weight coefficient of the 3rd branch road is A [(a-1) -1].
In such scheme, the value of modulation parameter a is -2≤a≤- 1.
In above-mentioned steps 1, described baseband modulation is modulated for dpsk differential baseband；In step 7, described base band demodulating is dpsk
Differential baseband demodulates.
A kind of mixed carrier modulating system based on wavelet transformation, including transmitting terminal and receiving terminal, wherein transmitting terminal and connecing
Receiving end is connected by time-frequency doubly selective channel；Transmitting terminal include baseband modulator, the mixed carrier manipulator based on wavelet transformation and
Parallel-to-serial converter；Baseband modulator input data source, the outfan of baseband modulator connects based on small echo change through baseband modulator
The input of the mixed carrier manipulator changing, the outfan of the mixed carrier manipulator based on wavelet transformation is through parallel-to-serial converter even
Connect time-frequency doubly selective channel；Receiving terminal include deserializer, wavelet transformer, the mixed carrier demodulator based on wavelet transformation and
Base band demodulator；The input of deserializer connects time-frequency doubly selective channel, and the outfan of deserializer is through wavelet transformer
Connect the input of the mixed carrier demodulator based on wavelet transformation, the outfan of the mixed carrier demodulator based on wavelet transformation
Connect the input of base band demodulator, the outfan output data of base band demodulator.
Baseband modulator is dpsk manipulator, and base band demodulator is dpsk demodulator.
Compared with prior art, the present invention modulates (HCM using the mixed carrier based on wavelet transformation:Hybrid
Carrier Modulation System) suppressing ISI/ICI interference problem under doubly selective channel, it has merged small echo and has changed method
With the modulating characteristic of monotropic carrier wave, can simultaneous transmission SC and MC modulation signal, thus successfully achieving signal in time-frequency
The rotating freely of domain plane.Overloading wave component to ten points of sensitivities of ICI produced by Doppler frequency shift, and caused by delay spread
ISI can to single carrier component produce large effect, but by change modulation parameter, can effectively reduce by two kinds interference to system
Impact.
Brief description
Fig. 1 is the schematic diagram of the mixed carrier modulator approach based on wavelet transformation.
Fig. 2 is the system block diagram of the mixed carrier modulating system based on wavelet transformation.
Mixed carrier modulation based on wavelet transformation and conventional multi-carrier performance comparison figure when Fig. 3 is static.
Fig. 4 is when the v=150 kilometer/hour of mixed carrier modulation based on wavelet transformation and conventional multi-carrier performance comparison
Figure.
Specific embodiment
Mixed carrier modulation principle based on wavelet transformation is as follows：
Sequence of complex numbers D for any N length0=[d0d1....dN-1], its weighted score wavelet transformation passes through discrete wavelet
Transformation matrix F can be defined as：
ηa[D]=WaD (1)
Wherein weighting matrix WaFor：
Wa=A (a+2) IN+A(a+1)F+A(a)PIN+A(a-1)PF (2)
In formula, A (a) is weight coefficient, A (a)=cos (a π/4) cos (a pi/2) exp (3aj π/4)；The taking of modulation parameter a
It is worth for -2≤a≤- 1.INIt is the unit matrix of a N*N, F is a wavelet transform matrix, P is a permutation matrix,
Pij=δ (＜ i+j-2 ＞N), wherein the dimension of P to be determined by the dimension of input signal, ＜ ＞NIt is modular arithmetic.The expression formula of P is such as
Under：
Formula (1) is used physics block diagram to realize description as shown in Figure 1.Input one group of serial data, length is N, through string
And after changing, it is divided into 4 branch roads, wherein tie point is weighted after based on haar wavelet transformation, and the 3rd branch road passes through
Finally it is weighted through module upset after haar wavelet transformation, this two branch road and traditional multi-carrier modulation are much like, area again
It is not that this two-way of the modulation of the mixed carrier based on wavelet transformation is weighted module.Wherein zero branch road is through simple
Weighting is processed, and the second branch road first carries out overturning and is weighted processing again, and this two-way can regard traditional single-carrier modulated as.Finally
By this four branch road superpositions.
To sum up consider the process of four branch roads, the mixed carrier modulation based on wavelet transformation physically achieves single carrier
Two partly belong to single multicarrier mixing transformation with multicarrier.And based on wavelet transformation mixed carrier modulation can flexibly select
Select modulation parameter a, be so capable of the conversion of more preferable adaptive channel.
As follows with regard to weighted score change wavelet matrix property：
(1) as a=-1,
W-1=F (4)
(2) as a=-2,
W-2=I (5)
(3) weighting matrix is 4 with regard to the cycle of modulation parameter a, that is,
Wa+4=Wa(6)
By the property of weighting matrix it can be seen that when modulation parameter a=-1, η-1[D]=FD, mixed carrier
Modulation is just degenerated to multicarrier modulation system, when a=-2, η-2[D]=D mixed carrier modulating system is just degenerated to single load
Ripple modulating system.
Mixed carrier is modulated with two important properties, as follows：
(1) modulation parameter additivity
ηa+β[D]=ηaηβ[D]=ηβηa[D] (7)
(2) orthogonality
Wa H=W-a(8)
W can be drawn by above-mentioned property 1 and property 2aBe an orthogonal matrix be Wa HWa=I.
Analyzed based on above, a kind of mixed carrier modulator approach based on wavelet transformation designed by the present invention, specifically real
Apply step as follows：
Step one, the sub-carrier number of hypothesis system are N, the signal S after digital baseband dpsk mappinga=(s1,
s2,...sm)TMixed carrier domain signal for a rank.
The sub-carrier number of hypothesis system is N, and the data source information of generation is carried out 4dpsk differential baseband modulation, concrete tune
It is made as in four phase dpsk modulation, that is, 0 ° of relative displacement between interval in succession, 180 °, 270 °, corresponds respectively to information ratio by 90 °
Special 00,01,11, and 10.The mixed carrier domain signal S of a rank can be regarded as after 4dpsk modulationa=(s1, s2 ... sm)T.
Step 2, mixed carrier domain signal is passed through-a rank mixed carrier modulation become time-domain signal Q.I.e.：
First, by S inside modulationaIt is divided into 4 branch roads after serioparallel exchange.
Secondly, respectively each branch road is processed.
Tie point first passes through based on haar wavelet transformation, then is weighted, and its weight coefficient is A (- a+1).3rd
Road first passes through haar wavelet transformation, then carries out module upset, after be weighted process, its weight coefficient be A (- a-1).First
Road and the 3rd branch road are much like with traditional multi-carrier modulation, difference be based on wavelet transformation mixed carrier modulation this two
Road is weighted module.Zero branch road is processed through simple weighting, and its weight coefficient is A (- a+2).Second branch road is advanced
Row upset, then be weighted processing, its weight coefficient is A (- a).Zero branch road and the second branch road can be regarded traditional list as and carry
Ripple is modulated.
Finally, by this 4 branch road superpositions.
To sum up consider the process of 4 branch roads, the mixed carrier modulation based on wavelet transformation physically achieves single carrier
With multicarrier mixing transformation, and can flexibly select modulation parameter a, so be capable of the conversion of more preferable adaptive channel.Work as tune
When parameter a=-1 processed, this system becomes traditional wavelet transformation modulating system；As a=-2, become single carrier and adjust system；And
Other orders fall between.In the double fading channel of time-frequency, all there is floor effect in single carrier and multicarrier system, and work as
Modulation parameter just can effectively adapt to the feature of channel fading between -2 to -1, has higher performance.
The expression formula of Q is as follows：
Q=W-aSa(9)
According to above-mentioned property 2, Q can be rewritten into
Q=W-1W-a+1Sa=F-1U (10)
Wherein U is SaResult through the-a+1 rank of the mixed carrier modulation based on wavelet transformation.I.e. U=W-a+1[Sa].
Step 3, the signal after mixed carrier modulating transformation is passed through after parallel serial conversion time-frequency double choosing letter
Road.This channel has four through time delay, and often through a corresponding power, and it is superimposed a maximum Doppler frequency offset.Now signal is not
Only disturbed by channel, but also the disturbing of interchannel noise to be subject to.
Signal, through double dispersive channel, can be expressed as in the output of receiving terminal：
Y (n)=x (n) * h (n)+w (n) (11)
In above formula, * represents convolution, and h (n) is the shock response of channel, is w (n) additive white Gaussian noise, and x (n) is to send
End signal, y (n) is receiving end signal.H (n) expression formula is：
Wherein hlAnd τlIt is l footpath in the multiple impulse response of time domain and the time delay of l warp, τ is delay parameter, L is many warps
Number is in slow fading, constant when time delay is considered as.And the time delay of fast fading channel such as UWA channel DVB channel, when
Prolonging is the τ of linear transformationlT ()=cl- σ t, wherein σ are Doppler factor.
Step 4, the signal of receiving terminal sequentially pass through to be gone here and there and converts, wavelet transformation.
Step 5, the a-1 rank mixed carrier carrying out the signal after wavelet transformation based on wavelet transformation demodulate.
First, it is divided into 4 branch roads by entering the signal after wavelet transformation.
Secondly, respectively every 1 branch road is processed.
Tie point first passes through based on haar wavelet transformation, then is weighted, and its weight coefficient is A (a-1+1).3rd
Road first passes through haar wavelet transformation, then carries out module upset, after be weighted process, its weight coefficient be A (a-1-1).First
Branch road and the 3rd branch road are much like with the demodulation of traditional multicarrier, and difference is this of the mixed carrier demodulation based on wavelet transformation
Two-way is weighted module.Zero branch road is processed through simple weighting, and its weight coefficient is A (a-1+2).Second branch road is first
Overturn, then be weighted processing, its weight coefficient is A (a-1).Zero branch road and the second branch road can regard traditional list as
Carrier wave demodulation.
Finally, 4 branch roads after processing are overlapped.
Step 6, finally carry out differential ference spiral, obtain output data.
Based on a kind of mixed carrier modulating system based on wavelet transformation designed by said method, as shown in Fig. 2 including
Transmitting terminal and receiving terminal, wherein transmitting terminal and receiving terminal are connected by time-frequency doubly selective channel.Transmitting terminal includes baseband modulator, base
Mixed carrier manipulator and parallel-to-serial converter in wavelet transformation.The input input data of baseband modulator, baseband modulator
Outfan connect the input of mixed carrier manipulator based on wavelet transformation through baseband modulator, mixed based on wavelet transformation
The outfan closing carrier modulator connects time-frequency doubly selective channel through parallel-to-serial converter.Receiving terminal includes deserializer, small echo becomes
Parallel operation, the mixed carrier demodulator based on wavelet transformation and base band demodulator.The input of deserializer connects the double choosing of time-frequency
Channel, the outfan of deserializer connects the input of the mixed carrier demodulator based on wavelet transformation through wavelet transformer,
The outfan of the mixed carrier demodulator based on wavelet transformation connects the input of base band demodulator, the outfan of base band demodulator
Output data.In the present invention, baseband modulator is dpsk manipulator, and base band demodulator is dpsk demodulator.
Allow modulated signal in transmitting terminal using based on the mixed carrier modulation technique of wavelet transformation in time domain and frequency
Be changed between domain, and due to signal through-a rank based on wavelet transformation mixed carrier modulate after, the energy of signal can
Distributed with uniform, after channel, the interference of channel can be evenly dispersed on signal, so more has sentencing using signal
Certainly.In receiving terminal through corresponding demodulation method, data must be recovered by demodulating of a-1 rank.To be improved with this and to move at a high speed
The performance of communication system under rotating ring border.
Mixed carrier modulation based on wavelet transformation and conventional multi-carrier performance comparison figure when Fig. 3 is static.Fig. 4 is to work as v
=150 kilometers/hour of mixed carrier modulation based on wavelet transformation and conventional multi-carrier performance comparison figure.According to wavelet transformation and
Spectrogram contrast after OFDM understands：(1) wavelet transformation has higher spectrum efficiency, and is subject to Doppler's frequency
Inclined impact is relatively small.(2) the mixed carrier system based on wavelet transformation is the mixture of single carrier multicarrier, and system is subject to
Carrier wave frequency deviation disturb between single carrier and multicarrier.And multicarrier system is more sensitive to inter-carrier interference, when transmission connects
When receiving end has frequency departure, multicarrier system occurs serious floor effect, and single-carrier system is hardly subject to intercarrier
Interference.(3) based on wavelet transformation mixed carrier modulation can flexible modulation system modulation order, basis in actual applications
The transmission conditions of channel, can select a preferably modulation order relatively thus obtaining more excellent systematic function.
The present invention is directed to the Doppler frequency deviation and multipath faidng impact to signal transmission quality under high-speed mobile environment, in conjunction with
Wavelet transformation and the advantage of single-carrier modulated, are suppressed under doubly selective channel by the mixed carrier modulator approach based on wavelet transformation
ISI/ICI interference problem, thus improve system transfers performance.
Claims (8)
1. a kind of mixed carrier modulator approach based on wavelet transformation, is characterized in that, comprise the steps：
The initial data of input is carried out baseband modulation by step 1, transmitting terminal；
Step 2, the signal after baseband modulation is carried out-a rank mixed carrier modulation；
Step 2.1, the signal after baseband modulation is divided into 4 branch roads；
Step 2.2, respectively every 1 branch road is processed, that is,：
For zero branch road, directly it is weighted processing；
For tie point, first carry out wavelet transform process, then be weighted processing；
For the second branch road, first carry out upset process, then be weighted processing；
For the 3rd branch road, first carry out wavelet transform process, then carry out upset process, after be weighted process；
Step 2.3, by process after 4 branch roads be overlapped；
Step 3, mixed carrier is modulated after signal carry out parallel serial conversion after, be transmitted by time-frequency doubly selective channel；
Step 4, receiving terminal receive the signal that time-frequency doubly selective channel is sent, and to its serial to parallel conversion；
Step 5, to serial to parallel conversion conversion after signal carry out wavelet transformation；
Step 6, the signal after wavelet transformation is carried out a-1 rank mixed carrier demodulation；I.e.：
Step 6.1, it was divided into 4 branch roads by entering the signal after wavelet transformation
Step 6.2, respectively every 1 branch road is processed, that is,：
For zero branch road, directly it is weighted processing；
For tie point, first carry out wavelet transform process, then be weighted processing；
For the second branch road, first carry out upset process, then be weighted processing；
For the 3rd branch road, first carry out wavelet transform process, then carry out upset process, after be weighted process；
Step 6.3, by process after 4 branch roads be overlapped；
Step 7, to mixed carrier demodulation after signal carry out base band demodulating, recover initial data；
Above-mentioned a is modulation parameter.
2. a kind of mixed carrier modulator approach based on wavelet transformation according to claim 1, is characterized in that, step 2 and
In step 6, the computing formula of weight coefficient is：
A (a)=cos (a π/4) cos (a pi/2) exp (3aj π/4)
In formula, a is modulation parameter.
3. a kind of mixed carrier modulator approach based on wavelet transformation according to claim 1 and 2, is characterized in that, step 2
In, the weight coefficient on zero branch road is A (- a+2)；The weight coefficient of tie point is A (- a+1)；The weight coefficient of the second branch road
For A (- a)；The weight coefficient of the 3rd branch road is A (- a-1).
4. a kind of mixed carrier modulator approach based on wavelet transformation according to claim 1 and 2, is characterized in that, step 6
In, the weight coefficient on zero branch road is A [(a-1)+2]；The weight coefficient of tie point is A [(a-1)+1]；Second branch road plus
Weight coefficient is A (a-1)；The weight coefficient of the 3rd branch road is A [(a-1) -1].
5. a kind of mixed carrier modulator approach based on wavelet transformation according to claim 1, is characterized in that, modulation parameter
The value of a is -2≤a≤- 1.
6. a kind of mixed carrier modulator approach based on wavelet transformation according to claim 1, is characterized in that, in step 1,
Described baseband modulation is modulated for dpsk differential baseband；In step 7, described base band demodulating demodulates for dpsk differential baseband.
7. a kind of mixed carrier modulating system based on wavelet transformation it is characterised in that：Including transmitting terminal and receiving terminal, wherein send out
Sending end and receiving terminal are connected by time-frequency doubly selective channel；
Transmitting terminal includes baseband modulator, the mixed carrier manipulator based on wavelet transformation and parallel-to-serial converter；Baseband modulator
Input data source, the outfan of baseband modulator connects the defeated of the mixed carrier manipulator based on wavelet transformation through baseband modulator
Enter end, the outfan of the mixed carrier manipulator based on wavelet transformation connects time-frequency doubly selective channel through parallel-to-serial converter；
Receiving terminal includes deserializer, wavelet transformer, the mixed carrier demodulator based on wavelet transformation and base band demodulator；
The input of deserializer connects time-frequency doubly selective channel, and the outfan of deserializer connects based on small echo through wavelet transformer
The input of the mixed carrier demodulator of conversion, the outfan of the mixed carrier demodulator based on wavelet transformation connects base band demodulating
The input of device, the outfan output data of base band demodulator.
8. a kind of mixed carrier modulating system based on wavelet transformation according to claim 7 it is characterised in that：Base band is adjusted
Device processed is dpsk manipulator, and base band demodulator is dpsk demodulator.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108092736A (en) * | 2017-12-26 | 2018-05-29 | 广州海格通信集团股份有限公司 | A kind of low detection probability waveform display method based on wavelet transformation |
| CN108667756A (en) * | 2018-05-04 | 2018-10-16 | 桂林电子科技大学 | A kind of transmission method of the multicarrier system based on rotation wavelet basis |
| CN112714090A (en) * | 2020-12-23 | 2021-04-27 | 哈尔滨工业大学 | Transmission method of weighted fractional Fourier transform extended hybrid carrier |
| WO2022083591A1 (en) * | 2020-10-20 | 2022-04-28 | 华为技术有限公司 | Signal processing method and related device |
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| CN108092736B (en) * | 2017-12-26 | 2019-12-10 | 广州海格通信集团股份有限公司 | Low detection probability waveform method based on wavelet transformation |
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| CN108667756B (en) * | 2018-05-04 | 2021-05-04 | 桂林电子科技大学 | Transmission method of multi-carrier system based on rotating wavelet base |
| WO2022083591A1 (en) * | 2020-10-20 | 2022-04-28 | 华为技术有限公司 | Signal processing method and related device |
| CN112714090A (en) * | 2020-12-23 | 2021-04-27 | 哈尔滨工业大学 | Transmission method of weighted fractional Fourier transform extended hybrid carrier |
| CN112714090B (en) * | 2020-12-23 | 2022-07-19 | 哈尔滨工业大学 | Transmission method of weighted fractional Fourier transform extended hybrid carrier |
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