CN206283528U - A kind of mixed carrier modulating system based on wavelet transformation - Google Patents
A kind of mixed carrier modulating system based on wavelet transformation Download PDFInfo
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- CN206283528U CN206283528U CN201621416860.4U CN201621416860U CN206283528U CN 206283528 U CN206283528 U CN 206283528U CN 201621416860 U CN201621416860 U CN 201621416860U CN 206283528 U CN206283528 U CN 206283528U
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- wavelet transformation
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- demodulation
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Abstract
The utility model discloses a kind of mixed carrier modulating system based on wavelet transformation, it uses the mixed carrier modulator approach based on wavelet transformation to suppress ISI/ICI interference problems under doubly selective channel, it has merged small echo and has changed modulating characteristic with monotropic carrier wave, it is capable of the signal of simultaneous transmission SC and MC modulation, so as to successfully realize signal rotating freely in time-frequency domain plane.Overloading wave component is to the ten points of sensitivities of ICI as 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 influence of two kinds of interference to system.
Description
Technical field
The utility model is related to wireless communication technology field, and in particular to a kind of mixed carrier modulation based on wavelet transformation
System.
Background technology
Wireless channel shows double disperse characteristics, i.e. time-frequency double selectivity decline (DS under high-speed mobile environment：Doubly
Selective fading).The communication quality of communication system can be influenceed by following both sides under this channel, one be by
In the 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 interference,
The communication performance of raising system is the problem for having to solve in communicating.
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 for solving the above problems.Single-carrier system is not influenceed by ICI, but many
Footpath is propagated the ISI for causing and is but difficult to eliminate, i.e., single carrier modulation system is highly susceptible to the influence of ISI.OFDM skill
Under DS channels, Doppler frequency shift destroys the orthogonality between subcarrier to art, so that in the presence of serious ICI.
Utility model content
The utility model provides a kind of mixed carrier modulating system based on wavelet transformation, and it can effectively suppress to move at a high speed
The time delay that Doppler frequency shift and many signal of communication energy caused through transmission effects are produced respectively in time domain and frequency domain under rotating ring border
Extension and doppler spread, so as to improve the performance of communication system.
To solve the above problems, the utility model is achieved through the following technical solutions：
A kind of mixed carrier modulating system based on wavelet transformation, including transmitting terminal and receiving terminal, wherein transmitting terminal and connect
Receiving end is connected by time-frequency doubly selective channel；Transmitting terminal include baseband modulator, the mixed carrier modulator based on wavelet transformation and
Parallel-to-serial converter；Baseband modulator input data source, the output end of baseband modulator is connected through baseband modulator and become based on small echo
The input of the mixed carrier modulator for changing, the output end of the mixed carrier modulator based on wavelet transformation connects through parallel-to-serial converter
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 connection time-frequency doubly selective channel of deserializer, the output end of deserializer is through wavelet transformer
The input of mixed carrier demodulator of the connection based on wavelet transformation, the output end of the mixed carrier demodulator based on wavelet transformation
Connect the input of base band demodulator, the output end output data of base band demodulator.
In such scheme, the mixed carrier modulator based on wavelet transformation is main to be adjusted by modulation serioparallel exchange module, first
Flip module processed, modulation wavelet transformation module, the second modulation flip module, modulation weighting block and modulation accumulator module composition；
The input for modulating serioparallel exchange module forms the input of the mixed carrier modulator based on wavelet transformation；Modulation serioparallel exchange
The output end of module is divided into 3 tunnels, all the way through the second input of the first modulation flip module connection modulation weighting block, all the way directly
The reset terminal of modulation weighting block is connect in succession, all the way the input of connection modulation wavelet transformation module；Modulation wavelet transformation
The output end of module is divided into 2 tunnels, is directly connected to modulate the first input end of weighting block all the way, all the way through the second modulation turning mould
3rd input of block connection modulation weighting block；4 output ends for modulating weighting block connect modulation accumulator module simultaneously
Input, the output end for modulating accumulator module forms the output end of the mixed carrier modulator based on wavelet transformation.
In such scheme, the mixed carrier demodulator based on wavelet transformation is main by demodulation serioparallel exchange module, the first solution
Adjust flip module, demodulation wavelet transformation module, the second demodulation flip module, demodulation weighting block and demodulation accumulator module composition；
The input for demodulating serioparallel exchange module forms the input of the mixed carrier demodulator based on wavelet transformation；Demodulation serioparallel exchange
The output end of module is divided into 3 tunnels, all the way through the second input of the first demodulation flip module connection demodulation weighting block, all the way directly
The reset terminal of demodulation weighting block is connect in succession, all the way the input of connection demodulation wavelet transformation module；Demodulation wavelet transformation
The output end of module is divided into 2 tunnels, is directly connected to demodulate the first input end of weighting block all the way, all the way through the second demodulation turning mould
3rd input of block connection demodulation weighting block；4 output ends for demodulating weighting block connect demodulation accumulator module simultaneously
Input, the output end for demodulating accumulator module forms the output end of the mixed carrier demodulator based on wavelet transformation.
In such scheme, baseband modulator is dpsk modulators.
In such scheme, base band demodulator is dpsk demodulators.
Compared with prior art, the utility model suppresses double choosings using the mixed carrier modulator approach based on wavelet transformation
ISI/ICI interference problems under channel, it has merged small echo and has changed modulating characteristic with monotropic carrier wave, can simultaneous transmission SC and MC adjust
The signal of system, so as to successfully realize signal rotating freely in time-frequency domain plane.Overloading wave component is to by Doppler frequency shift
Produced ten points of sensitivities of ICI, and the ISI caused by delay spread can produce large effect to single carrier component, but pass through
Change modulation parameter, can effectively reduce influence of two kinds of interference to system.
Brief description of the drawings
Fig. 1 is the system block diagram of the mixed carrier modulating system based on wavelet transformation.
Fig. 2 is the schematic diagram of the mixed carrier modulator approach 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 v=150 kilometers/hour of mixed carrier modulation and conventional multi-carrier performance comparison based on wavelet transformation
Figure.
Specific embodiment
A kind of mixed carrier modulating system based on wavelet transformation, as shown in figure 1, including transmitting terminal and receiving terminal, wherein
Transmitting terminal and receiving terminal are connected by time-frequency doubly selective channel.Transmitting terminal includes that baseband modulator, the mixing based on wavelet transformation are carried
Wave modulator and parallel-to-serial converter.The input input data of baseband modulator, the output end of baseband modulator is through baseband modulation
The input of device mixed carrier modulator of the connection based on wavelet transformation, the output of the mixed carrier modulator based on wavelet transformation
End connects time-frequency doubly selective channel through parallel-to-serial converter.Receiving terminal is including deserializer, wavelet transformer, based on wavelet transformation
Mixed carrier demodulator and base band demodulator.Deserializer input connection time-frequency doubly selective channel, deserializer it is defeated
Go out input of the end through wavelet transformer mixed carrier demodulator of the connection based on wavelet transformation, the mixing based on wavelet transformation is carried
The output end of ripple demodulator connects the input of base band demodulator, the output end output data of base band demodulator.
Mixed carrier modulator based on wavelet transformation is identical with the structure of the mixed carrier demodulator based on wavelet transformation,
As shown in Figure 2.
Mixed carrier modulator based on wavelet transformation it is main by modulation serioparallel exchange module, the first modulation flip module,
Modulation wavelet transformation module, the second modulation flip module, modulation weighting block and modulation accumulator module composition；Modulation serioparallel exchange
The input of module forms the input of the mixed carrier modulator based on wavelet transformation；Modulate the output end of serioparallel exchange module
It is divided into 3 tunnels, all the way through the second input of the first modulation flip module connection modulation weighting block, modulation is directly connected to all the way and is added
The reset terminal of module is weighed, all the way the input of connection modulation wavelet transformation module；Modulate the output end of wavelet transformation module
It is divided into 2 tunnels, is directly connected to modulate the first input end of weighting block all the way, adds through the second modulation flip module connection modulation all the way
Weigh the 3rd input of module；4 output ends for modulating weighting block connect the input of modulation accumulator module simultaneously, and modulation is tired
Plus the output end of module forms the output end of the mixed carrier modulator based on wavelet transformation.
Mixed carrier demodulator based on wavelet transformation it is main by demodulation serioparallel exchange module, the first demodulation flip module,
Demodulation wavelet transformation module, the second demodulation flip module, demodulation weighting block and demodulation accumulator module composition；Demodulation serioparallel exchange
The input of module forms the input of the mixed carrier demodulator based on wavelet transformation；Demodulate the output end of serioparallel exchange module
It is divided into 3 tunnels, all the way through the second input of the first demodulation flip module connection demodulation weighting block, demodulation is directly connected to all the way and is added
The reset terminal of module is weighed, all the way the input of connection demodulation wavelet transformation module；Demodulate the output end of wavelet transformation module
It is divided into 2 tunnels, is directly connected to demodulate the first input end of weighting block all the way, adds through the second demodulation flip module connection demodulation all the way
Weigh the 3rd input of module；4 output ends for demodulating weighting block connect the input of demodulation accumulator module simultaneously, and demodulation is tired
Plus the output end of module forms the output end of the mixed carrier demodulator based on wavelet transformation.
In the utility model, baseband modulator is dpsk modulators, and base band demodulator is dpsk demodulators.
Allow modulated signal in time domain and frequency using the mixed carrier modulation technique based on wavelet transformation in transmitting terminal
It is changed between domain, and because signal is by after the modulation of the mixed carrier based on wavelet transformation of-a ranks, the energy of signal can
Uniformly to distribute, by the way that after channel, the interference of channel can be evenly dispersed on signal, so more there is sentencing using signal
Certainly.In receiving terminal by corresponding demodulation method, data must be recovered by demodulating for a-1 ranks.Improved with this and moved 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 and conventional multi-carrier performance comparison figure based on wavelet transformation.According to wavelet transformation and
Spectrogram contrast after OFDM understands：(1) wavelet transformation possesses spectrum efficiency higher, and by Doppler frequently
Inclined influence 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) the mixed carrier modulation based on wavelet transformation being capable of flexible modulation system modulation order, in actual applications basis
The transmission conditions of channel, can select a preferably modulation order relatively so as to obtain more excellent systematic function.
The utility model is directed to the influence of Doppler shift and multipath faidng to signal transmission quality under high-speed mobile environment,
The advantage of combined with wavelet transformed and single-carrier modulated, double choosing letters are suppressed by the mixed carrier modulator approach based on wavelet transformation
ISI/ICI interference problems under road, so as to improve system transfers performance.
Claims (5)
1. a kind of mixed carrier modulating system based on wavelet transformation, it is characterised in that：Including transmitting terminal and receiving terminal, wherein sending out
Sending end and receiving terminal are connected by time-frequency doubly selective channel；
Transmitting terminal includes baseband modulator, mixed carrier modulator and parallel-to-serial converter based on wavelet transformation；Baseband modulator
Input data source, the output end of baseband modulator is through the defeated of baseband modulator mixed carrier modulator of the connection based on wavelet transformation
Enter end, the output end of the mixed carrier modulator based on wavelet transformation connects time-frequency doubly selective channel through parallel-to-serial converter；
Receiving terminal includes deserializer, wavelet transformer, mixed carrier demodulator and base band demodulator based on wavelet transformation；
The input connection time-frequency doubly selective channel of deserializer, the output end of deserializer is based on small echo through wavelet transformer connection
The input of the mixed carrier demodulator of conversion, the output end connection base band demodulating of the mixed carrier demodulator based on wavelet transformation
The input of device, the output end output data of base band demodulator.
2. a kind of mixed carrier modulating system based on wavelet transformation according to claim 1, it is characterised in that：Based on small
The mixed carrier modulator of wave conversion is main by modulation serioparallel exchange module, the first modulation flip module, modulation WAVELET TRANSFORM MODULUS
Block, the second modulation flip module, modulation weighting block and modulation accumulator module composition；
The input for modulating serioparallel exchange module forms the input of the mixed carrier modulator based on wavelet transformation；Modulation string is simultaneously
The output end of modular converter is divided into 3 tunnels, all the way through the second input of the first modulation flip module connection modulation weighting block, one
Road is directly connected to modulate the reset terminal of weighting block, all the way the input of connection modulation wavelet transformation module；Modulation small echo
The output end of conversion module is divided into 2 tunnels, is directly connected to modulate the first input end of weighting block all the way, is turned over through the second modulation all the way
3rd input of revolving die block connection modulation weighting block；4 output ends for modulating weighting block connect the cumulative mould of modulation simultaneously
The input of block, the output end for modulating accumulator module forms the output end of the mixed carrier modulator based on wavelet transformation.
3. a kind of mixed carrier modulating system based on wavelet transformation according to claim 1, it is characterised in that：Based on small
The mixed carrier demodulator of wave conversion is main by demodulation serioparallel exchange module, the first demodulation flip module, demodulation WAVELET TRANSFORM MODULUS
Block, the second demodulation flip module, demodulation weighting block and demodulation accumulator module composition；
The input for demodulating serioparallel exchange module forms the input of the mixed carrier demodulator based on wavelet transformation；Demodulation string is simultaneously
The output end of modular converter is divided into 3 tunnels, all the way through the second input of the first demodulation flip module connection demodulation weighting block, one
Road is directly connected to demodulate the reset terminal of weighting block, all the way the input of connection demodulation wavelet transformation module；Demodulation small echo
The output end of conversion module is divided into 2 tunnels, is directly connected to demodulate the first input end of weighting block all the way, is turned over through the second demodulation all the way
3rd input of revolving die block connection demodulation weighting block；4 output ends for demodulating weighting block connect the cumulative mould of demodulation simultaneously
The input of block, the output end for demodulating accumulator module forms the output end of the mixed carrier demodulator based on wavelet transformation.
4. a kind of mixed carrier modulating system based on wavelet transformation according to claim 1, it is characterised in that：Base band is adjusted
Device processed is dpsk modulators.
5. a kind of mixed carrier modulating system based on wavelet transformation according to claim 1, it is characterised in that：Base band solution
Tune device is dpsk demodulators.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621416860.4U CN206283528U (en) | 2016-12-22 | 2016-12-22 | A kind of mixed carrier modulating system based on wavelet transformation |
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| CN201621416860.4U CN206283528U (en) | 2016-12-22 | 2016-12-22 | A kind of mixed carrier modulating system based on wavelet transformation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487731A (en) * | 2016-12-22 | 2017-03-08 | 桂林电子科技大学 | A kind of mixed carrier modulator approach based on wavelet transformation and system |
| 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 |
-
2016
- 2016-12-22 CN CN201621416860.4U patent/CN206283528U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487731A (en) * | 2016-12-22 | 2017-03-08 | 桂林电子科技大学 | A kind of mixed carrier modulator approach based on wavelet transformation and system |
| 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 |
| 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 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170627 Termination date: 20191222 |