CN106911449A - A kind of overlapped time division multiplexing modulator approach, apparatus and system - Google Patents
A kind of overlapped time division multiplexing modulator approach, apparatus and system Download PDFInfo
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Abstract
A kind of overlapped time division multiplexing modulator approach, apparatus and system, first according to the design parameter generation initial envelope waveform that waveform is smoothed in time domain, initial envelope waveform is figure base envelope waveform or its envelope waveform for developing window function；Initial envelope waveform is shifted in time domain by predetermined shift intervals according to overlapping multiplexing number of times, is obtained the skew envelope waveform of each moment sending signal；The digital signal sequences of input are converted into sign symbol sequence；Sign symbol sequence after conversion is multiplied with the envelope waveform of each moment sending signal after each skew, the modulation envelope waveform at each moment is obtained；The modulation envelope waveform at each moment is overlapped in time domain, obtains carrying the multiple modulation envelope waveform of output signal sequence.Because the time domain waveform of initial envelope waveform is smoother, frequency domain bandwidth is narrow, and the waveform after superposition is smooth and is limited in narrow bandwidth, therefore improves system spectrum utilization rate and transmission rate, reduces the bit error rate of system.
Description
Technical field
The present invention relates to the communications field, and in particular to a kind of overlapped time division multiplexing modulator approach, device and overlap time-division answer
Use system.
Background technology
So-called time division (hereinafter referred to as time-division) is multiplexed (TDM：Time Division Multiplexing) it is a kind of
Multiple signal codes for occupying narrower duration time are allowed to share the technology of duration time wider in digital communication.Such as
Fig. 1 show the schematic diagram of conventional time-division multiplex technology.
Duration time (being referred to as time slot width in engineering) of the signal code that is respectively re-used in Fig. 1 is respectively T1, T2,
T3, T4 ..., them are generally allowed to occupy identical time slot width in engineering, Δ T is Minimal Protective time slot, real protection time slot
Width should be well-to-do.Δ T should be greater than using the transit time width of demultiplexing gate circuit plus the maximum time of system
Amount of jitter.This is most common time-division multiplex technology.Existing most of multi-path digital broadcast system, multi-path digital communication etc.
What system was used is all this technology.
Maximum feature when this technology is applied to digital communication is in time complete between being multiplexed into signal code
Mutually isolated, will never exist and interfere, the symbol that the signal code to being re-used does not have any limitation, each signal is held
Renewing (time slot width) can have different width, also can be suitably used for different communication systems, as long as their time slot is mutually not
Overlap that intersect just can be with, thus it is most widely used.But this multiplexing, multiplexing in itself to improve system spectrum efficiency in the least
Without effect.
So, traditional viewpoint is not overlapped in time domain between adjacent channel, dry to avoid producing between adjacent channel
Disturb, but the raising of spectrum efficiency of this limitation of the technology.The viewpoint of the time-division multiplex technology of prior art be between each channel not
But need not be mutually isolated, and can have very strong overlapped, as shown in Fig. 2 prior art is by the overlap between channel
It is considered as a kind of new coding bound relation, and corresponding modulation and demodulation technology is proposed according to the restriction relation, therefore is referred to as
It is overlapped time division multiplexing (OvTDM：Overlapped Time Division Multiplexing), this technology causes frequency spectrum
Efficiency is with overlap number of times K proportional increases.
In theory, when being carried out data transmission using overlapped time division multiplexing technology, overlapping number of times K can ad infinitum increase, because
This spectrum efficiency also can ad infinitum increase, but be had been found that with the increase for overlapping number of times K in the laboratory research stage, although frequency spectrum
Efficiency is increased, but transimission power consequently also increases, and the growth of transimission power is also limited to a certain extent in turn
The increase of number of times K is overlapped, so as to also limit the increase of spectrum efficiency.
The content of the invention
The present invention provides a kind of overlapped time division multiplexing modulator approach, apparatus and system, solves initial envelope waveform in frequency
During the broader bandwidth of domain, the waveform after overlapped time division multiplexing superposition is more precipitous in time domain, and frequency domain occupied bandwidth is wider, reduces whole
The availability of frequency spectrum of system and the problem of transmission rate.
According to the application's in a first aspect, this application provides a kind of overlapped time division multiplexing modulator approach, including：
According to the design parameter generation initial envelope waveform that waveform is smoothed in time domain, initial envelope waveform is figure base envelope
Waveform or its envelope waveform for developing window function；
Initial envelope waveform is shifted in time domain by predetermined shift intervals according to overlapping multiplexing number of times, to obtain
The skew envelope waveform of each moment sending signal；
The digital signal sequences of input are converted into sign symbol sequence；
Sign symbol sequence after conversion is multiplied with the skew envelope waveform of each moment sending signal after skew, with
To the modulation envelope waveform at each moment；
The modulation envelope waveform at each moment is overlapped in time domain, to obtain carrying the polyphony of output signal sequence
Envelope waveform processed.
According to the second aspect of the application, present invention also provides a kind of overlapped time division multiplexing modulating device, including：
Waveform generating module, for generating the smooth initial envelope waveform of waveform in time domain according to design parameter, initially
Envelope waveform is figure base envelope waveform or its envelope waveform for developing window function；
Shift module, for being entered initial envelope waveform by predetermined shift intervals in time domain according to overlapping multiplexing number of times
Row displacement, to obtain the skew envelope waveform of each moment sending signal；
Modulation module, for the digital signal sequences of input to be converted into sign symbol sequence；
Multiplier module, for the skew envelope of each moment sending signal after the sign symbol sequence that will be input into and skew
Waveform is multiplied, to obtain the modulation envelope waveform at each moment；
Laminating module, for the modulation envelope waveform at each moment to be overlapped in time domain, to obtain carrying output
The multiple modulation envelope waveform of signal sequence.
According to the third aspect of the application, present invention also provides a kind of overlapped time division multiplexing modulation demodulation system, including
Transmitter and receiver；
The emitter includes：
Above-mentioned overlapped time division multiplexing modulating device, the multiple modulation envelope waveform of output signal sequence is carried for generating；
Emitter, for the multiple modulation envelope waveform to be transmitted into receiver；
The receiver includes：
Reception device, the multiple modulation envelope waveform for receiving the emitter transmitting；
Sequence detecting apparatus, for carrying out the data sequence detection in time domain to the multiple modulation envelope waveform for receiving, to enter
Row judgement output.
In overlapped time division multiplexing modulator approach, apparatus and system that the present invention is provided, due to the time domain of initial envelope waveform
Waveform is smoother, and frequency domain bandwidth is narrower, and the waveform after superposition is smoother and is limited in narrower bandwidth, therefore improves system
The availability of frequency spectrum and transmission rate, reduce the bit error rate of system.
Brief description of the drawings
Fig. 1 is the schematic diagram of conventional time-division multiplex technology；
Fig. 2 is overlap time division multiplexing principle schematic diagram；
Fig. 3 is the structural representation of overlapped time division multiplexing system in an embodiment of the present invention；
Fig. 4 is the structural representation of overlapped time division multiplexing modulating device in an embodiment of the present invention；
Fig. 5 is the hardware architecture diagram of overlapped time division multiplexing modulating device in an embodiment of the present invention；
Fig. 6 is the structural representation of receiver pretreatment unit in an embodiment of the present invention；
Fig. 7 is the structural representation of receiver sequence detecting apparatus in an embodiment of the present invention；
Fig. 8 is the time domain waveform and frequency-domain waveform figure of figure base envelope waveform in an embodiment of the present invention；
Fig. 9 is the envelope waveform figure at figure base window shifted rear each moment in an embodiment of the present invention；
Figure 10 A be an embodiment of the present invention in R=0.1 when using figure base envelope waveform when waveform to be sent superposition show
It is intended to；
Figure 10 B be an embodiment of the present invention in R=0.5 when using figure base envelope waveform when waveform to be sent superposition show
It is intended to；
Figure 10 C be an embodiment of the present invention in R=0.9 when using figure base envelope waveform when waveform to be sent superposition show
It is intended to；
Figure 11 is the principle schematic of K roads waveform multiplexing；
Figure 12 is the symbol additive process principle schematic of K roads waveform；
The Input output Relationship tree graph of overlapped time division multiplexing system when Figure 13 is K=3；
Figure 14 is node state transfer relationship figure；
Figure 15 is the time domain and frequency-domain waveform figure of square wave；
Figure 16 is the oscillogram after envelope waveform selects each signal generated during square wave envelope waveform and is superimposed.
Specific embodiment
The present invention is described in further detail below by specific embodiment combination accompanying drawing.
In to overlapping time-division multiplex technology research, inventor has found that the growth of transimission power is main with the signal that is re-used
The frequency spectrum of (modulating window function) is relevant, and the shape to multiplexed signals frequency spectrum not as contemplated by theory, bandwidth are not appointed
What is required.Although there are many window functions in the prior art, transmission symbol can be carried out using various window functions freely in theory
Modulation, but due to rectangular window compared to other window functions producing, design and application it is upper be easier, cost it is lower, therefore at present
Rectangular window preferentially is used when signal modulation is carried out, and the spectral bandwidth of square wave is wider, multiplexing waveform systematic function is very poor, leads
Transimission power and the bit error rate needed for causing is all very high.
Based on above-mentioned discovery, in embodiments of the present invention, square is better than using a kind of in application overlapped time division multiplexing technology
The window function of shape ripple is modulated to the digital signal sequences being input into.
Fig. 3 is refer to, overlapped time division multiplexing system includes signal transmitter A01 and receiver A02.
Emitter A01 includes overlapped time division multiplexing modulating device 101 and emitter 102.Overlapped time division multiplexing modulation dress
Put 101 for generate carrying output signal sequence multiple modulation envelope waveform；Emitter 102 is used for the multiple modulation Envelop waves
Shape is transmitted into receiver A02.
Receiver A02 includes reception device 201 and sequence detecting apparatus 202.Reception device 201 is used for receiving and transmitting unit
The multiple modulation envelope waveform of 102 transmittings；Sequence detecting apparatus 202 are used to carry out in time domain the multiple modulation envelope waveform for receiving
Data sequence is detected, to make decisions output.
Preferably, receiver A02 also includes the pretreatment being arranged between reception device 201 and sequence detecting apparatus 202
Device 203, the synchronous reception digital signal sequences for aiding in being formed each frame in.
In emitter A01, the digital signal sequences of input form multiple symbols by overlapped time division multiplexing modulating device 101
Number overlapped transmission signal in time domain, then the transmission signal is transmitted into receiver A02 by emitter 102.Receive
The signal of the transmitting of 201 receiving and transmitting unit of reception device 102 of machine A02, forms by pretreatment unit 203 and is adapted to Sequence Detection
Device 202 detect the data signal of reception, and the docking collection of letters number of sequence detecting apparatus 202 carries out the data sequence inspection in time domain
Survey, so as to export judgement.
Refer to Fig. 4, overlapped time division multiplexing modulating device 101 (OvTDM modulating devices) include waveform generating module 301,
Shift module 302, multiplier module 303 and laminating module 304.
Waveform generating module 301 is used for according to the design parameter generation initial envelope waveform that waveform is smoothed in time domain.
Shift module 302 is used to that initial envelope waveform to be pressed into predetermined shift intervals in time domain according to overlapping multiplexing number of times
Shifted, to obtain the skew envelope waveform of each moment sending signal.
Modulation module 305 is used to for the digital signal sequences of input to be converted into sign symbol sequence.
Multiplier module 303 is used for the skew bag of each moment sending signal after the sign symbol sequence after conversion and skew
Network waveform is multiplied, to obtain the modulation envelope waveform at each moment.
Laminating module 304 is used to be overlapped the modulation envelope waveform at each moment in time domain, to obtain carrying defeated
Go out the multiple modulation envelope waveform of signal sequence.
With reference to overlapped time division multiplexing modulator approach, overlapped time division multiplexing modulating device 101 is described further, weight
Folded time division multiplex modulator approach includes below step：
(1) waveform generating module 301 generates smooth initial envelope waveform h (t) of waveform in time domain according to design parameter.
When initial envelope waveform is generated, can be by user input design parameter, to realize basis in systems in practice
System performance index flexible configuration.
In certain embodiments, when the side lobe attenuation of initial envelope waveform has determined, design parameter includes initial bag
The window length L of network waveform, such as when initial envelope waveform is Bart's Lay spy's envelope waveform.
In certain embodiments, design parameter includes the window length L and side lobe attenuation r of initial envelope waveform, for example originally
When beginning envelope waveform is Chebyshev's envelope waveform.
Certainly, when initial envelope waveform is other forms, can be determined to set according to the characteristics of corresponding initial envelope waveform
Meter parameter.
(2) initial envelope waveform is pressed predetermined shift intervals by shift module 302 according to overlapping multiplexing number of times K in time domain
Shifted, to obtain the skew envelope waveform h (t-i* △ T) of each moment sending signal.
Wherein, shift intervals are for time interval △ T, time interval △ T：△ T=L/K.
In addition, in addition it is also necessary to ensure inverses of the △ T not less than systematic sampling rate.
The value of i is relevant with incoming symbol length N, and i takes 0 to N-1 integer.For example, as N=8, i takes 0 to 7
Integer.
(3) digital signal sequences of input are converted into sign symbol sequence by modulation module 305.
Specifically, 0 in the digital signal sequences of input is converted to+1,1 by modulation module 305 is converted to -1, to obtain
Sign symbol sequence.For example, { 0, the 1 } bit sequence that will be input into is by BPSK, and (Binary Phase Shift Keying are moved
Phase keying) modulation conversion is into {+1, -1 } symbol sebolic addressing.
(4) multiplier module 303 is by the sign symbol sequence x after conversioniWith the skew of each moment sending signal after skew
Envelope waveform h (t-i* △ T) is multiplied, to obtain the modulation envelope waveform x at each momentih(t-i*△T)。
(5) laminating module 304 is by the modulation envelope waveform x at each momentiH (t-i* △ T) is overlapped in time domain, with
Obtain carrying the multiple modulation envelope waveform of output signal sequence, that is, the signal for sending.
The signal of transmission can be expressed as below：
Because the time domain waveform of initial envelope waveform is smoother, frequency domain bandwidth is narrower, and the waveform after superposition is smoother and limits
It is scheduled in narrower bandwidth, therefore improves the availability of frequency spectrum and transmission rate of system, reduces the bit error rate of system.
Fig. 5 is refer to, specifically, overlapped time division multiplexing modulating device 101 can be realized by following hardware cell.During overlap
Dividing multiplexing modulating device 101 includes digital waveform generator 401, shift register 402, modulator 403, multiplier 404 and adds
Musical instruments used in a Buddhist or Taoist mass 405.
First phase wiggles of initial envelope waveform is formed by digital waveform generator 401 in a digital manner first, should
Initial envelope waveform is smoothed in time domain；Again produced digital waveform generator 401 by shift register 402 first is initial
The phase wiggles of envelope waveform are shifted, to produce the skew envelope waveform of each moment sending signal；Then, modulator
The digital signal sequences of input are converted into sign symbol sequence by 403, multiplier 404 then by the sign symbol sequence after conversion with
The skew envelope waveform of each moment sending signal is multiplied after skew, to obtain the modulation envelope waveform at each moment；It is last by
In time domain be overlapped the modulation envelope waveform at each moment by adder 405, to obtain carrying answering for output signal sequence
Modulation envelope waveform, forms transmission signal.
Fig. 6 is refer to, is the block diagram of the pretreatment unit 203 of receiver A02 in the embodiment of the present invention.
Pretreatment unit 203 includes synchronizer 501, channel estimator 502 and digital processor 503.Wherein synchronizer
The 501 docking collections of letters number form a symbol time synchronization in receiver；Then channel estimator 502 is estimated channel parameter；
Digital processor 503 is digitized treatment to the reception signal of each frame in, so as to form suitable sequence detecting apparatus enter
The digital signal sequences that row Sequence Detection is received.
Fig. 7 is refer to, is the block diagram of the sequence detecting apparatus 202 of receiver A02 in the embodiment of the present invention.
Sequence detecting apparatus 202 include analytic unit memory 601, comparator 602 and multiple surviving path memories 603
With Euclidean distance memory 604 or weighted euclidean distance memory (not shown).In detection process, analytic unit storage
Device 601 makes the complex convolution encoding model and trellis structure of overlapped time division multiplexing system, and lists overlapped time division multiplexing system
Whole states, and store；And trellis structure of the comparator 602 in analytic unit memory 601, search out and receive numeral letter
The path of number minimum Eustachian distance or weighting minimum Eustachian distance；And surviving path memory 603 and Euclidean distance memory 604
Or weighted euclidean distance memory is then respectively used to store the surviving path and Euclidean distance or weighted Euclidean of the output of comparator 602
Distance.Wherein, surviving path memory 603 and Euclidean distance memory 604 or weighted euclidean distance memory are needed for each
Individual stable state respectively prepares one.The length of surviving path memory 603 can be preferably 4K~5K.Euclidean distance memory 604
Or weighted euclidean distance memory is preferably only storage relative distance.
In the present embodiment, initial envelope waveform is figure base (Tukey) envelope waveform or its envelope waveform for developing window function.
The application is described further with initial envelope waveform as figure base (Tukey) envelope waveform then below.Wherein,
Overlapping multiplexing number of times K=3, incoming symbol length N=8, incoming symbol xiIllustrated as a example by={+1+1-1-1-1+1-1+1 }
The signal of OvTDM sends and receives process.Wherein, incoming symbol length refers to the length for sending a frame signal.
Fig. 5 is refer to, signal generation process includes below step：
(1) figure base (Tukey) envelope waveform h (t) of sending signal is generated according to design parameter first.
In the present embodiment in design parameter, window length L=63 is respectively as a example by 0.1,0.5,0.9, its time domain waveform by R
With frequency-domain waveform as shown in Figure 8.Wherein, R is ratio of the conical region to steady state value, and value is 0~1, when R takes extreme value,
Figure base (Tukey) window will develop into other general windows.R=1, figure base (Tukey) window is equivalent to Hanning window；R=0, figure base
(Tukey) window is equivalent to rectangular window.
As can be seen from Figure 8, by 0, with the increase of R, conical region is more and more, waveform for time domain waveform starting point
Increasingly smooth；Frequency-domain waveform side lobe attenuation is more and more faster, thus superposition after performance it is more excellent.
Specifically, for figure base (Tukey) window function, it can be represented by formula below：
Wherein, the α in formula is above-mentioned R values.It should be noted that the function in x only representation formulas in above-mentioned formula
Variable.
(2) figure base (Tukey) envelope waveform h (t) designed by (1) is moved in time domain by predetermined shift intervals
Position, wherein, shift intervals are time interval △ T (△ T=L/K=21).After displacement, the skew of each moment sending signal is formed
Envelope waveform h (t-i* △ T) (due to N=8, thus i be integer and value be 0~7), each moment sending signal after displacement
Skew envelope waveform figure is as shown in Figure 9.
(3) digital signal sequences of input are converted into sign symbol sequence.
Specifically, 0 in the digital signal sequences of input can be converted into+A, 1 is converted to-A, to obtain sign symbol
Sequence.For example, taking A=1, { 0, the 1 } bit sequence that will be input into is by BPSK modulation conversions into {+1, -1 } symbol sebolic addressing.
(4) by sign symbol sequence xi(x in the present embodimenti={+1+1-1-1-1+1-1+1 }) with (2) generation each when
The skew envelope waveform h (t-i* △ T) for carving sending signal is multiplied, and obtains the modulation envelope waveform x at each momentih(t-i*△
T)；Waveform after formation is as shown in Figure 10, wherein three different dotted lines represent three oscillograms after being multiplied.
(5) the modulation envelope waveform x at each moment for being formed (4)iH (t-i* △ T) is overlapped in time domain, with
Obtain carrying the multiple modulation envelope waveform of output signal sequence, that is, the signal for sending.Reality in transmission signal oscillogram such as Figure 10
Shown in line waveform.
The signal of transmission can be expressed as：
Specifically, output signal sequence is determined by following mode：
When modulation envelope waveform is multiplied by plus sign with the moment envelope waveform to be obtained, the fortune of the modulation envelope waveform is made
Calculation value is+1, when modulation envelope waveform is multiplied by minus symbol with the moment envelope waveform to be obtained, makes the modulation envelope waveform
Operation values are -1.For each shift intervals, the operation values superposition of the modulation envelope waveform that will be located in the shift intervals draws
The output signal of the shift intervals, so as to form output signal sequence.
Therefore, in the present embodiment, the output symbol (output signal sequence) after superposition is：S (t)={+1+2+1-1-3-1-
1+1}。
Figure 11 is refer to, is the principle schematic of K roads waveform multiplexing, its parallelogram shape.Wherein, per a line table
Show a symbol x to be sentiThe signal wave to be sent obtained after being multiplied with the envelope waveform h (t-i* △ T) at corresponding moment
Shape xih(t-i*△T)。a0~ak-1Expression carries out every part that K segmentation is obtained to each window function waveform (envelope waveform)
Coefficient value, the specially coefficient on range value.
During due to the digital signal sequences of input being converted into sign symbol sequence, in the digital signal sequences that will be input into
0 is converted to+1,1 is converted to -1, to obtain sign symbol sequence.For example, { 0, the 1 } bit sequence that will be input into is modulated by BPSK
{+1, -1 } symbol sebolic addressing is converted into, to obtain sign symbol sequence.So the symbol that K roads waveform is shown in Figure 12 was superimposed
Journey principle schematic.In Figure 12 additive processes, the number of the 1st row left side 3 represents the 1st incoming symbol+1, the number of the 2nd row left side 3
The 2nd incoming symbol+1 is represented, the number of the 3rd row left side 3 represents that 3 numbers represent the 4th in the middle of the 3rd incoming symbol -1st, the 1st row
Incoming symbol -1, in the middle of the 2nd row 3 numbers represent in the middle of the 5th incoming symbol -1st, the 3rd row 3 numbers represent the 6th incoming symbol+
1, the 1st row the right, 3 numbers represent the 7th incoming symbol -1st, and 3 numbers of the 2nd row the right represent the 8th incoming symbol+1.Therefore, three
After individual addition of waveforms, the output symbol for obtaining is {+1+2+1-1-3-1-1+1 }.
Certainly, if the length of incoming symbol is other numerical value, can be carried out according to the mode shown in Figure 11 and Figure 12
Superposition, to obtain output symbol.
Figure base (Tukey) window in R=0.1, by 0, compared square wave and smoothed its time domain by the waveform after superposition,
And frequency domain side lobe decay compares square wave soon, frequency domain bandwidth is narrower so that the waveform frequency spectrum efficiency after superposition is higher, sending signal
Required transimission power is relatively low.The numerical value of figure base (Tukey) window R can be designed with oneself according to system performance index again, with R's
Increase, waveform can gradually level off to Hanning window, and the waveform after superposition can be smoothed increasingly, in systems in practice needed for transmission signal
Power it is more and more lower, coding/decoding capability can be increasingly stronger, designs flexible compared with square wave.
Fig. 6 and Fig. 7 is refer to, signal receives process includes below step：
(1) the docking collection of letters number first is synchronized, including the synchronization of carrier synchronization, frame synchronization, symbol time etc..
(2) according to sampling theorem, the reception signal to each frame in is digitized treatment.
(3) waveform for receiving is cut according to waveform transmission time interval.
(4) the data sequence detection in time-domain is carried out to the signal for receiving, to make decisions output, i.e., according to certain
Decoding algorithm enters row decoding to the waveform after cutting.
By after the pre-treatment step of above-mentioned (1)~(2), the reception symbol sebolic addressing obtained after waveform cutting is：S (t)=
{+1+2+1-1-3-1-1+1 }, to symbol sebolic addressing according to the tree graph and Fig. 8 node state transfer relationships of Fig. 7 Input output Relationships
Figure, carry out between symbol before and after compare, obtain node transfer path.
In Figure 13, upward branch is+1 input, and downward branch is -1 input.The tree graph is reformed into after the 3rd
Repeat, because the branch that every node from labeled as a gives off has same output, the conclusion is to node b, c, d
It is equally applicable.They can only as can be seen from Figure 14 be transferred to nothing more than being several possibility as shown in figure 14 from node a
(through input+1) node a and (through input -1) node b, while b can only arrive (input+1) c and (input -1) d, c can only arrive (input
+ 1) a and (input -1) b, d can only arrive (input+1) c and (input -1) d.The reason for producing this phenomenon is very simple, because only that
The individual symbol of adjacent K (being 3 specific to this example) can just be formed and interfered.So when K data are input to channel, coming earliest
The 1st data have moved out a shift unit of rightmost.Therefore the output of channel is except depending on current moment data
Input, further depend on the input of preceding K-1 data.
Node state transfer in present case is such as blackening shown in thick line in Figure 13, due to first symbol of s (t)+
1, so node transfer path is：+1->a->a->b->d->d->c->b->C, input can be obtained according to this transfer relationship
Symbol sebolic addressing is {+1+1-1-1-1+1-1+1 }.
In the present embodiment, because figure base (Tukey) envelope waveform is smoother in time domain, and side lobe attenuation is very fast, therefore
Required transimission power is relatively low, and precision is higher when being cut to waveform, and the symbol sebolic addressing degree of accuracy for receiving is more preferable.
Figure 15 is refer to, is the time domain and frequency-domain waveform figure of square wave.When initial envelope waveform selects square wave Envelop waves
During shape, then the oscillogram after each signal generated according to above-mentioned signal generation process and superposition is as shown in figure 16, wherein three
The different dotted line of bar represents three oscillograms, and solid line represents the oscillogram after superposition.
As can be seen from Figure 16, square wave in time domain by 1, and broader bandwidth, the side lobe attenuation on frequency domain
Slowly, the waveform therefore after time domain superposition is unsmooth, and frequency domain bandwidth is wider, and useful signal and invalid signals are difficult to differentiate between so that
Transimission power required during sending and receiving signal increases, and the accuracy rate and volume for receiving waveform cutting in signal process are solved
Code ability reduction.Transmission rate is identical in systems in practice and spectrum efficiency identical in the case of, it is required during using square wave
Transimission power and the bit error rate are all very high.
But figure base (Tukey) window used in the present embodiment waveform after time domain superposition is smooth compared with square wave, secondary lobe declines
Subtract very fast, frequency domain bandwidth is narrower, improves the accuracy rate of waveform cutting process and the error correcting capability of encoding-decoding process, reduces letter
Number transimission power so that in the timing of spectrum efficiency one, transmission rate very high can be just reached using relatively low transimission power.Again
The numerical value of figure base (Tukey) window R can be designed with oneself according to system performance index, and with the increase of R, the waveform after superposition can be more
Come more smooth, the power needed for transmission signal is more and more lower in systems in practice, coding/decoding capability can be increasingly stronger, designs compared with square
Shape ripple is flexible.
In addition, in other embodiments, initial envelope waveform is also an option that various to scheme the differentiation of base (Tukey) window function
Function envelope waveform, multiply including the company of figure base (Tukey) pulse-shaping, function etc. all-order derivative, all-order derivative sum
Envelope waveform, these envelope waveforms in time domain it is same with waveform it is smooth the characteristics of, therefore using after these envelope waveforms
The effect close with figure base (Tukey) envelope waveform is used can be reached.
Overlapped time division multiplexing modulator approach, the apparatus and system that the present invention is provided are because initial envelope waveform is put down in time domain
It is sliding so that the waveform after superposition is smoothed, so that the transimission power of system linearly slowly increases, the availability of frequency spectrum is improve indirectly
And transmission rate.The overlapped time division multiplexing modulator approach, apparatus and system may apply to mobile communication, satellite communication, microwave
In the wireless communication systems such as horizon communication, scatter communication, atmosphere optic communication, infrared communication, underwater sound communication, both can apply to
Large Copacity is wirelessly transferred, it is also possible to be applied to the light-duty radio system of low capacity.
It will be understood by those skilled in the art that all or part of step of various methods can pass through in above-mentioned implementation method
Program instructs related hardware to complete, and the program can be stored in a computer-readable recording medium, storage medium can be wrapped
Include：Read-only storage, random access memory, disk or CD etc..
Use above specific case is illustrated to the present invention, is only intended to help and understands the present invention, is not used to limit
The system present invention.For those skilled in the art, according to thought of the invention, can also make some simple
Deduce, deform or replace.
Claims (11)
1. a kind of overlapped time division multiplexing modulator approach, it is characterised in that including：
The smooth initial envelope waveform of waveform in time domain is generated, initial envelope waveform is figure base envelope waveform or its differentiation window letter
Several envelope waveforms；
Initial envelope waveform is shifted in time domain by predetermined shift intervals according to overlapping multiplexing number of times, to obtain each
The skew envelope waveform of moment sending signal；
The digital signal sequences of input are converted into sign symbol sequence；
Sign symbol sequence after conversion is multiplied with the skew envelope waveform of each moment sending signal after skew, it is each to obtain
The modulation envelope waveform at individual moment；
The modulation envelope waveform at each moment is overlapped in time domain, to obtain carrying the multiple modulation bag of output signal sequence
Network waveform.
2. the method for claim 1, it is characterised in that the shift intervals are time interval Δ T, time interval Δ T
For：
Δ T=L/K
Wherein, to overlap multiplexing number, value is non-zero positive number to K；L is the window length of initial envelope waveform.
3. method as claimed in claim 2, it is characterised in that inverses of the Δ T not less than systematic sampling rate.
4. the method for claim 1, it is characterised in that the digital signal sequences of input are converted into sign symbol sequence
Specially：In the digital signal sequences of input 0 is converted into+A, 1 is converted to-A, to obtain sign symbol sequence, wherein A's
Value is non-zero Arbitrary Digit.
5. the method for claim 1, it is characterised in that the output signal sequence is determined by following mode：
When modulation envelope waveform is multiplied by plus sign with the skew envelope waveform at the moment to be obtained, the modulation envelope waveform is made
Operation values are+A, when modulation envelope waveform is multiplied by minus symbol with the envelope waveform at the moment to be obtained, make the modulation envelope ripple
The operation values of shape are-A；；Wherein the value of A is non-zero Arbitrary Digit；
For each shift intervals, the operation values superposition of the modulation envelope waveform that will be located in the shift intervals draws the displacement
The output signal at interval, so as to form output signal sequence.
6. a kind of overlapped time division multiplexing modulating device, it is characterised in that including：
Waveform generating module, for generating the smooth initial envelope waveform of waveform in time domain, initial envelope waveform is Tu Jibao
Network waveform or its envelope waveform for developing window function；
Shift module, for being moved initial envelope waveform by predetermined shift intervals in time domain according to overlapping multiplexing number of times
Position, to obtain the skew envelope waveform of each moment sending signal；
Modulation module, for the digital signal sequences of input to be converted into sign symbol sequence；
Multiplier module, for by the sign symbol sequence after conversion with skew after each moment sending signal skew envelope waveform
It is multiplied, to obtain the modulation envelope waveform at each moment；
Laminating module, for the modulation envelope waveform at each moment to be overlapped in time domain, to obtain carrying output signal
The multiple modulation envelope waveform of sequence.
7. the device described in claim 6, it is characterised in that the shift intervals are time interval Δ T, time interval Δ T is：
Δ T=L/K
Wherein, to overlap multiplexing number, value is non-zero positive number to K；L is the window length of initial envelope waveform.
8. the device described in claim 7, it is characterised in that inverses of the Δ T not less than systematic sampling rate.
9. the device described in claim 6, it is characterised in that modulation module is used to be converted into the digital signal sequences of input just
During minus symbol sequence：Modulation module is used to for 0,1 in the digital signal sequences of input to be converted to ± A, and A values are non-zero any
Number, to obtain sign symbol sequence.
10. the device described in claim 6, it is characterised in that the output signal sequence that multiple modulation envelope waveform is carried is by each shifting
The output signal composition of bit interval, the output signal of each shift intervals is the operation values of the modulation envelope waveform in each shift intervals
Result after superposition, when modulation envelope waveform is multiplied by plus sign with the envelope waveform at the moment to be obtained, its operation values is+A,
It is multiplied with the envelope waveform at the moment by minus symbol when obtaining, its operation values is-A, A values are non-zero Arbitrary Digit.
11. a kind of overlapped time division multiplexing modulation demodulation systems, it is characterised in that including transmitter and receiver；
The emitter includes：
Overlapped time division multiplexing modulating device as described in claim any one of 6-10, output signal sequence is carried for generating
Multiple modulation envelope waveform；
Emitter, for the multiple modulation envelope waveform to be transmitted into receiver；
The receiver includes：
Reception device, the multiple modulation envelope waveform for receiving the emitter transmitting；
Sequence detecting apparatus, for carrying out the data sequence detection in time domain to the multiple modulation envelope waveform for receiving, to be sentenced
Certainly export.
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| CN201510977028.5A CN106911449A (en) | 2015-12-23 | 2015-12-23 | A kind of overlapped time division multiplexing modulator approach, apparatus and system |
| PCT/CN2016/111405 WO2017107938A1 (en) | 2015-12-23 | 2016-12-22 | Overlapped multiplexing modulation method, apparatus and system |
| JP2018552107A JP6704470B2 (en) | 2015-12-23 | 2016-12-22 | Overlap multiplex modulation method, apparatus and system |
| EP16877748.0A EP3396891A4 (en) | 2015-12-23 | 2016-12-22 | Overlapped multiplexing modulation method, apparatus and system |
| KR1020187019865A KR102277047B1 (en) | 2015-12-23 | 2016-12-22 | A kind of superposition multiplexing modulation method, apparatus and system |
| US16/017,012 US10630408B2 (en) | 2015-12-23 | 2018-06-25 | Overlapped multiplexing modulation method, apparatus and system |
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