CN106911459A - 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 Berman 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 multiplex system.
Background technology
So-called time division (hereinafter referred to as time-division) is multiplexed (TDM：Time Division Multiplexing)
It is that a kind of signal codes for allowing multiple to occupy narrower duration time in digital communication share a time wider
The technology of duration.It is as shown in Figure 1 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 protected for minimum
Shield time slot, real protection time slot width should be well-to-do.Δ T should be greater than using the mistake of demultiplexing gate circuit
Cross maximum time amount of jitter of the time width plus system.This is most common time-division multiplex technology.It is existing exhausted
What the systems such as most multi-path digital broadcast system, multi-path digital communication were used is all this technology.
Maximum feature when this technology is applied to digital communication is multiplexed between signal code
It is completely insulated from each other, will never exists and interfere, the signal code to being re-used does not have any limitation,
The symbol duration (time slot width) of each signal can have different width, also can be suitably used for different communications
System, if their time slot do not overlap each other intersection just can be with, it is therefore most widely used.But this
Multiplexing is planted, multiplexing is like water off a duck's back to improving the spectrum efficiency of system in itself.
So, traditional viewpoint is not overlapped in time domain between adjacent channel, to avoid between adjacent channel
Produce interference, but the raising of spectrum efficiency of this limitation of the technology.The sight of the time-division multiplex technology of prior art
Point is not only need not be mutually isolated between each channel, and can have very strong overlapped, such as Fig. 2 institutes
Show, the overlap between channel is considered as a kind of new coding bound relation by prior art, and is closed according to the constraint
System proposes corresponding modulation and demodulation technology, therefore referred to as overlapped time division multiplexing (OvTDM：
Overlapped Time Division Multiplexing), this technology cause spectrum efficiency with overlap number of times K into
The increase of ratio.
In theory, when being carried out data transmission using overlapped time division multiplexing technology, overlapping number of times K can be ad infinitum
Increase, therefore spectrum efficiency also can ad infinitum increase, but had been found that in the laboratory research stage secondary with overlapping
The increase of number K, although spectrum efficiency is increased, but transimission power consequently also increases, and transimission power
Increase the increase that also limit to a certain extent overlap number of times K in turn, so as to also limit frequency spectrum effect
The increase of rate.
The content of the invention
The present invention provides a kind of overlapped time division multiplexing modulator approach, apparatus and system, solves initial Envelop waves
, when frequency domain bandwidth is wider, the waveform after overlapped time division multiplexing superposition is more precipitous in time domain, and frequency domain takes band for shape
It is wider, reduce the availability of frequency spectrum of whole 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 primary
Graceful 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；
By the sign symbol sequence after conversion with skew after each moment sending signal skew envelope waveform phase
Multiply, to obtain the modulation envelope waveform at each moment；
The modulation envelope waveform at each moment is overlapped in time domain, to obtain carrying output signal sequence
Multiple modulation envelope waveform.
According to the second aspect of the application, present invention also provides a kind of overlapped time division multiplexing modulating device, bag
Include：
Waveform generating module, for generating the smooth initial envelope waveform of waveform in time domain according to design parameter,
Initial envelope waveform is Berman envelope waveform or its envelope waveform for developing window function；
Shift module, for initial envelope waveform to be pressed into predetermined displacement in time domain according to overlapping multiplexing number of times
Interval is shifted, 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 will be input into sign symbol sequence with offset after each moment sending signal it is inclined
Move envelope waveform to be 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 be taken
Multiple modulation envelope waveform with output 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 Envelop waves of output signal sequence are carried for generating
Shape；
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 make decisions output.
In overlapped time division multiplexing modulator approach, apparatus and system that the present invention is provided, due to initial envelope waveform
Time domain waveform it is smoother, frequency domain bandwidth is narrower, and the waveform after superposition is smoother and is limited in narrower bandwidth,
Therefore the availability of frequency spectrum and transmission rate of system are improve, the bit error rate of system is reduced.
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 Berman envelope waveform in an embodiment of the present invention；
Fig. 9 is the envelope waveform figure at Berman window shifted rear each moment in an embodiment of the present invention；
The superposition of waveform to be sent is illustrated when Figure 10 is in an embodiment of the present invention using Berman envelope waveform
Figure；
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 waveform after envelope waveform selects each signal generated during square wave envelope waveform and is superimposed
Figure.
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 being re-used
The frequency spectrum of signal (modulating window function) is relevant, not as contemplated by theory to multiplexed signals frequency spectrum
Shape, bandwidth have no requirement.Although there are many window functions in the prior art, can freely adopt in theory
With various window functions to transmission symbol be modulated, but due to rectangular window compared to other window functions produce,
Design and application it is upper be easier, cost it is lower, therefore preferentially use rectangular window when signal modulation is carried out at present,
And the spectral bandwidth of square wave is wider, multiplexing waveform systematic function is very poor, causes required transimission power and mistake
Code check is all very high.
Based on above-mentioned discovery, in embodiments of the present invention, in application overlapped time division multiplexing technology using one kind
Window function better than square wave 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.Overlap the time-division multiple
It is used to generate the multiple modulation envelope waveform for carrying output signal sequence with modulating device 101；Emitter 102
For the multiple modulation envelope waveform to be transmitted into receiver A02.
Receiver A02 includes reception device 201 and sequence detecting apparatus 202.Reception device 201 is used to connect
The multiple modulation envelope waveform of the transmitting-receiving transmitting of injection device 102；Sequence detecting apparatus 202 are used for the polyphony to receiving
Envelope waveform processed carries out the data sequence detection in time domain, to make decisions output.
Preferably, receiver A02 also includes being arranged between reception device 201 and sequence detecting apparatus 202
Pretreatment unit 203, receive digital signal sequences for aiding in forming the synchronous of each frame in.
In emitter A01, the digital signal sequences of input pass through the shape of overlapped time division multiplexing modulating device 101
Into the overlapped transmission signal in time domain of multiple symbols, then the transmission signal is sent out by emitter 102
It is mapped to receiver A02.The signal of the transmitting of 201 receiving and transmitting unit of reception device 102 of receiver A02,
Forming suitable sequence detecting apparatus 202 by pretreatment unit 203 detect the data signal of reception, sequence
The docking collection of letters number of row detection means 202 carries out the data sequence detection in time domain, so as to export judgement.
Fig. 4 is refer to, overlapped time division multiplexing modulating device 101 (OvTDM modulating devices) is given birth to including waveform
Into 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 Envelop waves that waveform is smoothed in time domain
Shape.
Shift module 302 is used to that initial envelope waveform to be pressed into predetermined shifting in time domain according to overlapping multiplexing number of times
Bit interval is 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 each moment sending signal after the sign symbol sequence after conversion and skew
Skew envelope 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
Carry the multiple modulation envelope waveform of output signal sequence.
With reference to overlapped time division multiplexing modulator approach, overlapped time division multiplexing modulating device 101 is done further
Illustrate, overlapped time division multiplexing modulator approach includes below step：
(1) waveform generating module 301 generates the smooth initial Envelop waves of waveform in time domain according to design parameter
Shape h (t).
When initial envelope waveform is generated, can be by user input design parameter, to realize in real system
It is middle according to system performance index flexible configuration.
In certain embodiments, when the side lobe attenuation of initial envelope waveform has determined, design parameter includes
The window length L of initial envelope 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, example
Such as when initial envelope waveform is Chebyshev's envelope waveform.
Certainly, when initial envelope waveform is other forms, can be according to the characteristics of corresponding initial envelope waveform
Determine design parameter.
(2) initial envelope waveform is pressed predetermined by shift module 302 according to overlapping multiplexing number of times K in time domain
Shift intervals are 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, working as N=8
When, 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+A by modulation module 305,1 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 (Binary
Phase Shift Keying, phase-shift keying) modulation conversion is into {+1, -1 } symbol sebolic addressing.
(4) multiplier module 303 is by the sign symbol sequence x after conversioniWith each moment sending signal after skew
Skew envelope waveform h (t-i* △ T) be 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 folded in time domain
Plus, to 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 relatively put down
Slide and be limited in narrower bandwidth, therefore improve the availability of frequency spectrum and transmission rate of system, reduce system
The bit error rate.
Fig. 5 is refer to, specifically, overlapped time division multiplexing modulating device 101 can be realized by following hardware cell.
Overlapped time division multiplexing modulating device 101 includes digital waveform generator 401, shift register 402, modulator
403rd, multiplier 404 and adder 405.
First cophase wave of initial envelope waveform is formed by digital waveform generator 401 in a digital manner first
Shape, the initial envelope waveform is smoothed in time domain；Again by shift register 402 by digital waveform generator 401
The phase wiggles of the first initial envelope waveform for producing are shifted, to produce each moment sending signal
Skew envelope waveform；Then, the digital signal sequences of input are converted into sign symbol sequence by modulator 403,
Multiplier 404 is then by the skew envelope of each moment sending signal after the sign symbol sequence after conversion and skew
Waveform is multiplied, to obtain the modulation envelope waveform at each moment；It is last by adder 405 by each moment
Modulation envelope waveform is overlapped in time domain, to obtain carrying the multiple modulation envelope waveform of output signal sequence,
Form 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.Its
The docking collection of letters number of middle synchronizer 501 forms a symbol time synchronization in receiver；Then channel estimator 502
Channel parameter is estimated；Digital processor 503 is digitized place to the reception signal of each frame in
Reason, so that forming suitable sequence detecting apparatus carries out the digital signal sequences of Sequence Detection reception.
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 that analytic unit memory 601, comparator 602 and multiple surviving paths are deposited
Reservoir 603 and Euclidean distance memory 604 or weighted euclidean distance memory (not shown).In detection
During, the complex convolution encoding model that analytic unit memory 601 makes overlapped time division multiplexing system is passed
Shape figure, and whole states of overlapped time division multiplexing system are listed, and store；And comparator 602 is according to analysis
Trellis structure in cell memory 601, searches out and receives data signal minimum Eustachian distance or weighting minimum
The path of Euclidean distance；And surviving path memory 603 and Euclidean distance memory 604 or weighted Euclidean away from
Then be respectively used to store from memory the surviving path and Euclidean distance or weighted Euclidean of the output of comparator 602 away from
From.Wherein, surviving path memory 603 and Euclidean distance memory 604 or weighted euclidean distance memory
Need respectively to prepare one for each stable state.The length of surviving path memory 603 can be preferably 4K~
5K.Euclidean distance memory 604 or weighted euclidean distance memory are preferably only storage relative distance.
In the present embodiment, initial envelope waveform is Berman (Bohman) envelope waveform or its differentiation window function
Envelope waveform.
Then with initial envelope waveform as Berman, (Bohman) envelope waveform is done furtherly to the application below
It is bright.Wherein, overlapping multiplexing number of times K=3, incoming symbol length N=8, incoming symbol xi={+1+1-1-1-1
+ 1-1+1 } as a example by illustrate that the signal of OvTDM sends and receives process.Wherein, incoming symbol length refers to
Send the length of a frame signal.
Fig. 5 is refer to, signal generation process includes below step：
(1) Berman (Bohman) 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, its time domain waveform and the frequency-domain waveform such as institute of accompanying drawing 8
Show.As can be seen from Figure 8, Berman (Bohman) window is the frequency domain band by 0 point in time domain waveform
Nearly 60dB is decayed to outward.
Specifically, for Berman (Bohman) window function (symmetric function), it can be represented by formula below：
ω (x)=(1- | x |) cos (π | x |)+(1/ π) sin (π | x |)
Wherein, -1≤x≤1.It should be noted that the function variable in x only representation formulas in above-mentioned formula.
(2) Berman (Bohman) envelope waveform h (t) designed by (1) is pressed into predetermined shifting in time domain
Bit interval is shifted, wherein, shift intervals are time interval △ T (△ T=L/K=21).After displacement,
Formed each moment sending signal skew envelope waveform h (t-i* △ T) (due to N=8, thus i be integer and
Value be 0~7), the skew envelope waveform figure of each moment sending signal is as shown in Figure 9 after displacement.
(3) digital signal sequences of input are converted into sign symbol sequence.
Specifically, in the digital signal sequences that will can be input into 0,1 is converted to ± A, A values are non-zero
Meaning number, to obtain sign symbol sequence.For example, take A for 1 when, will be input into { 0,1 } bit sequence pass through
BPSK modulation conversions are 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 }) and (2)
The skew envelope waveform h (t-i* △ T) of each moment sending signal of generation is multiplied, and obtains the modulation at each moment
Envelope waveform xih(t-i*△T)；Waveform after formation is as shown in Figure 10, wherein three different dotted lines represent phase
Three oscillograms after multiplying.
(5) the modulation envelope waveform x at each moment for being formed (4)iH (t-i* △ T) is carried out in time domain
Superposition, to obtain carrying the multiple modulation envelope waveform of output signal sequence, that is, the signal for sending.Transmission signal
Oscillogram is as shown in the solid line waveform in Figure 10.
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 modulation envelope ripple is made
The operation values of shape are+A, when modulation envelope waveform is multiplied by minus symbol with the moment envelope waveform to be obtained, order
The operation values of the modulation envelope waveform are-A.For each shift intervals, the tune in the shift intervals will be located at
The operation values superposition of envelope waveform processed, draws the output signal of the shift intervals, so as to form output signal sequence
Row.
Therefore, in the present embodiment, when A values are 1, the output symbol (output signal sequence) after superposition is
For：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,
A symbol x to be sent is represented per a lineiObtained after being multiplied with the envelope waveform h (t-i* △ T) at corresponding moment
Signal waveform x to be sentih(t-i*△T)。a0~ak-1Expression is carried out to each window function waveform (envelope waveform)
The coefficient value for being segmented the every part for obtaining K times, the specially coefficient on range value.
During due to the digital signal sequences of input being converted into sign symbol sequence, the data signal sequence that will be input into
0,1 is converted to ± A in row, and A values are non-zero Arbitrary Digit, to obtain sign symbol sequence.For example, A takes
Be worth for 1 when, will be input into { 0,1 } bit sequence by BPSK modulation conversions into {+1, -1 } symbol sebolic addressing,
To obtain sign symbol sequence.So being the symbol additive process principle schematic of K roads waveform shown in Figure 12.
In Figure 12 additive processes, the number of the 1st row left side 3 represents the 1st incoming symbol+1, the 2nd 3, the row left side
Number represents the 2nd incoming symbol+1, and the number of the 3rd row left side 3 represents the 3rd incoming symbol -1st, the 1st row
Middle 3 numbers represent that 3 numbers represent the 5th incoming symbol -1st in the middle of the 4th incoming symbol -1st, the 2nd row,
3 numbers represent the 6th incoming symbol+1 in the middle of 3rd row, and 3 numbers of the 1st row the right represent the 7th input
Symbol -1,3 numbers of the 2nd row the right represent the 8th incoming symbol+1.Therefore, after three 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 according to shown in Figure 11 and Figure 12
Mode is overlapped, to obtain output symbol.
Due to Berman (Bohman) envelope waveform time domain by 0 (0.0028, close to 0) starting, with flat
Waveform after sliding waveform, therefore superposition is smoother, and frequency domain bandwidth is narrower so that the waveform frequency spectrum after superposition
Efficiency is higher, and the transimission power needed for sending signal is relatively low.
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, that is, is pressed
Row decoding is entered to the waveform after cutting according to certain decoding algorithm.
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 figure of Fig. 7 Input output Relationships
8 node state transfer relationship figures, 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 after the 3rd
Figure reforms into repetition, because the branch that every node from labeled as a gives off has same output,
The conclusion is equally applicable to node b, c, d.They nothing more than being several possibility as shown in figure 14, from
It can be seen that (through input+1) node a and (through input -1) node b can only be transferred to from node a in Figure 14, together
When b can only arrive (input+1) c and (input -1) d, c and can only arrive (input+1) a and (being input into -1) b, d can only arrive (defeated
Enter+1) c and (input -1) d.The reason for producing this phenomenon is very simple, because only that adjacent K is (specific to this example
It is that 3) individual symbol can just be formed and interfered.So when K data are input to channel, for coming earliest
1 data has moved out a shift unit of rightmost.Therefore the output of channel is except depending on current moment
The input of data, further depends on the input of preceding K-1 data.
Such as blackening shown in thick line in Figure 13, first due to s (t) accords with for node state transfer in present case
Number be+1, so node transfer path is：+1->a->a->b->d->d->c->b->C, according to this turn
The symbol sebolic addressing that shifting relation can obtain input is {+1+1-1-1-1+1-1+1 }.
In the present embodiment, because Berman (Bohman) envelope waveform is smoother in time domain, and side lobe attenuation
Comparatively fast, therefore required transimission power is relatively low, precision is higher when being cut to waveform, the symbol for receiving
The sequence degree of accuracy 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
During envelope waveform, then the oscillogram after each signal generated according to above-mentioned signal generation process and superposition is such as
Shown in Figure 16, wherein three different dotted lines represent three oscillograms, solid line represents the oscillogram after superposition.
As can be seen from Figure 16, square wave in time domain by 1, and broader bandwidth, on frequency domain
Side lobe attenuation is slow, therefore waveform after time domain superposition is unsmooth, and frequency domain bandwidth is wider, useful signal and nothing
Effect signal is difficult to differentiate between so that transimission power required during sending and receiving signal increases, and receives letter
The accuracy rate of waveform cutting and coding/decoding capability reduction during number.In systems in practice transmission rate it is identical and
In the case of spectrum efficiency identical, required transimission power and the bit error rate are all very high during using square wave.
But Berman (Bohman) window used in the present embodiment time domain starting point by 0, secondary lobe declines
Subtract very fast, the waveform after Signal averaging is smoothed, and frequency domain bandwidth is narrower, improves the accurate of waveform cutting process
The error correcting capability of rate and encoding-decoding process, reduces the transimission power of signal so that in the timing of spectrum efficiency one,
Transmission rate higher can be just reached using relatively low transimission power.
In addition, in other embodiments, initial envelope waveform is also an option that various with Berman (Bohman)
The envelope waveform of the function that window function is developed, including the company of Berman (Bohman) pulse-shaping multiplies, each rank is led
The envelope waveform of the functions such as number, all-order derivative sum, these envelope waveforms are same flat with waveform in time domain
The characteristics of sliding, therefore using can be reached after these envelope waveforms and use Berman (Bohman) Envelop waves
The close effect of shape.
The present invention provide overlapped time division multiplexing modulator approach, apparatus and system due to initial envelope waveform when
Smoothed in domain so that the waveform after superposition is smoothed, so that the transimission power of system linearly slowly increases,
Connect and improve the availability of frequency spectrum and transmission rate.The overlapped time division multiplexing modulator approach, apparatus and system can be with
It is applied to mobile communication, satellite communication, microwave horizon communication, scatter communication, atmosphere optic communication, infrared
In the wireless communication systems such as communication, underwater sound communication, Large Copacity was both can apply to and had been wirelessly transferred, it is also possible to should
For 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 in above-mentioned implementation method
To instruct related hardware to complete by program, the program can be stored in a computer-readable recording medium,
Storage medium can 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, not
It is used to limit the present invention.For those skilled in the art, according to thought of the invention,
Some simple deductions, deformation can also be made or replaced.
Claims (11)
1. a kind of overlapped time division multiplexing modulator approach, it is characterised in that including：
Generate the smooth initial envelope waveform of waveform in time domain, initial envelope waveform be Berman 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；
By the sign symbol sequence after conversion with skew after each moment sending signal skew envelope waveform phase
Multiply, to obtain the modulation envelope waveform at each moment；
The modulation envelope waveform at each moment is overlapped in time domain, to obtain carrying output signal sequence
Multiple modulation envelope waveform.
2. the method for claim 1, it is characterised in that the shift intervals are time interval △
T, time interval △ T is：
△ 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. the method described in claim 2, it is characterised in that time interval △ T are not less than systematic sampling
The inverse of rate.
4. the method for claim 1, it is characterised in that the digital signal sequences conversion that will be input into
It is specially into sign symbol sequence：In the digital signal sequences of input 0 is converted into+A, 1 is converted to-A,
To obtain sign symbol sequence, the wherein value of A is non-zero Arbitrary Digit.
5. the method for claim 1, it is characterised in that the output signal sequence is by following
Mode determines：
When modulation envelope waveform is multiplied by plus sign with the skew envelope waveform at the moment to be obtained, the modulation is made
The operation values of envelope waveform are+A, when modulation envelope waveform is mutually multiplied with the envelope waveform at the moment by minus symbol
Then, the operation values for making the modulation envelope waveform are-A；Wherein the value of A is non-zero Arbitrary Digit；
For each shift intervals, the operation values of the modulation envelope waveform that will be located in the shift intervals are superimposed,
The output signal of the shift intervals is drawn, 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, initial Envelop waves in time domain
Shape is Berman envelope waveform or its envelope waveform for developing window function；
Shift module, for initial envelope waveform to be pressed into predetermined displacement in time domain according to overlapping multiplexing number of times
Interval is shifted, 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 it is inclined
Move envelope waveform to be 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 be taken
Multiple modulation envelope waveform with output signal sequence.
7. the device described in claim 6, it is characterised in that the shift intervals are time interval △ T,
Time interval △ T are：
△ 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 time interval △ T are not less than systematic sampling
The inverse of rate.
9. the device described in claim 6, it is characterised in that modulation module is used for the numeral letter that will be input into
When number sequence is converted into sign symbol sequence：Modulation module is used for 0,1 in the digital signal sequences that will be input into
± A is converted to, A values are non-zero Arbitrary Digit, to obtain sign symbol sequence.
10. the device described in claim 6, it is characterised in that the output letter that multiple modulation envelope waveform is carried
Number sequence is made up of the output signal of each shift intervals, and the output signal of each shift intervals is in each shift intervals
Modulation envelope waveform operation values superposition after result, when modulation envelope waveform is by plus sign and the moment
Envelope waveform is multiplied when obtaining, and its operation values is+A, is multiplied with the envelope waveform at the moment by minus symbol and obtained
When, its operation values is-A, and 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 is carried for generating
The multiple modulation envelope waveform of signal sequence；
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 make decisions output.
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| CN201510981430.0A CN106911459A (en) | 2015-12-23 | 2015-12-23 | A kind of overlapped time division multiplexing modulator approach, apparatus and system |
| KR1020187019865A KR102277047B1 (en) | 2015-12-23 | 2016-12-22 | A kind of superposition multiplexing modulation method, 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 |
| US16/017,012 US10630408B2 (en) | 2015-12-23 | 2018-06-25 | Overlapped multiplexing modulation method, apparatus and system |
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| WO2008006246A1 (en) * | 2006-07-06 | 2008-01-17 | Daoben Li | A time division multiplexing method and system |
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