CN108270713A - It is a kind of to use scene signals multiple access method and system more - Google Patents
It is a kind of to use scene signals multiple access method and system more Download PDFInfo
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- CN108270713A CN108270713A CN201810048981.5A CN201810048981A CN108270713A CN 108270713 A CN108270713 A CN 108270713A CN 201810048981 A CN201810048981 A CN 201810048981A CN 108270713 A CN108270713 A CN 108270713A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
Abstract
The present invention proposes a kind of multiple access method (F BFDM) and system of more application scenarios signals suitable for wireless communication, in transmitting terminal, FFT variations are first carried out per road signal to be configured in the frequency range of distribution signal, then pre-filtering is carried out to reduce the power closed of modulated signal (PAPR), filtered signal is modulated to by cycle Fourier anti-change (CCIDFT) on subcarrier, and channel is sent to plus cyclic prefix (CP) after each road modulated signal combination.The present invention corresponds to an application scenarios per road signal, and complete rebuild of system is completed by the CCDFT of receiving terminal, and CCDFT is realized by bi-orthogonal filter group.Interference when different application scene signals carry out multiple access access can be reduced by free prototype wave filter to greatest extent so that glitch-free can also be accessed in the case of no isolation strip per between the signal of road, improve the availability of frequency spectrum to greatest extent.
Description
Technical field
The present invention relates to multiple access technique, more particularly to a kind of filtering biorthogonal frequency division multiple access method (F-BFDMA).
Background technology
Multi-user's (multiple access) access is indispensable component part in wireless communication system, using LTE standard as representative
In forth generation mobile radio communication, uplink uses single carrier frequency division multiple access technology (SC-FDMA), and downlink uses orthogonal frequency
Multiplexing multiple-user access technology (OFDMA).But both multiple access techniques are all only adapted to more in single application scene
User accesses, such as traditional voice data communication.The major impetus of future mobile communications development is Internet of Things (IoT) and machine
Communication (M2M) to machine, such as vehicle-carrying communication.The characteristics of next generation wireless communication net is that plurality of application scenes is (more in other words
Kind service) access same network jointly, these application scenarios may be high-speed data communication (high-speed communication of Gbps magnitudes),
Traditional voice communication, IoT communications and vehicle-carrying communication.Each communication is construed as a kind of application scenarios, different application
The signal of scene has very big difference.
The high-speed communication requirement system of Gbps magnitudes has the ability of high-speed transfer, very high to the synchronous requirement of system, but
Insensitive to being delayed, in order to meet high-speed transfer, this kind of application usually has long signal frame and high sub-carrier number, the biography of occupancy
Defeated frequency band is also wider.The characteristics of IoT communicates is randomness, asynchronous, short data, low delay and low-power consumption and low cost, this
The signal frame of class communication is short, and sub-carrier number is few, to carrier frequency drift sensitivity.Vehicle-carrying communication requirement delay is short, and communication reliability is high, this
The signal frame of class communication is short, and system rejection to disturbance is strong.Therefore, the modulated signal of different application scene has different signal frame lengths,
Width between its subcarrier is also different, if all application scenarios all use multi-carrier modulation, then their IFFT
Length be also different.How these are connect with the modulated signal of different sub-carrier width and length independence, interference-free
Enter into system, be to have a problem to be solved in current 5th generation (5G) wireless communication.Existing OFDMA and SC-FDMA
It can not use, because both methods requires that the sub-carrier number of different user is equally distributed, there is identical son
Carrier widths.
Academic and industrial quarters has the various key technologies of 5G extensive research at present, but services letter to more scenes more
Number noiseless access be still a blank, Chinese Huawei Company proposes a kind of filtering OFDM (f-OFDM) scheme, principle
Then pair it is that general OFDM modulation and prefixing (CP) are first carried out to every road signal, plus the ofdm modulation signal after CP is into line
Property filtering, filtered ofdm modulation signal is directly accessed to the system.The characteristics of f-OFDM is to meet progress to entire OFDM modulation
Filtering significantly reduces the band outward leakage (OOBE) during the access of every road ofdm modulation signal, reduce every road modulated signal it
Between interference, reduce the length of isolation strip between every road, improve the availability of frequency spectrum of system.But f-OFDM is asked there are several
Topic, first, the modulation in f-OFDM Zhong Mei roads signal is continuing with OFDM modulation, since OFDM has PAPA high, to carrier frequency drift
(CFO) the shortcomings of attenuation of sensitive and out-of-band power spectrum density is slow, OFDM is unsatisfactory for requirements of the 5G to modulating system, because 5G is modulated
System requirements has low PAPR, low CFO susceptibilitys and the attenuation of high out-of-band power spectrum density；Second is that due to the needs of filtering, f-
OFDM Zhong Mei roads OFDM modulation symbols are continuing with plus CP, the holding of CP greatly reduce the availability of frequency spectrum of whole system,
The two shortcomings cause f-OFDM not to be suitable for more scene signals access of 5G.It is therefore desirable to study a kind of new more scenes
Signal access technology come meet future wireless system development the needs of, the present invention precisely in order to meet it is this requirement and propose.
Invention content
The present invention in view of the above-mentioned problems existing in the prior art, proposes a kind of multiple access method of more application scenarios signals
That is system.
The present invention solve above-mentioned technical problem technical solution be:
It is a kind of to use scene signals multiple access method more, in transmitting terminal, L is carried out to every road incoming symboli(Li=NiMi)
Point quick Fourier converts (FFT) and pre-filtering pretreatment (i the i-th road signals of expression, MiRepresent the sub-carrier number on the i-th tunnel, Ni
Represent filter factor overlap factor), time-domain symbol is transformed to frequency domain symbol signal and is carried out at cyclic convolution IDFT (CCIDFT)
Reason, per the sub-carrier number M of road input signaliIt can be different.By CCIDF, treated after each road modulation symbol directly synthesizes
Prefixing is sent to transmitting terminal.
In receiving terminal, prefix is gone in the docking collection of letters number, and equalised device removes the signal after prefix, carries out cyclic convolution DFT
(CCDFT) every road signal is demodulated, when the signal progress post-filtering and fast reverse Fourier IFFT after demodulation convert to obtain
Domain signal, then symbol reflection is carried out to time-domain signal and is penetrated, it penetrates the transmitting terminal incoming symbol for handling and obtaining and rebuilding through symbol reflection and believes
Number.
One of embodiment of the present invention includes：The pre-filtering is a Subband Analysis Filter group, and subband divides
Analyse N of the wave filter group for i roads over the groundiMiPoint frequency domain symbol signal carries out pre-filtering (for the convenience of description, following description
In we replace N with NMiMi), pre-filtering part is according to ptototype filter construction of function coefficient matrix H1, with coefficient matrix H1
Being handled NM point frequency domain symbol signals (such as right side multiplies processing) obtains NM point frequency domain symbol signals.
The CCIDFT processing further comprises reverse Fourier transformation processing and the processing of sub-band synthesis filter group, inversely
Fourier transformation IFFT Department point carries out NM point frequency domain symbols signal n times M-point IFFT transformation, obtains NM point output symbol signals；
Sub-band synthesis filter group coefficient matrix G2NM point symbol signals are handled to obtain NM point modulation symbol signals.Form system
Matrix number H1And G2Prototype function can be different because the purposes of the two coefficient matrixes is different, H1Purpose be reduce
PAPR, and G2Purpose be that modulation is met to carry out limit band and shaping filter.Coefficient matrix G2By CCIDFT synthesis filter groups
Coefficient shifts to obtain by M dot cycles, and CCIDFT synthesis filter systems number freely can design and select not rebuild completely
Condition limits.
One of embodiment of the present invention includes：Fast Fourier Transform (FFT) is further a NM- point quick Fourier
Transformation, wherein, M is the sub-carrier number that each user assigns to, and N is the overlapping shadow of wave filter group, and N, M are more than or equal to 1
Positive integer.
One of embodiment of the present invention includes：Coefficient matrix H1The square for having N × N number of matrix element block by one respectively
Battle array ring shift right M points obtain, coefficient matrix G2The matrix circular for having N × N number of matrix element block by one respectively moves to right M points, so
Transposition obtains afterwards；Coefficient matrix H1And G2Including a series of submatrix hiAnd gi, by prototype function coefficient h (n) and g (n) (0
≤ n≤NM-1) it is divided into N number of sub-block, M points are included per sub-block.
Specifically, G2The dimension of matrix is NM × NM, the matrix-block ring shift right M for having M × NM matrix element by one
Obtain the matrix G that size is NM × NM2, the right remove M points shift-in the left side M points, shift and opened from first M × NM matrix-block
Begin until n-th matrix block end.
The present invention also proposes one kind mostly with scene signals multiple access system, which includes：Transmitting terminal and receiving terminal,
Transmitting terminal includes：It maps to obtain the symbol map unit of complex symbol signal for carrying out symbol to binary bit sequence, use
In the Fast Fourier Transform FFT unit for time-domain symbol signal being transformed to frequency domain symbol signal, pre-filter, to frequency domain
Mark signal carries out the CCIDFT processing units that multi-carrier modulation is changed, and CCIDFT units use synthesis filter group structure.It receives
End includes：Docking collect mail prefix, equilibrium treatment number is gone to obtain mark signal remove prefix unit, balanced device, after equilibrium treatment
Signal the CCDFT processing units, the post-filtering that are converted, for offsetting the effect of transmitting terminal pre-filtering, IFFT units,
Transmitting terminal reconstruction signal is obtained for the mark signal obtained to be carried out inverse fast fourier transform.
One of embodiment of the present invention includes：CCIDFT processing units further comprise reverse Fourier transformation processing
Unit, subband integrated filter processing unit, reverse Fourier transformation processing unit IFFT carry out n times M-point IFFT to mark signal
Transformation, input is met in signal modulation to subcarrier, and subband integrated filter processing unit carries out NM point modulation symbols signal
Further filtering, to improve the power spectral density of modulated signal, according to ptototype filter construction of function filter bank coefficients matrix
G2, with coefficient matrix G2NM point frequency domain symbol signals are handled, the filtered mark signal of NM points is obtained (as the right side multiplies).
One of embodiment of the present invention includes：Pre-filtering part is according to ptototype filter construction of function coefficient matrix
H1, with coefficient matrix H1NM point frequency domain symbols signal is carried out right multiplied to the filtered frequency domain symbol signal of NM points.
One of embodiment of the present invention includes：According to ptototype filter construction of function coefficient matrix H1Including：Such as original
Mode filter is square root raised cosine RRC functions, and ptototype filter function coefficients h (n) is：
Coefficient matrix H1There is N × N number of matrix element block h by oneiThe matrix circular of (0≤i≤N-1) moves to right M points and obtains,
Coefficient matrix H1Including a series of submatrix hi, by the way that prototype function coefficient h (n) (0≤n≤NM-1) is divided into N number of sub-block, often
Sub-block includes M points, matrix element block hiIt is diagonal matrix, hiIt is made of the M points of the i-th sub-block, wherein, each users of M assign to
Sub-carrier number, N represent the access customer number of different application scene, and r represents the roll-off factor of RRC functions, RRC function variables n's
Range is determined by the length NM of prefilter.Ptototype filter coefficient matrix H1Size for NM × NM, in cyclic shift
In the process, the M points on the M points shift-in left side that the right removes, shift from first M × NM matrixes BOB(beginning of block) to the N-1 matrix-block
Terminate,
Wherein, h (iM) represents i-th M coefficient.
The present invention further comprises：CCIDFT processing units further comprise reverse Fourier transformation processing unit, subband
Integrated filter processing unit, subband integrated filter processing unit carry out postposition shaping filter to NM point frequency domain symbols signal, specifically
For synthesis filter coefficients matrix G2Multiply processing to the NM point frequency domain symbol signals right side and obtain post-filtering treated NM point frequency domains
Mark signal, wherein, synthesis filter coefficients matrix G2Equal to coefficient matrix H2Inverse matrix, i.e.,Matrix G2And H2
Form biorthogonal matrix, i.e. G2H2=I (I is unit matrix).Coefficient matrix H2Structure and H1It is identical, but H2And H1Can have not
Same prototype function.
Further, the processing procedure of balanced device removal channel disturbance of the present invention includes, and the signal that receiving terminal receives is gone
The system letter that FFT transform (Fast Fourier Transform) obtains frequency-region signal, frequency-region signal divided by channel to frequency domain is carried out after prefix
Number H (k) (Fourier transformation of channel impulse response h (n)) converts to obtain the signal of removal channel disturbance through IFFT.
Further, receiving terminal balanced device carries out FFT transform acquisition frequency-region signal after prefix is gone to mark signal, by frequency domain
The system function of signal divided by channel converts to obtain the signal of removal channel disturbance through IFFT.Receiving terminal CCDFT units：For
The mark signal of NM points removal channel disturbance is reduced to NM point time-domain symbol signals, n times are carried out to NM point time-domain symbols signal
M-point FFT transform obtains NM point frequency-region signals, then the right multiplying factor matrix G of NM point frequency-region signals1Obtain NM point signals
G1It is transmitting terminal prefilter H1Inverse matrix,
Since every road signal will be first modulated before access, the selection of modulator has key to multiple access access
It influences.We modulate the signal on every road using biorthogonal frequency division multiplexing (BFDM) in the present invention, and BFDM is based on wave filter
The multi-carrier modulation of group, maintains the ability of the anti-radio channel multi-path attenuation of multicarrier modulation system, while has low-down
PAPR values, insensitive to CFO and very high out-of-band power spectrum density attenuation.That is BFDM had both maintained the excellent of OFDM
Point, while the shortcomings that overcome OFDM again, fully meet requirement of the next generation wireless communication to modulator.And BFDM is used
Filter bank structure, is that each subband is filtered, and can not only reduce the interference between modulation symbol, while can also reduce son
The interference of interband.Different with traditional filter bankmodulation device (FBMC), BFDM can allow transmission using quadrature architecture
The free prototype wave filter in end, therefore can so that band outward leakage (OOBE) is very small, it in this way can be direct per road signal
Without any isolation strip, this has been considerably improved the availability of frequency spectrum for access.
More scene signals cut-in methods proposed by the present invention are also not required to cyclic prefix and show without isolation strip, often road signal
Some methods are compared, and substantially increase the availability of frequency spectrum.Further it is proposed that use scene signals multiple access system
It solves the disadvantage that in traditional FBMC modulation techniques complete reconstruction cannot be reached, relieves reconstruction condition polyarch function completely and set
The constraint of meter makes the design of prototype function and selection obtain sufficient degree of freedom.It is proposed by the present invention to use scene signals more
Multiple access system has better performance than traditional FBMC modulation techniques, and PAPR and single-carrier modulated SC-FDMA are approached.
BFDMA multicarrier modulation systems can be not only used for high-speed communication and can be used for IoT and M2M communication.
Description of the drawings
Figure 1B FDMA multicarrier modulation system theory structure block diagrams；
The example of Fig. 2 prototype function h (n) and g (n)；
The power spectral density (PSD) of Fig. 3 prototype function h (n) compares；
The zero setting balanced device schematic diagram that Fig. 4 receiving terminals use.
Specific embodiment
Illustrate the multiple access technique of more application scenarios signals of the present invention with a specific embodiment below.It should be noted that
, the main process for describing an only specific embodiment herein is not considered as unique embodiment, therein
Each step it is not necessary to, whole flow process and its specific steps are also not limited in figure and the description of context.For example,
Depending on wireless channel communication quality quality, wherein some units it is not necessary to, for one of skill in the art come
Say, after the content of present invention and principle is understood all may in the case of without departing substantially from the principle of the invention, structure, to this system into
The various modifications and variations of row in form and details, but these modifications and variations are still in the claims of the present invention
Within.It should be evident that for those of ordinary skill in the art, without creative efforts, may be used also
To apply the present invention to other similar scenes according to these attached drawings.
BFDM multicarrier modulation systems as shown in Figure 1 to be used in filtering biorthogonal fdma system (F-BFDM) are former
Structure diagram is managed, BFDM multicarrier modulation systems include：Transmitting terminal and receiving terminal, transmitting terminal include：It is symbol map unit, preposition
Filtering, NM- point FFT transform unit, CCIDFT units, wherein, CCIDFT units include:Subband integrated filter part, n times M-point
IFFT conversion sections.Receiving terminal includes：CCDFT units, NM- point IFFT converter units, post-filtering, the anti-map unit of symbol.
Binary bit sequence s (n) carries out symbol mapping through symbol map unit, and symbol mapping can use QPSK or QAM methods, pass through
The complex symbol signal for needing to be modulated is obtained after symbol mapping.Sub-band analysis filtration unit carries out pre-filtering to signal
Afterwards, CCIDFT converter units are sent into be converted, obtain modulated signal, being sent into channel after prefixing is sent to receiving terminal.
Prefix and equilibrium treatment are gone in the receiving terminal docking collection of letters number, after sub-band analysis filtration is handled, are re-fed into M-point FFT changes
It changes unit and n times M-point FFT transform acquisition frequency domain sub-band signal is carried out to it, subband signal carries out post-filtering processing, then send
Enter NM- point IFFT converter units and obtain time-domain signal, most penetrating cell processing through symbol reflection afterwards obtains the transmitting terminal rebuild input
Mark signal.
Specifically, to every road application scenarios signal, it is assumed that number of users N, total sub-carrier number are L=NM, Mei Geyong
The sub-carrier number that family is assigned to is M, and sub-carrier signal obtains M mark signal after the mapping of symbol map unit.Plural number is accorded with
Number signal carries out L point FFT transform, and time-domain symbol signal is transformed to frequency domain and obtains frequency-region signal.
The position of transmitting terminal prefilter serves a dual purpose between NM points FFT and CCIFT in F-BFDM, and one
It is the PAPR values that system is reduced using the symmetry of filter coefficient, second is that it is more that frequency domain symbol signal is assigned to different sub-band progress
Carrier modulation.The filter coefficient has symmetry, and frequency domain symbol signal is assigned to different sub-band and carries out multi-carrier modulation.It is preposition
Wave filter is by analysis filter device coefficient matrix H1It forms, with coefficient matrix H1NM points FFT output frequency domain symbol signals are carried out right
It is multiplied into pre-filtering.Symbol map unit carries out symbol mapping, obtains M time domain incoming symbol signal, FFT transform unit pair
NM point time-domain symbols signal carries out FFT operations and obtains NM point frequency domain symbol signals.
CCIDFT variations include dividing IFFT transformation and filtering part part, optimal that following manner, IFFT conversion sections can be used
N times M-point IFFT transformation is carried out to NM point frequency domain symbols signal, obtains NM point time domain complex symbol signals.Filtering part is according to original
Mode filter construction of function coefficient matrix G2, with coefficient matrix G2NM point frequency domain symbols signal is carried out right multiplied to the filtering of NM points
Frequency domain symbol signal afterwards, according to ptototype filter construction of function coefficient matrix G2It can be used following method, prototype function can be with
It is arbitrary to choose, such as the prototype function that this fields such as square root raised cosine function, the prototype function of optimization design use.
Below with example explanation, such as ptototype filter is RRC functions (square root raised cosine function), then ptototype filter
Function coefficients g (n) can be expressed as：
Wherein, M is equal to sub-carrier number, and r represents the roll-off factor of RRC functions, determines the stopband attenuation of RRC function filters
The factor, the range of RRC function variables n are determined by the length NM of prefilter.
Construct coefficient matrix G2, it is assumed that access customer number N, the sub-carrier number that each user assigns to are M, G2Matrix be by
One matrix circular for having N × N number of matrix element block moves to right M and obtains, wherein, matrix element block gi(0≤i≤N-1) is a right
Angle battle array, if RRC prototype function coefficient g (n) (0≤n≤NM-1) are divided into N number of sub-block (M points are included per sub-block), giRespectively by
The M points prototype function composition of i-th sub-block.G2Size be NM × NM.During cyclic shift, the M points that the right removes move
Into the M points on the left side.Displacement is from first M × NM matrixes BOB(beginning of block) to the N-1 matrix block end.That is,
With coefficient matrix G2It is multiplied to NM point symbol signals that the right side is carried out to NM point frequency domain signal Xs (k), then, to NM glyphs
Number signal carries out n times M-point IFFT (inverse fast fourier transform) operation, obtains NM point time-domain signals.
Receiving terminal carries out the operation opposite with transmitting terminal.Receiving terminal carries out prefix process first to the signal received,
Then equalised device carries out balancing operational removal channel disturbance, is closed through sub-band analysis filtration and signal is assigned to different sub-band, M-point
FFT transform unit obtains frequency domain sub-band signal to it into n times M-point FFT transform, and then by post-filtering, filtering output is sent into
NM- point IFFT converter units obtain time-domain signal, and penetrating cell processing through symbol reflection obtains transmitting terminal reconstruction mark signal.
Wherein, frequency domain zero setting balanced device, which may be used, in balanced device can also use non-zero setting type balanced device, may be used blind
Balanced device can also use non-blind equalizer, and self-adaptation type balanced device, which may be used, can also use non-adaptive type balanced device.
One embodiment of the present of invention is using frequency domain zero setting balanced device, and frequency domain zero setting balanced device is by the signal after going prefix
FFT transform is carried out to frequency domain, then divided by the Fourier transformation of the system function H (k) of channel (channel impulse response h (n))),
It finally carries out IFFT (inverse fast fourier transform) transformation and obtains the signal of removal channel disturbance.Fig. 4 is putting for receiving terminal use
Time-domain symbol signal is transformed to frequency domain symbol signal and carries out DFT filter process by zero balanced device schematic diagram, receiving terminal.Receive letter
Number by DFT, zero setting equalizer processes, convert to obtain the signal y (n) of transmitting terminal using IDFT.
Fig. 2, Fig. 3 give a specific example of prototype function h (n) and g (n).Modulated terminal prototype function h in Fig. 3
(n) it is obtained using window function design method, g (n) is that the design method provided using the present invention is obtained.H (n) and g (n)
With biorthogonal characteristic.
Fig. 4 gives power spectral density (PSD) comparison curves of three kinds of prototype functions, rectangular window function, RRC functions and excellent
Change the prototype function of design.Fig. 4 shows that the prototype function of optimization design has PSD characteristics more better than RRC, can better meet
System performance requirements.
To sum up, this system in transmitting terminal, FFT variations is first carried out per road signal, signal is configured in the frequency range of distribution, so
Pre-filtering is carried out afterwards to reduce the power closed of modulated signal (PAPR), and filtered signal is by cycle Fourier
Anti-change (CCIDFT) is modulated on subcarrier, and channel is sent to plus cyclic prefix (CP) after each road modulated signal combination.Often
Road signal corresponds to an application scenarios.Can there are different sub-carrier numbers and signal frame length, different when frequency divisions per road signal
Resolution.Transmitting terminal uses CCIDFT, and transmitting terminal is not constrained by complete condition of rebuilding, and permission freely designs wave filter group prototype letter
Number, meets system performance requirements to greatest extent.Complete rebuild of system is completed by the CCDFT of receiving terminal, and CCDFT is filtered by biorthogonal
Wave device group is realized.Different application scene signals can be reduced by free prototype wave filter to greatest extent and carry out multiple access
Interference during access so that glitch-free can also be accessed in the case of no isolation strip per between the signal of road, to greatest extent
Improve the availability of frequency spectrum.
Illustrative embodiments listed by the present invention are as described above, but the only to facilitate case for understanding the present invention and using
Example, is not limited to the present invention.In the case of without departing substantially from inventive concept and essence, those skilled in the art
Various corresponding modifications and variations, patent protection model of the invention can be made in the formal or details of implementation according to the present invention
It encloses, the range that claims of being still subject to are defined.
As shown in the specification and claims, unless context clearly prompts exceptional situation, " one ", "one",
The words such as " one kind " and/or "the" not refer in particular to odd number, may also comprise plural number.It is, in general, that term " comprising " is only carried with "comprising"
Show including clearly identify the step of and element, and these steps and element do not form one it is exclusive enumerate, method or
Equipment may also include other step or element.
Claims (10)
1. a kind of use scene signals multiple access method more, it is characterised in that：Starting to hold, binary bit sequence is being carried out
Symbol maps to obtain complex symbol signal, and using fast Fourier FFT transform, time-domain symbol signal is transformed to frequency domain symbol letter
Number, to carrying out the discrete reverse Fourier transform CCIDFT processing of cyclic convolution after frequency domain symbol signal pre-filtering, it is sent to
Sending end；In receiving terminal, prefix is gone in the docking collection of letters number, and the signal after prefix is removed in balanced device equilibrium, is carried out CCDFT processing and is divided into subband
Frequency-region signal carries out post-filtering and fast reverse Fourier IFFT to subband frequency-region signal and converts to obtain time-domain signal, pair when
Domain signal carries out symbol reflection and penetrates the transmitting terminal incoming symbol signal that processing obtains reconstruction.
2. according to claim 1 use scene signals multiple access method more, it is characterised in that：The CCIDFT processing
Including the processing of reverse Fourier transformation and the processing of subband integrated filter, reverse Fourier transformation IFFT Department point is to NM point frequency domain symbols
Signal carries out n times M-point IFFT transformation, obtains NM point time domain complex symbol signals, and the processing of subband integrated filter accords with NM points frequency domain
Number signal carries out integrated filter synthesis full band signal, according to ptototype filter construction of function coefficient matrix G2, with coefficient matrix G2It is right
NM point frequency domain symbol signals are handled to obtain NM point frequency domain symbol signals；Wherein, the sub-carrier number that M is assigned to for each user, N
For access customer number.
3. according to claim 2 use scene signals multiple access method more, it is characterised in that：Coefficient matrix G2By one
A matrix circular for having N × N number of matrix element block moves to right M points and obtains, coefficient matrix G2Including a series of submatrix gi, pass through handle
Prototype function coefficient g (n) is divided into N number of sub-block, M points is included per sub-block, wherein 0≤n≤NM-1；Matrix element block giIt is a diagonal
Battle array, is made of the M points of the i-th sub-block.
4. use scene signals multiple access method according to Claims 2 or 3 more, it is characterised in that：As prototype filters
Device is square root raised cosine RRC functions, and ptototype filter function coefficients g (n) is：
Wherein, r represents the roll-off factor of RRC functions.
5. use scene signals multiple access method according to claim 1,2 or 3 more, it is characterised in that：CCDFT processing
Including sub-band analysis filtration processing unit carries out post-filtering to NM point frequency domain symbols signal, specifically, analysis filter coefficient
Matrix H2Multiply processing to the NM point frequency domain symbol signals right side and obtain post-filtering treated NM point frequency domain symbol signals, wherein, point
Analyse filter coefficient matrices H2Equal to coefficient matrix G2Inverse matrix, square G2And H2Form biorthogonal matrix.
6. a kind of use scene signals multiple access system more, which is characterized in that the system includes：Transmitting terminal and receiving terminal；
Transmitting terminal includes：Symbol map unit maps to obtain complex symbol signal for carrying out symbol to binary bit sequence；
Fast Fourier Transform FFT unit, for time-domain symbol signal to be transformed to frequency domain symbol signal, prefilter, using pair
Frequency domain symbol signal carries out pre-filtering；CCIDFT processing units, using synthesis filter group structure；
Receiving terminal includes：Prefix unit is removed, prefix is gone in the docking collection of letters number；Balanced device, equilibrium treatment obtain mark signal；CCDFT
Processing unit converts mark signal；Filter unit, for the mark signal obtained to be carried out post-filtering；Quick Fu
Vertical leaf inverse transformation IFFT units, for obtaining transmitting terminal reconstruction signal.
7. system according to claim 6, it is characterised in that：The CCIDFT processing units further comprise in reverse Fu
Leaf transformation processing unit and subband integrated filter processing unit, reverse Fourier transformation processing unit is to NM point frequency domain symbol signals
N times M-point IFFT transformation is carried out, obtains NM point time domain complex symbol signals；The processing of subband integrated filter is if only accord with NM points frequency domain
Number signal carries out integrated filter synthesis full band signal, according to ptototype filter construction of function coefficient matrix G2, with coefficient matrix G2It is right
NM point frequency domain symbol signals are handled to obtain NM point frequency domain symbol signals；Wherein, the sub-carrier number that M is assigned to for each user, N
For access customer number.
8. system according to claim 7, it is characterised in that：Coefficient matrix G2There is N × N number of matrix element block by one
Matrix circular moves to right M points and obtains, coefficient matrix G2Including a series of submatrix gi, it is N number of by the way that prototype function coefficient g (n) is divided into
Sub-block includes M points per sub-block, wherein 0≤n≤NM-1；Matrix element block giIt is a diagonal matrix, is made of the M points of the i-th sub-block.
9. system according to claim 6, which is characterized in that the CCDFT processing units further comprise that Fourier becomes
Change processing unit, sub-band analysis filtration processing unit；Sub-band analysis filtration processing unit is to NM point frequency domain symbol signals minute
Analysis filtering, according to ptototype filter construction of function ptototype filter coefficient matrix H2, with coefficient matrix H2NM points frequency domain symbol is believed
It number is handled, obtains NM point time domain complex symbol signals；Fourier transformation processing unit carries out n times M- to filtered output signals
Point FFT transform, wherein, M is the sub-carrier number that each user assigns to, and N is access customer number.
10. system according to claim 9, which is characterized in that analysis filter coefficient matrix H2NM points frequency domain symbol is believed
Number right side multiplies processing and obtains post-filtering treated NM point frequency domain symbol signals, wherein, synthesis filter coefficients matrix G2It is equal to
Analysis filter coefficient matrix H2Inverse matrix,Matrix G2And H2Form biorthogonal matrix.
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