CN105530217B - The signal of GFDM systems based on weighted score Fourier transformation emits and method of reseptance - Google Patents
The signal of GFDM systems based on weighted score Fourier transformation emits and method of reseptance Download PDFInfo
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- CN105530217B CN105530217B CN201610052207.2A CN201610052207A CN105530217B CN 105530217 B CN105530217 B CN 105530217B CN 201610052207 A CN201610052207 A CN 201610052207A CN 105530217 B CN105530217 B CN 105530217B
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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
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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
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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
Abstract
The signal of GFDM systems based on weighted score Fourier transformation emits and method of reseptance, and the present invention relates to the transmitting of the signal of the GFDM systems based on weighted score Fourier transformation and reception techniques.The present invention is to obtain more preferably bit error rate performance, and reduction peak-to-average power ratio.The present invention can flexibly adjust sub-carrier number and WFRFT exponent numbers in unit carrier block according to channel state information, user demand, and the exponent number in each subcarrier can keep difference to reach the demand of system performance.Suitable transformation exponent number is selected by WFRFT precodings and reasonably according to channel condition information, the system after coding can be made to obtain more preferably bit error rate performance, and possess lower peak-to-average power ratio.
Description
Technical field
The present invention relates to the transmitting of the signal of the GFDM systems based on weighted score Fourier transformation and reception techniques.
Background technology
GFDM carrier wave systems are a kind of a kind of new carrier wave systems for following 5G technologies, it is to be with OFDM technology
Base growth and come, by filtering multi-transceiver technology further develop from.In following 5G communication systems, increasingly focus on
The combination of more scenes, such as M2M and more crypto set complexity communication network and heterogeneous network, and need higher transmission rate,
The shorter response time, and more data are transmitted under limited frequency spectrum resource, this OFDM skill that 4G technologies are relied on
Art is a challenge.According to the scene demand of 5G, the main disadvantage of OFDM technology is exactly that larger out-of-band power radiates and lacks
The flexibility of waveform.Larger out-of-band power radiation can generate interference to the data on adjacent frequency band, and data can be made to generate mistake
Very, larger frequency band protection interval is thus needed, however idle frequency band is increasingly becoming resource the most rare；In face of
When diversified channel condition and heterogeneous network, the missing of waveform flexibility may become a main disadvantage.At one
Under the conditions of faulty channel synchronization, according to the waveform of time-frequency characteristic flexible design, the remaining timing error of time-frequency can be had
Stronger robustness.
2009, the team of Gerhard Fettweis proposed the frame structure (document 1 of GFDM systems for the first time：
《GFDM-Generalized Frequency Division Multiplexing》), primarily illustrate GFDM systems compared to
Advantage of the ofdm system in terms of peak-to-average power ratio and out-of-band power inhibition, but in transfer ratio when the problem of discussing peak-to-average force ratio
Under conditions of special number is consistent, the sub-carrier number of the two simultaneously differs, and due to the flexible parameter selection scheme of GFDM systems, peak is equal
Power ratio can change in a certain range.
2012, (N.Michailow was equal to 2012 in document 2 for the transmitting terminal and receiving end device of a kind of low complex degree
It is disclosed《Analysis of an alternative multi-carrier technique for next generation
cellular systems》) and document 3 (I.Gaspar be equal to 2013 disclosed in《Low Complexity GFDM
Receiver Based on Sparse Frequency Domain Processing》) in propose, this device is using efficient
FFT operations, so that the complexity of previous matrix operation is substantially reduced, and the physical significance of each step is definitely；It is connecing
The method of receiving end, this novel device sampling is matching method of reseptance, so the interference between subcarrier can be caused to occur, to carry
The performance of the system of liter needs a kind of performance for the method lifting system that subcarrier interference is eliminated.
(R.Datta was equal to disclosed in 2012 document 4《GFDM Interference Cancellation for
Flexible Cognitive Radio PHY Design》) propose unilateral and bilateral serial interference for GFDM systems and disappear
Except algorithm, thought is exactly that the interference for the adjacent subcarrier that MF receivers are introduced is eliminated, the elimination algorithm of sub-carriers
It is carried out successively from the 1st subcarrier to k-th subcarrier, this method may be considered single serial interference elimination and simultaneously
The mixing of row interference cancellation algorithm, document finally analyze the complexity of two kinds of algorithms.
2013, (Michailow, N. were equal to disclosed in 2013 document 5《G.Low peak-to-average power
ratio for next generation cellular systems with generalized frequency
division multiplexing Intelligent Signal Processing and Communications
Systems》) analyze the structure and PAPR that compared different system, including ofdm system, single-carrier frequency domain equalization system, list
Carrier wave Frequency Division Multiplexing system and GFDM systems illustrate that GFDM systems can regard the generalized form of three of the above system as, and
And select the PAPR performances of GFDM systems to be better than ofdm system by rational molding parameter, and formed filter parameter is got over
Greatly, the PAPR performances of system are more excellent.
Invention content
The present invention is to obtain more preferably bit error rate performance, and reduction peak-to-average power ratio, be based on to provide one kind
The signal of the GFDM systems of weighted score Fourier transformation emits and method of reseptance.
The signal of GFDM systems based on weighted score Fourier transformation emits and method of reseptance,
The K subcarrier that the GFDM systems include, each subcarrier have M subsymbol；K, M is positive integer；
This approach includes the following steps：
Step 1: in transmitting terminal, carry out the batch operation of subcarrier exponent number, to the data on each subcarrier into
The weighted score Fourier transformation of row-α ranks；
Step 2: by different subcarrier maps to user；
Step 3: carrying out GFDM modulation to data, i.e.,：The data of input are multiplied with GFDM modulation matrixs A, and are added
It is sent to channel after CP operations；
Step 4: receiving terminal carries out CP to signal and operates, then carry out after the signal for receiving step 3 transmission
GFDM demodulation operations obtain the data after GFDM demodulation；
Step 5: the data after the GFDM demodulation obtained to step 4 carry out demapping operation, carried according to the son of transmitting terminal
The distribution of wave exponent number exports after carrying out weighted score Fourier transformation corresponding with exponent number.
The signal of GFDM systems based on weighted score Fourier transformation emits and method of reseptance,
The K subcarrier that the GFDM systems include, each subcarrier have M subsymbol；K, M is positive integer；
This approach includes the following steps：
Step 1: in transmitting terminal, first the data on each subcarrier are carried out with the weighted score Fourier of 1- α ranks
Transformation, transforms data to frequency domain；
Step 2: being replicated to data in frequency domain, and it is arranged in order into the sequence that length is 2M, and letter is molded using RC
It is several that the sequence is molded；
Step 3: each subcarrier data is superimposed, and corresponding addition, generate the data that length is K × M；
Step 4: to step 3 obtain length be K × M data carry out IFFT transformation, after be sent to channel；
Step 5: receiving terminal receives the signal of transmitting terminal transmitting, and FFT transform is carried out to the data that length is K × M, obtained
Signal after must converting；
Step 6: extracting M data on each subcarrier, and carry out shifting function；
Step 7: the data after being shifted to step 6 using RC shaping functions are molded, signal after being molded；
Step 8: to defeated after the weighted score Fourier transformation of α -1 ranks of the data progress M points on each subcarrier
Go out.
In step 1, signal is transformed to frequency domain, Yi Jibu by the weighted score Fourier transformation that 1- α ranks are carried out in transmitting terminal
The inverse transformation of corresponding exponent number in rapid eight.
It in step 2, after carrying out forming processes, remains unchanged positioned at intermediate data, is distributed in " trapezoidal ", both sides
Data are 0, and " trapezoidal " length is related with shaping function parameter beta.
In step 3, each subcarrier data is superimposed, and during corresponding addition, interference comes from adjacent two
A subcarrier is located at " slope " section in " trapezoidal ", and as β=0, there is no interference between adjacent subcarrier.
After step 5, if receive signal process is fading channel, area block equalization operation is carried out to signal,
The area block equalization operation includes ZF equilibriums and MMSE balanced.
The present invention can according in channel state information, the flexible unit carrier block of user demand sub-carrier number and
WFRFT exponent numbers, and the exponent number in each subcarrier can keep difference to reach the demand of system performance.The present invention passes through
WFRFT precodings simultaneously reasonably select suitable transformation exponent number according to channel condition information, so that the system after coding is obtained more excellent
Bit error rate performance, and possess lower peak-to-average power ratio.
Description of the drawings
Fig. 1 is the WFRFT-GFDM system schematics of broad sense；
Fig. 2 is the WFRFT-GFDM system schematics of low complex degree；
Fig. 3 is the filter and receiving end signal amplitude and noise amplitude contrast schematic diagram of GFDM transmitting-receiving two-ends；
Fig. 4 is performance comparison schematic diagram of the GFDM systems of the WFRFT precodings of QPSK modulation under awgn channel；
Fig. 5 is performance of the GFDM systems for the WFRFT precodings that the BPSK with ZF equilibriums is modulated under double discrete channels
Emulate schematic diagram；
Fig. 6 is performance of the GFDM systems for the WFRFT precodings that the 16QAM with ZF equilibriums is modulated under double discrete channels
Emulate schematic diagram；
Fig. 7 is property of the GFDM systems for the WFRFT precodings that the BPSK with MMSE equilibriums is modulated under double discrete channels
Schematic diagram can be emulated；
Fig. 8 is property of the GFDM systems for the WFRFT precodings that the 16QAM with MMSE equilibriums is modulated under double discrete channels
Schematic diagram can be emulated；
Fig. 9 is the PAPR emulation schematic diagrames of the GFDM systems of the WFRF precodings of different rank；
Specific implementation mode
Specific implementation mode one is illustrated with reference to Fig. 1 present embodiment, the GFDM based on weighted score Fourier transformation
The signal of system emits and method of reseptance,
The K subcarrier that the GFDM systems include, each subcarrier have M subsymbol；K, M is positive integer；
This approach includes the following steps：
Step 1: carrying out the batch operation of subcarrier exponent number in transmitting terminal, that is, it is directed to the K son that original GFDM systems include and carries
M subsymbol on wave and each subcarrier implements different WFRFT exponent numbers, can flexibly choose according to demand in this way
Parameter, the present invention in for ease of analyzing and simplifying system, to the weighted score of the data progress-α ranks on each subcarrier
Fourier transformation；
Step 2: carrying out subcarrier maps, different users can be given different sections of subcarrier maps, also can according to
The demand at family flexibly chooses WFRFT parameters and subcarrier length, and this patent sets number of users to be applied alone to analyze simplicity
Family；
Step 3: carrying out GFDM modulation to data, i.e., the data of input are multiplied with GFDM modulation matrixs A, then into
Row plus CP operations；
Step 4: in data after wireless channel, CP is carried out first and is operated, then carries out GFDM demodulation operations, specifically
There are three types of forms, there is matching receiver, ZF receivers and MMSE receivers；
Step 5: after demapping operation, the matching of subcarrier exponent number is considered, carry out add corresponding with receiving terminal exponent number
Weigh fractional fourier transform.
Since in the above process, the solution of matrix A is extremely complex, and dimension is unfavorable for greatly inversion operation, if matrix A is not present
Inverse matrix, it is possible to which having document 6, (Matthe, M were equal to disclosed in 2014《G.Generalized Frequency
Division Multiplexing in a Gabor Transform Setting Communications Letters》) in
The not applicable situation of the ZF and MMSE receivers, and GFDM modulation physical significances and process are carried out to data with matrix A
It is indefinite, so the present invention proposes signal transmitting and the method for reseptance of the WFRFT-GFDM systems of the low complex degree in Fig. 2, connect
Receipts machine is matched filtering (MF) receiver, specific implementation mode two.
Specific implementation mode two, the signal transmitting of GFDM systems based on weighted score Fourier transformation and method of reseptance,
Step 1：In transmitting terminal as the operating procedure in Fig. 1, it is assumed that is carried out on each subcarrier is phase same order
Several WFRFT transformation and number of users are single user, the data on each subcarrier are carried out with the WFRFT of 1- α ranks, data
Transform to frequency domain；
Step 2：Data are replicated in frequency domain, and are arranged in order, the length of existing sequence is 2M, and RC is used in combination to be molded letter
Number is molded the signal of a length of 2M, and intermediate data remain unchanged after molding, and two side datas are 0, and intermediate data is in " tiltedly
Slope " shape, and " slope " length is related with shaping function parameter beta；
Step 3：The corresponding data length of each subcarrier is 2M at this time, and each subcarrier data is superimposed
It corresponds to and is added, wherein most is the data of constant middle section, and interference comes from the " oblique of two adjacent subcarriers
Slope " section, as β=0, there is no interference between adjacent subcarrier；
Step 4：After all data are superimposed as required, IFFT operations are carried out to the data of the KM length of generation and are just obtained
Signal to be transmitted；
Step 5：After channel, FFT operations are carried out to the data that length is KM；
Step 6：If by fading channel, area block equalization operation, including ZF equilibriums and MMSE are carried out to signal at this
It is balanced
Step 7：M data on each subcarrier are extracted, (fftshift) operation is shifted to data, due to
2 times of over-samplings operation of transmitting terminal before, interference at this time are located at data interlude, and both sides are constant data；
Step 8：It is molded again with receiving terminal RC shaping functions, forming operation makes interfering between adjacent carrier twice
To be obviously reduced, and the data being at " slope " reduce amplitude and are not obvious；
Step 9：Data on each subcarrier are carried out with the WFRFT operations of α -1 ranks of M points.
The present invention is applied in the GFDM systems based on 4-WFRFT.
Abbreviation and Key Term definition in the present invention：
WFRFT：Weighted-type fractional Fourier transform, weight score Fourier conversion；
GFDM：Generalized Frequency Division Multiplexing, broad sense frequency division multiplexing；
HC：Hybrid Carrier, mixed carrier；
BER：Bit Error Rate, the bit error rate；
PAPR：Peak to Average Power Ratio, peak-to-average power ratio；
ZF：Zero Forcing, force zero；
MMSE：Minimum Mean Square Error, least mean-square error.
The GFDM skills of the discrete four-item weight score Fourier transformation (WFRFT) of technology envelope and classics that the present invention uses
Art.
WFRFT is theoretical：
It is the discrete signal d of N for length, then the discrete four-item weight score Fourier transformation of the α ranks of d is：Fα[d]=Wα
[d], wherein FαIndicate four-item weight score Fourier transformation, WαIt is weighting matrix, in the case where ambiguity will not be caused, at this
In invention, WαIt is abbreviated as W, is expressed as：
W=A0 αI+A1 αF+A2 αΓI+A3 αΓF (1)
Here A0 α~A3 αIt is that weighting coefficient is defined as follows：
I is N × N unit matrixs, and F is N × N Discrete Fourier transforms.Γ is permutation matrix, it is per each row of a line
Only there are one element non-zeros, specifically can be as follows with table：
In addition weighted score inverse Fourier transform can be expressed as：F-α[d]=W-α[d], wherein W-αIndicate WαInverse square
Battle array, can prove that W is a unitary matrice, then according to the property of unitary matrice, W-1=WH.And it can prove matrix WαMeet transformation
The additive property of exponent number, i.e. Wα+β=WαWβ.It should be pointed out that the mixed carrier system that the present invention refers to is converted by WFRFT
It realizes.
GFDM systems：
For GFDM systems, N=K*M symbol is distributed on K subcarrier, and each subcarrier has M subsymbol, dk,m
Indicate that m-th of subsymbol on k-th of subcarrier, each data carry out corresponding pulse-shaping operation, formed filter can
To be expressed as
Each gk,m[n] is all the offset of ptototype filter g (n) times and frequency.Symbol to be transmitted can indicate
For,
It can be expressed as with the form of matrix：
X=Ad (6)
Wherein：A is the transmission matrix of KM*KM, can be expressed as A=(g0,0…gK-1,0g0,1…gK-1,M-1).In receiving terminal,
After channel equalization, receiving signal can be expressed as：
For GFDM demodulators, there are three kinds of demodulation methods：
(1), receiver (MF) B is matchedMF=AH, this reception mode maximizes the signal-to-noise ratio of each subcarrier, but
Be especially when application non-orthogonal transmission pulse when, inter-carrier interference can be introduced, keep the error performance of system poor.
(2), ZF is received, BZF=A-1.This reception mode can completely remove the self-interference of system, and (i.e. intercarrier is dry
Disturb), but interchannel noise can be reinforced.And this mode must assure that matrix A is reversible, and when matrix A dimension compared with
When big, the complexity of system is higher.
(3), MMSE is received.This balanced way can in self-interference and
Noise is compromised between reinforcing.
After this, document 2~3 proposes a kind of mounted cast of the transmitting-receiving two-end of the GFDM systems of low complex degree, this
Kind of realization method is equivalent to efficient DFT operations realization matrix A, and the physical significance of matrix A and indefinite, this to use this
The mode of kind of FFT can definitely each section physical significance.
In GFDM systems, certain is with the interference of specific subcarrier only from two adjacent sub- loads of its " left and right "
The interference of data on wave.Under conditions of the RC formed filters of β=0.3, useful signal on each subcarrier and dry
The big logotype for disturbing signal is as shown in Figure 3.
As shown in figure 3, when the power of useful signal does not lose, also it is not present between subcarrier on the symbolic point
Interference, but when the power loss of useful signal is bigger, interference is also bigger, this also just makes the signal on the determination point dry
It disturbs and becomes smaller in terms of " positive and negative " two than (SINR), is i.e. the available signal power jamming power that becomes smaller becomes larger.And then it is understood that being
The bit error rate of system and the signal-to-noise ratio of system are closely related, so the error ratio characteristic of GFDM systems just can be due to these two aspects
Effect and decline.The method of the bit error rate of existing promotion GFDM systems only considers the interference between reduction subcarrier, and
Based on the pattern of serial interference elimination, there is also the high disadvantages of complexity.
The mode of present invention application WFRFT precodings realizes the multiple target combined optimization problem of GFDM systems.On the one hand
The it is proposed of GFDM systems is the high out-of-band power problem based on ofdm system, and the peak that another aspect ofdm system faces itself is equal
The shortcomings that power ratio, and the characteristic of system is not embodied well under the conditions of double discrete channels.This patent utilizes
WFRFT exponent number adjustabilitys make GFDM systems error rate of system promotion under the conditions of keeping it in doubly selective channel of WFRFT precodings
Or it is constant under conditions of, effectively reduce its PAPR, and do not influence its out-of-band power inhibition.
As shown in figure 4, GFDM systems are since pulse-shaping operates, it is no longer orthogonal between subcarrier, and with molding parameter
Increase, the self-interference between the subcarrier of generation also increases therewith, and the influence to error rate of system is also bigger, is given respectively in figure
Go out under same pulse-shaping Parameter Conditions, the bit error rate performance of different WFRFT exponent numbers.Traditional GFDM systems (α=0) due to
FFT transform can be evenly distributed to the self-interference of generation on each subcarrier, therefore its best performance, with the increasing of transformation exponent number
Add (by α=0 to α=1) WFRFT system performances under the conditions of awgn channel worse and worse.
The GFDM systems that the WFRFT precodings of the modulation of the BPSK/16QAM with ZF equilibriums are set forth in Fig. 5 and Fig. 6 exist
Performance under double discrete channels, channel model is ITU PED-B channels, including 3 Rayleigh fading diameters, maximum doppler frequency are
The delay of 33Hz, 2,3 diameters are 10ns and 20ns, and power gain is -3.6dB and -7.2dB.As shown in analogous diagram, with modulation order
Several increases, the difference between the GFDM error rate of systems of different rank WFRFT precodings taper into, until difference is little.
This be as caused by 2 reasons, on the one hand under awgn channel model, GFDM systems best performance at (α=0)；Another party
Face, under double discrete channel models, its distinctive property due to WFRFT, in some exponent number αoptIt is upper mutually to agree with channel parameter,
It can obtain and the similar performance in α=0 and α=1.
Fig. 7 and Fig. 8 gives the property of the GFDM systems of the WFRFT precodings of the modulation of the BPSK/16QAM with MMSE equilibriums
Energy.It is consistent when channel parameter in Fig. 7 and ZF equilibriums, under BPSK modulating modes, the performances of fractional order α=0.5 are more excellent, and
Due to traditional GFDM systems (α=0).Channel model ITU Veh-B channel models in Fig. 8：There are 6 Rayleigh fading diameters, when
Prolong respectively 0,310,710,1090,1730,2510ns, average path gain is respectively 0, -1.0, -9.0, -10.0, -
15.0, -20.0dB, sample frequency 10MHz, car speed 120km/h.Under this channel model 16QAM modulation be
System, the performances of α=0.5 are more excellent, its same performance is better than traditional GFDM systems (α=0).
So under doubly selective channel Model Condition, the GFDM systems of WFRFT precodings can reach ratio on some exponent number
Traditional GFDM systems (α=0) are similar or more preferably bit error rate performance.
Another advantage of WFRFT is utilized in Fig. 9, you can with the peak-to-average power ratio of flexible regulating system.In score field (α
=0.3 and α=0.5), the PAPR of GFDM systems can be effectively reduced.
Comprehensive analysis Fig. 5-9 can be obtained, and the GFDM systems of WFRFT precodings are while being promoted or not influencing error rate of system
The PAPR that system can be effectively reduced realizes the joint performance boost problem about the multiple target of GFDM systems.And then
The select permeability of optimized parameter is carried out during the realization of multiple target according to concrete implementation target.
The system of the present invention is the form of the broad sense of traditional GFDM systems, which takes full advantage of in weighted score Fu
The exponent number adjustability of leaf transformation come make GFDM systems have more broadly performance, including lower PAPR and Complex Channel model under
Preferable bit error rate performance.
The present invention and the difference of document 4 are to propose a kind of the GFDM systems and its low complex degree of WFRFT precodings
Form, the analysis of validity has been carried out to the performance of the bit error rate under doubly selective channel.
WFRFT-GFDM systems proposed by the present invention by parameter be adjusted flexibly and select can be equivalent to more broad sense
Three kinds of systems merging.
The present invention contributes to the Mixed Design of waveform and application under 5G systems.
Claims (7)
1. the signal of the GFDM systems based on weighted score Fourier transformation emits and method of reseptance, it is characterized in that：
The K subcarrier that GFDM (broad sense frequency division multiplexing) system includes, each subcarrier have M subsymbol；K, M is
Positive integer；
This approach includes the following steps：
Step 1: in transmitting terminal, the batch operation of subcarrier exponent number is carried out, to the data progress-α ranks on each subcarrier
Weighted score Fourier transformation；
Step 2: by different subcarrier maps to user；
Step 3: carrying out GFDM modulation to data, i.e.,：The data of input are multiplied with GFDM modulation matrixs A, and carry out adding CP behaviour
Channel is sent to after work；
Step 4: receiving terminal carries out CP (cyclic prefix) operations after the signal for receiving step 3 transmission, to signal, then
GFDM demodulation operations are carried out, the data after GFDM demodulation are obtained；
Step 5: the data after the GFDM demodulation obtained to step 4 carry out demapping operation, according to the subcarrier rank of transmitting terminal
Number distribution exports after carrying out weighted score Fourier transformation corresponding with exponent number.
2. the signal of the GFDM systems according to claim 1 based on weighted score Fourier transformation emits and recipient
Method, it is characterised in that in step 2, different subcarrier maps are chosen to WFRFT (weighting Fu according to the demand of user to user
Vertical leaf transformation) parameter and subcarrier length carries out.
3. the signal of the GFDM systems according to claim 1 based on weighted score Fourier transformation emits and recipient
Method, it is characterised in that the receiver of receiving terminal is that matching receiver, ZF (force zero) receivers or MMSE (least mean-square error) connect
Receipts machine.
4. the signal of the GFDM systems based on weighted score Fourier transformation emits and method of reseptance, it is characterized in that：
The K subcarrier that the GFDM systems include, each subcarrier have M subsymbol；K, M is positive integer；
This approach includes the following steps：
Step 1: in transmitting terminal, the weighted score Fourier that first data on each subcarrier are carried out with 1- α ranks becomes
It changes, transforms data to frequency domain；
Step 2: being replicated to data in frequency domain, and it is arranged in order into the sequence that length is 2M, and utilizes RC shaping functions pair
The sequence is molded；
Step 3: each subcarrier data is superimposed, and corresponding addition, generate the data that length is K × M；
Step 4: to step 3 obtain length be K × M data carry out IFFT transformation, after be sent to channel；
Step 5: receiving terminal receives the signal of transmitting terminal transmitting, and FFT transform is carried out to the data that length is K × M, is become
Signal after changing；
Step 6: extracting M data on each subcarrier, and carry out shifting function；
Step 7: the data after being shifted to step 6 using RC shaping functions are molded, signal after being molded；
Step 8: to being exported after the weighted score Fourier transformation of α -1 ranks of the data progress M points on each subcarrier.
5. the signal of the GFDM systems according to claim 4 based on weighted score Fourier transformation emits and recipient
Method, it is characterised in that in step 2, after carrying out forming processes, remain unchanged, be distributed in " trapezoidal ", two positioned at intermediate data
The data of side are 0, and " trapezoidal " length is related with shaping function parameter beta.
6. the signal of the GFDM systems according to claim 4 based on weighted score Fourier transformation emits and recipient
Method, it is characterised in that in step 3, each subcarrier data is superimposed, and during corresponding addition, interference comes from
Two neighboring subcarrier is located at " slope " section in " trapezoidal ", is not present between adjacent subcarrier when shaping function parameter beta=0
Interference.
7. the signal of the GFDM systems according to claim 4 based on weighted score Fourier transformation emits and recipient
Method, it is characterised in that after step 5, if receive signal process is fading channel, frequency domain block balance is carried out to signal
Operation, the area block equalization operation include ZF equilibriums and MMSE balanced.
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| CN106254292B (en) * | 2016-07-22 | 2019-03-08 | 重庆邮电大学 | Reduction PAPR algorithm based on the distribution of stochastic filtering device in GFDM system |
| CN106330277B (en) * | 2016-08-26 | 2019-06-21 | 西安电子科技大学 | Related rotation method for precoding applied to GFDM communication system |
| CN106789806A (en) * | 2016-11-24 | 2017-05-31 | 哈尔滨工业大学 | WFRFT mixed carrier system out-of-band power suppressing methods based on frequency domain precoding |
| CN106953822B (en) * | 2017-03-06 | 2019-12-10 | 哈尔滨工程大学 | novel generalized multi-carrier communication method suitable for time-frequency double-selective fading channel |
| CN107181712A (en) * | 2017-04-26 | 2017-09-19 | 重庆邮电大学 | A kind of GFDM signal PAPR suppressing methods based on pre-coding matrix |
| CN107682296B (en) * | 2017-08-17 | 2020-06-30 | 天津大学 | MMSE (minimum mean square error) receiving method and device suitable for GFDM (ground fault frequency division multiplexing) system of FSC (frequency selective modulation) |
| CN107426122A (en) * | 2017-09-07 | 2017-12-01 | 西安电子科技大学 | Low complex degree minimum mean-squared error algorithm method for GFDM systems |
| CN108462559A (en) * | 2018-03-16 | 2018-08-28 | 西安电子科技大学 | The method that out-of-band radiation is reduced based on IA-PFT in GFDM systems |
| CN108920419B (en) * | 2018-06-20 | 2022-03-01 | 沈阳理工大学 | Fractional order Fourier inverse transformation hierarchical scanning method based on single parameter |
| CN108900280B (en) * | 2018-06-22 | 2020-12-11 | 达新宇 | Novel adaptive code modulation method combined with WFRFT (frequency-weighted round robin) preprocessing and wireless communication system |
| CN109462443B (en) * | 2018-12-05 | 2021-07-02 | 唐山照澜海洋科技有限公司 | 5G multi-carrier underwater acoustic communication method |
| CN111314915B (en) * | 2020-02-10 | 2023-04-18 | 沈阳理工大学 | High-definition authentication method suitable for wireless communication system |
| CN112367286B (en) * | 2020-10-29 | 2022-04-12 | 哈尔滨工业大学 | Discrete multi-term weighted fractional Fourier expansion OFDM communication method |
| CN112714090B (en) * | 2020-12-23 | 2022-07-19 | 哈尔滨工业大学 | Transmission method of weighted fractional Fourier transform extended hybrid carrier |
| CN112995085B (en) * | 2021-02-08 | 2022-06-03 | 重庆邮电大学 | GFDM carrier system optimization method based on FW-CCDF algorithm |
| CN113301565B (en) * | 2021-05-25 | 2023-04-25 | 哈尔滨工业大学 | Waveform diversity safe transmission method and system based on expansion weighted fractional Fourier transform |
| CN114024815B (en) * | 2021-11-02 | 2024-02-06 | 哈尔滨工业大学 | Carrier system compatibility-oriented double-layer fractional Fourier transform signal transmission method |
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| CN104836772A (en) * | 2015-06-02 | 2015-08-12 | 哈尔滨工业大学 | Signal transmission and reception method capable of performing combined suppressing on peak-to-average power ratio and out-of-band power based on mixed carrier system |
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| CN102340476A (en) * | 2011-07-14 | 2012-02-01 | 哈尔滨工业大学 | OFDM (Orthogonal Frequency Division Multiplexing) communication system based on weighted score Fourier transform expansion |
| CN103746804A (en) * | 2014-01-17 | 2014-04-23 | 哈尔滨工业大学 | Secure communication method based on multi-parameter fractional Fourier transform and constellation scrambling |
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