CN105530217A - Signal emission and reception method of GFDM system based on weight fraction Fourier transform - Google Patents

Signal emission and reception method of GFDM system based on weight fraction Fourier transform Download PDF

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CN105530217A
CN105530217A CN201610052207.2A CN201610052207A CN105530217A CN 105530217 A CN105530217 A CN 105530217A CN 201610052207 A CN201610052207 A CN 201610052207A CN 105530217 A CN105530217 A CN 105530217A
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gfdm
data
subcarrier
fourier transform
signal
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CN201610052207.2A
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CN105530217B (en
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梅林�
王震铎
王晓鲁
沙学军
张乃通
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哈尔滨工业大学
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2614Peak power aspects
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2626Arrangements specific to the transmitter only
    • H04L27/2627Modulators
    • H04L27/2628Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver only
    • H04L27/2649Demodulators
    • H04L27/265Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators

Abstract

The invention discloses a signal emission and reception method of a GFDM system based on weight fraction Fourier transform, relating to the signal emission and reception technology of the GFDM system based on the weight fraction Fourier transform. The invention can obtain better bit error rate and reduces the peak-to-average power ratio. The invention can flexibly regulate the subcarrier and the WFRFT order in the unit carrier wave block according to the channel state information and user demands, and the order in each subcarrier can maintain different in order to achieve to the need of the system performance. Besides, the invention performs precoding through WFRFT and reasonably chooses the appropriate transformation order according to the channel condition, which enables the encoded system to obtain a better bit error rate performance and have lower peak-to-average power ratio.

Description

Based on the signal transmitting and receiving method of the GFDM system of weighted score Fourier transform
Technical field
The present invention relates to the signal transmitting and receiving technology of the GFDM system based on weighted score Fourier transform.
Background technology
GFDM carrier wave system is a kind of a kind of new carrier wave system of the 5G technology for future, and it develops based on OFDM technology, is developed further by filtering multi-transceiver technology.In the 5G communication system in future, more and more focus on the combination of many scenes, as the communication network and heterogeneous network etc. of M2M and more crypto set complexity, and need higher transmission rate, the shorter response time, and transmit more data under limited frequency spectrum resource, this is a challenge to the OFDM technology that 4G technology is relied on.According to the scene demand of 5G, the main shortcoming of OFDM technology is exactly larger out-of-band power radiation and the flexibility lacking waveform.Larger out-of-band power radiation can produce interference to the data on adjacent frequency band, and data can be made to produce distortion, so just need larger frequency band protection interval, but the frequency band of free time becomes resource the most rare just gradually; When in the face of diversified channel condition and heterogeneous network, the disappearance of waveform flexibility may become a main shortcoming.Under a faulty channel synchronization condition, according to the waveform of time-frequency characteristic flexible design, the timing error that can remain time-frequency has stronger robustness.
2009, the team of GerhardFettweis proposes the frame structure (document 1: " GFDM-GeneralizedFrequencyDivisionMultiplexing ") of GFDM system first time, mainly describe GFDM system compared to the advantage of ofdm system in peak-to-average power ratio and out-of-band power suppression, but when discussing the problem of peak-to-average force ratio under the consistent condition of transmitted bit number, the sub-carrier number of the two is not identical, due to GFDM system Selecting parameter scheme flexibly, its peak-to-average power ratio can change in certain scope.
2012, a kind of transmitting terminal of low complex degree and receiving end device propose in document 2 (N.Michailow equals " Analysisofanalternativemulti-carriertechniquefornextgene rationcellularsystems " disclosed in 2012) and document 3 (I.Gaspar equals " LowComplexityGFDMReceiverBasedonSparseFrequencyDomainPro cessing " disclosed in 2013), this device utilizes efficient FFT computing, the complexity of previous matrix operation is reduced greatly, and the physical significance of each step definitely, at receiving terminal, the method for this novel device sampling is coupling method of reseptance, so the interference between subcarrier can be caused to occur, is the performance of elevator system, the performance of the method elevator system needing a kind of subcarrier interference to eliminate.
Document 4 (R.Datta equals " GFDMInterferenceCancellationforFlexibleCognitiveRadioPHY Design " disclosed in 2012) proposes monolateral and bilateral serial interference elimination algorithm for GFDM system, its thought is exactly that the interference of the adjacent subcarrier of MF receiver introducing is eliminated, the elimination algorithm of its sub-carriers carries out from the 1st subcarrier successively to K subcarrier, this method can think the mixing of single serial interference elimination and parallel interference canceller algorithm, document is finally analyzed the complexity of two kinds of algorithms.
2013, document 5 (Michailow, N. " G.Lowpeak-to-averagepowerratiofornextgenerationcellulars ystemswithgeneralizedfrequencydivisionmultiplexingIntell igentSignalProcessingandCommunicationsSystems " disclosed in 2013 is equaled) analyze the structure and the PAPR that compared for different system, comprise ofdm system, single-carrier frequency domain equalization system, single carrier frequency division multiplexing system and GFDM system, describe the generalized form that GFDM system can regard above three kinds of systems as, and select the PAPR performance of GFDM system to be better than ofdm system by rational molding parameter, and formed filter parameter is larger, the PAPR performance of system is more excellent.
Summary of the invention
The present invention is to obtain more excellent bit error rate performance, and reduces peak-to-average power ratio, thus provides a kind of signal transmitting and receiving method of the GFDM system based on weighted score Fourier transform.
Based on the signal transmitting and receiving method of the GFDM system of weighted score Fourier transform,
K the subcarrier that described GFDM system comprises, each subcarrier has M subsymbol; K, M are positive integer;
The method comprises the following steps:
Step one, at transmitting terminal, carry out the batch operation of subcarrier exponent number, the data on each subcarrier are carried out to the weighted score Fourier transform on-α rank;
Step 2, different subcarriers is mapped to user;
Step 3, GFDM modulation is carried out to data, that is: the data of input are multiplied with GFDM modulation matrix A, and carry out adding after CP operates and be sent to channel;
Step 4, receiving terminal, after the signal receiving step 3 transmission, go CP to operate to signal, then carry out GFDM demodulation operation, obtain the data after GFDM demodulation;
Data after step 5, the GFDM demodulation that obtains step 4 carry out demapping operation, according to the subcarrier exponent number of transmitting terminal distribute carry out the weighted score Fourier transform corresponding with exponent number after export.
Based on the signal transmitting and receiving method of the GFDM system of weighted score Fourier transform,
K the subcarrier that described GFDM system comprises, each subcarrier has M subsymbol; K, M are positive integer;
The method comprises the following steps:
Step one, at transmitting terminal, first the data on each subcarrier are all carried out to the weighted score Fourier transform on 1-α rank, by data transformation to frequency domain;
Step 2, at frequency domain, data to be copied, and be arranged in order into the sequence that length is 2M, and utilize RC shaping function to carry out shaping to this sequence;
Step 3, to be superimposed by each subcarrier data, and to be correspondingly added, generating length is the data of K × M;
Step 4, the length obtained step 3 are that the data of K × M carry out IFFT conversion, after be sent to channel;
Step 5, receiving terminal receive the signal that transmitting terminal is launched, and carry out FFT conversion to the data that length is K × M, obtain the signal after conversion;
Step 6, M the data extracted on each subcarrier, and carry out shifting function;
Step 7, utilize RC shaping function to step 6 displacement after data carry out shaping, obtain shaping rear signal;
Step 8, the data on each subcarrier are carried out M point α-1 rank weighted score Fourier transform after export.
In step one, the weighted score Fourier transform of carrying out 1-α rank at transmitting terminal transforms to frequency domain signal, and the inverse transformation of corresponding exponent number in step 8.
In step 2, after carrying out forming processes, be positioned at middle data and remain unchanged, the distribution in " trapezoidal ", the data of both sides are 0, and the length of described " trapezoidal " is relevant with shaping function parameter beta.
In step 3, each subcarrier data is superimposed, and in the corresponding process be added, interference comes from " slope " section that adjacent two subcarriers are arranged in " trapezoidal ", there is not interference between the subcarrier adjacent when β=0.
After step 5, if Received signal strength process is fading channel, then carry out area block equalization operation to signal, described area block equalization operation comprises ZF equilibrium and MMSE equilibrium.
The present invention can according to the sub-carrier number in channel condition information, user's request flexibly unit carrier block and WFRFT exponent number, and the exponent number in each subcarrier can keep different to reach the demand of systematic function.The present invention is by WFRFT precoding and reasonably select suitable conversion exponent number according to channel condition information, makes the system after coding obtain more excellent bit error rate performance, and has lower peak-to-average power ratio.
Accompanying drawing explanation
Fig. 1 is the WFRFT-GFDM system schematic of broad sense;
Fig. 2 is the WFRFT-GFDM system schematic of low complex degree;
Fig. 3 is that the filter of GFDM transmitting-receiving two-end and receiving end signal amplitude and noise amplitude contrast schematic diagram;
Fig. 4 is the performance comparison schematic diagram of GFDM system under awgn channel of the WFRFT precoding of QPSK modulation;
Fig. 5 is the performance simulation schematic diagram of GFDM system under two discrete channel of the WFRFT precoding of modulating with the BPSK of ZF equilibrium;
Fig. 6 is the performance simulation schematic diagram of GFDM system under two discrete channel of the WFRFT precoding of modulating with the 16QAM of ZF equilibrium;
Fig. 7 is the performance simulation schematic diagram of GFDM system under two discrete channel of the WFRFT precoding of modulating with the BPSK of MMSE equilibrium;
Fig. 8 is the performance simulation schematic diagram of GFDM system under two discrete channel of the WFRFT precoding of modulating with the 16QAM of MMSE equilibrium;
Fig. 9 is that the PAPR of the GFDM system of the WFRF precoding of different rank emulates schematic diagram;
Embodiment
Embodiment one, composition graphs 1 illustrate this embodiment, based on the signal transmitting and receiving method of the GFDM system of weighted score Fourier transform,
K the subcarrier that described GFDM system comprises, each subcarrier has M subsymbol; K, M are positive integer;
The method comprises the following steps:
Step one, carry out the batch operation of subcarrier exponent number at transmitting terminal, namely for K the subcarrier that former GFDM system comprises, different WFRFT exponent numbers is implemented with the subsymbol of the M on each subcarrier, like this can Selecting All Parameters flexibly according to demand, for ease of analyzing and simplifying system in the present invention, the data on each subcarrier are carried out to the weighted score Fourier transform on-α rank;
Step 2, carry out subcarrier mapping, can the subcarrier of different section be mapped to different users, also can choose WFRFT parameter and subcarrier length flexibly according to the demand of user, this patent be easy in order to analyze, and setting number of users is single user;
Step 3, GFDM modulation is carried out to data, namely the data of input are multiplied with GFDM modulation matrix A, then carry out adding CP and operate;
Step 4, in data after wireless channel, first carry out CP operation, then carry out GFDM demodulation operation, specifically have three kinds of forms, have coupling receiver, ZF receiver and MMSE receiver;
Step 5, after demapping operation, consider subcarrier exponent number coupling, carry out the weighted score Fourier transform corresponding with receiving terminal exponent number.
Due in said process, solving of matrix A is very complicated, dimension is unfavorable for inversion operation greatly, if there is not inverse matrix in matrix A, likely can there is document 6 (Matthe, M equals " G.GeneralizedFrequencyDivisionMultiplexinginaGaborTransf ormSettingCommunicationsLetters " disclosed in 2014) described in the inapplicable situation of ZF and MMSE receiver, and with matrix A to data carry out GFDM modulate physical significance and process indefinite, so the present invention proposes the signal transmitting and receiving method of the WFRFT-GFDM system of the low complex degree in Fig. 2, receiver is matched filtering (MF) receiver, embodiment two.
Embodiment two, signal transmitting and receiving method based on the GFDM system of weighted score Fourier transform,
Step one: at transmitting terminal as the operating procedure in Fig. 1, suppose each subcarrier carries out be the WFRFT conversion of identical exponent number and number of users is single user, data on each subcarrier are carried out to the WFRFT on 1-α rank, transform the data into frequency domain;
Step 2: data are copied at frequency domain, and be arranged in order, the length of existing sequence is 2M, and carry out shaping with RC shaping function for the signal that length is 2M, the data of shaping rear centre remain unchanged, two side datas are 0, and intermediate data is in " slope " shape, and " slope " length is relevant with shaping function parameter beta;
Step 3: the data length that now each subcarrier is corresponding is 2M, each subcarrier data is superimposed corresponding addition, wherein the overwhelming majority is the data of constant mid portion, and interference comes from " slope " section of two adjacent subcarriers, there is not interference between the subcarrier adjacent when β=0;
Step 4: after all data superpose on request, carries out IFFT operation to the data of the KM length generated and just obtains signal waiting for transmission;
Step 5: after channel, carries out FFT operation to the data that length is KM;
Step 6: if through fading channel, carries out area block equalization operation at this to signal, comprises ZF equilibrium and MMSE equilibrium
Step 7: extract M data on each subcarrier, to be shifted (fftshift) operation to data, due to 2 times of over-samplings operations of transmitting terminal before, interference is now positioned at data interlude, and both sides are constant data;
Step 8: carry out shaping with receiving terminal RC shaping function again, twice forming operation makes the interference between adjacent carrier be able to obvious reduction, and the data being in " slope " place reduce amplitude not obvious;
Step 9: the WFRFT operation data on each subcarrier being carried out to α-1 rank of M point.
The present invention is applied in the GFDM system based on 4-WFRFT.
Abbreviation and Key Term definition in the present invention:
WFRFT:Weighted-typefractionalFouriertransform, weight score Fourier conversion;
GFDM:GeneralizedFrequencyDivisionMultiplexing, broad sense frequency division multiplexing;
HC:HybridCarrier, mixed carrier;
BER:BitErrorRate, the error rate;
PAPR:PeaktoAveragePowerRatio, peak-to-average power ratio;
ZF:ZeroForcing, ZF;
MMSE:MinimumMeanSquareError, least mean-square error.
The discrete four-item weight score Fourier transform (WFRFT) of the technology envelope that the present invention uses and classical GFDM technology.
WFRFT is theoretical:
For the discrete signal d that length is N, then the discrete four-item weight score Fourier transform in the α rank of d is: F α[d]=W α[d], wherein F αrepresent four-item weight score Fourier transform, W αweighting matrix, when ambiguity can not be caused, in the present invention, W αreferred to as W, be expressed as:
W=A 0 αI+A 1 αF+A 2 αΓI+A 3 αΓF(1)
Here A 0 α~ A 3 αthat weight coefficient is defined as follows:
A k α = c o s ( ( α - k ) π 4 ) c o s ( 2 ( α - k ) π 4 ) exp ( 3 ( α - k ) π i 4 ) , ( k = 0 , 1 , 2 , 3 ) - - - ( 2 )
I is N × N unit matrix, and F is N × N Discrete Fourier transform.Γ is permutation matrix, and each row of its every a line only have an element non-zero, specifically can show as follows:
Weighted score inverse Fourier transform can be expressed as in addition: F [d]=W [d], wherein W represent W αinverse matrix, can prove that W is a unitary matrice, then according to the character of unitary matrice, W -1=W h.And can matrix W be proved αmeet the additive property of conversion exponent number, i.e. W alpha+beta=W αw β.It is pointed out that the mixed carrier system that the present invention mentions is realized by WFRFT conversion.
GFDM system:
For GFDM system, N=K*M symbol, be distributed on K subcarrier, each subcarrier has M subsymbol, d k,mrepresent m subsymbol on a kth subcarrier, each data carries out corresponding pulse-shaping operation, and formed filter can be expressed as
g k , m [ n ] = g [ ( n - m k ) mod N ] · exp [ - j 2 π k K n ] - - - ( 4 )
Each g k,m[n] is all the skew of prototype filter g (n) time and frequency.Symbol waiting for transmission just can be expressed as,
x ( n ) = Σ k = 0 K - 1 Σ m = 0 M - 1 g k , m [ n ] d k , m , n = 0 , ... , N - 1 - - - ( 5 )
Can be expressed as by the form of matrix:
x=A·d(6)
Wherein: A is the transmission matrix of KM*KM, can be expressed as A=(g 0,0g k-1,0g 0,1g k-1, M-1).At receiving terminal, after channel equalization, Received signal strength can be expressed as:
d ^ = B ( A d + w ^ ) - - - ( 7 )
For GFDM demodulator, there are three kinds of demodulation methods:
(1), receiver (MF) B is mated mF=A h, this receive mode maximizes the signal to noise ratio of each subcarrier, but especially when applying non-orthogonal transmission pulse, can introduce inter-carrier interference, make the error performance of system poor.
(2), ZF receive, B zF=A -1.This receive mode can remove the self-interference (i.e. inter-carrier interference) of system completely, but can strengthen interchannel noise.And this mode must ensure that matrix A is reversible, and when matrix A dimension is larger, the complexity of system is higher.
(3), MMSE receives. this balanced way can be compromised between self-interference and noise are strengthened.
After this, document 2 ~ 3 proposes a kind of mounted cast of transmitting-receiving two-end of GFDM system of low complex degree, this implementation is equivalent to efficient DFT computing realization matrix A, and the physical significance of matrix A is also indefinite, this mode with this FFT can the physical significance of definitely each several part.
In GFDM system, certain only comes from the interference of data on the adjacent subcarrier of its " left and right " two with the interference of specific subcarrier.Under the condition of the RC formed filter of application β=0.3, the large logotype of the useful signal on each subcarrier and interference signal as shown in Figure 3.
As shown in Figure 3, when the power of useful signal does not have lossy time, this symbolic point do not exist yet the interference between subcarrier, but when the power loss of useful signal is larger, its interference is also larger, this also just makes the signal-to-jamming ratio on this determination point (SINR) diminish from " positive and negative " two aspects, and namely available signal power diminishes interference power change greatly.And then we know that the error rate of system and the signal-to-jamming ratio of system are closely related, so the error ratio characteristic of GFDM system just can decline due to the effect of these two aspects.The method of the error rate of existing lifting GFDM system is only considered to reduce the interference between subcarrier, and also there is the high shortcoming of complexity based on the pattern of serial interference elimination.
The mode of the present invention's application WFRFT precoding achieves the multiple target combined optimization problem of GFDM system.The proposition of GFDM system is the high out-of-band power problem based on ofdm system on the one hand, the shortcoming of the height power ratio that another aspect ofdm system self faces, and the characteristic of system is not well embodied under two discrete channel condition.This patent utilizes WFRFT exponent number adjustability, makes the GFDM system of WFRFT precoding promote at its error rate of system under doubly selective channel condition of maintenance or under constant condition, effectively reduce its PAPR, and do not affect its out-of-band power inhibition.
As shown in Figure 4, GFDM system operates due to pulse-shaping, no longer orthogonal between subcarrier, and along with the increase of molding parameter, self-interference between the subcarrier produced also increases thereupon, also larger on the impact of error rate of system, under sets forth same pulse-shaping Parameter Conditions in figure, the bit error rate performance of different WFRFT exponent number.Traditional GFDM system (α=0) can be evenly distributed on each subcarrier the self-interference produced because FFT converts, therefore its best performance, along with conversion exponent number increase (by α=0 to α=1) WFRFT systematic function under awgn channel condition worse and worse.
Fig. 5 and Fig. 6 sets forth the performance of GFDM system under two discrete channel of the WFRFT precoding that the BPSK/16QAM with ZF equilibrium modulates, channel model is ITUPED-B channel, comprise 3 Rayleigh fading footpaths, maximum doppler frequency is 33Hz, 2, the delay in 3 footpaths is 10ns and 20ns, and power gain is-3.6dB and-7.2dB.As shown in analogous diagram, along with the increase of order of modulation, the difference between the GFDM error rate of system of different rank WFRFT precoding diminishes gradually, until difference is little.This is caused by 2 reasons, and on the one hand under awgn channel model, GFDM system is best performance when (α=0); On the other hand, under two discrete channel model, due to its distinctive character of WFRFT, at certain exponent number α optabove agree with mutually with channel parameter, the performance similar with α=1 with α=0 can be obtained.
Fig. 7 and Fig. 8 gives the performance of the GFDM system of the WFRFT precoding that the BPSK/16QAM with MMSE equilibrium modulates.Be consistent when the channel parameter in Fig. 7 and ZF equilibrium, under BPSK modulating mode, fractional order α=0.5 performance is more excellent, and due to traditional GFDM system (α=0).Channel model ITUVeh-B channel model in Fig. 8: have 6 Rayleigh fading footpaths, time delay is 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 is 10MHz, and car speed is 120km/h.The system of the 16QAM modulation under this channel model, α=0.5 performance is more excellent, and its performance is better than traditional GFDM system (α=0) equally.
So under doubly selective channel Model Condition, the GFDM system of WFRFT precoding can reach the bit error rate performance similar or more excellent than traditional GFDM system (α=0) on certain exponent number.
Fig. 9 make use of another advantage of WFRFT, namely can the peak-to-average power ratio of regulating system flexibly.In score field (α=0.3 and α=0.5), the PAPR of GFDM system can be effectively reduced.
Comprehensive analysis Fig. 5-9 can obtain, and the GFDM system of WFRFT precoding, promoting or can not effectively reduce while the influential system error rate PAPR of system, achieves the multiobject associating performance boost problem about GFDM system.And then in multiobject implementation procedure, the select permeability of optimized parameter is carried out according to concrete realize target.
System of the present invention is the form of the broad sense of traditional GFDM system, the exponent number adjustability that this system takes full advantage of weighted score Fourier transform has more broadly performance to make GFDM system, good bit error rate performance under comprising lower PAPR and Complex Channel model.
The difference of the present invention and document 4 is to propose a kind of GFDM system of WFRFT precoding and the form of low complex degree thereof, has carried out the analysis of validity to the performance of the error rate under doubly selective channel.
The WFRFT-GFDM system that the present invention proposes is by the flexible adjustment of parameter and select the merging that can be equivalent to three kinds of systems of broad sense more.
The present invention contributes to Mixed Design and the application of waveform under 5G system.

Claims (8)

1., based on the signal transmitting and receiving method of the GFDM system of weighted score Fourier transform, it is characterized in that:
K the subcarrier that described GFDM system comprises, each subcarrier has M subsymbol; K, M are positive integer;
The method comprises the following steps:
Step one, at transmitting terminal, carry out the batch operation of subcarrier exponent number, the data on each subcarrier are carried out to the weighted score Fourier transform on-α rank;
Step 2, different subcarriers is mapped to user;
Step 3, GFDM modulation is carried out to data, that is: the data of input are multiplied with GFDM modulation matrix A, and carry out adding after CP operates and be sent to channel;
Step 4, receiving terminal, after the signal receiving step 3 transmission, go CP to operate to signal, then carry out GFDM demodulation operation, obtain the data after GFDM demodulation;
Data after step 5, the GFDM demodulation that obtains step 4 carry out demapping operation, according to the subcarrier exponent number of transmitting terminal distribute carry out the weighted score Fourier transform corresponding with exponent number after export.
2. the signal transmitting and receiving method of the GFDM system based on weighted score Fourier transform according to claim 1, it is characterized in that in step 2, different subcarriers is mapped and can choose WFRFT parameter according to the demand of user to user and subcarrier length is carried out.
3. the signal transmitting and receiving method of the GFDM system based on weighted score Fourier transform according to claim 1, is characterized in that the receiver of receiving terminal is for coupling receiver, ZF receiver or MMSE receiver.
4., based on the signal transmitting and receiving method of the GFDM system of weighted score Fourier transform, it is characterized in that:
K the subcarrier that described GFDM system comprises, each subcarrier has M subsymbol; K, M are positive integer;
The method comprises the following steps:
Step one, at transmitting terminal, first the data on each subcarrier are all carried out to the weighted score Fourier transform on 1-α rank, by data transformation to frequency domain;
Step 2, at frequency domain, data to be copied, and be arranged in order into the sequence that length is 2M, and utilize RC shaping function to carry out shaping to this sequence;
Step 3, to be superimposed by each subcarrier data, and to be correspondingly added, generating length is the data of K × M;
Step 4, the length obtained step 3 are that the data of K × M carry out IFFT conversion, after be sent to channel;
Step 5, receiving terminal receive the signal that transmitting terminal is launched, and carry out FFT conversion to the data that length is K × M, obtain the signal after conversion;
Step 6, M the data extracted on each subcarrier, and carry out shifting function;
Step 7, utilize RC shaping function to step 6 displacement after data carry out shaping, obtain shaping rear signal;
Step 8, the data on each subcarrier are carried out M point α-1 rank weighted score Fourier transform after export.
5. the signal transmitting and receiving method of the GFDM system based on weighted score Fourier transform according to claim 4, it is characterized in that in step one, the weighted score Fourier transform of carrying out 1-α rank at transmitting terminal transforms to frequency domain signal, and the inverse transformation of corresponding exponent number in step 8.
6. the signal transmitting and receiving method of the GFDM system based on weighted score Fourier transform according to claim 4, it is characterized in that in step 2, after carrying out forming processes, be positioned at middle data to remain unchanged, the distribution in " trapezoidal ", the data of both sides are 0, and the length of described " trapezoidal " is relevant with shaping function parameter beta.
7. the signal transmitting and receiving method of the GFDM system based on weighted score Fourier transform according to claim 4, it is characterized in that in step 3, each subcarrier data is superimposed, and in the corresponding process be added, interference comes from " slope " section that adjacent two subcarriers are arranged in " trapezoidal ", there is not interference between the subcarrier adjacent when β=0.
8. the signal transmitting and receiving method of the GFDM system based on weighted score Fourier transform according to claim 4, it is characterized in that after step 5, if Received signal strength process is fading channel, then carry out area block equalization operation to signal, described area block equalization operation comprises ZF equilibrium and MMSE equilibrium.
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CN106330277A (en) * 2016-08-26 2017-01-11 西安电子科技大学 Correlation rotation precoding method 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
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