CN108462668A - A kind of GFDM signal interferences elimination system of low complex degree - Google Patents

A kind of GFDM signal interferences elimination system of low complex degree Download PDF

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CN108462668A
CN108462668A CN201810645548.XA CN201810645548A CN108462668A CN 108462668 A CN108462668 A CN 108462668A CN 201810645548 A CN201810645548 A CN 201810645548A CN 108462668 A CN108462668 A CN 108462668A
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signal
gfdm
interference
modules
sub
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CN108462668B (en
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何云
申敏
翁明江
郑焕平
吴广富
陈吕洋
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Chongqing University of Post and Telecommunications
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Chongqing University of Post and Telecommunications
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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
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation

Abstract

The present invention relates to a kind of GFDM signal interferences of low complex degree to eliminate system, belongs to mobile terminal baseband technical field.The system includes transmitting terminal 64QAM mapping blocks and GFDM signal generator modules；Receiving terminal GFDM balance modules, 64QAM De-mapping modules I and ICI interference cancellation modules.The signal of transmitting terminal is mapped by 64QAM, and GFDM is become multiple block of sub-carriers, carries out DFT transform and filtering, frequency domain mapping is then carried out, time domain is transformed to finally by IDFT.Receiving terminal carries out frequency domain equalization using ZF algorithms, generating source by 64QAM demappings signal as interference signal, it is input to single iteration interference cancellation module, the signal for the interference that has been eliminated carries out second of equilibrium finally by the inversion process of failing edge filtering matrix.The present invention can eliminate the interference of GFDM signals with lower computational complexity.

Description

A kind of GFDM signal interferences elimination system of low complex degree
Technical field
The invention belongs to mobile terminal baseband technical field, being related to a kind of single iteration interference cancellation techniques reduces GFDM's The system of ICI.
Background technology
OFDM always one preferred techniques of wireless system over more years.However, it is limited with some：Outside band larger first Radiation (OOB) limits the utilization rate that non-continuous spectrum polymerize as carrier wave；Secondly, highly sensitive to synchronous error, especially to carrying Wave frequency (CFO) partially is sensitive.Compared to OFDM, GFDM has lower OOB, and clock synchronization is partially and frequency deviation is insensitive, and can be more effectively Utilize frequency spectrum fragment.Waveform as 5G networks is candidate, and the urgent logical of low latency may be implemented in the structure based on block of GFDM Letter transmission, the GFDM demodulating processes based on Gabor transformation structure can realize fast demodulation to avoid matrix inversion with this.
The processing of GFDM transceivers can indicate the single multiplication of a complex valued matrices with qam symbol vector.The present invention with In M (N) point discrete Fourier based on leaf transformation (DFT), is demodulated, can be obtained using force zero (Zero Forcing, ZF) algorithm Obtain the operation of low complex degree.
First, the iteration type method such as traditional bilateral successive interference cancellation (DSIC) method needs to consider to calculate complicated Property, single iteration interference low complex degree demodulated signal method proposed by the present invention is suitable for hardware realization.Secondly, the present invention proposes Method it can be considered that number of repetition L be 2 in the case of, other subcarriers interference only with the passband Γ of filter(r)Have Close, and with stopband Γ(f)It is unrelated, so as to reduce the complexity of distracter reconstructed module.
Invention content
It is done in view of this, reducing GFDM intercarriers the purpose of the present invention is to provide a kind of single iteration interference cancellation techniques The system for disturbing (ICI) for eliminating ICI interference, while reducing computational complexity.
In order to achieve the above objectives, the present invention provides the following technical solutions：
A kind of GFDM signal interferences elimination system of low complex degree, is made of transmitting terminal and receiving terminal；The transmitting terminal packet Include 64QAM mapping blocks and GFDM signal generator modules；The receiving terminal includes GFDM balance modules, 64QAM De-mapping modules I and ICI interference cancellation modules；
The signal of transmitting terminal first passes through 64QAM mappings, and in GFDM signal generator modules, GFDM is become multiple subcarriers Block, each block of sub-carriers carry out DFT transform and filtering, then carry out frequency domain mapping, time domain is transformed to finally by IDFT；It receives The GFDM balance modules at end carry out frequency domain equalization using ZF algorithms, first pass around 64QAM demapping signals as interference signal Generating source, then ICI interference cancellation modules are input to, the signal for the interference that has been eliminated, finally by failing edge filtering matrix Inversion process carries out second of equilibrium.
Further, the GFDM signal generator modules include serial to parallel conversion unit, sub-block DFT transform unit, sub-block mistake Sampling unit, sub-block filter unit, frequency domain map unit and IDFT converter units；
The sub-block over-sampling unit：The over-sampling operation for executing L=2, i.e., copy as two pieces of sub-blocks by one piece of sub-block；
The sub-block filter unit：The root raised cosine that rolloff-factor is 0.28 is executed to filter；
The frequency domain map unit：Each sub-block is copied into two neighboring frequency domain by the way of cycle, executes matrix It is mapped for the frequency domain of P；
The IDFT converter units：The data of entire frequency band are transformed into time domain.
Further, the GFDM balance modules：1) ZF algorithms are used, the DFT operations of whole bandwidth is first carried out, time domain is believed Frequency domain number is transformed to, then is carried out by modulation matrix A balanced；2) data of each sub-block of the signal after equilibrium pass through IDFT tune System is transformed to time-domain signal.
Further, the ZF algorithms frequency domain equalizer is：
BZF=(HA)-1
Wherein, H indicates frequency response matrix；Modulation matrix A is expressed as：K indicates subcarrier rope Draw, K indicates subcarrier number, P(k)For the allocation matrix of k-th of subcarrier, Γ(L)The electric-wave filter matrix for being L for number of repetition, R(L)Indicate that number of repetition is the repetition matrix of L.
Further, the ICI interference cancellation modules eliminate function for realizing interference, including interfere generation module, do Disturb cancellation module, secondary balance module, IDFT conversion modules and 64QAM De-mapping modules II；
The interference generation module：The interference on each subcarrier is generated, using formulaK=1 ..., K, wherein Γ(f)For the failing edge part of ptototype filter, WMFor the DFT matrixes of sub-block M points,For the change Jing Guo QAM demappings Change to time-domain signal；
The interference cancellation module：Signal will be received and subtract the interference signal on former and later two subcarriers, using formulaWherein y' is the time-domain signal after interference is eliminated, and y is shown as time-domain received signal and removes the portions CP Point,The interference signal being expressed as on former and later two subcarriers of subcarrier k；Indicate N point IDFT squares Battle array；
The secondary balance module：Using formulaIt is balanced for being carried out to result, using filtering Device failing edge coefficient matrix is inverted；Wherein WNIndicate N point DFT matrixes.
The data of entire frequency domain are transformed into time domain by the IDFT conversion modules.
Further, the 64QAM De-mapping modules I and II are used to realize 64QAM demapping functions.
The beneficial effects of the present invention are：The present invention is calculated based on leaf transformation (DFT) in M (N) point discrete Fourier using ZF Method is demodulated, and the operation of low complex degree is obtained, while eliminating ICI interference.
Description of the drawings
In order to keep the purpose of the present invention, technical solution and advantageous effect clearer, the present invention provides following attached drawing and carries out Explanation：
Fig. 1 is system block diagram of the present invention；
Fig. 2 is GFDM signal generator modules schematic diagram of the present invention；
Fig. 3 is GFDM balance modules schematic diagram of the present invention；
Fig. 4 is ICI interference cancellation modules schematic diagram of the present invention.
Fig. 5 is the systematic bits bit error rate comparison diagram using different schemes.
Specific implementation mode
Below in conjunction with attached drawing, the preferred embodiment of the present invention is described in detail.
As shown in Figure 1, a kind of GFDM signal interferences of low complex degree provided by the invention eliminate system, by transmitting terminal and connect Receiving end forms；Transmitting terminal includes 64QAM mapping blocks and GFDM signal generator modules；Receiving terminal include GFDM balance modules, 64QAM De-mapping modules I and ICI interference cancellation modules.
As shown in Fig. 2, GFDM signal generator modules include serial to parallel conversion unit, sub-block DFT transform unit, sub-block over-sampling Unit, sub-block filter unit, frequency domain map unit and IDFT converter units.
As shown in figure 3, GFDM balance modules：1) ZF algorithms are used, the DFT operations of whole bandwidth is first carried out, time domain is believed Frequency domain number is transformed to, then is carried out by modulation matrix A balanced；2) data of each sub-block of the signal after equilibrium pass through IDFT tune System is transformed to time-domain signal.
As shown in figure 4, ICI interference cancellation modules eliminate function for realizing interference, including interference generation module, interference disappear Except module, secondary balance module, IDFT conversion modules and 64QAM De-mapping modules II.
System is eliminated below for a kind of GFDM signal interferences of low complex degree, detailed GFDM signal interferences is carried out and eliminates Method describes：
One, GFDM signal models
Wherein,G [n] indicates the impulse response of ptototype filter, wherein k indicates that son carries Wave indexes, and K indicates subcarrier number, dk[n] indicates k-th of sub-carrier signal, dk,mIndicate k-th of subcarrier, m-th of symbol letter Number, δ [n-mK] indicate that the mK sample point, n indicate time domain coordinate, m expression symbolic numbers.
Being converted to matrix form by serial to parallel conversion is：
Wherein,Indicate N point IDFT matrixes, P(k)For the allocation matrix of k-th of subcarrier,It is L for number of repetition Electric-wave filter matrix, R(L)Indicate that number of repetition is the repetition matrix of L, WMIndicate sub-block M point DFT matrixes, dkIndicate k-th of son Carrier signal.
Two, modulation step
1, k-th of sub-carrier signal dkM × M DFT transform be WM={ wI, j}M×M, whereinM is indicated DFT counts, Domain Index and frequency domain index when i, j are indicated respectively.
2, the over-sampling repeated by L times, matrix are expressed as R(L)=(IM IM ...)T, wherein IMIt indicates (M*M) Unit matrix, ()TIndicate complex conjugate transposition.
3, frequency domain filtering is carried out, ptototype filter matrix isIts diagonal entry is filter Coefficient, L indicate to repeat the number of repetition of matrix.
4, frequency domain mapping is carried out, matrix expression is：
Wherein, U=LM/2, U (K-1)=LM/2* (K-1), 0U, U (k-1)Indicate that size is the null matrix of (U × U (K-1)), IUIndicate that size is the unit matrix of (U × U).
5, multiple sub-carrier signal summations are carried out.
6, it usesFrequency-region signal is transformed into time domain.
Three, demodulation step
1, it is expressed as by the A/D reception signals converted
Wherein, HlFor frequency domain shock response, XlTo send the frequency domain components of signal, VlFor the noise of first of symbol, ynTable Show that the time-domain signal after serial to parallel conversion, N indicate bandwidth, Domain Index when n is indicated.
2, ZF algorithms frequency domain equalizer is
BZF=(HA)-1
Wherein, modulation matrix is expressed asH indicates frequency response matrix；
3, the signal after ZF equilibriums is yk, the signal by QAM demappings transforms to time-domain signal and is
Four, interference is eliminated
1, interference signal is：
Wherein, Γ(f)For the failing edge part of ptototype filter, WMFor the DFT matrixes of sub-block M points.
2, it receives time-domain signal and subtracts the interference that former and later two subcarriers are brought, expression formula is：
Wherein, y is to receive signal to remove signal after CP.
3, each sub-carrier signal carries out equilibrium and is：
Signal is returned to time domain by the IDFT for 4, carrying out M points again.
5, solution 64QAM mappings.
Embodiment：
1) original signal is mapped by 64QAM；
2) signal passes through serial to parallel conversion, forms block of sub-carriers, wherein M=14, K=14；
3) DFT modulation is carried out in each block of sub-carriers；
4) pass through the over-sampling of L=2；
5) each block of sub-carriers carries out the root raised cosine filtering that rolloff-factor is 0.28；
6) each subcarrier carries out frequency domain mapping；
7) IDFT transformation is carried out to whole bandwidth, transforms to time domain；
8) pass through air traffic channel, channel Vehicular-A, vehicle-mounted rate is 130km/h；
9) DFT is carried out to received signal, transforms to frequency domain；
10) modulation matrix A is utilized, frequency domain equalization is carried out；
11) 64QAM demappings are carried out to signal, obtains signal
12) interference signal is obtained
13) interference signal that the original signal of reception is subtracted to front and back subcarrier obtains clean signal y'；
14) filtering matrix of failing edge is inverted, carries out second of equilibrium, update obtains the demodulation letter of each subcarrier Number；
15) by the signal 64QAM demappings of step 14), update obtains signal
By experiment simulation, Fig. 5 describes the systematic bits bit error rate of different schemes, as shown in figure 5, " OFDM " expression is adopted With the performance of ofdm system；" GFDM ICI " indicate used the present invention claims interference elimination method；" GFDM no ICI " table Show the performance for not carrying out interference elimination；" GFDM ideals FIR " is indicated using the performance of ideal filter and of the present invention The attainable UPS upper performance score of method.The result shows that inter-carrier interference has significant impact to system performance, " GFDM ICI's " This curve ratio " GFDM no ICI " has better performance, and the performance of " GFDM ICI " is close to " GFDM ideals FIR ".
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be Various changes are made to it in form and in details, without departing from claims of the present invention limited range.

Claims (6)

1. a kind of GFDM signal interferences of low complex degree eliminate system, it is characterised in that：The system is by transmitting terminal and receiving terminal group At；The transmitting terminal includes 64QAM mapping blocks and GFDM signal generator modules；The receiving terminal include GFDM balance modules, 64QAM De-mapping modules I and subchannel interfere (inter channel interference, ICI) cancellation module；
The signal of transmitting terminal first passes through 64QAM mappings, and in GFDM signal generator modules, GFDM is become multiple block of sub-carriers, Each block of sub-carriers carries out DFT transform and filtering, then carries out frequency domain mapping, time domain is transformed to finally by IDFT；Receiving terminal GFDM balance modules using ZF algorithms carry out frequency domain equalization, first pass around production of the 64QAM demappings signal as interference signal Source of students, then ICI interference cancellation modules are input to, the signal for the interference that has been eliminated, finally by asking for failing edge filtering matrix Inverse process carries out second of equilibrium.
2. a kind of GFDM signal interferences of low complex degree according to claim 1 eliminate system, it is characterised in that：Described GFDM signal generator modules include serial to parallel conversion unit, sub-block DFT transform unit, sub-block over-sampling unit, sub-block filter unit, Frequency domain map unit and IDFT converter units；
The sub-block over-sampling unit：It executes the over-sampling that number of repetition L is 2 to operate, i.e., one piece of sub-block is copied as into two pieces of sons Block；
The sub-block filter unit：The root raised cosine that rolloff-factor is 0.28 is executed to filter；
The frequency domain map unit：Each sub-block is copied into two neighboring frequency domain by the way of cycle, it is P's to execute matrix Frequency domain maps；
The IDFT converter units：The data of entire frequency band are transformed into time domain.
3. a kind of GFDM signal interferences of low complex degree according to claim 1 eliminate system, it is characterised in that：It is described GFDM balance modules：1) force zero (Zero Forcing, ZF) algorithm is used, the DFT operations of whole bandwidth is first carried out, time domain is believed Frequency domain number is transformed to, then is carried out by modulation matrix A balanced；2) data of each sub-block of the signal after equilibrium are modulated by IDFT It is transformed to time-domain signal.
4. a kind of GFDM signal interferences of low complex degree according to claim 3 eliminate system, it is characterised in that：
The ZF algorithms frequency domain equalizer is：
BZF=(HA)-1
Wherein, H indicates frequency response matrix；Modulation matrix A is expressed as：K indicates sub-carrier indices, K tables Show subcarrier number, P(k)For the allocation matrix of k-th of subcarrier, Γ(L)The electric-wave filter matrix for being L for number of repetition, R(L)It indicates Number of repetition is the repetition matrix of L.
5. a kind of GFDM signal interferences of low complex degree according to claim 1 eliminate system, it is characterised in that：Described ICI cancellation modules for realizing interference eliminate function, including interference generation module, interference cancellation module, secondary balance module, IDFT conversion modules and 64QAM De-mapping modules II；
The interference generation module：The interference on each subcarrier is generated, using formulaIts Middle Γ(f)For the failing edge part of ptototype filter, WMFor the DFT matrixes of sub-block M points,For transforming to by QAM demappings Time-domain signal；
The interference cancellation module：Signal will be received and subtract the interference signal on former and later two subcarriers, using formulaWherein y' is the time-domain signal after interference is eliminated, and y is expressed as time-domain received signal removal CP Signal afterwards,It indicates to receive the interference signal on former and later two subcarriers of signal respectively,Indicate N points IDFT matrixes；
The secondary balance module：Using formulaIt is balanced for being carried out to result；Declined using filter It inverts along coefficient matrix；Wherein WNIndicate N point DFT matrixes；
The data of entire frequency domain are transformed into time domain by the IDFT conversion modules.
6. a kind of GFDM signal interferences of low complex degree according to claim 5 eliminate system, it is characterised in that：It is described 64QAM De-mapping modules I and II are used to realize 64QAM demapping functions.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016050870A1 (en) * 2014-09-30 2016-04-07 The Provost, Fellows, Foundation Scholars, & The Other Members Of Board, Of The College Of The Holy & Undiv. Trinity Of Queen Elizabeth Near Dublin A generalized frequency division multiplexing transceiver
CN107426121A (en) * 2017-08-04 2017-12-01 南京仄普托信息科技有限公司 Training sequence design and application process and device for broad sense Frequency Division Multiplexing system
KR20170134864A (en) * 2016-05-27 2017-12-07 한국과학기술원 Optimal waveform design method for generalized frequency division multiplexing systems
CN107968760A (en) * 2017-10-09 2018-04-27 华南理工大学 Filter a kind of receiving algorithm based on iterative channel estimation in multitone modulating system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016050870A1 (en) * 2014-09-30 2016-04-07 The Provost, Fellows, Foundation Scholars, & The Other Members Of Board, Of The College Of The Holy & Undiv. Trinity Of Queen Elizabeth Near Dublin A generalized frequency division multiplexing transceiver
KR20170134864A (en) * 2016-05-27 2017-12-07 한국과학기술원 Optimal waveform design method for generalized frequency division multiplexing systems
CN107426121A (en) * 2017-08-04 2017-12-01 南京仄普托信息科技有限公司 Training sequence design and application process and device for broad sense Frequency Division Multiplexing system
CN107968760A (en) * 2017-10-09 2018-04-27 华南理工大学 Filter a kind of receiving algorithm based on iterative channel estimation in multitone modulating system

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