CN106358247B - A kind of ofdm communication method and system of non-homogeneous subband superposition - Google Patents
A kind of ofdm communication method and system of non-homogeneous subband superposition Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
- H04W28/20—Negotiating bandwidth
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Abstract
The invention discloses a kind of ofdm communication method and system of non-homogeneous subband superposition, belong to wireless communication field.Transmitting terminal of the invention is divided into multiple subbands according to different application scenarios, entire channel width, and the subcarrier spacing of each subband and time-domain symbol length can be different.Then the code stream of high speed is become the code stream of low speed by sub-band division, signal sampling rate is reduced with this, improves the availability of frequency spectrum；The modulated signal of OFDM is filtered by multiphase multiple filter simultaneously, and then reduces computation complexity.Receiving end, which carries out a series of inversely processings corresponding with transmitting terminal, can be obtained the transmission data of estimation.While the present invention is the advantages of remaining OFDM and F-OFDM, its disadvantage is overcome.The flexible configuration of bandwidth may be implemented in the present invention, realizes the asynchronous transmission of signal.
Description
Technical field
The invention belongs to wireless communication fields, specifically set and are related to a kind of OFDM (Orthogonal of non-homogeneous subband superposition
Frequency Division Multiplexing) communication technology.
Background technique
Mobile communication, by rapid development in more than 30 years, has had become the basis of connection human society since birth
Information network, it not only changes people's lives mode, but also has pushed the development of national economy, improves social informatization
It is horizontal.As forth generation mobile communication system (4G) enters commercial stage, the 5th Generation Mobile Communication System (5G) has become entirely
The hot spot of ball research.The termination capacity of the following 5G communication network is up to several hundred hundred million or more, wearable intelligent terminal, magnanimity Internet of Things
Network termination, car networking terminal and the terminal for supporting D2D (Device-to-Device) communication etc., these will become terminal and connect
The important component connect, so following 5G network is needed with the terminal connection of optimal scheme support magnanimity.5G network is
The large platform of one plurality of application scenes fusion, some application scenarios require ultra high bandwidth, the concern of some application scenarios to arrive in real time
It reaches, some are only that magnanimity small data is applied, some are urgent disaster emergencies.The application scenarios demand for how meeting diversification is
The important topic of 5G research.Under hot spot high capacity scene, high user experience rate and high flux density are realized,
It is the significant challenge that 5G faces.On the whole, the following 5G network needs support higher speed, lower time delay, more industry
Business, the terminal of magnanimity, the higher availability of frequency spectrum, for the requirement more than meeting, waveform of eating dishes without rice or wine in 5G network is designed to
The emphasis of research.
The OFDM technology utilized in forth generation mobile communication system although improving the availability of frequency spectrum, and can be fought
Multipath fading, but its frequency spectrum of ofdm system is that sinc function generates outside biggish band so that transmitting signal attenuation outside a channel is slower
Radiation, in order to reduce the interference between frequency band, needs more protection bands.In LTE standard, 10% bandwidth for reducing
The attenuation outside a channel of OFDM frequency spectrum, causes frequency spectrum resource to waste.In up channel, if side lobe gain is higher, needed between user
Want stringent synchronization.In order to improve the availability of frequency spectrum, reduction attenuation outside a channel can add a filter in an ofdm system,
Here it is filtering OFDM (Filtered-OFDM:F-OFDM) system schemas.Huawei devises a kind of method generation directly filtered
F-OFDM signal, i.e., each subband reduce attenuation outside a channel by the peaceful filter of one Chinese of addition.The filter that this method is used is long
Degree is 1025, so that computation complexity is very high, increases difficulty for hardware realization.
Ofdm system subcarrier spacing is fixed and invariable, and is unable to flexible spectrum deployment resource.The time-frequency of ofdm system provides
After the source method of salary distribution is as follows: subcarrier in frequency domain interval is fixed, and subcarrier spacing determines, the length of time-domain symbol, CP (are followed
Ring prefix) length etc. also just determines that for ofdm system, the following flexible requirement of 5G cannot be accomplished substantially.For example it holds
To the car networking business of end 1ms time delay, it is desirable that in the extremely short time domain period, this just needs the wider subcarrier bandwidth of frequency domain；And object
The multi-connection scene of networking, single-sensor transmission data volume is extremely low, but very high to system integrated connection number requirement, needs in frequency domain
The narrow subcarrier bandwidth of upper configuration, and in the time domain the length of symbol and TTI can long enough, hardly need and examine
Consider inter-symbol interference problem, also there is no need to be re-introduced into CP.
Summary of the invention
Goal of the invention of the invention is: in view of the above problems, providing a kind of OFDM of non-homogeneous subband superposition
Communication means to meet the flexible configuration of resource under different scenes, while improving the availability of frequency spectrum, reduces computation complexity.
A kind of ofdm communication method of non-homogeneous subband superposition of the invention, including the following steps:
Transmitting terminal step:
Entire channel width is divided into K subband, the broadband that each subband is arranged is set as Bi=Δ fiNRBQi, and set
Set the subcarrier number of each subband transmissionWherein Δ fiIndicate the subcarrier spacing of i-th of subband and K son
The subcarrier spacing of band is different, NRBIndicate the number of sub carrier wave (N an of resource blockRBValue depend on used communication protocols
View), QiTo preset integer, sub-band identifier i=1,2 ... K, symbolIt indicates lower to be rounded；
The signal sampling rate that each subband is arranged isWherein NiIndicate the shifting of i-th of subband
The Fourier transformation sampling number of dynamic communication standards, miIt indicates to reduce multiple, by adjusting miValue so that Ni/miWithDifference within a preset range, i.e., make N as far as possiblei/miValue it is closestExisting subband signal sample rate is usually
NiΔ f, the present invention is by reducing subband signal sample rate, so that the order of the filter used reduces, and then reduces meter
Calculate complexity.
The binary bits flow data b of input is modulated to obtain complex signal d, and the subcarrier number based on settingComplex signal d is divided into K subband, obtains the complex signal d of K subbandi, wherein complex signal diSignal sampling
Rate is
Respectively to K complex signal diOFDM modulation (inverse Fourier transform, addition cyclic prefix) is carried out, signal is obtainedWherein the sampling number of inverse Fourier transform is Ni/mi；
F based on i-th of subbandiGrade filter, the sampled value L of every grade of filterj, j=1,2 ..., Fi(wherein), to signalCarry out FiThe processing of rate-matched step by step of grade: since the 1st grade, based on the sampled value L for working as primej
After being up-sampled, then by the filter progress process of convolution of j-th stage, i.e., first to signalAccording to the 1st grade of sampled value L1
After being up-sampled, then pass through the 1st grade of filter；Then sampled value L is based on to the output of the 1st grade of filter2It is up-sampled
Afterwards, then pass through the 2nd grade of filter；And so on, complete rate-matched step by step；The present invention is by rate-matched step by step, so that often
The signal sampling rate of a subband is identical, and sample rate is fs=NiΔfi, i=1,2 ..., K reach and mobile communication standard
In identical sample rate.
In order to further increase treatment effeciency, F is being carried outiWhen the processing of rate-matched step by step of grade, first to i-th subband
Filters at different levels carry out poly phase, obtain j-th stageA subfilter, wherein the length of the subfilter of j-th stage be Indicate the length of the j-th stage filter of i-th of subband；When carrying out j-th stage convolutional filtering, pass through j grades
A sub- filter parallel carries out.
To FiThe signal of grade filter outputFrequency spectrum shift processing is carried out, signal is obtainedBy the letter of K subband
NumberSuperposition obtains transmitting signalAnd emit.
Emit signalChannel transmits to obtain signal
Receiving end step:
Receive signalAnd to signalThe identical frequency spectrum shift processing of transmitting terminal is carried out, the reception signal of each subband is obtainedWherein i=1,2 ... K；
Based on the F with the matched each subband of transmitting terminaliThe sampled value L of grade filter, every grade of filterj, to signalInto
Row FiThe processing of rate-matched step by step of grade, obtains signalFrom FiGrade starts, and the filter for first passing through j-th stage carries out at convolution
Reason, then based on the sampled value L for working as primejCarry out down-sampling, the i.e. inverse rate-matched step by step of realization transmitting terminal；
To signalCyclic prefix, Fourier transformation are removed, frequency-region signal is obtainedThe wherein sampling number of Fourier transformation
For Ni/mi；Again to K frequency-region signalIt carries out serioparallel exchange and obtains signal
To signalDemodulated the binary bits flow data estimated
The present invention is divided into multiple subbands according to different application scenarios, entire channel width, then the code of high speed
Stream becomes the code stream of low speed by sub-band division, reduces signal sampling rate with this, improves the availability of frequency spectrum；And each subband
Subcarrier spacing and time-domain symbol length can be different.Signal is filtered by multiphase multiple filter, and then reduces meter
Calculate complexity.While the present invention is the advantages of remaining OFDM and F-OFDM, its disadvantage is overcome；The spirit of bandwidth may be implemented
Configuration living, realizes the asynchronous transmission of signal.
Corresponding above-mentioned communication means, the invention also discloses a kind of ofdm communication systems of non-homogeneous subband superposition, including
Transmitting terminal, receiving end, wherein transmitting terminal includes bitstream generation unit, signal modulation unit, demultplexer, OFDM modulation list
Member, frequency spectrum shift unit and transmitting unit；Receiving end includes receiving unit, signal demodulation unit, multiplexer, OFDM demodulation list
Member, frequency spectrum shift unit；Meanwhile transmitting terminal, receiving end also further include de-rate matching unit respectively；Wherein de-rate matching unit packet
F group sampling unit and filter are included, the sampled value of sampling unit is Lj, andmiIndicate the reduction times of i-th of subband
Number, and meet Ni/miValue closest to i-th of subband sub-carrier numberNiIndicate mobile communication system standard
Fourier transformation sampling number, by FiGroup sampling unit and filter are defined as 1~FiStage speed coupling subelement；
Transmitting terminal:
Bitstream generation unit obtains plural number through signal modulation cells modulate for generating binary bits flow data b
Signal d；
Complex signal d is divided into K subband by demultplexer, and the complex signal of each subband is di, and i-th of subband
Broadband Bi=Δ fiNRBQi, wherein Δ fiIndicate that the subcarrier spacing of the subcarrier spacing of i-th of subband and K subband is different,
NRBIndicate the number of sub carrier wave of a resource block, QiTo preset integer；The signal sampling rate of i-th of subbandWherein NiIndicate the Fourier transformation sampled point of the mobile communication system standard of i-th of subband
Number, miIt indicates to reduce multiple；
By the road K OFDM modulation unit, parallel to K complex signal diCarry out inverse Fourier transform, addition cyclic prefix
Obtain signalWherein the sampling number of inverse Fourier transform is Ni/mi；
By the road K de-rate matching unit, parallel to K signalCarry out FiThe processing of rate-matched step by step of grade: from the 1st grade
Rate-matched subelement starts, and is first based on sampled value LjCurrent input is up-sampled, then is rolled up by j-th stage filter
Product filters and using convolutional filtering result as the input of rear stage, wherein the 1st grade of input is signal
By FiThe output signal of grade filterAs the input of frequency spectrum shift unit, pass through the road K frequency spectrum shift unit
Complete K signalFrequency spectrum shift processing, obtain signalAnd it is sent to transmitting unit；
Transmitting unit is by the signal of K subbandSuperposition obtains transmitting signalAnd emit.
Emit signalChannel transmits to obtain signal
Receiving end:
Receiving unit is for receiving signalAnd it is sent to frequency spectrum shift unit；
The road K frequency spectrum shift unit is to signalThe identical frequency spectrum shift processing of transmitting terminal is carried out, the road K is obtained and receives signalAnd it is sent to de-rate matching unit, wherein i=1,2 ... K；
By the road K de-rate matching unit, parallel to K signalCarry out FiThe processing of rate-matched step by step of grade, obtains letter
NumberFrom FiStage speed coupling subelement starts, and first passes through j-th stage filter and carries out convolutional filtering, then is based on sampled value LjInto
Row down-sampling, and using down-sampling result as the input of rear stage rate-matched subelement, wherein FiThe input of grade is signal
By signalAs the input of OFDM demodulation unit, K signal is completed by the road K OFDM demodulation unitGo follow
Ring prefix, Fourier transformation obtain the road K frequency-region signalWherein the sampling number of Fourier transformation is Ni/mi；
Multiplexer is used for the road K frequency-region signalMerge into signal all the wayAnd it is sent to signal demodulation unit；
Signal demodulation unit is to signalDemodulated the binary bits flow data estimated
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
1) by reducing the sample rate of each subband signal, so that the order of filter used by reducing, reduces signal
Attenuation outside a channel, improve the availability of frequency spectrum；
2) when being filtered, multiple filter is connected, every level-one filter can reduce by the way of poly phase
Filter order reduces computation complexity；
3) on frequency domain, the settable subcarrier spacing for meeting different system requirements of each subband, it can flexible configuration
Bandwidth meets the needs of different application scene；
4) in the time domain, since whole bandwidth is divided into K subband, each subband is independent from each other, and can be transmitted not
Same signal, reduces requirement of the system to synchronization accuracy.
Detailed description of the invention
Fig. 1 is flow diagram of the invention.
Fig. 2 is the signal power spectral curve of F-OFDM and ofdm system.
Fig. 3 is the resource distribution of (NSS-OFDM system) different application scene of the invention.
Fig. 4 is the performance curve under the different filters of the present invention with ofdm system.
Fig. 5 is the BER curve under three sub-band division different sub-carrier intervals of the invention.
Fig. 6 is the performance curve of different modulating mode difference protection band and ofdm system of the present invention.
Fig. 7 is ofdm system, and the calculating under F-OFDM system and (NSS-OFDM system) different modulating mode of the invention is multiple
Miscellaneous degree D prism map.
Fig. 8 is ofdm system, F-OFDM system and NSS-OFDM system spectrum utilization rate D prism map.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this hair
It is bright to be described in further detail.
Referring to Fig. 1, the ofdm communication system (hereinafter referred to as NSS-OFDM system) of non-homogeneous subband superposition of the invention is main
It to include bitstream generation unit, transmitting unit, signal receiving unit, signal modulation/demodulation unit, sub-band division/integration
Unit, OFDM modulation/OFDM demodulation unit, de-rate matching unit and frequency spectrum shift unit.Detailed process are as follows:
The binary bits flow data b needed for transmitting terminal, bitstream generation unit generation system, by signal modulation,
Such as QPSK, complex signal d is obtained, complex signal d is divided by K subband by demultplexer (DEMUX), each subband
Complex signal is di, i=1,2 ..., K.Protection band is N between subbandFGI, the bandwidth of each subband are as follows: Bi=Δ fiNRBQi,
Middle Δ fi, i=1,2 ..., K are the subcarrier spacing of i-th of subband, and different application scenarios, subcarrier spacing is different, such as Fig. 3
It is shown (different subcarrier spacing and time cycle to be configured according to different application scenarios.For scenes of internet of things, patrilineal line of descent with only one son in each generation
Sensor transmission data volume is extremely low, but very high to system integrated connection number requirement, then subcarrier spacing is relatively narrow, but time-domain symbol length
It is longer；For the application scenarios of car networking and high-speed rail, wider subcarrier spacing is needed, in order to reduce time delay, the time domain of signal
Symbol period is shorter.For traditional ofdm system, the time-domain symbol period of subcarrier spacing and signal be it is fixed, can carry out
The transmission of common sound/data and video；For other application scene, different sons can be set and carried according to different requirements
Wave spacing).NRBFor the number (number of sub carrier wave of resource block in such as LET) of a resource block subcarrier, QiTo preset integer, and
MeetB is the bandwidth of whole system.In K subband, subcarrier spacing is different, and each subband transmits subcarrier
Number are as follows:
According to different application scenarios, set the signal sampling rate of each subband divided toWherein reduce multiple miValue be based onIt is configured, i.e., so that makingValue it is closestFFT and IFFT module is module most basic in ofdm system, and FFT is real
A kind of fast algorithm of existing DFT (discrete fourier variation), IFFT is the inverse transformation of FFT.In the present invention, involved by IFFT, FFT
Sampling number beSubscript i is for identifying different subbands.
By the complex signal d of the i-th subbandiIt inputs OFDM modulation unit (IFFT transformation, add cyclic prefix) and obtains signal
Then again to signalCarry out rate-matched step by step: signalUp-sample then successively with filter 1,2 ...
F convolution.Signal first passes around L1Up-sampling again, through wave filter 1, then signal passes through L2Up-sampling again, through wave filter
2, until passing throughUp-sampling again is through wave filter Fi.WhereinIn order to reduce FiGrade filter order
Number improves transmission rate, the F filter 1,2 ...iIt is respectively divided intoA subfilter, signal and subfilter
Group carries out convolution.
When signal passes through FiAfter grade filter, the signal sampling rate of each subband is identical, sample rate are as follows: fs=NiΔ
fi, i=1,2 ..., K.It is filtered by multiphase subfilter, the signal parallel operation on the road K Ge Zi can greatly improve fortune
Capable speed.
I-th of subband signal passes through 1,2 ... FiGrade filter obtains signalPhase is carried out to this signal
The frequency spectrum shift answered obtains signalK subband signal is superimposed to obtain total transmitting signal are as follows:
Signal after superposition is obtained by channel
In receiving end, receiving unit receives signal for obtainingAnd by frequency spectrum shift unit to reception signalInto
Row frequency spectrum shift corresponding with transmitting terminal, obtains the signal of each subband
In the de-rate matching unit of transmitting terminal, to each subband signalFirst pass through F stage speed coupling subelement: warp
F grades of filters carry out convolutional filtering, then are based on sampled value LFCarry out down-sampling；Pass through F- step by step in the same way again
1 ..., 2,1 stage speed coupling subelements, finally obtain signal
SignalFrequency-region signal is obtained by OFDM demodulation module (going cyclic prefix, FFT transform)
Finally, passing through multiplexer (MUX) for K frequency-region signalIt is complex as signal all the wayIt is carried out through signal demodulation unit
Demapping obtains estimation binary bits flow data
NSS-OFDM system of the invention can be with the parameter of flexible configuration signal according to different scenes, and passes through using more
Phase multiple-stage filtering can reduce computation complexity, improve the availability of frequency spectrum.The present invention is using the number of system operation multiplication as meter
Calculate complexity.In computation complexity, only consider that signal passes through the multiplication number of IFFT and filter.Three kinds are provided separately below
System (ofdm system, F-OFDM system, NSS-OFDM system) is in the computation complexity Γ of transmitting terminal:
Wherein, N is ofdm system and F-OFDM system IFFT/FFT sampling number, and K is the subband that whole bandwidth divides
Number.In F-OFDM system, each sub-filter length is Lf.In NSS-OFDM system, LK,1…,LK,F-1,LK,FTo draw
When dividing K subband, filter 1 arrives the length of filter F, L1…,LF-1,LFFor the value of filter up-sampling, and meet L1×L2
×…×LF-1×LF=mi。NiFor the IFFT/FFT sampling number of the mobile communication system standard of each subband, miTo reduce again
Number.
In LTE standard, the availability of frequency spectrum of ofdm system are as follows:Of the invention
The availability of frequency spectrum of NSS-OFDM system are as follows:Wherein K draws for subband
The number divided, NFGI′For the interval of channel skirt protection band, meet NFGI′=p1Δ f, NFGISpaced, value is protected for intersubband
For NFGI=p2Δ f, Δ f are subcarrier spacing.Wherein p1、p2For systemic presupposition parameter, and p2It can be set to 0.
Embodiment
In emulation, signal is the transmission mode under LTE standard 20MHz bandwidth, and wherein channel width is B=20MHz, son
Intercarrier is divided into Δ f=15KHz, and the sample rate of signal is fs=30.72Mbps does not consider the encoding and decoding of signal.Assuming that entire
Three subbands of bandwidth partition, the subcarrier spacing of each subband are respectively as follows: Δ f1=15KHz, Δ f2=30KHz, Δ f3=
60KHz, then first three height of down-sampling is respectively as follows: N with the sampling number of Fourier transformation1=2048, N2=1024, N3=
512, according to formula subband bandwidth formula Bi=Δ fiNRBQiAvailable three subband signal bandwidth are successively are as follows: B1=15 × 12 ×
Q1=180Q1KHz、B2=30 × 12 × Q2=360Q2KHz、B3=60 × 12 × Q3=720Q3KHz enables Q1=37, Q2=18, Q3
=9, the channel width that three subbands can be obtained is respectively B1=6.66MHz, B2=6.48MHz, B3=6.48MHz.Each subband
The subcarrier number of transmission are as follows:Each subband carries out 4 times of down-sampling, down-sampling
The sampling number of Fourier transformation later is respectively as follows: NFFT1=512, NFFT2=256, NFFT3=128.Remaining channel width
As the protection band N between subbandFGIWith the protection band N at edgeFGI′, other parameter settings are as shown in table 1.
Table 1
The power spectral density plot of Fig. 2 expression ofdm system and F-OFDM (K=1) system.K is that whole bandwidth divides subband
Number, ofdm system edge-protection zones be 1MHz, F-OFDM system whole bandwidth SRRC filter filtering, the length of filter
Degree is Lf=1025, edge-protection zones 30KHz, other parameters are identical with LTE ofdm system parameter.As shown in Figure 2, F-
The attenuation outside a channel of OFDM substantially reduces, and the availability of frequency spectrum significantly improves, but whole bandwidth only allows signal in a scenario
Transmission, and computation complexity is higher.
Fig. 4 indicates NSS-OFDM system in SRRC (square root raised cosine) window filter, hanning (Chinese is peaceful) window filter
With under kasier (Caesar) window filter and the BER performance curve of ofdm system.Whole bandwidth is divided into 3 subbands, every height
The subcarrier spacing of band is respectively as follows: 15KHz, 30KHz, 60KHz, and protection interval is 15KHz, 16QAM modulation between subband.Herein
The BER of NSS-OFDM system is the sum of all subband number of error bits in emulation, and other parameters are as shown in table 1.Emulation display:
The performance of SRRC (square root raised cosine) filter is best, and the performance of hanning (Chinese is peaceful) filter is taken second place, kasier (Caesar)
The performance of filter is worst.So the present invention selects SSRC filter to be filtered NSS-OFDM system, receiving end use
Method with filtering filters signal.
Fig. 5 indicates the BER curve of three subbands under identical conditions.In emulation, the subcarrier spacing point of three subbands
Not are as follows: Δ f1=15KHz, Δ f2=30KHz, Δ f3=60KHz, the protection interval between subband is 30KHz, and each subband is
16QAM modulation, other parameters are as shown in table 1.Since the subcarrier spacing of each subband is different, the interference between subband is not yet
Together, as Δ f3=2 Δ f2=4 Δ f1When, the signal meeting interference by subband 2 and subband 3 simultaneously of subband 1.It is obtained by figure
Out, by the division of different sub-band, orthogonality is no longer met between subband, the BER performance curve of subband 3 is better than subband 1 and son
Band 2.
Fig. 6 indicates under different modulating mode that fixed filters order changes the protection interval between subband, more different
Influence of the protection interval to BER performance.The BER of NSS-OFDM system is the sum of all subband number of error bits in this emulation,
Protection band between subband is respectively set to 0/1/2/3/4 times of minimum subcarrier spacing Δ f1=15KHz, other parameter settings
As shown in table 1.It is obtained by Fig. 6, when system is in low-order-modulated, if QPSK is modulated, filter order used is lower, filter
1 and the order of filter 2 be respectively as follows: 100,80.As order of modulation improves, filter order increases, when modulation system is
When 16QAM, optimal filter order are as follows: 200,100, when modulation system is 64QAM, optimal filter order are as follows: 300,60.
Under different modulation systems, as the protection interval between subband becomes larger, the BER performance of NSS-OFDM system is better.
Fig. 7 indicates ofdm system, the computation complexity Γ of F-OFDM system and NSS-OFDM system.In computation complexity Γ
Calculation formula in, N=2048 is IFFT/FFT sampling number, and whole bandwidth divides 3 subbands, between the subcarrier of three subbands
Every being respectively as follows: Δ f1=15KHz, Δ f2=30KHz, Δ f3=60KHz.The length of F-OFDM system, each sub-filter is
1024.In NSS-OFDM system, L1=L2=2 be the value of filter up-sampling, L3,1,L3,2For the length of filter 1 and filter 2
Degree.When being emulated, the protection interval between subband is 15KHz, and modulation system is respectively QPSK, 16QAM and 64QAM.Choosing
It selects SRRC filter to be filtered, other parameters are as shown in table 1.Show that NSS-OFM system complexity is lower than by above-mentioned parameter
F-OFDM system.
Fig. 8 shows ofdm system, the availability of frequency spectrums of F-OFDM system and NSS-OFDM system.Ofdm system edge difference
There is the protection band of 1MHz, then the availability of frequency spectrum is in 90%, F-OFDM system, and whole bandwidth is divided into 3 subbands, three subbands
Bandwidth be respectively as follows: 0.72MHz, 18MHz, 0.72MHz.The then availability of frequency spectrum are as follows:In NSS-OFDM system, whole bandwidth is divided into 3 subbands, and three
The bandwidth of a subband is respectively as follows: 6.66MHz, 6.48MHz, 6.48MHz, then the availability of frequency spectrum of NSS-OFDM system are as follows:In emulation experiment, the protection interval between subband is 15KHz,
16QAM modulation, the length of SRRC filter are L3,1=200, L3,2=100.It is obtained by Fig. 7 and Fig. 8, NSS-OFDM complexity
Lower than the method that F-OFDM system directly filters, the availability of frequency spectrum is higher than OFDM and F-OFDM system.
By being analyzed above it is found that the present invention can be according to different application scenarios flexible configuration signal parameters, for the next generation
Communication system provides good waveform design method.The availability of frequency spectrum can be improved simultaneously, reduces out-of-band radiation, can solve existing
In spectrum shortage, the problem of transmitting data exponential growth.Relative to the method that F-OFDM is directly filtered, the present invention passes through multiphase
Multiple filter convolution, so that filter length substantially reduces, computation complexity is reduced.
The above description is merely a specific embodiment, any feature disclosed in this specification, except non-specifically
Narration, can be replaced by other alternative features that are equivalent or have similar purpose；Disclosed all features or all sides
Method or in the process the step of, other than mutually exclusive feature and/or step, can be combined in any way.
Claims (4)
1. a kind of ofdm communication method of non-homogeneous subband superposition, characterized in that it comprises the following steps:
Transmitting terminal step:
Entire channel width is divided into K subband, the broadband that each subband is arranged is set as Bi=Δ fiNRBQi, each subband
Subcarrier numberWherein Δ fiIndicate the subcarrier spacing of the subcarrier spacing of i-th of subband and K subband
Difference, NRBIndicate the number of sub carrier wave of a resource block, QiTo preset integer, sub-band identifier i=1,2 ... K；
The signal sampling rate that each subband is arranged isWherein NiIndicate that the movement of i-th of subband is logical
Believe the Fourier transformation sampling number of system standard, miIt indicates to reduce multiple, by adjusting miValue so that Ni/miValue most
Close to the subcarrier number of i-th of subband
The binary bits flow data b of input is modulated to obtain complex signal d, and the subcarrier number based on setting
Complex signal d is divided into K subband, obtains the complex signal d of K subbandi, wherein complex signal diSignal sampling rate be
Respectively to K complex signal diCarry out inverse Fourier transform, addition cyclic prefix obtains signalWherein become against Fourier
The sampling number changed is Ni/mi；
F based on i-th of subbandiGrade filter, the sampled value L of every grade of filterj, j=1,2 ..., Fi, to signalCarry out Fi
The processing of rate-matched step by step of grade: since the 1st grade, based on the sampled value L for working as primejAfter being up-sampled, then pass through j-th stage
Filter carry out process of convolution；Wherein
To FiThe signal of grade filter outputFrequency spectrum shift processing is carried out, signal is obtainedBy the signal of K subband
Superposition obtains transmitting signalAnd emit；
Receiving end step:
Receive signalAnd to signalThe identical frequency spectrum shift processing of transmitting terminal is carried out, the reception signal of each subband is obtained
Wherein signalTo emit signalChannel transmits to obtain, i=1,2 ... K；
Based on the F with the matched each subband of transmitting terminaliThe sampled value L of grade filter, every grade of filterj, to signalCarry out Fi
The processing of rate-matched step by step of grade, obtains signalFrom FiGrade starts, and the filter for first passing through j-th stage carries out process of convolution,
Again based on the sampled value L for working as primejCarry out down-sampling；
To signalCyclic prefix, Fourier transformation are removed, frequency-region signal is obtainedWherein the sampling number of Fourier transformation is Ni/
mi；Again to K frequency-region signalIt carries out serioparallel exchange and obtains signal
To signalDemodulated the binary bits flow data estimated
2. the method as described in claim 1, which is characterized in that carrying out FiWhen the processing of rate-matched step by step of grade, first to i-th
The filters at different levels of a subband carry out poly phase, obtain j-th stageA subfilter, the wherein subfilter of j-th stage
Length is Indicate the length of the j-th stage filter of i-th of subband；
When carrying out j-th stage convolutional filtering, pass through j gradesA sub- filter parallel carries out.
3. a kind of ofdm communication system of non-homogeneous subband superposition, including transmitting terminal, receiving end, wherein transmitting terminal includes bit stream
Generation unit, signal modulation unit, demultplexer, OFDM modulation unit, frequency spectrum shift unit and transmitting unit；Receiving end packet
Include receiving unit, signal demodulation unit, multiplexer, OFDM demodulation unit, frequency spectrum shift unit；It is characterized in that, the transmitting
End, receiving end respectively further comprise de-rate matching unit；Wherein de-rate matching unit includes FiGroup sampling unit and filter, sampling
The sampled value of unit is Lj, andmiIt indicates the reduction multiple of i-th of subband, and meets Ni/miValue closest to i-th
The sub-carrier number of a subband, NiThe Fourier transformation sampling number for indicating mobile communication system standard, by FiGroup sampling unit and filter
Wave device is defined as 1~FiStage speed coupling subelement；
Transmitting terminal:
Bitstream generation unit obtains complex signal through signal modulation cells modulate for generating binary bits flow data b
d；
Complex signal d is divided into K subband by demultplexer, and the complex signal of each subband is di, and the width of i-th of subband
Band Bi=Δ fiNRBQi, wherein Δ fiIndicate that the subcarrier spacing of the subcarrier spacing of i-th of subband and K subband is different, NRBTable
Show the number of sub carrier wave of a resource block, QiTo preset integer；The signal sampling rate of i-th of subbandWherein NiIndicate the Fourier transformation sampled point of the mobile communication system standard of i-th of subband
Number, miIt indicates to reduce multiple；
By the road K OFDM modulation unit, parallel to K complex signal diCarry out inverse Fourier transform, addition cyclic prefix obtains letter
NumberWherein the sampling number of inverse Fourier transform is Ni/mi；
By the road K de-rate matching unit, parallel to K signalCarry out FiThe processing of rate-matched step by step of grade, obtains signalSince the 1st stage speed coupling subelement, it is first based on sampled value LjCurrent input is up-sampled, then passes through j-th stage
Filter carries out convolutional filtering and using convolutional filtering result as the input of rear stage rate-matched subelement, wherein the 1st grade
Input is signal
By signalAs the input of frequency spectrum shift unit, K signal is completed by the road K frequency spectrum shift unitFrequency spectrum
Processing is moved, signal is obtainedAnd it is sent to transmitting unit；
Transmitting unit is by the signal of K subbandSuperposition obtains transmitting signalAnd emit；
Receiving end:
Receiving unit is for receiving signalAnd it is sent to frequency spectrum shift unit, wherein signalTo emit signalChannel passes
It is defeated to obtain；
The road K frequency spectrum shift unit is to signalThe identical frequency spectrum shift processing of transmitting terminal is carried out, the road K is obtained and receives signalAnd
It is sent to de-rate matching unit, wherein i=1,2 ... K；
By the road K de-rate matching unit, parallel to K signalCarry out FiThe processing of rate-matched step by step of grade, obtains signalFrom FiStage speed coupling subelement starts, and first passes through j-th stage filter and carries out convolutional filtering, then is based on sampled value LjIt carries out
Down-sampling, and using down-sampling result as the input of rear stage rate-matched subelement, wherein FiThe input of grade is signal
By output signalAs the input of OFDM demodulation unit, K signal is completed by the road K OFDM demodulation unitGo follow
Ring prefix, Fourier transformation obtain the road K frequency-region signalWherein the sampling number of Fourier transformation is Ni/mi；
Multiplexer is used for the road K frequency-region signalMerge into signal all the wayAnd it is sent to signal demodulation unit；
Signal demodulation unit is to signalDemodulated the binary bits flow data estimated
4. system as claimed in claim 3, feature exist, the filter of the rate-matched subelements at different levels of each subband is multiphase
Filter, i.e., the filter of the j-th stage of i-th subband byThe length of a subfilter, subfilter is It indicates
The length of the filter of j-th stage rate-matched subelement, wherein i=1,2 ..., K, j=1,2 ..., F；
J-th stage rate-matched subelement passes through when carrying out convolutional filteringA sub- filter parallel carries out.
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