CN106357582A - In-band and out-band interference suppression signal modulation and demodulation method based on subcarrier cluster independent filtering - Google Patents
In-band and out-band interference suppression signal modulation and demodulation method based on subcarrier cluster independent filtering Download PDFInfo
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- CN106357582A CN106357582A CN201610955251.4A CN201610955251A CN106357582A CN 106357582 A CN106357582 A CN 106357582A CN 201610955251 A CN201610955251 A CN 201610955251A CN 106357582 A CN106357582 A CN 106357582A
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- 238000001914 filtration Methods 0.000 title abstract description 8
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- 230000008569 process Effects 0.000 claims abstract description 9
- 239000000969 carrier Substances 0.000 claims description 14
- 230000009466 transformation Effects 0.000 claims description 3
- 238000013507 mapping Methods 0.000 abstract description 4
- 238000004891 communication Methods 0.000 description 6
- 238000004088 simulation Methods 0.000 description 6
- 125000004122 cyclic group Chemical group 0.000 description 5
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- 238000006062 fragmentation reaction Methods 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/264—Pulse-shaped multi-carrier, i.e. not using rectangular window
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03343—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/345—Modifications of the signal space to allow the transmission of additional information
- H04L27/3461—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel
- H04L27/3483—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel using a modulation of the constellation points
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Abstract
The invention discloses a modulation and demodulation method of an in-band and out-band interference suppression signal based on independent filtering of subcarrier clusters, which comprises the steps of firstly carrying out constellation point mapping on a coded signal to be transmitted when a multicarrier signal is transmitted in the modulation process, and then distributing discontinuous subcarrier clusters after the constellation point mapping; then, uniformly modulating the continuous subcarrier clusters and the distributed discontinuous subcarrier clusters, finally, respectively filtering each continuous subcarrier cluster, respectively adjusting the power and the phase of each continuous subcarrier cluster, and sending modulated discontinuous subcarrier cluster signals and adjusted continuous subcarrier cluster signals; in the demodulation process, filtering is respectively carried out on each continuous subcarrier cluster; the method filters each subcarrier cluster respectively, modulates and demodulates respectively, and then compensates the uneven subcarrier power in the non-flat passband cluster caused by the impulse response of the short-transmission FIR filter by pre-repeating the continuous subcarrier cluster, so that each subcarrier cluster has almost no interference, and the interference of other signal sources coexisting inside and outside the band is inhibited.
Description
Technical field
The invention belongs to the communications field, particularly to a kind of band internal and external interference suppression letter independently being filtered based on cluster of subcarriers
Number modulation and demodulation method.
Background technology
With the development of wireless communication technology, future broadband wireless communication systems (such as 5g) need higher spectral flexibility,
As harmonious coexistence between heterogeneous system, what all kinds serviced coexists, and this is required for making full use of the rare of fragmentation further
Frequency spectrum resource；Spectrum utilization concentrate on multiple independent and can dynamic recognition time frequency unit, eliminate nonessential time frequency unit
Outer interference signal transmitting.
The broadband trend of wireless communication system, and the fast development of wireless communication technology and business, based on subcarrier
The band internal and external interference Restrain measurement that cluster independently filters is widely used in wireless communication field.
Existing scheme has an OFDM (cp-ofdm) of conventional belt Cyclic Prefix, filter bank multi-carrier (fbmc),
Multi-carrier modulation (gfdm, wcp-coqam) based on cyclic convolution.And these schemes have some shortcomings, followed using conventional belt
During OFDM (cp-ofdm) scheme of ring prefix, band internal and external interference leakage is extremely serious, can be entered by way of adding window
Row improves but extremely limited；Using filter bank multi-carrier (fbmc) scheme although individually being filtered by each carrier wave, up to
Suppress to the internal and external interference of preferable band, strong jamming suppression can cause very long trailing in front and back, reduces time domain motility；Using base
In multi-carrier modulation (gfdm, the wcp-coqam) scheme of cyclic convolution, it is not suitable for the asynchronous access of multi-user's frequency domain, inapplicable
In fading channel (as car networking).
Content of the invention
The invention provides a kind of suppress signal modulation and demodulation side based on the band internal and external interference that cluster of subcarriers independently filters
Method, its objective is to make fragmentation frequency spectrum preferably be utilized, and frequency domain band inside/outside interference rejection capability is more preferable, and when keeping
The compactedness of domain signal, it is to avoid the long streaking before and after signal.
A kind of band internal and external interference suppression signal modulating method independently being filtered based on cluster of subcarriers, is sent in multi-carrier signal
When, first constellation point is carried out to encoded signal to be sent, then to the discontinuous subcarrier after constellation point
Cluster is allocated；Then, then to the discontinuous cluster of subcarriers after continuous subcarrier cluster and distribution carry out uniform modulation, finally, right
After each continuous subcarrier cluster is filtered respectively, more respectively power and phase adjustment are carried out to continuous subcarrier cluster, after modulating
Discontinuous cluster of subcarriers signal and adjustment after continuous subcarrier cluster signal be transmitted.
Encoded signal to be sent is carried out after constellation point, the total sub-carrier number n after mapping is divided into g successively
Group, n=g × n, n are every group of subcarrier sub-carriers sum；For every group of subcarrier, be divided into continuous subcarrier cluster m1 ... mn and
Discontinuous cluster of subcarriers p1 ... pn；Again discontinuous cluster of subcarriers p1 ... pn is allocated.
By formula preemphasis process carried out to filtered each continuous subcarrier cluster:
Wherein, υm,nRepresent the mid frequency of cluster of subcarriers m sub-carriers n, ωmRepresent cluster of subcarriers m sub-carriers number band
The mid frequency of wide k (m)；Represent that sub-carrier cluster m sub-carriers n carry out the modulation constellation after preemphasis, s (υm,n)
Represent the current modulation constellation of cluster of subcarriers m sub-carriers n, fk(m)Represent to fkT () carries out the frequency domain sound that Fourier transformation obtains
Should, fkT () represents that corresponding passband width configures the low pass filter time domain response of m.
A kind of band internal and external interference suppression signal demodulating method independently being filtered based on cluster of subcarriers, is receiving multicarrier letter
After number, first, each continuous subcarrier cluster is filtered respectively, then filtered all cluster of subcarriers is demodulated,
Afterwards constellation point demapping is carried out to the signal after demodulation；
The wave filter being used when each continuous subcarrier cluster is filtered respectively is band filter, each bandpass filtering
Center frequency point υ of devicem,nLow pass cluster wave filter for each continuous subcarrier cluster to be filtered responds fkThe frequency domain midpoint of (t)；
The response of each band filter corresponding low pass cluster wave filter is the passband width of foundation continuous subcarrier cluster from pre-
Table look-up in the low pass cluster wave filter response table of the different cluster bandwidth first storing acquisition.
Each cluster of subcarriers independently carries out fir and filters to suppress other that the interference of node transmission signal coexists, more existing
Scheme is it is also proposed that excessively similar method, but not every interference can remove in filtering, and some schemes will be with frequently
Signal, as noise processed, can reduce the capacity of whole system；Some schemes carry out suppression interference in frequency domain, and practical operation is got up
Difficult to realize.
This scheme has carried out some optimizations, adds a preemphasis scheme, power is compensated, can preferably suppress
Band internal and external interference.Signal after preemphasis is expressed asSignal after modulation is expressed as l
(υm,n)1...l(υm,n)n, according to the signal after modulation, adaptively change each branching filter coefficient of fir wave filter, corresponding
Respective filter responds.
Processed in the cluster being formed due to the non-flat forms passband that the response of short transmission fir filter impulse causes by preemphasis
Sub-carrier power is uneven to be compensated.
Beneficial effect
The invention provides a kind of suppress signal modulation and demodulation side based on the band internal and external interference that cluster of subcarriers independently filters
Method, in modulated process, when multi-carrier signal sends, carries out constellation point to encoded signal to be sent first, then
Discontinuous cluster of subcarriers after constellation point is allocated；Then, then to non-after continuous subcarrier cluster and distribution
Continuous subcarrier cluster is modulated, finally, after each continuous subcarrier cluster is filtered respectively, then to continuous subcarrier cluster respectively
Carry out power and phase adjustment, the discontinuous cluster of subcarriers signal after modulation and the continuous subcarrier cluster signal after adjustment are carried out
Send；In demodulating process, each continuous subcarrier cluster is filtered respectively；The method filters each cluster of subcarriers respectively, respectively
Modulation and demodulation, then by preemphasis continuous subcarrier cluster can compensate for short transmission fir filter impulse response cause non-flat
In smooth passband cluster, sub-carrier power is uneven, makes almost noiseless between each cluster of subcarriers, other signals coexisting inside and outside suppression band
The interference in source.
Brief description
Fig. 1 is modulator approach process schematic of the present invention；
Fig. 2 is demodulation method process schematic of the present invention；
Fig. 3 is that application the method for the invention carries out signal modulation reconciliation timing, and simulation result figure is revealed in band internal and external interference；
Fig. 4 is that application the method for the invention carries out signal modulation reconciliation timing, interference simulation result figure between async user.
Specific embodiment
Below in conjunction with drawings and Examples, the present invention is described further.
As shown in figure 1, a kind of suppress signal modulating method based on the band internal and external interference that cluster of subcarriers independently filters, in overloading
When ripple signal sends, first constellation point is carried out to encoded signal to be sent, then to non-after constellation point
Continuous subcarrier cluster is allocated；Then, then to the discontinuous cluster of subcarriers after continuous subcarrier cluster and distribution it is modulated,
Afterwards, after each continuous subcarrier cluster being filtered respectively, more respectively power and phase adjustment are carried out to continuous subcarrier cluster, will adjust
Discontinuous cluster of subcarriers signal after system and the continuous subcarrier cluster signal after adjustment are transmitted.
Encoded signal to be sent is carried out after constellation point, the total sub-carrier number n after mapping is divided into g successively
Group, n=g × n, n are every group of subcarrier sub-carriers sum；For every group of subcarrier, be divided into continuous subcarrier cluster m1 ... mn and
Discontinuous cluster of subcarriers p1 ... pn；Again discontinuous cluster of subcarriers p1 ... pn is allocated.
By formula preemphasis process carried out to filtered each continuous subcarrier cluster:
Wherein, υm,nRepresent the mid frequency of cluster of subcarriers m sub-carriers n, ωmRepresent cluster of subcarriers m sub-carriers number band
The mid frequency of wide k (m)；Represent that sub-carrier cluster m sub-carriers n carry out the modulation constellation after preemphasis, s (υm,n)
Represent the current modulation constellation of cluster of subcarriers m sub-carriers n, fk(m)Represent to fkT () carries out the frequency domain sound that Fourier transformation obtains
Should, fkT () represents that corresponding passband width configures the low pass filter time domain response of m.
As shown in Fig. 2 a kind of suppress signal demodulating method based on the band internal and external interference that cluster of subcarriers independently filters, receiving
To after multi-carrier signal, first, each continuous subcarrier cluster is filtered respectively, then filtered all cluster of subcarriers is entered
Row demodulation, finally carries out constellation point demapping to the signal after demodulation；
The wave filter being used when each continuous subcarrier cluster is filtered respectively is band filter, each bandpass filtering
Center frequency point υ of devicem,nLow pass cluster wave filter for each continuous subcarrier cluster to be filtered responds fkThe frequency domain midpoint of (t)；
The response of each band filter corresponding low pass cluster wave filter is the passband width of foundation continuous subcarrier cluster from pre-
Table look-up in the low pass cluster wave filter response table of the different cluster bandwidth first storing acquisition.
Each cluster of subcarriers independently carries out fir and filters to suppress other that the interference of node transmission signal coexists, more existing
Scheme is it is also proposed that excessively similar method, but not every interference can remove in filtering, and some schemes will be with frequently
Signal, as noise processed, can reduce the capacity of whole system；Some schemes carry out suppression interference in frequency domain, and practical operation is got up
Difficult to realize.
The method of the invention has carried out some optimizations, adds a preemphasis scheme, power is compensated, can be more
Good suppression band internal and external interference.Signal after preemphasis is expressed asSignal after modulation is expressed as
l(υm,n)1...l(υm,n)n, according to the signal after modulation, adaptively change each branching filter coefficient of fir wave filter, right
Respective filter is answered to respond.
Application the method for the invention carries out signal modulation and conciliates timing, some parameters is emulated, simulation object
Parameter is as shown in table 1.
Table 1 simulation object parameter
| Parameter | Filter each csc using ofdm | Filter each csc using fbmc |
| Fft length | 128 | 128 |
| Guard interval length | 16 | n/a |
| Signal transmitting every time | 4 | 4 |
| Master mould Filter length | n/a | 1symbol |
| Csb Filter length | 65 | 65 |
| Total time | 65-1+16*4=128 (20%) | 128/2+64-1=128 (20%) |
Reveal simulation result with internal and external interference as shown in figure 3, ofdm the and fbmc signal through cluster of subcarriers filtering is all opened up
Outstanding out-of-band interference suppression (up to -80db) is shown, better than cyclic convolution fbmc signal.
Interference simulation result between async user reached for 1/10th symbol weeks as shown in figure 4, time domain is asynchronous when between user
More than the phase, for the user of cyclic convolution between asynchronous interference suddenly increase, but based on cluster of subcarriers filtering ofdm and fbmc
The inter-user interference of signal is steadily kept low, less than -55db.
Specific embodiment described herein is only explanation for example to present invention spirit.The affiliated technology of the present invention is led
The technical staff in domain can be made various modifications or supplement or replaced using similar mode to described specific embodiment
Generation, but the spirit without departing from the present invention or surmount scope defined in appended claims.
Claims (3)
1. a kind of band internal and external interference independently being filtered based on cluster of subcarriers suppresses signal modulating method it is characterised in that in overloading
When ripple signal sends, first constellation point is carried out to encoded signal to be sent, then to non-after constellation point
Continuous subcarrier cluster is allocated；Then, then to the discontinuous cluster of subcarriers after continuous subcarrier cluster and distribution it is modulated,
Afterwards, after each continuous subcarrier cluster being filtered respectively, more respectively power and phase adjustment are carried out to continuous subcarrier cluster, will adjust
Discontinuous cluster of subcarriers signal after system and the continuous subcarrier cluster signal after adjustment are transmitted.
2. method according to claim 1 it is characterised in that carried out pre- to filtered each continuous subcarrier cluster by formula
Increase to process:
Wherein, υm,nRepresent the mid frequency of cluster of subcarriers m sub-carriers n, ωmRepresent cluster of subcarriers m sub-carriers number bandwidth k
The mid frequency of (m)；Represent that sub-carrier cluster m sub-carriers n carry out the modulation constellation after preemphasis, s (υm,n) represent
The current modulation constellation of cluster of subcarriers m sub-carriers n, fk(m)Represent to fkT () carries out the frequency domain response that Fourier transformation obtains, fk
T () represents that corresponding passband width configures the low pass filter time domain response of m.
3. a kind of signal demodulating method corresponding with claim 1 be it is characterised in that after receiving multi-carrier signal, first,
Each continuous subcarrier cluster is filtered respectively, then filtered all cluster of subcarriers is demodulated, finally to demodulation after
Signal carry out constellation point demapping；
The wave filter being used when each continuous subcarrier cluster is filtered respectively is band filter, each band filter
Center frequency point υm,nLow pass cluster wave filter for each continuous subcarrier cluster to be filtered responds fkThe frequency domain midpoint of (t)；
The response of each band filter corresponding low pass cluster wave filter is to deposit from advance according to the passband width of continuous subcarrier cluster
Table look-up acquisition in the low pass cluster wave filter response table of different cluster bandwidth of storage.
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Application publication date: 20170125 |