CN103634256B - The side-lobes power of baseband signal inhibits, side-lobes power inhibits processing method and processing device - Google Patents
The side-lobes power of baseband signal inhibits, side-lobes power inhibits processing method and processing device Download PDFInfo
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Abstract
The present invention provides a kind of side-lobes powers of baseband signal to inhibit, side-lobes power inhibits processing method and processing device, wherein above-mentioned suppressing method includes: that base station obtains the edge subcarrier sequence for needing to carry out Sidelobe Suppression；Base station carries out Sidelobe Suppression conversion to the edge subcarrier sequence of acquisition；Base station selects the smallest edge subcarrier sequence of side-lobes power in the edge subcarrier sequence after carrying out Sidelobe Suppression conversion；Base station solves in the related technology to the edge subcarrier sequence that terminal sends selection, it will increase the computation complexity of MCS method when number of subcarriers is larger, and then cause to reduce the technical problems such as system availability, to reduce the side-lobes power when number of sub carrier wave is larger, computation complexity is reduced.
Description
Technical field
The present invention relates to the communications fields, press down in particular to a kind of side-lobes power inhibition of baseband signal, side-lobes power
Processing method and processing device processed.
Background technique
With being constantly progressive for radio technology, various radio traffics are emerged in multitude, and radio traffic institute
The frequency spectrum resource of support is limited, and is continuously increased in face of people to bandwidth demand, and frequency spectrum resource shows extremely nervous
Situation.This aspect is since a new generation is based on orthogonal frequency division multiplexing (Orthogonal Frequency Division
Multiplexing, referred to as OFDM) transmission technology out-of-band radiation characteristic with higher, be on the other hand to consolidate in traditional
Determine under frequency spectrum allocation model, the utilization rate of frequency spectrum resource is not but high.In a sense, frequency of the fixed allocation to authoring system
Spectrum distribution system causes the extremely nervous situation of frequency spectrum resource.And cognitive radio technology has just broken traditional frequency
Fixed allocation system is composed, frequency spectrum is dynamically distributed between system, improves the utilization efficiency of frequency spectrum.Typically, such as with people
The continuous improvement of periodic traffic demand, has been not content with simple voice data communication, and video stream media business is logical in people
Specific gravity in letter life is continuously increased, this requires bigger bandwidth as support, International Mobile (International
Mobile Telecom, referred to as IMT) system shows unprecedented frequency spectrum anxiety situation, and for radio data system
For, largely there is available spaces for frequency spectrum resource, and such as certain radio data system frequency spectrums are in certain areas
And it is not used by；Though certain radio data system frequency spectrums have covering in somewhere, certain moment are not used, whole utilization
Rate is relatively low.And the fixed frequency spectrum method of salary distribution re-use the above-mentioned frequency spectrum resource being not used by can not, such as can not be
Used in IMT system.By cognitive radio technology IMT system by the acquisition to radio data system information, the occupancy waited for an opportunity
Broadcast and TV system not used frequency spectrum resource (TVWhite Space, referred to as TVWS) on room and time, to improve broadcast
The utilization rate of television system frequency spectrum improves the situation of IMT system spectrum anxiety.It is related to the frequency of IMT system in the above process
(may be simply referred to as being reconfigured) operation is reconfigured in spectrum resource, i.e., by the idle frequency spectrum resource of original authorization spectrum disposition to other systems
On.Therefore, reconfiguration system can also be called similar to the system that can borrow other system spectral resources as above-mentioned IMT system
System；And it is called main system to the system of reconfiguration system lending resource, the user under main system is called primary user.
While subsystem waits for an opportunity to borrow main system frequency spectrum resource raising network overall performance, it is necessary to ensure principal series
The service quality of system, that is to say, that subsystem interfered caused by main system must within the tolerance interval of main system,
To guarantee that the business service quality of main system is unaffected.These primary user's protection techniques include reliable power control machine
System, primary user's discovery technique etc..
Inhibiting out-of-band radiation technology is one kind of primary user's protection technique, and this method is using signal processing technology in base band
The out-of-band radiation of subsystem signal is effectively suppressed, to avoid or reduce the interference to primary user, on the other hand, is mentioned
The high service efficiency of frequency spectrum.Especially for OFDM technology used in current mainstream standard, by its intrinsic subcarrier
Valve characteristic (as depicted in figs. 1 and 2), while bringing high spectrum utilization rate, the high out-of-band radiation of formation makes it as secondary
System access authorization frequency spectrum makes that harmful interference can be caused to main system.The technology of ofdm signal out-of-band radiation is inhibited to have at present following
It is several: (1), time-domain windowed (windowing)；(2), protection band (Guard Band, referred to as GB) is added；(3), carrier weighting
(Subcarrier Weighting, referred to as SW)；(4), constellation extension (Constellation Expansion, referred to as
CE)；(5), frequency spectrum precoding (Spectral Precoding, referred to as SP)；(6), carrier wave (Cancellation is offset in insertion
Carriers, referred to as CC).However, the above method, there are respective shortcoming and deficiency, windowing technology extends
Symbol time brings certain intersymbol interference (InterSymbol interference, referred to as ISI)；Protection is added
Certain effective bandwidth is caused to waste with GB；Carrier weighting method SW is due to calculating power to all subcarriers of system in optimization
Value, causes calculation amount excessive；The optimization algorithm of constellation extension method CE due to its many restrictive conditions and threshold value setting,
So that industrial realizability is insufficient；SP technology introduces singular value decomposition (Singular Value in transmitting terminal
Decomposition, referred to as SVD are decomposed, this will increase certain Time Delay of Systems, system performance is caused to reduce；Insertion is supported
Disappear carrier wave method since subsidiary subcarrier occupies certain transmission power so that the performance of system is by certain shadow
It rings.
In addition, there are also a kind of ofdm signal out-of-band radiation suppression technology-more options sequence (multiple-choice
Sequences, referred to as MCS), it is that (every height carries multiple groups subcarrier sequence by subcarrier sequence transformation as shown in Figure 3 and Figure 4
Wave data symbol jumps to another symbol in affiliated planisphere), therefrom select one group of son with minimum out-of-band radiation to carry
Wave train (Serial No. Q) is transmitted instead of original subcarrier sequence, and sequence number Q is encoded, with signaling method
Transmission.This method does not change the modulation system of subcarrier, and the influence to system is small, and signaling overheads is small, but this method is only studied
The case where 12 subcarriers.And in long term evolution (Long-Term Evolution, referred to as LTE) system, 20M bandwidth has
1200 subcarriers, MCS method needs convert all subcarriers, and computation complexity increases, and causes it existing
There is the practicability in system to reduce.
In view of the above problems in the related art, currently no effective solution has been proposed.
Summary of the invention
For in the related technology, the computation complexity of MCS method will increase when number of subcarriers is larger, and then cause to drop
The technical problems such as low system availability, the present invention provides a kind of side-lobes powers of baseband signal to inhibit, at side-lobes power inhibition
Method and device is managed, at least to solve the above problems.
According to an aspect of the invention, there is provided a kind of side-lobes power suppressing method of baseband signal, comprising: obtain base station
Take the edge subcarrier sequence for needing to carry out Sidelobe Suppression；Base station carries out Sidelobe Suppression to the edge subcarrier sequence of acquisition and turns
It changes；Base station selects the smallest edge subcarrier sequence of side-lobes power in the edge subcarrier sequence after carrying out Sidelobe Suppression conversion
Column；Base station sends the edge subcarrier sequence of selection to terminal.
Base station obtains the edge subcarrier sequence for needing to carry out Sidelobe Suppression: Base Transmitter bandwidth, base according to the following conditions
The center frequency point stood, the start-stop frequency outside the band of base station, the distribution proportion requirement of power in the outer start-stop frequency of base station band, wherein base
The distribution proportion with power in outer start-stop frequency of standing requires the edge subcarrier for indicating to need to carry out Sidelobe Suppression in start-stop frequency
Power in rate accounts for power percentage of all subcarriers in the start-stop frequency.
Base station sends the edge subcarrier sequence of selection to terminal, comprising: base station sends selection to terminal by signaling
Edge subcarrier sequence.
Base station sends the edge subcarrier sequence of selection by signaling to terminal, comprising: base station carries edge of selection
The call number of wave train is encoded；Call number after coding is carried and is sent in downlink control message by base station.
Base station selects side-lobes power most from the edge subcarrier sequence after progress Sidelobe Suppression conversion according to the following formula
Small edge subcarrier sequence, comprising:Wherein, N is significant figure in system
It according to the number of subcarrier, and is positive integer；fOOB_1And fOOB_2Indicate the start-stop frequency of base station Out-of-band rejection；fnIt indicates in system band
In wide situation, the centre frequency of secured transmission of payload data subcarrier；dnIndicate the data symbol of modulation constellation；A% is indicated outside the band of base station
The distribution proportion requirement of power in start-stop frequency；Si (x) indicates the frequency spectrum function of subcarrier, and si (x)=sin (x)/x.
Base station carries out the edge subcarrier sequence of acquisition before Sidelobe Suppression conversion, comprising: base station is determined to acquisition
Edge subcarrier carries out Sidelobe Suppression conversion sequence required for Sidelobe Suppression is converted.
Base station, which is determined, carries out Sidelobe Suppression conversion sequence required for Sidelobe Suppression is converted, packet to the edge subcarrier of acquisition
Include: base station inhibits to require to determine that the Sidelobe Suppression for needing to participate in Sidelobe Suppression conversion converts sequence according to the out-of-band radiation of baseband signal
Column, wherein the out-of-band radiation of baseband signal inhibit to require to indicate to carry out the side-lobes power of sequence after Sidelobe Suppression conversion relative to
It carries out side-lobes power before Sidelobe Suppression is converted and declines size.
According to another aspect of the present invention, the side-lobes power for providing a kind of baseband signal inhibits processing method, comprising:
Terminal receives the edge subcarrier sequence from base station, wherein edge subcarrier sequence is the edge that base station will obtain in advance
After subcarrier sequence carries out Sidelobe Suppression conversion, and the side-lobes power selected from the edge subcarrier sequence after conversion is the smallest
Edge subcarrier sequence；Received edge subcarrier sequence is reduced to the original edge subcarrier before Sidelobe Suppression conversion by terminal
Sequence.
Base station obtains the edge subcarrier sequence for needing to carry out Sidelobe Suppression: Base Transmitter bandwidth, base according to the following conditions
The center frequency point stood, the start-stop frequency outside the band of base station, the distribution proportion requirement of power in the outer start-stop frequency of base station band, wherein base
The distribution proportion with power in outer start-stop frequency of standing requires the edge subcarrier for indicating to need to carry out Sidelobe Suppression in start-stop frequency
Power in rate accounts for power percentage of all subcarriers in the start-stop frequency.
According to a further aspect of the invention, the side-lobes power for providing a kind of baseband signal inhibits device, is located at base station
In, comprising: module is obtained, needs to carry out the edge subcarrier sequence of Sidelobe Suppression for obtaining；Conversion module, for acquisition
Edge subcarrier sequence carry out Sidelobe Suppression conversion；Selecting module is carried for edge after carrying out Sidelobe Suppression conversion
The smallest edge subcarrier sequence of side-lobes power is selected in wave train；Sending module, for sending edge of selection to terminal
Carrier wave sequence.
Above-mentioned acquisition module, for needing to carry out the edge subcarrier sequence of Sidelobe Suppression: base according to the following conditions acquisition
It stands transmitted bandwidth, the center frequency point of base station, the start-stop frequency outside the band of base station, the distribution proportion of power in the outer start-stop frequency of base station band
It is required that, wherein the distribution proportion of power requires edge for indicating to need to carry out Sidelobe Suppression to carry in the outer start-stop frequency of base station band
Wave accounts for power percentage of all subcarriers in the start-stop frequency in the power in the start-stop frequency.
According to a further aspect of the invention, the side-lobes power for providing a kind of baseband signal inhibits processing unit, is located at
In terminal, comprising: receiving module, for receiving the edge subcarrier sequence from base station, wherein edge subcarrier sequence is
After the edge subcarrier sequence obtained in advance is carried out Sidelobe Suppression conversion by base station, and from the edge subcarrier sequence after conversion
The smallest edge subcarrier sequence of the side-lobes power of selection；Recovery module, for received edge subcarrier sequence to be reduced to
Original edge subcarrier sequence before Sidelobe Suppression conversion
Through the invention, secondary lobe suppression is carried out using the edge subcarrier sequence that needs carry out Sidelobe Suppression of the base station to acquisition
System conversion, and the technical solution of the smallest edge subcarrier sequence of side-lobes power is therefrom selected, it solves in the related technology, in son
It will increase the computation complexity of MCS method when number of carrier wave is larger, and then cause to reduce the technical problems such as system availability, thus
The side-lobes power when number of sub carrier wave is larger is reduced, computation complexity is reduced.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is (sub-carrier number 12, left and right are each according to the spectrum power of two kinds of difference BPSK symbol sebolic addressings of the relevant technologies
12 secondary lobes) schematic diagram；
Fig. 2 is the power spectrum and secondary lobe range schematic diagram according to the OFDM symbol sequence of the relevant technologies；
Fig. 3 is to emit block diagram according to the OFDM with MCS Sidelobe Suppression module of the relevant technologies；
Fig. 4 is the MCS Sidelobe Suppression algorithm principle schematic diagram according to the relevant technologies；
Fig. 5 is the flow chart according to the side-lobes power suppressing method of the baseband signal of the embodiment of the present invention 1；
Fig. 6 is the structural block diagram for inhibiting device according to the side-lobes power of the baseband signal of the embodiment of the present invention 1；
Fig. 7 is the flow chart for inhibiting processing method according to the side-lobes power of the baseband signal of the embodiment of the present invention 2；
Fig. 8 is the structural block diagram for inhibiting processing unit according to the side-lobes power of the baseband signal of the embodiment of the present invention 2；
Fig. 9 is that the OFDM according to the left side of the embodiment of the present invention 3 with Sidelobe Suppression module emits block diagram；
Figure 10 is that the OFDM according to the right of the embodiment of the present invention 3 with Sidelobe Suppression module emits block diagram；
Figure 11 is to emit block diagram according to the OFDM of the double-side band Sidelobe Suppression module of the embodiment of the present invention 3；
Figure 12 is the side lobe suppression method flow chart according to the ofdm communication system signal spectrum of the embodiment of the present invention 4.
Specific embodiment
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and in combination with Examples.It should be noted that not conflicting
In the case of, the features in the embodiments and the embodiments of the present application can be combined with each other.
In view of in the related technology, will increase the computation complexity of MCS method when number of subcarriers is larger, and then cause
The technical problems such as system availability are reduced, relevant solution is provided with reference to embodiments, is now described in detail.
Embodiment 1
Fig. 5 is the flow chart according to the side-lobes power suppressing method of the baseband signal of the embodiment of the present invention 1.As shown in figure 5,
This method comprises:
Step S502, base station obtain the edge subcarrier sequence for needing to carry out Sidelobe Suppression；
Step S504, base station carry out Sidelobe Suppression conversion to the edge subcarrier sequence of acquisition；
Step S506, base station select side-lobes power the smallest in the edge subcarrier sequence after carrying out Sidelobe Suppression conversion
Edge subcarrier sequence；
Step S508, base station send the edge subcarrier sequence of selection to terminal.
By above-mentioned processing step, since base station is the edge subcarrier sequence progress Sidelobe Suppression conversion that will acquire, and
Therefrom the selection the smallest edge subcarrier sequence of side-lobes power is sent, and is turned instead of Sidelobe Suppression is carried out to all subcarriers
Therefore the technological means changed can reduce side-lobes power of the system when number of sub carrier wave is larger, operand reduces, to drop
Low computation complexity.
Base station, which obtains, to need to carry out there are many edge subcarrier sequences of Sidelobe Suppression, such as can be from external device (the
Three method, apparatus) in obtain, can also be taking human as specified, in a preferred embodiment of the present invention, base station is according to the following conditions
Obtain the edge subcarrier sequence for needing to carry out Sidelobe Suppression:
Base Transmitter bandwidth, the center frequency point of base station, the start-stop frequency outside the band of base station, power in the outer start-stop frequency of base station band
Distribution proportion requirement, wherein the distribution proportion of power requires to indicate to need to carry out Sidelobe Suppression in the outer start-stop frequency of base station band
Edge subcarrier account for power percentage of all subcarriers in the start-stop frequency in the power in the start-stop frequency.
In the specific implementation process, step S504 and step S506 can show as following implemented form: Sidelobe Suppression mould
Block includes multiple groups symbol conversion sequence, and each subcarrier data symbol of input is respectively the same as each symbol in every group of conversion sequence
It carries out being added modulus operation, obtains multi-group data symbol sebolic addressing, then calculate the side-lobes power of multi-group data symbol sebolic addressing, output
That corresponding group code sequence of minimum side-lobes power, and sequence number is encoded, it is sent with signaling method.
In the present embodiment, base station can send the edge subcarrier sequence of selection by signaling to terminal, which can
Think the signaling of Sidelobe Suppression module output.
When base station sends the edge subcarrier sequence of selection to terminal by signaling, including following treatment process: base station
The call number of the edge subcarrier sequence of selection is encoded；Base station carries the call number after coding in downlink control message
It is sent in (such as DCIformat1 message).
In the present embodiment, base station is according to the edge subcarrier sequence that can select progress Sidelobe Suppression by following formula
(from i to X):
Wherein,
N is the number of valid data subcarrier in system, and is positive integer；fOOB_1And fOOB_2Indicate the outer start-stop of base station band
Frequency；fnIndicate the centre frequency of secured transmission of payload data subcarrier in system bandwidth；dnIndicate the data of modulation constellation
Symbol；A% indicates the distribution proportion requirement of power in the outer start-stop frequency of base station band,；Si (x) indicates the frequency spectrum function of subcarrier, and
si(x)=sin(x)/x。
In the present embodiment, before base station carries out Sidelobe Suppression conversion to the edge subcarrier sequence of acquisition, base station needs
It determines and Sidelobe Suppression conversion sequence required for Sidelobe Suppression is converted is carried out to the edge subcarrier of acquisition.Believed according to base band base station
Number out-of-band radiation inhibit require determine need to participate in Sidelobe Suppression conversion Sidelobe Suppression conversion sequence, wherein baseband signal
Out-of-band radiation inhibit require indicate carry out Sidelobe Suppression conversion after sequence side-lobes power relative to carry out Sidelobe Suppression conversion
Preceding side-lobes power declines size.
The side-lobes power for additionally providing a kind of baseband signal in the present embodiment inhibits device, which is located in base station,
For realizing above-described embodiment and preferred embodiment, the descriptions that have already been made will not be repeated, below to involved in the device
To module be illustrated.As used below, the group of the software and/or hardware of predetermined function may be implemented in term " module "
It closes.Although device described in following embodiment is preferably realized with software, the combination of hardware or software and hardware
Realization be also that may and be contemplated.Fig. 6 is to inhibit device according to the side-lobes power of the baseband signal of the embodiment of the present invention 1
Structural block diagram.As shown in fig. 6, the device includes:
Module 60 is obtained, conversion module 62 is connected to, needs to carry out the edge subcarrier sequence of Sidelobe Suppression for obtaining；
Conversion module 62 is connected to selecting module 64, for carrying out to the edge subcarrier sequence for obtaining the acquisition of module 60
Sidelobe Suppression conversion；
Selecting module 64 is connected to sending module 66, for the edge subcarrier sequence after carrying out Sidelobe Suppression conversion
The middle the smallest edge subcarrier sequence of selection side-lobes power；
Sending module 66, for sending the edge subcarrier sequence that selecting module 64 selects to terminal.
By the function of above-mentioned processing modules implement, the edge subcarrier sequence that equally base station can be made to will acquire carries out other
Valve inhibit conversion, and therefrom selection the smallest edge subcarrier sequence of side-lobes power sent, instead of to all subcarriers into
Therefore the conversion of row Sidelobe Suppression can reduce side-lobes power of the system when number of sub carrier wave is larger, operand reduces, thus
Reduce computation complexity
In the present embodiment, module 60 is obtained, for needing to carry out edge of Sidelobe Suppression according to the following conditions acquisition
Carrier wave sequence: Base Transmitter bandwidth, the center frequency point of base station, the start-stop frequency outside the band of base station, function in the outer start-stop frequency of base station band
The distribution proportion requirement of rate, wherein the distribution proportion of power requires to indicate to need to carry out secondary lobe suppression in the outer start-stop frequency of base station band
The edge subcarrier of system accounts for power percentage of all subcarriers in the start-stop frequency in the power in the start-stop frequency.
Embodiment 2
The present embodiment is corresponding with embodiment 1, and difference is only that, the present embodiment is illustrated from terminal side.Fig. 7 is root
Inhibit the flow chart of processing method according to the side-lobes power of the baseband signal of the embodiment of the present invention 2.As shown in fig. 7, this method comprises:
Step S702, terminal receive the edge subcarrier sequence from base station, wherein edge subcarrier sequence is base station
After the edge subcarrier sequence obtained in advance is carried out Sidelobe Suppression conversion, and selected from the edge subcarrier sequence after conversion
The smallest edge subcarrier sequence of side-lobes power；
Received edge subcarrier sequence is reduced to original edge before Sidelobe Suppression is converted and carried by step S704, terminal
Wave train.At this point, terminal and base station can pass through Sidelobe Suppression conversion sequence having the same.
Similar with embodiment 1, base station obtains the edge subcarrier sequence for needing to carry out Sidelobe Suppression: base according to the following conditions
It stands transmitted bandwidth, the center frequency point of base station, the start-stop frequency outside the band of base station, the distribution proportion of power in the outer start-stop frequency of base station band
It is required that, wherein the distribution proportion of power requires edge for indicating to need to carry out Sidelobe Suppression to carry in the outer start-stop frequency of base station band
Wave accounts for power percentage of all subcarriers in the start-stop frequency in the power in the start-stop frequency.
In the present embodiment, the side-lobes power for additionally providing a kind of baseband signal inhibits processing unit, is located in terminal, should
For device for realizing the above method, Fig. 8 is to inhibit processing unit according to the side-lobes power of the baseband signal of the embodiment of the present invention 2
Structural block diagram.As shown in figure 8, the device includes:
Receiving module 80 is connected to recovery module 82, for receiving the edge subcarrier sequence from base station, wherein
After the edge subcarrier sequence obtained in advance is carried out Sidelobe Suppression conversion for base station by edge subcarrier sequence, and after conversion
The smallest edge subcarrier sequence of the side-lobes power selected in edge subcarrier sequence；
Recovery module 82, for received edge subcarrier sequence to be reduced to original edge before Sidelobe Suppression conversion
Carrier wave sequence.At this point, terminal and base station can be realized by Sidelobe Suppression conversion sequence having the same.
Above-described embodiment 1 and embodiment 2 in order to better understand, 3-6 is described in detail with reference to embodiments.Implement below
The main design idea of example is that base station determines the quantity and Sidelobe Suppression sequence of modules of edge subcarrier according to control condition
Quantity, edge subcarrier is input to Sidelobe Suppression module, exports new edge subcarrier data symbol and signaling；Terminal root
The edge subcarrier data symbol received is regenerated to original edge subcarrier data symbol it is believed that enabling.
Wherein, above-mentioned control condition includes: Base Transmitter bandwidth, the center frequency point of base station, the start-stop frequency outside the band of base station,
The distribution proportion requirement of power, the out-of-band radiation of baseband signal inhibit to require in the outer start-stop frequency of base station band；The outer start-stop of base station band
The distribution proportion of power requires to refer to a percentages in frequency, i.e., to carry out the edge subcarrier of Sidelobe Suppression and rise at this
Only the power in frequency accounts for power percentage of all subcarriers in the start-stop frequency.System is right under this proportion requirement
Edge subcarrier carries out the equivalent of Sidelobe Suppression in the effect that all subcarriers are carried out with Sidelobe Suppression；The baseband signal
Out-of-band radiation inhibit require be Sidelobe Suppression module output sequence side-lobes power than list entries side-lobes power decline size
(statistical value) is indicated with dB value；The edge number of subcarriers, which refers to, can satisfy power in the outer start-stop frequency of base station band
Distribution proportion requires the quantity of the edge subcarrier of (percentage).
Embodiment 3
The thinking of the present embodiment is that the edge subcarrier data symbol sebolic addressing of ofdm system is input to Sidelobe Suppression module,
As shown in 9-11, therefrom there is one group of data symbol sequence of minimum side-lobes power to be transmitted for selection, to reduce OFDM
The side-lobes power of system, reduce band outward leakage, while do not influence ofdm system modulation and demodulation and DFT/IDFT or
FFT/IFFT。
In order to achieve the above objectives, technical solution used by the present embodiment is as follows:
As shown in figure 12, this method comprises:
Step S1202 requires the determining subcarrier for participating in Sidelobe Suppression of a% according to system out-of-band radiation power distribution proportion
Sequence；
Step S1204, the inhibition requirement according to system to Sidelobe Suppression module, determines the conversion sequence in Sidelobe Suppression module
Number of columns P；
Step S1206, by the sub-carrier sequence inputting in step S1202 to Sidelobe Suppression module, from obtained P group
New sub-carrier sequence, and every group of side-lobes power is calculated, select the sub-carrier sequence Q (0 with minimum side-lobes power
≤ Q≤P-1) output as Sidelobe Suppression module, wherein the call number of Q expression sub-carrier sequence；
Multiple sons of Sidelobe Suppression are not participated in each sub-carrier and step S1202 in step S1208, sequence Q
Symbols are transmitted together, and Q is carried out binary coding, are sent with signaling method；
Step S1210, receiver end restore sub-carrier according to Q.
Subcarrier side lobe suppression method in edge provided in this embodiment can be effectively reduced ofdm system in number of sub carrier wave
Side-lobes power in larger situation, operand is small, and computation complexity is low, does not change the modulation system of data symbol, to system
It influences small.
Embodiment 4
Method flow in the present embodiment is based on process shown in Figure 12, i.e., similar with the process in embodiment 3, only compiles
Number difference.The present embodiment carries out edge subcarrier Sidelobe Suppression for 300 subcarriers in LTE system 5M bandwidth.In bandwidth
The serial number of each subcarrier, left side: -150, -149, -148...-1；Right side: 1,2...150.
Assuming that the outer area requirement of system band is (left side band): in left side (the i.e. negative frequency model of system bandwidth of system bandwidth
Enclose left side), from frequency range-fOOB_2To-fOOB_1.Assuming that the unilateral out-of-band radiation power distribution proportion requirement of system is to require a%.
Assuming that system is Y(dB to the inhibition requirement of Sidelobe Suppression module).
The first step can calculate the minimum value X for meeting a% requirement according to following formula, so left edge is from -150 to X
These (X+150+1) a subcarriers are selected to select carry out Sidelobe Suppression.Further X+150+1 is preferably 12 multiple.
Wherein,
F indicates frequency；
fnIndicate the centre frequency of 300 secured transmission of payload data subcarriers in 5MHz system bandwidth；
dnIndicate the data symbol of modulation constellation；
Si (x) representative function si (x)=sin (x)/x.
Second step requires Y(dB to the inhibition of Sidelobe Suppression module according to system), determine the conversion in Sidelobe Suppression module
Sequence quantity P.The suppression result of Sidelobe Suppression module has with the conversion sequence quantity P in the modulation system and module of subcarrier
It closes.System is in the case where known subcarrier modulation modes according to inhibiting the requirement can to obtain corresponding Y(dB) conversion sequence quantity
P.Then system generates P group conversion sequence at random(0≤p≤P-1), each element in each group
It is the label of constellation point, with dn(- 150≤n≤X) belongs to identical planisphere.Further, transmitting terminal and receiving end save phase
Same P group conversion sequence.
Third step, by sub-carrier sequence (d-150, d-149...dX) it is input to Sidelobe Suppression module, which generates P
The new sub-carrier sequence of group(0≤p≤P-1).The formula of the step is (- 150≤n≤X), wherein MnIt is symbol dnNumber of constellation points in affiliated planisphere, inIt is dnStar in planisphere
Seat point serial number.It can be obtained by planisphere mappingThen every group of side-lobes power A is calculated according to following formulap:
Therefrom select minimum side-lobes power AQ=min(A0, A1…AP-1) corresponding symbol sebolic addressing(0≤Q≤P-1), the output as Sidelobe Suppression module.
4th step, willIFFT is carried out, while Q is subjected to binary system
Row coding, and be put into DCI format1 message (part " Q " and " bit ") and transmitted that (DCI format1 message format is detailed
See 3GPP TS 36.212-a60 5.3.3.1.2 trifle of page 57), as follows:
The following information is transmitted by means of the DCI format1:
-Carrier indicator-0 or 3 bits.
-Resource allocation header(resource allocation type0/type1)-1bit
If downlink bandwidth is less than or equal to10PRBs, there is no
resource allocation header and resource allocation type0is assumed.
- Resource block assignment:
- For resource allocation type0:
-bits provide the resource allocation
- For resource allocation type1:
-bits of this field are used as a header specific to this
resource allocation type to indicate the selected resource blocks subset
-1bit indicates a shift of the resource allocation span
-bits provide the resource allocation
where the value of P depends on the number of DL resource blocks
-Modulation and coding scheme-5bits
- HARQ process number-3bits (FDD), 4bits (TDD)
-New data indicator-1bit
-Red undancy version-2bits
-TPC command for PUCCH-2bits
-Downlink Assignment Index(this field is present in TDD for all the
uplink-downlink configurations and only applies to TDD operation with uplink-
downlink configuration1-6.This field is not present in FDD)-2bits
-
5th step, receiver end is according in DCI format1Determine Sidelobe Suppression module
Conversion sequence(0≤Q≤P-1) then will be received InConstellation piont markIt decodes: (- 150≤n≤X), can restore symbol (d-150, d-149...dX).
Embodiment 4
The present embodiment is similar with embodiment 3, and only the frequency range of system Out-of-band rejection is the right band (fOOB_1To-
fOOB_2), the subcarrier serial number of Sidelobe Suppression is carried out from X to 150, other processes are the same as specific embodiment 3.
Embodiment 5:
The present embodiment is similar with embodiment 3, and difference is: inhibition is proposed for double-side band and is required:
Left side band (- fOOB_2To-fOOB_1), the subcarrier serial number of Sidelobe Suppression is carried out from -150 to Xleft, MCS inhibition mould
Block has P for the left sideleftGroup conversion sequence, finally exports Qleft；
The right band (fOOB_1To fOOB_2), the subcarrier serial number of Sidelobe Suppression is carried out from XrightTo 150, MCS suppression module
P is had for the rightrightGroup conversion sequence, finally exports Qright；
It include Q in DCI format1 messageleftAnd QrightBinary coding.
In another embodiment, a kind of software is additionally provided, the software is for executing above-described embodiment and preferred reality
Apply technical solution described in mode.
In another embodiment, a kind of storage medium is additionally provided, above-mentioned software is stored in the storage medium, it should
Storage medium includes but is not limited to: CD, floppy disk, hard disk, scratch pad memory etc..
Obviously, those skilled in the art should be understood that each module of the above invention or each step can be with general
Computing device realize that they can be concentrated on a single computing device, or be distributed in multiple computing devices and formed
Network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored
It is performed by computing device in the storage device, and in some cases, it can be to be different from shown in sequence execution herein
Out or description the step of, perhaps they are fabricated to each integrated circuit modules or by them multiple modules or
Step is fabricated to single integrated circuit module to realize.In this way, the present invention is not limited to any specific hardware and softwares to combine.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of side-lobes power suppressing method of baseband signal characterized by comprising
Base station obtains the edge subcarrier sequence for needing to carry out Sidelobe Suppression according to the following conditions:
Base Transmitter bandwidth, the center frequency point of base station, the start-stop frequency outside the band of base station, point of power in the outer start-stop frequency of base station band
Cloth proportion requirement, wherein the distribution proportion of power requires to indicate to need to carry out Sidelobe Suppression in the outer start-stop frequency of the base station band
Edge subcarrier account for power percentage of all subcarriers in the start-stop frequency in the power in the start-stop frequency；
The base station carries out Sidelobe Suppression conversion to the edge subcarrier sequence of acquisition；
The base station the smallest edge load of selection side-lobes power in the edge subcarrier sequence after carrying out Sidelobe Suppression conversion
Wave train；
The base station sends the edge subcarrier sequence of selection to terminal；
Wherein, the base station obtains the edge subcarrier sequence for needing to carry out Sidelobe Suppression according to the following formula, comprising:
Wherein,
NIt for the number of valid data subcarrier in system, and is positive integer；fOOB_1And fOOB_2Indicate the start-stop of base station Out-of-band rejection
Frequency；fnIndicate the centre frequency of secured transmission of payload data subcarrier in system bandwidth；dnIndicate the data of modulation constellation
Symbol；A% indicates the distribution proportion requirement of power in the outer start-stop frequency of base station band；Si (x) indicates the frequency spectrum function of subcarrier, and
Si (x)=sin (x)/x, X are the edge subcarrier sequence for needing to carry out Sidelobe Suppression.
2. the method according to claim 1, wherein the base station sends the edge subcarrier sequence of selection to terminal
Column, comprising:
The base station sends the edge subcarrier sequence of selection by signaling to terminal.
3. according to the method described in claim 2, it is characterized in that, the base station sends the edge of selection by signaling to terminal
Subcarrier sequence, comprising:
The base station encodes the call number of the edge subcarrier sequence of selection；
The call number after coding is carried and is sent in downlink control message by the base station.
4. method according to any one of claims 1 to 3, which is characterized in that edge subcarrier of the base station to acquisition
Sequence carries out before Sidelobe Suppression conversion, comprising:
The base station determines that carrying out Sidelobe Suppression required for Sidelobe Suppression is converted to the edge subcarrier sequence of acquisition converts sequence
Column.
5. according to the method described in claim 4, it is characterized in that, the base station determine to the edge subcarrier sequence of acquisition into
Sidelobe Suppression conversion sequence required for row Sidelobe Suppression is converted, comprising:
The base station inhibits to require to determine the Sidelobe Suppression for needing to participate in Sidelobe Suppression and converting according to the out-of-band radiation of baseband signal
Conversion sequence, wherein the out-of-band radiation of the baseband signal inhibits the secondary lobe of sequence after requiring expression to carry out Sidelobe Suppression conversion
Power declines size relative to side-lobes power before Sidelobe Suppression is converted is carried out.
6. a kind of side-lobes power of baseband signal inhibits processing method characterized by comprising
Terminal receives the edge subcarrier sequence from base station, wherein the edge subcarrier sequence is that the base station will be pre-
After the edge subcarrier sequence first obtained carries out Sidelobe Suppression conversion, and the side selected from the edge subcarrier sequence after conversion
The smallest edge subcarrier sequence of valve power, the base station obtain the edge load for needing to carry out Sidelobe Suppression according to the following conditions
Wave train: Base Transmitter bandwidth, the center frequency point of base station, the start-stop frequency outside the band of base station, power in the outer start-stop frequency of base station band
Distribution proportion requirement, wherein the distribution proportion of power requires to indicate to need to carry out secondary lobe in the outer start-stop frequency of the base station band
The edge subcarrier of inhibition accounts for power percentage of all subcarriers in the start-stop frequency in the power in the start-stop frequency；
The received edge subcarrier sequence is reduced to the original edge subcarrier sequence before Sidelobe Suppression conversion by the terminal
Column；
Wherein, the base station obtains the edge subcarrier sequence for needing to carry out Sidelobe Suppression according to the following formula, comprising:
Wherein,
NIt for the number of valid data subcarrier in system, and is positive integer；fOOB_1And fOOB_2Indicate the start-stop of base station Out-of-band rejection
Frequency；fnIndicate the centre frequency of secured transmission of payload data subcarrier in system bandwidth；dnIndicate the data of modulation constellation
Symbol；A% indicates the distribution proportion requirement of power in the outer start-stop frequency of base station band；Si (x) indicates the frequency spectrum function of subcarrier, and
Si (x)=sin (x)/x, X are the edge subcarrier sequence for needing to carry out Sidelobe Suppression.
7. a kind of side-lobes power of baseband signal inhibits device, it is located in base station characterized by comprising
Module is obtained, for needing to carry out the edge subcarrier sequence of Sidelobe Suppression: Base Transmitter band according to the following conditions acquisition
Width, the center frequency point of base station, the start-stop frequency outside the band of base station, the distribution proportion requirement of power in the outer start-stop frequency of base station band,
In, the distribution proportion of power requires to indicate that the edge subcarrier for needing to carry out Sidelobe Suppression exists in the outer start-stop frequency of the base station band
Power in the start-stop frequency accounts for power percentage of all subcarriers in the start-stop frequency；
Conversion module, for carrying out Sidelobe Suppression conversion to the edge subcarrier sequence of acquisition；
Selecting module, for selecting the smallest edge of side-lobes power in the edge subcarrier sequence after carrying out Sidelobe Suppression conversion
Subcarrier sequence；
Sending module, for sending the edge subcarrier sequence of selection to terminal；
Wherein, the acquisition module is also used to obtain the edge subcarrier sequence for needing to carry out Sidelobe Suppression according to the following formula,
Include:Wherein,
NIt for the number of valid data subcarrier in system, and is positive integer；fOOB_1And fOOB_2Indicate the start-stop of base station Out-of-band rejection
Frequency；fnIndicate the centre frequency of secured transmission of payload data subcarrier in system bandwidth；dnIndicate the data of modulation constellation
Symbol；A% indicates the distribution proportion requirement of power in the outer start-stop frequency of base station band；Si (x) indicates the frequency spectrum function of subcarrier, and
Si (x)=sin (x)/x, X are the edge subcarrier sequence for needing to carry out Sidelobe Suppression.
8. a kind of side-lobes power of baseband signal inhibits processing unit, it is located in terminal characterized by comprising
Receiving module, for receiving the edge subcarrier sequence from base station, wherein the edge subcarrier sequence is described
After the edge subcarrier sequence obtained in advance is carried out Sidelobe Suppression conversion by base station, and from the edge subcarrier sequence after conversion
The smallest edge subcarrier sequence of the side-lobes power of selection, the base station need to carry out Sidelobe Suppression according to the following conditions acquisition
Edge subcarrier sequence: Base Transmitter bandwidth, the center frequency point of base station, the start-stop frequency outside the band of base station, the outer start-stop frequency of base station band
The distribution proportion requirement of power in rate, wherein the distribution proportion of power requires to indicate to need in the outer start-stop frequency of the base station band
The edge subcarrier for carrying out Sidelobe Suppression accounts for power of all subcarriers in the start-stop frequency in the power in the start-stop frequency
Percentage；
Recovery module is carried for the received edge subcarrier sequence to be reduced to original edge before Sidelobe Suppression conversion
Wave train；
Wherein, the base station obtains the edge subcarrier sequence for needing to carry out Sidelobe Suppression according to the following formula, comprising:
Wherein,
NIt for the number of valid data subcarrier in system, and is positive integer；fOOB_1And fOOB_2Indicate the start-stop of base station Out-of-band rejection
Frequency；fnIndicate the centre frequency of secured transmission of payload data subcarrier in system bandwidth；dnIndicate the data of modulation constellation
Symbol；A% indicates the distribution proportion requirement of power in the outer start-stop frequency of base station band；Si (x) indicates the frequency spectrum function of subcarrier, and
Si (x)=sin (x)/x, X are the edge subcarrier sequence for needing to carry out Sidelobe Suppression.
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| CN108540418B (en) * | 2017-03-06 | 2022-05-03 | 中兴通讯股份有限公司 | Data modulation method and device for edge sub-band |
| CN109581299B (en) * | 2018-12-11 | 2022-04-22 | 湖南华诺星空电子技术有限公司 | Ultra-wideband step-frequency continuous wave pulse compression sidelobe suppression method |
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