CN108365875A - The method and mimo system of multiple antennas PAPR are reduced based on precoding - Google Patents
The method and mimo system of multiple antennas PAPR are reduced based on precoding Download PDFInfo
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- CN108365875A CN108365875A CN201810172353.8A CN201810172353A CN108365875A CN 108365875 A CN108365875 A CN 108365875A CN 201810172353 A CN201810172353 A CN 201810172353A CN 108365875 A CN108365875 A CN 108365875A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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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
- H04L27/2614—Peak power aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The present invention provides a kind of method and mimo system reducing multiple antennas PAPR based on precoding, the method includes：The N group virtual signal data flows that useful signal data stream is provided and is randomly generated；The N groups virtual signal data flow is mapped to by precoding on transmitting antenna with the useful signal data flow respectively, obtains N groups transmitting signal in advance；To the N groups, transmitting signal carries out inverse fast Fourier transform in advance；It calculates every group and emits the PAPR of signal in advance, and make comparisons, select one group of PAPR minimums in the pre- transmitting signal of the N groups to emit signal in advance and sent.The present invention uses for reference the thought that precoding technique in multiuser MIMO eliminates inter-user interference, regard virtual data streams as other users signal, by precoding technique so that receiving terminal receives only useful signal, this method effectively reduces system peak-to-average ratio, lifting system power efficiency, and system structure is had no need to change, it is cost-effective.
Description
Technical field
The present invention relates to wireless communication technology fields, more particularly to a kind of side reducing multiple antennas PAPR based on precoding
Method and mimo system.
Background technology
MIMO (Multiple-Input Multiple-Output) technology refers to being used respectively in transmitting terminal and receiving terminal
Multiple transmitting antennas and reception antenna make signal pass through the mutiple antennas transmission of transmitting terminal and receiving terminal and receive, so as to improve
Communication quality.It can make full use of space resources, realize multiple-input multiple-output by mutiple antennas, do not increasing frequency spectrum resource and day
In the case of line transmission power, system channel capacity can be increased exponentially, apparent advantage is shown, is increasingly becoming movement
The core technology of communication.
Orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) technology can be with
Very high message transmission rate is obtained, its modulation and demodulation are based respectively on inverse fast Fourier transform (Inverse Fast
Fourier Transform, IFFT) and Fast Fourier Transform (FFT) (Fast Fourier Transform, FFT) come what is realized,
It is a kind of multi-carrier transmission scheme that implementation complexity is minimum, most widely used.However, since OFDM symbol is by multiple independences
What the sub-carrier signal through ovennodulation was formed by stacking, when each sub-carrier phase is same or similar, superposed signal will be by
To the modulation of identical initial phase signal higher peak value is thus further brought to generate larger instantaneous power peak value
Average power ratio (peak-to-average power ratio, PAPR).When encountering such as power amplifier in transmission process
With as mixer when non-linear element, since the dynamic range of general power amplifier is all limited, so peak is equal
Bigger MIMO-OFDM signals easily ingoing power amplifier nonlinearity region causes signal to generate non-linear distortion,
Apparent spread spectrum interference and inband signaling distortion are caused, whole system performance degradation is caused.It needs at this time more
Back-off (back-off) so that signal power is returned in the range of linearity of power amplifier, this necessarily leads to power efficiency
It is relatively low.The major technique that high peak-to-average power ratio has become MIMO-OFDM hinders.It would therefore be desirable to study PAPR reduction technologies
To reduce cost and improve the power efficiency of communication system.
PAPR's on l root transmitting antennas is specifically defined as：
Wherein, xl(n) it is the transmitting signal on l root transmitting antennas, N is the total quantity of ofdm signal sub-carriers, E
() indicates it is expected.
Due to thering are more antennas, system PAPR to be defined as in mimo system：
Wherein, L is the quantity of transmitting antenna.
For high PAPR problems, there are numerous technical solutions for inhibiting PAPR at present, be broadly divided into following two categories：
1, the PAPR suppression technologies damaged.Include mainly slicing, filter chopping techniques, is used for clipping signal amplitudes, but this
It can lead to distorted signals, lose system performance；
2, lossless PAPR suppression technologies.Include mainly Choose for user (Selected Mapping, SLM), planisphere expansion
Open up (Active Constellation Extension, ACE) and partial transmission sequence (partial transmit
Sequence, PTS) etc. technologies, some in these technologies need transmitting terminal to transmit additional information, need that existing communication system is transformed
System, and other then have lower message transmission rate, all these methods to be required for additional meter compared with traditional OFDM
Resource is calculated to execute.
Application No. is the inventions of CN201410268749.4 by one of University of Electronic Science and Technology, disclose a kind of reduction MIMO-
The PTS method of OFDM systems PAPR, source bits carry out sub-block segmentation after baseband modulation, serioparallel exchange, then pass through respectively
IFFT modulates to obtain time domain sub-block signal, realizes phase change by the cyclic shift of the different length of sub-block, and pass through antenna
Between sub-block exchange to obtain more alternative sequences, in the case that identical IFFT modulation number can obtain more alternative sequences
Set realizes the blind Detecting of reception signal by comparing signal is reversely rotated at a distance from signal constellation point.But this is blind
Detection method computation complexity is larger.
Zhejiang Normal University application No. is a kind of reduction MIMO-OFDM systems of the disclosure of the invention of CN201410031169.3
Antenna is grouped by the method for the PAPR of system, this method two-by-two, and the degree of freedom that spatial domain is carried out to every group of antenna data extends, and obtains
Sequence relatively preferably to be transmitted, then SLM technologies are applied in a frequency domain, it obtains the optimal data sequence of current performance and is passed
It is defeated, the phase sequence for meeting orthogonality relation on the antenna matched with it is mapped out by the phase sequence on a strip antenna, is reduced
The calculation amount and side information amount of traditional algorithm.But this method still needs to side information amount passing to receiving terminal, in channel
Information is faced in transmission process loses the problem of increasing with transmission cost.
Invention content
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide one kind is reduced more days based on precoding
The method and mimo system of line PAPR influences asking for system performance for solving due to PAPR higher in MIMO-OFDM systems
Topic.
To achieve the above object, the present invention uses following scheme：A method of multiple antennas PAPR is reduced based on precoding,
It the described method comprises the following steps：Step 1), the N group virtual signal data flows that useful signal data stream is provided and is randomly generated,
Wherein, N is the positive integer more than or equal to 2；Step 2), by the N groups virtual signal data flow respectively with the useful signal number
It is mapped on transmitting antenna by precoding according to stream, obtains N groups transmitting signal in advance；Step 3) emits signal in advance to the N groups
Carry out inverse fast Fourier transform；Step 4), every group of calculating emit the PAPR of signal, and make comparisons in advance, select the N groups pre-
PAPR is minimum in transmitting signal one group emits signal and is sent in advance.
Further include by quadrature amplitude modulation or orthorhombic phase in the step 1) in one embodiment of the present invention
It moves key modulation method and modulates the useful signal data flow and the N groups virtual signal data flow.
In one embodiment of the present invention, in the step 1), the N is randomly generated by Monte Carlo method
Group virtual signal data flow.
Further include the normalization useful signal data flow in the step 2) in one embodiment of the present invention
Power and the virtual signal data flow power, obtain the power of useful signal data flow and the power of virtual data streams
Ratio.
In one embodiment of the present invention, the pre-coding matrix used in the precoding is block diagonalization precoding square
Battle array.
In one embodiment of the present invention, the pre-coding matrix meets the following conditions：Q (k)=[Q1(k),Q2(k)],
H(k)Q2(k)=H2(k)Q1(k)=0, wherein Q (k) is pre-coding matrix, Q1(k) be useful signal data flow precoding
Matrix, Q2(k) be virtual signal data flow pre-coding matrix, H2(k) it is channel status letter of the transmitting terminal to virtual receiving terminal
Breath, H (k) are known channel state information.
In one embodiment of the present invention, the method for reducing multiple antennas PAPR based on precoding is applicable in scene and includes
Multiuser MIMO scene and extensive MIMO scene.
The present invention also provides a kind of mimo system reducing multiple antennas PAPR based on precoding, the mimo system includes hair
Sending end and receiving terminal, the transmitting terminal include at least：Signal modulator receives the useful signal data flow and difference of different capacity
The virtual signal data flow of power, suitable for being modulated with signal data stream and virtual signal data flow to described；Precoding mould
Block, the input terminal of the precoding module connect the output end of the signal modulator, suitable for described using signal to modulated
If data flow and virtual signal data flow carry out precoding to obtain intervening transmitting signal, wherein the number of the pre- transmitting signal
Amount is consistent with the quantity of virtual signal data flow；Inverse Fourier transform module, the input of the inverse Fourier transform module
End connects the output end of the precoding module, is suitable for carrying out inverse Fourier transform to each pre- transmitting signal respectively；Power amplification
Device, the input terminal of the power amplifier connect the output end of the inverse Fourier transform module, are suitable for inverse to the Fourier
The output signal of conversion module carries out power amplification；The input terminal of transmission antenna, the transmission antenna connects the power amplification
The output end of device is transmitted wirelessly suitable for the output signal to the power amplifier.
In one embodiment of the present invention, the mimo system further includes the random signal for generating virtual signal data flow
The output end of generation module, the random signal generation module connects the input terminal of the signal modulator.
In one embodiment of the present invention, the signal modulator is quadrature amplitude modulator or quadrature phase shift keying tune
Device processed.
In one embodiment of the present invention, the pre-coding matrix used in the precoding module prelists for block diagonalization
Code matrix.
In one embodiment of the present invention, the multiple antennas receiving terminal includes：Reception antenna, the reception antenna are used for
Receive the transmitting signal that the transmitting terminal is sent；The input terminal of fourier transformation module, the fourier transformation module connects institute
The output end for stating reception antenna, suitable for carrying out Fourier transformation to the signal received；Detector, the input of the detector
End connects the output end of the fourier transformation module, and the signal suitable for being exported to the fourier transformation module is detected
Separation, to obtain the useful signal data flow and the virtual signal data flow；Demodulator of PM signal PM, the demodulator of PM signal PM
Input terminal connect the output end of the detector, suitable for being demodulated to the useful signal data flow.
As described above, the method and mimo system for reducing multiple antennas PAPR based on precoding of the present invention, uses for reference multi-user
Precoding technique eliminates the thought of inter-user interference in MIMO, regards virtual signal data flow as other users signal, by pre-
Coding techniques makes receiving terminal receive only useful signal.It has the advantages that：
1) in mimo systems, this method can reduce by the PAPR values of 1~2dB or so, effectively reduce system peak-to-average ratio, carry
Rise system performance；
2) compared to other reduction PAPR methods, do not change system structure, do not need receiving terminal overhead, save at
This.
Description of the drawings
Fig. 1 is that the present invention is based on precodings to reduce flow chart of the method for multiple antennas PAPR in embodiment one.
Fig. 2 is that the present invention is based on the CCDF that precoding reduces transmitting signal of the method for multiple antennas PAPR in embodiment one
Curve
Fig. 3 is that the present invention is based on the CCDF that precoding reduces transmitting signal of the method for multiple antennas PAPR in embodiment two
Curve
Fig. 4 is that the present invention is based on the transmitting terminals in the mimo system that precoding reduces multiple antennas PAPR in embodiment three
Structural schematic diagram.
Fig. 5 is that the present invention is based on the receiving terminals in the mimo system that precoding reduces multiple antennas PAPR in embodiment three
Structural schematic diagram.
Component label instructions
1 transmitting terminal
11 signal modulators
12 precoding modules
13 inverse Fourier transform modules
14 power amplifiers
15 transmission antennas
16 random signal generation modules
2 receiving terminals
21 reception antennas
22 fourier transformation modules
23 detectors
24 demodulator of PM signal PM
S1~S4 steps
Specific implementation mode
Illustrate that embodiments of the present invention, those skilled in the art can be by this specification below by way of specific specific example
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also be by addition different specific
Embodiment is embodied or practiced, and the various details in this specification can also be based on different viewpoints and application, not carry on the back
Various modifications or alterations are carried out under spirit from the present invention.It should be noted that in the absence of conflict, following embodiment and
Feature in embodiment can be combined with each other.
It should be noted that the diagram provided in following embodiment only illustrates the basic structure of the present invention in a schematic way
Think, though component count, shape and size when only display is with related component in the present invention rather than according to actual implementation in diagram
Draw, when actual implementation kenel, quantity and the ratio of each component can be a kind of random change, and its assembly layout kenel
It may also be increasingly complex.
Embodiment one
Referring to Fig. 1, the present invention provides a kind of method reducing multiple antennas PAPR based on precoding, it is suitable for multi-user
MIMO scenes and extensive MIMO scene, the method at least include the following steps：
Step 1), the N group virtual signal data flows that useful signal data stream is provided and is randomly generated, wherein N for more than etc.
In 2 positive integer；
Step 2) maps the N groups virtual signal data flow with the useful signal data flow by precoding respectively
Onto transmitting antenna, N groups transmitting signal in advance is obtained；
Step 3), to the N groups, transmitting signal carries out inverse fast Fourier transform in advance；
Step 4), every group of calculating emit the PAPR of signal, and make comparisons in advance, and the N groups is selected to emit PAPR in signal in advance
Minimum one group emits signal and is sent in advance.
As an example, transmitting terminal has L root transmitting antennas, receiving terminal to have N root reception antennas in setting mimo system.If S
(k)=[S1(k),S2(k),…,SM(k)]TFor useful signal data flow, V (k)=[V1(k),V2(k),…,VP(k)]TIt is virtual
Signal data stream, here, the virtual signal data flow V (k) can regard other users signal in multiuser MIMO as, for adjusting
The power peak of section transmitting signal.
As an example, in the step 1), pass through quadrature amplitude modulation or quadrature phase shift keyed modulation tune first
Make the useful signal data flow S (k) and the virtual signal data flow V (k).
It should be noted that in the step 2) of the present invention, precoding technique in multiuser MIMO is used for reference and has eliminated user
Between the thought interfered, regard virtual signal data flow as other users signal, inter-user interference eliminated by precoding technique,
So that receiving terminal receives only useful signal data flow.
Further include the power for normalizing each data flow in the step 2), obtains the power M of useful signal data flow
With the ratio of the power P of virtual signal data flow.
As an example, setting pre-coding matrix as Q (k), then it is X (k)=Q (k) [S (k), V (k)] to emit signalT.Described
In step 3), discrete Fourier transform (Discrete Fourier Transform, DFT) is realized respectively using FFT and IFFT
It is operated with inverse discrete Fourier transform (Inverse Discrete Fourier Transform, IDFT).Each group is virtually believed
One group of corresponding transmitting signal X (k) can be obtained in number stream, and IFFT operations are done to every group of transmitting signal.
It in the step 4), calculates every group and emits the PAPR of signal in advance, and make comparisons, select N groups transmitting letter in advance
PAPR is minimum in number one group emits signal and is sent in advance.
It needs to be explained further, the present invention eliminates shadow of the virtual signal data flow to receiving terminal by precoding technique
It rings, receiving terminal, which need not make any structure change, can receive useful signal, have while interference by virtual signal data flow
Effect reduces system PAPR values, improves the performance of system, wherein transmitting signal receives detection from transmission to receiving terminal
Process is described in detail below：
Known channel state information is H (k), and the channel between L roots transmitting antenna and receiving terminal N root reception antennas is rung
It answers, the channel state information being considered as between useful signal and receiving terminal.It is dry to be referred from processing multi-user in multiuser MIMO
The thought disturbed regards virtual data streams as other users signal that no receiving terminal receives, it is assumed that transmitting terminal to virtual receiving terminal
Channel state information be H2(k).Equivalent channels status information is at this timeBased on information above
Pre-coding matrix Q (k)=[Q is obtained using precoding technique1(k),Q2(k)], wherein Q1(k) it is the pre- of useful signal data flow
Encoder matrix, Q2(k) be virtual data streams pre-coding matrix.H (k) Q need to be met2(k)=H2(k)Q1(k)=0.Wherein, H2
(k) it can be fixed as some determination value, need not make change in a short time, thereby determine that Q1(k) constant can also be regarded as
It uses, can be used always after receiving terminal is known, not need overhead.Then the reception signal of receiving terminal is
Wherein, W (k) is expressed as white Gaussian noise, and useful signal data flow S (k) can be recovered by signal detection.
By analyzing above, increase additional virtual signal data flow in transmitting terminal, reduces transmitting signal power peak, connect
Receiving end can't receive the virtual data streams for influencing system performance.Do not increase receiving terminal expense to reach, reduces PAPR
Purpose.
Complementary Cumulative Distribution Function (Complementary Cumulative Distribution Function) be for
Indicate the introduced concept of the statistical property of the peak to average PAPR in ofdm system, it is defined as multicarrier transmission systems
Middle peak to average is more than the probability of a certain threshold value.Illustrate the effect of present invention reduction PAPR with CCDF curves below.
Transmitting terminal has L=6 root transmitting antennas, receiving terminal to have N=4 root reception antennas in setting mimo system.Useful signal
Data flow is M=4, virtual signal data flow P=1, then the power ratio of the power and virtual data streams of useful signal data flow
For
This example is modulated using QPSK (Quadrature Phase Shift Keyin, quadrature phase shift keying modulation) mode
Useful signal data flow and virtual signal data flow.Share the ofdm system modulate emission signal of 256 subcarriers.Known letter
Channel state information H (k) generates H at random2(k), using block diagonalization (Block Diagonalization, BD) precoding square
Battle array technology generates pre-coding matrix, eliminates the interference of virtual signal data flow.16 groups of differences are obtained by Monte Carlo method
Virtual signal data flow Vb(k),1≤b≤16.By 16 groups of different transmitting signal Xb(k) by IFFT modules, compare 16 groups
Emit the PAPR of signal, chooses wherein minimum conduct and emit signal.
Fig. 2 is to be for the power of useful signal data flow and the power ratio of virtual signal data flowThe case where
Under the curve graph of complementary cumulative distribution function CCDF that draws, wherein solid line be it is original not plus the transmitting of virtual signal data flow
The CCDF curves of signal, dotted line are the CCDF curves of the transmitting signal after the method using the present invention.It can be seen by Fig. 2
Go out, institute's extracting method of the present invention reduces the PAPR of 1dB or so.And in the case where receiving terminal does not increase any overhead,
It does not need transmitting terminal and sends additional relevant information yet.
Embodiment two
The embodiment is differed only in embodiment one, the power of useful signal data flow and the power of virtual data streams
Ratio isOther steps are consistent with embodiment one, and details are not described herein.
Fig. 3 is to be for the power of useful signal data flow and the power ratio of virtual signal data flowThe case where
Under the curve graph of complementary cumulative distribution function CCDF that draws, solid line be it is original not plus the transmitting signal of virtual signal data flow
CCDF curves, dotted line be use after the method for this patent transmitting signal CCDF curves.As seen in Figure 3, originally
Invention institute extracting method reduces the PAPR of 2dB or so.And in the case where receiving terminal does not increase any overhead, also not
Transmitting terminal is needed to send additional relevant information.
Embodiment three
The present invention also provides a kind of mimo system reducing multiple antennas PAPR based on precoding, the mimo system includes hair
Sending end 1 and receiving terminal 2, referring to Fig. 4, the transmitting terminal 1 includes at least：Signal modulator 11 receives the useful of different capacity
The virtual signal data flow of signal data stream and different capacity is suitable for using signal data stream and virtual signal data flow to described
It is modulated；Precoding module 12, the input terminal of the precoding module 12 connect the output end of the signal modulator 11,
If suitable for it is modulated it is described with signal data stream and virtual signal data flow carry out precoding to obtain intervening transmitting signal,
Wherein, the quantity of the pre- transmitting signal is consistent with the quantity of virtual signal data flow；Inverse Fourier transform module 13,
The input terminal of the inverse Fourier transform module 13 connects the output end of the precoding module 12, is suitable for respectively to each pre- hair
It penetrates signal and carries out inverse Fourier transform；The input terminal connection Fourier of power amplifier 14, the power amplifier 14 is inverse
The output end of conversion module 13 is suitable for carrying out power amplification to the output signal of the inverse Fourier transform module；Transmission antenna
15, the input terminal of the transmission antenna 15 connects the output end of the power amplifier 14, is suitable for the power amplifier
Output signal is transmitted wirelessly.
It should be noted that S (k)=[S1(k),S2(k),…,SM(k)]TFor useful signal data flow, V (k)=[V1
(k),V2(k),…,VP(k)]TFor virtual signal data flow, in Fig. 4, S1……SMCorresponding to S1(k),S2(k),…,SM
(k), wherein M refers to the M row kth row in S (k) matrixes；V1……VPCorresponding to V1(k),V2(k),…,VP(k), wherein P
Refer to the P row kth row in V (k) matrixes；X1……XLFor multigroup pre-sent signal after precoding；x1……xLFor
Multigroup pre-sent signal after inverse Fourier transform；y1……yLMost for the PAPR values chosen from multigroup pre-sent signal
One group of small pre-sent signal is as final transmission signal.
As an example, the mimo system further includes the random signal generation module 16 for generating virtual signal data flow, institute
The output end for stating random signal generation module 16 connects the input terminal of the signal modulator 11.
As an example, the signal modulator 11 is quadrature amplitude modulator or quadrature phase shift keyed modulators.
As an example, the pre-coding matrix used in the precoding module 12 is block diagonalization pre-coding matrix.
As an example, referring to Fig. 5, the multiple antennas receiving terminal 2 includes：Reception antenna 21, the reception antenna 21 are used
In the transmitting signal for receiving the transmission of transmitting terminal 1；Fourier transformation module 22, the input of the fourier transformation module 22
End connects the output end of the reception antenna 21, suitable for carrying out Fourier transformation to the signal received；Detector 23, it is described
The input terminal of detector 23 connects the output end of the fourier transformation module 22, is suitable for defeated to the fourier transformation module
The signal gone out is detected separation；The input terminal of demodulator of PM signal PM 24, the demodulator of PM signal PM 24 connects the detector 23
Output end, suitable for being demodulated from subcarrier to the useful signal data flow.
In Fig. 5, r1……rNFor the signal that receiving terminal 2 receives, R1……RNFor the signal after Fourier transformation,
S’1……S’MTo restore modulated signal by the useful signal data flow restored after signal detector 23, then by demodulator.
It for multiple antennas receiving terminal 2, does not make and changes in any structure, do not increase by 2 overhead of receiving terminal, you can with
Useful signal data flow is received, so, the mimo system of the invention that multiple antennas PAPR is reduced based on precoding is effectively reduced
System peak-to-average ratio, lifting system performance；Compared to the method for other reductions PAPR, do not change system structure, it is cost-effective.
In conclusion the method and mimo system for reducing multiple antennas PAPR based on precoding of the present invention, uses for reference multi-user
Precoding technique eliminates the thought of inter-user interference in MIMO, regards virtual signal data flow as other users signal, by pre-
Coding techniques makes receiving terminal receive only useful signal.In mimo systems, this method can reduce by the PAPR of 1~2dB or so
Value effectively reduces system peak-to-average ratio, lifting system performance；Compared to the method for other reductions PAPR, do not change system structure,
Receiving terminal overhead is not needed, it is cost-effective.So the present invention effectively overcomes various shortcoming in the prior art and has
High industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology can all carry out modifications and changes to above-described embodiment without violating the spirit and scope of the present invention.Cause
This, those of ordinary skill in the art institute without departing from the spirit and technical ideas disclosed in the present invention such as
All equivalent modifications completed or change should be covered by the claim of the present invention.
Claims (12)
1. a kind of method reducing multiple antennas PAPR based on precoding, which is characterized in that the method at least includes the following steps：
Step 1), the N group virtual signal data flows that useful signal data stream is provided and is randomly generated, wherein N is more than or equal to 2
Positive integer；
The N groups virtual signal data flow is mapped to hair by step 2) with the useful signal data flow by precoding respectively
It penetrates on antenna, obtains N groups transmitting signal in advance；
Step 3), to the N groups, transmitting signal carries out inverse fast Fourier transform in advance；
Step 4), every group of calculating emit the PAPR of signal, and make comparisons in advance, select the N groups to emit PAPR in signal in advance minimum
One group emit signal in advance and sent.
2. the method according to claim 1 for reducing multiple antennas PAPR based on precoding, which is characterized in that in the step
1) further include that the useful signal data flow and described is modulated by quadrature amplitude modulation or quadrature phase shift keyed modulation in
N group virtual signal data flows.
3. the method according to claim 2 for reducing multiple antennas PAPR based on precoding, which is characterized in that in the step
1) in, the N groups virtual signal data flow is randomly generated by Monte Carlo method.
4. the method according to claim 1 for reducing multiple antennas PAPR based on precoding, which is characterized in that in the step
2) in, further include the power of the power and the virtual signal data flow that normalize the useful signal data flow, obtain useful
The power of signal data stream and the power ratio of virtual data streams.
5. the method according to claim 1 for reducing multiple antennas PAPR based on precoding, which is characterized in that the precoding
The middle pre-coding matrix used is block diagonalization pre-coding matrix.
6. the method according to claim 5 for reducing multiple antennas PAPR based on precoding, which is characterized in that the precoding
Matrix meets condition：Q (k)=[Q1(k),Q2(k)], H (k) Q2(k)=H2(k)Q1(k)=0, wherein Q (k) is precoding square
Battle array, Q1(k) be useful signal data flow pre-coding matrix, Q2(k) be virtual signal data flow pre-coding matrix, H2(k) it is
For transmitting terminal to the channel state information of virtual receiving terminal, H (k) is known channel state information.
7. the method for reducing multiple antennas PAPR based on precoding according to any one of claim 1-6, which is characterized in that
It includes multiuser MIMO scene and extensive MIMO scene that the method for reducing multiple antennas PAPR based on precoding, which is applicable in scene,.
8. a kind of mimo system reducing multiple antennas PAPR based on precoding, the mimo system includes transmitting terminal and receiving terminal,
It is characterized in that, the transmitting terminal includes at least：
Signal modulator receives the useful signal data flow of different capacity and the virtual signal data flow of different capacity, be suitable for pair
It is described to be modulated with signal data stream and virtual signal data flow；
Precoding module, the input terminal of the precoding module connect the output end of the signal modulator, after being suitable for modulation
If described with signal data stream and virtual signal data flow carry out precoding to obtain intervening transmitting signal, wherein it is described pre-
The quantity for emitting signal is consistent with the quantity of virtual signal data flow；
The input terminal of inverse Fourier transform module, the inverse Fourier transform module connects the output end of the precoding module,
Suitable for carrying out inverse Fourier transform to each pre- transmitting signal respectively；
Power amplifier, the input terminal of the power amplifier connect the output end of the inverse Fourier transform module, be suitable for pair
The output signal of the inverse Fourier transform module carries out power amplification；
Transmission antenna, the input terminal of the transmission antenna connect the output end of the power amplifier, suitable for being put to the power
The output signal of big device is transmitted wirelessly.
9. the mimo system according to claim 8 for reducing multiple antennas PAPR based on precoding, which is characterized in that described
Mimo system further includes the random signal generation module for generating virtual signal data flow, the output of the random signal generation module
End connects the input terminal of the signal modulator.
10. the mimo system according to claim 8 for reducing multiple antennas PAPR based on precoding, which is characterized in that described
Signal modulator is quadrature amplitude modulator or quadrature phase shift keyed modulators.
11. the mimo system according to claim 8 for reducing multiple antennas PAPR based on precoding, which is characterized in that described
The pre-coding matrix used in precoding module is block diagonalization pre-coding matrix.
12. the mimo system according to claim 8 for reducing multiple antennas PAPR based on precoding, which is characterized in that described
Multiple antennas receiving terminal includes：
Reception antenna, the reception antenna are used to receive the transmitting signal that the transmitting terminal is sent；
Fourier transformation module, the input terminal of the fourier transformation module connect the output end of the reception antenna, be suitable for pair
The signal received carries out Fourier transformation；
Detector, the input terminal of the detector connect the output end of the fourier transformation module, are suitable for the Fourier
The signal of conversion module output is detected separation, to obtain the useful signal data flow and the virtual signal data flow；
Demodulator of PM signal PM, the input terminal of the demodulator of PM signal PM connect the output end of the detector, are suitable for the useful letter
Number stream is demodulated.
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