CN109067689A - The amplitude limit method of PART in a kind of F-OFDM communication system - Google Patents
The amplitude limit method of PART in a kind of F-OFDM communication system Download PDFInfo
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- CN109067689A CN109067689A CN201810875830.7A CN201810875830A CN109067689A CN 109067689 A CN109067689 A CN 109067689A CN 201810875830 A CN201810875830 A CN 201810875830A CN 109067689 A CN109067689 A CN 109067689A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2669—Details of algorithms characterised by the domain of operation
- H04L27/2671—Time domain
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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
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2676—Blind, i.e. without using known symbols
- H04L27/2678—Blind, i.e. without using known symbols using cyclostationarities, e.g. cyclic prefix or postfix
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Abstract
The invention discloses the amplitude limit method of PART in F-OFDM communication system a kind of, include the following steps: Step 1: carrying out multi-carrier modulation to input signal in transmitting terminal, and the IFFT for carrying out N point to input signal is converted, the time-domain signal after obtaining multi-carrier modulation；Step 2: the time-domain signal after the multi-carrier modulation obtained to step 1 adds cyclic prefix, complete OFDM time-domain signal is obtained；Step 3: being filtered to the complete OFDM time-domain signal that step 2 obtains, filtered signal is obtained；Step 4: carrying out the amplitude limiting processing of multi-threshold to the filtered signal that step 3 obtains；Information sequence after obtaining clipping；The amplitude limit method of PART in a kind of F-OFDM communication system disclosed by the invention, continue to set P-1 threshold value on the basis of original thresholding F0, computation complexity is low, distortion more smaller than traditional limiting technology, to compared with traditional clipping class technology, its influence to system performance is also relatively small.
Description
Technical field
The present invention relates to the clipping sides of PART in Multicarrier Transmission Technology field more particularly to F-OFDM communication system a kind of
Method.
Background technique
The development advanced by leaps and bounds with Internet technology, the higher speed of mobile Internet, it is more convenient, cheaper become people
The target of pursuit.Therefore the whole world is just gradually heating up for the research and development of the 5th third-generation mobile communication technology (5G).With 4G highest 100Mbps
Speed of surfing the Internet compare, 5G network can reach 1Gbps, more be able to satisfy requirement of the people to high transfer rate.Meanwhile the 5th generation shifting
Dynamic communication network also embodied in transmission process short time-delay, low-power consumption, it is highly reliable the features such as.Therefore the whole world is many national at present
5G research and development are all carried out, the global market 5G is just gradually opened.
Orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) belongs to 4G-
The Multicarrier Transmission Technology that LTE is used, due to ability and the good availability of frequency spectrum with stronger anti-multipath fading
It is widely used.However OFDM there are out-of-band radiations it is excessively high, peak-to-average force ratio is larger the disadvantages of,
The higher traffic rate of 5G and bandwidth demand are considered simultaneously, need to select higher time-frequency efficiency and more in practice
The Multicarrier Transmission Technology of excellent out-of-band radiation characteristic.F-OFDM is the novel multi-carrier transmission skill of one kind proposed in recent years
Art, main thought are filtered to ofdm signal, and out-of-band radiation can be effectively inhibited, to do between resisting different sub-band
It disturbs, reduce frequency band protection interval and further promotes the availability of frequency spectrum.Meanwhile the frame structure of F-OFDM is more flexible, intercarrier
Different configurations can be carried out according to channel condition, business demand every, various parameters such as cyclic prefix, filter coefficient, met
The diversity requirement of 5G.Based on the above advantage, F-OFDM has become one of the alternative of the new waveform technology of 5G, and obtains
Extensive research and discussion.
Since F-OFDM substantially still falls within a kind of Multicarrier Transmission Technology, also there is Multicarrier Transmission Technology institute
The biggish defect of shared peak-to-average force ratio.Excessively high PAPR can to send signal ingoing power amplifier nonlinearity region, thus
Generate distorted signals.Clipping class, coding class and this three big portion of scrambling code class are broadly divided into the Restrain measurement of OFDM both at home and abroad at present
Point.Coding class and scrambling code class technology belong to non-distortion technology, and calculating is substantially increased while ensuring that performance is unaffected
Complexity, therefore be rarely applied in real system；And traditional limiting technology is one thresholding F0 of setting, by the signal of transmission
The amplitude of sequence controls within thresholding, although this method is realized simply, will also result in biggish distorted signals, Jin Erying
The performance of acoustic system.
Summary of the invention
The distortion of signal is reduced while the technical problem to be solved by the present invention is to inhibit peak-to-average force ratio, and is further dropped
Influence of the low program to system performance, to solve the above-mentioned problems, the present invention provide PART in a kind of F-OFDM communication system
Amplitude limit method, include the following steps:
Step 1: carrying out multi-carrier modulation to input signal in transmitting terminal, and the IFFT for carrying out N point to input signal becomes
It changes, the time-domain signal after obtaining multi-carrier modulation；
Step 2: the time-domain signal after the multi-carrier modulation obtained to step 1 adds cyclic prefix, obtain complete
OFDM time-domain signal；
Step 3: being filtered to the complete OFDM time-domain signal that step 2 obtains, filtered signal is obtained；
Step 4: carrying out amplitude limiting processing to the filtered signal that step 3 obtains；Information sequence after obtaining clipping；
Wherein, amplitude limiting processing is as follows in step 4:
Set P threshold value: F0, F1,…,Fp-1；And them is made to meet F0<F1<…<Fp-1, filtering that step 3 is obtained
Signal carries out following section clipping afterwards:
Wherein, 1≤i≤4 ,-NgThe number of≤m≤N-1, i expression sequence group；M indicates son contained in each sequence group
Variable number；NgIndicate the length of cyclic prefix；N is the sub-carrier number of ofdm communication system, xi" (m) indicates the information after clipping
Sequence；xi' (m) indicates filtered signal；|xi' (m) | indicate the amplitude of filtered signal；Indicate the phase of filtered signal.
Further, step 1 includes: to carry out serioparallel exchange to input signal in transmitting terminal, sends the different N idea of l group
Band sequence group Xi(k)=[Xi(0),Xi(1),…,Xi(N-2),Xi(N-1)]T, 1≤i≤l, 0≤k≤N-1, N are ofdm communication
The sub-carrier number of system.
Further, step 1 includes: as l=4, and the IFFT for carrying out N point to input signal is converted, and obtains multicarrier tune
Time-domain signal after system is xi(n):
Wherein, 1≤i≤4,0≤n≤N-1.
Further, it is x that complete OFDM time-domain signal is obtained in step 2i(m):
xi(m)=[xi(-Ng),xi(-Ng+1),…,xi(-1),xi(0),xi(1),…,xi(N-2),xi(N-1)]T
Wherein the length of cyclic prefix is Ng。
Further, step 3 includes: by xi(m) pass through sub-filter fi(m) it is filtered, obtains xi' (m),
xi' (m)=xi(m)*fi(m)=[xi′(-Ng),xi′(-Ng+1),…,xi′(-1),xi′(0),xi′(1),…,xi′
(N-2),xi′(N-1)]T
Wherein, 1≤i≤4 ,-Ng≤ m≤N-1, fiIt (m) is the impulse response of the filter of subband i.
Further, further include following steps:
Step 5: the information sequence after the clipping that step 4 is obtained carries out bit-wise addition, synthesizes new sequence group；
Step 6: the new sequence group that step 5 obtains encounters frequency deviation and noise in actual wireless channel transmission process
Influence, obtain y " (m) ,-N in receiving endg≤ m≤N-1:
Wherein, ε is frequency deviation, the additive Gaussian white noise that w (m) encounters when being propagated in actual wireless channel by x " (m)
Sound；
Step 7: to y obtained in step 6, " (m) restores for receiving end.
Further, step 7 includes:
S1: by y " (m) passes through corresponding matched filter fi *(- m) correctly restores the sequence group data in subband i
Out, y is obtainedi" ' (m), 1≤i≤4 ,-Ng≤ m≤N-1:
yi" ' (m)=y " (m) * fi *(-m)
=[yi″′(-Ng),yi″′(-Ng+1),…,yi″′(-1),yi″′(0),yi″′(1),…,yi″′(N-2),
yi″′(N-1)]T；
S2: by yi" ' (m) carries out cyclic prefix, obtains yi" ' (n), 1≤i≤4,0≤n≤N-1 ,-Ng≤ m≤N-1:
yi" ' (n)=[yi″′(0),yi″′(1),…,yi″′(N-2),yi″′(N-1)]T；
S3: by yi" ' (n) carries out the FFT transform of N point, obtains Yi" ' (k):
Wherein, 1≤i≤4,0≤n≤N-1.
The invention has the following beneficial effects:
The amplitude limit method of PART in a kind of F-OFDM communication system disclosed by the invention, on the basis of traditional limiting technology
A kind of section limiting technology is proposed, i.e., in original thresholding F0On the basis of continue set p-1 threshold value, computation complexity
It is low, distortion more smaller than traditional limiting technology, thus compared with traditional clipping class technology, its influence to system performance also phase
To smaller.
Detailed description of the invention
Fig. 1 is the subcarrier sequence group X that 4 sequencers that the embodiment of the present invention provides issuei(k)(1≤i≤
4,0≤k≤N-1) structure chart；
Fig. 2 is provided in an embodiment of the present invention by xi′(m)(1≤i≤4,-Ng≤ m≤N-1) by obtaining after step 4
The subcarrier sequence group x arrivedi" the structure chart of (m)；
Fig. 3 is " (m) (- N provided in an embodiment of the present invention by xg≤ m≤N-1) it is carried by the son after step 6, obtained
The structure chart of wave train group y " (m)；
Fig. 4 is the work flow diagram of the amplitude limit method of PART in a kind of F-OFDM communication system disclosed by the invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and referring to data.It should be understood that embodiment is intended merely to lift
Example illustrates the present invention, rather than limits the range of invention in any way.
As shown in figure 4, the present invention provides the amplitude limit method of PART in F-OFDM communication system a kind of, include the following steps:
Step 1: carrying out multi-carrier modulation to input signal in transmitting terminal, and the IFFT for carrying out N point to input signal becomes
It changes, the time-domain signal after obtaining multi-carrier modulation；
Step 2: the time-domain signal after the multi-carrier modulation obtained to step 1 adds cyclic prefix, obtain complete
OFDM time-domain signal；
Step 3: being filtered to the complete OFDM time-domain signal that step 2 obtains, filtered signal is obtained；
Step 4: carrying out amplitude limiting processing to the filtered signal that step 3 obtains；Information sequence after obtaining clipping；
Wherein, amplitude limiting processing is as follows in step 4:
Set P threshold value: F0, F1,…,Fp-1；And them is made to meet F0<F1<…<Fp-1, filtering that step 3 is obtained
Signal carries out following section clipping afterwards:
Take into account scheme peak-to-average force ratio inhibitory effect and thus brought by distorted signals, preferably P=3.
Wherein, 1≤i≤4 ,-NgThe number of≤m≤N-1, i expression sequence group；M indicates son contained in each sequence group
Variable number；NgIndicate the length of cyclic prefix；N is the sub-carrier number of ofdm communication system, xi" (m) indicates the information after clipping
Sequence；xi' (m) indicates filtered signal；|xi' (m) | indicate the amplitude of filtered signal；Indicate the phase of filtered signal.
Step 5: the information sequence after the clipping that step 4 is obtained carries out bit-wise addition, synthesizes new sequence group；
Step 6: the new sequence group that step 5 obtains encounters frequency deviation and noise in actual wireless channel transmission process
Influence, obtaining y in receiving end, " (m), structure is as shown in figure 3 ,-Ng≤ m≤N-1:
Wherein, ε is frequency deviation, the additive Gaussian white noise that w (m) encounters when being propagated in actual wireless channel by x " (m)
Sound (Additive White Gaussian Noise, AWGN)；
Step 7: to y obtained in step 6, " (m) restores for receiving end.
In a preferred embodiment, in step 1, serioparallel exchange is carried out to input signal in transmitting terminal, sends l group
Different N point subband sequence group Xi(k)=[Xi(0),Xi(1),…,Xi(N-2),Xi(N-1)]T, l=4,1≤i≤l, 0≤k≤
N-1, N are the sub-carrier number of ofdm communication system.
The IFFT transformation of N point is carried out to input signal, the time-domain signal after obtaining multi-carrier modulation is xi(n), structure
As shown in Figure 1:
Wherein, 1≤i≤4,0≤n≤N-1.
To x in step 2i(n) left end is N plus lengthgCyclic prefix (Cyclic Prefix, CP), obtained
Whole OFDM time-domain signal is xi(m):
xi(m)=[xi(-Ng),xi(-Ng+1),…,xi(-1),xi(0),xi(1),…,xi(N-2),xi(N-1)]T, 1≤i
≤ 4 ,-Ng≤m≤N-1；
Wherein the length of cyclic prefix is Ng。
In step 3, by xi(m) pass through sub-filter fi(m) it is filtered, i.e., to xi(m) and fi(m) it carries out
Convolution obtains xi' (m),
xi' (m)=xi(m)*fi(m)=[xi′(-Ng),xi′(-Ng+1),…,xi′(-1),xi′(0),xi′(1),…,xi′
(N-2),xi′(N-1)]T, wherein 1≤i≤4 ,-Ng≤ m≤N-1, fiIt (m) is the impulse response of the filter of subband i.
In step 5, to xi" (m) carries out bit-wise addition, obtains x " (m), structure is as shown in Figure 2:
Further include following steps in step 7:
S1: by y " (m) passes through corresponding matched filter fi *(- m), " (m) and the f to yi *(- m) carries out convolution, will be sub
It is correctly recovered with the sequence group data in i, obtains yi" ' (m), 1≤i≤4 ,-Ng≤ m≤N-1:
yi" ' (m)=y " (m) * fi *(-m)
=[yi″′(-Ng),yi″′(-Ng+1),…,yi″′(-1),yi″′(0),yi″′(1),…,yi″′(N-2),yi″′
(N-1)]T；
S2: by yi" ' (m) carries out cyclic prefix, obtains yi" ' (n), 1≤i≤4,0≤n≤N-1 ,-Ng≤ m≤N-1:
yi" ' (n)=[yi″′(0),yi″′(1),…,yi″′(N-2),yi″′(N-1)]T；
S3: by yi" ' (n) carries out the FFT transform of N point, obtains Yi" ' (k):
Wherein, 1≤i≤4,0≤k≤N-1.
It is not difficult to find that transmitting terminal is to xiWhen ' (m) is using section limiting technology proposed by the present invention, amount distortion are as follows:
Meanwhile if to xiWhen ' (m) is using traditional limiting technology, amount distortion are as follows:
Apparent Δ1< Δ2, therefore distortion more smaller than traditional limiting technology will be obtained using section limiting technology, from
And compared with traditional clipping class technology, its influence to system performance is also relatively small.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be within the scope of protection determined by the claims.
Claims (7)
1. the amplitude limit method of PART in a kind of F-OFDM communication system, which comprises the steps of:
Step 1: carrying out multi-carrier modulation to input signal in transmitting terminal, and the IFFT for carrying out N point to input signal is converted, and is obtained
Time-domain signal after to multi-carrier modulation；
Step 2: the time-domain signal after the multi-carrier modulation obtained to step 1 adds cyclic prefix, when obtaining complete OFDM
Domain signal；
Step 3: being filtered to the complete OFDM time-domain signal that step 2 obtains, filtered signal is obtained；
Step 4: carrying out amplitude limiting processing to the filtered signal that step 3 obtains；Information sequence after obtaining clipping；
Wherein, amplitude limiting processing is as follows in the step 4:
Set P threshold value: F0, F1,…,Fp-1；And them is made to meet F0<F1<…<Fp-1, believe after the filtering obtained to step 3
Number carry out following section clipping:
Wherein, 1≤i≤4 ,-NgThe number of≤m≤N-1, i expression sequence group；M indicates subcarrier contained in each sequence group
Number；NgIndicate the length of cyclic prefix；N is the sub-carrier number of ofdm communication system, xi" (m) indicates the information sequence after clipping；
xi' (m) indicates filtered signal；|xi' (m) | indicate the amplitude of filtered signal；Indicate the phase of filtered signal.
2. the amplitude limit method of PART in a kind of F-OFDM communication system as described in claim 1, which is characterized in that the step
One includes: to carry out serioparallel exchange to input signal in transmitting terminal, sends the different N point subband sequence group X of l groupi(k)=[Xi(0),
Xi(1),…,Xi(N-2),Xi(N-1)]T, 1≤i≤l, 0≤k≤N-1, N are the sub-carrier number of ofdm communication system.
3. the amplitude limit method of PART in a kind of F-OFDM communication system as claimed in claim 2, which is characterized in that the step
One includes: as l=4, and the IFFT for carrying out N point to input signal is converted, and the time-domain signal after obtaining multi-carrier modulation is xi
(n):
Wherein, 1≤i≤4,0≤n≤N-1.
4. the amplitude limit method of PART in a kind of F-OFDM communication system as claimed in claim 3, which is characterized in that the step
It is x that complete OFDM time-domain signal is obtained in twoi(m):
xi(m)=[xi(-Ng),xi(-Ng+1),…,xi(-1),xi(0),xi(1),…,xi(N-2),xi(N-1)]T
Wherein the length of cyclic prefix is Ng。
5. the amplitude limit method of PART in a kind of F-OFDM communication system as claimed in claim 4, which is characterized in that the step
Three include: by xi(m) pass through sub-filter fi(m) it is filtered, obtains xi' (m),
xi' (m)=xi(m)*fi(m)=[xi′(-Ng),xi′(-Ng+1),…,xi′(-1),xi′(0),xi′(1),…,xi′(N-
2),xi′(N-1)]T
Wherein, 1≤i≤4 ,-Ng≤ m≤N-1, fiIt (m) is the impulse response of the filter of subband i.
6. the amplitude limit method of PART in a kind of F-OFDM communication system as described in claim 1, which is characterized in that further include as
Lower step:
Step 5: the information sequence after the clipping that step 4 is obtained carries out bit-wise addition, synthesizes new sequence group；
Step 6: the new sequence group that step 5 obtains encounters the shadow of frequency deviation and noise in actual wireless channel transmission process
It rings, obtains y " (m) ,-N in receiving endg≤ m≤N-1:
Wherein, ε is frequency deviation, the additive white Gaussian noise that w (m) encounters when being propagated in actual wireless channel by x " (m)；
Step 7: to y obtained in step 6, " (m) restores for receiving end.
7. the amplitude limit method of PART in a kind of F-OFDM communication system as claimed in claim 6, which is characterized in that the step
Seven include:
S1: by y " (m) passes through corresponding matched filter fi *(- m) correctly recovers the sequence group data in subband i,
Obtain yi" ' (m), 1≤i≤4 ,-Ng≤ m≤N-1:
yi" ' (m)=y " (m) * fi *(-m)
=[yi″′(-Ng),yi″′(-Ng+1),…,yi″′(-1),yi″′(0),yi″′(1),…,yi″′(N-2),yi″′
(N-1)]T；
S2: by yi" ' (m) carries out cyclic prefix, obtains yi" ' (n), 1≤i≤4,0≤n≤N-1 ,-Ng≤ m≤N-1:
yi" ' (n)=[yi″′(0),yi″′(1),…,yi″′(N-2),yi″′(N-1)]T；
S3: by yi" ' (n) carries out the FFT transform of N point, obtains Yi" ' (k):
Wherein, 1≤i≤4,0≤k≤N-1.
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