CN109120569A - A kind of reduction PAPR method based on signal restoring in F-OFDM system - Google Patents
A kind of reduction PAPR method based on signal restoring in F-OFDM system Download PDFInfo
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- CN109120569A CN109120569A CN201811192252.3A CN201811192252A CN109120569A CN 109120569 A CN109120569 A CN 109120569A CN 201811192252 A CN201811192252 A CN 201811192252A CN 109120569 A CN109120569 A CN 109120569A
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
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Abstract
The invention discloses the reduction PAPR methods based on signal restoring a kind of in F-OFDM system.This method restores not sent signal by constructing the method recovery algorithms of sub-block in receiving end in the signal of signal transmitting terminal not transmission power extreme higher position.This method can be used together in transmitting terminal with other reduction PAPR methods, reached and preferably inhibited PAPR effect.Simultaneously by emulation experiment, the signal error rate after recovery is not improved.
Description
Technical field
The present invention relates to mobile communication fields, more particularly to the reduction based on signal restoring in a kind of F-OFDM system
PAPR method.
Background technique
F-OFDM is that the featured 5G of Huawei Company technology of eating dishes without rice or wine exists high because the technology is derived from OFDM technology
The problem of papr (PAPR).High PAPR can make signal by non-linear equipment, as occurred when high power amplifier
In order to solve the problems, such as the high PAPR of F-OFDM signal the technology that PAPR is reduced in ofdm system can be used, such as in non-linear distortion
Document " H.Ochiai and H.Imai, " Performance of the deliberate clipping with
adaptive symbol selection for strictly band-limited OFDM systems,”IEEE
J.Sel.Areas Commun., vol.18, no.11, pp.2270-2277, Nov.2000. " they are a kind of waveform tailoring technologies, but
There are problems that distorted signals, such as document " Cho Y J, Kim K H, Woo J Y, et al.Low-Complexity PTS
Schemes Using Dominant Time-Domain Samples in OFDM Systems[J].IEEE
Transactions on Broadcasting, 2017,63 (2): 440-445. " is a kind of improvement side of partial sequence transmission
Method, this method not will lead to distorted signals, but there is a problem of reducing PAPR effect difference.This patent proposes a kind of based on signal
The reduction PAPR method of recovery, this method pass through structure in receiving end in the signal of signal transmitting terminal not transmission power extreme higher position
The method recovery algorithms for making sub-block restore not sent signal.This method can be in transmitting terminal together with other reduction PAPR methods
It uses, reaches and preferably inhibit PAPR effect.Simultaneously by emulation experiment, the signal error rate after recovery is not improved.
Summary of the invention
In order to preferably reduce PAPR effect, the present invention proposes a kind of new partial transmission sequence (PTS) method.The present invention
Innovation be to propose a kind of receiving end construction sub-block recovery deleted signal method, this method utilizes incomplete signal
After FFT, deleted signal is restored in the regularity of modulation point distribution.
Innovation of the invention is the case where being greater than 1 for deleted signal quantity, constructs new sub-block, makes every height
A deleted signal is contained only in block, and restores simultaneously demodulated signal after capable of individually carrying out FFT.
The present invention relates to a kind of reduction PAPR methods in F-OFDM system based on signal restoring, it is characterised in that including with
Lower step:
According to bit stream, baseband modulation obtains mapping signal for step 1, binary load, by serioparallel exchange, quick Fu
The time domain OFDM signal sequence x that length is L is obtained after leaf inverse transformation；
Step 2 determines default parameters N, and N is the integer greater than 0, calculates time-domain signal sequence x each position amplitude, in x it is N number of most
High-amplitude value signal removes, and obtains peak-to-peak signal, tracer signal deletion sites are fed together transmitting antenna after adding cyclic prefix to filter again；
Step 3 goes peak-to-peak signal filtering to go after cyclic prefix to obtain time-domain signal x again to what is receivedR, in signal deletion position
It sets and fills out xRThe highest signal of amplitude, is recorded as initial predicted value PrxR=a+bi；
If step 4, N=1, skip following steps, to xRAdjacent segmentation is carried out, is partitioned into V sub-block of equal length, really
Protect x of each deleted signal not in the same segmentation sub-block, after segmentationRFor V row, the matrix of L/V column；
If step 5, N=1, skip following steps, the orthogonal matrix A of V row V column is constructed according to formula (1),
Transformation signal Tx is obtained according to formula (2)R,
TxR=A-1xR (2)
According to formula (3) construction size and TxRIdentical phase compensation matrix P,
STxR=TxR°Pm,n (4)
Separation signal STx is obtained according to formula (4)R, wherein ° expression Hadamard product (Hadamard product)；
If step 6, N=1, step 7 is executed, if N > 1, executes step 8；
Step 7, xRThe average distance D of the nearest modulation point of all signal distances is calculated after FFT, records predicted value again
RpxR=a+ (b+D) i inserts xRThe position of middle deleted signal calculates the average distance D1 of each signal and modulation point after FFT, according to
Formula (5) updates RpxR, and the average distance D2 of each signal and modulation point after FFT is calculated,
Correction predicted value Cpx is calculated according to formula (6)R, insert xRThe position of middle deleted signal, to xRBase band after progress FFT
Demodulation, obtains binary data bits stream；
If step 8, N > 1, STx is detectedRLine n in whether there is deleted signal, then make x if it existsREqual to the line number
According to executing step 7, if it does not exist then base band demodulating after direct FFT, obtain binary data bits stream, n=n+1 is repeated V times.
The beneficial effects of the present invention are this method to concentrate on receiving end, so other reductions can be used simultaneously in transmitting terminal
The method of PAPR further decreases the PAPR of system, is particularly suitable for the higher multi-carrier modulation technology of new generation of PAPR.And it is logical
It crosses emulation and illustrates that this method will not be such that the bit error rate substantially increases, frequency band will not be caused to leak.
1 simulation parameter of table
| F-OFDM symbolic number | 20000 |
| FFT length | 1024 |
| Resource block | 50 |
| Resource block subcarrier | 12 |
| Circulating prefix-length | 72 |
| Constellation modulation | 16QAM |
| Filter order | 512 |
| Filter function | sinc |
| PTS divides sub-block | 4 |
| Rotatable phase number | 4 |
Detailed description of the invention
Fig. 1 is the flow chart of reduction PAPR method of the F-OFDM system based on signal restoring.
Fig. 2 is the peak-to-average power ratio emulation to F-OFDM system, and simulated conditions are as shown in table 1.It include removing peak-to-peak signal in figure
With traditional PTS (C-PTS), the PAPR of LC-PTS, PC-PTS and original signal is compared.Wherein go the transmitting terminal of peak-to-peak signal using biography
The PTS that unites is handled, and peak parameter N is gone to take 1,2 and 4 respectively.Emulation display, it is identical that LC-PTS with PC-PTS can reach C-PTS
Inhibit PAPR effect, takes 10 in CCDF-4When, PAPR0For 10.08dB.In contrast, peak-to-peak signal (N=1) is gone to take 10 in CCDF-4
When, PAPR0For 9.35dB.Peak-to-peak signal (N=2) is gone to take 10 in CCDF-4When, PAPR0For 9.16dB.Peak-to-peak signal (N=1) is gone to exist
CCDF takes 10-4When, PAPR0For 8.96dB.PAPR inhibitory effect improves 7.2%, 9.12%, 11.1% respectively.
LC-PTS is by " Cho Y J, Kim K H, Woo J Y, et al.Low-Complexity PTS Schemes
Using Dominant Time-Domain Samples in OFDM Systems[J].Ieee Transactions on
Broadcasting, 2017,63 (2): 440-445. " is proposed.
PC-PTS is by " Lee K S, Cho Y J, Woo J Y, et al.Low-complexity PTS schemes
using OFDM signal rotation and pre-exclusion of phase rotating vectors[J].IET
Communications, 2016,10 (5): 540-547. " is proposed.
Fig. 3 is that different parameters go the power spectrum of peak-to-peak signal and original signal to emulate, and simulated conditions are as shown in table 1.By emulating
As a result it will lead to apparent out-of-band radiation as can be seen that removing peak-to-peak signal not.
Fig. 4 is that the bit error rate for removing peak-to-peak signal of different parameters emulates, and simulated conditions are as shown in table 1.Emulation display,
Under QPSK modulation, peak-to-peak signal and original signal is gone to reach 10 when signal-to-noise ratio is 5.93dB-3Bit error rate.It is modulated in 16QAM
Under, it removes peak-to-peak signal (N=1) and peak-to-peak signal (N=2) is gone to reach 10 when signal-to-noise ratio is 12.72dB-3Bit error rate.Peak is gone to believe
Number (N=1) then reaches 10 when signal-to-noise ratio is 13.46dB-3Bit error rate.Under 64QAM modulation, original signal is in signal-to-noise ratio
18.56dB when reach 10-3Bit error rate.When peak-to-peak signal N being gone to take 1,2 and 4 respectively, required signal-to-noise ratio is improved compared to original signal
0.72dB, 1.38dB and 4.78dB.64QAM modulation is removed, peak-to-peak signal (N≤4) is gone hardly to promote bit error rate.?
Under 64QAM modulation, the bit error rate of peak-to-peak signal (N≤2) is gone also to reach the level of receiving.
Specific embodiment
2 simulation parameter of table
Specific implementation method of the technical solution of the present invention under the setting of table 2, the method detailed process packet is given below
Include following steps:
According to bit stream, baseband modulation obtains mapping signal for step 1, binary load, by serioparallel exchange, quick Fu
The time domain OFDM signal sequence x that length is 1024 is obtained after leaf inverse transformation；
Step 2 determines that default parameters are 3, calculates time-domain signal sequence x each position amplitude, 3 highest amplitude letters in x
Number remove, obtain peak-to-peak signal, tracer signal deletion sites are fed together transmitting antenna after filtering；
Step 3 goes peak-to-peak signal filtering to go after cyclic prefix to obtain time-domain signal x again to what is receivedR, in signal deletion position
It sets and fills out xRThe highest signal of amplitude, is recorded as initial predicted value PrxR=a+bi,
Step 4, to xRAdjacent segmentation is carried out, is partitioned into V sub-block of equal length, it is ensured that each deleted signal is not same
In a segmentation sub-block, the x after segmentationRFor V row, the matrix of 1024/V column；
If step 5, N=1, skip following steps, the orthogonal matrix A of V row V column is constructed according to formula (1),
Transformation signal Tx is obtained according to formula (2)R,
TxR=A-1xR (2)
According to formula (3) construction size and TxRIdentical phase compensation matrix P,
STxR=TxR°Pm,n (4)
Separation signal STx is obtained according to formula (4)R, wherein ° expression Hadamard product (Hadamard product)；
Step 6, detection STxRLine n in whether there is deleted signal, then make x if it existsREqual to the row data, execute
Step 7, then base band demodulating after direct FFT if it does not exist, obtains binary data bits stream, n=n+1 is repeated V times.
Step 7, xRThe average distance D of the nearest modulation point of all signal distances is calculated after FFT, records predicted value again
RpxR=a+ (b+D) i inserts xRThe position of middle deleted signal calculates the average distance D1 of each signal and modulation point after FFT, according to
Formula (5) updates RpxR, and the average distance D2 of each signal and modulation point after FFT is calculated,
Correction predicted value Cpx is calculated according to formula (6)R, insert xRThe position of middle deleted signal, to xRBase band after progress FFT
Demodulation, obtains binary data bits stream.
Claims (1)
1. the present invention relates to a kind of reduction PAPR methods in F-OFDM system based on signal restoring, it is characterised in that including following
Step:
According to bit stream, baseband modulation obtains mapping signal for step 1, binary load, inverse by serioparallel exchange, fast Fourier
The time domain OFDM signal sequence x that length is L is obtained after transformation；
Step 2 determines default parameters N, and N is the integer greater than 0, calculates time-domain signal sequence x each position amplitude, in x it is N number of most
High-amplitude value signal removes, and obtains peak-to-peak signal, tracer signal deletion sites are fed together transmitting day after adding cyclic prefix to filter again
Line；
Step 3 goes peak-to-peak signal filtering to go after cyclic prefix to obtain time-domain signal x again to what is receivedR, filled out in signal deletion position
Upper xRThe highest signal of amplitude, is recorded as initial predicted value PrxR=a+bi；
If step 4, N=1, skip following steps, to xRAdjacent segmentation is carried out, V sub-block of equal length is partitioned into, it is ensured that is each
The deleted signal not x in the same segmentation sub-block, after segmentationRFor V row, the matrix of L/V column；
If step 5, N=1, skip following steps, the orthogonal matrix A of V row V column is constructed according to formula (1),
Transformation signal Tx is obtained according to formula (2)R,
TxR=A-1xR (2)
According to formula (3) construction size and TxRIdentical phase compensation matrix P,
Separation signal STx is obtained according to formula (4)R, whereinIndicate Hadamard product (Hadamard product)；
If step 6, N=1, step 7 is executed, if N > 1, executes step 8；
Step 7, xRThe average distance D of the nearest modulation point of all signal distances is calculated after FFT, records predicted value Rpx againR
=a+ (b+D) i inserts xRThe position of middle deleted signal calculates the average distance D1 of each signal and modulation point after FFT, according to formula
(5) Rpx is updatedR, and the average distance D2 of each signal and modulation point after FFT is calculated,
Correction predicted value Cpx is calculated according to formula (6)R, insert xRThe position of middle deleted signal, to xRBase band solution after progress FFT
It adjusts, obtains binary data bits stream；
If step 8, N > 1, STx is detectedRLine n in whether there is deleted signal, then make x if it existsREqual to the row data, hold
Row step 7, then base band demodulating after direct FFT, obtains binary data bits stream if it does not exist, and n=n+1 is repeated V times.
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Citations (6)
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| CN101087284A (en) * | 2006-06-09 | 2007-12-12 | 罗仁泽 | A joint method for reducing OFDM signal peak flat ratio |
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| CN104022994A (en) * | 2014-06-16 | 2014-09-03 | 电子科技大学 | PTS method for lowering PAPR of MIMO-OFDM system |
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| EP3086523A1 (en) * | 2015-04-23 | 2016-10-26 | Alcatel Lucent | Apparatus, sub-carrier module, transmitter module, method and computer program for providing an output signal for a filter module |
| CN106330809A (en) * | 2016-10-27 | 2017-01-11 | 天津理工大学 | Method for restraining PAPR of optical OFDM system based on FHT and improved Mu law companding transform |
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Patent Citations (6)
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| CN101087284A (en) * | 2006-06-09 | 2007-12-12 | 罗仁泽 | A joint method for reducing OFDM signal peak flat ratio |
| CN103248602A (en) * | 2013-05-23 | 2013-08-14 | 西南石油大学 | SLM (selected mapping) method for decreasing peak-to-average power ratio of OFDM (Orthogonal Frequency Division Multiplexing) signals on the basis of linear block coding |
| CN104022994A (en) * | 2014-06-16 | 2014-09-03 | 电子科技大学 | PTS method for lowering PAPR of MIMO-OFDM system |
| EP3086523A1 (en) * | 2015-04-23 | 2016-10-26 | Alcatel Lucent | Apparatus, sub-carrier module, transmitter module, method and computer program for providing an output signal for a filter module |
| CN105141565A (en) * | 2015-08-19 | 2015-12-09 | 电子科技大学 | Block SLM (Selected Mapping) method for reducing PAPR (Peak-to-Average Power Ratio) of OFDM (Orthogonal Frequency Division Multiplexing) signal |
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| EONPYO HONG, DONGSOO HAR: "Adaptive All-Pass Filter Achieving Low Peak-to-Average Power Ratio for OFDM Systems", 《 IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY ( VOLUME: 60 , ISSUE: 8 , OCT. 2011 )》 * |
| 季策，祝雯靖，魏颖，贾佃霞: "降低OFDM***PAPR的改进SLM算法", 《通信学报》 * |
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