CN106330809A - Method for restraining PAPR of optical OFDM system based on FHT and improved Mu law companding transform - Google Patents
Method for restraining PAPR of optical OFDM system based on FHT and improved Mu law companding transform Download PDFInfo
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- CN106330809A CN106330809A CN201610969284.4A CN201610969284A CN106330809A CN 106330809 A CN106330809 A CN 106330809A CN 201610969284 A CN201610969284 A CN 201610969284A CN 106330809 A CN106330809 A CN 106330809A
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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
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
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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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Abstract
The invention discloses a method for restraining PAPR of optical OFDM system based on FHT and improved Mu law companding transform to firstly improve the traditional Hadamard transform and Mu law companding transform and then perform the cascade connection. The computation complexity of fast Hadamard transform is much lower than Hadamard transform and the improved Mu law companding transform may undertake joint optimization for peak-to-average ratio performance and error rate performance, control the single BER performance while reducing single PAPR and eliminate the band spectrum regeneration resulting from signal distortion in the course of repetition. After the fast Hadamard transform for single is completed, the PAPR of single reduces a little. While the companding transform is performed for the single, the predistortion of single will not be too serious. Thus, when undertaking the inverse transformation in the receiving end, the single will be recovered better. The PAPR performance after using the provided method is better than the performance after separately adopting one of methods and the comprehensive performance is superior to traditional SLM and PTS.
Description
Technical field
The invention belongs to fiber optic communication and signal processing technology field, particularly relate to optical OFDM system and reduce PAPR.
Background technology
Light OFDM (OOFDM) becomes in recent years with the advantage of its uniqueness as a kind of novel multi-carrier modulation technology
One of study hotspot carrying out optical communication field, especially coherent light OFDM (CO-OFDM) system, spectrum efficiency,
The superiority embodied in receiver sensitivity and resisting chromatic dispersion so that it is become and realize two-forty, Large Copacity, remote light future
The important solutions of fiber communication.Papr (PAPR) is higher is one of the major defect of OOFDM system, high PAPR
Not only can increase system complexity, improve system cost, also can affect the non-linear of optical fiber.At present, many sides reducing PAPR
Method has been suggested, such as margining amplitude technique, companding transform method, Choose for user method (SLM), partial transmission sequence method (PTS), unitary transformation
Method etc..
It is autocorrelation aperiodic by reducing signal that unitary transformation method reduces the reason of signal PAPR.In unitary transformation method,
Hadamard (Hadamard) transformation matrix, discrete cosine transform (DCT) matrix are conventional unitary transformation matrix.Mu-law companding converts
Being transformed by the mu-law companding thought of voice signal, expand small amplitude signal, significantly signal is compressed.Also have
Many researchs combined about unitary transformation method and companding transform method.Such as: Hadamard conversion combines mu-law companding conversion, DCT
Conversion combines mu-law companding conversion etc..
Summary of the invention
It is an object of the invention to use fast hadamard transform (FHT) to combine the mu-law companding conversion improved come CO-OFDM
System PAPR and the bit error rate (BER) performance carry out combined optimization, finally realize PAPR performance, computation complexity and bit error rate performance
Compromise.Being after signal maps, first carry out FHT computing, FHT computing is used to change autocorrelation aperiodic of mapping signal
And reducing CO-OFDM signal PAPR, algorithm complex is low simultaneously.The mu-law companding again signal improved after IFFT computing
Conversion, reduces the PAPR of CO-OFDM signal further, and the mu-law companding conversion of improvement is a process repeating companding filtering.?
CO-OFDM system receiving terminal carries out companding inverse transformation and FHT inverse transformation respectively, recovers CO-OFDM signal.
The technical scheme is that
The method of mu-law companding based on FHT and improvement conversion suppression optical OFDM system PAPR, by radio frequency OFDM transmitter
The module process to baseband signal；Utilize I/Q modulator that the signal of telecommunication is changed into optical signal by radio frequency to light up converter；Warp
Cross the light ofdm signal of optical fiber link transmission, utilize coherent detection technology to realize optical signal to electricity in light to radio-frequency down-conversion device
The transformation of signal；By radio frequency OFDM receiver, the signal of telecommunication is carried out the conversion contrary with transmitter.
The method of mu-law companding based on FHT and improvement conversion suppression optical OFDM system PAPR, step is as follows:
Step 1: the highspeed serial data stream of input becomes the parallel data stream of N road low speed through serioparallel exchange, to every road
Digital signal uses QPSK mode to carry out mapping generation complex valued signals；
Step 2: the complex valued signals generated is carried out FHT computing, is used for reducing the PAPR of signal；
Step 3: again signal is carried out IFFT computing, has been used for the modulation of OFDM plural number Equivalent Base-Band signal；
The mu-law companding conversion again signal improved after the computing of step 4:IFFT；
Step 5: add Cyclic Prefix, with the intersymbol interference avoiding signal asynchronous and caused by channel dispersion；
Step 6: carry out digital-to-analogue conversion, becomes continuous print analogue signal by discrete digital signal transition；
Step 7: carry out Electro-optical Modulation；
Step 8: optical channel transmits；
Step 9: in receiving terminal part, uses the method for relevant detection to carry out the detection of optical signal.
Further, in step 4, the mu-law companding of improvement is transformed to a process repeating companding filtering, and concrete operations are such as
Under: first use mu-law companding function that signal is carried out companding process；Afterwards, then convert the signal into frequency domain through FFT computing to carry out
Frequency domain filtering, returns time domain by IFFT computing the most again, and above procedure is for carrying out a companding filtering；This process needs weight
Carrying out m time again, m is maximum number of repetitions, and mu-law companding conversion is to amplify small amplitude signal at transmitting terminal significantly to believe with compression
Number.
Further, in step 7, Electro-optical Modulation is to complete complex-valued OFDM signal with two MZM composition light I/Q modulator
Real empty two parts transform to area of light from electrical domain, each MZM real part and imaginary part by ofdm signal respectively drives.
Further, in step 9, be light ofdm signal is converted into electricity ofdm signal after, electricity ofdm signal pass through low pass
Wave filter is filtered, and then carries out analog digital conversion, converts analog signals into digital signal, remove Cyclic Prefix, then enter
Row solves companding transform m time；Then carrying out FFT computing, IFHT computing, inverse mapping is and transmission by the digital signal after IFHT
QPSK constellation point work that end is corresponding demodulate accordingly, and the N road parallel digital signal obtained is converted into original by parallel/serial conversion
Binary serial digital signal.
Advantages of the present invention and providing the benefit that:
Traditional Hadamard conversion and mu-law companding conversion are first improved, cascades the most again.FHT computing
Computation complexity is more much lower than what Hadamard converted, and the mu-law companding conversion of improvement can be to peak-to-average force ratio performance and the bit error rate
Performance carries out combined optimization, is controlled signal BER performance while reducing signal PAPR, and eliminates in repetitive process
The out of band spectrum regeneration caused by signal distortion.After signal has been carried out FHT computing, the PAPR of signal declines a part, then
During the companding transform that signal is improved, would not be very serious to the predistortion of signal, so carry out inverse transformation at receiving terminal
Time, signaling protein14-3-3 is more satisfactory.The method proposed is better than the PAPR performance of individually employing one of which method, and comprehensively
Performance is better than traditional SLM, PTS method.
Accompanying drawing explanation
Fig. 1 is the mu-law companding conversion block diagram improved.
Fig. 2 is the CO-OFDM system block diagram of institute's extracting method, and wherein, m is the number of times repeating companding filtering.
Fig. 3 is CCDF (CCDF) curve of distinct methods.
Fig. 4 is institute's extracting method and selected mapping method, the CCDF curve comparison diagram of partial transmission sequence method.
Fig. 5 is the bit error rate figure of the companding filtering of institute's extracting method and individually improvement.
Fig. 6 is institute's extracting method and selected mapping method, the bit error rate figure of partial transmission sequence method.
Subordinate list explanation
The complexity contrast table that table 1 is institute's extracting method, selected mapping method, partial transmission sequence method.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further detail:
Embodiment:
The CO-OFDM system block diagram of institute's extracting method, as shown in Figure 2.Base band is mainly believed by radio frequency OFDM transmitter module
Number process, convert including the mu-law companding of serioparallel exchange, subcarrier mapping, fast hadamard transform, improvement, in inverse quick Fu
Leaf transformation, add Cyclic Prefix and digital-to-analogue conversion etc..Radio frequency to light up converter is to utilize I/Q modulator to be changed into by the signal of telecommunication
Optical signal.Through the light ofdm signal of optical fiber link transmission, coherent detection technology is utilized to realize in light to radio-frequency down-conversion device
Optical signal is to the transformation of the signal of telecommunication.Radio frequency OFDM receiver carries out the conversion contrary with transmitter to the signal of telecommunication.Radio frequency OFDM sends out
The work sending machine and receiver utilizes matlab software to realize, and radio frequency is to light up converter, optical channel and light to radio-frequency down-conversion
Device part is then completed by optisystem software.
The job analysis of this embodiment:
Step 1: the highspeed serial data stream of input becomes the parallel data stream of N road low speed through serioparallel exchange, to every road
Digital signal uses QPSK mode to carry out mapping generation complex valued signals.
Step 2: the complex valued signals generated is carried out FHT computing, is used for reducing the PAPR of signal.In theory, FHT is exactly
Hadamard matrix is decomposed into the product of sparse matrix, implements similar with FFT, use butterfly conversion, simply there is no multiplication
Computing.For Hadamard converts, fast algorithm can reduce operand.
Step 3: again signal is carried out IFFT computing, has been used for the modulation of OFDM plural number Equivalent Base-Band signal.
The mu-law companding conversion again signal improved after the computing of step 4:IFFT.The mu-law companding improved is transformed to one
Repeating the process of companding filtering, concrete operations are as follows: first use mu-law companding function that signal is carried out companding process；Afterwards, then warp
Crossing FFT computing to convert the signal into frequency domain and carry out frequency domain filtering, return time domain by IFFT computing the most again, above procedure is for entering
Companding filtering of row.This process needs to repeat m time, and m is maximum number of repetitions.Mu-law companding conversion is at transmitting terminal
Amplify small amplitude signal and compress significantly signal.This step process sees accompanying drawing 1.
Step 5: add Cyclic Prefix.Cyclic Prefix is to be copied to by a part of subcarrier data of OFDM symbol afterbody
Before OFDM symbol, form prefix, with the intersymbol interference avoiding signal asynchronous and caused by channel dispersion.
Step 6: carry out digital-to-analogue conversion.Digital-to-analogue conversion is that discrete digital signal transition is become continuous print analogue signal.
Step 7: carry out Electro-optical Modulation.Electro-optical Modulation is to complete complex value OFDM letter with two MZM composition light I/Q modulator
Number real empty two parts transform to area of light from electrical domain, each MZM real part and imaginary part by ofdm signal respectively drives.
Step 8: optical channel transmits.
Step 9: in receiving terminal part, uses the method for relevant detection to carry out the detection of optical signal.Light ofdm signal is turned
After changing electricity ofdm signal into, electricity ofdm signal is filtered by low pass filter, then carries out analog digital conversion, by analogue signal
It is converted into digital signal, removes Cyclic Prefix, then carry out m time and solve companding transform.Then FFT computing, IFHT computing, warp are carried out
Cross the digital signal after IFHT to be the QPSK constellation point corresponding with transmitting terminal by inverse mapping and make corresponding demodulation, the N road obtained
Parallel digital signal is converted into original binary serial digital signal by parallel/serial conversion.
Fig. 3 is CCDF (CCDF) curve of distinct methods.As seen from Figure 3: the present invention can have
The PAPR of the reduction CO-OFDM system of effect, and along with the increase of number of repetition m, reducing effect is the most obvious.
Fig. 4 is institute's extracting method and selected mapping method, the CCDF curve comparison diagram of partial transmission sequence method.Can be seen by Fig. 4
Go out: the present invention is at m=1, during μ=1, reduce PAPR effect and selected mapping method (D=8), partial transmission sequence (V=8) close；
At m=3, during μ=1, frequently the two to be got well to reduce PAPR effect.
Fig. 5 is the bit error rate figure of the companding filtering of institute's extracting method and individually improvement.As seen from Figure 5: individually use
The bit error rate performance that the μ improved leads companding transform and the employing present invention is suitable, say, that fast hadamard transform is to system by mistake
Code check does not affect.
Fig. 6 is institute's extracting method and selected mapping method, the bit error rate figure of partial transmission sequence method.As seen from Figure 6: this
Bright bit error rate performance is similar with selective mapping, poorer than partial transmission sequence method.
The complexity contrast table that table 1 is institute's extracting method, selected mapping method, partial transmission sequence method.As can be seen from Table 1:
Various methods are in the case of reduction PAPR effect is similar, and the computation complexity of the present invention is minimum；It is similar at computation complexity
In the case of, it is best that the present invention reduces PAPR effect.
Table 1
It will be clear that, the invention is not restricted to embodiment here, those skilled in the art according to the announcement of the present invention,
Conspicuously improved and the modification made by present inventive concept all should be within protection scope of the present invention.
Claims (5)
1. the method for mu-law companding based on FHT and improvement conversion suppression optical OFDM system PAPR, it is characterised in that:
By the process to baseband signal of the radio frequency OFDM transmitter module；
Utilize I/Q modulator that the signal of telecommunication is changed into optical signal by radio frequency to light up converter；
Through the light ofdm signal of optical fiber link transmission, coherent detection technology is utilized to realize light letter in light to radio-frequency down-conversion device
Number to the transformation of the signal of telecommunication；
By radio frequency OFDM receiver, the signal of telecommunication is carried out the conversion contrary with transmitter.
The method of mu-law companding based on FHT and improvement conversion suppression optical OFDM system PAPR the most according to claim 1, its
It is characterised by that step is as follows:
Step 1: the highspeed serial data stream of input becomes the parallel data stream of N road low speed through serioparallel exchange, to every railway digital
Signal uses QPSK mode to carry out mapping generation complex valued signals；
Step 2: the complex valued signals generated is carried out FHT computing, is used for reducing the PAPR of signal；
Step 3: again signal is carried out IFFT computing, has been used for the modulation of OFDM plural number Equivalent Base-Band signal；
The mu-law companding conversion again signal improved after the computing of step 4:IFFT；
Step 5: add Cyclic Prefix, with the intersymbol interference avoiding signal asynchronous and caused by channel dispersion；
Step 6: carry out digital-to-analogue conversion, becomes continuous print analogue signal by discrete digital signal transition；
Step 7: carry out Electro-optical Modulation；
Step 8: optical channel transmits；
Step 9: in receiving terminal part, uses the method for relevant detection to carry out the detection of optical signal.
The method of mu-law companding based on FHT and improvement conversion suppression optical OFDM system PAPR the most according to claim 2, its
Being characterised by: in step 4, the mu-law companding of improvement is transformed to a process repeating companding filtering, and concrete operations are as follows: first make
With mu-law companding function, signal is carried out companding process；Afterwards, then convert the signal into frequency domain through FFT computing and carry out frequency domain filter
Ripple, returns time domain by IFFT computing the most again, and above procedure is for carrying out a companding filtering；This process needs to repeat
M time, m is maximum number of repetitions, and mu-law companding conversion is to amplify small amplitude signal at transmitting terminal and compress significantly signal.
The method of mu-law companding based on FHT and improvement conversion suppression optical OFDM system PAPR the most according to claim 2, its
Being characterised by: in step 7, Electro-optical Modulation is to complete real empty the two of complex-valued OFDM signal with two MZM composition light I/Q modulator
Part transforms to area of light from electrical domain, and each MZM real part and imaginary part by ofdm signal respectively drives.
The method of mu-law companding based on FHT and improvement conversion suppression optical OFDM system PAPR the most according to claim 2, its
Be characterised by: in step 9, be light ofdm signal is converted into electricity ofdm signal after, electricity ofdm signal entered by low pass filter
Row filtering, then carries out analog digital conversion, converts analog signals into digital signal, remove Cyclic Prefix, then carries out m decompression
Expand conversion；Then carrying out FFT computing, IFHT computing, inverse mapping is corresponding with transmitting terminal by the digital signal after IFHT
QPSK constellation point also makees corresponding demodulation, and the N road parallel digital signal obtained is converted into original binary system by parallel/serial conversion
Serial digital signal.
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Cited By (9)
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| CN106972891A (en) * | 2017-02-14 | 2017-07-21 | 北京光锁科技有限公司 | A kind of Ditital modulation method, digital transmission unit and equipment |
| CN107154909A (en) * | 2017-05-03 | 2017-09-12 | 天津理工大学 | Joint IPTS and iteration mu-law companding conversion drop CO ofdm systems PAPR method |
| CN107222445A (en) * | 2017-06-22 | 2017-09-29 | 中国人民解放军国防科学技术大学 | A kind of improved unitary transformation pretreatment OFDM transmission method |
| CN108040027A (en) * | 2017-12-06 | 2018-05-15 | 中山大学 | VLC system OOFDM modulator approaches based on the amplification of Hadamard matrixes |
| CN109120569A (en) * | 2018-10-12 | 2019-01-01 | 西南石油大学 | A kind of reduction PAPR method based on signal restoring in F-OFDM system |
| CN109639617A (en) * | 2019-01-21 | 2019-04-16 | 中国地质大学（武汉） | A kind of bandwidth conservation type peak-to-average force ratio in optical OFDM system based on APTS technology inhibits system |
| CN109672642A (en) * | 2019-01-21 | 2019-04-23 | 中国地质大学（武汉） | A kind of bandwidth conservation type peak-to-average force ratio in optical OFDM system based on RPTS technology inhibits system |
| CN109889463A (en) * | 2019-01-21 | 2019-06-14 | 中国地质大学（武汉） | A kind of bandwidth conservation type peak-to-average force ratio in optical OFDM system based on IPTS technology inhibits system |
| CN111641579A (en) * | 2020-06-08 | 2020-09-08 | 西安电子科技大学 | Peak clipping-piecewise linear broadening method for reducing peak-to-average power ratio of optical OFDM system signal |
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| CN106972891A (en) * | 2017-02-14 | 2017-07-21 | 北京光锁科技有限公司 | A kind of Ditital modulation method, digital transmission unit and equipment |
| CN107154909A (en) * | 2017-05-03 | 2017-09-12 | 天津理工大学 | Joint IPTS and iteration mu-law companding conversion drop CO ofdm systems PAPR method |
| CN107222445A (en) * | 2017-06-22 | 2017-09-29 | 中国人民解放军国防科学技术大学 | A kind of improved unitary transformation pretreatment OFDM transmission method |
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| CN108040027A (en) * | 2017-12-06 | 2018-05-15 | 中山大学 | VLC system OOFDM modulator approaches based on the amplification of Hadamard matrixes |
| CN109120569A (en) * | 2018-10-12 | 2019-01-01 | 西南石油大学 | A kind of reduction PAPR method based on signal restoring in F-OFDM system |
| CN109120569B (en) * | 2018-10-12 | 2020-11-24 | 西南石油大学 | PAPR reduction method based on signal restoration in F-OFDM system |
| CN109639617A (en) * | 2019-01-21 | 2019-04-16 | 中国地质大学（武汉） | A kind of bandwidth conservation type peak-to-average force ratio in optical OFDM system based on APTS technology inhibits system |
| CN109672642A (en) * | 2019-01-21 | 2019-04-23 | 中国地质大学（武汉） | A kind of bandwidth conservation type peak-to-average force ratio in optical OFDM system based on RPTS technology inhibits system |
| CN109889463A (en) * | 2019-01-21 | 2019-06-14 | 中国地质大学（武汉） | A kind of bandwidth conservation type peak-to-average force ratio in optical OFDM system based on IPTS technology inhibits system |
| CN111641579A (en) * | 2020-06-08 | 2020-09-08 | 西安电子科技大学 | Peak clipping-piecewise linear broadening method for reducing peak-to-average power ratio of optical OFDM system signal |
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Application publication date: 20170111 |