CN103916356B - Low-peak-to-average-ratio wireless optical transmission method based on dynamic scalar regulation - Google Patents

Low-peak-to-average-ratio wireless optical transmission method based on dynamic scalar regulation Download PDF

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CN103916356B
CN103916356B CN201410131898.6A CN201410131898A CN103916356B CN 103916356 B CN103916356 B CN 103916356B CN 201410131898 A CN201410131898 A CN 201410131898A CN 103916356 B CN103916356 B CN 103916356B
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signal
ofdm
symbol
scalar
time domain
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CN103916356A (en
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张华�
袁颖
许威
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Southeast University
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Southeast University
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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
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • 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
    • H04L27/2623—Reduction thereof by clipping
    • H04L27/2624—Reduction thereof by clipping by soft clipping
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)

Abstract

The invention discloses a low-peak-to-average-ratio wireless optical transmission method based on dynamic scalar regulation. The low-peak-to-average-ratio wireless optical transmission method based on dynamic scalar regulation comprises the steps that different scalar regulation coefficients are selected according to time domain peak values of all OFDM symbols, the symbols with extremely large peak values are compressed to a certain extent, in this way, the PAPR of signals of a whole frame is lowered, and therefore the transmission performance is improved; a user just needs to measure the average power of the received symbols at the receiving end so as to estimate the multiplied regulation coefficient, and the method is easy to realize; requirements of a system for power amplifiers and the degree of linearity of LED lamps are lowered due to the fact that the PAPR is lowered, nonlinear distortion of signals in an electric and optical domain is reduced, and the receiving performance of the system is improved; the direct-current bias needing to be added at the transmitting end is reduced due to the fact that the PAPR is lowered, and power consumption of the system is reduced.

Description

A kind of low peak average ratio wireless optical transmission method being adjusted based on dynamic scalar
Technical field
The present invention relates to a kind of low peak average ratio wireless optical transmission method adjusting based on dynamic scalar, belong to wireless light communication Technology.
Background technology
It is excellent that wireless light communication is enriched due to its frequency spectrum resource, communications security is good, transmission power is big, electromagnetic radiation is few etc. Gesture, had become as the focus of communications field research in the last few years.In order to realize the high speed data transfer of wireless light communication, fall Low intersymbol interference（ISI）, in wireless light communication introduce OFDM modulation, by by the symbol parallel modulating in orthogonal son Send on carrier wave it is provided that high speed data transfer, resist multipath effect.
Normal use intensity modulation/direct detection in wireless light communication（IM/DD）, therefore OFDM modulation after time domain transmitting Signal demand ensures as real-valued positive signal.There are two kinds of the more commonly used optic communication OFDM methods, direct current biasing light OFDM at present （DCO-OFDM）With asymmetric peak clipping light OFDM（ACO-OFDM）.ACO-OFDM only transmits modulation symbol in odd subcarriers, Even subcarriers do not send symbol, and the negative fraction of the time-domain signal obtaining through IFFT is abandoned, and only retain positive portions.This Sample both can guarantee that the time-domain signal of transmission was positive real signal, can reduce transmission power again, economize on resources, but frequency efficiency Relatively low, N number of subcarrier can only send N/4 symbol, and this method adds direct current inclined to sacrifice data rate and to avoid for cost The power attenuation put.On DCO-OFDM i.e. signal after modulating through OFDM add direct current biasing so that signal be changed on the occasion of, This method realizes simple, frequency efficiency height, but is the increase in DC power.
Similar with the ofdm system in radio communication, the ofdm system in wireless light communication there is also signal peak-to-average power power Than too high problem.PAPR is higher to propose very high requirement to the linearity of transmitter terminal power amplifier, in optical OFDM system, PAPR too high in addition to power amplifier, also higher requirement is proposed to the linearity of LED, because power amplifier and LED are non-linear Characteristic can lead to non-linear distortion, thus seriously reducing the overall performance of system.Meanwhile, in wireless light communication DCO-OFDM system In, the direct current biasing that high PAPR also results in needs increases, thus increasing system power consumption.
The a variety of methods reducing ofdm system PAPR, such as amplitude limit, dynamic star are had been proposed in twireless radio-frequency communication Seat figure extension（ACE）, coding, partial transmission sequence（PTS）, selected mapping method（SLM）, preserved sub-carrier（TR）Deng.
Content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention provides one kind to adjust based on dynamic scalar Low peak average ratio wireless optical transmission method, be a kind of realize very simply reduce wireless light communication PAPR method, its basis The time domain peak of each OFDM symbol selecting different scalar adjustment factors, thus king-sized symbol carries out one to peak value Determine the compression of degree, thus reducing the PAPR of whole frame signal, thus improving transmission performance；Also only need to by measurement in receiving terminal The mean power receiving symbol, to estimate the scalar factor being multiplied by transmitting terminal, is realized simple；The improvement of PAPR reduces The requirement to power amplifier and the LED linearity for the system, decreases the non-linear distortion in electricity, area of light for the signal, and the system that improves receives Performance；The decline of PAPR decreases the direct current biasing that transmitting terminal needs to increase, and decreases system power dissipation.
Technical scheme：For achieving the above object, the technical solution used in the present invention is：
A kind of low peak average ratio wireless optical transmission method being adjusted based on dynamic scalar,
In transmitting terminal, first, system produces bit information flow needs the frequency domain symbol of transmitting through constellation point modulation； Secondly, frequency-region signal conjugation is symmetrically mapped on system subcarrier, and passes through inverse fast Fourier transform（IFFT）Produce real The base band time domain orthogonal frequency division multiplexing of value（OFDM）Transmission signal；Then, the time domain peak according to each OFDM symbol, to every Individual symbol is multiplied by corresponding scalar adjustment factor；Finally, time domain transmission signal drives light emitting diode after adding direct current biasing （LED）Launched；
In receiving terminal, first, the optical signal receiving is converted into the signal of telecommunication by photodiode, and receiver is according to receiving Each OFDM symbol mean power estimate the scalar adjustment factor that signal is multiplied by transmitting terminal；Then, will receive Time-domain OFDM symbol do fast Fourier transform divided by after the adjustment factor estimating（FFT）Be converted to frequency domain symbol, and move Except conjugation symmetric part；Finally, demodulated obtain receive symbol.The present invention realizes simply, can effectively reducing wireless optical and leading to The peak-to-average power ratio of letter ofdm system, reduces system power dissipation, and by reducing, power amplifier and the LED linearity is wanted Asking, reducing the non-linear distortion in electricity, area of light for the signal, thus improving system receptivity.
Said method specifically includes following steps：
Transmitting terminal：
（11）In transmitting terminal, the sub-carrier number of setting wireless optic communication ofdm system is N, and every frame sending signal has M OFDM symbol；The binary data source that information source produces is modulated through M-ary Quadrature Amplitude（M-QAM）, form frequency domain to be sent Signalm=1,2,...,M；
（12）It is real-valued to meet wireless optical signal, the mapping of OFDM sub-carriers is carried out according to formula below, meets altogether Yoke symmetry：（In the case of not causing and obscuring, for simplifying explanation, subscript (m) omits）
Wherein, ()*Represent and take complex conjugate；
（13）It is as follows that frequency-region signal switchs to real-valued time domain OFDM signal after N point IFFT：
Wherein, n=0,1 ..., N-1, are time-domain OFDM symbol sequence；
（14）According to the peak value of each time-domain OFDM symbol, the suitable adjustment factor of selection in { 1, α }, wherein 0<α< 1, it is the scalar adjustment factor of the OFDM symbol excessive for compression peaks, usual span 0.5～0.9 is typically desirableHaveWherein adjustment factor meetsT is positive threshold value, permissible Distribution according to transmission signal peak value and the different values of the characteristic of channel, are such as modulated for using 16-QAM, sub-carrier number N= 128 optical OFDM system, when taking thresholding T=3.1, has 10% OFDM symbol peak value to exceed thresholding and will be conditioned compression；
（15）Signal after being adjustedM=1 ..., M is sent to optical communication transmission module, Launch plus driving LED after direct current biasing；
Receiving terminal：
（21）In receiving terminal, photodiode converts optical signals to the time domain signal of telecommunication, by calculating what each received OFDM symbolMean power adopt maximum a posteriori（MAP）Criterion estimates the index of modulation of this symbolAccording to The adjustment factor estimated, detects receipt signalI.e.Wherein The time domain OFDM transmitting symbol estimated for receiving terminal；
（22）RightFrequency-domain received signal is obtained after making N point FFTDemodulation obtains Final reception symbol.
Beneficial effect：The present invention provide based on dynamic scalar adjust low peak average ratio wireless optical transmission method, have as Lower advantage：1st, do not need to transmit extra side information, do not waste frequency resource and can effectively reduce system peak-to-average power ratio； 2nd, either transmitter or the realization of receiver are all very simple；3rd, low PAPR can reduce system to power amplifier and LED light wire Property degree requirement, that reduces transmitter realizes difficulty, and reduces the non-thread leading to due to power amplifier and LED nonlinear characteristic Property distortion, improve system receptivity；4th, low PAPR also reduces the DC component size that transmitting be must be added to, and decreases System power dissipation.
Brief description
Fig. 1 is the system block diagram of the low peak average ratio wireless optical transmission method being adjusted based on dynamic scalar proposed by the present invention；
Fig. 2 is the wireless light communication time-domain OFDM symbol schematic diagram after adjusting and be adjusted without scalar factor；
Fig. 3 is the PAPR complementation accumulated probability scatter chart of the present invention and typically unadjusted optic communication OFDM.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is further described.
It is illustrated in figure 1 a kind of low peak average ratio wireless optical transmission method adjusting based on dynamic scalar, enter as follows OK：In transmitting terminal, first, system produces the frequency domain symbol that bit information flow is modulated to need transmitting through constellation point；Its Secondary, frequency-region signal conjugation is symmetrically mapped on system subcarrier, and produces real-valued base band by inverse fast Fourier transform Time domain transmission signal；Then, the time domain peak according to each OFDM symbol, is multiplied by corresponding scalar and adjusts system to each symbol Number；Finally, time domain transmission signal is launched plus direct current biasing driven for emitting lights diode.In receiving terminal, first, photoelectricity two pole The optical signal receiving is converted into the signal of telecommunication by pipe, estimates that signal is being sent out according to each the OFDM symbol mean power receiving Penetrate the scalar adjustment factor that end is multiplied by；Then, the time-domain OFDM symbol receiving is done divided by after the adjustment factor estimating Fast Fourier transform is converted to frequency domain symbol, and removes conjugation symmetric part；Finally, demodulated obtain receive symbol.
It is as follows that said method implements process：
Transmitting terminal：
（11）In transmitting terminal, the sub-carrier number of setting wireless optic communication ofdm system is N, and every frame sending signal has M OFDM symbol；The binary data source that information source produces is modulated through M-ary Quadrature Amplitude（M-QAM）, form frequency domain to be sent Signalm=1,2,...,M；
（12）It is real-valued to meet wireless optical signal, the mapping of OFDM sub-carriers is carried out according to formula below, meets altogether Yoke symmetry：（In the case of not causing and obscuring, for simplifying explanation, subscript (m) omits）
Wherein, ()*Represent and take complex conjugate；
（13）It is as follows that frequency-region signal switchs to real-valued time domain OFDM signal after N point IFFT：
Wherein, n=0,1 ..., N-1, are time-domain OFDM symbol sequence；
（14）According to the peak value of each time-domain OFDM symbol, the suitable adjustment factor of selection in { 1, α }, wherein 0<α< 1, it is the scalar adjustment factor of the OFDM symbol excessive for compression peaks, usual span 0.5～0.9 is typically desirableHaveWherein adjustment factor meetsT is positive threshold value, Ke Yigen According to the distribution of transmission signal peak value and the different values of the characteristic of channel, such as modulate for using 16-QAM, sub-carrier number N=128 Optical OFDM system, when taking thresholding T=3.1, have 10% OFDM symbol peak value to exceed thresholding and will be conditioned compression；
（15）Signal after being adjustedM=1 ..., M is sent to optical communication transmission module, Launch plus driving LED after direct current biasing；
Receiving terminal：
（21）In receiving terminal, photodiode converts optical signals to the time domain signal of telecommunication, is received by calculating each OFDM symbolMean power adopt maximum a posteriori（MAP）Criterion estimates the index of modulation of this symbolAccording to the adjustment factor estimated, detect receipt signalI.e.WhereinThe time domain OFDM transmitting symbol estimated for receiving terminal；
（22）RightFrequency-domain received signal is obtained after making N point FFTDemodulation obtains Final reception symbol.
As shown in Fig. 2 according to the time domain peak of each OFDM, each symbol is multiplied by with corresponding scalar adjustment factor, right It is multiplied by adjustment factor α (α in the excessive symbol of peak value<1), whole OFDM symbol is compressed, thus reducing the PAPR of whole frame signal.
Fig. 3 gives the optic communication ofdm system without coefficient adjustment and the PAPR using system after this method is complementary Integral distribution curve.System is all modulated using 16-QAM, during sub-carrier number N=128, takes thresholding T=3.1, adjustment factor As sub-carrier number N=1024, take thresholding T=3.8, adjustment factorBy frame statistical system PAPR, that is,：
The PAPR of system can effectively be reduced as can be observed from Figure using this method, thus reducing transmitting terminal device Linearity, reduces the non-linear distortion in electricity, area of light for the signal, improves the overall receptivity of system.
The above be only the preferred embodiment of the present invention it should be pointed out that：Ordinary skill people for the art For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (2)

1. a kind of based on dynamic scalar adjust low peak average ratio wireless optical transmission method it is characterised in that：
In transmitting terminal, first, system produces the frequency-region signal that bit information flow is modulated to need transmitting through constellation point；Its Secondary, frequency-region signal conjugation is symmetrically mapped on system subcarrier, and produces real-valued base band by inverse fast Fourier transform Time domain transmission signal；Then, the time domain peak according to each OFDM symbol, is multiplied by corresponding scalar and adjusts system to each symbol Number；Finally, time domain transmission signal is launched plus direct current biasing driven for emitting lights diode；
In receiving terminal, first, the optical signal receiving is converted into the signal of telecommunication by photodiode, according to each receiving OFDM symbol mean power estimates the scalar adjustment factor that signal is multiplied by transmitting terminal；Then, by the time domain OFDM receiving Symbol is converted to frequency-region signal divided by doing fast Fourier transform after the adjustment factor estimating, and removes conjugation symmetric part； Finally, demodulated obtain receive symbol.
2. according to claim 1 based on dynamic scalar adjust low peak average ratio wireless optical transmission method it is characterised in that： Comprise the steps：
Transmitting terminal：
(11) in transmitting terminal, the sub-carrier number of setting wireless optic communication ofdm system is N, and every frame sending signal has M OFDM symbol Number；The binary data source that information source produces is modulated through M-ary Quadrature Amplitude, forms frequency-region signal to be sentM=1,2 ..., M, what subscript (m) represented is m-th OFDM symbol Number；
(12) OFDM sub-carriers mapping is carried out according to formula below, meets conjugate symmetry：
X k ( m ) = 0 , k = 0 , N 2 X k ( m ) , k = 1 , ... , N 2 - 1 ( X N - k ( m ) ) * , k = N 2 + 1 , ... , N - 1
Wherein, ()*Represent and take complex conjugate；
(13) to switch to real-valued time domain OFDM signal after N point IFFT as follows for frequency-region signal：
x n ( m ) = 1 N &Sigma; k = 0 N - 1 X k ( m ) e j 2 &pi; k n / N
Wherein, n=0,1 ..., N-1, are time-domain OFDM symbol sequence；
(14) peak value according to each time-domain OFDM symbol, the suitable adjustment factor of selection in { 1, α }, wherein 0 ＜ α ＜ 1, It is the limit value of the scalar adjustment factor of the OFDM symbol excessive for compression peaks；HaveWherein adjustment factor is full FootT is positive threshold value；
(15) signal after being adjustedM=1 ..., M is sent to optic communication Transmitter module, drives LED transmitting after adding direct current biasing；
Receiving terminal：
(21) in receiving terminal, photodiode converts optical signals to the time domain signal of telecommunication, by calculating the OFDM that each receives SymbolMean power estimate the adjustment factor of this symbol using maximum a posteriori criterionAccording to the regulation estimated Coefficient, detects receipt signalI.e.Wherein The time domain OFDM transmitting symbol estimated for receiving terminal；
(22) rightFrequency-domain received signal is obtained after making N point FFTSolution Adjust and obtain final reception symbol.
CN201410131898.6A 2014-04-02 2014-04-02 Low-peak-to-average-ratio wireless optical transmission method based on dynamic scalar regulation Expired - Fee Related CN103916356B (en)

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