CN106877935A - Phase method for precoding and vector millimeter-wave signal generation system that constellation point distribution is optimized - Google Patents
Phase method for precoding and vector millimeter-wave signal generation system that constellation point distribution is optimized Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/345—Modifications of the signal space to allow the transmission of additional information
- H04L27/3461—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel
- H04L27/3483—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel using a modulation of the constellation points
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
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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
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5055—Laser transmitters using external modulation using a pre-coder
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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]
- H04B10/5561—Digital phase modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
- H04L27/2096—Arrangements for directly or externally modulating an optical carrier
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Abstract
The invention belongs to light carrier radio communication system technical field, the phase method for precoding and the vector millimeter-wave signal generation system based on the method for constellation point distribution optimization can be specially realized.The phase method for precoding that constellation point distribution of the invention is optimized, it is to realize that constellation point distribution is optimized by adjusting precoding phase factor, being uniformly distributed for the vector signal constellation point that receiving terminal receives can be promoted, so as to improve the performance of the vector signal for detecting.Vector millimeter-wave signal generation system based on above-mentioned phase pre-coding scheme, the generation of high stability, high-purity and high performance six frequencys multiplication electric vector millimeter wave can be realized, have the advantages that to perform simple, simple structure, its application in light carrier radio communication system can simplify light carrier radio communication system framework, reduce light carrier radio communication system cost.
Description
Technical field
The invention belongs to light-carried wireless（Radio-over-Fiber, is abbreviated as RoF）Art communication systems field, specifically relates to
And the phase method for precoding of constellation point distribution optimization and the vector millimeter-wave signal generation based on the method can be realized
System.
Background technology
Millimeter wave generation based on photon technology can realize very high-frequency operation.It is spaced when there is CF
（30-300GHz）Two continuous wave light waves realize beat frequency via the broad band photodiode that an achievable square-law is detected
When, an electric millimeter wave just can be produced.There are many advantages from the two of lasing light emitter continuous wave light waves, such as stablize
Frequency, low phase and intensity noise, and simple structure.Photoproduction millimeter wave based on frequency multiplication can be by using appropriate
Driving voltage drives an intensity modulator to realize.Scientific research circle has been proposed that and experimentally confirms and can realize based on again
The different schemes of the photoproduction millimeter wave of frequency.One of which scheme increases Dare type intensity modulator and realizes light carrier using a Mach
Suppress, so as to realize double frequency【J. Yu, Z. Jia, L. Yi, Y. Su, G. K. Chang, and T. Wang,
“Optical millimeter-wave generation or up-conversion using external
modulators,” Photon. Technol. Lett., vol. 18, no. 1, pp. 265-267, 2006】Or six
Frequency multiplication【J. Lu, Z. Dong, J. Liu et al., “Generation of a frequency sextupled
optical millimeter wave with a suppressed central carrier using one single-
electrode modulator,” Optical Fiber Technology, vol. 20, no. 5, pp. 533-536,
2014】Millimeter wave generation.This scheme can reduce the requirement to rf frequency and photoelectric device bandwidth.And it is particularly important
Be that this scheme does not need optical filter.Photoproduction vector millimeter-wave signal technology based on optical carrier suppression needs phase and width
Degree precoding, because the optical millimeter wave signal of generation its phase and amplitude after frequency multiplication can change.
In document【C. T. Lin, P. T. Shih, W. J. Jiang, E. Z. Wong, J. J. Chen,
and S. Chi, “Photonic vector signal generation at microwave/millimeter-wave
bands employing an optical frequency quadrupling scheme,” Opt. Lett., vol.
34, no. 14, pp. 2171-2173, 2009】In, the first phase pre-coding scheme is proposed out and is tested
Property confirmation, based on the phase pre-coding scheme up to W-waveband（75-110GHz）High-frequency vector millimeter-wave signal generation
Also confirmed recently【X. Li, J. Zhang, J. Xiao; Z. Zhang, Y. Xu; J. Yu, “W-Band
8QAM Vector Signal Generation by MZM-Based Photonic Frequency Octupling,”
Photon. Technol. Lett., vol. 27, no. 12, pp. 1257-1260, 2015】.By the phase of transmitting terminal
The planisphere of vector signal will have different Euclidean distances between its neighbouring constellation point after the precoding of position【Y. Wang,
Y. Xu,X. Li, J. Yu, N. Chi, “Balance precoding technique for vectro signal
generation based on OCS,” Photon. Technol. Lett., vol. 27, no. 23, pp. 2469-
2472, 2016】.Due to the small effective number of bits of digital analog converter in limited signal to noise ratio and high-frequency, some constellation points
Gather together, so as to deteriorate the performance of the vector signal that receiving terminal is detected.In order to solve this problem, one kind is named as
The scheme of balanced type phase precoding is confirmed recently, and realizes good performance【Y. Wang, Y. Xu, X.
Li, J. Yu, N. Chi, “Balance precoding technique for vectro signal generation
based on OCS,” Photon. Technol. Lett., vol. 27, no. 23, pp. 2469-2472, 2016】。
The present invention proposes a kind of phase pre-coding scheme of novelty, and the program is by adjusting precoding phase factor come real
The optimization of existing constellation point distribution.Also, also further improve the vector millimeter wave based on the frequency multiplication of light six using this scheme
The performance of signal generating system.
The content of the invention
For above-mentioned situation, constellation point is realized by adjusting precoding phase factor it is an object of the invention to provide one kind
The phase method for precoding for optimizing is distributed, can be applied in the photoproduction vector millimeter wave structure based on optical sccond-harmonic generation, to realize
The generation of high stability, high-purity and high performance electric vector millimeter wave.The present invention also provides a kind of based on the phase precoding
The vector millimeter-wave signal generation system of method, it has simple structure, performs simple, cost is efficient, systematic function is good etc.
Advantage.
The phase method for precoding that the constellation point distribution that the present invention is provided is optimized, is by adjusting precoding phase factor
It is specific as follows come what is realized：
As a example by using the situation of the frequency multiplication of light six and QPSK modulation formats.Driving the phase of radiofrequency signal should meetφ =φ data /x.Hereφ data It is the phase of target vector signal,xIt is precoding phase factor.Due to QPSK signals have it is constant
Amplitude, without amplitude precoding.The phase of QPSK signalsφ data Fall (π/4,3 π/4, -3 π/4,-π/4), and
And in the case of six frequencys multiplication precoding phase factorxShould be 6.Phase so after precodingφFall (π of pi/2 4,3/
24, -3 pi/2s 4,-pi/2 4), such as Fig. 1（a）It is shown.According to Fig. 1（a）From top to bottom, we are by phase for shown constellation dot sequency
PositionφPoint at 3 pi/2s 4 is defined as A points, and phase is pi/2 4, the location point of the pi/2 4 of-pi/2 4, -3 is respectively defined as B points, C
Point and D points.We assume here that signal to noise ratio is 25dB.Due in limited signal to noise ratio and high-frequency digital analog converter it is small
Effective number of bits, point A and point B, point B and point C, and point C and point D will mutually be close together.But due to clockwise
On direction be from point D to the distance of point A it is big, point A and point D will not mutually draw close.In view of this reason, for six times
For the millimeter-wave signal generation of frequency, precoding phase factor should drop to the degree less than 6, rightly to increase above-mentioned possibility
The distance between neighbouring constellation point being close together.Fig. 1（b）Give the precoding planisphere that the precoding factor is 5.4.From
Fig. 1（b）In we can see that point A（Phase positionφAt 15 π/108）With point B（Phase positionφAt 5 π/108）,
Point B and point C（Phase positionφAt -5 π/108）, and point C and point D（Phase positionφAt -15 π/108）Between
Distance is compared with Fig. 1（a）For increased.
The generation system of the vector millimeter-wave signal based on above-mentioned phase method for precoding that the present invention is provided, concrete scheme is such as
Under：
The carrying of the precoding based on the generation of off-line digital signal processing module sends the radiofrequency signal of data, via digital-to-analogue conversion
Device resume module is simultaneously amplified through electric amplifier.Sending data can use QPSK, 8QAM, 16QAM isovector modulation format.For
For the millimeter-wave signal generation of six frequencys multiplication, precoding phase factor should drop to the degree less than 6, rightly to increase possibility
The distance between neighbouring constellation point being close together.Then the radiofrequency signal of the precoding increases via the single Mach for driving
One light wave of continuous wavelength of Dare modulators modulate.The Mach that this singly drives increases Dare modulator and is operated in optical carrier suppression
Point, its output is the three rank subcarriers that two frequency intervals are six times of RF drive frequency.Generation two three rank subcarriers with
The heterodyne beat in a single-ended photodiode afterwards, so as to generate electric vector that carrier frequency is six times of RF drive frequency in the least
Metric wave signal.As a result of the reason of transmitting terminal precoding, there is the electric vector millimeter-wave signal of generation conventional vector to adjust
Form processed.The electric vector millimeter-wave signal of generation is captured by analog-digital converter module and processed through off-line digital signal processing module again
Afterwards, original transmission data can therefrom be recovered.
Vector millimeter-wave signal generation system based on above-mentioned phase pre-coding scheme of the present invention, including：
Transmitting terminal off-line digital signal processing module, the carrying for generating precoding sends the RF driving signal of data, hair
Sending data can use QPSK, 8QAM, 16QAM isovector modulation format；
One digital analog converter module, the digital-to-analogue conversion for performing precoding RF driving signal；
One electric amplifier, for amplifying precoding radio-frequency driven electric signal；
One single-mode laser, for producing single mode CW light carrier long；
One single driving Mach increases Dare modulator, the light for the modulation of precoding radio-frequency driven electric signal to be arrived laser output
On carrier wave, to provide three rank subcarriers of two frequency intervals as six times of RF drive frequency；
One bias DC voltage source, for driving Mach increasing Dare modulator to provide bias voltage for single；
One single-ended photodiode, two heterodyne beats of three rank subcarriers for realizing optical modulator generation, to generate
Electric vector millimeter-wave signal；
One analog-digital converter module, the analog-to-digital conversion of the electric vector millimeter-wave signal for realizing generation；
Receiving terminal off-line digital signal processing module, for processing the vector millimeter-wave signal after analog-to-digital conversion, to recover original
The transmission data of beginning.
The present invention realizes that the phase that constellation point distribution is optimized is pre- by adjusting precoding phase factor using novel
Coding method, Dare modulator and a single-ended photodiode are increased based on the single Mach for driving, and realize high stability
The generation of the vector millimeter-wave signal of high-purity superperformance, and have the advantages that simple structure, cost are efficient, it is simple to perform.
Brief description of the drawings
Fig. 1 is the phase that constellation point distribution optimization is realized by adjusting precoding phase factor proposed by the present invention
Pre-coding scheme.Wherein, (a) is the planisphere that precoding phase factor is 6.B () is the constellation that precoding phase factor is 5.4
Figure.
Fig. 2 is the vector millimeter-wave signal generation system based on above-mentioned phase pre-coding scheme and the frequency multiplication of light six of the invention
System schematic diagram.
Label in figure：1 is transmitting terminal off-line digital signal processing module, and 2 is digital analog converter module, and 3 is electric amplifier,
4 is single-mode laser, and 5 drive Mach to increase Dare modulator for single, and 6 is bias DC voltage source, and 7 is single-ended photodiode, 8
It is analog-digital converter module, 9 is receiving terminal off-line digital signal processing module, and 10 is based on above-mentioned phase pre-coding scheme and light
The vector millimeter-wave signal generation system of six frequencys multiplication.
Specific embodiment
With reference to specific experiment example and accompanying drawing, the present invention is illustrated.
Fig. 2 show the vector millimeter-wave signal generation system based on above-mentioned phase pre-coding scheme and the frequency multiplication of light six, it
Including：
Transmitting terminal off-line digital signal processing module 1, its Main Function produces precoding based on off-line digital signal transacting
Carry the radiofrequency signal for sending data.Sending data can use QPSK, 8QAM, 16QAM isovector modulation format.For six times
For the millimeter-wave signal generation of frequency, precoding phase factor should drop to the degree less than 6, may be drawn close with rightly increasing
The distance between neighbouring constellation point together.
Digital analog converter module 2, its Main Function is that the carrying of the precoding produced to off-line digital signal transacting sends
The radiofrequency signal of data performs digital-to-analogue conversion.
Electric amplifier 3, its Main Function is the power for amplifying precoding radio-frequency driven electric signal.
Single-mode laser 4, its Main Function is the single longitudinal mode laser for exporting assigned frequency as light carrier.Can be using each
Plant the different commodity laser of line width, such as narrow linewidth laser, outside cavity gas laser, directly modulation laser, distributed Feedback
Laser, vertical cavity surface emitting laser etc..The performance of electric vector millimeter-wave signal of the laser linewidth to being subsequently generated does not have
Have an impact.
Single to drive Mach to increase Dare modulator 5, its Main Function is under the driving of precoding radiofrequency signal, to light carrier
It is modulated, its modulation system is that single driving Mach increases Dare modulator for optical carrier suppression mode, i.e. DC offset voltage
Half-wave voltage.Single output for driving Mach to increase Dare modulator is two three rank subcarriers, and its frequency interval is precoding radio frequency
Six times of driving frequency.
Bias DC voltage source 6, its Main Function is to drive Mach increasing Dare modulator to provide bias voltage for single.
Single-ended photodiode 7, its Main Function is that two three rank subcarriers to generating perform heterodyne beat, so that raw
It is the electric vector millimeter-wave signal of six times of RF drive frequency into carrier frequency.As a result of the reason of transmitting terminal precoding,
The electric vector millimeter-wave signal of generation has conventional Vector Modulation form.
Analog-digital converter module 8, its Main Function is to perform analog-to-digital conversion to the electric vector millimeter-wave signal that detection is obtained；
Receiving terminal off-line digital signal processing module 9, its Main Function is to carry out perseverance to the vector millimeter-wave signal after digitlization
Mould equilibrium and carrier auxiliary, therefrom to recover original transmission data.
Heretofore described realizes that the phase that constellation point distribution is optimized prelists by adjusting precoding phase factor
Code scheme and the vector millimeter-wave signal based on above-mentioned phase pre-coding scheme and the frequency multiplication of light six generation system, be suitable for U, V,
The light carrier radio communication system of various different frequency ranges such as W, D.
In a word, the phase for realizing that constellation point distribution is optimized by adjusting precoding phase factor of the present invention is pre-
Encoding scheme and the generation system of the vector millimeter-wave signal based on above-mentioned phase pre-coding scheme and the frequency multiplication of light six, with execution
Simply, the advantage of simple structure, its application in light carrier radio communication system can simplify light carrier radio communication system framework,
Reduce light carrier radio communication system cost.
Claims (3)
1. the phase method for precoding that a kind of constellation point distribution is optimized, is realized by adjusting precoding phase factor,
Characterized in that, for the situation using the frequency multiplication of light six and QPSK modulation formats, driving the phase of radiofrequency signal to meetφ = φ data /x, hereφ data It is the phase of target vector signal,xPrecoding phase factor, due to QPSK signals have it is constant
Amplitude, without amplitude precoding；The phase of QPSK signalsφ data Fall (π/4,3 π/4, -3 π/4,-π/4), and
And in the case of six frequencys multiplication precoding phase factorxIt is 6, the phase after such precodingφFall (pi/2 4 of pi/2 4,3 ,-
3π/24, -π/24)；For the millimeter-wave signal generation of six frequencys multiplication, precoding phase factor drops to the degree less than 6, with
The distance between neighbouring constellation point that rightly increase may be close together.
2. a kind of vector millimeter-wave signal based on phase method for precoding described in claim 1 generates system, it is characterised in that
The carrying of the precoding based on the generation of off-line digital signal processing module sends the radiofrequency signal of data, via digital-to-analogue conversion
Device resume module is simultaneously amplified through electric amplifier, is sent data and is used QPSK, 8QAM or 16QAM Vector Modulation form, for six times
For the millimeter-wave signal generation of frequency, precoding phase factor drops to the degree less than 6, may be drawn close one with rightly increasing
The distance between neighbouring constellation point for rising；Then the radiofrequency signal of the precoding increases Dare and modulates via the single Mach for driving
Device modulates a light wave for continuous wavelength, and the Mach that this singly drives increases Dare modulator and is operated in optical carrier suppression point, its output
It is that two frequency intervals are three rank subcarriers of six times of RF drive frequency；Two three rank subcarriers of generation are then in a list
Heterodyne beat in the photodiode of end, so that the electric vector millimeter-wave signal that carrier frequency is six times of RF drive frequency is generated,
As a result of the reason of transmitting terminal precoding, the electric vector millimeter-wave signal of generation has conventional Vector Modulation form；It is raw
Into electric vector millimeter-wave signal by analog-digital converter module capture again through off-line digital signal processing module process after, it is therefrom extensive
The transmission data for appearing again original.
3. vector millimeter-wave signal according to claim 2 generates system, it is characterised in that including：
Transmitting terminal off-line digital signal processing module, the carrying for generating precoding sends the RF driving signal of data, hair
Data are sent to use QPSK, 8QAM or 16QAM Vector Modulation form；
One digital analog converter module, the digital-to-analogue conversion for performing precoding RF driving signal；
One electric amplifier, for amplifying precoding radio-frequency driven electric signal；
One single-mode laser, for producing single mode CW light carrier long；
One single driving Mach increases Dare modulator, the light for the modulation of precoding radio-frequency driven electric signal to be arrived laser output
On carrier wave, to provide three rank subcarriers of two frequency intervals as six times of RF drive frequency；
One bias DC voltage source, for driving Mach increasing Dare modulator to provide bias voltage for single；
One single-ended photodiode, two heterodyne beats of three rank subcarriers for realizing optical modulator generation, to generate
Electric vector millimeter-wave signal；
One analog-digital converter module, the analog-to-digital conversion of the electric vector millimeter-wave signal for realizing generation；
Receiving terminal off-line digital signal processing module, for processing the vector millimeter-wave signal after analog-to-digital conversion, to recover original
The transmission data of beginning.
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| CN109474559A (en) * | 2019-01-07 | 2019-03-15 | 重庆邮电大学 | Phase method for precoding and vector millimeter-wave signal based on phase precoding factor optimizing generate system |
| CN109660480A (en) * | 2019-01-07 | 2019-04-19 | 重庆邮电大学 | 3 frequency multiplication 8QAM vector millimeter-wave signal production methods and device based on amplitude precoding |
| CN111147148A (en) * | 2019-12-19 | 2020-05-12 | 北京邮电大学 | Signal sending method, device, terminal and medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115987404B (en) * | 2023-03-20 | 2023-06-02 | 北京理工大学 | Photon radio frequency signal generation method based on precoding and probability shaping combined optimization |
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