WO2019088352A1 - Procédé de modulation de coordonnées polaires et appareil de modulation, et système de communication sans fil optique les utilisant - Google Patents

Procédé de modulation de coordonnées polaires et appareil de modulation, et système de communication sans fil optique les utilisant Download PDF

Info

Publication number
WO2019088352A1
WO2019088352A1 PCT/KR2017/014671 KR2017014671W WO2019088352A1 WO 2019088352 A1 WO2019088352 A1 WO 2019088352A1 KR 2017014671 W KR2017014671 W KR 2017014671W WO 2019088352 A1 WO2019088352 A1 WO 2019088352A1
Authority
WO
WIPO (PCT)
Prior art keywords
constellation
symbol
modulation
rearranging
unit
Prior art date
Application number
PCT/KR2017/014671
Other languages
English (en)
Korean (ko)
Inventor
김정현
김영우
문성재
사기동
Original Assignee
한국광기술원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 한국광기술원 filed Critical 한국광기술원
Publication of WO2019088352A1 publication Critical patent/WO2019088352A1/fr

Links

Images

Classifications

    • 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
    • H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • 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
    • 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
    • H04L27/36—Modulator circuits; Transmitter circuits
    • 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
    • H04L27/38—Demodulator circuits; Receiver circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to a polar modulation method and modulator, and a wireless optical communication system using the same. More particularly, the present invention relates to a polar coordinate modulation method and a modulator between symbols in a magnitude-phase plane, and a wireless optical communication system using the same.
  • Wireless LAN technology using visible broadband (400 ⁇ 700nm) in indoor LAN has been researched and developed due to advantages such as physical security and freedom of frequency interference.
  • LEDs light emitting diodes
  • LEDs have long life, low power consumption and high quality of light, and can be used as a transmitter of data transmission, since LEDs can be controlled on / off and dimming.
  • OBC Optical Wireless Communication
  • each transmit LED of the spatially multiplexed OWC multiple-input multiple-output (MIMO) transmission / reception system increases the transmission amount by transmitting different data without additional transmission power or frequency allocation, As a method of satisfying the requirements.
  • wireless optical communication because of the characteristics of light, it is impossible to apply a modulation method using phase accuracy to an actual system. Therefore, wireless optical communication should use a structure that transmits and receives signals by intensity modulation and direct reception (IM / DD) method.
  • IM / DD intensity modulation and direct reception
  • PCM Polar Coordinate Modulation
  • An object of the present invention is to propose a method and an apparatus for improving reception performance in a wireless optical communication system using modulation of a PCM scheme.
  • Another object of the present invention is to provide a wireless optical communication system having a low complexity and capable of high bit rate transmission.
  • a polar coordinate modulation method for a symbol having the same Euclidean distance comprising the steps of: symbol-mapping data by quadrature amplitude modulation (QAM); Rearranging the constellation of the mapped symbol; And separating the size and phase information of the rearranged symbol.
  • QAM quadrature amplitude modulation
  • the step of rearranging the constellation of the polar coordinate modulation method of a symbol having the same Euclidian distance in one embodiment includes the steps of obtaining a basis vector of size N, generating an NxN property store using the basis vector And transforming the constellation point into a complex plane and rearranging constellation diagrams.
  • the polar modulation method of a symbol having the same Euclidean distance in one embodiment includes the steps of generating an NxN property store using the basis vector and changing the generated property store to a complex plane to rearrange the constellation And determining whether or not the QAM is a square QAM.
  • a polar modulation apparatus comprising: a quadrature amplitude modulation mapping unit for generating a symbol having the same Euclidean distance; A constellation rearranging unit for rearranging the constellation of the symbol generated from the quadrature amplitude modulation mapping unit; And the constellation rearrangement unit rearranges the symbols of the constellation diagram by modulating the size and phase information.
  • the constellation rearranging unit of the polar coordinate modulating apparatus further includes a basis vector generating unit.
  • a wireless optical communication system including: a quadrature amplitude modulation mapping unit for generating symbols having the same Euclidean distance; A constellation rearranging unit for rearranging the constellation of the symbol generated from the quadrature amplitude modulation mapping unit; A polar coordinate modulating unit for modulating a symbol of constellation rearranged by the constellation rearranging unit by separating magnitude and phase information; A plurality of light sources for dividing a signal modulated by the polar modulation unit into a magnitude and a phase to transmit a corresponding intensity of light; And a receiver for receiving the light of the plurality of emitted light sources and receiving the data.
  • the receiver of the wireless optical communication system includes a plurality of photodiodes for receiving light of the transmitted plurality of light sources, a channel estimator for estimating a channel using light received from the plurality of photodiodes, A MIMO interference cancellation signal detector for detecting a symbol based on the determined channel, a polarity demodulator for demodulating polar coordinates of the determined symbol to generate a quadrature amplitude modulated symbol, a quadrature amplitude modulation for demapping the quadrature amplitude modulated symbol, And a demapper portion.
  • the effect of the present invention is that it is possible to configure the Euclidean distance to be the same without the nonlinear characteristic even if the PCM modulation is used.
  • the size of the symbol is smaller than that of the conventional PCM method, and the power consumption can be reduced.
  • Figure 4 illustrates the performance of the present invention and models the geometric channel between the transmitting LED and the receiving PD of the system for verification.
  • FIG. 5 is a block diagram of an OWC-MIMO system using a general PCM modulation scheme.
  • FIG. 6 shows a simulation result in which a complex plane M-QAM signal is mapped to a magnitude-phase plane using PCM
  • Figure 9 is a configuration diagram of the OWC-MIMO system using the modulated PCM modulation
  • FIG. 12 is a schematic diagram illustrating a general PCM and a proposed PCM in the case of 4QAM, 16QAM, and 64QAM.
  • first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.
  • / or < / RTI &gt includes any combination of a plurality of related listed items or any of a plurality of related listed items.
  • the symbol of the modulated signal has a complex number form.
  • FIG. 4 is a diagram for modeling a geometric channel between a transmitting LED and a receiving PD of a system for explaining and verifying the performance of the present invention.
  • the system modeling considered OWC channels consisting of NT transmit LEDs and NR receive PDs.
  • FIG. 5 is a configuration diagram of an OWC-MIMO system that uses a modulation of a general PCM scheme.
  • the system includes a transmitting unit 100 and a receiving unit 200.
  • the transmitter 100 maps the input DATA to a symbol of a predetermined quadrature amplitude modulation type in a quadrature amplitude modulation mapper (QAM mapper) 110.
  • the symbols mapped in the quadrature amplitude modulation mapper 110 may have a constellation having a square shape or a constellation having a non-square shape.
  • the mapped symbol is obtained by obtaining the size and phase information of the symbol using the size information extracting unit 121 and the phase information extracting unit 122 in the polar coordinate modulating unit 120, (141 to 144).
  • the transmitted signal is received by a plurality of photodiodes 211 to 214 through a predetermined channel H, the channel estimating unit 220 estimates a channel using the received signal, The MIMO interference cancellation signal detector 230 removes the interference signal and determines a symbol of the received signal. The determined symbol finally decodes the data through the polar coordinate demodulator 240 and the quadrature amplitude demodulator 250.
  • FIG. 6 is a simulation result in which a complex plane M-QAM signal is mapped to a magnitude-phase plane using PCM.
  • the Euclidean distance between symbols in the magnitude-phase plane is constant even if the plane is changed.
  • the Euclidean distance between symbols is constant not. In this size-phase plane, the Euclidean distance between polar coordinate symbols is non-uniform, resulting in BER performance degradation.
  • the present invention proposes a modified polar coordinate modulation method and apparatus for eliminating features with nonuniform Euclidean distance by applying a PCM to change the symbol from a complex plane to a magnitude-phase plane.
  • FIG. 9 is a configuration diagram of an OWC-MIMO system using the modified PCM modulation of the present invention.
  • the system of the present invention includes a constellation rearrangement (CR) 160, whose position is located between the quadrature amplitude modulation mapper 110 and the polar coordinate modulator 120.
  • the constellation rearranging unit 160 rearranges the constellation.
  • the polar coordinate modulation unit extracts the size and phase information of the symbol, modulates the signal, and transmits the signal using the plurality of LEDs 141 to 144.
  • the constellation rearranging unit 160 may be constituted by a single apparatus together with the polar coordinate modulating unit 120.
  • the constellation rearranging unit 160 may be configured as shown in FIG.
  • P k, l means the constellation point, and round (x) is a function that rounds x.
  • the method of rearranging the constellation is to use the number of syllable points included in the constellation ( Calculating a size (N) of a basis vector for constellation reconstruction, generating a basis vector (vec), generating an NxN property store using the vector, Changing the store to a complex plane and rearranging the constellation.
  • the step of rearranging the constellation based on the generated basis vector is divided into the case of the square QAM and the case of the non-square QAM, and the case of the case of the square QAM , There is no need for additional steps, but for non-square QAM ( ) In this order, the steps of removing and reconstructing the constellation are performed.
  • the step of generating the basis vectors may be computed as a function of N such as that shown in Fig.
  • the input of the CR function is the magnitude of the required constellation , And the output is a newly reordered set of 16-QAM property stores.
  • cal (16) function is used to calculate the size value 4 of the basis vector for generating a new constellation, and as a result, a base vector vec having a size of 4 is generated.
  • the plane of the generated basis vector is the polar coordinate magnitude-phase plane.
  • the C QAM generated after the transformation is 16 in size and is a set of homogeneous complex planar constellations for polar modulation.
  • the polar modulation unit 120 Based on the rearranged property store set, the polar modulation unit 120 performs PCM modulation.
  • 12 is a constellation diagram in which 4QAM, 16QAM, and 64QAM are performed in a general PCM and a proposed PCM.
  • 12 (a) has a non-uniform Euclidian distance, as described above, when a symbol having a constellation shown in FIG. 12 (a) is converted to an amplitude-phase plane by a general PCM. 12 (b) can be obtained by rearranging the constellation proposed in the present invention by the constellation having the same constellation as that of FIG. 12. Although the Euclidean distance between symbols on the complex plane is not the same, - In terms of the phase plane, it has a uniform Euclidean distance (Fig. 12 (d)).
  • Simulation was performed to verify the performance of the polar modulation method and apparatus using the proposed constellation rearrangement.
  • FIG. 13 compares the bit error rate (BER) performance of the polar modulation scheme using the coordinate modulation scheme and the constellation rearrangement in 4QAM, 16QAM, and 64QAM.
  • the BER performance is shown to be about 5dB for 4QAM, about 8dB for 16QAM, and about 9dB for 64QAM in polar modulation schemes using constellation rearrangement. It can be seen that, in a general polar coordinate modulation scheme, as the number of stores increases, the number of interference areas increases, which means that the number of symbols affected by the interference increases and the BER performance decreases. For this reason, as the degree of modulation of QAM increases, the performance of the polar modulation method applied with CR is further improved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

La présente invention concerne un appareil de modulation de coordonnées polaires et un procédé de modulation de coordonnées polaires. L'appareil de modulation de coordonnées polaires comprend : une unité de mappage de modulation d'amplitude en quadrature pour générer des symboles ayant la même distance euclidienne; et une unité de réarrangement de constellation pour réarranger une constellation des symboles générés par l'unité de mappage de modulation d'amplitude en quadrature, les symboles de la constellation réarrangée par l'unité de réarrangement de constellation étant modulés par séparation d'informations de taille et de phase. Le procédé de modulation comprend : le mappage de données à des symboles par modulation d'amplitude en quadrature (QAM); le réarrangement d'une constellation des symboles mappés; et la séparation d'informations de taille et de phase dans les symboles réarrangés.
PCT/KR2017/014671 2017-10-30 2017-12-13 Procédé de modulation de coordonnées polaires et appareil de modulation, et système de communication sans fil optique les utilisant WO2019088352A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2017-0142736 2017-10-30
KR1020170142736A KR102022289B1 (ko) 2017-10-30 2017-10-30 극좌표 변조방법 및 변조장치, 이를 이용한 무선광통신 시스템

Publications (1)

Publication Number Publication Date
WO2019088352A1 true WO2019088352A1 (fr) 2019-05-09

Family

ID=66333199

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2017/014671 WO2019088352A1 (fr) 2017-10-30 2017-12-13 Procédé de modulation de coordonnées polaires et appareil de modulation, et système de communication sans fil optique les utilisant

Country Status (2)

Country Link
KR (1) KR102022289B1 (fr)
WO (1) WO2019088352A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111327398A (zh) * 2020-02-11 2020-06-23 北京邮电大学 极化多天线序号调制系统的信号发送、接收方法和装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060038710A1 (en) * 2004-08-12 2006-02-23 Texas Instruments Incorporated Hybrid polar/cartesian digital modulator
KR20110139350A (ko) * 2010-06-23 2011-12-29 삼성전자주식회사 가시광 통신 시스템에서 다중 발광 다이오드를 이용하여 최적의 전송률을 얻기 위한 장치 및 방법
US20120281988A1 (en) * 2010-01-07 2012-11-08 Hitachi, Ltd. Optical Transmission System
KR20170040560A (ko) * 2015-10-05 2017-04-13 한국전자통신연구원 가시광 무선 통신 장치 및 이를 이용한 방법
KR20170042312A (ko) * 2014-08-06 2017-04-18 인터디지탈 패튼 홀딩스, 인크 장치-대-장치 송신 패턴을 결정하기 위한 방법 및 장치

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005295521A (ja) * 2004-03-10 2005-10-20 Matsushita Electric Ind Co Ltd データ変換装置、データ変換方法、それらを用いた送信回路、通信機器、および電子機器
KR20080067741A (ko) * 2007-01-17 2008-07-22 삼성전자주식회사 무선통신시스템에서 최대 전력대 평균 전력비를 줄이기위한 장치 및 방법
KR100974132B1 (ko) * 2008-05-09 2010-08-04 엘지에릭슨 주식회사 파장무의존 광 송수신기 및 이를 포함하는 광통신 시스템

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060038710A1 (en) * 2004-08-12 2006-02-23 Texas Instruments Incorporated Hybrid polar/cartesian digital modulator
US20120281988A1 (en) * 2010-01-07 2012-11-08 Hitachi, Ltd. Optical Transmission System
KR20110139350A (ko) * 2010-06-23 2011-12-29 삼성전자주식회사 가시광 통신 시스템에서 다중 발광 다이오드를 이용하여 최적의 전송률을 얻기 위한 장치 및 방법
KR20170042312A (ko) * 2014-08-06 2017-04-18 인터디지탈 패튼 홀딩스, 인크 장치-대-장치 송신 패턴을 결정하기 위한 방법 및 장치
KR20170040560A (ko) * 2015-10-05 2017-04-13 한국전자통신연구원 가시광 무선 통신 장치 및 이를 이용한 방법

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111327398A (zh) * 2020-02-11 2020-06-23 北京邮电大学 极化多天线序号调制系统的信号发送、接收方法和装置
CN111327398B (zh) * 2020-02-11 2021-06-22 北京邮电大学 极化多天线序号调制系统的信号发送、接收方法和装置

Also Published As

Publication number Publication date
KR102022289B1 (ko) 2019-09-18
KR20190048156A (ko) 2019-05-09

Similar Documents

Publication Publication Date Title
Berenguer et al. Optical wireless MIMO experiments in an industrial environment
CN110581732B (zh) 基于神经网络的室内可见光通信多目标优化系统及方法
CN103560986B (zh) 基于mimo-ofdm调制的可见光通信系统及信道估计方法
CN103457661B (zh) 一种led阵列可见光通信系统及其通信方法
CN108366031B (zh) 结合调光控制的反极性多脉冲位置调制光ofdm系统
CN110855713B (zh) 一种WiFi设备到ZigBee设备的跨协议通信方法及系统
CN107018105B (zh) 水下可见光通信方法及系统
Chen et al. OFDM-based generalized optical MIMO
CN109005136A (zh) 一种基于多概率阵列波束映射的多载波光信号发射方法
CN105812309A (zh) 一种降低ofdm-vlc系统峰均功率比的调制方法
CN109831399A (zh) 一种人工智能辅助的ofdm接收机
Deng et al. Real-time software-defined single-carrier QAM MIMO visible light communication system
CN108259403A (zh) 一种vlc/rf混合ofdm基带系统
Deng et al. Software defined adaptive MIMO visible light communications after an obstruction
CN110048984B (zh) 一种融合空间调制的非正交多址接入技术的通信方法
WO2019088352A1 (fr) Procédé de modulation de coordonnées polaires et appareil de modulation, et système de communication sans fil optique les utilisant
CN108847886A (zh) 一种空分复用方式的信号传输方法
Chen et al. Joint colour-and-spatial modulation aided visible light communication system
KR102010640B1 (ko) 다중 사용자 전이중 가시광 통신 장치
CN205670775U (zh) 一种自适应的可见光ofdm基带通信系统
Celik et al. Quadrature spatial modulation sub-carrier intensity modulation (QSM-SIM) for VLC
Deng et al. Adaptive real-time software defined MIMO visible light communications using spatial multiplexing and spatial diversity
Xu et al. A novel non-Hermitian symmetry orthogonal frequency division multiplexing system for visible light communications
CN110289875A (zh) 一种人工智能辅助的分布式mimo接收机
Narmanlioglu et al. Performance of OFDM-based adaptive visible light communications

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17930916

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17930916

Country of ref document: EP

Kind code of ref document: A1