WO2017185665A1 - 面向调光控制的可见光通信方法及装置 - Google Patents

面向调光控制的可见光通信方法及装置 Download PDF

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WO2017185665A1
WO2017185665A1 PCT/CN2016/102207 CN2016102207W WO2017185665A1 WO 2017185665 A1 WO2017185665 A1 WO 2017185665A1 CN 2016102207 W CN2016102207 W CN 2016102207W WO 2017185665 A1 WO2017185665 A1 WO 2017185665A1
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signal frame
visible light
signal
threshold
dimming control
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French (fr)
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杨昉
高俊男
宋健
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Tsinghua University
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Tsinghua 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
    • 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
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]

Definitions

  • the present invention relates to the field of visible light communication and intelligent lighting technologies, and in particular, to a visible light communication method and apparatus for dimming control.
  • VLC Vehicle Light Communication
  • LED illumination uses a light source to transmit high-frequency signals that are invisible to the naked eye to transmit information, with its spectrum width, green energy saving, deep coverage, It has a good development prospect because it can be combined with lighting.
  • dimming control for the lighting function of VLC system is also a very important and practical technology.
  • the dimming control technology can control the intensity of the light within the required range and make full use of the dynamic linear range of the LED lamp, so that people can adjust the indoor lighting according to their own requirements for lighting intensity and energy saving.
  • Two dimming control technologies are widely used in the industry: one is a constant current regulator (CCR) dimming technology that realizes dimming by adjusting current, and the other is pulse width modulation (PWM) that realizes dimming by adjusting the duty ratio. ) Dimming technology.
  • CCR constant current regulator
  • PWM pulse width modulation
  • the present invention aims to solve at least one of the technical problems in the related art to some extent.
  • Another object of the present invention is to provide a visible light communication device for dimming control.
  • an embodiment of the present invention provides a visible light communication method for dimming control, comprising the steps of: modulating a bit to be transmitted to obtain a positive signal frame and a negative signal frame; Determining a ratio of the positive polarity signal frame to the negative polarity signal frame and a signal frame amplification factor; multiplying the positive polarity signal frame and the negative polarity signal frame by the signal frame amplification factor, and according to the proportion Performing hybrid multiplexing to obtain a mixed signal frame; adding a DC offset to the negative polarity signal frame in the mixed signal frame to obtain a signal frame to be transmitted, performing digital-to-analog conversion and frequency conversion on the to-be-transmitted signal frame, After the filtering, the visible light driving current is controlled, and the visible light communication signal is obtained and transmitted.
  • the visible light communication method for dimming control according to the embodiment of the present invention can simultaneously implement the illumination dimming control in the visible light communication, and can realize large-scale and fine dimming control without affecting the visible light communication condition, and has good communication quality. , high energy efficiency and other advantages.
  • the visible light communication method for dimming control may further have the following additional technical features:
  • the positive polarity signal frame is one of an ACO-OFDM signal frame, a PAM-DMT signal frame, and a HACO-OFDM signal frame; and the negative polarity signal frame is passed Performing a positive partial zero on the ACO-OFDM signal frame, or the PAM-DMT signal frame, or the bipolar signal before the asymmetric limiting of the HACO-OFDM signal frame, and retaining the bipolar signal The negative part is obtained.
  • the value of the DC offset is less than or equal to the maximum current of the linear range of visible light.
  • the required light modulation degree is less than the first threshold, only the positive polarity signal frame is used, and the desired light tone is achieved by adjusting the signal amplification factor. a system; if the required light modulation degree is greater than a second threshold, using only the negative polarity signal frame, and adjusting the signal amplification factor to achieve the desired light modulation degree; if the desired light modulation degree And between the first threshold and the second threshold, fixing the signal amplification factor, adjusting a ratio of the positive polarity signal frame to the negative polarity signal frame, so that the positive polarity signal frame and the negative polarity signal frame The weighted average is equal to the desired degree of light modulation.
  • the determining criterion of the first threshold and the second threshold is to make a time domain signal chopping ratio reach a preset value, or to make signal power and tangent distortion power and noise The ratio of the sum of power is the largest.
  • a visible light communication device for dimming control, comprising: a signal generating module, configured to modulate a bit to be transmitted to obtain a positive signal frame and a negative signal frame; a generating module, configured to determine a proportion of the positive polarity signal frame and the negative polarity signal frame and a signal frame amplification factor according to the required light modulation degree; and a signal fusion module, configured to use the positive polarity signal frame and the negative polarity signal Multiplying the frame by the signal frame amplification factor, and performing hybrid multiplexing according to the ratio to obtain a mixed signal frame; the signal sending module uses Adding a DC offset to the negative polarity signal frame in the mixed signal frame to obtain a signal frame to be transmitted, controlling the visible light driving current after performing digital-to-analog conversion, frequency conversion, and filtering on the to-be-transmitted signal frame, and obtaining The visible light communication signal is sent after.
  • the visible light communication device for dimming control can simultaneously perform illumination dimming control while receiving visible light communication, and can realize large-scale and fine dimming control without affecting visible light communication conditions, and has good communication quality. , high energy efficiency and other advantages.
  • the visible light communication device for dimming control may further have the following additional technical features:
  • the positive polarity signal frame is one of an ACO-OFDM signal frame, a PAM-DMT signal frame, and a HACO-OFDM signal frame; and the negative polarity signal frame is passed Performing a positive partial zero on the ACO-OFDM signal frame, or the PAM-DMT signal frame, or the bipolar signal before the asymmetric limiting of the HACO-OFDM signal frame, and retaining the bipolar signal The negative part is obtained.
  • the value of the DC offset is less than or equal to the maximum current of the linear range of visible light.
  • the required light modulation degree when the required light modulation degree is less than the first threshold, only the positive polarity signal frame is used, and the desired light tone is achieved by adjusting the signal amplification factor. a system; when the required light modulation degree is greater than a second threshold, using only the negative polarity signal frame, and adjusting the signal amplification factor to achieve the desired light modulation degree; when the light modulation degree is in the When the first threshold and the second threshold are between, the signal amplification factor is fixed, and the ratio of the positive signal frame to the negative signal frame is adjusted to make a weighted average of the positive signal frame and the negative signal frame The value is equal to the desired degree of light modulation.
  • the determining criterion of the first threshold and the second threshold is to make a time domain signal chopping ratio reach a preset value, or to make signal power and tangent distortion power and noise The ratio of the sum of power is the largest.
  • FIG. 1 is a flow chart of a visible light communication method for dimming control according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a positive polarity signal frame, a negative polarity signal frame, and a mixed signal frame according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of a visible light communication device facing dimming control according to an embodiment of the present invention.
  • a visible light communication method and apparatus for dimming control according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
  • a visible light communication method for dimming control according to an embodiment of the present invention will be described with reference to the accompanying drawings.
  • FIG. 1 is a flow chart of a visible light communication method for dimming control according to an embodiment of the present invention.
  • the visible light communication method for dimming control includes the following steps:
  • step S101 the bits to be transmitted are modulated to obtain a positive polarity signal frame and a negative polarity signal frame.
  • the bits to be transmitted are first modulated to generate a positive signal frame and a negative signal frame.
  • the positive polarity signal frame is one of an ACO-OFDM signal frame, a PAM-DMT signal frame, and a HACO-OFDM signal frame, that is, the positive polarity signal frame may be an ACO-OFDM signal frame. , or a PAM-DMT signal frame, or a HACO-OFDM signal frame.
  • the negative polarity signal frame is positive for the bipolar signal before the ACO-OFDM signal frame, or the PAM-DMT signal frame, or the HACO-OFDM signal frame asymmetrically amplitude limiting.
  • the number of parts is set to zero and the negative part of the bipolar signal is retained.
  • step S102 the ratio of the positive polarity signal frame to the negative polarity signal frame and the signal frame amplification factor are determined according to the required light modulation degree.
  • the required light modulation degree is less than the first threshold, only the positive polarity signal frame is used, and the required light modulation factor is adjusted by adjusting the signal amplification factor; if the required light modulation degree is required When the value is greater than the second threshold, only the negative signal frame is used, and the required light modulation degree is adjusted by adjusting the signal amplification factor; if the required light modulation degree is between the first threshold and the second threshold, the fixed signal amplification factor is adjusted.
  • the ratio of the positive polarity signal to the negative polarity signal is such that the weighted average of the positive polarity signal frame and the negative polarity signal frame is equal to the desired light modulation.
  • the negative polarity signal frame cannot directly calculate the light modulation degree, but weights the biased negative polarity signal frame and the positive polarity signal frame. It is known to the skilled person that it can be stated that the weighted average of the negative polarity signal frames is equal to the desired degree of light modulation.
  • the first threshold and the second threshold are determined by using a ratio of the signal power to the sum of the top-end distortion power and the noise power. maximum.
  • the preset value can be set according to the actual situation.
  • the determination criterion of the first threshold ⁇ 1 and the second threshold ⁇ 2 is to make the time domain signal chopping ratio reach a certain value, and preferably, the chopping ratio is 1%.
  • the determination criterion of the first threshold ⁇ 1 and the second threshold ⁇ 2 is to maximize the ratio of the signal power to the sum of the top distortion power and the noise power.
  • step S103 as shown in FIG. 2, the positive polarity signal frame and the negative polarity signal frame are multiplied by the signal frame amplification factor, and are mixed and multiplexed according to the ratio to obtain a mixed signal frame.
  • step S104 as shown in FIG. 3, the negative polarity signal frame in the mixed signal frame is DC-biased to obtain a signal frame to be transmitted, and the visible light is controlled after the digital-to-analog conversion, frequency conversion, and filtering of the signal frame to be transmitted. Drive current and send it after receiving visible light communication signal.
  • the value of the DC offset is less than or equal to the maximum current of the linear range of visible light.
  • the embodiment specifically discloses a visible light communication method for dimming control, wherein the signal modulation mode is ACO-OFDM modulation, and the method includes the following steps:
  • S1 Modulate the bit to be transmitted to generate a positive signal frame and a negative signal frame.
  • the positive polarity signal frame is generated, which specifically includes: the constellation mapping symbol X k obtained by the 16QAM constellation mapping after the bit to be transmitted is normalized, and after the Hermitian symmetric structure is formed, the data is transmitted only on the odd subcarriers, and the even subcarriers are transmitted.
  • serializing and converting to obtain an OFDM data block of length N After zeroing, serializing and converting to obtain an OFDM data block of length N, performing inverse fast Fourier transform to obtain a time domain bipolar signal x n , asymmetrically limiting the bipolar signal to convert the bipolar signal
  • the negative part is set to zero, and the positive part of the bipolar signal is retained to obtain a positive signal frame
  • the negative polarity signal frame is generated, which specifically includes: the constellation mapping symbol X k obtained by the 16QAM constellation mapping after the bit to be transmitted is normalized, and after the Hermitian symmetric structure is formed, the data is transmitted only on the odd subcarriers, and the even subcarriers are transmitted.
  • serializing and converting to obtain an OFDM data block of length N After zeroing, serializing and converting to obtain an OFDM data block of length N, performing inverse fast Fourier transform to obtain a time domain bipolar signal x n , asymmetrically limiting the bipolar signal to convert the bipolar signal
  • the positive part is set to zero, and the negative part of the bipolar signal is retained to obtain a negative signal frame
  • the light modulation degree of the LED lamp Where I L is the linear current minimum current of the LED lamp, I H is the maximum current, and I D is the average operating current of the LED lamp.
  • the average power of the energy normalized signal frame x n is 1, and the positive polarity signal frame And negative signal frame Root mean square
  • the signal frame is amplified by a factor of ⁇ .
  • the determining criterion of the first threshold ⁇ 1 and the second threshold ⁇ 2 is: making the time domain signal crest ratio 2.3%, then the signal frame amplification factor
  • the embodiment specifically discloses a visible light communication method for dimming control, wherein the signal modulation mode is PAM-DMT modulation, and the method includes the following steps:
  • S1 Modulate the bit to be transmitted to generate a positive signal frame and a negative signal frame.
  • the positive polarity signal frame is generated, which specifically includes: the bit to be transmitted is modulated according to the modulation mode of the PAM-DMT, and the positive polarity signal frame is obtained.
  • generating a negative polarity signal frame specifically includes: the bit to be transmitted is modulated according to a modulation mode of the PAM-DMT, and the bipolar signal before the asymmetric limiting is positively zeroed, and the bipolar signal is retained. Negative part gets negative polarity signal frame
  • the light modulation degree of the LED lamp Where I L is the linear current minimum current of the LED lamp, I H is the maximum current, and I D is the average operating current of the LED lamp.
  • the average power of the energy normalized signal frame x n is 1, and the positive polarity signal frame And negative signal frame Root mean square
  • the signal frame is amplified by a factor of ⁇ .
  • the determining criterion of the first threshold ⁇ 1 and the second threshold ⁇ 2 is: making the time domain signal crest ratio 2.3%, then the signal frame amplification factor
  • the positive polarity signal frame and the negative polarity signal frame are multiplied by the amplification factor ⁇ , and are mixed and multiplexed according to a ratio of the positive polarity signal frame and the negative polarity signal frame to 1:1, preferably after each positive polarity signal frame. Connect a negative signal frame to get a mixed signal frame.
  • This embodiment specifically discloses a visible light communication method for dimming control, wherein the signal modulation mode is HACO-OFDM modulation, and the method includes the following steps:
  • S1 Modulate the bit to be transmitted to generate a positive signal frame and a negative signal frame.
  • the positive polarity signal frame is generated, and specifically includes: the bit to be transmitted is modulated according to a modulation mode of HACO-OFDM, and a positive polarity signal frame is obtained.
  • generating a negative polarity signal frame specifically includes: the bit to be transmitted is modulated according to a modulation mode of HACO-OFDM, and the bipolar signal before the asymmetric limiting is positively zeroed, and the bipolar signal is retained. Negative part gets negative polarity signal frame
  • the light modulation degree of the LED lamp Where I L is the linear current minimum current of the LED lamp, I H is the maximum current, and I D is the average operating current of the LED lamp.
  • the average power of the energy normalized signal frame x n is 1, and the positive polarity signal frame And negative signal frame Root mean square
  • the signal frame is amplified by a factor of ⁇ .
  • the determining criterion of the first threshold ⁇ 1 and the second threshold ⁇ 2 is: maximizing the ratio of the signal power to the sum of the top distortion power P distortion and the noise power P noise , then the signal frame amplification factor
  • the second threshold ⁇ 2 1 - ⁇ 1 .
  • the visible light communication method for dimming control according to the embodiment of the present invention can simultaneously implement the illumination dimming control in the visible light communication, and can realize large-scale and fine dimming control without affecting the visible light communication condition, and has communication quality. Good, high energy efficiency and other advantages.
  • FIG. 4 is a schematic structural view of a visible light communication device for dimming control according to an embodiment of the present invention.
  • the dimming control-oriented visible light communication device 10 includes a signal generating module 100, a parameter generating module 200, a signal fusion module 300, and a signal transmitting module 400.
  • the signal generating module 100 is configured to modulate a bit to be transmitted to obtain a positive signal frame and a negative signal frame.
  • the parameter generation module 200 is configured to determine a proportion of the positive polarity signal frame and the negative polarity signal frame and a signal frame amplification factor according to the required light modulation degree.
  • the signal fusion module 300 is configured to multiply the positive polarity signal frame and the negative polarity signal frame by a signal frame amplification factor, and perform hybrid multiplexing according to the proportion to obtain a mixed signal frame.
  • the signal sending module 400 is configured to add a DC offset to the negative polarity signal frame in the mixed signal frame to obtain a signal frame to be transmitted, and control the visible light driving current after performing digital-to-analog conversion, frequency conversion, and filtering on the to-be-transmitted signal frame. And get the visible light communication signal and send it.
  • the device 10 of the embodiment of the present invention can simultaneously implement the illumination dimming control in the visible light communication, and can realize large-scale and fine dimming control without affecting the visible light communication condition, and has the advantages of good communication quality and high energy efficiency.
  • the positive polarity signal frame may be one of an ACO-OFDM signal frame, a PAM-DMT signal frame, and a HACO-OFDM signal frame.
  • the negative polarity signal frame may be performed by using a bipolar signal before the ACO-OFDM signal frame, or the PAM-DMT signal frame, or the HACO-OFDM signal frame asymmetrically limiting.
  • the positive part is set to zero and the negative part of the bipolar signal is retained.
  • the value of the DC offset is less than or equal to the maximum current of the linear range of visible light.
  • the required light modulation degree when the required light modulation degree is less than the first threshold, only the positive polarity signal frame is used, and the required light modulation degree is adjusted by adjusting the signal amplification factor; when the required light modulation degree is required; When the value is greater than the second threshold, only the negative polarity signal frame is used, and the required light modulation degree is adjusted by adjusting the signal amplification factor; when the light modulation degree is between the first threshold and the second threshold, the signal amplification factor is fixed, and the positive polarity is adjusted.
  • the ratio of the signal to the negative polarity signal such that the weighted average of the positive and negative signal frames is equal to the desired degree of light modulation.
  • the negative polarity signal frame cannot directly calculate the light modulation degree, but weights the biased negative polarity signal frame and the positive polarity signal frame. It is known to the skilled person that it can be stated that the weighted average of the negative polarity signal frames is equal to the desired degree of light modulation.
  • the determining criterion of the first threshold and the second threshold is to make the time domain signal crest ratio reach a preset value, and to make the ratio of the signal power to the sum of the tangent distortion power and the noise power. maximum.
  • the visible light communication device for dimming control can simultaneously perform illumination dimming control in the visible light communication, and can realize large-scale and fine dimming control without affecting the visible light communication condition, and has communication quality. Good, high energy efficiency and other advantages.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the meaning of "a plurality” is at least two, such as two, three, etc., unless specifically defined otherwise.
  • the terms “installation”, “connected”, “connected”, “fixed” and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited.
  • the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • the first feature "on” or “under” the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact.
  • the first feature "above”, “above” and “above” the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

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Abstract

本发明公开了一种面向调光控制的可见光通信方法及装置，其中，方法包括以下步骤：对待传输比特进行调制得到正极性信号帧与负极性信号帧；根据所需光线调制度确定正极性信号帧与负极性信号帧的所占比例与信号帧放大因子；将正极性信号帧与负极性信号帧乘以信号帧放大因子，并根据所占比例进行混合复用以得到混合信号帧；将混合信号帧中的负极性信号帧加上直流偏置，以得到待发送信号帧，在对待发送信号帧进行数模变换、变频、滤波之后控制可见光驱动电流，并得到可见光通信信号后发送。该方法能够在可见光通信的同时兼顾照明调光控制，在不影响可见光通信条件下，能够实现大范围、精细化的调光控制，具有通信质量好、能量效率高等优势。

Description

面向调光控制的可见光通信方法及装置
相关申请的交叉引用
本申请要求清华大学于2016年04月28日提交的、发明名称为“面向调光控制的可见光通信方法及装置”的、中国专利申请号“201610279766.7”的优先权。
技术领域
本发明涉及可见光通信与智能照明技术领域，特别涉及一种面向调光控制的可见光通信方法与装置。
背景技术
VLC(Visible Light Communication，可见光通信)是一种在LED照明的基础上实现无线通信的技术手段，利用光源发出肉眼无法察觉的高频信号来传输信息，以其频谱宽、绿色节能、深度覆盖、可与照明有机结合的特点而具有良好的发展前景。
在可见光通信中，除了提高信息传输性能之外，针对VLC系统照明功能的调光控制也是一项非常重要且极具实用价值的技术。利用调光控制技术可以将灯光强度控制在所需范围内并充分利用LED灯的动态线性范围，使得人们可以根据自己对灯光照明强度及节约能量的要求调节室内照明情况。工业上广泛采用两种调光控制技术：一种是通过调节电流实现调光的恒定稳流器(CCR)调光技术，另一种为通过调节占空比实现调光的脉冲宽度调制(PWM)调光技术。CCR的优势在于简单、稳定，而PWM的优势在于能够提供较宽的调光范围，且可以线性调节光强。
另一方面，如何在保证可靠的宽带通信链路的同时满足高质量的照明对可见光通信也是尤为重要的，但是相关技术中的调光控制技术仍存在一些问题，例如：一方面，现有通信机制无法灵活实现调光控制；另一方面，现有的实现调光控制的系统其通信能量效率较低。
发明内容
本发明旨在至少在一定程度上解决相关技术中的技术问题之一。
为此，本发明的一个目的在于提出一种面向调光控制的可见光通信方法，该方法能够在可见光通信的同时兼顾照明调光控制。
本发明的另一个目的在于提出一种面向调光控制的可见光通信装置。
为达到上述目的，本发明一方面实施例提出了一种面向调光控制的可见光通信方法，包括以下步骤：对待传输比特进行调制得到正极性信号帧与负极性信号帧；根据所需光线调制度确定所述正极性信号帧与负极性信号帧的所占比例与信号帧放大因子；将所述正极性信号帧与负极性信号帧乘以所述信号帧放大因子，并根据所述所占比例进行混合复用以得到混合信号帧；将所述混合信号帧中的负极性信号帧加上直流偏置，以得到待发送信号帧，在对所述待发送信号帧进行数模变换、变频、滤波之后控制可见光驱动电流，并得到可见光通信信号后发送。
本发明实施例的面向调光控制的可见光通信方法，能够在可见光通信的同时兼顾照明调光控制，在不影响可见光通信条件下，能够实现大范围、精细化的调光控制，具有通信质量好、能量效率高等优势。
另外，根据本发明上述实施例的面向调光控制的可见光通信方法还可以具有以下附加的技术特征：
可选地，在本发明的一个实施例中，所述正极性信号帧为ACO-OFDM信号帧、PAM-DMT信号帧与HACO-OFDM信号帧中的一种；所述负极性信号帧为通过对所述ACO-OFDM信号帧、或者所述PAM-DMT信号帧、或者所述HACO-OFDM信号帧非对称限幅前的双极性信号进行正数部分置零并保留所述双极性信号负数部分得到。
进一步地，在本发明的一个实施例中，所述直流偏置的值小于或等于可见光线性区间的最大电流。
进一步地，在本发明的一个实施例中，如果所述所需光线调制度小于第一阈值时，仅使用所述正极性信号帧，并通过调整所述信号放大因子达到所述所需光线调制度；如果所述所需光线调制度大于第二阈值时，仅使用所述负极性信号帧，并通过调整所述信号放大因子达到所述所需光线调制度；如果所述所需光线调制度在所述第一阈值和第二阈值之间时，固定所述信号放大因子，调节所述正极性信号帧与负极性信号帧的比例，以使所述正极性信号帧与负极性信号帧的加权平均值等于所述所需光线调制度。
进一步地，在本发明的一个实施例中，所述第一阈值与所述第二阈值的确定准则为使时域信号切顶比例达到预设数值，或者使信号功率与切顶畸变功率和噪声功率之和的比值最大。
为达到上述目的，本发明另一方面实施例提出了一种面向调光控制的可见光通信装置，包括：信号生成模块，用于对待传输比特进行调制得到正极性信号帧与负极性信号帧；参数生成模块，用于根据所需光线调制度确定所述正极性信号帧与负极性信号帧的所占比例与信号帧放大因子；信号融合模块，用于将所述正极性信号帧与负极性信号帧乘以所述信号帧放大因子，并根据所述所占比例进行混合复用以得到混合信号帧；信号发送模块，用 于将所述混合信号帧中的负极性信号帧加上直流偏置，以得到待发送信号帧，在对所述待发送信号帧进行数模变换、变频、滤波之后控制可见光驱动电流，并得到可见光通信信号后发送。
本发明实施例的面向调光控制的可见光通信装置，能够在可见光通信的同时兼顾照明调光控制，在不影响可见光通信条件下，能够实现大范围、精细化的调光控制，具有通信质量好、能量效率高等优势。
另外，根据本发明上述实施例的面向调光控制的可见光通信装置还可以具有以下附加的技术特征：
可选地，在本发明的一个实施例中，所述正极性信号帧为ACO-OFDM信号帧、PAM-DMT信号帧与HACO-OFDM信号帧中的一种；所述负极性信号帧为通过对所述ACO-OFDM信号帧、或者所述PAM-DMT信号帧、或者所述HACO-OFDM信号帧非对称限幅前的双极性信号进行正数部分置零并保留所述双极性信号负数部分得到。
进一步地，在本发明的一个实施例中，所述直流偏置的值小于或等于可见光线性区间的最大电流。
进一步地，在本发明的一个实施例中，当所述所需光线调制度小于第一阈值时，仅使用所述正极性信号帧，并通过调整所述信号放大因子达到所述所需光线调制度；当所述所需光线调制度大于第二阈值时，仅使用所述负极性信号帧，并通过调整所述信号放大因子达到所述所需光线调制度；当所述光线调制度在所述第一阈值和第二阈值之间时，固定所述信号放大因子，调节所述正极性信号帧与负极性信号帧的比例，以使所述正极性信号帧与负极性信号帧的加权平均值等于所述所需光线调制度。
进一步地，在本发明的一个实施例中，所述第一阈值与所述第二阈值的确定准则为使时域信号切顶比例达到预设数值，或者使信号功率与切顶畸变功率和噪声功率之和的比值最大。
本发明附加的方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。
附图说明
本发明上述的和/或附加的方面和优点从下面结合附图对实施例的描述中将变得明显和容易理解，其中：
图1为根据本发明一个实施例的面向调光控制的可见光通信方法的流程图；
图2为根据本发明一个实施例的正极性信号帧、负极性信号帧与混合信号帧示意图；
图3是根据本发明一个实施例的面向调光控制的可见光通信方法中的待发送信号帧示 意图；以及
图4为根据本发明一个实施例的面向调光控制的可见光通信装置的结构示意图。
具体实施方式
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本发明，而不能理解为对本发明的限制。
下面参照附图描述根据本发明实施例提出的面向调光控制的可见光通信方法及装置，首先将参照附图描述根据本发明实施例提出的面向调光控制的可见光通信方法。
图1是本发明一个实施例的面向调光控制的可见光通信方法的流程图。
如图1所示，该面向调光控制的可见光通信方法包括以下步骤：
在步骤S101中，对待传输比特进行调制得到正极性信号帧与负极性信号帧。
也就是说，首先将待传输比特进行调制，产生正极性信号帧与负极性信号帧。其中，在本发明的一个实施例中，正极性信号帧为ACO-OFDM信号帧、PAM-DMT信号帧与HACO-OFDM信号帧中的一种，即正极性信号帧可以为ACO-OFDM信号帧、或者PAM-DMT信号帧、或者HACO-OFDM信号帧。
进一步地，在本发明的一个实施例中，负极性信号帧为通过对ACO-OFDM信号帧、或者PAM-DMT信号帧、或者HACO-OFDM信号帧非对称限幅前的双极性信号进行正数部分置零并保留双极性信号负数部分得到。
在步骤S102中，根据所需光线调制度确定正极性信号帧与负极性信号帧的所占比例与信号帧放大因子。
进一步地，在本发明的一个实施例中，如果所需光线调制度小于第一阈值时，仅使用正极性信号帧，并通过调整信号放大因子达到所需光线调制度；如果所需光线调制度大于第二阈值时，仅使用负极性信号帧，并通过调整信号放大因子达到所需光线调制度；如果所需光线调制度在第一阈值和第二阈值之间时，固定信号放大因子，调节正极性信号与负极性信号的比例，以使正极性信号帧与负极性信号帧的加权平均值等于所需光线调制度。需要说明的是，由于负极性信号帧的信号强度为负，负极性信号帧不可直接计算光线调制度，而是对偏置后的负极性信号帧和正极性信号帧进行加权，对于本领域的技术人员而言都是已知的，可以表述为负极性信号帧的加权平均值等于所需光线调制度。
也就是说，当光线调制度η小于第一阈值η1时，仅使用正极性信号帧，通过调整信号放大因子β，使调制度为η；当光线调制度η大于第二阈值η2时，仅使用负极性信号帧， 通过调整信号放大因子β，使调制度为η；当调制度在第一阈值η1和第二阈值η2之间时，固定信号放大因子β，调节正极性信号比例为α+，负极性信号比例为α-，使正、负极性信号帧的加权平均值阈值等于η，即η＝α+η1+α-η2，其中α++α-＝1。
其中，在本发明的一个实施例中，第一阈值与第二阈值的确定准则为使时域信号切顶比例达到预设数值，或者使信号功率与切顶畸变功率和噪声功率之和的比值最大。预设数值可以根据实际情况进行设置。
也就是说，第一阈值η1和第二阈值η2的确定准则为：使时域信号切顶比例达到一定数值，优选地，切顶比例为1％。或者，第一阈值η1和第二阈值η2的确定准则为：使信号功率与切顶畸变功率和噪声功率之和的比值最大。
在步骤S103中，如图2所示，将正极性信号帧与负极性信号帧乘以信号帧放大因子，并根据所占比例进行混合复用以得到混合信号帧。
在步骤S104中，如图3所示，将混合信号帧中的负极性信号帧加上直流偏置，以得到待发送信号帧，在对待发送信号帧进行数模变换、变频、滤波之后控制可见光驱动电流，并得到可见光通信信号后发送。
进一步地，在本发明的一个实施例中，直流偏置的值小于或等于可见光线性区间的最大电流。
下面以具体实施例对本发明实施例的面向调光控制的可见光通信方法进行详细描述。
实施例1
本实施例具体公开一种面向调光控制的可见光通信方法，其中，信号调制方式为ACO-OFDM调制，该方法包括以下步骤：
S1：将待传输比特进行调制，产生正极性信号帧与负极性信号帧。
具体地，产生正极性信号帧，具体包括：待传输比特经过16QAM星座映射后得到能量归一化的星座映射符号Xk，构成Hermitian对称结构后，只在奇数子载波上传输数据，偶数子载波置零，串并转换得到长度为N的OFDM数据块后，进行快速傅里叶逆变换得到时域双极性信号xn，对双极性信号进行非对称限幅，以将双极性信号的负数部分置零，并保留所述双极性信号的正数部分，得到正极性信号帧
Figure PCTCN2016102207-appb-000001
进一步地，产生负极性信号帧，具体包括：待传输比特经过16QAM星座映射后得到能量归一化的星座映射符号Xk，构成Hermitian对称结构后，只在奇数子载波上传输数据， 偶数子载波置零，串并转换得到长度为N的OFDM数据块后，进行快速傅里叶逆变换得到时域双极性信号xn，对双极性信号进行非对称限幅，以将双极性信号的正数部分置零，并保留所述双极性信号的负数部分，得到负极性信号帧
Figure PCTCN2016102207-appb-000002
S2：根据所需光线调制度η确定正极性信号帧与负极性信号帧所占比例以及信号帧放大因子β。
其中，LED灯的光线调制度
Figure PCTCN2016102207-appb-000003
其中IL是LED灯的线性区间最小电流，IH是最大电流，ID是LED灯工作平均电流。
进一步地，能量归一化后的信号帧xn的平均功率为1，正极性信号帧
Figure PCTCN2016102207-appb-000004
和负极性信号帧
Figure PCTCN2016102207-appb-000005
的均方根
Figure PCTCN2016102207-appb-000006
信号帧放大因子β。
信号幅度需要Clipping的概率为：
Figure PCTCN2016102207-appb-000007
第一阈值η1和第二阈值η2的确定准则为：使时域信号切顶比例为2.3％，那么信号帧放大因子
Figure PCTCN2016102207-appb-000008
第一阈值
Figure PCTCN2016102207-appb-000009
第二阈值
Figure PCTCN2016102207-appb-000010
光线调制度η＝0.1，小于第一阈值η1时，正极性信号帧所占比例α+＝1，负极性信号帧所占比例α-＝0。
信号帧放大因子
Figure PCTCN2016102207-appb-000011
S3：将正极性信号帧乘以信号帧放大因子β，直接得到混合信号帧。
S4：将混合信号帧进行数模变换、变频、滤波等操作后，控制可见光驱动电流，并得到可见光通信信号后发送。
实施例2
本实施例具体公开一种面向调光控制的可见光通信方法，其中，信号调制方式为PAM-DMT调制，该方法包括以下步骤：
S1：将待传输比特进行调制，产生正极性信号帧与负极性信号帧。
具体地，产生正极性信号帧，具体包括：待传输比特按照PAM-DMT的调制方式调制，得到正极性信号帧
Figure PCTCN2016102207-appb-000012
进一步地，产生负极性信号帧，具体包括：待传输比特按照PAM-DMT的调制方式调制，将非对称限幅前的双极性信号，进行正数部分置零，保留所述双极性信号负数部分得到负极性信号帧
Figure PCTCN2016102207-appb-000013
S2：根据所需光线调制度η确定正极性信号帧与负极性信号帧所占比例以及信号帧放大因子β。
其中，LED灯的光线调制度
Figure PCTCN2016102207-appb-000014
其中IL是LED灯的线性区间最小电流，IH是最大电流，ID是LED灯工作平均电流。
进一步地，能量归一化后的信号帧xn的平均功率为1，正极性信号帧
Figure PCTCN2016102207-appb-000015
和负极性信号帧
Figure PCTCN2016102207-appb-000016
的均方根
Figure PCTCN2016102207-appb-000017
信号帧放大因子β。
信号幅度需要Clipping的概率为：
Figure PCTCN2016102207-appb-000018
第一阈值η1和第二阈值η2的确定准则是：使时域信号切顶比例为2.3％，那么信号帧放大因子
Figure PCTCN2016102207-appb-000019
第一阈值
Figure PCTCN2016102207-appb-000020
第二阈值
Figure PCTCN2016102207-appb-000021
光线调制度η＝0.5，大于第一阈值η1，小于第二阈值η2时，正极性信号帧所占比例α+＝0.5，负极性信号帧所占比例α-＝0.5。
信号帧放大因子
Figure PCTCN2016102207-appb-000022
S3：将正极性信号帧与负极性信号帧乘以信号帧放大因子β，根据所述所占比例混合复用正极性信号帧与负极性信号帧得到混合信号帧。
具体地，将正极性信号帧与负极性信号帧乘以放大因子β，按照正极性信号帧与负极性信号帧为1:1的比例混合复用，优选地，在每一个正极性信号帧后连接一个负极性信号帧，得到混合信号帧。
S4：将混合信号帧中的负极性信号帧加上直流偏置IH-IL，得到待发送信号帧，再进行数模变换、变频、滤波等操作后，控制可见光驱动电流，并得到可见光通信信号后发送。
实施例3
本实施例具体公开一种面向调光控制的可见光通信方法，其中，信号调制方式为HACO-OFDM调制，该方法包括以下步骤：
S1：将待传输比特进行调制，产生正极性信号帧与负极性信号帧。
具体地，产生正极性信号帧，具体包括：待传输比特按照HACO-OFDM的调制方式调制，得到正极性信号帧
Figure PCTCN2016102207-appb-000023
进一步地，产生负极性信号帧，具体包括：待传输比特按照HACO-OFDM的调制方式调制，将非对称限幅前的双极性信号，进行正数部分置零，保留所述双极性信号负数部分得到负极性信号帧
Figure PCTCN2016102207-appb-000024
S2：根据所需光线调制度η确定正极性信号帧与负极性信号帧所占比例以及信号帧放大因子β。
其中，LED灯的光线调制度
Figure PCTCN2016102207-appb-000025
其中IL是LED灯的线性区间最小电流，IH是最大电流，ID是LED灯工作平均电流。
进一步地，能量归一化后的信号帧xn的平均功率为1，正极性信号帧
Figure PCTCN2016102207-appb-000026
和负极性信号帧
Figure PCTCN2016102207-appb-000027
的均方根
Figure PCTCN2016102207-appb-000028
信号帧放大因子β。
第一阈值η1和第二阈值η2的确定准则是：使信号功率与切顶畸变功率P畸变和噪声功率 Pnoise之和的比值最大，那么信号帧放大因子
Figure PCTCN2016102207-appb-000029
第一阈值
Figure PCTCN2016102207-appb-000030
第二阈值η2＝1-η1。
光线调制度η大于第二阈值η2时，正极性信号帧所占比例α+＝0，负极性信号帧所占比例α-＝1。
信号帧放大因子
Figure PCTCN2016102207-appb-000031
S3：将负极性信号帧乘以信号帧放大因子β，直接得到混合信号帧。
S4：将混合信号帧中的负极性信号帧加上直流偏置IH-IL，得到待发送信号帧，再进行数模变换、变频、滤波等操作后，控制可见光驱动电流，并得到可见光通信信号后发送。
根据本发明实施例的面向调光控制的可见光通信方法，能够在可见光通信的同时兼顾照明调光控制，在不影响可见光通信条件下，能够实现大范围、精细化的调光控制，具有通信质量好、能量效率高等优势。
其次参照附图描述根据本发明实施例提出的面向调光控制的可见光通信装置。
图4是本发明一个实施例的面向调光控制的可见光通信装置的结构示意图。
如图4所示，该面向调光控制的可见光通信装置10包括：信号生成模块100、参数生成模块200、信号融合模块300和信号发送模块400。
其中，信号生成模块100用于对待传输比特进行调制得到正极性信号帧与负极性信号帧。参数生成模块200用于根据所需光线调制度确定正极性信号帧与负极性信号帧的所占比例与信号帧放大因子。信号融合模块300用于将正极性信号帧与负极性信号帧乘以信号帧放大因子，并根据所占比例进行混合复用以得到混合信号帧。信号发送模块400用于将混合信号帧中的负极性信号帧加上直流偏置，以得到待发送信号帧，在对所述待发送信号帧进行数模变换、变频、滤波之后控制可见光驱动电流，并得到可见光通信信号后发送。本发明实施例的装置10能够在可见光通信的同时兼顾照明调光控制，在不影响可见光通信条件下，能够实现大范围、精细化的调光控制，具有通信质量好、能量效率高等优势。
可选地，在本发明的一个实施例中，正极性信号帧可以为ACO-OFDM信号帧、PAM-DMT信号帧与HACO-OFDM信号帧中的一种。
进一步地，在本发明的一个实施例中，负极性信号帧可以为通过对ACO-OFDM信号帧、或者PAM-DMT信号帧、或者HACO-OFDM信号帧非对称限幅前的双极性信号进行 正数部分置零并保留双极性信号负数部分得到。
进一步地，在本发明的一个实施例中，直流偏置的值小于或等于可见光线性区间的最大电流。
进一步地，在本发明的一个实施例中，当所需光线调制度小于第一阈值时，仅使用正极性信号帧，并通过调整信号放大因子达到所需光线调制度；当所需光线调制度大于第二阈值时，仅使用负极性信号帧，并通过调整信号放大因子达到所需光线调制度；当光线调制度在第一阈值和第二阈值之间时，固定信号放大因子，调节正极性信号与负极性信号的比例，以使正极性信号帧与负极性信号帧的加权平均值等于所需光线调制度。需要说明的是，由于负极性信号帧的信号强度为负，负极性信号帧不可直接计算光线调制度，而是对偏置后的负极性信号帧和正极性信号帧进行加权，对于本领域的技术人员而言都是已知的，可以表述为负极性信号帧的加权平均值等于所需光线调制度。
其中，在本发明的一个实施例中，第一阈值与第二阈值的确定准则为使时域信号切顶比例达到预设数值，并且使信号功率与切顶畸变功率和噪声功率之和的比值最大。
需要说明的是，前述对面向调光控制的可见光通信方法实施例的解释说明也适用于该实施例的面向调光控制的可见光通信装置，此处不再赘述。
根据本发明实施例的面向调光控制的可见光通信装置，能够在可见光通信的同时兼顾照明调光控制，在不影响可见光通信条件下，能够实现大范围、精细化的调光控制，具有通信质量好、能量效率高等优势。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
尽管上面已经示出和描述了本发明的实施例，可以理解的是，上述实施例是示例性的，不能理解为对本发明的限制，本领域的普通技术人员在本发明的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (10)

  1. 一种面向调光控制的可见光通信方法，其特征在于，包括以下步骤：
    对待传输比特进行调制得到正极性信号帧与负极性信号帧；
    根据所需光线调制度确定所述正极性信号帧与负极性信号帧的所占比例与信号帧放大因子；
    将所述正极性信号帧与负极性信号帧乘以所述信号帧放大因子，并根据所述所占比例进行混合复用以得到混合信号帧；以及
    将所述混合信号帧中的负极性信号帧加上直流偏置，以得到待发送信号帧，在对所述待发送信号帧进行数模变换、变频、滤波之后控制可见光驱动电流，并得到可见光通信信号后发送。
  2. 如权利要求1所述的面向调光控制的可见光通信方法，其特征在于，所述正极性信号帧为ACO-OFDM信号帧、PAM-DMT信号帧与HACO-OFDM信号帧中的一种；所述负极性信号帧为通过对所述ACO-OFDM信号帧、或者所述PAM-DMT信号帧、或者所述HACO-OFDM信号帧非对称限幅前的双极性信号进行正数部分置零并保留所述双极性信号负数部分得到。
  3. 如权利要求1所述的面向调光控制的可见光通信方法，其特征在于，所述直流偏置的值小于或等于可见光线性区间的最大电流。
  4. 如权利要求1所述的面向调光控制的可见光通信方法，其特征在于，
    如果所述所需光线调制度小于第一阈值时，仅使用所述正极性信号帧，并通过调整所述信号放大因子达到所述所需光线调制度；
    如果所述所需光线调制度大于第二阈值时，仅使用所述负极性信号帧，并通过调整所述信号放大因子达到所述所需光线调制度；以及
    如果所述所需光线调制度在所述第一阈值和第二阈值之间时，固定所述信号放大因子，调节所述正极性信号帧与负极性信号帧的比例，以使所述正极性信号帧与负极性信号帧的加权平均值等于所述所需光线调制度。
  5. 如权利要求4所述的面向调光控制的可见光通信方法，其特征在于，所述第一阈值与所述第二阈值的确定准则为使时域信号切顶比例达到预设数值，或者使信号功率与切顶畸变功率和噪声功率之和的比值最大。
  6. 一种面向调光控制的可见光通信装置，其特征在于，包括：
    信号生成模块，用于对待传输比特进行调制得到正极性信号帧与负极性信号帧；
    参数生成模块，用于根据所需光线调制度确定所述正极性信号帧与负极性信号帧的所 占比例与信号帧放大因子；
    信号融合模块，用于将所述正极性信号帧与负极性信号帧乘以所述信号帧放大因子，并根据所述所占比例进行混合复用以得到混合信号帧；以及
    信号发送模块，用于将所述混合信号帧中的负极性信号帧加上直流偏置，以得到待发送信号帧，在对所述待发送信号帧进行数模变换、变频、滤波之后控制可见光驱动电流，并得到可见光通信信号后发送。
  7. 如权利要求6所述的面向调光控制的可见光通信装置，其特征在于，所述正极性信号帧为ACO-OFDM信号帧、PAM-DMT信号帧与HACO-OFDM信号帧中的一种；所述负极性信号帧为通过对所述ACO-OFDM信号帧、或者所述PAM-DMT信号帧、或者所述HACO-OFDM信号帧非对称限幅前的双极性信号进行正数部分置零并保留所述双极性信号负数部分得到。
  8. 如权利要求6所述的面向调光控制的可见光通信装置，其特征在于，所述直流偏置的值小于或等于可见光线性区间的最大电流。
  9. 如权利要求6所述的面向调光控制的可见光通信装置，其特征在于，
    当所述所需光线调制度小于第一阈值时，仅使用所述正极性信号帧，并通过调整所述信号放大因子达到所述所需光线调制度；
    当所述所需光线调制度大于第二阈值时，仅使用所述负极性信号帧，并通过调整所述信号放大因子达到所述所需光线调制度；以及
    当所述光线调制度在所述第一阈值和第二阈值之间时，固定所述信号放大因子，调节所述正极性信号帧与负极性信号帧的比例，以使所述正极性信号帧与负极性信号帧的加权平均值等于所述所需光线调制度。
  10. 如权利要求9所述的面向调光控制的可见光通信装置，其特征在于，所述第一阈值与所述第二阈值的确定准则为使时域信号切顶比例达到预设数值，或者使信号功率与切顶畸变功率和噪声功率之和的比值最大。
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