WO2017012452A1 - 融合ook调制和ofdm调制的可见光通信方法及装置 - Google Patents

融合ook调制和ofdm调制的可见光通信方法及装置 Download PDF

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WO2017012452A1
WO2017012452A1 PCT/CN2016/087319 CN2016087319W WO2017012452A1 WO 2017012452 A1 WO2017012452 A1 WO 2017012452A1 CN 2016087319 W CN2016087319 W CN 2016087319W WO 2017012452 A1 WO2017012452 A1 WO 2017012452A1
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signal
ook
ofdm
modulation
visible light
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杨昉
高俊男
丁文伯
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

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  • the present invention relates to the field of digital signal transmission technologies, and in particular, to a visible light communication method and apparatus for combining OOK modulation and OFDM modulation.
  • 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 wide spectrum, green energy saving, deep coverage, and organic integration with lighting, it has a good development prospect.
  • OOK modulation In visible light communication, commonly used modulation methods include OOK (On-Off Keying) modulation, PPM (Pulse Position Modulation) modulation, DMT (Discrete Multi-Tone) modulation, and OFDM. (Orthogonal Frequency Division Multiplex) modulation or the like.
  • OOK modulation is a modulation method that is simple to implement and has low circuit design complexity, and can realize low-cost and low data rate modulation.
  • OFDM modulation technology has the advantages of high spectral efficiency, flexible multiple access, and excellent performance. It can also resist multipath channel interference well and is a high data rate modulation method.
  • the existing method adopts multi-layer modulation, uses OOK modulation as the first layer modulation, uses OFDM modulation as the second layer modulation, and separates the two in the frequency domain by frequency division at the receiving end.
  • the OFDM signal is transmitted only when the OOK modulation transmits the "1" signal, and the OFDM signal is not transmitted when the OOK modulation transmits the "0" signal, and thus the channel resources are not fully utilized.
  • the present invention aims to solve at least one of the technical problems in the related art described above to some extent.
  • the method can combine OOK modulation and OFDM modulation to support demodulation of different types of receivers, and at the same time improve transmission rate and channel resource utilization.
  • a second object of the present invention is to provide a visible light communication device incorporating OOK modulation and OFDM modulation.
  • a third object of the present invention is to provide an apparatus.
  • a fourth object of the present invention is to provide a nonvolatile computer storage medium.
  • an embodiment of the first aspect of the present invention provides a visible light communication method for combining OOK modulation and OFDM modulation, including the following steps: S1: receiving an externally provided OOK signal to be fused and an OFDM signal to be fused; S2: time synchronization of the OOK signal and the OFDM signal; S3: performing signal superposition on the time-synchronized OOK signal and the OFDM signal to obtain a superimposed signal, wherein the signal superposition is: determining the OOK signal Logic state, when the logic state of the OOK signal is 1, the positive signal of the corresponding OFDM signal is set to zero, the negative signal is unchanged, and the obtained non-positive OFDM signal is loaded to a logic state of 1.
  • the visible light communication method combining the OOK modulation and the OFDM modulation can combine OOK modulation and OFDM modulation, that is, support low-frequency low data rate modulation, support OFDM modulation with high spectral efficiency, and support different types.
  • the demodulation of the receiver can simultaneously improve the transmission rate and channel resource utilization. At the same time, the method can avoid the problem that the signal amplitude is too high and the channel resource utilization is insufficient when the signals are superimposed.
  • the visible light communication method combining the OOK modulation and the OFDM modulation according to the above-described embodiments of the present invention may further have the following additional technical features:
  • the OFDM signal to be fused transmits data only on odd subcarriers, and even subcarriers are set to zero.
  • the OFDM signal to be fused satisfies a Hermitian symmetric structure.
  • the duration of a single logic state of the OOK signal to be fused is greater than the duration of the OFDM signal frame.
  • the duration of a single logic state of the OOK signal to be fused is an integer multiple of the duration of the OFDM signal frame.
  • the time synchronization in step S2 specifically includes: synchronizing with a 50 Hz or 60 Hz power frequency signal on the power line when the OOK signal and the OFDM signal source clock are not synchronized.
  • the time synchronization in step S2 further includes performing step S3 when the OOK signal and the OFDM signal source clock are synchronized.
  • the maximum amplitude of the OFDM signal is less than or equal to the amplitude of the OOK signal.
  • the visible light communication signal has a minimum signal amplitude of zero and a maximum signal amplitude of the LED maximum linear operating current.
  • an embodiment of the second aspect of the present invention further provides a visible light communication device that combines OOK modulation and OFDM modulation, and includes: a signal receiving module, configured to receive an externally provided OOK signal to be fused and to be fused.
  • An OFDM signal configured to time synchronize the OOK signal and the OFDM signal, and a signal fusion module that superimposes the time-synchronized OOK signal and the OFDM signal to obtain a superimposed signal, where the signal is superimposed
  • the method is: determining a logic state of the OOK signal, when the logic state of the OOK signal is 1, setting a positive signal of the corresponding OFDM signal to zero, a negative signal is unchanged, and the obtained non-positive
  • the OFDM signal is loaded onto the OOK signal with a logic state of 1.
  • the signal sending module is configured to modulate the superimposed signal onto the visible light drive current to obtain visible light Signal, and transmitting the visible light communication signal.
  • the visible light communication device combining OOK modulation and OFDM modulation can combine OOK modulation and OFDM modulation, that is, support low-frequency low data rate modulation, support OFDM modulation with high spectral efficiency, and support different types.
  • the demodulation of the receiver can simultaneously improve the transmission rate and channel resource utilization. At the same time, the device can avoid the problem that the signal amplitude is too high and the channel resource utilization is insufficient when the signals are superimposed.
  • an embodiment of a third aspect of the present invention further provides an apparatus comprising: one or more processors; a memory; one or more programs, the one or more programs being stored in the memory
  • an embodiment of a fourth aspect of the present invention further provides a nonvolatile computer storage medium storing one or more programs when the one or more programs are one device When executed, the apparatus is caused to perform the visible light communication method of the fused OOK modulation and the OFDM modulation of the above-described embodiments of the present invention.
  • FIG. 1 is a flow chart of a method of visible light communication incorporating OOK modulation and OFDM modulation, in accordance with one embodiment of the present invention
  • FIG. 2 is a schematic diagram of signals to be fused in a visible light communication method combining OOK modulation and OFDM modulation according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of signal fusion in a visible light communication method incorporating OOK modulation and OFDM modulation according to an embodiment of the present invention
  • FIG. 4 is a block diagram showing the structure of a visible light communication device incorporating OOK modulation and OFDM modulation, in accordance with one embodiment of the present invention.
  • FIG. 1 is a flow chart of a method of visible light communication incorporating OOK modulation and OFDM modulation, in accordance with one embodiment of the present invention. As shown in Figure 1, the method includes the following steps:
  • Step S1 Receive an externally provided OOK signal to be fused and an OFDM signal to be fused, such as shown in FIG. 2.
  • the OFDM signal to be fused transmits data only on odd subcarriers, and the even subcarriers are set to zero.
  • the OFDM signal to be fused satisfies the Hermitian symmetric structure.
  • the duration of a single logic state (eg, 0 or 1) of the OOK signal to be fused is greater than the duration of the OFDM signal frame. More specifically, the duration of a single logic state (such as 0 or 1) of the OOK signal to be fused is an integer multiple of the duration of the OFDM signal frame.
  • Step S2 Time synchronization of the OOK signal and the OFDM signal.
  • step S2 specifically, when the OOK signal and the OFDM signal source clock are not synchronized, synchronization is performed by using a 50 Hz or 60 Hz power frequency signal on the power line. Further, when the OOK signal is synchronized with the OFDM signal source clock, step S3 is performed.
  • Step S3 performing signal superposition on the time-synchronized OOK signal and the OFDM signal to obtain a superimposed signal, wherein the signal superposition is: determining the logic state of the OOK signal, and the logic state of the OOK signal includes, for example, 0 and 1, when OOK When the logic state of the signal is 1, the positive signal of the corresponding OFDM signal is set to zero, the negative signal is unchanged, and the obtained non-positive OFDM signal is loaded onto the OOK signal with logic state of 1, when the logic state of the OOK signal When 0, the negative signal of the corresponding OFDM signal is set to zero, the positive signal is unchanged, and the obtained non-negative OFDM is obtained.
  • the signal is loaded onto the OOK signal with a logic state of 0, such as shown in Figure 3.
  • Step S4 Modulating the superimposed signal onto the visible light driving current to obtain a visible light communication signal, and transmitting the visible light communication signal.
  • the minimum visible signal amplitude of the obtained visible light communication signal is 0, and the maximum signal amplitude is the maximum linear operating current of the LED.
  • the visible light communication method of the fusion OOK modulation and OFDM modulation of the present invention comprises the following steps:
  • Step 1 Receive an externally provided OOK signal to be fused and an OFDM signal to be fused, including:
  • the received OOK signal to be fused is a binary pulse sequence, wherein the pulse is "1", the pulse is "0", and the amplitude is 1, which can be expressed as
  • a k is a binary symbol sequence, and the value is 1 or 0
  • N 1 is the length of the logical state of the OOK signal (for example, 0 or 1)
  • g[n] is a rectangular window sequence
  • k represents the first few Logic status.
  • the received OFDM signal to be fused includes: after the data is mapped by the 16QAM constellation, the constellation mapping symbol is obtained, and after the Hermitian symmetric structure is formed, the data is transmitted only on the odd subcarriers, the even subcarriers are set to zero, and the serial and parallel conversion is performed, and the IFF is performed.
  • the transform yields a time domain signal and the amplitude of the OFDM signal is less than one.
  • N 2 288 is the OFDM signal frame length, where the number of subcarriers is 256, the cyclic prefix length is 32; x[n] is the OFDM time domain signal, and k represents the first few frames.
  • Step 2 Time synchronization of the OOK signal and the OFDM signal, specifically including:
  • the OOK signal s 1 [n] and the OFDM signal s 2 [n] source clocks are not synchronized, and are synchronized using a 50 Hz power frequency signal on the power line.
  • Step 3 superimposing the time-synchronized OOK signal and the OFDM signal to obtain a superimposed signal, wherein the signal superposition is: determining the logical state of the OOK signal, and when the logic state of the OOK signal is 1, the corresponding The positive signal of the OFDM signal is set to zero, the negative signal is unchanged, and the obtained non-positive OFDM signal is loaded onto the OOK signal with a logic state of 1.
  • the corresponding OFDM signal is The negative signal is set to zero, the positive signal is unchanged, and the obtained non-negative OFDM signal is loaded onto the OOK signal with a logic state of 0, specifically:
  • the OOK signal is s 1 [n]
  • the OFDM signal is s 2 [n]
  • the superimposed signal is s[n].
  • the OFDM signal is operated as follows:
  • Step 4 Modulate the superimposed signal onto the visible light drive current to obtain the visible light communication signal, and then transmit the visible light communication signal.
  • the minimum signal amplitude of the visible light communication signal is 0, and the maximum signal amplitude is the maximum linear operating current of the LED, which is 1 in this embodiment.
  • the visible light communication method of the fusion OOK modulation and OFDM modulation of the present invention comprises the following steps:
  • Step 1 Receive an externally provided OOK signal to be fused and an OFDM signal to be fused, including:
  • the received OOK signal to be fused is a binary pulse sequence, wherein the pulse is "1", the pulse is "0", and the amplitude is 1, which can be expressed as
  • a k is a binary symbol sequence, and the value is 1 or 0
  • N 1 is the length of the logical state of the OOK signal
  • g[n] is a rectangular window sequence
  • k represents the first logic state.
  • the received OFDM signal to be fused includes: after the data is mapped by the 64QAM constellation, the constellation mapping symbol is obtained, and after the Hermitian symmetric structure is formed, the data is transmitted only on the odd subcarriers, the even subcarriers are set to zero, and the serial and parallel conversion is performed, and the IFF is performed.
  • the transform yields a time domain signal and the amplitude of the OFDM signal is less than one.
  • N 2 543 is the OFDM signal frame length, where the number of subcarriers is 512, the length of the training sequence is 31; x[n] is the OFDM time domain signal, and k represents the first few frames.
  • Step 2 Time synchronization of the OOK signal and the OFDM signal, specifically including:
  • the OOK signal s 1 [n] is synchronized with the OFDM signal s 2 [n] source clock to directly perform signal fusion.
  • Step 3 superimposing the time-synchronized OOK signal and the OFDM signal to obtain a superimposed signal, wherein the signal superposition is: determining the logical state of the OOK signal, and when the logic state of the OOK signal is 1, the corresponding The positive signal of the OFDM signal is set to zero, the negative signal is unchanged, and the obtained non-positive OFDM signal is loaded onto the OOK signal with a logic state of 1.
  • the corresponding OFDM signal is negative.
  • the signal is set to zero, the positive signal is unchanged, and the obtained non-negative OFDM signal is loaded onto the OOK signal with a logic state of 0, specifically:
  • the OOK signal is s 1 [n]
  • the OFDM signal is s 2 [n]
  • the superimposed signal is s[n].
  • the OFDM signal is operated as follows:
  • Step 4 The superimposed signal is modulated onto the visible light driving current to obtain a visible light communication signal, wherein the minimum signal amplitude of the visible light modulated signal is 0, and the maximum signal amplitude is the maximum linear operating current of the LED, which is 1 in this embodiment.
  • the visible light communication method combining OOK modulation and OFDM modulation can combine OOK modulation and OFDM modulation, that is, support low-frequency low-rate modulation while supporting OFDM modulation with high spectral efficiency, and It supports demodulation of different types of receivers while improving transmission rate and channel resource utilization.
  • the method can avoid the problem that the signal amplitude is too high and the channel resource utilization is insufficient when the signals are superimposed.
  • a further embodiment of the present invention also provides a visible light communication device incorporating OOK modulation and OFDM modulation.
  • the apparatus 400 includes a signal receiving module 410, a signal synchronization module 420, a signal fusion module 430, and a signal sending module 440.
  • the signal receiving module 410 is configured to receive an externally provided OOK signal to be fused and an OFDM signal to be fused.
  • the signal synchronization module 420 is configured to time synchronize the OOK signal and the OFDM signal.
  • the signal fusion module 430 superimposes the time-synchronized OOK signal and the OFDM signal to obtain a superimposed signal, wherein the signal is superimposed by determining the logic state of the OOK signal, and the logic state of the OOK signal includes, for example, 0 and 1.
  • the signal transmitting module 440 is configured to modulate the superimposed signal onto the visible light driving current to obtain a visible light communication signal, and transmit the visible light communication signal.
  • the specific implementation manner of the visible light communication device 400 combining the OOK modulation and the OFDM modulation in the embodiment of the present invention is similar to the specific implementation manner of the visible light communication method combining the OOK modulation and the OFDM modulation in the embodiment of the present invention, and thus For a specific description, please refer to the description of the method part. To reduce redundancy, no further details are provided here.
  • a visible light communication device incorporating OOK modulation and OFDM modulation can combine OOK modulation and OFDM modulation, that is, support low-frequency low data rate modulation while supporting OFDM modulation with high spectral efficiency, and It supports demodulation of different types of receivers while improving transmission rate and channel resource utilization.
  • the device can avoid the problem that the signal amplitude is too high and the channel resource utilization is insufficient when the signals are superimposed.
  • 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

本发明提出一种融合OOK调制和OFDM调制的可见光通信方法及装置，该方法包括以下步骤：接收外部提供的待融合的OOK信号和待融合的OFDM信号；将OOK信号和OFDM信号进行时间同步；对时间同步后的OOK信号和OFDM信号进行信号叠加，以得到叠加信号，其中，信号叠加的方式为：当OOK信号为1时，将对应的OFDM信号的正信号置零，负信号不变，并将得到的非正的OFDM信号加载到为1的OOK信号上，当OOK信号为0时，将对应的OFDM信号的负信号置零，正信号不变，并将得到的非负的OFDM信号加载到为0的OOK信号上；将叠加信号调制到可见光驱动电流上，以得到可见光通信信号并发送。本发明的方法能够融合OOK调制和OFDM调制，支持不同类型接收机的解调，同时能够提高传输速率与信道资源利用率。

Description

融合OOK调制和OFDM调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2015年7月17日提交的、发明名称为“融合OOK调制和OFDM调制的可见光通信方法及装置”的、中国专利申请号为“201510425084.8”的优先权。
技术领域
本发明涉及数字信号传输技术领域，特别涉及一种融合OOK调制和OFDM调制的可见光通信方法及装置。
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。
可见光通信中，常用的调制方式有OOK(On-Off Keying，二进制启闭键控)调制、PPM(Pulse Position Modulation，脉冲位置调制)调制、DMT(Discrete Multi-Tone，离散多音频)调制以及OFDM(Orthogonal Frequency Division Multiplex，正交频分复用)调制等。其中，OOK调制是一种实现简单、电路设计复杂度低的调制方式，能够实现低成本低数据率调制。OFDM调制技术具有频谱效率高、灵活多址、性能优异的优点，同时可以很好地对抗多径信道干扰，是一种高数据率调制方式。
为了将两种调制方法融合到一起，使得在低数据率传输的同时也能支持高数据率传输。现有方法采用多层调制，利用OOK调制作为第一层调制，利用OFDM调制作为第二层调制，在接收端通过频分的方式在频域将两者分开。
然而，一方面，由于OOK调制深度通常比较大，在OOK调制的脉冲“1”上加载正的OFDM信号，容易使信号幅度过大，进入系统非线性区，产生截顶的现象，恶化系统性能。另一方面，现有的方法，只在OOK调制发送“1”信号时，传输OFDM信号，在OOK调制发送“0”信号时不发送OFDM信号，因而，没有充分利用信道资源。
发明内容
本发明旨在至少在一定程度上解决上述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融合OOK调制和OFDM调制的可见光通信方 法，该方法能够融合OOK调制和OFDM调制，支持不同类型接收机的解调，同时能够提高传输速率与信道资源利用率。
本发明的第二个目的在于提供一种融合OOK调制和OFDM调制的可见光通信装置。
本发明的第三个目的在于提供一种设备。
本发明的第四个目的在于提供一种非易失性计算机存储介质。
为了实现上述目的，本发明第一方面的实施例提出了一种融合OOK调制和OFDM调制的可见光通信方法，包括以下步骤：S1：接收外部提供的待融合的OOK信号和待融合的OFDM信号；S2：将所述OOK信号和OFDM信号进行时间同步；S3：对时间同步后的所述OOK信号和OFDM信号进行信号叠加，以得到叠加信号，其中，信号叠加的方式为：判断所述OOK信号的逻辑状态，当所述OOK信号的逻辑状态为1时，将对应的所述OFDM信号的正信号置零，负信号不变，并将得到的非正的OFDM信号加载到逻辑状态为1的所述OOK信号上，当所述OOK信号的逻辑状态为0时，将对应的所述OFDM信号的负信号置零，正信号不变，并将得到的非负的OFDM信号加载到逻辑状态为0的所述OOK信号上；S4：将所述叠加信号调制到可见光驱动电流上，以得到可见光通信信号，并发送所述可见光通信信号。
根据本发明实施例的融合OOK调制和OFDM调制的可见光通信方法，能够融合OOK调制和OFDM调制，即在支持低成本低数据率调制的同时，支持频谱效率较高的OFDM调制，且支持不同类型接收机的解调，同时能够提高传输速率与信道资源利用率。同时，该方法能避免信号叠加时的信号幅度过高、信道资源利用率不足的问题。
另外，根据本发明上述实施例的融合OOK调制和OFDM调制的可见光通信方法还可以具有如下附加的技术特征：
在一些示例中，所述待融合的OFDM信号只在奇数子载波上传输数据，偶数子载波置零。
在一些示例中，所述待融合的OFDM信号满足Hermitian对称结构。
在一些示例中，所述待融合的OOK信号的单个逻辑状态的持续时长大于所述OFDM信号帧时长。
在一些示例中，所述待融合的OOK信号的单个逻辑状态的持续时长为所述OFDM信号帧时长的整数倍。
在一些示例中，所述步骤S2中的时间同步具体包括：当所述OOK信号和OFDM信号来源时钟不同步时，利用电力线上的50Hz或60Hz工频信号进行同步。
在一些示例中，所述步骤S2中的时间同步，进一步包括：当所述OOK信号和OFDM信号来源时钟同步时，执行所述步骤S3。
在一些示例中，在所述步骤S3中，所述OFDM信号的最大幅度小于或等于所述OOK信号的幅度。
在一些示例中，所述可见光通信信号的最小信号幅度为0，最大信号幅度为LED最大线性工作电流。
为了实现上述目的，本发明第二方面的实施例还提供了一种融合OOK调制和OFDM调制的可见光通信装置，包括：信号接收模块，用于接收外部提供的待融合的OOK信号和待融合的OFDM信号；信号同步模块，用于将所述OOK信号和OFDM信号进行时间同步；信号融合模块，对时间同步后的所述OOK信号和OFDM信号进行信号叠加，以得到叠加信号，其中，信号叠加的方式为：判断所述OOK信号的逻辑状态，当所述OOK信号的逻辑状态为1时，将对应的所述OFDM信号的正信号置零，负信号不变，并将得到的非正的OFDM信号加载到逻辑状态为1的所述OOK信号上，当所述OOK信号的逻辑状态为0时，将对应的所述OFDM信号的负信号置零，正信号不变，并将得到的非负的OFDM信号加载到逻辑状态为0的所述OOK信号上；信号发送模块，用于将所述叠加信号调制到可见光驱动电流上，以得到可见光通信信号，并发送所述可见光通信信号。
根据本发明实施例的融合OOK调制和OFDM调制的可见光通信装置，能够融合OOK调制和OFDM调制，即在支持低成本低数据率调制的同时，支持频谱效率较高的OFDM调制，且支持不同类型接收机的解调，同时能够提高传输速率与信道资源利用率。同时，该装置能避免信号叠加时的信号幅度过高、信道资源利用率不足的问题。
为了实现上述目的，本发明第三方面的实施例还提供了一种设备，包括：一个或者多个处理器；存储器；一个或者多个程序，所述一个或者多个程序存储在所述存储器中，当被所述一个或者多个处理器执行时，执行本发明上述实施例的融合OOK调制和OFDM调制的可见光通信方法。
为了实现上述目的，本发明第四方面的实施例的还提供一种非易失性计算机存储介质，所述计算机存储介质存储有一个或者多个程序，当所述一个或者多个程序被一个设备执行时，使得所述设备执行本发明上述实施例的融合OOK调制和OFDM调制的可见光通信方法。
本发明的附加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
本发明的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：
图1是根据本发明一个实施例的融合OOK调制和OFDM调制的可见光通信方法的流程图；
图2是根据本发明一个实施例的融合OOK调制和OFDM调制的可见光通信方法中的待融合信号示意图；
图3是根据本发明一个实施例融合OOK调制和OFDM调制的可见光通信方法中的信号融合示意图；以及
图4是根据本发明一个实施例的融合OOK调制和OFDM调制的可见光通信装置的结构框图。
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，仅用于解释本发明，而不能理解为对本发明的限制。
以下结合附图描述根据本发明实施例的融合OOK调制和OFDM调制的可见光通信方法及装置。
图1是根据本发明一个实施例的融合OOK调制和OFDM调制的可见光通信方法的流程图。如图1所示，该方法包括以下步骤：
步骤S1：接收外部提供的待融合的OOK信号和待融合的OFDM信号，例如图2所示。其中，在本发明的一个实施例中，待融合的OFDM信号只在奇数子载波上传输数据，偶数子载波置零。并且，待融合的OFDM信号满足Hermitian对称结构。进一步地，在一些示例中，待融合的OOK信号的单个逻辑状态(如0或1)的持续时长大于OFDM信号帧时长。更为具体地，待融合的OOK信号的单个逻辑状态(如0或1)的持续时长为OFDM信号帧时长的整数倍。
步骤S2：将OOK信号和OFDM信号进行时间同步。在本发明的一个实施例中，在该步骤S2中，具体包括：当OOK信号和OFDM信号来源时钟不同步时，利用电力线上的50Hz或60Hz工频信号进行同步。进一步地，当OOK信号和OFDM信号来源时钟同步时，执行步骤S3。
步骤S3：对时间同步后的OOK信号和OFDM信号进行信号叠加，以得到叠加信号，其中，信号叠加的方式为：判断OOK信号的逻辑状态，OOK信号的逻辑状态例如包括0和1，当OOK信号的逻辑状态为1时，将对应的OFDM信号的正信号置零，负信号不变，并将得到的非正的OFDM信号加载到逻辑状态为1的OOK信号上，当OOK信号的逻辑状态为0时，将对应的OFDM信号的负信号置零，正信号不变，并将得到的非负的OFDM 信号加载到逻辑状态为0的OOK信号上，例如图3所示。
步骤S4：将叠加信号调制到可见光驱动电流上，以得到可见光通信信号，并发送可见光通信信号。其中，在本发明的一个实施例中，例如，得到的可见光通信信号的最小信号幅度为0，最大信号幅度为LED最大线性工作电流。
为了便于理解，以下结合附图和具体的实施例1和实施例2，对本发明上述实施例的融合OOK调制和OFDM调制的可见光通信方法进行进一步详细地描述。
实施例1
在本实施例中，本发明的融合OOK调制和OFDM调制的可见光通信方法包括以下步骤：
步骤1：接收外部提供的待融合的OOK信号和待融合的OFDM信号，具体包括：
接收的待融合的OOK信号为二进制脉冲序列，其中有脉冲为“1”，无脉冲为“0”，幅度为1，可以表示为
Figure PCTCN2016087319-appb-000001
该式中，ak为二进制码元序列，取值为1或者0；N1为OOK信号的逻辑状态(例如为0或1)的长度；g[n]为矩形窗序列；k代表第几个逻辑状态。
接收的待融合的OFDM信号，具体包括：数据经过16QAM星座映射后得到星座映射符号，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，串并转换后，进行IFF变换得到时域信号，并且OFDM信号的幅度小于1。采用CP-OFDM作为调制技术，待融合的OFDM信号可以表示为
Figure PCTCN2016087319-appb-000002
式中N2＝288为OFDM信号帧长度，其中子载波数为256，循环前缀长度为32；x[n]为OFDM时域信号，k代表第几帧。
其中，OOK信号的逻辑状态的长度N1为OFDM信号帧长度N2的2倍，即N1＝2N2＝576。
步骤2：将OOK信号和OFDM信号进行时间同步，具体包括：
OOK信号s1[n]和OFDM信号s2[n]来源时钟不同步，利用电力线上的50Hz工频信号进行同步。
步骤3：对时间同步后的OOK信号和OFDM信号进行信号叠加，以得到叠加信号，其中，信号叠加的方式为：判断OOK信号的逻辑状态，当OOK信号的逻辑状态为1时，将对应的OFDM信号的正信号置零，负信号不变，并将得到的非正的OFDM信号加载到逻辑状态为1的OOK信号上，当OOK信号的逻辑状态为0时，将对应的OFDM信号的 负信号置零，正信号不变，并将得到的非负的OFDM信号加载到逻辑状态为0的OOK信号上，具体为：
OOK信号为s1[n]，OFDM信号为s2[n]，叠加信号为s[n]。
当OOK信号s1[n]＝1，对OFDM信号s2[n]进行如下操作：
Figure PCTCN2016087319-appb-000003
当OOK信号s1[n]＝0，对OFDM信号进行如下操作：
Figure PCTCN2016087319-appb-000004
其中，叠加信号s[n]满足
Figure PCTCN2016087319-appb-000005
步骤4：将叠加信号调制到可见光驱动电流上，得到可见光通信信号后发送该可见光通信信号。其中，可见光通信信号的最小信号幅度为0，其最大信号幅度为LED最大线性工作电流，本实施例中为1。
实施例2
在本实施例中，本发明的融合OOK调制和OFDM调制的可见光通信方法包括以下步骤：
步骤1：接收外部提供的待融合的OOK信号和待融合的OFDM信号，具体包括：
接收的待融合的OOK信号为二进制脉冲序列，其中有脉冲为“1”，无脉冲为“0”，幅度为1，可以表示为
Figure PCTCN2016087319-appb-000006
该式中，ak为二进制码元序列，取值为1或者0；N1为OOK信号的逻辑状态的长度；g[n]为矩形窗序列；k代表第几个逻辑状态。
接收的待融合的OFDM信号，具体包括：数据经过64QAM星座映射后得到星座映射符号，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，串并转换后，进行IFF变换得到时域信号，并且OFDM信号的幅度小于1。采用TDS-OFDM作为调制技术，待融合的OFDM信号可以表示为
Figure PCTCN2016087319-appb-000007
式中N2＝543为OFDM信号帧长度，其中子载波数为512，训练序列长度为31；x[n]为OFDM时域信号，k代表第几帧。
其中，OOK信号的逻辑状态的长度N1与OFDM信号帧长度N2相等，即N1＝N2＝543。
步骤2：将OOK信号和OFDM信号进行时间同步，具体包括：
OOK信号s1[n]和OFDM信号s2[n]来源时钟同步，直接进行信号融合。
步骤3：对时间同步后的OOK信号和OFDM信号进行信号叠加，以得到叠加信号，其中，信号叠加的方式为：判断OOK信号的逻辑状态，当OOK信号的逻辑状态为1时，将对应的OFDM信号的正信号置零，负信号不变，并将得到的非正的OFDM信号加载到逻辑状态为1的OOK信号上，当OOK信号的逻辑状态为0时，将对应的OFDM信号的负信号置零，正信号不变，并将得到的非负的OFDM信号加载到逻辑状态为0的OOK信号上，具体为：
OOK信号为s1[n]，OFDM信号为s2[n]，叠加信号为s[n]。
当OOK信号s1[n]＝1，对OFDM信号s2[n]进行如下操作：
Figure PCTCN2016087319-appb-000008
当OOK信号s1[n]＝0，对OFDM信号进行如下操作：
Figure PCTCN2016087319-appb-000009
其中，叠加信号s[n]满足
Figure PCTCN2016087319-appb-000010
步骤4：将叠加信号调制到可见光驱动电流上，得到可见光通信信号后发送，其中，可见光调制信号的最小信号幅度为0，其最大信号幅度为LED最大线性工作电流，本实施例中为1。
综上，根据本发明实施例的融合OOK调制和OFDM调制的可见光通信方法，能够融合OOK调制和OFDM调制，即在支持低成本低数据率调制的同时，支持频谱效率较高的OFDM调制，且支持不同类型接收机的解调，同时能够提高传输速率与信道资源利用率。同时，该方法能避免信号叠加时的信号幅度过高、信道资源利用率不足的问题。
本发明的进一步实施例还提供了一种融合OOK调制和OFDM调制的可见光通信装置。
图4是根据本发明一个实施例的融合OOK调制和OFDM调制的可见光通信装置的结构框图。如图4所示，该装置400包括：信号接收模块410、信号同步模块420、信号融合模块430和信号发送模块440。
其中，信号接收模块410用于接收外部提供的待融合的OOK信号和待融合的OFDM信号。信号同步模块420用于将OOK信号和OFDM信号进行时间同步。信号融合模块430对时间同步后的OOK信号和OFDM信号进行信号叠加，以得到叠加信号，其中，信号叠加的方式为：判断OOK信号的逻辑状态，OOK信号的逻辑状态例如包括0和1。当OOK 信号的逻辑状态为1时，将对应的OFDM信号的正信号置零，负信号不变，并将得到的非正的OFDM信号加载到逻辑状态为1的OOK信号上，当OOK信号的逻辑状态为0时，将对应的OFDM信号的负信号置零，正信号不变，并将得到的非负的OFDM信号加载到逻辑状态为0的OOK信号上。信号发送模块440用于将叠加信号调制到可见光驱动电流上，以得到可见光通信信号，并发送可见光通信信号。
需要说明的是，本发明实施例的融合OOK调制和OFDM调制的可见光通信装置400的具体实现方式与本发明实施例的融合OOK调制和OFDM调制的可见光通信方法的具体实现方式类似，因此对于其具体地示例性描述请参见方法部分的描述，为了减少冗余，此处不再赘述。
综上，根据本发明实施例的融合OOK调制和OFDM调制的可见光通信装置，能够融合OOK调制和OFDM调制，即在支持低成本低数据率调制的同时，支持频谱效率较高的OFDM调制，且支持不同类型接收机的解调，同时能够提高传输速率与信道资源利用率。同时，该装置能避免信号叠加时的信号幅度过高、信道资源利用率不足的问题。
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 (12)

  1. 一种融合OOK调制和OFDM调制的可见光通信方法，其特征在于，包括以下步骤：
    S1：接收外部提供的待融合的OOK信号和待融合的OFDM信号；
    S2：将所述OOK信号和OFDM信号进行时间同步；
    S3：对时间同步后的所述OOK信号和OFDM信号进行信号叠加，以得到叠加信号，其中，信号叠加的方式为：判断所述OOK信号的逻辑状态，当所述OOK信号的逻辑状态为1时，将对应的OFDM信号的正信号置零，负信号不变，并将得到的非正的OFDM信号加载到逻辑状态为1的所述OOK信号上，当所述OOK信号的逻辑状态为0时，将对应的所述OFDM信号的负信号置零，正信号不变，并将得到的非负的OFDM信号加载到逻辑状态为0的所述OOK信号上；
    S4：将所述叠加信号调制到可见光驱动电流上，以得到可见光通信信号，并发送所述可见光通信信号。
  2. 根据权利要求1所述的融合OOK调制和OFDM调制的可见光通信方法，其特征在于，所述待融合的OFDM信号只在奇数子载波上传输数据，偶数子载波置零。
  3. 根据权利要求1所述的融合OOK调制和OFDM调制的可见光通信方法，其特征在于，所述待融合的OFDM信号满足Hermitian对称结构。
  4. 根据权利要求1所述的融合OOK调制和OFDM调制的可见光通信方法，其特征在于，所述待融合的OOK信号的单个逻辑状态的持续时长大于所述OFDM信号帧时长。
  5. 根据权利要求1或4所述的融合OOK调制和OFDM调制的可见光通信方法，其特征在于，所述待融合的OOK信号的单个逻辑状态的持续时长为所述OFDM信号帧时长的整数倍。
  6. 根据权利要求1所述的融合OOK调制和OFDM调制的可见光通信方法，其特征在于，所述步骤S2中的时间同步具体包括：
    当所述OOK信号和OFDM信号来源时钟不同步时，利用电力线上的50Hz或60Hz工频信号进行同步。
  7. 根据权利要求1所述的融合OOK调制和OFDM调制的可见光通信方法，其特征在于，所述步骤S2中的时间同步，进一步包括：
    当所述OOK信号和OFDM信号来源时钟同步时，执行所述步骤S3。
  8. 根据权利要求1所述的融合OOK调制和OFDM调制的可见光通信方法，其特征在于，在所述步骤S3中，所述OFDM信号的最大幅度小于或等于所述OOK信号的幅度。
  9. 根据权利要求1所述的融合OOK调制和OFDM调制的可见光通信方法，其特征在 于，所述可见光通信信号的最小信号幅度为0，最大信号幅度为LED最大线性工作电流。
  10. 一种融合OOK调制和OFDM调制的可见光通信装置，其特征在于，包括：
    信号接收模块，用于接收外部提供的待融合的OOK信号和待融合的OFDM信号；
    信号同步模块，用于将所述OOK信号和OFDM信号进行时间同步；
    信号融合模块，对时间同步后的所述OOK信号和OFDM信号进行信号叠加，以得到叠加信号，其中，信号叠加的方式为：判断所述OOK信号的逻辑状态，当所述OOK信号的逻辑状态为1时，将对应的所述OFDM信号的正信号置零，负信号不变，并将得到的非正的OFDM信号加载到逻辑状态为1的所述OOK信号上，当所述OOK信号的逻辑状态为0时，将对应的所述OFDM信号的负信号置零，正信号不变，并将得到的非负的OFDM信号加载到逻辑状态为0的所述OOK信号上；
    信号发送模块，用于将所述叠加信号调制到可见光驱动电流上，以得到可见光通信信号，并发送所述可见光通信信号。
  11. 一种设备，其特征在于，包括：
    一个或者多个处理器；
    存储器；
    一个或者多个程序，所述一个或者多个程序存储在所述存储器中，当被所述一个或者多个处理器执行时，执行如权利要求1-9任一项所述的融合OOK调制和OFDM调制的可见光通信方法。
  12. 一种非易失性计算机存储介质，其特征在于，所述计算机存储介质存储有一个或者多个程序，当所述一个或者多个程序被一个设备执行时，使得所述设备执行如权利要求1-9任一项所述的融合OOK调制和OFDM调制的可见光通信方法。
PCT/CN2016/087319 2015-07-17 2016-06-27 融合ook调制和ofdm调制的可见光通信方法及装置 Ceased WO2017012452A1 (zh)

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