WO2007093097A1 - Système de communication sans fil utilisant la lumière d'éclairage - Google Patents

Système de communication sans fil utilisant la lumière d'éclairage Download PDF

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Publication number
WO2007093097A1
WO2007093097A1 PCT/CN2006/002702 CN2006002702W WO2007093097A1 WO 2007093097 A1 WO2007093097 A1 WO 2007093097A1 CN 2006002702 W CN2006002702 W CN 2006002702W WO 2007093097 A1 WO2007093097 A1 WO 2007093097A1
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WO
WIPO (PCT)
Prior art keywords
signal
electrical
illumination
communication terminal
optical
Prior art date
Application number
PCT/CN2006/002702
Other languages
English (en)
French (fr)
Inventor
Ruobin Zheng
Original Assignee
Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CNA2006800131779A priority Critical patent/CN101164259A/zh
Priority to EP06804926A priority patent/EP1990936A4/en
Publication of WO2007093097A1 publication Critical patent/WO2007093097A1/zh
Priority to US12/192,368 priority patent/US20080304833A1/en

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Classifications

    • 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
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/1143—Bidirectional transmission
    • 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
    • H04B10/1149—Arrangements for indoor wireless networking of information
    • 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]
    • H05B45/10—Controlling the intensity of the light
    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/175—Controlling the light source by remote control
    • H05B47/19—Controlling the light source by remote control via wireless transmission
    • H05B47/195—Controlling the light source by remote control via wireless transmission the transmission using visible or infrared light
    • 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]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/12—Controlling the intensity of the light using optical feedback

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to an illuminating optical wireless communication system.
  • radio wave communication which has been used as a signal carrier for wireless communication, has been widely used until now. weakness is:
  • Radio wave communication has strong electromagnetic interference, so the spectrum is regulated by the government;
  • the wireless bandwidth is low, and the available frequency resources are small;
  • radio waves are open to the space, and usually can pass through the wall, poor security and confidentiality;
  • Wireless electromagnetic waves have a biological electromagnetic effect, which has a certain degree of influence on human health.
  • the other is that laser wireless communication has the following disadvantages:
  • Table 1 is a point laser safety standard based on total transmit power. It is difficult to have a good power budget for indoor use lasers. Value
  • LED infrared light emitting diode
  • infrared wireless communication Infrared light is in the invisible band and cannot be used as an illumination source.
  • LEDs The light produced by LEDs is usually monochromatic or colored.
  • lamps made of LEDs have many advantages such as small size, reliability, long life, low voltage, energy saving, and no pollution, they are usually only used for instrument indications, etc.
  • LED lamps can be used for wireless transmission, but they are hardly used in actual production and life because they are colored light and cause visual pollution.
  • an object of the present invention to provide an illumination light wireless communication system that enables illumination light to function as both a light wireless communication source and a source of illumination.
  • An illumination light wireless communication system for illuminating and communicating with a remote communication device, the system comprising an illumination communication device, a lighting communication terminal and a communication terminal, wherein
  • the illumination communication device is configured to receive a source signal from the remote communication device; convert the received source signal into an optical signal, and perform wireless transmission as an optical signal; receive the optical signal, and receive the received light Converting the signal into an electrical signal for transmission to the remote communication device; wherein one or both of the optical signals received or transmitted by the illumination communication device are illumination light;
  • the illumination communication terminal is configured to convert the received optical signal into an electrical signal and transmit the communication to the communication a communication terminal; converting an electrical signal to be transmitted from the communication terminal into an optical signal and transmitting the wireless signal to the illumination communication device;
  • the communication terminal is configured to receive an electrical signal from the illumination communication terminal, perform corresponding processing, or transmit the processed electrical signal to the illumination communication terminal.
  • the illuminating communication device includes an optical transmitter, an optical receiver, an interface receiving unit, and an interface sending unit, where
  • the interface receiving unit is configured to receive a source signal from the remote communication device, and convert the signal into a signal recognizable by the optical transmitter, and then transmit the signal to the optical transmitter;
  • the light emitter is configured to convert the received signal into an optical signal and perform wireless transmission in the manner of an optical signal
  • the optical receiver is configured to receive an optical signal from the illumination communication terminal, convert the received optical signal into an electrical signal, and transmit the signal to the interface sending unit;
  • the interface sending unit transmits the received signal to the remote communication device.
  • the illumination communication terminal includes an optical transmitter, an electrical demodulator, an electrical modulator, and an optical receiver.
  • the optical receiver is configured to convert the received optical signal into an electrical signal and transmit the signal to the electrical demodulator;
  • the electrical demodulator is configured to perform demodulation processing on the received signal and then transmit the signal to the communication terminal;
  • the electrical modulator is configured to perform modulation processing on the signal from the communication terminal, and then send the signal to the optical transmitter;
  • the optical transmitter is configured to convert the received signal from the electrical modulator into an optical signal and perform wireless transmission in the manner of an optical signal.
  • the illuminating communication device includes an optical transmitter, an optical receiver, an interface receiving unit, an interface transmitting unit, an electrical modulator, and an electrical demodulator, where
  • the interface receiving unit is configured to receive a source signal from the remote communication device, and convert the signal into a signal that can be recognized by the electrical demodulator, and then transmit the signal to the electrical demodulator;
  • the electrical demodulator is configured to perform demodulation processing on the received signal and transmit the signal to the optical transmitter;
  • the optical transmitter is configured to convert the received signal into an optical signal, and the optical signal is Wireless transmission;
  • the optical receiver is configured to receive an optical signal from the illumination communication terminal, convert the received optical signal into an electrical signal, and transmit the signal to the electrical modulator;
  • the electrical modulator is configured to perform modulation processing on the received signal and send the signal to the interface to send a single G;
  • the interface sending unit transmits the received signal to the remote communication device.
  • the illumination communication terminal includes a light emitter and a light receiver
  • the optical receiver is configured to convert the received optical signal into an electrical signal and transmit the signal to the communication terminal;
  • the optical transmitter is configured to convert the received signal from the communication terminal into an optical signal, and perform wireless transmission in the manner of an optical signal.
  • the light emitter is a light emitter based on a light emitting diode LED or an array of LEDs.
  • the LED or LED array-based light emitter comprises at least a driving circuit and an LED or LED array;
  • the driving circuit is configured to drive a signal to provide a DC bias to the LED or the LED array;
  • the LED or LED array is configured to perform light intensity modulation according to an input signal and wirelessly transmit through the optical signal.
  • the LED or LED array-based optical transmitter further includes a filter, wherein the filter is configured to filter out-of-signal noise and transmit the filtered signal to the driving circuit.
  • the LED or LED array is an infrared LED or an LED array, or an illumination LED or an LED array;
  • the LED or LED array is further used for illumination when the LED or LED array is an illumination light LED or LED array.
  • the optical receiver comprises a driving circuit, a photodetector, a filter,
  • the driving circuit is configured to drive a photodetector to provide a DC bias to the photodetector;
  • the optical detector receives the optical signal under the driving of the driving circuit, and converts the received optical signal into an electrical signal and transmits the signal to the filter; the filter is used to filter out the signal noise, and the filtered signal is Transmitted to an electrical demodulator;
  • the photodetector is an infrared photodetector or an illumination photodetector.
  • the illumination photodetector is a photodiode or a solar panel
  • the photodiode When the optical signal is illumination light, the photodiode is an illumination photodiode; when the optical signal is infrared light, the photodiode is an infrared photodiode.
  • the interface receiving unit is a wired interface receiving unit, and the interface sending unit is a wired interface sending unit; or the interface receiving unit is a wireless interface receiving unit, and the interface sending unit is a wireless interface sending unit.
  • the electrical modulator is an electrical modulator based on Orthogonal Frequency Division Multiplexing (OFDM), or an electrical modulator based on a spread spectrum technique, or an Ethernet physical layer electrical modulator;
  • OFDM Orthogonal Frequency Division Multiplexing
  • Ethernet Ethernet physical layer electrical modulator
  • the electrical demodulator is an OFDM-based electrical demodulator, or a spread spectrum based electrolyzer, or an Ethernet physical layer electrical demodulator.
  • the OFDM-based electrical modulator includes a channel coding unit, a symbol mapping unit, and an OFDM modulator; wherein the channel coding unit is configured to receive a signal to be transmitted and perform channel coding processing on the signal, and the symbol mapping unit uses For performing constellation symbol mapping processing on the channel-coded signal, the OFDM modulator is configured to perform OFDM modulation processing on the symbol-mapped symbols;
  • the OFDM-based electrical demodulator includes: a channel decoding unit, a symbol demapping unit, and an OFDM demodulator, wherein an OFDM demodulator is configured to perform OFDM demodulation processing on the received signal, and a symbol demapping unit is used.
  • a constellation symbol de-mapping process for digitally modulating the OFDM-demodulated signal, the channel decoding unit is configured to perform channel decoding processing on the received signal.
  • the OFDM-based electrical modulator is a digital subscriber line xDSL electrical modulator, or a cable cable electrical modulator, or a power line communication PLC electrical modulator;
  • the OFDM-based electrical demodulator is an xDSL electrical demodulator, or a cable electrical demodulator, or a PLC electrical demodulator.
  • the electrical modulator and the electrical demodulator based on the spread spectrum technique are: based on direct sequence Spread spectrum DS technology, or based on FM FH technology, or based on time-hopping TH technology, or an electrical modulator and an electrical demodulator based on chirp Chirp technology.
  • the interface receiving unit is a wired interface receiving unit
  • the interface sending unit is a wired interface sending unit
  • the lighting communication device and the remote communication device directly connect by using a wired cable, and the wired
  • the cable is a telephone line, or a CATV cable, or an Ethernet cable, or a power cord.
  • the illuminating communication terminal is located inside the communication terminal or outside the communication terminal; when the illuminating communication terminal is located outside the communication terminal, a illuminating communication terminal and one or more communication terminals perform wired or wireless transmission.
  • the communication terminal is a computer, or a mobile phone, or a fax machine, or a fixed telephone, or a PDA, or a network television.
  • the light emitted by the illumination communication device and/or the illumination communication terminal can be used as both a light wireless communication light source and a light source for illumination, and the illumination light is used as both optical communication.
  • the purpose of the light source as a light source for illumination overcomes the prejudice that the conventional illumination light cannot be used as a wireless communication carrier.
  • it has the following advantages:
  • the available spectrum is wide and the bandwidth is high;
  • the light of the illumination usually cannot pass through the wall, and the security and confidentiality are strong;
  • Illumination light LED for generating illumination light belongs to a large-angle emitter. Since it is not a point source, the image area on the retina is large, the energy is dispersed, and it is safer to use, even if it is high power output. ;
  • the output energy can be simply increased to the level of indoor lighting
  • illuminating LED technology Using illuminating LED technology, visible light, or illuminating light, is transmitted at a speed that is undetectable by the human eye, allowing the use of existing lighting infrastructure with minimal modifications, such as replacing the incandescent with illuminating LEDs.
  • the light source can ensure both wireless communication and illumination. There is no problem with light pollution.
  • the electrical modem adopts Orthogonal Frequency Division Multiplexing (OFDM) technology
  • OFDM Orthogonal Frequency Division Multiplexing
  • the photodetector of the present invention can also be realized by using a solar panel, so that in addition to converting the visible light signal which has been modulated by the information, that is, the illumination light signal into an electrical signal, the illumination light can be used to supply power to the device.
  • the present invention is applicable not only to indoors but also to outdoor use.
  • FIG. 1 is a schematic structural diagram of an illumination optical communication system according to an embodiment of the present invention.
  • Figure 2a is a structural block diagram of the structure of the illuminating light wireless communication system according to the first embodiment of the present invention
  • Figure 2b is a structural block diagram of the illuminating light wireless communication system according to the second embodiment of the present invention
  • Figure 2d is a structural block diagram of the structure of the illumination optical communication system of the fourth embodiment of the present invention
  • Figure 3 is a schematic functional block diagram of the optical transmitter
  • Figure 4 is an example of an illumination light LED driving circuit
  • Figure 5 is a functional block diagram of the optical receiver
  • FIG. 6 is a functional block diagram of an electrical modulator based on OFDM technology
  • FIG. 7 is a functional block diagram of an electrical demodulator based on OFDM technology
  • Figure 8 is a functional block diagram of the OFDM modulator of Figure 6;
  • FIG. 9 is a functional block diagram of the OFDM demodulator of FIG. 7;
  • FIG. 10 is a schematic functional block diagram of an electrical modulator based on direct sequence spread spectrum (DS) technology
  • FIG. 11 is a functional block diagram of an electrical demodulator based on DS technology
  • 12 is a schematic functional block diagram of an electrical modulator based on frequency modulation spread spectrum (FH) technology
  • FIG. 13 is a functional block diagram of an electrical demodulator based on FH technology.
  • DS direct sequence spread spectrum
  • FH frequency modulation spread spectrum
  • the illumination communication device receives the source signal of the remote communication device, performs wireless communication with the communication terminal by means of light, and at the same time, since the light emitted or received by the illumination communication device is illumination light, it can serve as a light source for wireless communication. , can also be used for lighting.
  • the illuminating light wireless communication system is used for illumination and communication with the remote communication device 110.
  • the system includes an illumination communication device 120, an illumination communication terminal 130, and a communication terminal 140, wherein the illumination communication device 120 is configured to receive a source signal from the remote communication device 110 through a wired cable; convert the received source signal into The optical signal is wirelessly transmitted in the manner of an optical signal; the optical signal is received, the received optical signal is converted into an electrical signal, and transmitted to the remote communication device 11Q through a wired cable; and the illumination communication device 120 receives or transmits One or both of the optical signals are illumination light, and the blinking speed of the illumination light is not perceptible by the human eye; the illumination communication terminal 130 is configured to convert the received optical signal into an electrical signal and transmit it to the communication terminal 140, The electrical signal to be transmitted from the communication terminal 140 is converted into an optical signal and then wirelessly transmitted to
  • the illumination communication device 120 can be used both as a light wireless communication source and as a source of illumination.
  • the illuminating communication device 120 can modulate and optically transmit the source signal by using a large outdoor display screen equipped with the illuminating light LED, a lighting device, a signal light, and a car headlight, and the illuminating communication terminal 130 receives the light sensor using a photodiode or the like.
  • White light that is, illumination light can be flashed at a speed that the human eye cannot sense.
  • the sleek method of transmitting data allows the use of existing lighting infrastructure with minimal modifications, such as replacing the incandescent light source with illuminated LEDs to ensure both optical and wireless communication.
  • the illumination light can also transmit data in a light-shadow manner.
  • the illumination light LED referred to herein may also be referred to as a white LED or a white LED.
  • the illuminating communication terminal 130 is located inside the communication terminal 140.
  • the illuminating communication terminal 130 may also be located outside the communication terminal 140.
  • the two are respectively independent.
  • one illuminating communication terminal 130 may be one or A plurality of communication terminals 140 provide services, i.e., one illumination communication terminal 130 can be wired or wirelessly transmitted with one or more communication terminals 140 at this time.
  • the illumination communication device 120 includes an optical transmitter 121, a light receiver 122, a wired interface receiving unit 123, and a wired interface sending unit 124.
  • the wired interface receiving unit 123 transmits the remote communication device through a wired cable.
  • the source signal of 110 is converted into a signal recognizable by the optical transmitter 121 and then transmitted to the optical transmitter 121.
  • the optical transmitter 121 is configured to convert the received source signal into an optical signal and perform wireless transmission in the manner of an optical signal.
  • the optical receiver 122 is configured to receive the optical signal from the illumination communication terminal 130, convert the received optical signal into an electrical signal, and transmit the signal to the wired interface transmitting unit 124, and the wired interface transmitting unit 124 passes the received signal through the wired line.
  • the cable is transmitted to the remote communication device 110.
  • the above illumination communication terminal 130 includes an optical receiver 131, an optical transmitter 132, an electrical demodulator 133 and an electrical modulator 134, wherein the optical receiver 131 is configured to convert the received optical signal into an electrical signal. Thereafter, it is transmitted to the electrical demodulator 133; the electrical demodulator 133 is configured to transmit the received signal to the communication terminal 140; and the electrical modulator 134 is configured to modulate the signal from the communication terminal 140. Thereafter, it is sent to the optical transmitter 132; the optical transmitter 132 is configured to convert the received signal from the electrical modulator 134 into an optical signal for wireless transmission.
  • the remote communication device 110 includes a core processing unit 111, an electrical modulator 112, an electrical demodulator 113, a wired interface sending unit 114, and a wired interface receiving unit 115.
  • the core processing unit 111 is configured to receive or The source signal is generated, the source signal is sent to the electrical modulator 112, or is used to process the signal from the electrical demodulator 113, and the electrical modulator 112 is used to modulate the signal from the core processing unit 111. After that, it is sent to the wired interface sending unit 114, and the wired interface sending unit 114 transmits the received signal through the wired cable.
  • the wired interface receiving unit 1 15 receives the signal from the illumination communication device 120 through the wired cable, and transmits the signal to the electrical demodulator 1 13 , and the electrical demodulator 1 13 pairs the received signal After demodulation processing, it is transmitted to the core processing unit 1 1 1 .
  • FIG. 2b it is a functional block diagram of the illuminating light wireless communication system according to the second embodiment of the present invention.
  • the difference from the embodiment shown in FIG. 2a is: In FIG. 2a, between the remote communication device 110 and the illuminating communication device 120.
  • the transmission is effected by means of a wired cable.
  • the remote communication device 110 and the illumination communication device 120 are wirelessly transmitted, the rest being identical to the embodiment shown in Figure 2a. That is, if all the interface units are divided into two categories: an interface sending unit and an interface receiving unit, in FIG. 2a, the interface sending unit and the interface receiving unit are respectively a wired interface sending unit and a wired interface receiving unit, In FIG. 2b, the interface sending unit and the interface receiving unit are respectively a wireless interface sending unit and a wireless interface receiving unit, and the rest are not repeated herein.
  • FIG. 2c it is a functional block diagram of the illuminating optical wireless communication system according to Embodiment 3 of the present invention, which is different from the embodiment shown in FIG. 2a in that the electrical demodulator and the electrical modulator in the illuminating communication terminal 130 are moved to In the communication lighting device 120, at this time, the internal structure and completed operation of the communication lighting device 120 and the clear communication terminal 130 are as follows:
  • the illumination communication device 120 includes a light emitter 121, a light receiver 122, a wired interface receiving unit 123, a wired interface transmitting unit 124, an electrical modulator 128, and an electrical demodulator 127.
  • the wired interface receiving unit 123 is configured to receive the source signal from the remote communication device 110, convert the signal into a signal recognizable by the electrical demodulator 127, and transmit the signal to the electrical demodulator 127; the electrical demodulator 127 receives the signal The received signal is demodulated and transmitted to the optical transmitter 121.
  • the optical transmitter 121 converts the received signal into an optical signal and wirelessly transmits the optical signal.
  • the optical receiver 122 receives the optical signal from the illumination communication terminal 130, converts the received optical signal into an electrical signal, and transmits it to the electrical modulator 128.
  • the electrical modulator 128 modulates the received signal and sends it to the wired interface.
  • the transmitting unit 124 transmits the received signal to the remote communication device 110 by the wired interface transmitting unit 124.
  • the light communication device 130 and the light receiver 131 are included in the illumination communication terminal 130.
  • the optical receiver 13 1 converts the received optical signal into an electrical signal and transmits it to the communication terminal 140.
  • the optical transmitter 132 converts the received signal from the communication terminal 140 into an optical signal, and performs the optical signal as Line transmission.
  • FIG. 2d it is a functional block diagram of the illuminating light wireless communication system according to Embodiment 4 of the present invention.
  • the difference from the embodiment shown in FIG. 2c is: In FIG. 2c, between the remote communication device 110 and the illuminating communication device 120. Transmission is achieved by means of a wired cable.
  • the remote communication device 110 and the illuminating communication device 120 are wirelessly transmitted, the remainder being identical to the embodiment shown in Figure 2c. That is, in FIG. 2c, the interface sending unit and the interface receiving unit are respectively a wired interface sending unit and a wired interface receiving unit, and in FIG. 2d, the interface sending unit and the interface receiving unit are respectively sent by the wireless interface. Unit and wireless interface receiving unit.
  • All the wired interface receiving units described above are mainly composed of an impedance matching circuit and a preamplifier, the impedance matching circuit is used for impedance conversion and adaptation between the internal communication unit and the wired cable, and the preamplifier is used for preamplifying the signal. deal with.
  • All of the wireless interface receiving units described above are mainly composed of a receiving antenna and a wireless receiver, and are used for receiving and processing wireless signals, such as low-frequency amplification and down-conversion processing.
  • all the wired interface sending units described above are mainly composed of an impedance matching circuit and a power amplifier.
  • the impedance matching circuit is used for impedance conversion and adaptation between the internal communication unit and the wired cable, and the power amplifier is used for power amplification of the signal. deal with.
  • All of the above-mentioned wireless interface transmitting units are mainly composed of a transmitting antenna and a wireless transmitter, and are used for transmitting up-conversion processing and power amplification processing on the wireless signal.
  • the light emitter includes a filter 310, a driving circuit 320, and white. LED or LED array 330.
  • Filter 310 is used to filter out-of-signal noise; drive circuit 320 is used to receive the output signal of the filter, to generate a forward current through the component, to provide a DC bias to the white LED or LED array 330; a white LED or LED array 330 is used Light intensity modulation is performed according to the input signal, and wireless transmission is performed by the optical signal.
  • the filter 310 is not included in the optical transmitter, it is only effective, and the interference is not good.
  • the optical wireless communication system adopts a frequency division mode (FDD) mode, for the light communication terminal of the present invention and the light emitter in the illumination communication device, one of the two is an illumination light emitter, and the other An infrared light emitter; if the optical wireless communication system adopts a time division duplex mode (TDD) mode, for the illumination communication terminal and the illumination communication device of the present invention
  • FDD frequency division mode
  • TDD time division duplex mode
  • the difference between the infrared light emitter and the illumination light emitter is mainly that the LED used is different, the infrared light emitter uses an infrared LED, and the illumination light emitter uses an illumination light LED or an illumination light LED array, that is, for the illumination light LED Or an array of illumination light LEDs that are used not only to transmit data in the form of light, but also to illuminate.
  • Illumination LED or illumination The LED array emits visible light in the wavelength range of 380 nm to 780 nm.
  • the input modulation signal is subjected to direct intensity modulation by causing a change in the conduction current of the illumination LED.
  • Illumination Light LED or Illumination The main goal of the LED array driver circuit is to generate a forward current through the component, which can be achieved with a constant voltage source or a constant current source.
  • Figure 4(a) is the lowest cost solution that combines the illumination light LEDs in series with a ballast resistor (RB) and a constant voltage source across the circuit. Since the ballast resistance limits the current through, the nonlinear VI curve of the illumination LED also makes the current flow stability of this method very poor; in addition, as long as the applied voltage or the forward voltage (VF) of the illumination LED has any Variations, the current of the illumination LED will change, so extreme changes in the LED current of this illumination will affect the brightness of the display, which is unacceptable for many applications.
  • RB ballast resistor
  • VF forward voltage
  • Figure 4 (b) is an ideal solution, which is implemented by means of a constant current source.
  • the voltage across the current sensing resistor is directly regulated.
  • the current through the illumination LED is determined by the reference voltage value and the current sensing resistance value of the power supply.
  • Most monitors require multiple illumination LEDs.
  • all illumination LEDs should be connected in series to ensure that the current is the same for each illumination LED.
  • each illumination LED must be connected in series with a ballast resistor to avoid differences in their currents, but these resistors also waste power and reduce circuit efficiency.
  • This method avoids current fluctuations caused by changes in the forward voltage of the illumination light LED, and provides a controllable constant display brightness by using a controllable constant forward current.
  • the constant current source is very simple to generate, and the controller does not need to regulate the power supply output.
  • the optical receiver includes a drive circuit 510, a photodetector 520 and a filter 530.
  • the light detector 520 receives the optical signal under the driving of the driving circuit 510, and converts the received optical signal into an electrical signal and transmits it to the filter 530.
  • the filter 530 filters the out-of-signal noise, and filters the filtered signal. The signal is sent to the electrical demodulator.
  • the filter 530 is not included in the optical receiver, it is only true that there is interference and the effect is not good.
  • one of the illumination communication terminal and the illumination receiver in the illumination communication device of the present invention is an illumination light receiver, and the other is an infrared light receiver;
  • both the illumination communication terminal of the present invention and the intermediate light receiver of the illumination communication device may be illumination light receivers, or one of them may be an illumination light receiver, and the other It is an infrared light receiver.
  • the difference between the infrared light receiver and the illumination light receiver is mainly the difference between the photodiode used.
  • the infrared light receiver uses an infrared photodiode
  • the illumination light receiver uses an illumination photodiode, which is also called a white photodiode.
  • White light-sensitive diodes use Direct Detection technology to convert information-modulated visible light signals, ie, illumination light signals, with wavelengths ranging from 380 nm to 780 nm into electrical signals, which are equivalent to detectors in electrical communication systems.
  • the photodetector can also be realized by a solar panel, which can convert visible light signals modulated by the skin information, that is, signals having a wavelength range of 380 nm to 780 nm in the present invention into electric signals, and can also utilize visible light.
  • Light energy, or illumination can supply power to the device in which it is located.
  • At least one line must use an illumination light emitter to implement illumination function while transmitting data, that is, at least one of the light emitter 121 and the light emitter 132 uses an illumination light emitter. Accordingly, the optical receiver 122 and the optical receiver 131 are to be matched thereto.
  • all the electrical modulators and the electrical demodulator are actually the same, and may be an electrical modulator and an electrical demodulator based on Orthogonal Frequency Division Multiplexing (OFDM) technology. It is an electrical modulator and an electrical demodulator based on spread spectrum technology, and can also be an electrical modulator and an electrical demodulator based on an Ethernet physical layer. Of course, the actual application is not limited to this, and this is only a few embodiments. 6 and 7, which are schematic functional block diagrams of an OFDM-based electrical modulator and an electrical demodulator, respectively.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the OFDM-based electrical modulator includes a channel coding unit 610, a symbol mapping unit 620, and an OFDM modulator 630.
  • the channel coding unit 610 is configured to receive a signal to be transmitted and perform channel coding processing on the signal.
  • the symbol-mapped symbol processing unit 620 performs digitally modulated constellation symbol mapping processing on the channel-encoded signal, and the OFDM modulator 630 is configured to perform OFDM modulation processing on the symbol-mapped symbols.
  • an OFDM-based electrical demodulator includes a channel decoding unit 730, a symbol demapping unit 720, and an OFDM demodulator 710, where the OFDM demodulator 710 is configured to perform OFDM demodulation processing on the received signal.
  • the symbol demapping unit 720 is configured to perform digitally modulated constellation symbol de-mapping processing on the OFDM-demodulated signal
  • the channel decoding unit 730 is configured to perform channel decoding processing on the received signal.
  • the connection between the illuminating communication device 120 and the remote communication device 110 is implemented by using a wired cable, and an OFDM-based electric modulator and an electric demodulator are used
  • the wired cable is a telephone line
  • the digital subscriber line is used.
  • the cable is a cable television (CATV) cable
  • cable (Cable) electrical modulator and electrical demodulator if the wired cable is a power cable, the power cable is used
  • Communication PLC Electrical modulator and electrical demodulator.
  • the advantages are: (1) high spectral utilization, theoretically reaching the limits of Shannon's information theory; (2) effectively overcoming inter-symbol interference (ISI); 3) It can effectively resist channel fading.
  • OFDM technology classifies the frequency selective fading channel into multiple parallel related flat fading channels. Therefore, the channel equalization technology can meet the system performance requirements without complex adaptation.
  • Equalization technology (4) Anti-noise interference, OFDM overcomes the noise of the channel noise by subchannel allocation to sell; (5) Suitable for high-speed data transmission. Therefore, it is possible to resist multipath interference, avoid delay spread of the optical wireless channel and the cable channel, and improve the modulation rate of the illumination light LED.
  • the electrical modulator and the electrical demodulation of the remote communication device may be an electric modulator and an electric demodulator based on direct sequence spread spectrum (DS) technology, or may be based on frequency modulation (FH, Frequency Hopping technology is an electrical modulator and an electrical demodulator. It can also be an electrical modulator and an electrical demodulator based on techniques such as TH: Time Hopping and Chirp.
  • DS direct sequence spread spectrum
  • FH Frequency Hopping technology is an electrical modulator and an electrical demodulator. It can also be an electrical modulator and an electrical demodulator based on techniques such as TH: Time Hopping and Chirp.
  • FIG. 8 is a schematic functional block diagram of the OFDM modulator of FIG. 6.
  • digital modulation serial-to-parallel conversion (or serial-to-parallel conversion, and then digital modulation) is first performed, and M-channel parallelism is performed.
  • IFFT Inverse Fast Fourier Transform
  • the preamplifier After receiving the signal, the preamplifier amplifies the received signal, and after deleting the cyclic prefix and the serial-to-parallel conversion process, the signal is represented as
  • N is the number of subcarriers.
  • FFT fast Fourier transform
  • a DS-based modulator (the spectrum is extended directly by a high-rate spreading code sequence): binary information carrying coexistence negotiation signaling input at the transmitting end, channel-encoded Thereafter, the spreading code sequence generated by the spreading code generator is demodulated to broaden the spectrum of the signal, and then modulated by the digital modulator, and then transmitted.
  • the spreading code sequence can adopt a pseudo random code (PN code) sequence, which has better autocorrelation and cross-correlation properties.
  • PN code pseudo random code
  • a demodulator based on DS technology a broadband information signal received at the receiving end, which is digitally demodulated, and then locally generated by the same spreading code sequence as the transmitting end.
  • the column performs spread spectrum demodulation, and then passes through a narrowband filter and channel decoding to recover binary information carrying coexistence negotiation signaling.
  • the modulator based on the FH technology the binary information carrying the coexistence negotiation signaling input by the transmitting end is subjected to channel coding, and then subjected to modulation processing by a digital modulator, and then the digital modulator is generated by the spreading code generator.
  • the output frequency of the frequency synthesizer controlled by the spreading code sequence is mixed to broaden the spectrum of the signal and then transmit it out.
  • the spreading code sequence can adopt a pseudo random code (PN code) sequence, which has better autocorrelation and cross-correlation properties.
  • the FH-based electrical demodulator the broadband information signal received at the receiving end, first digitally demodulated, and the frequency generated by the locally generated spreading code sequence identical to the transmitting end.
  • the output frequency of the synthesizer is mixed, and then digital demodulation and channel decoding are performed to recover the binary information carrying the coexistence negotiation signaling.
  • the communication terminal mentioned above includes, but is not limited to, a computer, a mobile phone, a fax machine, a telephone, a PDA, a network television, etc.
  • the remote communication device includes, but is not limited to, a computer, a mobile phone, a fax machine, a telephone, a PDA, a network television, etc., wherein The remote communication device and the communication terminal may be the same device or different devices.
  • the present invention is particularly suitable for the following application scenarios in addition to the home application: in a place with strong electromagnetic dryness; some places that are not suitable for wiring, such as in a mundane ancient building, which is dangerous. Factory, workshop; in the case of high cost, difficult construction or difficult approval by the municipal department, such as between the buildings on both sides of the road; some temporary places, such as exhibition halls, short-term rental business offices; In the case of mobility, such as a trading floor using a portable computer. It can be seen that it is suitable both indoors and outdoors.

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Description

照明光无线通信系统 本申请要求于 2006 年 2 月 17 日提交中国专利局、 申请号为 200610008311.8, 发明名称为 "照明光无线通信系统，，的中国专利申请的优 先权， 其全部内容通过引用结合在本申请中。
技术领域 本发明涉及通信技术领域， 尤其涉及一种照明光无线通信系统。
背景技术 现有无线通信的主要有三种：
一种是， 无线电波通信， 其作为无线通信的信号载体由来已久， 至今 仍广泛应用。 缺点是：
1、 无线电波通信有较强的电磁干扰， 因此频谱受政府管制；
2、 无线带宽较低， 可用频率资源少；
3、 无线电波为空间开放的， 且通常可以穿墙， 安全保密性差；
4、 无线电磁波有生物电磁效应， 对人体健康有一定程度的影响。 另一种是， 激光无线通信， 缺点是：
1、 由于大气的传输特性（大气引起的吸收、 反射、 散射、 闪烁）， 特 别是背景辐射的影响， 通常不宜采用可见波段的激光；
2、 在室内应用， 激光器的使用需考虑对人身的安全问题， 主要是对人 眼的伤害， 表 1 是根据总发射功率制定的点激光安全标准， 室内使用激光 器很难有一个好的功率预算值；
3、 技术复杂、 成本高。 m 650nm SSOmii iOnm 1550ηαι
(可见光） (红外） (红外） (：红外〕
类别 1 ~0.2mW 5mW 〜10mW 类别 2 0.2~lmW - - - 3A 1〜5mW 3.5〜2. 5i 8- 8〜45禮 10~S0mW
鋼 3B 5~"50-0mW 2. 5〜500miW
Figure imgf000004_0001
再一种是， 红外光无线通信， 主要由红外光发光二极管 （LED )发射 机和红外光接收机组成。
红外光无线通信的缺点是： 红外光处于不可见波段， 无法作为照明光 源应用。
LED产生的光通常是单色或有色光， 虽然由 LED制成的灯具有小巧、 可靠、 寿命长、 低压、 节能、 无污染等诸多优势， 但其通常仅用于仪表指 示等， 很少用于日常生活照明， 对于一般照明而言， 人们需要白色的光源。 再有 LED灯虽然可以用于无线传输，但在实际的生产生活中几乎不会这样 使用， 这是因为其是有色光， 会产生视觉污染。
可见， 如何使照明光成为无线通信的载体目前还是空白。
发明内容
有鉴于此， 本发明的目的在于提供一种照明光无线通信系统， 使照明 光既能作为光无线通信光源， 同时又可以作为照明的光源。
为此， 本发明的技术方案是这样实现的：
一种照明光无线通信系统， 用于照明以及与远端通信设备进行通信， 该系统包含照明通信装置， 照明通信终端和通信终端， 其中，
所述照明通信装置， 用于接收来自远端通信设备的信源信号； 将接收 到的信源信号转换为光信号， 并以光信号的方式进行无线传输； 接收光信 号， 将接收到的光信号转换为电信号， 传送给远端通信设备； 其中， 所述 照明通信装置接收或发送的光信号之一或两者均为照明光；
所述照明通信终端， 用于将接收到的光信号转换为电信号后传送给通 信终端； 将来自通信终端的待发送电信号转换为光信号后无线传输给照明 通信装置；
所述通信终端， 用于接收来自照明通信终端的电信号， 进行相应处理， 或将处理后的电信号发送给照明通信终端。
较佳地， 所述照明通信装置中包括光发射器、 光接收器、 接口接收单 元和接口发送单元， 其中，
所述接口接收单元， 用于接收来自远端通信设备的信源信号， 并将该 信号转换为光发射器能够识別的信号后传送给光发射器；
所述光发射器， 用于将接收到的信号转换为光信号， 并以光信号的方 式进行无线传输；
所述光接收器， 用于接收来自照明通信终端的光信号， 将接收到的光 信号转换为电信号， 传送给接口发送单元；
所述接口发送单元， 将接收到的信号传送给远端通信设备。
较佳地， 所述照明通信终端中包括光发射器、 电解调器、 电调制器和 光接收器，
所述光接收器， 用于将接收到的光信号转换为电信号后传送给电解调 器；
所述电解调器， 用于对接收到的信号做解调处理后传送给通信终端； 所述电调制器， 用于对来自通信终端的信号 4故调制处理后发送给光发 射器；
所述光发射器， 用于将接收到的来自电调制器的信号转换为光信号， 以光信号的方式进行无线传输。
较佳地， 所述照明通信装置中包括光发射器、 光接收器、 接口接收单 元、 接口发送单元， 电调制器和电解调器， 其中，
所述接口接收单元， 用于接收来自远端通信设备的信源信号， 并将该 信号转换为电解调器能够识别的信号后传送给电解调器；
所述电解调器， 用于对接收到的信号做解调处理后传送给光发射器； 所述光发射器， 用于将接收到的信号转换为光信号， 并以光信号的方 式进行无线传输；
所述光接收器， 用于接收来自照明通信终端的光信号， 将接收到的光 信号转换为电信号， 传送给电调制器；
所述电调制器， 用于对接收到的信号做调制处理后发送给接口发送单 G ;
所述接口发送单元， 将接收到的信号传送给远端通信设备。
较佳地， 所述照明通信终端中包括光发射器和光接收器，
所述光接收器， 用于将接收到的光信号转换为电信号后传送给通信终 端；
所述光发射器， 用于将接收到的来自通信终端的信号转换为光信号， 以光信号的方式进行无线传输。
较佳地， 所述光发射器为基于发光二极管 LED或 LED阵列的光发射 器。
较佳地， 所述基于 LED或 LED阵列的光发射器至少包括驱动电路和 LED或 LED阵列； 其中，
所述驱动电路， 用于对信号进行驱动， 对 LED或 LED阵列提供直流 偏置；
所述 LED或 LED阵列， 用于根据输入信号进行光强度调制， 通过光 信号进行无线传输。
较佳地， 所述基于 LED或 LED阵列的光发射器进一步包括滤波器， 其中， 所述滤波器， 用于滤除信号外噪声， 并将滤波后的信号传送给驱动 电路。
较佳地， 所述 LED或 LED阵列为红外 LED或 LED阵列， 或者为照 明光 LED或 LED阵列；
当所述 LED或 LED阵列为照明光 LED或 LED阵列时 ,该 LED或 LED 阵列进一步用于照明。
较佳地， 所述光接收器包括驱动电路， 光检测器， 滤波器，
所述驱动电路， 用于驱动光检测器， 对光检测器提供直流偏置； 所述 光检测器在驱动电路的驱动下， 接收光信号， 并将接收到的光信号转换为 电信号后传送给滤波器； 所述滤波器， 用于滤除信号外噪声， 并将滤波后 的信号传送给电解调器；
所述光检测器为红外光检测器或照明光检测器。
较佳地， 所述照明光检测器为光敏二极管或太阳能电池板；
当所述光信号为照明光时， 所述光敏二极管为照明光光敏二极管； 当所述光信号为红外光时， 所述光敏二极管为红外光光敏二极管。 较佳地， 所述接口接收单元为有线接口接收单元， 所述接口发送单元 为有线接口发送单元； 或者， 所述接口接收单元为无线接口接收单元， 所 述接口发送单元为无线接口发送单元。
较佳地， 所述电调制器为基于正交频分复用 OFDM技术的电调制器， 或基于扩频技术的电调制器， 或以太网物理层电调制器；
所述电解调器为基于 OFDM技术的电解调器， 或基于扩频技术的电解 调器， 或以太网物理层电解调器。
较佳地， 所述基于 OFDM技术的电调制器包括信道编码单元， 符号映 射单元， OFDM调制器； 其中， 信道编码单元用于接收待发送信号并对该 信号进行信道编码处理， 符号映射单元用于对经信道编码后的信号作数字 调制的星座图符号映射处理， OFDM调制器用于对经符号映射后的符号作 OFDM调制处理；
所述基于 OFDM技术的电解调器包括， 信道解码单元， 符号解映射单 元， OFDM解调器， 其中， OFDM解调器用于对接收到的信号作 OFDM解 调处理，符号解映射单元用于对经 OFDM解调后的信号作数字调制的星座 图符号解映射处理，信道解码单元用于对接收到的信号进行信道解码处理。
较佳地， 所述基于 OFDM技术的电调制器为数字用户线 xDSL电调制 器， 或电缆 Cable电调制器， 或电力线通信 PLC电调制器；
所述基于 OFDM技术的电解调器为 xDSL电解调器， 或 Cable电解调 器， 或 PLC电解调器。
较佳地， 所基于述扩频技术的电调制器和电解调器为： 基于直接序列 扩频 DS技术， 或基于调频 FH技术， 或基于跳时 TH技术、 或基于线性调 频 Chirp技术的电调制器和电解调器。
较佳地， 当所述接口接收单元为有线接口接收单元， 接口发送单元为 有线接口发送单元时 , 所述照明通信装置与远端通信设备直接通过有线线 缆的方式实现连接， 且所述有线线缆为电话线， 或 CATV电缆， 或以太网 线， 或电源线。
较佳地， 所述照明通信终端位于通信终端内部， 或通信终端外部； 当照明通信终端位于通信终端外部时， 一个照明通信终端与一个或一 个以上通信终端之间进行有线或无线传输。
. 较佳地， 所述通信终端为电脑， 或手机， 或传真机， 或固定电话， 或 PDA, 或网络电视。
应用本发明的照明光无线通信系统， 使得由照明通信装置和 /或照明通 信终端发出的光既能够作为光无线通信光源， 同时又可以作为照明的光源， 实现了由照明光既作为光无线通信光源又作为照明的光源这一目的，同时， 克服了人们惯有的照明光不能作为无线通信载体的偏见。 而且， 和现有的 无线通信方式相比， 具有如下优点：
对比现有无线电波通信有如下优点：
1、没有无线电磁干扰，频谱不受政府管制，对电子仪器没有电磁影响；
2、 可用的频谱宽、 带宽高；
3、 照明的光通常不能穿墙， 安全保密性较强；
4、 无生物电磁效应。
对比现有激光无线通信有如下优点：
1、用于产生照明光的照明光 LED属于大角度发射器， 由于它不是点光 源， 因而在视网膜上成象的面积大， 能量是分散的， 使用起来更为安全， 既使是高功率输出；
2、 使用多个照明光 LED组成的阵列， 便能简单地将输出能量提高到 室内照明的水平；
3、 由于照明光 LED对人眼安全， 可以用于室内光通信， 室内工作环 境比室外的稳定， 无需应付恶劣天气情况和背景辐射的装置，因此技术筒 单、 成本低。
对比现有红外光光无线通信有如下优点：
采用照明光 LED技术，可见光即照明光以人眼无法感测的速度进行闪 烁的方法来传送数据， 因而允许采用现有的照明基础设施， 只需稍作改动， 比如用照明光 LED来替换白炽灯光源， 即可既保证光无线通信， 又可满足 照明的需要。 不存在光污染的问题。
另外， 当电调制解调器采用正交频分复用 （OFDM )技术时， 能有效 地避免光无线信道和有线线缆信道的多径干扰和时延扩展， 提高了照明光 LED的调制速率。
再有， 本发明地光检测器还可以利用太阳能电池板来实现， 这样除了 能够将已被信息调制的可见光信号即照明光信号转换为电信号外， 还能利 用照明光能为其所在设备供电。
基于上述特点， 本发明不仅适用于室内， 还适用于室外。
附图说明
图 1是本发明一实施例的照明光无线通信系统结构示意图；
图 2a是本发明实施例一的照明光无线通信系统结构功能框图； 图 2b是本发明实施例二的照明光无线通信系统结构功能框图； 图 2c是本发明实施例三的照明光无线通信系统结构功能框图； 图 2d是本发明实施例四的照明光无线通信系统结构功能框图； 图 3是光发射器的原理功能框图；
图 4是照明光 LED驱动电路示例；
图 5是光接收器的原理功能框图；
图 6是基于 OFDM技术的电调制器的原理功能框图；
图 7是基于 OFDM技术的电解调器的原理功能框图；
图 8是图 6中 OFDM调制器的原理功能框图；
图 9是图 7中 OFDM解调器的原理功能框图；
图 10是基于直接序列扩频（DS )技术的电调制器的原理功能框图； 图 11是基于 DS技术的电解调器的原理功能框图； 图 12是基于调频扩频 （FH )技术的电调制器的原理功能框图； 图 13是基于 FH技术的电解调器的原理功能框图。
具体实施方式
下面结合附图和具体实施例对本发明做进一步地详细说明。
图 1是本发明一实施例的照明光无线通信系统结构示意图。照明通信装 置接收远端通信设备的信源信号，通过光的方式与通信终端进行无线通信， 同时， 由于照明通信装置所发出或接收的光是照明光， 因而， 其既可作为 无线通信的光源， 又可用于照明。
图 2a所示为本发明实施例一的照明光无线通信系统结构功能框图。 参 见图 1和图 2a, 该照明光无线通信系统用于照明以及与远端通信设备 110进 行通信。 该系统包含照明通信装置 120、 照明通信终端 130和通信终端 140, 其中， 照明通信装置 120用于通过有线线缆接收来自远端通信设备 110的信 源信号； 将接收到的信源信号转换为光信号， 并以光信号的方式进行无线 传输； 接收光信号， 将接收到的光信号转换为电信号， 通过有线线缆传送 给远端通信设备 11Q; 且所述照明通信装置 120接收或发送的光信号之一或 两者均为照明光， 且该照明光的闪烁速度是人眼无法感知的； 照明通信终 端 130用于将接收到的光信号转换为电信号后传送给通信终端 140, 将来自 通信终端 140的待发送电信号转换为光信号后无线传输给照明通信装置 120;通信终端 140用于接收来自照明通信终端 130的电信号，进行相应处理， 或将处理后的电信号发送给照明通信终端 130。 这样， 照明通信装置 120发 出的光既可以作为光无线通信光源 , 又可以作为照明的光源。
也就是说， 如果定义照明通信装置 120到通信终端 140的方向为下行； 通信终端 140到照明通信装置 120的方向为上行， 那么上下行中至少有一条 线路应用照明光进行无线传输， 当然， 上下行均用照明光进行传输也是可 以的。 这样， 照明通信装置 120发出或接收到的光既可以用作为光无线通信 光源， 又可以作为照明的光源。 照明通信装置 120可以利用配备照明光 LED 的室外大型显示屏、 照明设备、 信号灯和汽车前灯等闪光的方法对信源信 号进行调制和光无线传输，照明通信终端 130则利用光敏二极管等光传感器 接收光线， 并获得信息。 白光即照明光可以以人眼无法感测的速度进行闪 烁的方法来传送数据， 因而允许采用现有的照明基础设施， 只需稍作改动， 比如用照明光 LED来替换白炽灯光源， 既保证光无线通信， 又可满足照明 的需要。 当然， 该照明光也可以以明暗变换的方式来传输数据。 本文所说 的照明光 LED也可称为白光 LED或白色 LED。
在图 1中， 照明通信终端 130位于通信终端 140的内部， 当然照明通信终 端 130也可以位于通信终端 140的外部， 这样， 两者分别独立存在， 此时， 一个照明通信终端 130可以为一个或多个通信终端 140提供服务， 即此时一 个照明通信终端 130可以与一个或一个以上通信终端 140之间进行有线或无 线传输。
参见图 2a, 上述照明通信装置 120中包括光发射器 121、 光接收器 122, 有线接口接收单元 123和有线接口发送单元 124, 其中， 有线接口接收单元 123通过有线线缆将来自远端通信设备 110的信源信号转换为光发射器 121 能够识别的信号后传送给光发射器 121 , 光发射器 121用于将接收到的信源 信号转换为光信号， 并以光信号的方式进行无线传输； 光接收器 122用于接 收来自照明通信终端 130的光信号， 将接收到的光信号转换为电信号， 传递 给有线接口发送单元 124, 由有线接口发送单元 124将接收到的信号通过有 线线缆传送给远端通信设备 110。
参见图 2a，上述照明通信终端 130中包括光接收器 131 ,光发射器 132、 电解调器 133和电调制器 134, 其中， 光接收器 131用于将接收到的光信 号转换为电信号后传送给电解调器 133; 电解调器 133用于对接收到的信 号^:解调处理后， 传送给通信终端 140; 电调制器 134用于对来自通信终 端 140的信号做调制处理后， 发送给光发射器 132; 光发射器 132用于将 接收到的来自电调制器 134的信号转换为光信号， 进行无线传输。
参见图 2a, 上述远端通信设备 110中包含核心处理单元 111 , 电调制 器 112， 电解调器 113 , 有线接口发送单元 114和有线接口接收单元 115, 其中， 核心处理单元 111用于接收或产生信源信号， 将该信源信号发送给 电调制器 112, 或者， 用于对来自电解调器 113 的信号进行处理， 电调制 器 112用于对来自核心处理单元 111的信号做调制处理后， 发送给有线接 口发送单元 114， 有线接口发送单元 114通过有线线缆将接收到的信号传 送给照明通信装置 120; 有线接口接收单元 1 15通过有线线缆接收来自照 明通信装置 120的信号， 并将该信号传送给电解调器 1 13 , 电解调器 1 13 对接收到的信号做解调处理后， 传送给核心处理单元 1 1 1。
参见图 2b,其是本发明实施例二的照明光无线通信系统结构功能框图， 其与图 2a所示实施例的区别是： 在图 2a中， 远端通信设备 110和照明通 信装置 120之间通过有线线缆的方式实现传输， 在图 2b中， 远端通信设备 110和照明通信装置 120之间通过无线方式实现传输， 其余均与图 2a所示 实施例相同。 也就是说， 如果将所有接口单元分为接口发送单元和接口接 收单元两大类， 则在图 2a中， 所述接口发送单元和接口接收单元分别为有 线接口发送单元和有线接口接收单元， 在图 2b中， 所述接口发送单元和接 口接收单元分别为无线接口发送单元和无线接口接收单元， 其余相同之处 不再赘述。
参见图 2c,其是本发明实施例三的照明光无线通信系统结构功能框图， 其与图 2a所示实施例的区别是：将照明通信终端 130内的电解调器和电调 制器移至通信照明装置 120内，此时，通信照明装置 120和明通信终端 130 的内部结构及完成的操作如下：
照明通信装置 120中包括光发射器 121、 光接收器 122、有线接口接收 单元 123、 有线接口发送单元 124, 电调制器 128和电解调器 127。 有线接 口接收单元 123用于接收来自远端通信设备 110的信源信号， 并将该信号 转换为电解调器 127能够识别的信号后传送给电解调器 127; 电解调器 127 对接收到的信号做解调处理后传送给光发射器 121 ; 光发射器 121将接收 到的信号转换为光信号， 并以光信号的方式进行无线传输。 光接收器 122 接收来自照明通信终端 130的光信号， 将接收到的光信号转换为电信号， 传送给电调制器 128; 电调制器 128对接收到的信号#丈调制处理后发送给 有线接口发送单元 124; 由有线接口发送单元 124将接收到的信号传送给 远端通信设备 110。
照明通信终端 130中包括光发射器 132和光接收器 131。光接收器 13 1 将接收到的光信号转换为电信号后传送给通信终端 140; 光发射器 132将 接收到的来自通信终端 140的信号转换为光信号， 以光信号的方式进行无 线传输。
参见图 2d，其是本发明实施例四的照明光无线通信系统结构功能框图， 其与图 2c所示实施例的区别是： 在图 2c中， 远端通信设备 110和照明通 信装置 120之间通过有线线缆的方式实现传输， 在图 2d中， 远端通信设备 110和照明通信装置 120之间通过无线的方式实现传输， 其余均与图 2c所 示实施例相同。 也就是说， 在图： 2c中， 所述接口发送单元和接口接收单元 分别为有线接口发送单元和有线接口接收单元， 在图 2d中， 所述接口发送 单元和接口接收单元分别为无线接口发送单元和无线接口接收单元。
以上所述所有有线接口接收单元主要由阻抗匹配电路和前置放大器构 成， 阻抗匹配电路用于内部通信单元与有线线缆间进行阻抗变换和适配， 前置放大器用于对信号进行前置放大处理。 以上所述所有无线接口接收单 元主要由接收天线和无线接收机构成， 用于对无线信号进行接收处理， 如 低躁放大和下变频处理。
类似的， 以上所述所有有线接口发送单元主要由阻抗匹配电路和功率 放大器构成， 阻抗匹配电路用于内部通信单元与有线线缆间进行阻抗变换 和适配， 功率放大器用于对信号进行功率放大处理。 以上所述所有无线接 口发送单元主要由发射天线和无线发射机构成， 用于对无线信号进行发射 上变频处理和功率放大处理。
参见图 2a ~图 2d，图中所有的光发射器其实际是相同的，都是基于 LED 或 LED阵列的光发射器， 参见图 3， 光发射器中包括滤波器 310, 驱动电路 320, 白色 LED或 LED阵列 330。 滤波器 310用于滤除信号外噪声； 驱动电路 320用于接收滤波器的输出信号， 产生正向电流通过组件， 对白色 LED或 LED阵列 330提供直流偏置； 白色 LED或 LED阵列 330用于根据输入信号进 行光强度调制， 通过光信号进行无线传输。 当然， 如果光发射器中不包括 滤波器 310也是成立的， 只是这样会有干扰， 效果不好。
如果光无线通信系统采用频分默工模式（FDD ) 的方式， 则对于本发 明的照明通信终端和照明通信装置中的光发射器而言， 两者中的一个为照 明光发射器， 另一个为红外光发射器； 如果光无线通信系统采用时分双工 模式（TDD ) 的方式， 则对于本发明的照明通信终端和照明通信装置中的 光发射器而言， 两者可以皆为照明光发射器， 或者其中一个为照明光发射 器， 另一个为红外光发射器。 红外光发射器和照明光发射器的差別主要是 所采用的 LED不同， 红外光发射器采用红外 LED, 而照明光发射器采用照 明光 LED或照明光 LED阵列， 也就是说， 对于照明光 LED或照明光 LED阵 列， 其不仅用于以光的形式传输数据， 还用于照明。
照明光 LED或照明光 LED阵列发射的可见光波长范围为 380nm ~ 780nm, 输入的调制信号通过引起照明光 LED的导通电流的变化， 进行直 接光强度调制 （ Intensity Modulation ) 。
照明光 LED或照明光 LED阵列驱动电路的主要目标是产生正向电流通 过组件， 这可采用恒压源或恒流源来实现。
图 4(a) 是成本最低的解决方案， 它将照明光 LED串联一个镇流电阻 (RB), 再于电路的两端加上恒压源。 由于镇流电阻会限制通过的电流， 而 照明光 LED的非线性 V-I曲线也会让这种方法的稳流能力非常差； 此外， 只 要外加电压或照明光 LED的正向电压 (VF)有任何变动， 照明光 LED的电流 都会改变， 因而这种照明光 LED电流的极端改变会影响显示器亮度， 这是 许多应用无法接受的。
图 4 (b)是一种较为理想的解决方案， 其采用恒流源的方式来实现。 具 体为直接针对电流感测电阻的两端电压进行稳压 , 此时通过照明光 LED的 电流是由电源供应的参考电压值和电流感测电阻值来决定。 绝大多数显示 器都需要多个照明光 LED, 若要灵活地驱动多个照明光 LED， 应将所有照 明光 LED串联， 确保每颗照明光 LED的电流都相同。 若要以并联方式推动 照明光 LED, 每个照明光 LED都必须串联一个镇流电阻， 避免通过它们的 电流出现差异， 但是这些电阻也会浪费功率， 降低电路效率。 该方式能避 免照明光 LED正向电压改变而造成的电流变动， 只要使用可控制的恒定正 向电流， 就能提供可控制的恒定显示亮度。 恒流源的产生非常简单， 控制 器不需将电源输出稳压。
图 4(a)和图 4 (b)只是两种具体的实施方式，在实际操作中还可以采用其 他的实现方式， 但无论采用那种方式， 其本质都是应用恒压源或恒流源来 实现。 参见图 2a ~ ® 2d, 图中所有的光接收器其实际也是相同的， 参见图 5， 光接收器包括驱动电路 510， 光检测器 520和滤波器 530。 光检测器 520在驱 动电路 510的驱动下， 接收光信号， 并将接收到的光信号转换为电信号后传 送给滤波器 530; 滤波器 530用于滤除信号外噪声， 并将滤波后的信号传送 给电解调器。 当然， 如果光接收器中不包括滤波器 530也是成立的， 只是这 样会有干扰， 效果不好。
同样的， 如果光无线通信系统采用 FDD方式， 则对本发明的照明通信 终端和照明通信装置中的光接收器而言， 两者中的一个为照明光接收器 , 另一个为红外光接收器； 如果光无线通信系统采用 TDD方式， 则对于本发 明的照明通信终端和照明通信装置的中光接收器而言， 两者可以皆为照明 光接收器， 或者其中一个为照明光接收器， 另一个为红外光接收器。 红外 光接收器和照明光接收器的差别主要是所采用的光敏二极管不同， 红外光 接收器采用红外光敏二极管， 照明光接收器采用照明光光敏二极管， 其也 被称之为白光光敏二极管。
白光光敏二极管， 利用直接检测（ Direct Detection )技术将已被信息调 制的可见光信号即照明光信号， 波长范围为 380nm ~ 780nm的信号， 转换为 电信号， 它相当于电通信系统中的检波器。
另外， 光检测器也可以用太阳能电池板来实现， 太阳能电池板除将已 皮信息调制的可见光信号， 即本发明中波长范围为 380nm - 780nm的信号， 转换为电信号外，还能利用可见光的光能即照明光能为其所在的设备供电。
需要说明的是， 对于上下行传输中， 至少有一条线路必须采用照明光 发射器，以在传输数据的同时实现照明功能，即光发射器 121和光发射器 132 中至少一个采用照明光发射器， 相应的， 光接收器 122和光接收器 131要与 之相匹配。
参见图 2a ~ ® 2d, 图中所有电调制器和电解调器其实际也是相同的， 且可以是基于正交频分复用（OFDM )技术的电调制器和电解调器，也可以 是基于扩频技术的电调制器和电解调器， 还可以是基于以太网物理层的电 调制器和电解调器。 当然， 实际应用中并不限于此， 此仅为几种实施例而 已。 参见图 6和图 7, 其分別为基于 OFDM技术的电调制器和电解调器的原 理功能框图。
参见图 6， 基于 OFDM技术的电调制器包括信道编码单元 610, 符号映 射单元 620和 OFDM调制器 630; 其中， 信道编码单元 610用于接收待发送信 号并对该信号进行信道编码处理， 之后， 由符号映射单元 620对经信道编码 后的信号作数字调制的星座图符号映射处理， OFDM调制器 630用于对经符 号映射后的符号作 OFDM调制处理。
参见图 7， 基于 OFDM技术的电解调器包括信道解码单元 730, 符号解 映射单元 720和 OFDM解调器 710, 其中， OFDM解调器 710用于对接收到的 信号作 OFDM解调处理， 符号解映射单元 720用于对经 OFDM解调后的信号 作数字调制的星座图符号解映射处理 ,信道解码单元 730用于对接收到的信 号进行信道解码处理。
当照明通信装置 120和远端通信设备 110间使用有线线缆的方式实现连 接， 且采用基于 OFDM技术的电调制器和电解调器时， 如果有线线缆为电 话线， 则采用数字用户线（xDSL )电调制器和电解调器； 如果有线线缆为 有线电视（CATV ) 电缆， 则采用电缆（Cable ) 电调制器和电解调器； 如 果有线线缆为电源线， 则采用电力线通信（PLC ) 电调制器和电解调器。 采用基于 OFDM技术的电调制器和电解调器时， 其优点是： （1)频谱利用率 高， 理论上可以达到 Shannon信息论的极限； （2) 能有效克服符号间干扰 ( ISI ) ； (3) 能有效抵抗信道衰落， OFDM技术把频率选择性衰落信道划 为多个并行的相关的平坦衰落信道， 因此采用筒单的信道均衡技术就能满 足系统性能要求， 不需要采用复杂的自适应均衡技术； （4)抗噪声干扰， OFDM对倌道噪声干扰的克服是通过子信道分配来卖现的； （5)适合高速数 据传输。 因而， 能够抗多径干扰， 避免光无线信道和有线线缆信道的时延 扩展， 提高照明光 LED的调制速率。
当照明通信装置 120和远端通信设备 110间使用有线线缆的方式实现连 接， 且采用基于扩频技术的电调制器和电解调器时， 远端通信设备的电调 制器和电解调器可以为基于直接序列扩频 （DS: Direct Sequence Spread Spectrum 简称直扩）技术的电调制器和电解调器，也可以是基于调频（FH, Frequency Hopping )技术的电调制器和电解调器， 还可以是基于跳时（TH: Time Hopping ) 、 线性调频（Chirp )等技术的电调制器和电解调器。 采用 基于扩频技术的电调制器和电解调器时， 其优点是： (1)频谱密度低， 对其 它系统的电磁干扰小； （2)抗干扰性强， 误码率低； （3)具有信息保密性； (4)可以实现码分多址。
下面对基于 OFDM技术的电调制器和电解调器做一简介。
图 8是图 6中 OFDM调制器的原理功能框图， 通信数据的二进制信息经 信道编码后， 首先进行数字调制、 串并转换（或先进行串并转换， 再数字 调制）， 变为 M路并行传输的数据序列^^ )}， k = 0,l...N - i j N为子载波个 数。 快速傅里叶逆变换 （ IFFT ) 单元将其转化为时域序列 ， n = ,l,...N - l a 随后加入循环前缀 CP, 再经过并串转换后将该序列送往功率 放大器。
图 9是图 7中 OFDM解调器的原理功能框图， 接收到信号的前置放大器 将接收信号放大后， 经过删除循环前缀和串并转换处理后， 信号表示为
" = 0，1,..JV- 1 , N为子载波个数。 之后进行快速傅里叶变换（FFT ) 操作后得到频域信号 ^W} , = 0，1 N - 1。 然后， ^故数字解调和并串转换
(或先进行并串转换和再数字解调）处理， 信道解码后得到通信数据的二 进制信息。
下面对基于扩频技术的电调制器和电解调器做一简介。
参见图 10和图 11 , 其分别为基于 DS技术的电调制器和电解调器的原理 功能框图。
参见图 10, 基于 DS技术的调制器（该方式频谱的扩展是直接由高码率 的扩频码序列进行调制而得到的） ： 发送端输入的携带共存协商信令的二 进制信息， 经信道编码后， 由扩频码发生器产生的扩频码序列去调制以展 宽信号的频谱， 再经过数字调制器进行调制处理后， 发送出去。 扩频码序 列可采用伪随机码 (PN码）序列， 该序列有较优良的自相关和互相关特性。
参见图 11 , 基于 DS技术的解调器： 在接收端收到的含有噪声的宽带信 息信号， 先经过数字解调， 然后通过本地产生的与发送端相同的扩频码序 列进行扩频解调， 再经过窄带滤波器、 信道解码， 恢复出携带共存协商信 令的二进制信息。
参见图 12和图 13 , 其分别为基于 FH技术的电调制器和电解调器的原理 功能框图。
参见图 12, 基于 FH技术的调制器： 发送端输入的携带共存协商信令的 二进制信息， 经信道编码后， 再经过数字调制器进行调制处理， 然后数字 调制器和由扩频码发生器产生的扩频码序列控制的频率合成器的输出频率 进行混频， 以展宽信号的频谱， 之后发送出去。 扩频码序列可采用伪随机 码 (PN码）序列， 该序列有较优良的自相关和互相关特性。
参见图 13， 基于 FH技术的电解调器： 在接收端收到的含有噪声的宽带 信息信号， 先经过数字解调， 和由本地产生的与发送端相同的扩频码序列 进行控制的频率合成器的输出频率进行混频 ,再经过数字解调和信道解码， 恢复出携带共存协商信令的二进制信息。
以上所述通信终端包括但不限于电脑， 手机， 传真机， 电话， PDA，， 网络电视等，远端通信设备包括但不限于电脑，手机，传真机， 电话， PDA， 网络电视等， 其中， 远端通信设备与通信终端可以是相同的设备也可以是 不同的设备。
通过以上实现方案可以看出， 本发明除家庭应用， 还特别适合于以下 应用场景： 在有强电磁干 ^；的场所； 一些不宜布线的场所， 比如在具有纪 念意义的古建筑， 危险性大的工厂、 车间; 在走线成本高、 施工难度大或 经市政部门审批困难的场合， 如马路两侧建筑物之间； 一些临时性的场所， 如展览厅、 短期租用的商务办公室； 一些具有移动性的场合， 如使用便携 电脑的交易大厅等。 可见， 无论室内室外均适用。
以上所述仅是本发明的优选实施方式， 应当指出， 对于本技术领域的 普通技术人员来说， 在不脱离本发明原理的前提下， 还可以做出若干改进 和润饰， 这些改进和润饰也应视为本发明的保护范围。

Claims

权 利 要 求
1、一种照明光无线通信系统，用于照明以及与远端通信设备进行通信， 其特征在于， 该系统包含照明通信装置， 照明通信终端和通信终端， 其中， 所述照明通信装置， 用于接收来自远端通信设备的信源信号； 将接收 到的信源信号转换为光信号， 并以光信号的方式进行无线传输； 接收光信 号， 将接收到的光信号转换为电信号， 传送给远端通信设备； 其中， 所述 照明通信装置接收或发送的光信号之一或两者均为照明光；
所述照明通信终端， 用于将接收到的光信号转换为电信号后传送给通 信终端； 将来自通信终端的待发送电信号转换为光信号后无线传输给照明 通信装置；
所述通信终端， 用于接收来自照明通信终端的电信号， 进行相应处理， 或将处理后的电信号发送给照明通信终端。
2、 根据权利要求 1所述的系统， 其特征在于， 所述照明通信装置中包 括光发射器、 光接收器、 接口接收单元和接口发送单元， 其中，
所述接口接收单元， 用于接收来自远端通信设备的信源信号， 并将该 信号转换为光发射器能够识别的信号后传送给光发射器；
所述光发射器， 用于将接收到的信号转换为光信号， 并以光信号的方 式进行无线传输； ―
所述光接收器， 用于接收来自照明通信终端的光信号， 将接收到的光 信号转换为电信号， 传送给接口发送单元；
所述接口发送单元， 将接收到的信号传送给远端通信设备。
3、 根据权利要求 2所述的系统， 其特征在于, 所述照明通信终端中包 括光发射器、 电解调器、 电调制器和光接收器，
所述光接收器， 用于将接收到的光信号转换为电信号后传送给电解调 器；
所述电解调器， 用于对接收到的信号做解调处理后传送给通信终端； 所述电调制器， 用于对来自通信终端的信号做调制处理后发送给光发射 器；
所述光发射器， 用于将接收到的来自电调制器的信号转换为光信号， 以光信号的方式进行无线传输。
4、 根据权利要求 1所述的系统， 其特征在于， 所述照明通信装置中包 括光发射器、 光接收器、 接口接收单元、 接口发送单元， 电调制器和电解 调器， 其中，
所述接口接收单元， 用于接收来自远端通信设备的信源信号， 并将该 信号转换为电解调器能够识别的信号后传送给电解调器；
所述电解调器， 用于对接收到的信号做解调处理后传送给光发射器； 所述光发射器， 用于将接收到的信号转换为光信号， 并以光信号的方 式进行无线传输；
所述光接收器， 用于接收来自照明通信终端的光信号， 将接收到的光 信号转换为电信号， 传送给电调制器；
所述电调制器， 用于对接收到的信号故调制处理后发送给接口发送单 元；
所述接口发送单元， 将接收到的信号传送给远端通信设备。
5、 根据权利要求 4所述的系统， 其特征在于， 所述照明通信终端中包 括光发射器和光接收器，
所述光接收器， 用于将接收到的光信号转换为电信号后传送给通信终 端；
所述光发射器， 用于将接收到的来自通信终端的信号转换为光信号， 以光信号的方式进行无线传输。
6、 根据权利要求 2 5任一所述的系统， 其特征在于， 所述光发射器 为基于发光二极管 LED或 LED阵列的光发射器。
7、 根据权利要求 6所述的系统， 其特征在于， 所述基于 LED或 LED 阵列的光发射器至少包括驱动电路和 LED或 LED阵列； 其中，
所述驱动电路， 用于对信号进行驱动， 对 LED或 LED阵列提供直流 偏置；
所述 LED或 LED阵列， 用于根据输入信号进行光强度调制， 通过光 信号进行无线传输。
8、 根据权利要求 7所述的系统， 其特征在于， 所述基于 LED或 LED 阵列的光发射器进一步包括滤波器， 其中， 所述滤波器， 用于滤除信号外 噪声， 并将滤波后的信号传送给驱动电路。
9、 根据权利要求 7所述的系统， 其特征在于， 所述 LED或 LED阵列 为红外 LED或 LED阵列， 或者为照明光 LED或 LED阵列；
当所述 LED或 LED阵列为照明光 LED或 LED阵列时，该 LED或 LED 阵列进一步用于照明。
10、 根据权利要求 2 ~ 5任一所述的系统， 其特征在于， 所述光接收器 包括驱动电路， 光检测器， 滤波器，
所述驱动电路， 用于驱动光检测器， 对光检测器提供直流偏置； 所述 光检测器在驱动电路的驱动下， 接收光信号， 并将接收到的光信号转换为 电信号 ^传送给滤波器； 所述滤波器， 用于滤除信号外噪声， 并将滤波后 的信号传送给电解调器；
所述光检测器为红外光检测器或照明光检测器。
11、 根据权利要求 10所述的系统， 其特征在于， 所述光检测器为光敏 二极管或太阳能电池板；
当所述光信号为照明光时， 所述光敏二极管为照明光光敏二极管； 当所述光信号为红外光时， 所述光敏二极管为红外光光敏二极管。
12、 居权利要求 2或 4所述的系统， 其特征在于， 所述接口接收单 元为有线接口接收单元， 所述接口发送单元为有线接口发送单元； 或者， 所述接口接收单元为无线接口接收单元， 所述接口发送单元为无线接口发 送单元。
13、 根据权利要求 3或 4所述的系统， 其特征在于，
所述电调制器为基于正交频分复用 OFDM技术的电调制器，或基于扩频 技术的电调制器， 或以太网物理层电调制器；
所述电解调器为基于 OFDM技术的电解调器，或基于扩频技术的电解调 器， 或以太网物理层电解调器。
14、 根据权利要求 13所述的系统， 其特征在于，
所述基于 OFDM技术的电调制器包括信道编码单元， 符号映射单元， OFDM调制器； 其中， 信道编码单元用于接收待发送信号并对该信号进行 信道编码处理， 符号映射单元用于对经信道编码后的信号作数字调制的星 座图符号映射处理， OFDM调制器用于对经符号映射后的符号作 OFDM调 制处理；
所述基于 OFDM技术的电解调器包括， 信道解码单元， 符号解映射单 元， OFDM解调器， 其中， OFDM解调器用于对接收到的信号作 OFDM解 调处理，符号解映射单元用于对经 OFDM解调后的信号作数字调制的星座 图符号解映射处理，信道解码单元用于对接收到的信号进行信道解码处理。
15、 根据权利要求 13所述的系统， 其特征在于，
所述基于 OFDM技术的电调制器为数字用户线 xDSL电调制器， 或电 缆 Cable电调制器， 或电力线通信 PLC电调制器；
所述基于 OFDM技术的电解调器为 xDSL电解调器， 或 Cable电解调 器， 或 PLC电解调器。
16、 根据权利要求 13所述的系统， 其特征在于， 所基于述扩频技术的 电调制器和电解调器为：基于直接序列扩频 DS技术，或基于调频 FH技术， 或基于跳时 TH技术、 或基于线性调频 Chirp技术的电调制器和电解调器。
17、 根据权利要求 12所述的系统， 其特征在于， 当所述接口接收单元 为有线接口接收单元， 接口发送单元为有线接口发送单元时， 所述照明通 信装置与远端通信设备直接通过有线线缆的方式实现连接， 且所述有线线 缆为电话线， 或 CATV电缆， 或以太网线， 或电源线。
18、 根据权利要求 1所述的系统， 其特征在于， 所述照明通信终端位 于通信终端内部， 或通信终端外部；
当照明通信终端位于通信终端外部时， 一个照明通信终端与一个或一 个以上通信终端之间进行有线或无线传输。
19、 根据权利要求 1所述的系统， 其特征在于， 所述通信终端为电脑， 或手机， 或传真机， 或固定电话， 或 PDA, 或网络电视。
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