WO2012122937A1 - 一种数据传输方法及相关设备、系统 - Google Patents

一种数据传输方法及相关设备、系统 Download PDF

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Publication number
WO2012122937A1
WO2012122937A1 PCT/CN2012/072311 CN2012072311W WO2012122937A1 WO 2012122937 A1 WO2012122937 A1 WO 2012122937A1 CN 2012072311 W CN2012072311 W CN 2012072311W WO 2012122937 A1 WO2012122937 A1 WO 2012122937A1
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WIPO (PCT)
Prior art keywords
data
time domain
transmitting end
baseband signal
downlink
Prior art date
Application number
PCT/CN2012/072311
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English (en)
French (fr)
Inventor
刘晟
余荣道
王锐
Original Assignee
华为技术有限公司
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.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP12757070.3A priority Critical patent/EP2683100A4/en
Publication of WO2012122937A1 publication Critical patent/WO2012122937A1/zh
Priority to US14/026,865 priority patent/US8873657B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114Indoor or close-range type systems
    • H04B10/116Visible light communication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/40Transceivers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/0008Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2602Signal structure
    • H04L27/2605Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2697Multicarrier modulation systems in combination with other modulation techniques
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0014Three-dimensional division
    • H04L5/0023Time-frequency-space
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming

Definitions

  • the present invention relates to the field of data transmission, and in particular, to a data transmission method and related devices and systems. Background technique
  • radio frequency communication for example, in a Long Term Evolution (LTE) system, data transmission is implemented based on radio frequency communication, that is, LTE over RF.
  • LTE Long Term Evolution
  • RF communication not only needs to occupy a certain amount of wireless spectrum, but also causes the wireless spectrum resources to become more and more tense, and the radio frequency communication is easy to be electromagnetic interference, especially the interference of the cell edge users is the most serious; on the other hand, the radio frequency communication is still It will cause certain radiation to the human body.
  • embodiments of the present invention provide a data transmission method and related device and system, which are capable of realizing data transmission without being restricted by transmission resources, without electromagnetic interference, and without radiation to the human body.
  • a data transmission method includes: transmitting, by the transmitting end, downlink user data, scrambling, constellation modulation mapping, and multiple input multiple output precoding processing to obtain a precoding symbol sequence; and the transmitting end is configured to use the precoding symbol sequence Performing time-frequency resource mapping to obtain frequency domain data of orthogonal frequency division multiplexing symbols; the transmitting end performs conjugate symmetric expansion on frequency domain data of the orthogonal frequency division multiplexing symbol and An inverse fast Fourier transform, obtaining a time domain real number sequence; the transmitting end inserts a cyclic prefix processing on the time domain real sequence to form a first downlink time domain baseband signal; and the transmitting end uses the first downlink time
  • the domain baseband signal is applied to the direct current of the LED lighting circuit to form an LED driving electrical signal; the transmitting end converts the LED driving electrical signal into a visible light beam of the LED for transmission.
  • the data transmission method includes: the transmitting end sequentially performs uplink user data scrambling, constellation modulation mapping, multiple input multiple output precoding, and discrete Fourier transform processing to obtain a discrete Fourier transform symbol sequence;
  • the discrete Fourier transform symbol sequence performs single carrier frequency division multiplexing resource mapping to obtain frequency domain data of a single carrier frequency division multiplexing symbol;
  • the transmitting end performs a total of frequency domain data of the single carrier frequency division multiplexing symbol a yoke symmetric extension and an inverse fast Fourier transform to obtain a time domain real number sequence;
  • the transmitting end inserts a cyclic prefix processing on the time domain real sequence to form a first uplink time domain baseband signal;
  • the transmitting end will be the first
  • the uplink time domain baseband signal is applied to the direct current of the LED lighting circuit to form an LED driving electrical signal; and the transmitting end converts the LED driving electrical signal into a visible light beam of the LED for transmission.
  • the transmitting end includes: a first processing unit, configured to perform downlink scrambling, constellation modulation mapping, and multiple input multiple output precoding processing on the downlink user data to obtain a precoding symbol sequence; a second processing unit, configured to perform time-frequency resource mapping on the pre-coded symbol sequence obtained by the first processing unit, to obtain frequency-domain data of orthogonal frequency division multiplexing symbols, and a third processing unit, configured to The frequency domain data of the orthogonal frequency division multiplexing symbol obtained by the second processing unit is conjugate symmetrically extended; the fourth processing unit is configured to perform conjugate symmetrically extended frequency domain data on the third processing unit Performing an inverse fast Fourier transform to obtain a time domain real number sequence; a fifth processing unit, configured to perform insertion cycle prefix processing on the time domain real sequence obtained by the fourth processing unit to form a first downlink time domain baseband signal; a sixth processing unit, configured to load the first downlink time domain baseband signal into a direct current of the LED lighting circuit to form an LED driving electrical signal; and a seventh
  • the other transmitting end includes: a first processing module, configured to sequentially perform uplink scrambling, constellation modulation mapping, multiple input multiple output precoding, and discrete Fourier transform processing to obtain a discrete Fourier transform symbol sequence; a second processing module, configured to perform the single carrier frequency division multiplexing resource mapping by using the discrete Fourier transform symbol sequence obtained by the first processing module, to obtain frequency domain data of a single carrier frequency division multiplexing symbol; And performing conjugate symmetric expansion on the frequency domain data of the single carrier frequency division multiplexed symbol obtained by the second processing module; and a fourth processing module, configured to perform conjugate symmetric expansion on the third processing module
  • the frequency domain data is subjected to an inverse fast Fourier transform to obtain a time domain real number sequence.
  • the fifth processing module is configured to perform insertion cycle prefix processing on the time domain real sequence obtained by the fourth processing module to form a first uplink time domain baseband signal. ; a sixth processing module, configured to load the first uplink time domain baseband signal into a direct current of the LED lighting circuit to form an LED driving electrical signal; and a seventh processing module, configured to convert the LED driving electrical signal The visible light beam of the light emitting diode is transmitted.
  • a data transmission system comprising: a transmitting end, configured to sequentially perform downlink scrambling, constellation modulation mapping, and multiple input multiple output precoding processing to obtain a precoding symbol sequence; and performing the precoding symbol sequence
  • Time-frequency resource mapping obtaining frequency domain data of orthogonal frequency division multiplexing symbols; performing conjugate symmetric expansion and inverse fast Fourier transform on frequency domain data of the orthogonal frequency division multiplexing symbols to obtain a time domain real number sequence;
  • the time domain real sequence is inserted into a cyclic prefix process to form a first downlink time domain baseband signal; the first downlink time domain baseband signal is loaded onto a direct current of the LED lighting circuit to form an LED driving electrical signal; And converting the LED driving electrical signal into a visible light beam of the LED for transmission;
  • receiving end configured to receive a visible light beam of the LED and perform photoelectric conversion to obtain a first downlink time domain baseband signal;
  • the data transmission system includes: a transmitting end, configured to sequentially perform uplink user data scrambling, constellation modulation mapping, multiple input multiple output precoding, and discrete Fourier transform processing to obtain a discrete Fourier transform symbol sequence; Performing single-carrier frequency division multiplexing resource mapping on the discrete Fourier transform symbol sequence to obtain frequency domain data of single carrier frequency division multiplexing symbols; performing conjugate symmetric expansion and fast on frequency domain data of the single carrier frequency division multiplexing symbol Performing an inverse Fourier transform to obtain a time domain real number sequence; performing interpolation cycle prefix processing on the time domain real number sequence to form a first uplink time domain baseband signal; and loading the first uplink time domain baseband signal into a direct current of the LED lighting circuit Forming an LED to drive an electrical signal; and
  • the photodiode driving electrical signal is converted into a visible light beam of the light emitting diode for transmission; the receiving end is configured to receive the visible light beam of the light emitting diode and perform photoelectric conversion to obtain a first uplink
  • the transmitting end after obtaining the frequency domain data of the orthogonal frequency division multiplexing symbol in the downlink direction, performs conjugate symmetric expansion and inverse fast Fourier transform on the frequency domain data of the orthogonal frequency division multiplexing symbol, thereby Obtaining a time domain real number sequence, and performing insertion cycle prefix processing to form a first downlink time domain baseband signal, wherein the first downlink time domain baseband signal is loaded onto a direct current of the LED lighting circuit to form an LED driving electrical signal, Therefore, the transmitting end can convert the LED driving electric signal into a visible light beam of the LED for transmission.
  • the transmitting end after obtaining the frequency domain data of the single carrier frequency division multiplexing symbol in the uplink direction, performs conjugate symmetric expansion and inverse fast Fourier transform on the frequency domain data of the single carrier frequency division multiplexing symbol. Therefore, a time domain real number sequence can be obtained, and the insertion cyclic prefix process is performed to form a first uplink time domain baseband signal, and the first uplink time domain baseband signal is loaded onto the direct current of the LED lighting circuit to form an LED driving electrical signal, thereby The transmitting end can convert the LED driving electrical signal into a visible light beam of the LED for transmission. It can be seen that the embodiment of the present invention can realize data transmission by using visible light of the light emitting diode.
  • visible light transmission does not require radio frequency transmission and is not regulated by relevant governments and organizations, visible light transmission is not limited by transmission resources. In addition, visible light transmission is not subject to electromagnetic interference and will not affect user reception performance and experience. It does not cause radiation to the human body.
  • FIG. 1 is a schematic structural diagram of a downlink transmitting end of an existing LTE over RF; 2 is a schematic flowchart of a data transmission method according to an embodiment of the present invention; FIG. 3 is a schematic structural diagram of a downlink transmitting end used to implement the data transmission method described in FIG. 2 according to an embodiment of the present invention;
  • FIG. 4 is a schematic diagram of conjugate symmetry of frequency domain data of an OFDM symbol according to an embodiment of the present invention.
  • FIG. 5 is a schematic flow chart of a data processing method of a downlink receiving end according to an embodiment of the present disclosure
  • FIG. 6 is a schematic structural diagram of a downlink receiving end of an LTE over VLC according to an embodiment of the present disclosure
  • FIG. 7 is a schematic diagram of a layout of an indoor LED light group according to an embodiment of the present invention.
  • Figure 8 is a schematic diagram of a visible beam transmission data of the LED lamp set shown in Figure 7;
  • FIG. 9 is a schematic diagram of another visible beam transmission data of the LED lamp group shown in FIG. 7.
  • FIG. 10 is a schematic diagram of still another visible beam transmission data of the LED lamp group shown in FIG. 7.
  • FIG. 12 is a schematic flowchart of another data transmission method according to an embodiment of the present invention
  • FIG. 13 is a schematic structural diagram of an uplink transmitting end used to implement the data transmission method described in FIG. 12 according to an embodiment of the present disclosure
  • FIG. 14 is a schematic flowchart diagram of a data processing method of an uplink receiving end according to an embodiment of the present disclosure
  • FIG. 15 is a schematic structural diagram of an uplink receiving end of an LTE over VLC according to an embodiment of the present disclosure
  • FIG. 16 is a schematic structural diagram of another downlink transmitting end according to an embodiment of the present disclosure.
  • Figure 17 is a detailed view of the downlink transmitting end shown in Figure 16;
  • 18 is a schematic diagram of conjugate symmetric extension of a sequence of precoded symbols
  • FIG. 19 is a schematic structural diagram of another downlink receiving end according to an embodiment of the present disclosure.
  • FIG. 20 is a schematic diagram of a downlink time domain baseband signal processing module in the downlink receiving end shown in FIG. 19;
  • FIG. 21 is a schematic structural diagram of another downlink transmitting end according to an embodiment of the present invention;
  • FIG. 22 is a schematic structural diagram of another downlink receiving end according to an embodiment of the present invention;
  • FIG. 23 is a detailed diagram of a downlink time domain baseband signal processing module in the downlink receiving end shown in FIG. 22;
  • FIG. 24 is a schematic structural diagram of an uplink transmitting end according to an embodiment of the present disclosure.
  • 25 is a detailed diagram of generating an uplink time domain baseband signal module in the uplink transmitting end shown in FIG. 24;
  • FIG. 26 is a schematic structural diagram of another uplink receiving end according to an embodiment of the present disclosure.
  • FIG. 27 is a schematic structural diagram of another uplink transmitting end according to an embodiment of the present disclosure.
  • FIG. 28 is a schematic structural diagram of another uplink receiving end according to an embodiment of the present disclosure.
  • 29 is a schematic structural diagram of an LED driving module according to an embodiment of the present invention.
  • FIG. 30 is a schematic structural diagram of a transmitting end according to an embodiment of the present invention.
  • FIG. 31 is a schematic structural diagram of another transmitting end according to an embodiment of the present invention.
  • FIG. 32 is a schematic structural diagram of a data transmission system according to an embodiment of the present invention.
  • FIG. 33 is a schematic structural diagram of a data transmission system according to an embodiment of the present invention.
  • a Light Emitting Diode is a solid-state semiconductor device that directly converts electrical energy into visible light.
  • LEDs not only have low power consumption, long service life, small size, and environmental protection, but also have good modulation performance and high response sensitivity.
  • the LED can be used as illumination, and the signal can be converted into a visible beam of the LED for transmission, thereby realizing an emerging optical wireless communication technology, namely visible light communication (Visible) Light Communication, VLC) technology.
  • VLC visible light communication
  • the essence of VLC technology is to use high-speed light and dark flashing signals from LEDs (or fluorescent lamps, etc.) to transmit information.
  • RF radio frequency
  • Embodiments of the present invention provide a data transmission method and related device and system, which are capable of realizing data transmission without being restricted by transmission resources, without electromagnetic interference, and without radiation to the human body.
  • the data transmission method and the related device and system provided by the embodiments of the present invention may be applied to include, but not limited to, an LTE system.
  • the LET system will be described in detail later in the embodiment of the present invention.
  • the traditional LTE system is based on radio frequency communication to realize data transmission, namely LTE over RF.
  • the structure of the downlink transmitting end of the existing LTE over RF is as shown in FIG. 1.
  • the downlink user data (1 ...
  • k is subjected to scrambling, constellation modulation mapping, multiple-input multiple-output (MIMO) precoding, time-frequency resource mapping, and fast Fourier transform.
  • IFFT Inverse Fast Fourier Transform
  • CP Cyclic Prefix
  • the downlink time domain baseband signal is obtained and transmitted through the radio frequency.
  • the signal output through the IFFT is a complex sequence. Since the visible light reception is non-coherent reception, Intensity Modulation (IM) is usually used, which requires the input signal to be a real sequence. Therefore, the downlink time domain baseband signal (complex sequence) outputted by the downlink transmitter shown in FIG. 1 cannot directly drive the LED visible light communication.
  • IM Intensity Modulation
  • FIG. 2 is a schematic flowchart of a data transmission method according to an embodiment of the present invention.
  • the method can implement downlink data transmission without being restricted by transmission resources, without electromagnetic interference, and without radiation to the human body.
  • the method described in FIG. 2 is an application scenario of the LTE system, and those skilled in the art can understand that the data transmission method provided by the embodiment of the present invention can also be applied to other communication systems to implement visible light communication, which is not implemented in the embodiment of the present invention. limited.
  • the data transmission method may include the following steps.
  • the transmitting end performs downlink scrambling, constellation modulation mapping, and MIMO precoding processing on the downlink user data to obtain a precoding symbol sequence.
  • the constellation modulation mapping that can be used at the transmitting end is as follows: Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (Quarature Phase Keying) Shift Keying, QPSK), 16 Quadrature Amplitude Modulation (16QAM), 64 Quadrature Amplitude Modulation (64QAM), etc.
  • BPSK Binary Phase Shift Keying
  • QPSK Quadrature Phase Shift Keying
  • 16QAM 16 Quadrature Amplitude Modulation
  • 64QAM 64 Quadrature Amplitude Modulation
  • OFDM Orthogonal Frequency Division Multiplexing
  • the transmitting end may map the precoding symbol sequence to the time-frequency resource according to the resource mapping rule of different physical channels, so that the frequency domain data of the OFDM symbol can be obtained.
  • the transmitting end performs conjugate symmetric expansion and IFFT on the frequency domain data of the OFDM symbol, and obtains a time domain real sequence.
  • the conjugate symmetric extension of the frequency domain data of the OFDM symbol by the transmitting end refers to adding conjugate symmetric data to the frequency domain data of the OFDM symbol.
  • the IFFT can be performed on the frequency domain data of the OFDM symbol after adding the conjugate symmetric data to obtain a time domain real sequence.
  • the transmitting end inserts a CP process into the time domain real sequence to form a first downlink time domain baseband signal.
  • the transmitting end inserts CP into the above-mentioned time domain real number sequence to resist inter-symbol interference caused by multipath. Since the transmitting end obtains the time domain real sequence in step 203, the first downlink time domain baseband signal formed by the transmitting end in step 204 is also a real sequence.
  • the transmitting end loads the first downlink time domain baseband signal to the DC power of the LED lighting circuit to form an LED driving electrical signal.
  • an LED driving electrical signal can be formed, and the LED driving electrical signal can drive the LED to emit visible light.
  • the transmitting end converts the LED driving electrical signal into a visible light beam of the LED for transmission.
  • the transmitting end may also load the first downlink time domain baseband signal (real sequence) onto the direct current of the fluorescent lighting circuit to form a driving electrical signal of the fluorescent lamp; correspondingly, in the above
  • the transmitting end can convert the driving electric signal of the fluorescent lamp into a visible light beam of the fluorescent lamp for transmission.
  • the transmitting end obtains the frequency domain data of the orthogonal frequency division multiplexing symbol in the downlink direction, performing conjugate symmetric expansion and IFFT on the frequency domain data of the orthogonal frequency division multiplexing symbol, thereby obtaining a real sequence of the domain, and inserting the CP to form a first downlink time domain baseband signal, the first downlink time domain baseband signal being loaded onto the direct current of the LED lighting circuit to form an LED driving electrical signal, so that the transmitting end can use the LED
  • the drive electrical signal is converted into an LED visible beam for transmission.
  • the data downlink transmission can be realized by the visible light of the LED.
  • the visible light transmission does not require the radio frequency transmission certificate and is not regulated by the relevant government or organization, the visible light transmission is not limited by the transmission resource; in addition, the visible light transmission does not Subject to electromagnetic interference, it will not affect the user's receiving performance and experience, nor will it cause radiation to the human body.
  • FIG. 3 is a schematic structural diagram of a downlink transmitting end of an LTE over VLC according to an embodiment of the present invention.
  • the downlink transmitting end may be used to implement the data transmission method described in FIG. 2 .
  • the downlink transmitting end shown in FIG. 3 is a schematic structural diagram of a downlink transmitting end of an LTE over VLC according to an embodiment of the present invention.
  • the downlink transmitting end may be used to implement the data transmission method described in FIG. 2 .
  • the resource mapping manner of the existing LTE over RF is completely reused, and the LTE overVLC equivalent of the signal bandwidth is W. It is an LTE over RF with a signal bandwidth of W/2. For example, an LTE over VLC with a signal bandwidth of 20 MHz is equivalent to LTEoverRF with a signal bandwidth of 10 MHz.
  • the specific process of the downlink transmitting end shown in FIG. 3 for implementing the data transmission method described in FIG. 2 may be as follows:
  • bit sequence of the downlink user data k> (0), >(1), ..., 6(1 ⁇ -1) is scrambled before the constellation modulation mapping, and generates a scrambling bit sequence 0) , ⁇ 1),.. «, 7 -1);
  • the scrambling bit sequence (0), (l),... performs constellation modulation mapping, and generates a complex-valued modulation symbol sequence ⁇ /(0) ⁇ (1), ⁇ (1 ⁇ 6 -1);
  • the constellation modulation mapping methods used are BPSK:, QPSK, 16QAM, and 64QAM. For example, if the QPSK method is used for constellation modulation mapping, bit 00 can be mapped to
  • bit 01 can be mapped to _ ⁇
  • bit 10 can be mapped to - +
  • bit 11 The mapping can be - - .
  • complex-valued modulation symbol sequence ⁇ O ⁇ l ⁇ M ⁇ -l Perform MIMO precoding to generate pre-coded symbol sequence (complex value) y(0), y( ⁇ ), ---, y(M ⁇ mb - ⁇ ) ;
  • the precoding symbol sequence _y(0), _y(l), ..., J « -l) is mapped to the time domain resource, and the OFDM symbol can be obtained.
  • the frequency domain data is a, (0), a, (l), "', a, (Nl);
  • the conjugate symmetric extension can be performed by using the following formula (1) That is, the new data sequence after adding the conjugate symmetric data is used for the IFFT transformation: Wherein, the number of wave data represents a time domain real number sequence.
  • the CP forms a first downlink time domain baseband signal (real sequence); for example, the last G symbols of the OFDM symbol can be copied to the front of the OFDM, and the time domain real sequence after the IFFT is inserted into the CP to form the first A downlink time domain baseband signal (real number order ⁇ l). 8) loading the first downlink time domain baseband signal to the direct current of the LED lighting circuit to form an LED driving electrical signal;
  • FIG. 2 illustrates a data downlink transmission method of LTE over VLC.
  • the embodiment of the present invention further provides a data processing method for the downlink receiving end (similar to the user side terminal), and the implementation process of the data processing method of the downlink receiving end As shown in FIG. 5, the following steps may be included.
  • the receiving end receives the visible beam of the LED and performs photoelectric conversion to obtain a first downlink time domain baseband signal (real sequence).
  • the receiving end may be a mobile phone, a notebook, or other smart device, which is not limited in the embodiment of the present invention.
  • the receiving end photoelectrically converts the received visible beam of the LED to obtain an electrical signal, and the first downlink time domain baseband signal (real sequence) can be extracted from the electrical signal.
  • the receiving end performs de-CP, FFT, and de-conjugation symmetric processing on the obtained first downlink time-domain baseband signal to obtain frequency domain data of the OFDM symbol.
  • the receiving end performs resource demapping processing on the obtained frequency domain data of the OFDM symbol to obtain a precoded symbol sequence.
  • the constellation modulation mapping and the descrambling processing are performed to obtain downlink user data.
  • the foregoing MIMO detection and channel equalization are inverse processes of MIMO precoding, that is, after the receiving end performs MIMO detection and channel equalization on the obtained precoded symbol sequence, a complex value modulation symbol sequence can be obtained; the complex value modulation symbol sequence passes through The scrambling modulation mapping process can obtain a scrambling bit sequence; the scrambling bit sequence can be descrambled to obtain downlink user data.
  • FIG. 6 is a schematic structural diagram of a downlink receiving end of an LTE over VLC according to an embodiment of the present invention.
  • the downlink receiving end may be used to implement the data processing method described in FIG. 5.
  • the downlink receiving end shown in FIG. 6 is used for real
  • the specific process of the data processing method described in FIG. 5 can be as follows:
  • resource mapping processing is performed on the frequency domain data of the OFDM symbol by using a corresponding resource demapping method to obtain a precoding symbol sequence.
  • the downlink transmitting end may receive the indication of the transmitting end before performing the conjugate symmetric expansion on the frequency domain data of the OFDM symbol in step 203.
  • the upper layer first scheduling command for transmitting data in VLC mode In other words, the downlink transmitting end performs the data downlink transmission method of the LTE over VLC described in FIG. 2 after receiving the upper layer first scheduling command.
  • the downlink transmitting end may also receive an upper layer second scheduling command for instructing the transmitting end to transmit data in the RF communication mode; After the foregoing step 201 and step 202 are performed, and the frequency domain data of the OFDM symbol is obtained, the downlink transmitting end may directly perform IFFT and insert CP processing on the frequency domain data of the ODFM symbol to form a second downlink time domain baseband signal (complex sequence). And transmit by radio frequency, that is, the downlink transmitting end uses LTE over RL mode for data transmission.
  • the downlink transmitting end has dual-mode downlink transmission function, that is, the downlink transmitting end can only select the LTE over VLC mode for data downlink transmission, or can only use the LTE over RL mode for data transmission. Under Line transmission; or, the downlink transmitter can simultaneously select the LTE over VLC mode and the LTE over RL mode for downlink data transmission.
  • the downlink transmitting end performs the process of inserting the CP into the real-time sequence of the time domain to form the first downlink time-domain baseband signal, and then performing amplification and pre-distortion processing on the first downlink time-domain baseband signal. Then, the first downlink time domain baseband signal after amplification and predistortion processing is loaded onto the direct current of the LED lighting circuit to form an LED driving electrical signal.
  • a plurality of LEDs are generally formed into a group, which is referred to as an LED lamp group. That is, the LEDs previously mentioned in the embodiments of the present invention may be located in any one of the LED lamp groups consisting of at least two LEDs. Especially in indoors, it is generally necessary to install a plurality of LED light groups for lighting reasons.
  • the layout of an indoor LED light group can be as shown in FIG. Among them, a total of five LED light groups, B, C, D, E, are arranged in the room.
  • the five LED light groups can be respectively located at the four corners and the middle position of the ceiling, and each LED light group is composed of four LEDs. . Since there are a plurality of LEDs emitting light at the same time, visible light-based MIMO transmission can be realized.
  • the visible beam transmission data of each LED in each LED group is also the same, and the visible beam transmission data of each LED group can be the same.
  • the visible light beam of each LED lamp group and its respective LEDs transmits the same data d0, so that the diversity gain can be obtained and the reliability of transmission can be improved.
  • the visible beam transmission data of each LED in each LED group can be different, but the visible beam transmission data of each LED group is the same.
  • the five LEDs transmit data d0, dl, d2, d3 through their respective four LEDs; thus the diversity gain and multiplexing gain can be obtained.
  • the visible beam transmission data of each LED in each LED group can be different, and the visible beam transmission data of each LED group can also be different.
  • the data transmitted by the four LEDs in the LED lamp group A are d0, dl, d2, d3; the data transmitted by the four LEDs in the LED lamp group B are d4, d5, d6, d7;
  • the data transmitted by the four LEDs in group C are d8, d9, dlO, dl l;
  • the data transmitted by the four LEDs in the LED lamp group D are dl2, dl3, dl4, dl5; and the four LEDs in the LED group E
  • the separately transmitted data is dl6, dl7, dl8, dl9; thus, the visible light MIMO transmission can be improved. Transmission capacity.
  • the LTE system uses Single-carrier Frequency-Division Multiple Access (SC) with a lower peak-to-average power ratio (PAPR).
  • SC Single-carrier Frequency-Division Multiple Access
  • PAPR peak-to-average power ratio
  • -FDMA frequency-Division Multiple Access
  • the structure of the uplink transmitter of the existing LTE over RF is shown in Figure 11.
  • the uplink user data is sequentially subjected to scrambling, constellation modulation mapping, MIMO precoding, Discrete Fourier Transform (DFT), SC-FDMA resource mapping, IFFT, and inserted CP processing, and obtains an uplink time domain baseband signal and passes The radio is transmitted.
  • DFT Discrete Fourier Transform
  • IFFT Discrete Fourier Transform
  • IFFT Discrete Fourier Transform
  • FIG. 12 is a schematic flow chart of a data transmission method according to an embodiment of the present invention, which can implement data uplink transmission without being restricted by transmission resources, without electromagnetic interference, and without radiation to the human body.
  • the data transmission method may include the following steps.
  • the transmitting end performs uplink scrambling, constellation modulation mapping, MIMO precoding, and DFT on the uplink user data to obtain a DFT symbol sequence.
  • the constellation modulation mapping that can be used at the transmitting end is BPSK:, QPSK,
  • the transmitting end may be a mobile phone, a notebook, or other smart device, which is not limited in the embodiment of the present invention.
  • the transmitting end performs SC-FDMA resource mapping on the DFT symbol sequence to obtain frequency domain data of the SC-FDMA symbol.
  • the transmitting end may map the DFT symbol sequence to the SC-FDMA time-frequency resource according to resource mapping rules of different physical channels, so that the frequency domain data of the SC-FDMA symbol can be obtained.
  • the transmitting end performs conjugate symmetric expansion and IFFT on the frequency domain data of the SC-FDMA symbol, and obtains a time domain real sequence.
  • the conjugate symmetric expansion of the frequency domain data of the SC-FDMA symbol by the transmitting end refers to adding conjugate symmetric data to the frequency domain data of the SC-FDMA symbol.
  • the time domain is obtained by performing IFFT on the frequency domain data of the SC-FDMA symbol after adding the conjugate symmetric data. Real number sequence.
  • the transmitting end inserts a CP process into the time domain real sequence to form a first uplink time domain baseband signal.
  • the transmitting end loads the first uplink time domain baseband signal into the DC power of the LED lighting circuit to form an LED driving electrical signal.
  • the transmitting end converts the LED driving electrical signal into a visible light beam of the LED for transmission.
  • the transmitting end may also load the first uplink time domain baseband signal (real sequence) onto the direct current of the fluorescent lighting circuit to form a driving electrical signal of the fluorescent lamp; correspondingly, in the above steps In 1206, the transmitting end can convert the driving electric signal of the fluorescent lamp into a visible light beam of the fluorescent lamp for transmission.
  • the transmitting end after obtaining the frequency domain data of the SC-FDMA symbol in the uplink direction, performs conjugate symmetric expansion and IFFT on the frequency domain data of the SC-FDMA symbol, so that a time domain real sequence can be obtained, and Performing an interpolating CP process to form a first uplink time domain baseband signal, the first uplink time domain baseband signal being loaded onto a direct current of the LED lighting circuit to form an LED driving electrical signal, so that the transmitting end can convert the LED driving electrical signal into an LED
  • the visible beam is transmitted. It can be seen that the embodiment of the present invention can implement uplink transmission of data by using visible light of the LED. Since visible light transmission does not require radio frequency transmission and is not regulated by relevant governments and organizations, visible light transmission is not limited by transmission resources. In addition, visible light transmission is not subject to electromagnetic interference and will not affect user reception performance and experience. It does not cause radiation to the human body.
  • FIG. 13 is a schematic structural diagram of an uplink transmitting end of an LTE over VLC according to an embodiment of the present invention.
  • the uplink transmitting end may be used to implement the data transmission method described in FIG. In the uplink transmitting end shown in FIG.
  • the resource mapping mode of the existing LTE over RF is completely reused, and the LTE over VLC with a signal bandwidth of W is used.
  • the effect is LTE over RF with a signal bandwidth of W/2.
  • the specific process of the uplink transmitting end shown in FIG. 13 for implementing the data transmission method described in FIG. 12 may be as follows: 11), the bit sequence of the uplink user data, u (M bu - 1) is performed before the constellation modulation mapping, firstly, the force port 4 is generated, and the force port 4 is generated by the bit order ⁇ ' J (0), (1), ⁇ , ⁇ ( ⁇ _1);
  • the constellation modulation mapping methods that can be used are BPSK, QPSK, 16QAM, 64QAM, and the like. For example, if the QPSK method is used for constellation modulation mapping, bit 00 can be mapped to +/ .
  • V2 V2 bit 01 can be mapped to bit 10 which can be mapped to - and bit 11 can be mapped to
  • ⁇ 6 -1) the generated DFT symbol sequence (ie, a sequence of complex-valued symbols), where M £ USCH , N s is a resource block (RB) occupied in the frequency domain
  • ⁇ " ⁇ " ⁇ ⁇ , ⁇ , RE is the number of resource blocks occupied by uplink transmission of the physical uplink shared channel (PUSCH), M s p .
  • Usch is the number of subcarriers occupied by the uplink uplink of the physical uplink shared channel (PUSCH); ⁇ represents the number of complex-valued modulation symbols.
  • the DFT symbol sequence -l) performing SC-FDMA resource mapping the frequency domain data of the first SC-FDMA symbol can be obtained as a! (0), a, (1), ..., a, (N - 1);
  • the IFFT transform obtains a time domain real number sequence; wherein the new data sequence after the conjugate symmetric extension (i.e., adding conjugate symmetric data) can be subjected to IFFT transformation using the following formula (1). 17), in order to resist inter-symbol interference caused by multipath, insert a time domain real sequence after IFFT into the CP to form a first uplink time domain baseband signal (single real sequence);
  • FIG. 12 illustrates an LTE over VLC data uplink transmission method.
  • the embodiment of the present invention further provides a data processing method for an uplink receiving end (similar to a network side base station), and an implementation process of the data processing method of the uplink receiving end As shown in FIG. 14, the following steps may be included.
  • the receiving end receives the visible beam of the LED and performs photoelectric conversion to obtain a first uplink time domain baseband signal (real sequence).
  • the receiving end performs de-CP, FFT, and de-conjugation on the obtained first uplink time-domain baseband signal. Symmetric processing, obtaining frequency domain data of SC-FDMA symbols;
  • the receiving end performs SC-FDMA resource demapping, Inverse Discrete Fourier Transform (IDFT), MIMO detection and channel equalization, de-constellation modulation mapping, and descrambling on the frequency domain data of the obtained SC-FDMA symbol. Processing, obtaining uplink user data.
  • IDFT Inverse Discrete Fourier Transform
  • MIMO detection and channel equalization de-constellation modulation mapping
  • descrambling on the frequency domain data of the obtained SC-FDMA symbol. Processing, obtaining uplink user data.
  • FIG. 15 is a schematic structural diagram of an uplink receiving end of an LTE over VLC according to an embodiment of the present invention.
  • the uplink receiving end may be used to implement the data processing method described in FIG.
  • the specific process of the uplink receiving end shown in FIG. 15 for implementing the data processing method described in FIG. 14 may be as follows:
  • the SC-FDMA resource demapping process is performed on the frequency domain data of the SC-FDMA symbol by using a corresponding resource demapping method to obtain a DFT symbol sequence.
  • the uplink transmitting end may receive the indication for transmitting before performing the conjugate symmetric expansion on the frequency domain data of the SC-FDMA symbol in step 1203.
  • the upper layer first scheduling command for transmitting data in the VLC mode In other words, the uplink transmitting end performs the description described in FIG. 12 after receiving the upper layer first scheduling command.
  • the uplink transmitting end may also receive an upper layer second scheduling command for instructing the transmitting end to transmit data in the RF communication mode;
  • the frequency domain data of the SC-FDMA symbol can be directly subjected to IFFT and inserted into the CP to form a second uplink time domain baseband signal (plural number
  • the sequence is transmitted by radio frequency, that is, the uplink transmitting end uses the LTE over RL mode for data uplink transmission.
  • the uplink transmitting end has dual-mode uplink transmission function, that is, the uplink transmitting end can only select the LTE over VLC mode for data uplink transmission, or can only use the LTE over RL mode for data transmission.
  • the uplink transmitter may simultaneously select the LTE over VLC mode and the LTE over RL mode for data uplink transmission.
  • the downlink transmitting end may perform downlink data transmission according to the indication of the first layer scheduling command in the LTE over VLC mode or according to the indication of the upper layer second scheduling command, the LTE over RL mode. Description will be made below in conjunction with specific embodiments.
  • FIG. 16 is a schematic structural diagram of a downlink transmitting end according to an embodiment of the present invention.
  • the downlink transmitting end may perform downlink data transmission in the LTE over RL mode or the LTE over VLC mode.
  • the downlink transmitter can be configured with the following modules:
  • the channel selection module is configured to receive an upper layer first scheduling command or an upper layer second scheduling command.
  • Generating a downlink time domain baseband signal module configured to receive an upper layer first scheduling command in the channel selection module, and generate a first downlink time domain baseband signal according to the process shown in FIG. 3, where the first downlink time domain baseband signal a real sequence, and input to the LED driver module; or, the channel selection module receives the second layer scheduling command, and generates a second downlink time domain baseband signal according to the process of FIG. 1, and the second downlink time domain baseband signal It is a complex sequence and is input to the RF transmitter module.
  • the downlink time domain baseband signal module is configured to input the first downlink time domain baseband signal of the real sequence into the LED driving module, and may input some predefined pilot or synchronization signals to the radio frequency transmitting module. , so that users can detect and quickly switch the RF channel.
  • the downlink time domain baseband signal module is generated, and the second downlink time domain baseband signal of the plurality of sequences is input to the radio frequency transmitting module, and the LED driving module can be Input some predefined pilot or synchronization signals for the user to detect and quickly switch the VLC channel.
  • the LED driving module has an input of a direct current of the LED lighting circuit and a first downlink time domain baseband signal (real number sequence) input by the downlink time domain baseband signal module.
  • the LED driving module can amplify and distorte the first downlink time domain baseband signal and then load it into the DC power of the LED lighting circuit to form an LED driving electrical signal and output the LED signal to the LED module.
  • the LED module whose input is the LED driving electrical signal output by the LED driving module, converts the LED driving electrical signal into an LED visible light beam for transmission, that is, the LED not only provides illumination but also serves as a transmitting antenna of the LTE downlink channel.
  • the LED driving module and the LED module cooperate with each other to implement the steps 8) and 9) described in FIG. 3 above.
  • the radio frequency transmitting module is configured to directly transmit the second downlink time domain baseband signal (complex sequence) that generates the downlink time domain baseband signal module to the radio frequency.
  • the downlink transmitting end shown in FIG. 16 can be further refined as shown in FIG. 17.
  • the downlink transmitting end shown in FIG. 17 can be regarded as an optimized combination of the downlink transmitting ends shown in FIG. 1 and FIG. 3. In the downlink transmitter shown in Figure 17, you need to add or modify the following modules:
  • RF/VLC resource mapping module 1.
  • the resource mapping module only maps data to OFDM time-frequency resources in RF mode.
  • the downlink transmitting end may select the LTE over RL mode to perform downlink data transmission according to the first scheduling command of the upper layer, or select the LTE over RL mode to perform downlink data transmission according to the second scheduling command of the upper layer.
  • the B' J RF/VLC resource mapping module maps the MIMO precoded precoding symbol sequence to the OFDM time-frequency resource in the LTE over VLC mode, and performs LTE over VLC The subsequent process in the mode; if the downlink transmitting end receives the upper layer second scheduling command, the RF/VLC resource mapping module maps the MIMO precoded precoding symbol sequence to the OFDM time-frequency resource in the LTE over RF mode, and Perform the subsequent process in LTE over RF mode.
  • this module has an additional transmission mode (RF/VLC) adaptive function.
  • the effective mode of the two modes The number of carriers (ie the number of subcarriers that can be used to load a signal) may be different.
  • the number of effective subcarriers is equal to the number of subcarriers of the OFDM time-frequency resource; and for the LTE over VLC mode, the number of effective subcarriers is equal to half of the number of subcarriers of the OFDM time-frequency resource.
  • the number of effective subcarriers possessed by an OFDM time-frequency resource containing 2048 subcarriers is 1024. This is because the LTE over VLC mode requires signals on the subcarriers to have conjugate symmetry, so half of the subcarriers cannot be used.
  • the method used by the module to map the precoding symbol sequence to the OFDM time-frequency resource of the LTE over VLC mode and the OFDM time-frequency of the LTE over RF mode with the same number of effective subcarriers are mapped to the precoding symbol sequence.
  • the methods used in the resources are consistent. For example, a method of mapping a sequence of precoded symbols to an OFDM time-frequency resource of an LTE over VLC mode (actually having 2048 subcarriers) of 1024 effective subcarriers and mapping a sequence of precoded symbols to 1024 subcarriers
  • the LTE over RF mode uses the same method for OFDM time-frequency resources. Therefore, the resource mapping module (LTE over RF mode) of the legacy LTE system can be reused without redesigning the new resource mapping module.
  • This module is used to perform conjugate symmetric expansion of pre-coded symbol sequences input in parallel.
  • A, A, A, ..., V are N parallel input precoding symbol sequences (frequency from low to high), then the conjugate symmetrically spreads to 2N parallel symbol sequences A. , A, A,..., v,A, ⁇ , — 1 ,...,A*.
  • the first symbol corresponds to a DC subcarrier (DC).
  • the conjugate symmetric expansion module can be combined with the IFFT module behind it to optimize the design, thereby reducing the computational complexity, which is not limited in the embodiment of the present invention.
  • the downlink receiving end may also receive the downlink transmission data in the downlink transmission direction by using the LTE over RL or the LTE over VLC mode.
  • the downlink receiving end receives the downlink transmission data in the same mode as the downlink transmitting end.
  • FIG. 19 is a schematic structural diagram of another downlink receiving end according to an embodiment of the present invention.
  • the downlink receiving end can receive downlink transmission data by using an LTE over RL or an LTE over VLC mode.
  • the downlink connection The receiver can set the following modules:
  • Optical signal focusing module 1.
  • the optical signal focusing module is configured to focus the visible beam of the LED (ie, the optical signal) onto the photodetecting device to increase the intensity of the visible light of the received LED.
  • this module consists of an optical lens.
  • Photoelectric detection signal amplification module
  • the module is mainly used to convert the input visible light into an electrical signal, obtain a first downlink time domain baseband signal (real number sequence), and perform predistortion compensation and signal amplification processing.
  • the module is mainly used to receive the second downlink time domain baseband signal (complex sequence) transmitted by the transmitting end by using the LTE over RL mode.
  • the module is mainly configured to receive LED visible light (ie, downlink transmission data) through the LTE over RL or LTE over VLC mode according to the upper layer scheduling command, and output the signal to the downlink time domain baseband signal processing module.
  • LED visible light ie, downlink transmission data
  • the module is mainly configured to receive LED visible light (ie, downlink transmission data) through the LTE over RL or LTE over VLC mode according to the upper layer scheduling command, and output the signal to the downlink time domain baseband signal processing module.
  • the downlink time domain baseband signal processing module may sequentially perform the second downlink time domain baseband signal (complex sequence) output by the radio frequency receiving module to the CP according to the traditional LTE downlink data processing method. , FFT, resource de-mapping, MIMO detection and channel equalization, de-constellation modulation mapping, and descrambling processing to obtain downlink user data.
  • the downlink time domain baseband signal processing module may sequentially sequence the first downlink time domain baseband signal (real number sequence) output by the photoelectric detection signal amplification module according to the method shown in FIG. De-CP, FFT, de-conjugate symmetry, resource demapping, MIMO detection and channel equalization, de-constellation modulation mapping, and descrambling processing are performed to obtain downlink user data.
  • the module is mainly used to feed back the channel quality of the alternate channel to the upper layer protocol unit, so as to facilitate the system to select the transmission mode. For example, if the downlink transmitting end uses the LTE over RL mode for data downlink transmission, the module detects the VLC signal from the output signal of the photodetection signal amplifying module. The channel quality, and the result is fed back to the upper layer protocol processing unit; if the downlink transmitting end uses the LTE over VLC mode for data downlink transmission, the module detects the RF channel quality from the output signal of the radio frequency receiving module, and feeds the result back to the upper layer. Protocol processing unit.
  • the downlink time domain baseband signal processing module can be further refined, as shown in FIG.
  • the processing process of the downlink time domain baseband signal processing module is the same as that of FIG. 6, that is, the first downlink time domain baseband signal output by the photoelectric detection signal amplification module (real sequence The CP, FFT, de-conjugate symmetry, resource demapping, MIMO detection and channel equalization, de-constellation modulation mapping, and descrambling processing are sequentially removed to obtain corresponding downlink user data.
  • the processing process of the downlink time domain baseband signal processing module is: removing the second downlink time domain baseband signal (complex sequence) output by the radio frequency receiving module, and sequentially removing the CP and the FFT. , resource de-mapping, MIMO detection and channel equalization, de-constellation modulation mapping, and descrambling processing, to obtain corresponding downlink user data. That is, when the channel selection module receives the upper layer second scheduling command, the de-conjugated symmetric module in FIG. 20 does not function, and the signal is transparently transmitted to the OFDM resource demapping module for processing.
  • the transmitter can use the LTE over VLC mode and the LTE over RL mode for downlink data transmission to implement dual-mode downlink transmission.
  • the LTE over VLC mode transmission can be equivalent to a single frequency of carrier aggregation, so as to reuse the existing modules of the traditional LTE system and reduce the impact on the existing LTE standard. Description will be made below in conjunction with specific embodiments.
  • FIG. 21 is a schematic structural diagram of another downlink transmitting end according to an embodiment of the present invention.
  • the downlink transmitting end can simultaneously use the LTE over RL mode and the LTE over VLC mode for downlink data transmission to implement dual-mode downlink transmission.
  • the structure of the downlink transmitting end is similar to that of the downlink transmitting end shown in FIG. 16, and only the channel selecting module is omitted.
  • the downlink time domain baseband signal module is generated, and the second downlink time domain baseband signal of the complex sequence and the first sequence of the real sequence are generated according to the processes shown in FIG. 1 and FIG.
  • the time domain baseband signal is transmitted; and the second downlink time domain baseband signal of the complex sequence is directly transmitted through the radio frequency, and the first downlink time domain baseband signal of the real sequence is transmitted through the visible light of the LED.
  • the downlink transmitting end may separately generate the second downlink user data of the same downlink.
  • the downlink time domain baseband signal (complex sequence) and the first downlink time domain baseband signal (real sequence) transmit the second downlink time domain baseband signal (complex sequence) directly through the radio frequency, and the first downlink time domain baseband The signal (real sequence) is transmitted through the visible light of the LED.
  • the downlink transmitting end when the downlink transmitting end uses the LTE over RL mode and the LTE over VLC mode for downlink data transmission, the downlink transmitting end may use part of the multiple downlink user data.
  • the downlink user data generates a second downlink time domain baseband signal (complex sequence), and generates the first downlink time domain baseband signal (real sequence) and the second downlink time domain baseband signal (complex sequence)
  • the first downlink time domain baseband signal (real number sequence) is transmitted through the LED visible light by transmitting directly through the radio frequency.
  • FIG. 22 is a schematic structural diagram of another downlink receiving end according to an embodiment of the present invention.
  • the downlink receiving end can receive downlink transmission data through the LTE over RL and the LTE over VLC mode at the same time.
  • the function of the photodetection signal amplifying module is the same as that of the photodetecting signal amplifying module shown in FIG. 19; the function of the radio frequency transmitting module and the function of the radio frequency transmitting module shown in FIG.
  • the downlink time domain baseband signal processing module in the downlink receiving end shown in FIG. 22 can be refined into the first downlink time domain baseband signal (real number) outputted by the photoelectric detection signal amplification module as shown in FIG.
  • Sequence sequentially removing CP, FFT, de-conjugation symmetry, resource demapping, MIMO detection and channel equalization, de-constellation modulation mapping, and descrambling processing to obtain corresponding downlink user data; and, second output to the radio frequency transmitting module
  • the downlink time domain baseband signal sequentially removes CP, FFT, resource demapping, MIMO detection and channel equalization, de-constellation modulation mapping, and descrambling processing to obtain corresponding downlink user data.
  • FIG. 24 is a schematic structural diagram of an uplink transmitting end according to an embodiment of the present invention.
  • the uplink transmitting end can use the LTE over RL mode or the LTE over VLC mode for data uplink transmission.
  • the structure of the uplink transmitting end shown in FIG. 24 is similar to the structure of the downlink transmitting end shown in FIG. 16. The difference is that in the uplink transmitting end shown in FIG.
  • the generating the uplink time domain baseband signal module can be refined into the FIG. Show.
  • the uplink time domain baseband signal module may generate uplink user data for scrambling, constellation modulation mapping, MIMO precoding, DFT, and SC-FDMA resources, respectively.
  • the mapping, the conjugate symmetric extension, the IFFT, and the insertion of the CP form a first uplink time domain baseband signal (a real sequence) and are transmitted through the visible light of the LED.
  • the generating the uplink time domain baseband signal module may perform uplink user data scrambling, constellation modulation mapping, MIMO precoding, DFT, SC-FDMA resource mapping, IFFT, and insertion into the CP, respectively. Forming a second uplink time domain baseband signal (complex sequence) and transmitting by radio frequency. That is, when the channel selection module receives the upper layer second scheduling command, generating the symmetric conjugate expansion module in the downlink time domain baseband signal module does not work.
  • the LED driving module and the LED lamp cooperate to implement the above steps 18) and 19).
  • FIG. 26 is a schematic structural diagram of another uplink receiving end according to an embodiment of the present invention.
  • the structure of the uplink receiving end shown in FIG. 26 is similar to the structure of the downlink receiving end shown in FIG.
  • the uplink time domain baseband signal processing module may be sequentially subjected to de-CP, FFT, de-conjugate symmetry, SC-FDMA resource mapping, IDFT, MIMO detection, channel equalization, and constellation modulation mapping. And the scrambling process is performed to obtain the uplink user data.
  • the uplink time domain baseband signal processing module may output the second uplink time domain baseband signal (the complex sequence) of the radio frequency transmitting module. ) De-CP, FFT, SC-FDMA resource mapping, IDFT, MIMO detection, channel equalization, solution Constellation modulation mapping and scrambling processing to obtain uplink user data.
  • the uplink transmitting end can also use the LTE over VLC mode and the LTE over RL mode for uplink data transmission to implement dual-mode uplink transmission.
  • the structure of the uplink transmitting end that can simultaneously use the LTE over VLC mode and the LTE over RL mode for data uplink transmission is similar to the structure of the downlink transmitting end shown in FIG. 21, as shown in FIG. The difference is that, in the uplink transmitting end shown in FIG. 27, the uplink time domain baseband signal module is generated to perform uplink scrambling, constellation modulation mapping, MIMO precoding, DFT, SC-FDMA resource mapping, and conjugate.
  • the FDMA resource map, the IFFT, and the inserted CP form a second uplink time domain baseband signal (complex sequence) and are transmitted by transmission.
  • the uplink transmitting end when the uplink transmitting end uses the LTE over RL mode and the LTE over VLC mode for data uplink transmission, the uplink transmitting end may generate the second uplink user data separately.
  • the uplink time domain baseband signal (complex sequence) and the first uplink time domain baseband signal (real sequence) transmit the second uplink time domain baseband signal (complex sequence) directly through the radio frequency, and the first uplink time domain baseband signal ( The real sequence is transmitted by visible light of the LED.
  • the uplink receiving end can also receive the downlink transmission data through the LTE over RL and the LTE over VLC mode in the uplink transmission direction, as shown in FIG. 28 .
  • the structure of the uplink receiving end shown in FIG. 28 is similar to the structure of the downlink receiving end shown in FIG. 22, except that in the uplink receiving end shown in FIG. 28, the uplink time domain baseband signal processing module can detect the photodetection signal.
  • the first uplink time domain baseband signal (real number sequence) output by the amplification module sequentially performs de-CP, FFT, de-conjugate symmetry, SC-FDMA resource mapping, IDFT, MIMO detection and channel equalization, de-constellation modulation mapping, and scrambling processing, Obtaining uplink user data; and sequentially performing a second uplink time domain baseband signal (complex sequence) output by the radio frequency transmitting module to perform CP, FFT, SC-FDMA resource mapping, IDFT, MIMO detection, channel equalization, and constellation modulation mapping, and adding Interference processing, obtaining uplink user data; achieving dual-mode uplink reception.
  • the embodiment of the present invention further describes the LED driving module described above.
  • This hair An LED driving module provided by the embodiment has a structure as shown in FIG. Among them, in LTE over RL mode, the vector gain adjuster (DPD) in the LED driver module is mainly used to correct the nonlinear gain of the radio frequency power amplifier. In the LTE over VLC mode, the LED driver module needs to convert the electrical signal into an optical signal, and usually the conversion is not completely linear. Therefore, it is necessary to add a DPD in front of the electro-optical conversion module to increase the intensity of the optical signal.
  • the DPD can multiplex the DPD of the radio frequency, and only needs to be modified as follows:
  • the adaptive adjustment module only needs to adjust the amplitude and does not need to adjust the phase.
  • the lookup table only needs to store the adjustment information of the amplitude, and does not need to store the phase adjustment information.
  • an optical signal receiver (such as the aforementioned optical signal focusing module) can be installed at the transmitting end, and the optical signal received by the receiver is photoelectrically converted and then input into the DPD for generation. Signal amplitude adjustment information.
  • the transmitting end after obtaining the frequency domain data of the OFDM symbol in the downlink direction, the transmitting end performs conjugate symmetric extension and IFFT on the frequency domain data of the OFDM symbol, so that a time domain real sequence can be obtained, and the CP process is formed.
  • a first downlink time domain baseband signal the first downlink time domain baseband signal is loaded onto the direct current of the LED lighting circuit to form an LED driving electrical signal, so that the transmitting end can convert the LED driving electrical signal into a visible light beam of the LED Transfer.
  • the transmitting end after obtaining the frequency domain data of the SC-FDMA symbol in the uplink direction, performs conjugate symmetric expansion and IFFT on the frequency domain data of the SC-FDMA symbol, so that the time domain real sequence can be obtained. And performing inserting CP processing to form a first uplink time domain baseband signal, the first uplink time domain baseband signal being loaded onto the direct current of the LED lighting circuit to form an LED driving electrical signal, so that the transmitting end can convert the LED driving electrical signal
  • the visible light beam of the LED is transmitted. It can be seen that the embodiment of the present invention can realize the transmission of data by the visible light of the LED.
  • visible light transmission does not require radio frequency transmission certificate and will not be regulated by relevant governments and organizations, visible light transmission will not be restricted by transmission resources. In addition, visible light transmission will not be affected by electromagnetic interference and will not affect user's receiving performance and Experience does not cause radiation to the human body.
  • FIG. 30 is a schematic structural diagram of a transmitting end according to an embodiment of the present invention.
  • the transmitting end can be free from transmission resource limitation, no electromagnetic interference, and no radiation to the human body.
  • the data is now downlink.
  • the transmitting end may include:
  • the first processing unit 3001 is configured to perform downlink scrambling, constellation modulation mapping, and MIMO precoding processing on the downlink user data to obtain a precoded symbol sequence.
  • a second processing unit 3002 configured to perform resource mapping on the pre-coded symbol sequence obtained by the first processing unit 3001, to obtain frequency domain data of the OFDM symbol;
  • the third processing unit 3003 is configured to perform conjugate symmetric expansion on the frequency domain data of the OFDM symbol obtained by the second processing unit 3002.
  • the fourth processing unit 3004 is configured to perform IFFT on the frequency domain data after the conjugate symmetric expansion of the third processing unit 3003, to obtain a time domain real sequence;
  • the fifth processing unit 3005 is configured to perform a CP process on the time domain real sequence obtained by the fourth processing unit 3004 to form a first downlink time domain baseband signal;
  • a sixth processing unit 3006 configured to load the first downlink time domain baseband signal onto the direct current of the LED lighting circuit to form an LED driving electrical signal
  • the seventh processing unit 3007 is configured to convert the LED driving electrical signal into a visible light beam of the LED for transmission.
  • the transmitting end may further include:
  • the eighth processing unit 3008 is configured to receive, before the third processing unit 3003 performs conjugate symmetric expansion on the frequency domain data of the OFDM symbol obtained by the second processing unit 3002, to receive, by the transmitting end, the data transmitted by using the visible light communication mode. An upper layer scheduling command is notified, and the third processing unit 3003 is notified to perform conjugate symmetric expansion on the frequency domain data of the OFDM symbol obtained by the second processing unit.
  • the eighth processing unit 3008 is further configured to notify the fourth processing unit 3004 to the second processing unit when receiving the upper layer second scheduling command for instructing the transmitting end to transmit data in the radio frequency communication mode.
  • 3002 obtained frequency domain data of the OFDM symbol is subjected to IFFT;
  • the fourth processing unit 3004 is further configured to perform IFFT on the frequency domain data of the OFDM symbol obtained by the second processing unit 3002 according to the notification of the eighth processing unit 3008, obtain a time domain complex sequence, and output the sequence to the fifth processing unit 3005. ;
  • the fifth processing unit 3005 is further configured to perform a CP insertion process on the time domain complex sequence obtained by the fourth processing unit 3004 to form a second downlink time domain baseband signal and transmit the data by using a radio frequency.
  • the sixth processing unit 3006 is further configured to: amplify and pre-distort the first downlink time domain baseband signal before loading the first downlink time domain baseband signal into the DC power of the LED lighting circuit. deal with.
  • the LED is located in any one of the LED groups consisting of at least two LEDs, wherein the visible beam transmission data of each LED in each LED group is the same, and the visible beam of each LED group The same data is transmitted;
  • the visible beam transmission data of each LED in each LED group is different, and the visible beam transmission data of each LED group is the same;
  • the visible beam transmission data for each LED in each LED group is different and the visible beam transmission data for each LED group is different.
  • FIG. 31 is a schematic structural diagram of a transmitting end according to an embodiment of the present invention.
  • the transmitting end can realize data uplink transmission without being restricted by transmission resources, without electromagnetic interference, and without radiation to the human body.
  • the transmitting end may include:
  • the first processing module 3101 is configured to perform uplink scrambling, constellation modulation mapping, MIMO precoding, and DFT on the uplink user data to obtain a DFT symbol sequence.
  • the second processing module 3102 is configured to perform SC-FDMA resource mapping on the DFT symbol sequence obtained by the first processing module 3101, to obtain frequency domain data of the SC-FDMA symbol;
  • the third processing module 3103 is configured to perform conjugate symmetric expansion on the frequency domain data of the SC-FDMA symbol obtained by the second processing module 3102.
  • the fourth processing module 3104 is configured to perform IFFT on the frequency domain data after the conjugate symmetric expansion of the third processing module 3103, to obtain a time domain real sequence;
  • the fifth processing module 3105 is configured to perform a CP process on the time domain real sequence obtained by the fourth processing module 3104, to form a first uplink time domain baseband signal;
  • a sixth processing module 3106 configured to load the first uplink time domain baseband signal onto the direct current of the LED lighting circuit to form an LED driving electrical signal
  • the seventh processing module 3107 is configured to convert the LED driving electrical signal into a visible light beam of the LED and transmit the same.
  • the transmitting end shown in FIG. 31 may further include:
  • the eighth processing module 3108 is configured to: before the third processing module 3101 performs conjugate symmetric expansion on the frequency domain data of the SC-FDMA symbol obtained by the second processing module 3102, receive the data for indicating that the transmitting end transmits the data in the visible light communication mode.
  • the eighth processing unit 3108 is further configured to notify the fourth processing module 3104 to the second processing module when receiving the upper layer second scheduling command for instructing the transmitting end to transmit data in the radio frequency communication mode.
  • the fourth processing module 3104 is further configured to perform IFFT on the frequency domain data of the SC-FDMA symbol obtained by the second processing module 3102 according to the notification of the eighth processing module 3108, obtain a time domain complex sequence, and output the fifth sequence to the fifth processing.
  • the fifth processing module 3105 is further configured to perform a CP insertion process on the time domain complex sequence obtained by the fourth processing module 3104 to form a second uplink time domain baseband signal and transmit the data through the radio frequency.
  • FIG. 32 is a schematic structural diagram of a data transmission system according to an embodiment of the present invention.
  • the data transmission system can realize data downlink transmission without being restricted by transmission resources, without electromagnetic interference, and without radiation to the human body.
  • the system can include:
  • a transmitting end 3201 configured to sequentially perform downlink scrambling, constellation modulation mapping, and MIMO precoding processing to obtain a precoding symbol sequence; perform resource mapping on the precoding symbol sequence to obtain frequency domain data of the OFDM symbol;
  • the frequency domain data of the OFDM symbol is subjected to conjugate symmetric extension and IFFT to obtain a time domain real number sequence;
  • the time domain real sequence is inserted into the CP process to form a downlink time domain baseband signal; and the first downlink time domain baseband signal is loaded to
  • an LED driving electrical signal is formed; and the LED driving electrical signal is converted into a visible light beam of the LED for transmission.
  • the receiving end 3202 is configured to receive a visible light beam of the LED and perform photoelectric conversion to obtain a first downlink time domain baseband signal; perform de-CP, FFT, and de-conjugate symmetry processing on the obtained downlink time-domain baseband signal to obtain an OFDM symbol.
  • Frequency domain data performing resource de-mapping processing on the obtained frequency domain data of the OFDM symbol to obtain a pre-coded symbol sequence; and sequentially performing MIMO detection, channel equalization, de-constellation modulation mapping, and descrambling processing on the obtained pre-coded symbol sequence, Get downlink user data.
  • the transmitting end 3201 is further configured to perform conjugate symmetry on carrier data. Before the extension, an upper layer first scheduling command for instructing the transmitting end 3201 to transmit data in the visible light communication mode is received.
  • the transmitting end 3201 is further configured to: after receiving the upper layer second scheduling command for instructing the transmitting end 3201 to transmit data in the radio frequency communication mode, after obtaining frequency domain data of the OFDM symbol, to the OFDM
  • the frequency domain data of the symbol is subjected to IFFT and inserted into the CP to form a second downlink time domain baseband signal and transmitted through the radio frequency;
  • the receiving end 3202 is further configured to receive a second downlink time domain baseband signal that is transmitted by the transmitting end 3201 by using a radio frequency, and perform de-CP, FFT, resource demapping, MIMO detection, channel equalization, de-constellation modulation mapping, and solution in sequence. Disturbance processing, obtaining downlink user data.
  • FIG. 33 is a schematic structural diagram of a data transmission system according to an embodiment of the present invention.
  • the data transmission system can realize data uplink transmission without being restricted by transmission resources, without electromagnetic interference, and without radiation to the human body.
  • the system can include:
  • the transmitting end 3301 is configured to perform uplink DPS symbol sequence scrambling, constellation modulation mapping, MIMO precoding, and DFT, and obtain a DFT symbol sequence by performing SC-FDMA resource mapping to obtain frequency domain data of the SC-FDMA symbol.
  • the domain baseband signal is applied to the direct current of the LED lighting circuit to form an LED driving electrical signal; and the LED driving electrical signal is converted into a visible light beam of the LED for transmission.
  • the receiving end 3302 is configured to receive a visible light beam of the LED and perform photoelectric conversion to obtain a first uplink time domain baseband signal; perform de-CP, FFT, and de-conjugate symmetry processing on the obtained first uplink time-domain baseband signal to obtain an SC- Frequency domain data of FDMA symbols; SC-FDMA resource demapping, IDFT, MIMO detection and channel equalization, de-constellation modulation mapping, and descrambling processing are sequentially performed on the obtained carrier data to obtain uplink user data.
  • the transmitting end 3301 is further configured to: before the conjugate symmetric expansion of the frequency domain data of the SC-FDMA symbol, receive an upper layer first scheduling for instructing the transmitting end 3301 to transmit data in the visible light communication mode. command.
  • the transmitting end 3301 is further configured to receive the indication end when receiving When the upper layer second scheduling command for transmitting data in the radio frequency communication mode is used, after the frequency domain data of the SC-FDMA symbol is obtained, the frequency domain data of the SC-FDMA symbol is IFFT and the CP is inserted to form a second uplink time domain.
  • the receiving end 3302 is further configured to receive a second downlink time domain baseband signal that is transmitted by the transmitting end 3301 by using a radio frequency, and perform de-CP, FFT, SC-FDMA resource demapping, IDFT, MIMO detection, and channel equalization, respectively. Constellation modulation mapping and descrambling processing to obtain uplink user data.
  • the program may be stored in a computer readable storage medium, and the storage medium may include: Flash disk, read-only memory (ROM), random access memory (RAM), disk or optical disk.

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Abstract

本发明实施例公开了一种数据传输方法及相关设备、系统。其中,一种数据传输方法包括:发射端将下行用户数据依次进行加扰、星座调制映射以及多输入多输出预编码处理,获得预编码符号序列;将该预编码符号序列进时频资源映射,获得OFMD符号的频域数据;对该OFMD符号的频域数据进行共轭对称扩展以及IFFT,获得时域实数序列;对该时域实数序列进行插入CP处理,形成第一下行时域基带信号;将该第一下行时域基带信号加载到LED照明电路的直流电上,形成LED驱动电信号;以及,将该LED驱动电信号转换成上述LED的可见光束进行传输。本发明实施例可以能够在不受传输资源限制、无电磁干扰以及对人体无辐射的情况下实现数据传输。

Description

一种数据传输方法及相关设备、 系统
本申请要求于 2011 年 3 月 15 日提交中国专利局、 申请号为 201110062155.4, 发明名称为 "一种数据传输方法及相关设备、 系统" 的中国 专利申请优先权, 上述专利的全部内容通过引用结合在本申请中。 技术领域
本发明涉及数据传输领域,具体涉及一种数据传输方法及相关设备、系统。 背景技术
在传统的射频通信系统中, 例如在长期演进( Long Term Evolution, LTE ) 系 统中, 数据传输是基于射频通信来实现的, 即 LTE over RF。 其中, 射频通信 不仅需要占用一定数量的无线频谱, 导致无线频谱资源愈来愈紧张, 而且射频 通信很容易会被电磁干扰,特别是小区边缘用户受到的干扰最为严重; 另一方 面, 射频通信还会对人体会造成一定的辐射。
因此,如何研究一种新的数据传输方式以解决传统的射频通信中存在的问 题, 是人们亟需解决的。 发明内容 针对上述问题, 本发明实施例提供一种数据传输方法及相关设备、 系统, 能够在不受传输资源限制、无电磁干扰以及对人体无辐射的情况下实现数据传 输。 其中, 一种数据传输方法, 包括: 发射端将下行用户数据依次进行加扰、 星座调制映射以及多输入多输出 预编码处理, 获得预编码符号序列; 所述发射端将所述预编码符号序列进行时频资源映射, 获得正交频分复 用符号的频域数据; 所述发射端对所述正交频分复用符号的频域数据进行共轭对称扩展以及 快速傅立叶逆变换, 获得时域实数序列; 所述发射端对所述时域实数序列进行插入循环前缀处理, 形成第一下行 时域基带信号; 所述发射端将所述第一下行时域基带信号加载到发光二极管照明电路的 直流电上, 形成发光二极管驱动电信号; 所述发射端将所述发光二极管驱动电信号转换成所述发光二极管的可见 光束进行传输。 其中, 另一种数据传输方法, 包括: 发射端将上行用户数据依次进行加扰、 星座调制映射、 多输入多输出预 编码以及离散傅立叶变换处理, 获得离散傅立叶变换符号序列; 所述发射端将所述离散傅立叶变换符号序列进行单载波频分复用资源映 射, 获得单载波频分复用符号的频域数据; 所述发射端对所述单载波频分复用符号的频域数据进行共轭对称扩展以 及快速傅立叶逆变换, 获得时域实数序列; 所述发射端对所述时域实数序列进行插入循环前缀处理, 形成第一上行 时域基带信号; 所述发射端将所述第一上行时域基带信号加载到发光二极管照明电路的 直流电上, 形成发光二极管驱动电信号; 所述发射端将所述发光二极管驱动电信号转换成所述发光二极管的可见 光束进行传输。 其中, 一种发射端, 包括: 第一处理单元, 用于将下行用户数据依次进行加扰、 星座调制映射以及 多输入多输出预编码处理, 获得预编码符号序列; 第二处理单元, 用于将所述第一处理单元获得的所述预编码符号序列进 行时频资源映射, 获得正交频分复用符号的频域数据; 第三处理单元, 用于对所述第二处理单元获得的所述正交频分复用符号 的频域数据进行共轭对称扩展; 第四处理单元, 用于对所述第三处理单元进行共轭对称扩展后的频域数 据进行快速傅立叶逆变换, 获得时域实数序列; 第五处理单元, 用于对所述第四处理单元获得的所述时域实数序列进行 插入循环前缀处理, 形成第一下行时域基带信号; 第六处理单元, 用于将所述第一下行时域基带信号加载到发光二极管照 明电路的直流电上, 形成发光二极管驱动电信号; 第七处理单元, 用于将所述发光二极管驱动电信号转换成所述发光二极 管的可见光束进行传输。 其中, 另一种发射端, 包括: 第一处理模块, 用于将上行用户数据依次进行加扰、 星座调制映射、 多 输入多输出预编码以及离散傅立叶变换处理, 获得离散傅立叶变换符号序列; 第二处理模块, 用于将所述第一处理模块获得的所述离散傅立叶变换符 号序列进行单载波频分复用资源映射, 获得单载波频分复用符号的频域数据; 第三处理模块, 用于将所述第二处理模块获得的所述单载波频分复用符 号的频域数据进行共轭对称扩展; 第四处理模块, 用于对所述第三处理模块进行共轭对称扩展后的频域数 据进行快速傅立叶逆变换, 获得时域实数序列; 第五处理模块, 用于对第四处理模块获得的所述时域实数序列进行插入 循环前缀处理, 形成第一上行时域基带信号; 第六处理模块, 用于将所述第一上行时域基带信号加载到发光二极管照 明电路的直流电上, 形成发光二极管驱动电信号; 第七处理模块, 用于将所述发光二极管驱动电信号转换成所述发光二极 管的可见光束进行传输。 其中, 一种数据传输系统, 包括: 发射端, 用于将下行用户数据依次进行加扰、 星座调制映射以及多输入 多输出预编码处理, 获得预编码符号序列; 将所述预编码符号序列进行时频资 源映射, 获得正交频分复用符号的频域数据; 对所述正交频分复用符号的频域 数据进行共轭对称扩展以及快速傅立叶逆变换,获得时域实数序列; 对所述时 域实数序列进行插入循环前缀处理, 形成第一下行时域基带信号; 将所述第一 下行时域基带信号加载到发光二极管照明电路的直流电上,形成发光二极管驱 动电信号;以及将所述发光二极管驱动电信号转换成所述发光二极管的可见光 束进行传输; 接收端, 用于接收所述发光二极管的可见光束并进行光电转换, 获得第 一下行时域基带信号; 对获得的第一下行时域基带信号进行去循环前缀、快速 傅立叶变换以及去共轭对称处理, 获得正交频分复用符号的频域数据; 对获得 的正交频分复用符号的频域数据进行资源去映射处理, 获得预编码符号序列; 以及对获得的预编码符号序列依次进行多输入多输出检测和信道均衡、解星座 调制映射以及解扰处理, 获得下行用户数据。 其中, 另一种数据传输系统, 包括: 发射端, 用于将上行用户数据依次进行加扰、 星座调制映射、 多输入多 输出预编码以及离散傅立叶变换处理, 获得离散傅立叶变换符号序列; 将所述 离散傅立叶变换符号序列进行单载波频分复用资源映射,获得单载波频分复用 符号的频域数据;对所述单载波频分复用符号的频域数据进行共轭对称扩展以 及快速傅立叶逆变换, 获得时域实数序列; 对所述时域实数序列进行插入循环 前缀处理, 形成第一上行时域基带信号; 将所述第一上行时域基带信号加载到 发光二极管照明电路的直流电上, 形成发光二极管驱动电信号; 以及将所述发 光二极管驱动电信号转换成所述发光二极管的可见光束进行传输; 接收端, 用于接收所述发光二极管的可见光束并进行光电转换, 获得第 一上行时域基带信号; 对获得的第一上行时域基带信号进行去循环前缀、快速 傅立叶变换以及去共轭对称处理, 获得单载波频分复用符号的频域数据; 对获 得的单载波频分复用符号的频域数据依次进行单载波频分复用资源去映射、离 散傅立叶逆变换、 多输入多输出检测和信道均衡、解星座调制映射以及解扰处 理, 获得上行用户数据。
本发明实施例中,发射端在下行方向上获得正交频分复用符号的频域数据 之后 ,对该正交频分复用符号的频域数据进行共轭对称扩展以及快速傅立叶逆 变换,从而可以获得时域实数序列, 并进行插入循环前缀处理形成第一下行时 域基带信号,该第一下行时域基带信号被加载到发光二极管照明电路的直流电 上后形成发光二极管驱动电信号,从而发射端可以将该发光二极管驱动电信号 转换成发光二极管的可见光束进行传输。本发明实施例中,发射端在上行方向 上获得单载波频分复用符号的频域数据之后,对该单载波频分复用符号的频域 数据进行共轭对称扩展以及快速傅立叶逆变换, 从而可以获得时域实数序列, 并进行插入循环前缀处理形成第一上行时域基带信号,该第一上行时域基带信 号被加载到发光二极管照明电路的直流电上后形成发光二极管驱动电信号,从 而发射端可以将该发光二极管驱动电信号转换成发光二极管的可见光束进行 传输。 可见, 本发明实施例可以通过发光二极管的可见光来实现数据的传输。 由于可见光传输无需无线电频傳证, 不会受到相关政府、 组织的监管, 所以可 见光传输不会受传输资源的限制; 另外, 可见光传输不会受电磁干扰, 不会影 响用户的接收性能和体验, 也不会对人体造成辐射。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施 例中所需要使用的附图作简单地介绍,显而易见地, 下面描述中的附图仅仅是 本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动性 的前提下, 还可以根据这些附图获得其他的附图。
图 1为现有 LTE over RF的下行发射端的结构示意图; 图 2为本发明实施例提供的一种数据传输方法的流程示意图; 图 3为本发明实施例提供的一种用于实现图 2所描述的数据传输方法的下 行发射端的结构示意图;
图 4为本发明实施例提供的一种 OFDM符号的频域数据共轭对称的示意 图;
图 5 为本发明实施例提供的一种下行接收端的数据处理方法的流程示意 图;
图 6为本发明实施例提供的一种 LTE over VLC的下行接收端的结构示意 图;
图 7为本发明实施例提供的一种室内 LED灯组的布局示意图;
图 8为图 7所示 LED灯组的一种可见光束传输数据的示意图;
图 9为图 7所示 LED灯组的另一种可见光束传输数据的示意图; 图 10为图 7所示 LED灯组的又一种可见光束传输数据的示意图; 图 11为现有的一种 LTE over RF的上行发射端的结构示意图;
图 12为本发明实施例提供的另一种数据传输方法的流程示意图; 图 13为本发明实施例提供的一种用于实现图 12所描述的数据传输方法的 上行发射端的结构示意图;
图 14为本发明实施例提供的一种上行接收端的数据处理方法的流程示意 图;
图 15为本发明实施例提供的一种 LTE over VLC的上行接收端的结构示意 图;
图 16为本发明实施例提供的另一种下行发射端的结构示意图;
图 17为图 16所示的下行发射端的细化图;
图 18为预编码符号序列进行共轭对称扩展的示意图;
图 19为本发明实施例提供的另一种下行接收端的结构示意图;
图 20为图 19所示的下行接收端中的下行时域基带信号处理模块的示意 图; 图 21为本发明实施例提供的另一种下行发射端的结构示意图; 图 22为本发明实施例提供的另一种下行接收端的结构示意图;
图 23为图 22所示的下行接收端中的下行时域基带信号处理模块的细化 图;
图 24为本发明实施例提供的一种上行发射端的结构示意图;
图 25为图 24所示的上行发射端中的生成上行时域基带信号模块的细化 图;
图 26为本发明实施例提供的另一种上行接收端的结构示意图;
图 27为本发明实施例提供的另一种上行发射端的结构示意图;
图 28为本发明实施例提供的另一种上行接收端的结构示意图;
图 29为本发明实施例提供的一种 LED驱动模块的结构示意图;
图 30本发明实施例提供的一种发射端的结构示意图;
图 31本发明实施例提供的另一种发射端的结构示意图;
图 32本发明实施例提供的一种数据传输系统的结构示意图;
图 33本发明实施例提供的一种数据传输系统的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清 楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是 全部的实施例。基于本发明中的实施例, 本领域普通技术人员在没有做出创造 性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范围。
在介绍本发明实施例之前,先对本发明实施例中涉及到的相关概念进行说 明。
发光二极管 (Light Emitting Diode, LED )是一种能够直接将电能转化为 可见光的固态的半导体器件。 与传统的照明光源相比, LED 不仅功耗低、 使 用寿命长、尺寸小、绿色环保, 而且还具有调制性能好、响应灵敏度高等优点。 利用 LED 的上述特性,在 LED用作照明的同时,还可以将信号转换成 LED 可 见光束进行传输,从而实现一种新兴的光无线通信技术,即可见光通信( Visible Light Communication, VLC )技术。 其中, VLC技术的本质是利用 LED (或 荧光灯等)发出的高速明暗闪烁信号来传输信息的。 与传统的射频 (Radio Frequency, RF )通信相比, VLC技术具有无电磁干扰、 对人体无辐射以及可 见光资源丰富等优点, 因此, VLC技术具有极大的发展前景。
本发明实施例提供了一种数据传输方法及相关设备、 系统, 能够在不受传 输资源限制、 无电磁干扰以及对人体无辐射的情况下实现数据传输。 其中, 本 发明实施例提供的数据传输方法及相关设备、 系统可以应用在包括但不限于 LTE系统中, 本发明实施例后续将以 LET系统为例进行详细说明。 其中, 传 统的 LTE系统是基于射频通信来实现数据传输的,即 LTE over RF。现有的 LTE over RF的下行发射端的结构如图 1所示。 其中, 下行用户数据 ( 1 ... ... k )依 次经过加扰、 星座调制映射、 多输入多输出 ( Multiple-Input Multiple-Output, MIMO )预编码、 时频资源映射、 快速傅立叶逆变换 ( Inverse Fast Fourier Transform, IFFT ) 以及插入循环前缀( Cyclic Prefix, CP )处理后, 获得下行 时域基带信号并通过射频进行传输。 在图 1所示的下行发射端中, 经过 IFFT 输出的信号为复数序列, 由于可见光接收为非相干接收, 因此通常釆用强度调 制(Intensity Modulation, IM ), 这就要求输入的信号为实数序列, 所以如图 1 所示的下行发射端输出的下行时域基带信号(复数序列 )并不能直接驱动 LED 可见光通信。
请参阅图 2,图 2为本发明实施例提供的一种数据传输方法的流程示意图, 该方法能够在不受传输资源限制、无电磁干扰以及对人体无辐射的情况下实现 数据下行传输。 其中, 图 2所描述的方法是以 LET系统为应用场景的, 本领 域技术人员可以理解,本发明实施例提供的数据传输方法也可以应用于其他通 信系统, 实现可见光通信, 本发明实施例不作限定。 如图 2所示, 该数据传输 方法可以包括如下步骤。
201、 发射端将下行用户数据依次进行加扰、 星座调制映射以及 MIMO预 编码处理, 获得预编码符号序列。
举例来说,发射端可以釆用的星座调制映射的方式有以下几种: 如二进制 相移键控 ( Binary Phase Shift Keying, BPSK ),正交相移键控 ( Quadrature Phase Shift Keying, QPSK ), 16正交幅度调制( 16 Quadrature Amplitude Modulation, 16QAM ), 64正交幅度调制 ( 64 Quadrature Amplitude Modulation, 64QAM ) 等等。 复用 (Orthogonal Frequency Division Multiplexing, OFDM )符号的频 i或数据。
其中,发射端可以根据不同物理信道的资源映射规则,将上述的预编码符 号序列映射到时频资源上, 从而可以得到 OFDM符号的频域数据。
203、 发射端对上述的 OFDM符号的频域数据进行共轭对称扩展以及 IFFT, 获得时域实数序列。
本发明实施例中, 发射端对上述的 OFDM符号的频域数据进行共轭对称 扩展是指对上述的 OFDM符号的频域数据添加共轭对称数据。 其中, 对添加 共轭对称数据之后的 OFDM符号的频域数据进行 IFFT可以获得时域实数序 列。
204、 发射端对上述的时域实数序列进行插入 CP处理, 形成第一下行时 域基带信号。
本发明实施例中, 发射端对上述的时域实数序列插入 CP可以 氏抗由多径 所造成的符号间干扰。 由于上述步骤 203中发射端所获得的是时域实数序列, 所以步骤 204中发射端所形成的第一下行时域基带信号也是实数序列。
205、发射端将上述的第一下行时域基带信号加载到 LED照明电路的直流 电上, 形成 LED驱动电信号。
本发明实施例中, 作为实数序列的第一下行时域基带信道加载到 LED照 明电路的直流电之后, 可以形成 LED驱动电信号, 该 LED驱动电信号可以驱 动 LED发出可见光。
206、发射端将上述的 LED驱动电信号转换成 LED的可见光束进行传输。 可选地,在上述步骤 205中,发射端也可以将上述的第一下行时域基带信 号(实数序列)加载到荧光灯照明电路的直流电上,形成荧光灯的驱动电信号; 相应地,在上述步骤 206中,发射端可以将荧光灯的驱动电信号转换成荧光灯 的可见光束进行传输。 本发明实施例中,发射端在下行方向上获得正交频分复用符号的频域数据 之后, 对该正交频分复用符号的频域数据进行共轭对称扩展以及 IFFT, 从而 可以获得时域实数序列, 并进行插入 CP形成第一下行时域基带信号, 该第一 下行时域基带信号被加载到 LED照明电路的直流电上后形成 LED驱动电信 号, 从而发射端可以将该 LED驱动电信号转换成 LED可见光束进行传输。 本 发明实施例可以通过 LED可见光来实现数据下行传输, 由于可见光传输无需 无线电频傳证, 不会受到相关政府、 组织的监管, 所以可见光传输不会受传输 资源的限制; 另外, 可见光传输不会受电磁干扰, 不会影响用户的接收性能和 体验, 也不会对人体造成辐射。
其中, 上述图 2所描述的数据传输方法是在 LTE系统中基于 VLC来实现 的, 即 LTE overVLC。 为了更好的理解图 2所描述的数据传输方法, 下面结 合一个具体的 LTE over VLC的下行发射端来进一步详细说明。 请参阅图 3, 图 3为本发明实施例提供的一种 LTE over VLC的下行发射端的结构示意图, 该下行发射端可以用于实现图 2所描述的数据传输方法。在图 3所示的下行发 射端中, 为了尽量减小对现有的 LTE over RF的下行发射端的改变, 完全重用 现有 LTE over RF的资源映射方式, 将信号带宽为 W的 LTE overVLC等效为 信号带宽为 W/2的 LTE over RF。 例如, 信号带宽为 20MHz的 LTE over VLC 等效为信号带宽为 10MHz的 LTEoverRF。其中, 图 3所示的下行发射端用于 实现图 2所描述的数据传输方法的具体过程可以如下:
1 )、 下行用户数据 k的比特序列 >(0),>(1), ...,6(1^-1)在进行星座调制映射之 前, 先进行加扰, 生成加扰比特序列 0),^1),.. «,7-1);
2)、 加扰比特序列 (0), (l),… 进行星座调制映射, 生成复数值调 制符号序列 ^/(0)^(1),〜^(1^6 -1); 其中, 可釆用的星座调制映射方式有 BPSK:、 QPSK, 16QAM以及 64QAM 等。 例如, 如果釆用 QPSK方式进行星座调制映射, 则比特 00可以映射为
-^ + y^, 比特 01可以映射为 _ ^, 比特 10可以映射为— + , 比特 11 映射可以为 - - . 。
3)、 复数值调制符号序列 ^O ^l ^^M^-l)进行 MIMO预编码, 生成预 编码符号序列 (复数值) y(0),y(\),---,y(M^mb-\) ;
4 )、 根据不同物理信道的资源映射规则, 将预编码符号序列 _y(0),_y(l),...,J« -l)进行时域资源映射,可以得到第 /个 OFDM符号的频域数据 为 a,(0),a,(l),"',a,(N-l);
5 )、 对每个 OFDM符号的频域数据 (0),^(1),...,^(^-1)进行共轭对称扩展 ( 即 添 加 共 轭 对 称 数 据 ) , 构 成 新 的 数 据 序 列 (0), (1),… , (W— 1), bjiN)---, b(2N - 2), b(2N— 1) , 每个元素 b与 <3序列的对应关系如下图 4 所示;
6 )、对进行共轭对称扩展(即添加共轭对称数据)后的新的数据序列作 IFFT 变换, 得到时域实数序列; 其中, 可以釆用以下公式( 1 )对进行共轭对称扩 展(即添加共轭对称数据)后的新的数据序列作 IFFT变换:
Figure imgf000013_0001
其中, 波数据的个数, 表示时域实数序列。
7)、为了抵抗由多径所造成的符号间干扰,对 IFFT后的时域实数序列插入
CP, 形成第一下行时域基带信号 (实数序列); 举例来说, 可以将该 OFDM符号的后 G个符号拷贝至 OFDM最前面, 实现 对 IFFT后的时域实数序列插入 CP, 形成第一下行时域基带信号 (实数序歹l )。 8)、 将上述的第一下行时域基带信号加载到 LED照明电路的直流电上, 形成 LED驱动电信号;
9 )、 将上述的 LED驱动电信号转换成 LED的可见光束进行传输。 其中, 对于上述的 8 )与 9 )的具体实现过程本发明实施例后续将结合具体 的实施例进行伴细说明。 以上结合了一种具体的 LTE over VLC的下行发射端对图 2所描述的数据 传输方法进行说明。 其中, 图 2所描述的是一种 LTE over VLC的数据下行传 输方法。 针对图 2所描述的 LTE over VLC的数据下行传输方法, 本发明实施 例还相应地提供的一种下行接收端(类似用户侧终端)的数据处理方法, 该下 行接收端的数据处理方法的实现过程如图 5所示, 可以包括如下步骤。
501、接收端接收 LED可见光束并进行光电转换, 获得第一下行时域基带 信号 (实数序列)。
在图 5所描述的方法中, 接收端可以是手机、 笔记本或者其他智能设备, 本发明实施例不作限定。
其中, 接收端对接收到的 LED可见光束进行光电转换可以获得电信号, 从该电信号中可以提取出第一下行时域基带信号 (实数序列)。
502、接收端对获得的第一下行时域基带信号进行去 CP、 FFT以及去共轭 对称处理, 获得 OFDM符号的频域数据。
503、接收端对获得的 OFDM符号的频域数据进行资源去映射处理, 获得 预编码符号序列。 解星座调制映射以及解扰处理, 获得下行用户数据。
其中, 上述的 MIMO检测和信道均衡是 MIMO预编码的逆过程, 即接收 端对获得的预编码符号序列进行 MIMO检测和信道均衡后, 可以获得复数值 调制符号序列;复数值调制符号序列再经过解星座调制映射处理可以获得加扰 比特序列; 加扰比特序列再经过解扰即可获得下行用户数据。
为了更好的理解图 5所描述的接收端数据处理方法,下面结合一个具体的 LTE over VLC的下行接收端来进一步详细说明。请参阅图 6, 图 6为本发明实 施例提供的一种 LTE over VLC的下行接收端的结构示意图, 该下行接收端可 以用于实现图 5所描述的数据处理方法。其中, 图 6所示的下行接收端用于实 现图 5所描述的数据处理方法的具体过程可以如下:
1 )、 在接收到 LED可见光束后, 对 LED可见光束进行光电转换处理, 得 到第一下行时域基带信号, 该第一下行时域基带信号为实数序列, 先去掉 CP, 获得时域实数序列。
2 )、 对去掉 CP的时域实数序列进行 FFT, 获得共轭对称扩展后的数据序 列。
3 )、 对上述的共轭对称扩展后的数据序列进行去共轭对称处理, 获得 OFDM符号的频域数据。
4 )根据 LTE不同物理信道的资源映射规则, 釆用相应的资源解映射方式 对上述的 OFDM符号的频域数据进行资源去映射处理,获得预编码符号序列。
5 )根据发射端所釆用的 MIMO传输方式, 进行 MIMO检测和信道均衡, 获得经过星座调制映射后的复数值调制符号序列;
6 )、对上述的复数值调制符号序列进行解星座调制映射处理, 获得经过加 扰的加扰比特序列;
7 )、 对上述的加扰比特序列进行解扰, 得到相应的下行用户数据。
作为一个可选的实施方式,在图 2所描述的数据传输方法中, 下行发射端 在执行步骤 203中的对 OFDM符号的频域数据进行共轭对称扩展之前, 可以 接收用于指示发射端釆用 VLC模式传输数据的上层第一调度命令。换句话说, 下行发射端是在接收到上层第一调度命令之后,才执行图 2所描述的 LTE over VLC的数据下行传输方法。
作为一个可选的实施方式,在图 2所描述的数据传输方法中, 下行发射端 也可以接收用于指示发射端釆用 RF通信模式传输数据的上层第二调度命令; 则下行发射端在执行完毕上述的步骤 201、 步骤 202, 并获得 OFDM符号的频 域数据之后,下行发射端可以直接对该 ODFM符号的频域数据进行 IFFT以及 插入 CP处理,形成第二下行时域基带信号(复数序列 )并通过射频进行传输, 即下行发射端釆用 LTE over RL模式进行数据传输。 在这种实施方式下, 下行 发射端就具备了双模下行传输功能, 即下行发射端可以仅选择釆用 LTE over VLC模式来进行数据下行传输,也可以仅釆用 LTE over RL模式来进行数据下 行传输;或者,下行发射端可以同时选择釆用 LTE over VLC模式和来 LTE over RL模式进行下行数据传输。
作为一个可选的实施方式, 下行发射端在对时域实数序列进行插入 CP处 理, 形成第一下行时域基带信号之后, 可以对该第一下行时域基带信号进行放 大和预失真处理,然后再将进行放大和预失真处理后的第一下行时域基带信号 加载到 LED照明电路的直流电上, 形成 LED驱动电信号。
在实际应用中, 为了保证光强度, 一般是多个 LED构成一组, 简称 LED 灯组。 也就是说, 本发明实施例前面提及的 LED可以位于由至少两个 LED构 成的任意一个 LED灯组中。 特别是在室内中, 由于照明的原因, 一般需要安 装多个 LED灯组。 举例来说, 一种室内 LED灯组的布局可以如图 7所示。 其 中, 室内一共布置了 、 B、 C、 D、 E这 5个 LED灯组, 这 5个 LED灯组可 以分别位于天花板的 4个角及中间位置,而且每个 LED灯组由 4个 LED组成。 因为有多个 LED同时发光, 因此, 可以实现基于可见光的 MIMO传输。
以图 7所示的 LED灯组布局为例, 每个 LED灯组中的每个 LED的可见 光束传输数据也相同, 并且每个 LED灯组的可见光束传输数据也可以相同。 如图 8所示, 每个 LED灯组及其各自的 LED的可见光束都传输相同的数据 d0, 从而可以获得分集增益, 提高传输的可靠性。
同样, 以图 7所示的 LED灯组布局为例, 每个 LED灯组中的每个 LED 的可见光束传输数据可以不相同, 但是每个 LED灯组的可见光束传输数据相 同。 如图 9所示, 5个 LED灯组通过各自的 4个 LED传输数据 d0, dl , d2, d3; 从而可以获得分集增益和复用增益。
同样,仍以图 7所示的 LED灯组布局为例,每个 LED灯组中的每个 LED 的可见光束传输数据可以不相同, 并且每个 LED灯组的可见光束传输数据也 可以不相同。 如图 10所示, LED灯组 A中四个 LED分别传输的数据是 d0, dl , d2, d3; LED灯组 B中四个 LED分别传输的数据是 d4, d5, d6, d7; LED灯组 C中四个 LED分别传输的数据是 d8, d9, dlO, dl l ; LED灯组 D 中四个 LED分别传输的数据是 dl2, dl3 , dl4, dl5; 而 LED灯组 E中四个 LED分别传输的数据是 dl6, dl7, dl8, dl9; 从而可以提高可见光 MIMO传 输容量。
目前, 在 LTE over RF的上行传输过程中, LTE系统釆用了具有较低峰均 比 ( Peak to average power ratio , PAPR ) 的单载波频分复用 ( Single-carrier Frequency-Division Multiple Access, SC-FDMA )技术。 现有的 LTE over RF的 上行发射端的结构示意图如图 11。 其中, 上行用户数据依次进行加扰、 星座 调制映射、 MIMO预编码、离散傅立叶变换( Discrete Fourier Transform, DFT )、 SC-FDMA资源映射、 IFFT以及插入 CP处理后, 获得上行时域基带信号并通 过射频进行传输。 与图 1所示的下行发射端类似, 在图 11所示的上行发射端 中, 经过 IFFT输出的信号为复数, 并不能直接驱动 LED可见光通信。
请参阅图 12, 图 12为本发明实施例提供的一种数据传输方法的流程示意 图, 该方法能够在不受传输资源限制、无电磁干扰以及对人体无辐射的情况下 实现数据上行传输。 如图 12所示, 该数据传输方法可以包括如下步骤。
1201、发射端将上行用户数据依次进行加扰、 星座调制映射、 MIMO预编 码以及 DFT , 获得 DFT符号序列。
举例来说, 发射端可以釆用的星座调制映射的方式有 BPSK:、 QPSK,
16QAM、 64QAM等等。
在图 12所描述的方法中,发射端可以是手机、笔记本或者其他智能设备, 本发明实施例不作限定。
1202、 发射端将上述的 DFT符号序列进行 SC-FDMA 资源映射, 获得 SC-FDMA符号的频域数据。
其中, 发射端可以根据不同物理信道的资源映射规则, 将上述的 DFT符 号序列映射到 SC-FDMA时频资源上,从而可以得到 SC-FDMA符号的频域数 据。
1203、发射端对上述的 SC-FDMA符号的频域数据进行共轭对称扩展以及 IFFT, 获得时域实数序列。
本发明实施例中,发射端对上述的 SC-FDMA符号的频域数据进行共轭对 称扩展是指对上述的 SC-FDMA符号的频域数据添加共轭对称数据。 其中, 对 添加共轭对称数据之后的 SC-FDMA符号的频域数据进行 IFFT可以获得时域 实数序列。
1204、 发射端对上述的时域实数序列进行插入 CP处理, 形成第一上行时 域基带信号。
1205、 发射端将上述的第一上行时域基带信号加载到 LED照明电路的直 流电上, 形成 LED驱动电信号。
1206、发射端将上述的 LED驱动电信号转换成 LED的可见光束进行传输。 可选地, 在上述步骤 1205中, 发射端也可以将上述的第一上行时域基带 信号(实数序列)加载到荧光灯照明电路的直流电上, 形成荧光灯的驱动电信 号; 相应地, 在上述步骤 1206中, 发射端可以将荧光灯的驱动电信号转换成 荧光灯的可见光束进行传输。
本发明实施例中 ,发射端在上行方向上获得 SC-FDMA符号的频域数据之 后, 对该 SC-FDMA符号的频域数据进行共轭对称扩展以及 IFFT, 从而可以 获得时域实数序列, 并进行插入 CP处理形成第一上行时域基带信号, 该第一 上行时域基带信号被加载到 LED照明电路的直流电上后形成 LED驱动电信 号, 从而发射端可以将该 LED驱动电信号转换成 LED的可见光束进行传输。 可见, 本发明实施例可以通过 LED的可见光来实现数据的上行传输。 由于可 见光传输无需无线电频傳证, 不会受到相关政府、 组织的监管, 所以可见光传 输不会受传输资源的限制; 另外, 可见光传输不会受电磁干扰, 不会影响用户 的接收性能和体验, 也不会对人体造成辐射。
其中, 上述图 12所描述的数据传输方法是在 LTE系统中基于 VLC来实 现的, 即 LTE over VLC。 为了更好的理解图 12所描述的数据传输方法, 下面 结合一个具体的 LTE over VLC的上行发射端来进一步详细说明。请参阅图 13 , 图 13为本发明实施例提供的一种 LTE over VLC的上行发射端的结构示意图, 该上行发射端可以用于实现图 12所描述的数据传输方法。在图 13所示的上行 发射端中, 为了尽量减小对现有的 LTE over RF的上行发射端的改变, 完全重 用现有 LTE over RF的资源映射方式, 将信号带宽为 W的 LTE over VLC等效 为信号带宽为 W/2的 LTE over RF。 其中, 图 13所示的上行发射端用于实现 图 12所描述的数据传输方法的具体过程可以如下: 11 )、 上行用户数据的比特序列 ,u (Mbu - 1)进行在星座调制映射之 前, 先进行力口 4尤, 生成力口 4尤比特序歹' J (0), (1),···,έ( ω_1);
12 )、加扰比特序列 (0), (1),···, (Μω-1)进行星座调制映射,生成复数值调 制符号序列 0), 1),···, Μ^¾-1); 其中,可釆用的星座调制映射方式有 BPSK、 QPSK、 16QAM,、 64QAM等。 例如, 如果釆用 QPSK方式进行星座调制映射, 则比特 00可以映射为 +/ ,
V2 V2 比特 01可以映射为 比特 10可以映射为— , 比特 11可以映射为
1 , 1
—n 。
13 )、 复数值调制符号序列 0), 1),···, Μ -1)进行 MIMO预编码后分成 MsymbA^USeH个集合,每个集合与一个 SC-FDMA符号对应, 然后作 DFT变换, 获得 DFT符号序列。 其中, 可以釆用如下公式(2)来进行 DFT:
Λ MS P C USCH- 1 - / LNIK
Z(/- S P C USCH = y' i(/- s p c USCH+z -USCH
Figure imgf000019_0001
^ = 0,..., S P C USCH-1
/ = 0,,...,, sym Jb I S sP C cUSCH-1 其中, 2(0) 1),一 ^ 6-1)表示生成的 DFT符号序列(即复数值符号序列 ), 其中 M£USCH
Figure imgf000019_0002
, Ns 为一个资源块( Resource block, RB )在频域占用
M PUSCH
、 υ"υ "ιι ι, ^,, RE 为上行物理共享信道(Physical uplink shared channel, PUSCH)上行传输所占用的资源块数目, Ms pusch为上行物理共 享信道(Physical uplink shared channel, PUSCH )上行传输所占用的子载波数 目; ^表示复数值调制符号的个数。
14 )、 根据不同物理信道的资源映射规则, 将 DFT符号序列
Figure imgf000020_0001
-l)进行 SC-FDMA资源映射, 可以得到第 /个 SC-FDMA符号的频 域数据为 a! (0), a, (1),… , a, (N - 1);
15 )、 对每个 SC-FDMA符号的频域数据 (Ο),^(ΐ),…, (N-l)进行共轭扩展 ( 即 添 加 共 轭 对 称 数 据 ) , 构 成 新 的 数 据 序 列 bj (0), bj (1), ·■ ·, ¾ (TV - 1), ¾ (TV) ·■ · , b(2N - 2), b(2N - 1) , 其中, 每个元素 b与"序列的对应关系如 图 4所示;
16 )、 对进行共轭对称扩展(即添加共轭对称数据)后的新的数据序列作
IFFT变换, 得到时域实数序列; 其中, 可以釆用以下上述公式( 1 )对进行共 轭对称扩展(即添加共轭对称数据)后的新的数据序列作 IFFT变换。 17 )、 为了抵抗由多径所造成的符号间干扰, 对 IFFT后的时域实数序列插 入 CP, 形成第一上行时域基带信号 (单路实数序列);
18 )、 将上述的第一上行时域基带信号加载到 LED照明电路的直流电上, 形成 LED驱动电信号;
19 )、 将上述的 LED驱动电信号转换成 LED的可见光束进行传输。
其中, 对于上述的 18 )与 19 )的具体实现过程本发明实施例后续将结合具 体的实施例进行详细说明。 以上结合了一种具体的 LTE over VLC的上行发射端对图 12所描述的数据 传输方法进行说明。 其中, 图 12所描述的是一种 LTE over VLC数据上行传输 方法。针对图 12所描述的 LTE over VLC的数据上行传输方法, 本发明实施例 还相应地提供的一种上行接收端(类似网络侧基站)的数据处理方法, 该上行 接收端的数据处理方法的实现过程如图 14所示, 可以包括如下步骤。
1401、 接收端接收 LED可见光束并进行光电转换, 获得第一上行时域基 带信号 (实数序列)。
1402、接收端对获得的第一上行时域基带信号进行去 CP、 FFT以及去共轭 对称处理, 获得 SC-FDMA符号的频域数据;
1403、接收端对获得的 SC-FDMA符号的频域数据依次进行 SC-FDMA资源 去映射、 离散傅立叶逆变换 ( Inverse Discrete Fourier Transform, IDFT )、 MIMO 检测和信道均衡、 解星座调制映射以及解扰处理, 获得上行用户数据。
为了更好的理解图 14所描述的接收端数据处理方法, 下面结合一个具体 的 LTE over VLC的上行接收端来进一步详细说明。 请参阅图 15, 图 15为本 发明实施例提供的一种 LTE over VLC的上行接收端的结构示意图, 该上行接 收端可以用于实现图 14所描述的数据处理方法。 其中, 图 15所示的上行接收 端用于实现图 14所描述的数据处理方法的具体过程可以如下:
1 )、 在接收到 LED可见光束后, 对 LED可见光束进行光电转换处理, 得 到第一上行时域基带信号, 该第一上行时域基带信号为实数序列, 先去掉 CP, 获得时域实数序列。
2 )、 对去掉 CP的时域实数序列进行 FFT, 获得共轭对称扩展后的数据序 列。
3 )、 对上述的共轭对称扩展后的数据序列进行去共轭对称处理, 获得
SC-FDMA符号的频域数据。
4 )、 根据 LTE不同物理信道的资源映射规则, 釆用相应的资源解映射方 式对上述的 SC-FDMA符号的频域数据进行 SC-FDMA资源去映射处理,获得 DFT符号序列。
5 )、 上述的 DFT符号序列进行 IDFT、 MIMO检测和信道均衡处理, 获得 经过星座调制映射后的复数值调制符号序列;
6 )、对上述的复数值调制符号序列进行解星座调制映射处理, 获得经过加 扰的加扰比特序列;
7 )、 对上述的加扰比特序列进行解扰, 得到相应的上行用户数据。
作为一个可选的实施方式, 在图 12所描述的数据传输方法中, 上行发射 端在执行步骤 1203中的对 SC-FDMA符号的频域数据进行共轭对称扩展之前, 可以接收用于指示发射端釆用 VLC模式传输数据的上层第一调度命令。 换句 话说, 上行发射端是在接收到上层第一调度命令之后, 才执行图 12所描述的 LTE over VLC的数据上行传输方法。
作为一个可选的实施方式, 在图 12所描述的数据传输方法中, 上行发射 端也可以接收用于指示发射端釆用 RF通信模式传输数据的上层第二调度命 令; 则上行发射端在执行完毕上述的步骤 1201、 步骤 1202, 并获得 SC-FDMA 符号的频域数据之后, 可以直接对该 SC-FDMA符号的频域数据进行 IFFT以 及插入 CP处理, 形成第二上行时域基带信号(复数序列 )并通过射频进行传 输, 即上行发射端釆用了 LTE over RL模式进行数据上行传输。 在这种实施方 式下, 上行发射端就具备了双模上行传输功能, 即上行发射端可以仅选择釆用 LTE over VLC模式来进行数据上行传输,也可以仅釆用 LTE over RL模式来进 行数据上行传输; 或者, 上行发射端可以同时选择釆用 LTE over VLC模式和 来 LTE over RL模式进行数据上行传输。
如前面所述,在下行传输方向上, 下行发射端可以根据上层第一调度命令 的指示釆用 LTE over VLC模式或根据上层第二调度命令的指示釆 LTE over RL模式来进行数据下行传输。 下面再结合具体的实施例来进行描述。
请参阅图 16,图 16为本发明实施例提供的一种下行发射端的结构示意图。 其中, 该下行发射端可以釆用 LTE over RL模式或 LTE over VLC模式进行数 据下行传输。 如图 16所示, 该下行发射端可以设置如下模块:
通道选择模块, 用于接收上层第一调度命令或上层第二调度命令。
生成下行时域基带信号模块,用于在通道选择模块接收到上层第一调度命 令, 按照图 3所示的流程生成第一下行时域基带信号, 此时, 第一下行时域基 带信号为实数序列, 并输入至 LED驱动模块; 或者, 在通道选择模块接收到 上层第二调度命令, 按照如图 1所流程生成第二下行时域基带信号, 此时, 第 二下行时域基带信号为复数序列, 并输入至射频发射模块。
作为一个可选的实施方式,生成下行时域基带信号模块将实数序列的第一 下行时域基带信号输入至 LED驱动模块的同时, 可以向射频发射模块输入一 些预先定义的导频或同步信号, 以便用户进行射频信道的检测和快速切换。
同样,作为一个可选的实施方式, 生成下行时域基带信号模块将复数序列 的第二下行时域基带信号输入至射频发射模块的同时, 可以向 LED驱动模块 输入一些预先定义的导频或同步信号, 以便用户进行 VLC信道的检测和快速 切换。
LED驱动模块, 其输入是 LED照明电路的直流电和生成下行时域基带信 号模块输入的第一下行时域基带信号(实数序列)。 其中, LED驱动模块可以 将该第一下行时域基带信号进行放大和失真处理后加载到 LED照明电路的直 流电上, 形成 LED驱动电信号并输出至 LED模块。
其中,关于 LED驱动模块的具体结构本发明实施例后续将进行详细说明。
LED模块,其输入是 LED驱动模块输出的 LED驱动电信号,并将该 LED 驱动电信号转换成 LED可见光束进行传输, 即 LED不仅提供照明而且还作为 LTE下行信道的发射天线使用。
本发明实施例中, LED驱动模块与 LED模块相互配合, 可以实现前面图 3中所描述的步骤 8 )与步骤 9 )。
射频发射模块,用于将生成下行时域基带信号模块输入的第二下行时域基 带信号 (复数序列 ) 直接通过射频进行传输。
本发明实施例中,图 16所示的下行发射端可以进一步细化成如图 17所示。 其中, 图 17所示的下行发射端可以看作是图 1和图 3所示的下行发射端的优 化组合。 在图 17所示的下行发射端中需要添加或修改如下模块:
1、 RF/VLC资源映射模块:
在传统 LTE系统中, 资源映射模块只把数据映射到 RF模式下的 OFDM 时频资源上。 而在本发明实施例中, 下行发射端可以根据上层第一调度命令选 取 LTE over RL模式进行数据下行传输, 或者根据上层第二调度命令选择 LTE over RL模式进行数据下行传输。 如果下行发射端接收到上层第一调度命令, 贝' J RF/VLC 资源映射模块将 MIMO预编码后的预编码符号序列映射到 LTE over VLC模式下的 OFDM时频资源上, 并执行 LTE over VLC模式下的后续 流程; 如果下行发射端接收到上层第二调度命令, 则 RF/VLC资源映射模块将 MIMO预编码后的预编码符号序列映射到 LTE over RF模式下的 OFDM时频 资源上,并执行 LTE over RF模式下的后续流程。与传统的资源映射模块相比, 本模块多了个传输模式(RF/VLC ) 自适应的功能。 其中, 两种模式的有效子 载波数目 (即可以用于加载信号的子载波数目)可能不同。 对于 LTE over RF 模式, 有效的子载波数目即等于 OFDM时频资源的子载波数目; 而对于 LTE over VLC模式,有效的子载波数目等于 OFDM时频资源的子载波数目的一半。 例如在 LTE over VLC模式下, 含有 2048个子载波的 OFDM时频资源拥有的 有效子载波数目是 1024。 这是因为 LTE over VLC模式要求子载波上的信号具 有共轭对称性, 所以有一半的子载波不能使用。
其中,本模块将预编码符号序列映射到 LTE over VLC模式的 OFDM时频 资源时所釆用的方法与将预编码符号序列映射到含有同等数量的有效子载波 的 LTE over RF模式的 OFDM时频资源时所釆用的方法一致。 例如, 将预编 码符号序列映射到含有 1024个有效子载波的 LTE over VLC模式(实际拥有 2048个子载波) 的 OFDM时频资源时所釆用的方法与将预编码符号序列映射 到含有 1024个子载波的 LTE over RF模式的 OFDM时频资源时所釆用的方法 一致。 因此, 可以复用传统 LTE系统的资源映射模块(LTE over RF模式), 而不需要重新设计新的资源映射模块。
2、 共轭对称扩展模块:
该模块用于将并行输入的预编码符号序列进行共轭对称扩展。 如图 18所 示, 记A,A,A,..., V为N个并行输入的的预编码符号序列 (频率从低到高), 则共轭对称扩展为2N个并行的符号序列A,A,A,..., v,A,^, —1,...,A*。其中, 第一个符号对应的是直流的子载波(DC )。 通常而言, 直流子载波是不用于传 输信号的, 即 A = 0。 其中,图 17所示的下行发射端中,共轭对称扩展模块可以和其后面的 IFFT 模块可以联合起来优化设计, 从而降低计算复杂度, 本发明实施例不作限定。
相应地, 本发明实施例中, 下行接收端在下行传输方向上也可以通过 LTE over RL或 LTE over VLC模式来接收下行传输数据。其中, 下行接收端釆用与 下行发射端相同的模式接收下行传输数据。 请参阅图 19, 图 19为本发明实施 例提供的另一种下行接收端的结构示意图。其中, 该下行接收端可以通过 LTE over RL或 LTE over VLC模式来接收下行传输数据。 如图 19所示, 该下行接 收端可以设置如下模块:
1、 光信号聚焦模块:
其中, 光信号聚焦模块用于将 LED可见光束(即光信号 )聚焦到光电检 测器件上面, 以提高接收到的 LED可见光的光强度。 通常, 该模块由光学透 镜组成。
2、 光电检测信号放大模块:
其中, 该模块主要用于将输入的 LED可见光转化为电信号, 获得第一下 行时域基带信号 (实数序列), 并进行预失真补偿和信号放大处理。
3、 射频接收模块:
其中, 该模块主要用于通过 LTE over RL模式接收发射端传输的第二下行 时域基带信号 (复数序列)。
4、 通道选择模块:
其中, 该模块主要用于根据上层调度命令来选择通过 LTE over RL或 LTE over VLC模式接收 LED可见光(即下行传输数据), 并输出至下行时域基带 信号处理模块。
5、 下行时域基带信号处理模块:
如果通道选择模块接收到上层第二调度命令,则下行时域基带信号处理模 块可以按照传统 LTE下行数据处理方法, 将射频接收模块输出的第二下行时 域基带信号 (复数序列 )依次进行去 CP、 FFT、 资源去映射、 MIMO检测和 信道均衡、 解星座调制映射以及解扰处理, 获得下行用户数据。
如果通道选择模块接收到上层第一调度命令,则下行时域基带信号处理模 块可以根据图 5所示的方法,将光电检测信号放大模块输出的第一下行时域基 带信号(实数序列 )依次进行去 CP、 FFT、 去共轭对称、 资源去映射、 MIMO 检测和信道均衡、 解星座调制映射以及解扰处理, 获得下行用户数据。
6、 备用信道检测模块(可选):
其中, 该模块主要用于将备用信道的信道质量反馈给上层协议单元, 以方 便系统进行传输模式的选择。 例如, 若下行发射端釆用 LTE over RL模式进行 数据下行传输, 则该模块从光电检测信号放大模块的输出信号中检测 VLC信 道质量, 并且把结果反馈给上层协议处理单元; 若下行发射端釆用 LTE over VLC模式进行数据下行传输, 则该模块从射频接收模块的输出信号中检测 RF 信道质量, 并且把结果反馈给上层协议处理单元。
其中, 在图 19所示的下行接收端中, 下行时域基带信号处理模块可以进 —步细化, 如图 20所示。 其中, 当通道选择模块接收到上层第一调度命令时, 下行时域基带信号处理模块的处理过程与图 6相同,即对光电检测信号放大模 块输出的第一下行时域基带信号 (实数序列 )依次进行去掉 CP、 FFT、 去共 轭对称、资源去映射、 MIMO检测和信道均衡、解星座调制映射以及解扰处理, 得到相应的下行用户数据。
其中, 当通道选择模块接收到上层第二调度命令时, 下行时域基带信号处 理模块的处理过程为: 对射频接收模块输出的第二下行时域基带信号(复数序 列 )依次进行去掉 CP、 FFT、 资源去映射、 MIMO检测和信道均衡、 解星座 调制映射以及解扰处理, 得到相应的下行用户数据。 即, 当通道选择模块接收 到上层第二调度命令时, 图 20中的去共轭对称模块不起作用, 信号透明传输 至 OFDM资源去映射模块进行处理。
如前面所述, 发射端可以同时釆用 LTE over VLC模式和 LTE over RL模 式来进行数据下行传输, 实现双模下行传输。 其中, 发射端可以将 LTE over VLC模式传输等效成为载波汇聚的一个单独频点, 从而尽量复用传统 LTE系 统的已有模块, 减少对现有 LTE标准的影响。 下面再结合具体的实施例来进 行描述。
请参阅图 21 , 图 21为本发明实施例提供的另一种下行发射端的结构示意 图。 其中, 该下行发射端可以同时釆用 LTE over RL模式和 LTE over VLC模 式进行数据下行传输, 实现双模下行传输。 如图 21所示, 该下行发射端的结 构与图 16所示的下行发射端类似, 仅仅省去了通道选择模块。 其中, 在图 21 所示的下行发射端中, 生成下行时域基带信号模块可以同时按照图 1 和图 3 所示的过程生成复数序列的第二下行时域基带信号以及实数序列的第一下行 时域基带信号; 并将复数序列的第二下行时域基带信号直接通过射频进行传 输, 而实数序列的第一下行时域基带信号通过 LED可见光进行传输。 作为一个可选的实施方式, 本发明实施例中, 当下行发射端同时釆用 LTE over RL模式和 LTE over VLC模式进行数据下行传输时,下行发射端可以将同 一路下行用户数据分别生成第二下行时域基带信号(复数序列)以及第一下行 时域基带信号 (实数序列), 将第二下行时域基带信号 (复数序列 ) 直接通过 射频进行传输, 而将第一下行时域基带信号 (实数序列 )通过 LED可见光进 行传输。
作为另一个可选的实施方式, 本发明实施例中, 当下行发射端同时釆用 LTE over RL模式和 LTE over VLC模式进行数据下行传输时,下行发射端可以 将多路下行用户数据中的部分下行用户数据生成第二下行时域基带信号(复数 序列),并将剩余部分的下行用户数据生成第一下行时域基带信号(实数序列), 将第二下行时域基带信号(复数序列 )直接通过射频进行传输, 而将第一下行 时域基带信号 (实数序列 )通过 LED可见光进行传输。
与图 21所示的下行发射端对应, 本发明实施例中, 下行接收端在下行传 输方向上也可以同时通过 LTE over RL和 LTE over VLC模式来接收下行传输 数据。 请参阅图 22, 图 22为本发明实施例提供的另一种下行接收端的结构示 意图。 其中, 该下行接收端可以同时通过 LTE over RL和 LTE over VLC模式 来接收下行传输数据。 其中, 图 22所示的下行接收端中, 光电检测信号放大 模块的功能与图 19所示的光电检测信号放大模块的功能相同; 射频发射模块 的功能与图 19所示的射频发射模块的功能相同。本发明实施例中, 图 22所示 的下行接收端中的下行时域基带信号处理模块可以细化成图 23所示, 可以对 光电检测信号放大模块输出的第一下行时域基带信号(实数序列)依次进行去 掉 CP、 FFT、 去共轭对称、 资源去映射、 MIMO检测和信道均衡、 解星座调 制映射以及解扰处理, 得到相应的下行用户数据; 以及, 对射频发射模块输出 的第二下行时域基带信号(复数序列)依次进行去掉 CP、 FFT、 资源去映射、 MIMO检测和信道均衡、解星座调制映射以及解扰处理,得到相应的下行用户 数据。
如前面所述,在上行传输方向上, 上行发射端可以根据上层第一调度命令 的指示釆用 LTE over VLC模式或根据上层第二调度命令的指示釆 LTE over RL模式来进行数据上行传输。 下面再结合具体的实施例来进行描述。 请参阅图 24,图 24为本发明实施例提供的一种上行发射端的结构示意图。 其中, 该上行发射端可以釆用 LTE over RL模式或 LTE over VLC模式进行数 据上行传输。其中, 图 24所示的上行发射端的结构与图 16所示的下行发射端 的结构类似, 不同的是在图 24所示的上行发射端中, 生成上行时域基带信号 模块可以细化成图 25所示。如图 25所示, 当通道选择模块接收到上层第一调 度命令时, 生成上行时域基带信号模块可以将上行用户数据分别进行加扰、星 座调制映射、 MIMO预编码、 DFT、 SC-FDMA资源映射、共轭对称扩展、 IFFT 以及插入 CP, 形成第一上行时域基带信号 (实数序列), 并通过 LED可见光 进行传输。 当通道选择模块接收到上层第二调度命令时, 生成上行时域基带信 号模块可以将上行用户数据分别进行加扰、 星座调制映射、 MIMO预编码、 DFT、 SC-FDMA资源映射、 IFFT以及插入 CP, 形成第二上行时域基带信号 (复数序列), 并通过射频进行传输。 即, 当通道选择模块接收到上层第二调 度命令时, 生成下行时域基带信号模块中的对称共轭扩展模块不起作用。
其中, 在图 24所示的上行发射端中, LED驱动模块与 LED灯的配合, 可以实现上述的步骤 18 )与步骤 19 )。
与图 24所示的上行发射端对应, 本发明实施例中, 在上行传输方向上, 上行接收端也可以通过 LTE over RL或 LTE over VLC模式来接收上行传输数 据。 其中, 该上行接收端釆用与上行发射端相同的模式接收上行传输数据。 请 参阅图 26, 图 26为本发明实施例提供的另一种上行接收端的结构示意图。 其 中, 图 26所示的上行接收端的结构与图 19所示的下行接收端的结构类似, 不 同的是, 当上行接收端的通道选择模块接收到上层第一调度命令时, 上行时域 基带信号处理模块可以将光电检测信号放大模块输出的第一上行时域基带信 号(实数序列)依次进行去 CP、 FFT、去共轭对称、 SC-FDMA资源映射、 IDFT、 MIMO检测和信道均衡、 解星座调制映射以及加扰处理, 获得上行用户数据; 当上行接收端的通道选择模块接收到上层第二调度命令时,上行时域基带信号 处理模块可以将射频发射模块输出的第二上行时域基带信号(复数序列 )依次 进行去 CP、 FFT、 SC-FDMA资源映射、 IDFT、 MIMO检测和信道均衡、 解 星座调制映射以及加扰处理, 获得上行用户数据。
如前面所述, 上行发射端也可以同时釆用 LTE over VLC模式和 LTE over RL模式来进行数据上行传输, 实现双模上行传输。 其中, 可以同时釆用 LTE over VLC模式和 LTE over RL模式来进行数据上行传输的上行发射端的结构 与图 21所示的下行发射端的结构类似, 如图 27所示。 不同的是, 在图 27所 示的上行发射端中,生成上行时域基带信号模块可以将上行用户数据分别进行 加扰、 星座调制映射、 MIMO预编码、 DFT、 SC-FDMA资源映射、 共轭对称 扩展、 IFFT以及插入 CP, 形成第一上行时域基带信号 (实数序列 ), 并通过 LED 可见光进行传输; 以及将上行用户数据分别进行加扰、 星座调制映射、 MIMO预编码、 DFT、 SC-FDMA资源映射、 IFFT以及插入 CP, 形成第二上 行时域基带信号 (复数序列), 并通过发射进行传输。
作为一个可选的实施方式, 本发明实施例中, 当上行发射端同时釆用 LTE over RL模式和 LTE over VLC模式进行数据上行传输时,上行发射端可以将同 一路上行用户数据分别生成第二上行时域基带信号(复数序列)以及第一上行 时域基带信号 (实数序列), 将第二上行时域基带信号 (复数序列 ) 直接通过 射频进行传输, 而将第一上行时域基带信号 (实数序列 )通过 LED可见光进 行传输。
与图 27所示的上行发射端对应, 本发明实施例中, 上行接收端在上行传 输方向上也可以同时通过 LTE over RL和 LTE over VLC模式来接收下行传输 数据, 如图 28所示。 其中, 图 28所示的上行接收端的结构与图 22所示的下 行接收端结构类似, 不同的是, 在图 28所示的上行接收端中, 上行时域基带 信号处理模块可以将光电检测信号放大模块输出的第一上行时域基带信号(实 数序列)依次进行去 CP、 FFT、 去共轭对称、 SC-FDMA 资源映射、 IDFT、 MIMO检测和信道均衡、 解星座调制映射以及加扰处理, 获得上行用户数据; 以及将射频发射模块输出的第二上行时域基带信号 (复数序列 )依次进行去 CP、 FFT、 SC-FDMA资源映射、 IDFT、 MIMO检测和信道均衡、 解星座调制 映射以及加扰处理, 获得上行用户数据; 实现双模上行接收。
下面, 本发明实施例进一步对前面介绍的 LED驱动模块进行描述。 本发 明实施例提供的一种 LED驱动模块, 其结构如图 29所示。 其中, 在 LTE over RL模式下, LED驱动模块中的矢量增益调节器(DPD )主要用于纠正无线射 频功率放大器的非线性增益。 而在 LTE over VLC模式下, LED驱动模块需要 将电信号转化为光信号, 而通常转化不是完全线性的, 因此需要在电光转化模 块前添加 DPD, 以增加光信号的强度。 本发明实施例中, DPD可以复用无线 射频的 DPD, 只需要做如下修改:
1、 自适应调节模块, 只需要调节幅度, 不需要调节相位。
2、 查找表, 只需要存储幅度的调节信息, 不需要存储相位调节信息。 此外, 为了保证 DPD可以正常工作, 在发射端可以安装一个光信号的接 收器(如前面提到的光信号聚焦模块), 该接收器接收到的光信号经过光电转 换之后输入 DPD, 用于产生信号幅度调节信息。
以上对本发明实施例提供的数据传输方法进行了清楚、 完整的介绍。本发 明实施例中, 发射端在下行方向上获得 OFDM符号的频域数据之后, 对该 OFDM符号的频域数据进行共轭对称扩展以及 IFFT, 从而可以获得时域实数 序列, 并进行插入 CP处理形成第一下行时域基带信号, 该第一下行时域基带 信号被加载到 LED照明电路的直流电上后形成 LED驱动电信号,从而发射端 可以将该 LED驱动电信号转换成 LED的可见光束进行传输。 另外, 本发明实 施例中, 发射端在上行方向上获得 SC-FDMA符号的频域数据之后, 对该 SC-FDMA符号的频域数据进行共轭对称扩展以及 IFFT,从而可以获得时域实 数序列, 并进行插入 CP处理形成第一上行时域基带信号, 该第一上行时域基 带信号被加载到 LED照明电路的直流电上后形成 LED驱动电信号,从而发射 端可以将该 LED驱动电信号转换成 LED的可见光束进行传输。 可见, 本发明 实施例可以通过 LED的可见光来实现数据的传输。 由于可见光传输无需无线 电频傳证, 不会受到相关政府、 组织的监管, 所以可见光传输不会受传输资源 的限制;另夕卜,可见光传输不会受电磁干扰,不会影响用户的接收性能和体验, 也不会对人体造成辐射。
请参阅图 30,图 30本发明实施例提供的一种发射端的结构示意图。其中, 该发射端能够在不受传输资源限制、无电磁干扰以及对人体无辐射的情况下实 现数据下行传输。 如图 30所示, 该发射端可以包括:
第一处理单元 3001 , 用于将下行用户数据依次进行加扰、 星座调制映射 以及 MIMO预编码处理, 获得预编码符号序列;
第二处理单元 3002, 用于将第一处理单元 3001获得的所述预编码符号序 列进行资源映射, 获得 OFDM符号的频域数据;
第三处理单元 3003 , 用于对第二处理单元 3002获得的 OFDM符号的频 域数据进行共轭对称扩展;
第四处理单元 3004, 用于对第三处理单元 3003进行共轭对称扩展后的频 域数据进行 IFFT, 获得时域实数序列;
第五处理单元 3005, 用于对第四处理单元 3004获得的时域实数序列进行 插入 CP处理, 形成第一下行时域基带信号;
第六处理单元 3006, 用于将第一下行时域基带信号加载到 LED照明电路 的直流电上, 形成 LED驱动电信号;
第七处理单元 3007, 用于将 LED驱动电信号转换成 LED的可见光束进 行传输。
如图 30所示, 该发射端还可以包括:
第八处理单元 3008,用于在第三处理单元 3003对第二处理单元 3002获得的 OFDM符号的频域数据进行共轭对称扩展之前,接收用于指示发射端釆用可见 光通信模式传输数据的第一上层调度命令,并通知第三处理单元 3003对第二处 理单元获得的 OFDM符号的频域数据进行共轭对称扩展。
作为一个可选的实施方式,第八处理单元 3008还用于当接收到用于指示发 射端釆用射频通信模式传输数据的上层第二调度命令时, 通知第四处理单元 3004对第二处理单元 3002获得的 OFDM符号的频域数据进行 IFFT;
相应地, 第四处理单元 3004还用于根据第八处理单元 3008的通知,对第 二处理单元 3002获得的 OFDM符号的频域数据进行 IFFT, 获得时域复数序 列并输出给第五处理单元 3005;
相应地,第五处理单元 3005还用于对第四处理单元 3004获得的时域复数 序列进行插入 CP处理, 形成第二下行时域基带信号并通过射频进行传输。 作为一个可选的实施方式, 第六处理单元 3006还用于在将第一下行时域 基带信号加载到 LED照明电路的直流电之前, 将该第一下行时域基带信号进 行放大和预失真处理。
本发明实施例中, LED位于由至少两个 LED构成的任意一个 LED灯组中, 其中, 每个 LED灯组中的每个 LED的可见光束传输数据相同, 并且每个 LED灯 组的可见光束传输数据相同;
或者, 每个 LED灯组中的每个 LED的可见光束传输数据不相同, 并且每个 LED灯组的可见光束传输数据相同;
或者, 每个 LED灯组中的每个 LED的可见光束传输数据不相同, 并且每个 LED灯组的可见光束传输数据不相同。
请参阅图 31 ,图 31本发明实施例提供的一种发射端的结构示意图。其中, 该发射端能够在不受传输资源限制、无电磁干扰以及对人体无辐射的情况下实 现数据上行传输。 如图 31所示, 该发射端可以包括:
第一处理模块 3101 , 用于将上行用户数据依次进行加扰、 星座调制映射、 MIMO预编码以及 DFT, 获得 DFT符号序列;
第二处理模块 3102, 用于将第一处理模块 3101获得的 DFT符号序列进 行 SC-FDMA资源映射, 获得 SC-FDMA符号的频域数据;
第三处理模块 3103 , 用于将第二处理模块 3102获得的 SC-FDMA符号的 频域数据进行共轭对称扩展;
第四处理模块 3104, 用于对第三处理模块 3103进行共轭对称扩展后的频 域数据进行 IFFT, 获得时域实数序列;
第五处理模块 3105, 用于对第四处理模块 3104获得的时域实数序列进行 插入 CP处理, 形成第一上行时域基带信号;
第六处理模块 3106, 用于将第一上行时域基带信号加载到 LED照明电路 的直流电上, 形成 LED驱动电信号;
第七处理模块 3107, 用于将 LED驱动电信号转换成 LED的可见光束并 传输。
作为一个可选的实施方式, 图 31所示的发射端还可以包括: 第八处理模块 3108,用于在第三处理模块 3101对第二处理模块 3102获得的 SC-FDMA符号的频域数据进行共轭对称扩展之前, 接收用于指示发射端釆用 可见光通信模式传输数据的第一上层调度命令,并通知第三处理单元 3103对第 二处理单元获得的 SC-FDMA符号的频域数据进行共轭对称扩展。
作为一个可选的实施方式,第八处理单元 3108还用于当接收到用于指示发 射端釆用射频通信模式传输数据的上层第二调度命令时, 通知第四处理模块 3104对第二处理模块获 3102得的 SC-FDMA符号的频域数据进行 IFFT;
相应地, 第四处理模块 3104还用于根据第八处理模块 3108的通知,对第 二处理模块 3102获得的 SC-FDMA符号的频域数据进行 IFFT, 获得时域复数 序列并输出给第五处理模块 3105;
相应地,第五处理模块 3105还用于对第四处理模块 3104获得的时域复数 序列进行插入 CP处理, 形成第二上行时域基带信号并通过射频进行传输。
请参阅图 32,图 32本发明实施例提供的一种数据传输系统的结构示意图。 其中, 该数据传输系统能够在不受传输资源限制、无电磁干扰以及对人体无辐 射的情况下实现数据下行传输。 如图 32所示, 该系统可以包括:
发射端 3201 , 用于将下行用户数据依次进行加扰、 星座调制映射以及 MIMO预编码处理,获得预编码符号序列;将该预编码符号序列进行资源映射, 获得 OFDM符号的频域数据; 对该 OFDM符号的频域数据进行共轭对称扩展 以及 IFFT, 获得时域实数序列; 对该时域实数序列进行插入 CP处理, 形成下 行时域基带信号; 将该第一下行时域基带信号加载到 LED照明电路的直流电 上, 形成 LED驱动电信号; 以及将该 LED驱动电信号转换成 LED的可见光 束进行传输。
接收端 3202, 用于接收 LED的可见光束并进行光电转换, 获得第一下行时 域基带信号;对获得的下行时域基带信号进行去 CP、 FFT以及去共轭对称处理, 获得 OFDM符号的频域数据; 对获得的 OFDM符号的频域数据进行资源去映射 处理, 获得预编码符号序列; 以及对获得的预编码符号序列依次进行 MIMO检 测和信道均衡、 解星座调制映射以及解扰处理, 获得下行用户数据。
作为一个可选的实施方式,发射端 3201还用于在对载波数据进行共轭对称 扩展之前,接收用于指示发射端 3201釆用可见光通信模式传输数据的上层第一 调度命令。
作为一个可选的实施方式, 发射端 3201还用于当接收到用于指示发射端 3201釆用射频通信模式传输数据的上层第二调度命令时,在获得 OFDM符号的 频域数据之后, 对 OFDM符号的频域数据进行 IFFT以及插入 CP处理, 形成第 二下行时域基带信号并通过射频进行传输;
相应地,接收端 3202还用于接收发射端 3201通过射频进行传输的第二下行 时域基带信号, 并依次进行去 CP、 FFT、 资源去映射、 MIMO检测和信道均衡、 解星座调制映射以及解扰处理, 获得下行用户数据。
请参阅图 33 ,图 33本发明实施例提供的一种数据传输系统的结构示意图。 其中, 该数据传输系统能够在不受传输资源限制、无电磁干扰以及对人体无辐 射的情况下实现数据上行传输。 如图 33所示, 该系统可以包括:
发射端 3301 , 用于将上行用户数据依次进行加扰、 星座调制映射、 MIMO 预编码以及 DFT, 获得 DFT符号序列; 将 DFT符号序列进行 SC-FDMA资源 映射, 获得 SC-FDMA符号的频域数据; 对该 SC-FDMA符号的频域数据进行 共轭对称扩展以及 IFFT,获得时域实数序列;对该时域实数序列进行插入 CP, 形成第一上行时域基带信号; 将该第一上行时域基带信号加载到 LED照明电 路的直流电上, 形成 LED驱动电信号; 以及将 LED驱动电信号转换成 LED 的可见光束进行传输。
接收端 3302, 用于接收 LED的可见光束并进行光电转换, 获得第一上行时 域基带信号; 对获得的第一上行时域基带信号进行去 CP、 FFT以及去共轭对称 处理, 获得 SC-FDMA符号的频域数据; 对获得的载波数据依次进行 SC-FDMA 资源去映射、 IDFT、 MIMO检测和信道均衡、 解星座调制映射以及解扰处理, 获得上行用户数据。
作为一个可选的实施方式, 发射端 3301还用于在对 SC-FDMA符号的频域 数据进行共轭对称扩展之前,接收用于指示发射端 3301釆用可见光通信模式传 输数据的上层第一调度命令。
作为一个可选的实施方式, 发射端 3301还用于当接收到用于指示发射端 3301釆用射频通信模式传输数据的上层第二调度命令时, 在获得 SC-FDMA符 号的频域数据之后, 对该 SC-FDMA符号的频域数据进行 IFFT以及插入 CP , 形 成第二上行时域基带信号并通过射频进行传输;
相应地,接收端 3302还用于接收发射端 3301通过射频进行传输的第二下行 时域基带信号, 并依次进行去 CP、 FFT、 SC-FDMA资源去映射、 IDFT、 MIMO 检测和信道均衡、 解星座调制映射以及解扰处理, 获得上行用户数据。
本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步 骤是可以通过程序来指令相关的硬件来完成,该程序可以存储于一计算机可读 存储介质中, 存储介质可以包括: 闪存盘、 只读存储器(Read-Only Memory , ROM ), 随机存取器(Random Access Memory, RAM ), 磁盘或光盘等。
以上对本发明实施例所提供的数据传输方法及相关设备、系统进行了详细 施例的说明只是用于帮助理解本发明的方法及其核心思想; 同时,对于本领域 的一般技术人员,依据本发明的思想,在具体实施方式及应用范围上均会有改 变之处, 综上所述, 本说明书内容不应理解为对本发明的限制。

Claims

权 利 要 求
1、 一种数据传输方法, 其特征在于, 包括:
发射端将下行用户数据依次进行加扰、星座调制映射以及多输入多输出预 编码处理, 获得预编码符号序列; 符号的频域数据;
所述发射端对所述正交频分复用符号的频域数据进行共轭对称扩展以及 快速傅立叶逆变换, 获得时域实数序列;
所述发射端对所述时域实数序列进行插入循环前缀处理,形成第一下行时 域基带信号;
所述发射端将所述第一下行时域基带信号加载到发光二极管照明电路的 直流电上, 形成发光二极管驱动电信号;
所述发射端将所述发光二极管驱动电信号转换成所述发光二极管的可见 光束进行传输。
2、 根据权利要求 1所述的数据传输方法, 其特征在于, 还包括: 所述发射端在对所述正交频分复用符号的频域数据进行共轭对称扩展之 前,接收用于指示所述发射端釆用可见光通信模式传输数据的上层第一调度命 令。
3、 根据权利要求 2所述的数据传输方法, 其特征在于, 还包括: 当所述发射端接收到用于指示所述发射端釆用射频通信模式传输数据的 上层第二调度命令时, 所述发射端在获得正交频分复用符号的频域数据之后, 还包括:
对所述正交频分复用符号的频域数据进行快速傅立叶逆变换以及插入循 环前缀处理, 形成第二下行时域基带信号并通过射频进行传输。
4、 根据权利要求 1或 2所述的数据传输方法, 其特征在于, 还包括: 接收端接收所述发光二极管的可见光束并进行光电转换,获得第一下行时 域基带信号;
所述接收端对获得的第一下行时域基带信号进行去循环前缀、快速傅立叶 变换以及去共轭对称处理, 获得正交频分复用符号的频域数据;
所述接收端对获得的正交频分复用符号的频域数据进行资源去映射处理, 获得预编码符号序列;
所述接收端对获得的预编码符号序列依次进行多输入多输出检测和信道 均衡、 解星座调制映射以及解扰处理, 获得下行用户数据。
5、 根据权利要求 1或 2所述的数据传输方法, 其特征在于, 所述发射端在 对所述时域实数序列进行插入循环前缀处理, 形成第一下行时域基带信号之 后, 还包括:
对所述第一下行时域基带信号进行放大和预失真处理;
其中,所述发射端将所述第一下行时域基带信号加载到发光二极管照明电 路的直流电上, 形成发光二极管驱动电信号, 包括:
将放大和预失真处理之后的第一下行时域基带信号加载到发光二极管照 明电路的直流电上, 形成发光二极管驱动电信号。
6、 根据权利要求 1或 2所述的数据传输方法, 其特征在于,
所述发光二极管位于由至少两个发光二极管构成的任意一个发光二极管 灯组中, 其中,每个发光二极管灯组中的每个发光二极管的可见光束传输数据 相同, 并且每个发光二极管灯组的可见光束传输数据相同;
或者,每个发光二极管灯组中的每个发光二极管的可见光束传输数据不相 同, 并且每个发光二极管灯组的可见光束传输数据相同;
或者,每个发光二极管灯组中的每个发光二极管的可见光束传输数据不相 同, 并且每个发光二极管灯组的可见光束传输数据不相同。
7、 一种数据传输方法, 其特征在于, 包括:
发射端将上行用户数据依次进行加扰、星座调制映射、 多输入多输出预编 码以及离散傅立叶变换处理, 获得离散傅立叶变换符号序列;
所述发射端将所述离散傅立叶变换符号序列进行单载波频分复用资源映 射, 获得单载波频分复用符号的频域数据;
所述发射端对所述单载波频分复用符号的频域数据进行共轭对称扩展以 及快速傅立叶逆变换, 获得时域实数序列; 所述发射端对所述时域实数序列进行插入循环前缀处理,形成第一上行时 域基带信号;
所述发射端将所述第一上行时域基带信号加载到发光二极管照明电路的 直流电上, 形成发光二极管驱动电信号;
所述发射端将所述发光二极管驱动电信号转换成所述发光二极管的可见 光束进行传输。
8、 根据权利要求 7所述的数据传输方法, 其特征在于, 还包括: 所述发射端在对所述单载波频分复用符号的频域数据进行共轭对称扩展 之前,接收用于指示所述发射端釆用可见光通信模式传输数据的上层第一调度 命令。
9、 根据权利要求 8所述的数据传输方法, 其特征在于, 还包括: 当所述发射端接收到用于指示所述发射端釆用射频通信模式传输数据的 上层第二调度命令时, 所述发射端在获得单载波频分复用符号的频域数据之 后, 还包括:
对所述单载波频分复用符号的频域数据进行快速傅立叶逆变换以及插入 循环前缀处理, 形成第二上行时域基带信号并通过射频进行传输。
10、 根据权利要求 7或 8所述的数据传输方法, 其特征在于, 还包括: 接收端接收所述发光二极管的可见光束并进行光电转换,获得第一上行时 域基带信号;
所述接收端对获得的第一上行时域基带信号进行去循环前缀、快速傅立叶 变换以及去共轭对称处理, 获得单载波频分复用符号的频域数据;
所述接收端对获得的单载波频分复用符号的频域数据依次进行单载波频 分复用资源去映射、 离散傅立叶逆变换、 多输入多输出检测和信道均衡、 解星 座调制映射以及解扰处理, 获得上行用户数据。
11、 一种发射端, 其特征在于, 包括:
第一处理单元, 用于将下行用户数据依次进行加扰、星座调制映射以及多 输入多输出预编码处理, 获得预编码符号序列;
第二处理单元,用于将所述第一处理单元获得的所述预编码符号序列进行 时频资源映射, 获得正交频分复用符号的频域数据;
第三处理单元,用于对所述第二处理单元获得的所述正交频分复用符号的 频域数据进行共轭对称扩展;
第四处理单元,用于对所述第三处理单元进行共轭对称扩展后的频域数据 进行快速傅立叶逆变换, 获得时域实数序列;
第五处理单元,用于对所述第四处理单元获得的所述时域实数序列进行插 入循环前缀处理, 形成第一下行时域基带信号;
第六处理单元,用于将所述第一下行时域基带信号加载到发光二极管照明 电路的直流电上, 形成发光二极管驱动电信号;
第七处理单元,用于将所述发光二极管驱动电信号转换成所述发光二极管 的可见光束进行传输。
12、 根据权利要求 11所述的发射端, 其特征在于, 还包括:
第八处理单元,用于在所述第三处理单元对所述第二处理单元获得的所述 正交频分复用符号的频域数据进行共轭对称扩展之前,接收用于指示所述发射 端釆用可见光通信模式传输数据的第一上层调度命令,并通知所述第三处理单 元对所述第二处理单元获得的所述正交频分复用符号的频域数据进行共轭对 称扩展。
13、 根据权利要求 12所述的发射端, 其特征在于,
所述第八处理单元,还用于当接收到用于指示所述发射端釆用射频通信模 式传输数据的上层第二调度命令时,通知所述第四处理单元对所述第二处理单 元获得的所述正交频分复用符号的频域数据进行快速傅立叶逆变换;
所述第四处理单元,还用于根据所述第八处理单元的通知,对所述第二处 理单元获得的所述正交频分复用符号的频域数据进行快速傅立叶逆变换,获得 时域复数序列并输出给所述第五处理单元;
所述第五处理单元,还用于对所述第四处理单元获得的所述时域复数序列 进行插入循环前缀处理, 形成第二下行时域基带信号并通过射频进行传输。
14、 根据权利要求 11或 12所述的发射端, 其特征在于,
所述第六处理单元,还用于在将所述第一下行时域基带信号加载到发光二 极管照明电路的直流电之前,将所述第一下行时域基带信号进行放大和预失真 处理。
15、 根据权利要求 11或 12所述的发射端, 其特征在于,
所述发光二极管位于由至少两个发光二极管构成的任意一个发光二极管 灯组中, 其中,每个发光二极管灯组中的每个发光二极管的可见光束传输数据 相同, 并且每个发光二极管灯组的可见光束传输数据相同;
或者,每个发光二极管灯组中的每个发光二极管的可见光束传输数据不相 同, 并且每个发光二极管灯组的可见光束传输数据相同;
或者,每个发光二极管灯组中的每个发光二极管的可见光束传输数据不相 同, 并且每个发光二极管灯组的可见光束传输数据不相同。
16、 一种发射端, 其特征在于, 包括:
第一处理模块, 用于将上行用户数据依次进行加扰、 星座调制映射、 多输 入多输出预编码以及离散傅立叶变换处理 , 获得离散傅立叶变换符号序列; 第二处理模块,用于将所述第一处理模块获得的所述离散傅立叶变换符号 序列进行单载波频分复用资源映射, 获得单载波频分复用符号的频域数据; 第三处理模块,用于将所述第二处理模块获得的所述单载波频分复用符号 的频域数据进行共轭对称扩展;
第四处理模块,用于对所述第三处理模块进行共轭对称扩展后的频域数据 进行快速傅立叶逆变换, 获得时域实数序列;
第五处理模块,用于对第四处理模块获得的所述时域实数序列进行插入循 环前缀处理, 形成第一上行时域基带信号;
第六处理模块,用于将所述第一上行时域基带信号加载到发光二极管照明 电路的直流电上, 形成发光二极管驱动电信号;
第七处理模块,用于将所述发光二极管驱动电信号转换成所述发光二极管 的可见光束进行传输。
17、 根据权利要求 16所述的发射端, 其特征在于, 还包括:
第八处理模块,用于在所述第三处理模块对所述第二处理模块获得的所述 单载波频分复用符号的频域数据进行共轭对称扩展之前,接收用于指示所述发 射端釆用可见光通信模式传输数据的第一上层调度命令,并通知所述第三处理 单元对所述第二处理单元获得的所述单载波频分复用符号的频域数据进行共 轭对称扩展。
18、 根据权利要求 17所述的发射端, 其特征在于,
所述第八处理单元,还用于当接收用于指示所述发射端釆用射频通信模式 传输数据的上层第二调度命令时,通知所述第四处理模块对所述第二处理模块 获得的所述单载波频分复用符号的频域数据进行快速傅立叶逆变换;
所述第四处理模块,还用于根据所述第八处理模块的通知,对所述第二处 理模块获得的所述单载波频分复用符号的频域数据进行快速傅立叶逆变换,获 得时域复数序列并输出给所述第五处理模块;
所述第五处理模块,还用于对所述第四处理模块获得的所述时域复数序列 进行插入循环前缀处理, 形成第二上行时域基带信号并通过射频进行传输。
19、 一种数据传输系统, 其特征在于, 包括:
发射端, 用于将下行用户数据依次进行加扰、星座调制映射以及多输入多 输出预编码处理,获得预编码符号序列; 将所述预编码符号序列进行时频资源 映射, 获得正交频分复用符号的频域数据; 对所述正交频分复用符号的频域数 据进行共轭对称扩展以及快速傅立叶逆变换, 获得时域实数序列; 对所述时域 实数序列进行插入循环前缀处理, 形成第一下行时域基带信号; 将所述第一下 行时域基带信号加载到发光二极管照明电路的直流电上,形成发光二极管驱动 电信号;以及将所述发光二极管驱动电信号转换成所述发光二极管的可见光束 进行传输;
接收端, 用于接收所述发光二极管的可见光束并进行光电转换, 获得第一 下行时域基带信号; 对获得的第一下行时域基带信号进行去循环前缀、快速傅 立叶变换以及去共轭对称处理, 获得正交频分复用符号的频域数据; 对获得的 正交频分复用符号的频域数据进行资源去映射处理, 获得预编码符号序列; 以 及对获得的预编码符号序列依次进行多输入多输出检测和信道均衡、解星座调 制映射以及解扰处理, 获得下行用户数据。
20、 根据权利要求 19所述的数据传输系统, 其特征在于, 所述发射端,还用于在对所述正交频分复用符号的频域数据进行共轭对称 扩展之前,接收用于指示所述发射端釆用可见光通信模式传输数据的上层第一 调度命令。
21、 根据权利要求 20所述的数据传输系统, 其特征在于,
所述发射端,还用于当接收到用于指示所述发射端釆用射频通信模式传输 数据的上层第二调度命令时,在获得正交频分复用符号的频域数据之后,对所 述正交频分复用符号的频域数据进行快速傅立叶逆变换以及插入循环前缀处 理, 形成第二下行时域基带信号并通过射频进行传输;
所述接收端,还用于接收所述发射端通过射频进行传输的第二下行时域基 带信号, 并依次进行去循环前缀、 快速傅立叶变换、 资源去映射处理、 多输入 多输出检测和信道均衡、 解星座调制映射以及解扰处理, 获得下行用户数据。
22、 根据权利要求 19〜21任意一项所述的数据传输系统, 其特征在于, 所述发光二极管位于由至少两个发光二极管构成的任意一个发光二极管 灯组中, 其中,每个发光二极管灯组中的每个发光二极管的可见光束传输数据 相同, 并且每个发光二极管灯组的可见光束传输数据相同;
或者,每个发光二极管灯组中的每个发光二极管的可见光束传输数据不相 同, 并且每个发光二极管灯组的可见光束传输数据相同;
或者,每个发光二极管灯组中的每个发光二极管的可见光束传输数据不相 同, 并且每个发光二极管灯组的可见光束传输数据不相同。
23、 一种数据传输系统, 其特征在于, 包括:
发射端, 用于将上行用户数据依次进行加扰、 星座调制映射、 多输入多输 出预编码以及离散傅立叶变换处理, 获得离散傅立叶变换符号序列; 将所述离 散傅立叶变换符号序列进行单载波频分复用资源映射,获得单载波频分复用符 号的频域数据;对所述单载波频分复用符号的频域数据进行共轭对称扩展以及 快速傅立叶逆变换, 获得时域实数序列; 对所述时域实数序列进行插入循环前 缀处理, 形成第一上行时域基带信号; 将所述第一上行时域基带信号加载到发 光二极管照明电路的直流电上, 形成发光二极管驱动电信号; 以及将所述发光 二极管驱动电信号转换成所述发光二极管的可见光束进行传输; 接收端, 用于接收所述发光二极管的可见光束并进行光电转换, 获得第一 上行时域基带信号; 对获得的第一上行时域基带信号进行去循环前缀、快速傅 立叶变换以及去共轭对称处理, 获得单载波频分复用符号的频域数据; 对获得 的单载波频分复用符号的频域数据依次进行单载波频分复用资源去映射、离散 傅立叶逆变换、多输入多输出检测和信道均衡、解星座调制映射以及解扰处理, 获得上行用户数据。
24、 根据权利要求 23所述的数据传输系统, 其特征在于,
所述发射端,还用于在对所述单载波频分复用符号的频域数据进行共轭对 称扩展之前,接收用于指示所述发射端釆用可见光通信模式传输数据的上层第 一调度命令。
25、 根据权利要求 24所述的数据传输系统, 其特征在于,
所述发射端,还用于当接收到用于指示所述发射端釆用射频通信模式传输 数据的上层第二调度命令时,在获得单载波频分复用符号的频域数据之后,对 所述单载波频分复用符号的频域数据进行快速傅立叶逆变换以及插入循环前 缀处理, 形成第二上行时域基带信号并通过射频进行传输;
所述接收端,还用于接收所述发射端通过射频进行传输的第二下行时域基 带信号, 并依次进行去循环前缀、 快速傅立叶变换、 单载波频分复用资源去映 射、 离散傅立叶逆变换、 多输入多输出检测和信道均衡、 解星座调制映射以及 解扰处理, 获得上行用户数据。
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