CN108809885A - A kind of novel orthogonal space modulator approach based on indoor visible light communication - Google Patents

A kind of novel orthogonal space modulator approach based on indoor visible light communication Download PDF

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CN108809885A
CN108809885A CN201810390495.1A CN201810390495A CN108809885A CN 108809885 A CN108809885 A CN 108809885A CN 201810390495 A CN201810390495 A CN 201810390495A CN 108809885 A CN108809885 A CN 108809885A
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nsqm
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visible light
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CN108809885B (en
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李宗艳
单宝玲
李世银
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)

Abstract

The present invention discloses a kind of novel orthogonal space modulator approach based on indoor visible light communication, and step is：Based on SQM schemes, according to maximal possibility estimation criterion, under conditions of not considering activated LED serial numbers, estimated expression of the demodulator to transmission signal is provided；Using PEP and UB technologies, the SER expression formulas under SQM modes are provided；According to SER expression formulas, the BER expression formulas under SQM modes are provided；According to the expression formula of BER, the upper limit expression formula of BER is defined；The SQM optimization problems minimized based on the BER upper limits are established, optimization object function and corresponding constraints are provided, to obtain the NSQM modes for being 4 based on transmitting terminal LED numbers；Based under NSQM modes, 4 system mapping signal collection are designed, the design cycle of 8 system mapping signal collection is provided, provides the mentality of designing of 16 system mapping signal collection, finally, 64 system mapping signals integrate being superimposed as 4-NSQM and 16-NSQM.Such method sends the mapping mode of optical signal by optimization, improves the transmission reliability of visible light signal.

Description

A kind of novel orthogonal space modulator approach based on indoor visible light communication
Technical field
The present invention relates to a kind of modulator approaches of visible light signal in scene of visible light communication indoors, more particularly to a kind of Novel orthogonal space modulator approach based on indoor visible light communication.
Background technology
Visible light communication (VLC) is concerned because of it in efficiency and the significant advantage of indoor wireless communication etc., Basic principle：Originator sends information data using light emitting diode (LED), and signal reaches receiving terminal after optical channel transmits, and receives Optical signal is directly detected using photodiode (PD) detector at end.It is to be noted, however, that：Based on VLC systems The unipolarity feature of middle signal, presence signal is using intensity modulated/directly detect this restricted problem.Thus, on overcoming State challenge, so realize information transmission it is efficient with it is reliable, spatial modulation (SM), M-ary orthogonal amplitude modulation (M-QAM) and The technologies such as orthogonal space modulation (SQM) have become the important research content in VLC modulation techniques.
The basic principle of SQM technologies is：M-QAM signals are converted to and meets VLC systems signal " real, just " characteristic is wanted It asks, and LED serial numbers is sent to activate to send signal, information data is sent through LED；Receiving terminal is based on maximum-likelihood criterion right It sends optical signal to carry out in estimation procedure, needs the estimation for considering the activated LED serial numbers of originator.Therefore, visible light is logical indoors Believe in scene, be based on the basis of SQM how to optimize the mapping mode for sending optical signal, and then realizes visible light signal transmission High efficient and reliable is always the research emphasis of experts and scholars.
In order to obtain suitable for indoor visible light communication high efficient and reliable modulation system, this case comes into being.
Invention content
The purpose of the present invention is to provide a kind of novel orthogonal space modulator approach based on indoor visible light communication, The mapping mode that optical signal is sent by optimization, improves the transmission reliability of visible light signal.
In order to achieve the above objectives, solution of the invention is：
A kind of novel orthogonal space modulator approach based on indoor visible light communication, includes the following steps：
Step A is based on SQM schemes, according to maximal possibility estimation criterion, under conditions of not considering activated LED serial numbers, Provide estimated expression of the demodulator to transmission signal；
Step B provides the SER expression formulas under SQM modes using PEP and UB technologies；
Step C provides the BER expression formulas under SQM modes according to SER expression formulas by analyzing the characteristics of sending signal；
Step D defines the upper limit expression formula of BER according to the expression formula of BER；
Step E establishes the SQM optimization problems minimized based on the BER upper limits, provides optimization object function and corresponding constraint item Part, to obtain being based on transmitting terminal LED number Nst=4 NSQM modes；
Step F designs 4 system mapping signal collection based under NSQM modes；
Step G provides the design cycle of 8 system mapping signal collection based under NSQM modes；
Step H provides the mentality of designing of 16 system mapping signal collection based under NSQM modes；
Step I, based under NSQM modes, 64 system mapping signals integrate being superimposed as 4-NSQM and 16-NSQM.
Above-mentioned steps B's comprises the concrete steps that：
Step B1, using PEP and UB technologies, providing initial SER expression formulas is： Wherein P (sm→sk) indicate：Transmission symbol is smWhen, and it is symbol s to adjudicatekCorresponding PEP；Modulation symbol number is M；
Step B2 has based under the conditions of visible light channel characteristic H：P(sm→sk| H)=P (D (y, sk)>D(y,sm) | H), Wherein D (y, sm) it is y and smBetween Euclidean distance, be defined as：Yl indicates first of PD detection The optical signal arrived, NrIndicate the number of receiving terminal PD, HlIndicate the l rows of H；
Step B3 obtains SER expression formulas：
Whereinσ2For the variance of Gaussian noise in visible light channel, ρ is the average hair of each symbol It is the responsiveness of photoelectric detector to send luminous power, γ.
Above-mentioned steps F's comprises the concrete steps that：
Step F1, according to SQM modes, the 4 binary signal collection of NSQM are defined as：
Step F2 is not considering HlUnder conditions of influence, all Euclidean distance forms that may be present are provided：
Step F3, according to optimization object function and corresponding constraints, in α=1 and β=0, after being optimized Be possible to Euclidean distance is：
Step F4, the 4 binary signal collection for obtaining NSQM are：
Above-mentioned steps G's comprises the concrete steps that：
Step G1,8 system NSQM signal collection are denoted as：
And it defines η=α/β；
Step G2 is not considering HlUnder conditions of influence, all Euclidean distances that may be present are provided：
The formula is related to η；
Step G3 optimizes factor η according to optimization object function and corresponding constraints by calculatingoptRealize modulation Optimization design.
Above-mentioned steps H's comprises the concrete steps that：
Step H1 provides two 4 system NSQM signal collection：
Define η=α/β；
Step H2,16 system NSQM signal collection are：Signal operation is the superposition fortune of plural number It calculates；
Step H3 optimizes factor η according to optimization object function and corresponding constraints by calculatingoptRealize modulation Optimization design.
After adopting the above scheme, the present invention transmits BER high for existing SQM modes presence signal in indoor visible light communication The problem of, compared to existing SQM technologies, the present invention gives under conditions of not considering activated LED serial numbers estimation based on most The signal estimated expression of the Nature criterion, and emphasis establishes the optimization problem of error upper limit minimum based on SQM modes, provides Optimization object function and constraints further devise the signal mapping mode of multi-system NSQM, effectively improve signal The BER performances of transmission, improve the information transmission quality under indoor visible light communication scene, and the present invention is suitable for indoor visible light User node in communication.
Description of the drawings
Fig. 1 is that 4-NSQM and 8-NSQM and the performance of BER of existing 4-SQM and 8-SQM proposed by the invention are compared Curve graph；
Fig. 2 is the performance of BER of 16-NSQM and 64-NSQM and existing 16-SQM and 64-SQM proposed by the invention Contrast curve.
Specific implementation mode
Below with reference to attached drawing, technical scheme of the present invention and advantageous effect are described in detail.
The present invention provides a kind of novel orthogonal space modulator approach based on indoor visible light communication, includes the following steps：
Step A)：Do not considering institute according to maximal possibility estimation criterion based on existing space orthogonal modulation (SQM) scheme Under conditions of activating LED serial numbers, estimated expression of the demodulator to transmission signal is provided；
Step B)：Using pair-wise error probability (PEP) and uniform bound (UB) technology, the error sign ratio under SQM modes is provided (SER) expression formula；
Step C)：According to SER expression formulas the bit error rate under SQM modes is provided by analyzing the characteristics of sending signal (BER) expression formula；
Step D)：According to the expression formula of BER, the upper limit expression formula of BER is defined；
Step E)：The SQM optimization problems minimized based on the BER upper limits are established, optimization object function and corresponding constraint are provided Condition, to obtain being based on transmitting terminal LED number Nst=4 novel orthogonal space modulates (NSQM) mode；
Step F)：Based under NSQM modes, 4 system mapping signal collection are designed；
Step G)：Based on the design cycle under NSQM modes, providing 8 system mapping signal collection.
Step H)：Based on the mentality of designing under NSQM modes, providing 16 system mapping signal collection.
Step I)：Based under NSQM modes, 64 system mapping signals integrate being superimposed as 4-NSQM and 16-NSQM.
Wherein, the step B is comprised the concrete steps that：
Step B1)：Using PEP and UB technologies, providing initial SER expression formulas is：
Wherein P (sm→sk) indicate：Transmission symbol is smWhen, and it is symbol s to adjudicatek Corresponding PEP；Modulation symbol number is M；
Step B2)：Under the conditions of visible light channel characteristic H, have：P(sm→sk| H)=P (D (y, sk)>D(y,sm)| H), wherein D (y, sm) it is y and smBetween Euclidean distance, be defined as：Yl indicates first of PD inspection The optical signal measured, NrIndicate the number of receiving terminal PD, HlIndicate the l rows of H；
Step B3)：Obtain SER expression formulas：Whereinσ2For the variance of Gaussian noise in visible light channel, ρ is the average transmission light work(of each symbol Rate, γ are the responsiveness of photoelectric detector.
The step F's comprises the concrete steps that：
Step F1)：According to SQM modes, the 4 binary signal collection of NSQM are defined as：
Step F2)：Do not considering HlUnder conditions of influence, all Euclidean distance forms that may be present are provided：
Step F3)：According to optimization object function and corresponding constraints, in α=1 and β=0, after obtaining optimization Be possible to Euclidean distance be：
Step F4)：The 4 binary signal collection for obtaining NSQM are：
The step G's comprises the concrete steps that：
Step G1)：8 system NSQM signals collection can be denoted as：
And it defines η=α/β；
Step G2)：Do not considering HlUnder conditions of influence, all Euclidean distances that may be present are provided：
The formula is related to η；
Step G3)：According to optimization object function and corresponding constraints, factor η can be optimized by calculatingoptIt realizes and adjusts The optimization design of system.
The step H's comprises the concrete steps that：
Step H1)：Provide two 4 system NSQM signal collection：
Define η=α/β
Step H2)：16 system NSQM signal collection are：Signal operation is the superposition fortune of plural number It calculates.
Step H3)：According to optimization object function and corresponding constraints, factor η can be optimized by calculatingoptIt realizes and adjusts The optimization design of system.
In summary, a kind of novel orthogonal space modulator approach based on indoor visible light communication of the present invention, for visible Signal characteristic is transmitted in optic communication, under conditions of omitting activated LED serial numbers estimation, by analyzing the errored bit under SQM modes Rate performance establishes the optimization problem of error upper limit minimum, provides the object function and constraints of optimization, to sending The projected forms of signal optimize, and give the multi-system signal projected forms of NSQM modes, improve the mistake of information transmission Bit-rate performance.It will be seen from figure 1 that under certain simulation parameter, the bit error rate 10-4When, the 4-NSQM and 8- that are proposed NSQM schemes are compared to existing corresponding SQM schemes, and there are about the performance gains of 4.5dB and 1.5dB respectively；Figure it is seen that Under certain simulation parameter, the bit error rate 10-5When, the 16-NSQM proposed is corresponding compared to existing with 64-NSQM schemes SQM schemes, there are about the performance gains of 2.3dB and 1.0dB respectively；In addition, can be obtained from Fig. 1 and Fig. 2：In high s/n ratio condition Under, it can be with the error upper limit derived come the corresponding performance of BER of accurate description.
Above example is merely illustrative of the invention's technical idea, and protection scope of the present invention cannot be limited with this, every According to technological thought proposed by the present invention, any change done on the basis of technical solution each falls within the scope of the present invention Within.

Claims (5)

1. a kind of novel orthogonal space modulator approach based on indoor visible light communication, it is characterised in that include the following steps：
Step A is based on SQM schemes, is provided under conditions of not considering activated LED serial numbers according to maximal possibility estimation criterion Estimated expression of the demodulator to transmission signal；
Step B provides the SER expression formulas under SQM modes using PEP and UB technologies；
Step C provides the BER expression formulas under SQM modes according to SER expression formulas；
Step D defines the upper limit expression formula of BER according to the expression formula of BER；
Step E establishes the SQM optimization problems minimized based on the BER upper limits, provides optimization object function and corresponding constraints, To obtain being based on transmitting terminal LED number Nst=4 NSQM modes；
Step F designs 4 system mapping signal collection based under NSQM modes；
Step G provides the design cycle of 8 system mapping signal collection based under NSQM modes；
Step H provides the mentality of designing of 16 system mapping signal collection based under NSQM modes；
Step I, based under NSQM modes, 64 system mapping signals integrate being superimposed as 4-NSQM and 16-NSQM.
2. a kind of novel orthogonal space modulator approach based on indoor visible light communication as described in claim 1, feature exist In：The step B's comprises the concrete steps that：
Step B1, using PEP and UB technologies, providing initial SER expression formulas is：Wherein P (sm→sk) indicate：Transmission symbol is smWhen, and it is symbol s to adjudicatekCorresponding PEP；Modulation symbol number is M；
Step B2 has based under the conditions of visible light channel characteristic H：P(sm→sk| H)=P (D (y, sk)>D(y,sm) | H), wherein D (y,sm) it is y and smBetween Euclidean distance, be defined as：ylIndicate the light that first of PD is detected Signal, NrIndicate the number of receiving terminal PD, HlIndicate the l rows of H；
Step B3 obtains SER expression formulas：
Whereinσ2For the variance of Gaussian noise in visible light channel, ρ is the average hair of each symbol It is the responsiveness of photoelectric detector to send luminous power, γ.
3. a kind of novel orthogonal space modulator approach based on indoor visible light communication as described in claim 1, feature exist In：The step F's comprises the concrete steps that：
Step F1, according to SQM modes, the 4 binary signal collection of NSQM are defined as：
Step F2 is not considering HlUnder conditions of influence, all Euclidean distance forms that may be present are provided：
Step F3, it is all after being optimized in α=1 and β=0 according to optimization object function and corresponding constraints Possible Euclidean distance is：
Step F4, the 4 binary signal collection for obtaining NSQM are：
4. a kind of novel orthogonal space modulator approach based on indoor visible light communication as described in claim 1, feature exist In：The step G's comprises the concrete steps that：
Step G1,8 system NSQM signal collection are denoted as：
And define η=α/ β；
Step G2 is not considering HlUnder conditions of influence, all Euclidean distances that may be present are provided：
The formula is related to η；
Step G3 optimizes factor η according to optimization object function and corresponding constraints by calculatingoptRealize the optimization of modulation Design.
5. a kind of novel orthogonal space modulator approach based on indoor visible light communication as described in claim 1, feature exist In：The step H's comprises the concrete steps that：
Step H1 provides two 4 system NSQM signal collection：
Define η=α/β；
Step H2,16 system NSQM signal collection are：Signal operation is the superposition of plural number；
Step H3 optimizes factor η according to optimization object function and corresponding constraints by calculatingoptRealize the optimization of modulation Design.
CN201810390495.1A 2018-04-27 2018-04-27 Novel space orthogonal modulation method based on indoor visible light communication Expired - Fee Related CN108809885B (en)

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Citations (5)

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Publication number Priority date Publication date Assignee Title
US20130279919A1 (en) * 2008-10-17 2013-10-24 Samsung Electronics Co., Ltd. Visible-light communication system and method
CN103840886A (en) * 2014-01-24 2014-06-04 清华大学 Precoding method based on multiple light sources in visible light communication
CN104243033A (en) * 2014-09-15 2014-12-24 东南大学 Spatial modulation transmitting method suitable for visible light communication
CN105517153A (en) * 2015-12-22 2016-04-20 北京邮电大学 Channel control method and device in indoor visible light communication
CN105991508A (en) * 2016-05-13 2016-10-05 深圳市统先科技股份有限公司 8QAM modulation method and system thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130279919A1 (en) * 2008-10-17 2013-10-24 Samsung Electronics Co., Ltd. Visible-light communication system and method
CN103840886A (en) * 2014-01-24 2014-06-04 清华大学 Precoding method based on multiple light sources in visible light communication
CN104243033A (en) * 2014-09-15 2014-12-24 东南大学 Spatial modulation transmitting method suitable for visible light communication
CN105517153A (en) * 2015-12-22 2016-04-20 北京邮电大学 Channel control method and device in indoor visible light communication
CN105991508A (en) * 2016-05-13 2016-10-05 深圳市统先科技股份有限公司 8QAM modulation method and system thereof

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