CN107547133A - The PLC VLC transmission methods based on OFDM technology for indoor communication system - Google Patents
The PLC VLC transmission methods based on OFDM technology for indoor communication system Download PDFInfo
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Abstract
The present invention relates to a kind of PLC VLC transmission methods based on OFDM technology for indoor communication system, including step：S1：The signal damaged by PLC channels, noise is further transmitted after OFDM demodulation；S2：Ofdm signal from PLC is mapped in VLC ofdm signals with deinterleaving method；S3：While communication and lighting requirement is met, the signal of mapping is adjusted and transmitted in VLC systems；S4：Receiver receives and reconstruction signal is to recover primary signal.Compared with prior art, PLC and VLC supports high data rate transfer using OFDM technology in indoor communications in the present invention program, information data is passed through after PLC channels first, signal is damaged by noise, sent by PLC after OFDM demodulation, be then mapped to the ofdm signal from PLC in VLC ofdm signals with deinterleaving method.
Description
Technical field
The present invention relates to a kind of visible light communication technology, more particularly, to it is a kind of for indoor communication system based on OFDM
The PLC-VLC transmission methods of technology.
Background technology
Because visible light communication (VLC) has large bandwidth and the frequency spectrum do not modulated, the transmission of high data rate, do not have
The advantages of electromagnetic interference and high security so that VLC is more and more paid close attention to by researchers.
In the VLC systems based on intensity modulated/direct detection (IM/DD), only non-negative signal can pass through luminous intensity
To modulate.Researchers develop substantial amounts of intensity modulated, such as on-off keying (OOK), pulse position in IM/DD VLC systems
Put modulation (PPM) and gamut keying (CSK).However, these modulation schemes can not realize high bandwidth efficiency or easily be done by intersymbol
Disturb the influence of (ISI).In order to make up these shortcomings, warp-wise VLC systems introduce such as direct current offset to some researchers
OFDM (DCO-OFDM) and the OFDM of asymmetric amplitude limit light OFDM (ACO-OFDM).
Recently, the white light LEDs being made up of polychrome chip, i.e., red, green and blue chip (RGB-LED) or red are green
Color, blueness and amber color chip (RGBA-LED), because it has high modulation bandwidth so that it turns into promising in VLC systems
Emitter.There is researcher by using the modulation based on color space, OFDM technology has been applied to based on RGB-LED's
VLC systems.Further, since white light LEDs are made up of polychrome chip, the mixing of different colours can cause polychrome interactive, i.e. crosstalk.Together
When in view of the requirement that illuminates and communicate, nowadays, in the application of VLC systems introducing RGBA-LED is used as transmitter and receiver.
However, VLC must access the backbone network with extensive in-door covering and can just ensure for current technology
Good communication.Because all LED are all connected to the power line in indoor VLC systems, therefore it is using power line as trunk
Naturally.In such a case, the bandwidth of power line communication (PLC) can reach 30MHz, fast and reliable so as to support
Communication.At present, the integrated PLC/VLC systems of many literature research.Researchers first proposed an integrated PLC/VLC
System and the bit error rate (BER) for analyzing binary modulation schemes, then they further analyze arrowband OFDM in PLC/VLC
The performance of system.Dived because the advantage of relaying and multiple-input and multiple-output (MIMO) causes it as what is realized in PLC/VLC systems
In technology.In PLC/VLC systems, the ofdm signal in PLC is broken when by PLC passages by ambient noise and impulsive noise
Crosstalk that is bad, and being triggered in VLC systems during transmission by multi-color signal, limit the systematic function of higher order modulation schemes.Cause
This, we by using OFDM technology and using RGBA-LED as VLC in information transmitter integrated PLC/VLC is presented
System, and the bit error rate under different impulse noise effects is analyzed, to obtain more preferable transmission performance.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind is used for indoor communications
The PLC-VLC transmission methods based on OFDM technology of system.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of PLC-VLC transmission methods based on OFDM technology for indoor communication system, including step：
S1：The signal damaged by PLC channels, noise is further transmitted after OFDM demodulation；
S2：Ofdm signal from PLC is mapped in VLC ofdm signals with deinterleaving method；
S3：While communication and lighting requirement is met, the signal of mapping is adjusted and transmitted in VLC systems；
S4：Receiver receives and reconstruction signal is to recover primary signal.
The step S2 specifically includes step：
S21：Set the number of the subcarrier for PLC and VLC OFDM：
AN=b (M-2)
Wherein：A is PLC data number, and b is VLC OFDM data numbers, and N is PLC OFDM number of sub carrier wave, and M is
The number of VLC OFDM subcarrier；
S22：Odd subcarriers are mapped in a VLC ofdm signal, and even subcarriers are then mapped to and had
In another VLC ofdm signal of Hermitian symmetric properties.
The data number of the PLC and the data number of VLC OFDM data numbers are 1.
The VLC systems are the VLC systems of the white light LEDs of RGBA-LED compositions,
The step S3 specifically includes step：
S31：IFFT modes are performed to VLC ofdm signals and modulate isolated two unipolar signals：
xi=max (x, 0) and xj=-min (x, 0),
Wherein：I, j ∈ { R, G, B, A }, represent that RGBA-LED's is color-coded；
S32：The unipolar signal of separation is adjusted by bias operation after shearing；
S33：According to setting colour mixture ratio, by four kinds of blend of colors together to produce white light, four kinds of letters after separation adjustment
Number transmitted through RGBA-LED in VLC channels.
The step S31 is specially：Parallel/serial row conversion and cyclic prefix addition are performed to VLC ofdm signals, will be bipolar
Discrete time signal is separated into two unipolar signals.
In VLC systems, maximum I is not to be exceeded in the instantaneous strength of each colormax。
The step S4 specifically includes step：
S41：The signal of each color is received, wherein, the reception signal of the i-th tunnel color is：
Wherein：yiFor the reception signal of the i-th tunnel color, gi,iFor the light front-end gain of the i-th road signal, hiFor the sound of optical channel
Should,For the transmission signal of the i-th tunnel color, gi,jFor transmitting terminal LED j-th of color signal and i-th of color signal of receiving terminal
Crosstalk, hjFor the response of optical channel,For the transmission signal of jth road color, niIt is 0 for average, variance isAdditivity it is high
This white noise, wiFor interference；
S42：Carry out cyclic prefix removal, serial/parallel row conversion and FFT demodulation operations successively to reception signal；
S43：Zero forcing equalizer is performed to eliminate the intersymbol interference in received VLC signals, wherein believing for the i-th road
Number, the output of balanced device is：
Wherein：For the output of balanced device, YiAnd XiFor yiAnd xiFrequency-region signal, HiFor domain channel response, WiAnd NiPoint
Wei not wiAnd niFrequency domain representation；
S44：The signal of the separation two from identical data is reconstructed in a frequency domain：
S45：Demapping carried out to the signal of reconstruct according to deinterleaving method, then detection signal recovers raw information number
According to.
Compared with prior art, the present invention has advantages below：
1) PLC and VLC supports high data rate transfer using OFDM technology in indoor communications in the present invention program, first
Information data is passed through after PLC channels, and signal is damaged by noise, is sent after OFDM demodulation by PLC, then by from PLC's
Ofdm signal is mapped in VLC ofdm signals with deinterleaving method.
2) the inventive method is used by red, green while communication and lighting requirement is met to the signal of mapping, blue
Adjustment and transmission in the VLC systems of the white light LEDs of color and amber LED chip (RGBA-LED) composition.Using power line as
Trunk, by VLC system access to the backbone network with extensive in-door covering.In such a case, the band of power line communication (PLC)
Width can reach 30MHz, so as to support fast and reliable communication.
3) Hermitian symmetrical mappings and Signal separator are incorporated into OFDM by the inventive method in PLC and VLC systems
In, to ensure that time-domain signal is non-negative.Then, while lighting requirement is ensured, to bias (BAC) after OFDM exploitation shearings
Operation.The present invention is due to take into account impulsive noise and OFDM modulation in PLC passages simultaneously, so this method is closer to reality
Border system, with more the directive significance of reality.
Brief description of the drawings
Fig. 1 is the key step schematic flow sheet of the inventive method；
Fig. 2 is the FB(flow block) of the present invention；
Fig. 3 is in the embodiment of the present invention, different under additive white Gaussian noise and impulsive noise in indoor visible light communication
Modulation and the ber curve figure of different signal to noise ratio.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
A kind of PLC-VLC transmission methods based on OFDM technology for indoor communication system, as Fig. 1 and Fig. 2 includes step
Suddenly：
S1：Information data is sent by PLC first, in the signal damaged by PLC channels, noise through OFDM demodulation laggard one
Step transmission；
S2：Modulated and transmission signal, will be mapped to from PLC ofdm signal with deinterleaving method using light OFDM technology
In VLC ofdm signals, step is specifically included：
S21：For the ease of mapping, the number of the subcarrier for PLC and VLC OFDM should be properly selected, that is, is set
Number for PLC and VLC OFDM subcarrier：
AN=b (M-2)
Wherein：A is PLC data number, and b is VLC OFDM data numbers, and N is PLC OFDM number of sub carrier wave, and M is
The number of VLC OFDM subcarrier；
Data number is the data amount check to be transmitted, and plurality of data can pass through OFDM modulation and become an OFDM letter
Number.When being modulated using OFDM, it is necessary to use multiple subcarrier-modulateds, N number of subcarrier is modulated here, obtains one
PLC ofdm signals, M subcarrier is modulated, obtains a VLC ofdm signal.
S22：When PLC data number and the data number of VLC OFDM data numbers are 1, a PLC OFDM letter
Number it is mapped to deinterleaving method in two VLC ofdm signals, in the mapping that interweaves at this, odd subcarriers are mapped to a VLC
In ofdm signal, and even subcarriers are then mapped in another VLC ofdm signal with Hermitian symmetric properties；
S3：While communication and lighting requirement is met, the signal of mapping is adjusted and transmitted, VLC systems in VLC systems
For the VLC systems of the white light LEDs of RGBA-LED compositions, step is specifically included：
S31：After signal mapping,：Parallel/serial row conversion and cyclic prefix (CP) addition are performed to VLC ofdm signals,
Bipolar discrete time signal is separated into two unipolar signals：
xi=max (x, 0) and xj=-min (x, 0),
Wherein：I, j ∈ { R, G, B, A }, represent that RGBA-LED's is color-coded；
In RGBA-LED, to ensure LED operation in linear scope, maximum is not to be exceeded in the instantaneous strength of each color
Value Imax。
S32：The unipolar signal of separation is adjusted by biasing (BAC) operation after shearing, signal is after BAC is operated：Wherein λi=Imax-βi, βiFor bias factor.
S33：According to setting colour mixture ratio (CMR), by four kinds of blend of colors together to produce white light, four after adjustment are separated
Kind signal transmits through RGBA-LED in VLC channels.
S4：Receiver receives and reconstruction signal is to recover primary signal, specifically includes step：
S41：The signal of each color is received, wherein, the reception signal of the i-th tunnel color is：
Wherein：yiFor the reception signal of the i-th tunnel color, gi,iFor the light front-end gain of the i-th road signal, hiFor the sound of optical channel
Should,For the transmission signal of the i-th tunnel color, gi,jFor transmitting terminal LED j-th of color signal and i-th of color signal of receiving terminal
Crosstalk, hjFor the response of optical channel,For the transmission signal of jth road color, niIt is 0 for average, variance isAdditivity it is high
This white noise, wiFor interference；
S42：Carry out cyclic prefix removal, serial/parallel row conversion and FFT demodulation operations successively to reception signal；
S43：ZF (ZF) balanced device is performed to eliminate the intersymbol interference (ISI) in received VLC signals, wherein right
In the i-th road signal, the output of balanced device is：
Wherein：For the output of balanced device, YiAnd XiFor yiAnd xiFrequency-region signal, HiFor domain channel response, WiAnd NiPoint
Wei not wiAnd niFrequency domain representation；
S44：The signal of the separation two from identical data is reconstructed in a frequency domain：I, j ∈ { R, G, B, A } table
Show the mark from two signals of data stream separation, due to FFT linear characteristic, therefore reconstructed operation performs in a frequency domain, etc.
Imitate in reconstructed operation in the time domain；
S45：Demapping carried out to the complex signal Y of reconstruct according to deinterleaving method, then detection signal recovers original letter
Cease data.
The solution of the present invention, first, information data are sent by PLC.Modulate signals into, then perform IFFT operations, it is parallel/serial
Row conversion and cyclic prefix (CP) addition, after by PLC channels, the signal of noise damage further passes after OFDM demodulation
It is defeated.Secondly the ofdm signal from PLC is mapped in VLC ofdm signals with deinterleaving method, is meeting communication and lighting requirement
While, the signal of mapping is by red, green, the white light LEDs that blue and amber LED chip (RGBA-LED) forms
Adjust and transmit in VLC systems.After signal mapping, IFFT operations are performed to VLC ofdm signals, parallel/serial row is changed and followed
Ring prefix (CP) is added.Then, bipolar discrete time signal is separated into two unipolar signals.By being biased after shearing
(BAC) operate to adjust the signal of separation.Again, according to the specific colour mixture ratio (CMR) of four kinds of colors for producing illumination light
By four kinds of blend of colors together to produce white light, four kinds of signals after separation adjustment transmit through RGBA-LED in VLC channels.
Finally, receiver receives and reconstruction signal is to recover primary signal.
The present invention program is illustrated with a concrete case below.
Using the transmission plan of the present invention, wherein N=1024, CR=10dB, for the impulsive noise in PLC passages, K=
3, a=0.01, Γ=0.1, and for the crosstalk in VLC passages, ξ=0.06.
Using the transmission plan of the present invention, using different modulation schemes, under different interference ratios, it is respectively
The error rate test of system.For test result as shown in figure 3, in Fig. 3, abscissa represents the signal to noise ratio of communication system, unit：dB；It is vertical
The coordinate representation bit error rate.
We show the BER performances of different modulation schemes in Fig. 3.In Fig. 3, the implication that every curve represents is respectively：Band
Criss-cross solid-line curve represents to modulate using 4QAM, the bit error rate of difference signal to noise ratio during ξ=0；Represented with criss-cross imaginary curve
Modulated using 4QAM, the bit error rate of difference signal to noise ratio during ξ=0.06；Solid-line curve with open circles represents to modulate using 16QAM, ξ
The bit error rate of difference signal to noise ratio when=0；Imaginary curve with open circles represents to modulate using 16QAM, difference signal to noise ratio during ξ=0.06
The bit error rate；Solid-line curve with equilateral triangle represents 64QAM modulation, the bit error rate of difference signal to noise ratio during ξ=0；Band equilateral triangle
Imaginary curve represent 64QAM modulation, the bit error rate of difference signal to noise ratio during ξ=0.06.Impulsive noise it can be seen from from by Fig. 3
The serious systematic function for reducing different modulation schemes.For example, for each modulation scheme, the performance as caused by impulsive noise is damaged
Fail to keep an appointment as 20dB.On the other hand, the systematic function under crosstalk penalty under VLC channels awgn channel, and with pulse
The deterioration can be ignored under the channel of noise.It is therefore found that branch of the integrated PLC/VLC systematic functions by impulsive noise
Match somebody with somebody, and 64QAM performance has smaller error under the VLC channels with crosstalk.In indoor communication system proposed by the present invention
Using the PLC/VLC of OFDM technology transmission plan, more preferable transmission performance can be obtained.
Claims (7)
1. a kind of PLC-VLC transmission methods based on OFDM technology for indoor communication system, it is characterised in that including step
Suddenly：
S1：The signal damaged by PLC channels, noise is further transmitted after OFDM demodulation；
S2：Ofdm signal from PLC is mapped in VLC ofdm signals with deinterleaving method；
S3：While communication and lighting requirement is met, the signal of mapping is adjusted and transmitted in VLC systems；
S4：Receiver receives and reconstruction signal is to recover primary signal.
2. a kind of PLC-VLC transmission methods based on OFDM technology for indoor communication system according to claim 1,
Characterized in that, the step S2 specifically includes step：
S21：Set the number of the subcarrier for PLC and VLC OFDM：
AN=b (M-2)
Wherein：A is PLC data number, and b is VLC OFDM data numbers, and N is PLC OFDM number of sub carrier wave, M VLC
The number of OFDM subcarrier；
S22：Odd subcarriers are mapped in a VLC ofdm signal, and even subcarriers are then mapped to and had
In another VLC ofdm signal of Hermitian symmetric properties.
3. a kind of PLC-VLC transmission methods based on OFDM technology for indoor communication system according to claim 2,
Characterized in that, the data number of the PLC and the data number of VLC OFDM data numbers are 1.
4. a kind of PLC-VLC transmission methods based on OFDM technology for indoor communication system according to claim 1,
Characterized in that, the VLC systems are the VLC systems of the white light LEDs of RGBA-LED compositions,
The step S3 specifically includes step：
S31：IFFT modes are performed to VLC ofdm signals and modulate isolated two unipolar signals：
xi=max (x, 0) and xj=-min (x, 0),
Wherein：I, j ∈ { R, G, B, A }, represent that RGBA-LED's is color-coded；
S32：The unipolar signal of separation is adjusted by bias operation after shearing；
S33：According to setting colour mixture ratio, by four kinds of blend of colors together to produce white light, four kinds of signals warp after separation adjustment
RGBA-LED is transmitted in VLC channels.
5. a kind of PLC-VLC transmission methods based on OFDM technology for indoor communication system according to claim 4,
Characterized in that, the step S31 is specially：Parallel/serial row conversion and cyclic prefix addition are performed to VLC ofdm signals, will be double
Pole discrete time signal is separated into two unipolar signals.
6. a kind of PLC-VLC transmission methods based on OFDM technology for indoor communication system according to claim 4,
Characterized in that, in VLC systems, maximum I is not to be exceeded in the instantaneous strength of each colormax。
7. a kind of PLC-VLC transmission methods based on OFDM technology for indoor communication system according to claim 4,
Characterized in that, the step S4 specifically includes step：
S41：The signal of each color is received, wherein, the reception signal of the i-th tunnel color is：
Wherein：yiFor the reception signal of the i-th tunnel color, gi,iFor the light front-end gain of the i-th road signal, hiFor the response of optical channel,For the transmission signal of the i-th tunnel color, gi,jFor transmitting terminal LED j-th of color signal and i-th of color signal of receiving terminal
Crosstalk, hjFor the response of optical channel,For the transmission signal of jth road color, niIt is 0 for average, variance isAdditive Gaussian
White noise, wiFor interference；
S42：Carry out cyclic prefix removal, serial/parallel row conversion and FFT demodulation operations successively to reception signal；
S43：Zero forcing equalizer is performed to eliminate the intersymbol interference in received VLC signals, wherein for the i-th road signal,
The output of balanced device is：
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Wherein：For the output of balanced device, YiAnd XiFor yiAnd xiFrequency-region signal, HiFor domain channel response, WiAnd NiRespectively
wiAnd niFrequency domain representation；
S44：The signal of the separation two from identical data is reconstructed in a frequency domain：
S45：Demapping carried out to the signal of reconstruct according to deinterleaving method, then detection signal recovers original information data.
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| CN111697999A (en) * | 2020-06-05 | 2020-09-22 | 重庆邮电大学 | Combined user pairing and subcarrier allocation scheme for hybrid PLC/VLC system |
| CN114285470A (en) * | 2021-12-13 | 2022-04-05 | 中国农业大学 | Visible light communication method and device |
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