CN206977428U - It can be seen that light wireless communication physical layer optical frequency modulator - Google Patents
It can be seen that light wireless communication physical layer optical frequency modulator Download PDFInfo
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- CN206977428U CN206977428U CN201720715670.0U CN201720715670U CN206977428U CN 206977428 U CN206977428 U CN 206977428U CN 201720715670 U CN201720715670 U CN 201720715670U CN 206977428 U CN206977428 U CN 206977428U
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Abstract
The utility model provides a kind of visible light wireless communication physical layer optical frequency modulator, including：Baseband modulator；D/A converting circuit；Signal gain and bias control circuit；Low pass filter；Pre equalizer；Add and circuit；Transconductance driver；Light emitting diode matrix.The input and the input of signal gain and bias control circuit of the output end connection D/A converting circuit of baseband modulator, the output end connection signal gain of D/A converting circuit and the input of bias control circuit, signal gain and the output end of bias control circuit connect respectively low pass filter and add and circuit input, the input of the output end connection pre equalizer of low pass filter, the output end connection of pre equalizer plus the input with circuit, add the input that transconductance driver is connected with the output end of circuit, the input of the output end connecting luminous diode array of transconductance driver.The utility model realizes that the hardware modulated process of baseband digital signal to optical frequency signal enables signal to succeed in sending up.
Description
Technical field
It the utility model is related to wireless light communication field, and in particular to visible light wireless communication physical layer optical frequency modulator.
Background technology
In the society of current advanced IT application, as the main flow of modern society, radio communication is communication for information and communication
A more important part in field.Traditional communication is communicated using microwave, and its bandwidth gradually can not
Meet increasingly huge communication requirement, and caused Radiation On Human body health has certain injury.So people need one kind more
Safety, more healthy, faster communication, then, it is thought that visible light communication.And based on the wireless of visible ray
In communication system, the modulation of signal is an indispensable part, former using radio communication based on this theory, the utility model
Reason, realizes a kind of visible light wireless communication physical layer optical frequency modulator.
The content of the invention
The purpose of this utility model is to provide a kind of visible light wireless communication physical layer optical frequency modulator.
The technical solution of the utility model is：
It can be seen that light wireless communication physical layer optical frequency modulator, including：
By baseband modulator of the local data modulation conversion into subcarrier numeral signal output to D/A converting circuit；
Subcarrier data signal is converted to the D/A converting circuit of subcarrier imitating voltage signal；
Gain amplification is carried out to subcarrier imitating voltage signal and exports signal gain and the biasing of the voltage signal of biasing
Control circuit；
Lift the low pass filter of the subcarrier imitating voltage signal signal to noise ratio of variable gain amplifier output；
Resist the pre equalizer of the photoelectric distortion of subcarrier imitating voltage signal of low pass filter output；
The voltage signal of biasing is produced to offset controller and the subcarrier imitating voltage signal of pre equalizer output is carried out
Add sum plus and circuit；
It will add and be converted into subcarrier imitating current signal driving luminous two with the subcarrier imitating voltage signal of circuit output
The transconductance driver of pole pipe array；
The light emitting diode matrix of optical frequency modulation will be completed on subcarrier imitating current signal modulation to visible frequency.
The input of the output end connection D/A converting circuit of baseband modulator, the output end connection letter of D/A converting circuit
The output end of number gain and the input of bias control circuit, signal gain and bias control circuit connects low pass filter respectively
Input and plus and circuit input, the output end connection of low pass filter and pre equalizer plus and circuit input,
Add the input that transconductance driver is connected with the output end of circuit, the output end connecting luminous diode array of transconductance driver
Input.
The baseband modulator is digital into subcarrier by local data modulation conversion by the way of DFTS-OFDM modulation
Signal.
The D/A converting circuit, including：
Subcarrier data signal is converted to the digital analog converter of subcarrier imitating current signal；
Subcarrier imitating current signal is converted into the transreactance amplifier of subcarrier imitating voltage signal；
The output end of the input connection baseband modulator of digital analog converter, the output end connection mutual resistance of digital analog converter are put
The input of big device, the output end connection signal gain of transreactance amplifier and the input of bias control circuit.
The signal gain and bias control circuit, including：
The controller firmware of the signal gain of variable gain amplifier and the signal biasing of offset controller is set；
The subcarrier imitating voltage signal that the signal gain logarithm analog conversion circuit set according to controller firmware exports enters
The variable gain amplifier of row gain amplification；
The offset controller that the signal biasing set according to controller firmware produces the voltage signal of biasing and exported；
The output end of controller firmware connects the input of variable gain amplifier and the input of offset controller respectively,
The input of variable gain amplifier is also connected with the output end of D/A converting circuit, the output end connection of offset controller plus and electricity
The input on road, the output end connection low pass filter of variable gain amplifier and the input of pre equalizer, low pass filter
Be connected with the output end of pre equalizer plus and circuit input.
Beneficial effect：
The utility model realizes baseband digital signal to the hardware modulated process of optical frequency signal so that signal can successfully be sent out
Penetrate, visible light communication is come true from theory, signal inputs from baseband modulator, passes through skill of the present utility model in each module
Under function after the connection of art scheme, light emitting diode matrix is finally driven, light emitting diode matrix is lighted, and cause letter
Number launched, so as to complete the function of visible light wireless communication physical layer optical frequency modulator.
Brief description of the drawings
Fig. 1 is the visible light wireless communication physical layer optical frequency modulator structure block diagram of the utility model embodiment；
Fig. 2 is the D/A converting circuit schematic diagram of the utility model embodiment；
Fig. 3 is the circuit theory diagrams of the variable gain amplifier (VGA) of the utility model embodiment；
Fig. 4 is the offset controller circuit theory diagrams of the utility model embodiment；
Fig. 5 is the low pass filter of the utility model embodiment and the circuit catenation principle figure of pre equalizer；
Fig. 6 is the utility model embodiment plus and circuit theory diagrams；
Fig. 7 is the circuit theory diagrams of the transconductance driver of the utility model specific implementation method.
Embodiment
Specific embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings.
It can be seen that light wireless communication physical layer optical frequency modulator, as shown in figure 1, including：
By baseband modulator of the local data modulation conversion into subcarrier numeral signal output to D/A converting circuit；
Subcarrier data signal is converted to the D/A converting circuit of subcarrier imitating voltage signal；
Gain amplification is carried out to subcarrier imitating voltage signal and exports signal gain and the biasing of the voltage signal of biasing
Control circuit；
Lift the low pass filter of the subcarrier imitating voltage signal signal to noise ratio of variable gain amplifier output；
Resist the pre equalizer of the photoelectric distortion of subcarrier imitating voltage signal of low pass filter output；
The voltage signal of biasing is produced to offset controller and the subcarrier imitating voltage signal of pre equalizer output is carried out
Add sum plus and circuit；
It will add and be converted into subcarrier imitating current signal driving luminous two with the subcarrier imitating voltage signal of circuit output
The transconductance driver of pole pipe array；Circuit placement-and-routing employs distributed, distal end single-point altogether in the transconductance driver
Mode.
The light emitting diode matrix of optical frequency modulation will be completed on subcarrier imitating current signal modulation to visible frequency.
The input of the output end connection D/A converting circuit of baseband modulator, the output end connection letter of D/A converting circuit
The output end of number gain and the input of bias control circuit, signal gain and bias control circuit connects low pass filter respectively
Input and plus and circuit input, the output end connection of low pass filter and pre equalizer plus and circuit input,
Add the input that transconductance driver is connected with the output end of circuit, the output end connecting luminous diode array of transconductance driver
Input.
The baseband modulator uses DFTS-OFDM（Discrete Fourier Transformations-
Orthogonal Frequency Division Multiplexing）The mode of modulation, by local data modulation conversion into pair
Carrier wave data signal.
The D/A converting circuit, as shown in Fig. 2 including：
Subcarrier data signal is converted to the digital analog converter 1 of subcarrier imitating current signal, using DAC904 chips；
Subcarrier imitating current signal is converted into the transreactance amplifier 2 of subcarrier imitating voltage signal, used
ADA4857-2 chips；
The output end of the input connection baseband modulator of digital analog converter 1, the output end connection mutual resistance of digital analog converter 1
The input of amplifier 2, the output end connection signal gain of transreactance amplifier 2 and the input of bias control circuit.Base band is adjusted
DIN [1 ... .14] interface connection of subcarrier data signal and D/A converting circuit after the completion of system., SIGNAL_BB_OUT connects
Mouth is connected with the SIGNAL_BB_OUT interfaces in Fig. 3.Digital analog converter output subcarrier imitating current signal it is fainter and
Operation inconvenience, therefore this signal is converted into subcarrier imitating voltage signal by transreactance amplifier.
The signal gain and bias control circuit, including：
Set and the controller of the signal biasing of the signal gain of storage variable gain amplifier and offset controller is consolidated
Part；
The subcarrier imitating voltage signal that the signal gain set according to controller firmware exports to transreactance amplifier is carried out
The variable gain amplifier (VGA) of gain amplification, as shown in figure 3, the SIGNAL_BB_OUT interfaces of variable gain amplifier and figure
SIGNAL_BB_OUT interfaces connection in 2, SIGNAL_TX_GAIN interfaces are connected with the SIGNAL_TX_GAIN interfaces in Fig. 4,
SIGNAL_TX_OUT and Fig. 5 SIGNAL_TX_OUT interfaces connection；
The offset controller that the signal biasing set according to controller firmware produces the voltage signal of biasing and exported, such as schemes
Shown in 4, the SIGNAL_TX_GAIN interfaces of offset controller are connected with the SIGNAL_TX_GAIN interfaces in Fig. 3, biasing control
SIGNAL_TX_BAIS interfaces connection in the SIGNAL_TX_BAIS and Fig. 6 of device；
The output end of controller firmware connects the input of variable gain amplifier and the input of offset controller respectively,
The input of variable gain amplifier is also connected with the output end of transreactance amplifier in D/A converting circuit, the output of offset controller
End connection plus the input with circuit, the output end connection low pass filter of variable gain amplifier and the input of pre equalizer
The output end connection of end, low pass filter and pre equalizer adds and the input of circuit.
Shown in Fig. 5 is the circuit catenation principle figure of low pass filter and pre equalizer, SIGNAL_TX_OUT therein with
Fig. 3 SIGNAL_TX_OUT connections, SIGNAL_HPF_OUT interfaces are connected with the SIGNAL_TX_OUT in Fig. 6.
Shown in Fig. 6 be plus and circuit, by pre equalizer output subcarrier imitating voltage signal and offset controller it is defeated
The offset signal gone out sums up.SIGNAL_TX_BIAS interfaces in figure are connected with the SIGNAL_TX_OUT in Fig. 4,
SIGNAL_TX_OUT interfaces and Fig. 5 SIGNAL_HPF_OUT interfaces connect, in SIGNAL_TX_MOS_GATE interfaces and Fig. 7
SIGNAL_TX_TRAN_BASE interfaces connection.
Shown in Fig. 7 is transconductance driver, for driving light emitting diode matrix, makes LED lighting and launches light letter
Number.SIGNAL_TX_TRAN_BASE interfaces in figure are connected with the SIGNAL_TX_MOS_GATE interfaces in Fig. 6.Mutual conductance drives
The output end of device is that light emitting diode matrix is connected with LED_POWER.
It can be seen that light wireless communication physical layer optical frequency modulator approach is as follows：
Baseband modulator is by local data modulation conversion into subcarrier numeral signal output to digital analog converter；Digital-to-analogue conversion
Subcarrier data signal is converted to subcarrier imitating voltage signal by circuit；Signal gain is changed with bias control circuit logarithmic mode
The subcarrier imitating voltage signal of transreactance amplifier output in device carries out gain amplification and exports the voltage signal of biasing；Low pass
The subcarrier imitating voltage signal signal to noise ratio of wave filter lifting variable gain amplifier output；Pre equalizer resists low pass filter
The photoelectric distortion of subcarrier imitating voltage signal of output；Add the voltage signal for producing biasing to offset controller with circuit
Summed up with the subcarrier imitating voltage signal of pre equalizer output；Transconductance driver will add subcarrier mould with circuit output
Intend voltage signal and be converted into subcarrier imitating current signal driving light emitting diode matrix, i.e., subcarrier imitating current signal is adjusted
Make and optical frequency modulation is completed in visible frequency, enable that light emitting diode matrix lights and so that optical signal is launched.
Claims (4)
- A kind of 1. visible light wireless communication physical layer optical frequency modulator, it is characterised in that including：By baseband modulator of the local data modulation conversion into subcarrier numeral signal output to D/A converting circuit；Subcarrier data signal is converted to the D/A converting circuit of subcarrier imitating voltage signal；Gain amplification is carried out to subcarrier imitating voltage signal and exports signal gain and the biasing control of the voltage signal of biasing Circuit；Lift the low pass filter of the subcarrier imitating voltage signal signal to noise ratio of variable gain amplifier output；Resist the pre equalizer of the photoelectric distortion of subcarrier imitating voltage signal of low pass filter output；The voltage signal of biasing is produced to offset controller and the subcarrier imitating voltage signal of pre equalizer output sums up Plus and circuit；It will add and be converted into subcarrier imitating current signal driving light emitting diode with the subcarrier imitating voltage signal of circuit output The transconductance driver of array；The light emitting diode matrix of optical frequency modulation will be completed on subcarrier imitating current signal modulation to visible frequency；The input of the output end connection D/A converting circuit of baseband modulator, the output end connection signal of D/A converting circuit increase The output end of benefit and the input of bias control circuit, signal gain and bias control circuit connects the defeated of low pass filter respectively Enter end and add and the input of circuit, the output end connection of low pass filter and pre equalizer plus and circuit input, add with The input of the output end connection transconductance driver of circuit, the input of the output end connecting luminous diode array of transconductance driver End.
- 2. visible light wireless communication physical layer optical frequency modulator according to claim 1, it is characterised in that the base band is adjusted Device processed is by the way of DFTS-OFDM modulation, by local data modulation conversion into subcarrier data signal.
- 3. visible light wireless communication physical layer optical frequency modulator according to claim 1, it is characterised in that the digital-to-analogue turns Circuit is changed, including：Subcarrier data signal is converted to the digital analog converter of subcarrier imitating current signal；Subcarrier imitating current signal is converted into the transreactance amplifier of subcarrier imitating voltage signal；The output end of the input connection baseband modulator of digital analog converter, the output end connection transreactance amplifier of digital analog converter Input, transreactance amplifier output end connection signal gain and bias control circuit input.
- 4. visible light wireless communication physical layer optical frequency modulator according to claim 1, it is characterised in that the signal increases Benefit and bias control circuit, including：Set and store the controller firmware of the signal gain of variable gain amplifier and the signal biasing of offset controller；The subcarrier imitating voltage signal that the signal gain logarithm analog conversion circuit set according to controller firmware exports is increased The variable gain amplifier of benefit amplification；The offset controller that the signal biasing set according to controller firmware produces the voltage signal of biasing and exported；The output end of controller firmware connects the input of variable gain amplifier and the input of offset controller respectively, variable The input of gain amplifier is also connected with the output end of D/A converting circuit, and the output end connection of offset controller adds and circuit Input, the output end connection low pass filter of variable gain amplifier and the input of pre equalizer, low pass filter with it is pre- The output end connection of balanced device plus the input with circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720715670.0U CN206977428U (en) | 2017-06-20 | 2017-06-20 | It can be seen that light wireless communication physical layer optical frequency modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720715670.0U CN206977428U (en) | 2017-06-20 | 2017-06-20 | It can be seen that light wireless communication physical layer optical frequency modulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206977428U true CN206977428U (en) | 2018-02-06 |
Family
ID=61408870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720715670.0U Withdrawn - After Issue CN206977428U (en) | 2017-06-20 | 2017-06-20 | It can be seen that light wireless communication physical layer optical frequency modulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206977428U (en) |
-
2017
- 2017-06-20 CN CN201720715670.0U patent/CN206977428U/en not_active Withdrawn - After Issue
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Granted publication date: 20180206 Effective date of abandoning: 20230418 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180206 Effective date of abandoning: 20230418 |
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