CN112564799A - Method for inhibiting peak-to-average power ratio of visible light MIMO-OFDM system - Google Patents

Method for inhibiting peak-to-average power ratio of visible light MIMO-OFDM system Download PDF

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CN112564799A
CN112564799A CN202011383459.6A CN202011383459A CN112564799A CN 112564799 A CN112564799 A CN 112564799A CN 202011383459 A CN202011383459 A CN 202011383459A CN 112564799 A CN112564799 A CN 112564799A
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解志斌
徐桧
卢晓艳
翁智辉
刘民东
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Jiangsu University of Science and Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H04L27/2615—Reduction thereof using coding

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Abstract

The invention belongs to the technical field of visible light communication, and particularly relates to a visible light MIMO-OFDM system peak-to-average power ratio restraining method based on precoding. At a transmitting end, performing space-time coding on signals input by the MIMO-OFDM system, generating Nt data by Nt antennas, dividing each antenna into respective data, performing serial-to-parallel conversion and QAM modulation on the data, performing Van der Monte matrix precoding operation, and finally performing IFFT, CP adding, parallel-to-serial conversion and adaptive scaling operation on information streams obtained after VLM precoding operation and then transmitting the information streams through the Nt antennas; at a receiving end, Nr receiving antennas receive signals, and then perform a series of operations such as demodulation on the respective received signals, and then perform space-time decoding on the signals to obtain output signals. The method has the advantages that the peak-to-average ratio of the visible light MIMO-OFDM communication system is suppressed by utilizing the precoding technology, and compared with the prior art, the method has the characteristics of simplicity in implementation, lower complexity and the like.

Description

Method for inhibiting peak-to-average power ratio of visible light MIMO-OFDM system
Technical Field
The invention belongs to the technical field of visible light communication, and particularly relates to a visible light MIMO-OFDM system peak-to-average ratio suppression method, which is a visible light MIMO-OFDM system peak-to-average ratio suppression method based on precoding and is provided aiming at the transmission environment of a visible light communication system and the characteristics of a multi-Input multi-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) system.
Background
The visible light communication is a communication technology which takes air as a transmission medium and utilizes LED visible light as a signal carrier to realize bidirectional transmission of data, voice and image information. The visible light communication has the characteristics of large communication capacity, strong anti-interference capability, good confidentiality, low cost and the like, and has wide application prospect in the current communication field.
With the continuous improvement of the data transmission amount of visible light communication, the required modulation mode is changed along with the updating of the technology, and the multi-carrier communication MIMO-OFDM system is widely applied to the visible light communication system. The MIMO technology can effectively overcome adverse effects of the environment due to the adoption of a multi-antenna technology, and provides higher signal transmission quality and capacity than a conventional antenna system under the same transmission condition. The OFDM technique divides a fading channel in a channel into sub-channels orthogonal to each other to reduce the complexity of an equalization technique at a decoding end and provide a high transmission rate. The visible light MIMO-OFDM system adopts an intensity modulation/direct detection (IM/DD) modulation mode, so a baseband OFDM signal must be a real signal and satisfies nonnegativity. The direct current bias optical orthogonal frequency division multiplexing (DCO-OFDM) system realizes conversion from bipolar to unipolar by adding direct current bias and cutting off a part of a signal which is still less than zero, and the system is simple to implement and relatively high in spectral efficiency, so that the system becomes a research hotspot in the field of optical communication. However, in the DCO-OFDM communication system, the core device LED has typical nonlinear characteristics, the dynamic range is limited, and the DCO-OFDM signal peaks are relatively high, and when these signals with large peaks pass through the LED, serious nonlinear distortion is generated, which greatly affects the communication performance of the system.
The existing methods for inhibiting the peak-to-average power ratio can be roughly divided into three categories: clipping class, coding class, probability class. The three methods have advantages and disadvantages. The Clipping class comprises methods of Clipping Filtering, peak windowing, compression expansion and the like, and a Clipping Filtering method is proposed in IEEE Transactions on Communications volume 55, volume 1, Recurved Clipping and Filter With bound resolution for PAPR Reduction, so that the peak-to-average ratio is effectively reduced under the condition of not introducing large calculation amount, but the nonlinear process can bring about signal Distortion, the Reduction of the error rate and the Reduction of the spectrum utilization rate. The encoding method comprises the following steps: chinese patent CN103248602A discloses a method for block coding to reduce peak-to-average ratio, and codes the original information to make the signal transmitted in a code group mode with lower peak-to-average ratio, but its coding efficiency is lower, and it is only suitable for the situation of smaller sub-carrier. The probability method comprises methods of selective mapping, partial sequence transmission and the like, and Chinese patent CN03973629A discloses a method for inhibiting MIMO-OFDM peak-to-average ratio by using SLM, which can effectively reduce the peak-to-average ratio of signals without generating distortion on the signals, and is suitable for any number of subcarriers, but the calculation complexity is higher, and auxiliary information bits need to be transmitted, so the spectrum utilization rate is lower.
Disclosure of Invention
The invention aims to provide a simple and effective precoding method for further inhibiting the peak-to-average ratio of a system aiming at the problem that the visible light MIMO-OFDM system has higher peak-to-average ratio. Compared with the existing precoding technology, the method can better reduce the peak-to-average power ratio of the system after a new precoding method is added.
The purpose of the invention is realized by the following technical scheme:
a method for suppressing the peak-to-average power ratio of a visible light MIMO-OFDM system is characterized in that the method is based on precoding. At the transmitting end, the signals input by the MIMO-OFDM system are subjected to space-time coding, and N is providedtRoot antennaGenerate NtData sharing, each antenna getting respective data, then performing serial-to-parallel conversion and QAM modulation on the data, then performing Vandermonde Like Matrix (VLM) precoding operation, finally performing a series of operations such as IFFT, CP addition, parallel-to-serial conversion and adaptive scaling on the information stream obtained after VLM precoding operation, and then passing through NtThe root antenna sends out; at the receiving end, NrThe receiving antenna receives the signal, and then performs a series of operations such as demodulation and the like on the respective received signal, and then performs space-time decoding on the signal to obtain an output signal.
The method specifically comprises the following steps:
the method comprises the following steps: space-time coding the input signal to NtTransmitting the signals from different antennas to obtain NtFrequency domain signal of strip serial
Figure BDA0002810303640000021
Step two: the frequency domain signal on each antenna branch needs to perform a series of transformation and pre-coding operations to achieve the effect of inhibiting the peak-to-average ratio, and the specific flow is as follows:
step 1: carrying out serial-to-parallel conversion and QAM modulation on the serial frequency domain signal of each antenna to obtain N rows and M columns of frequency domain signals
Figure BDA0002810303640000031
Wherein i 1,2t；
Step 2: generating an N × N VLM transformation matrix, where VLM transformation matrix P is:
Figure BDA0002810303640000032
wherein the content of the first and second substances,
Figure BDA0002810303640000033
Figure BDA0002810303640000034
wherein k is more than or equal to 1, N is more than or equal to N
Multiplying the generated VLM transform matrix with the frequency domain signal obtained at Step1, i.e. multiplying
Figure BDA0002810303640000035
Wherein i 1,2tObtaining a frequency domain signal after VLM transformation;
step 3: carrying out hermitian conjugate symmetry on the frequency domain signal after VLM transformation to obtain a frequency domain signal after conjugate symmetry as follows:
Figure BDA0002810303640000036
according to the formula, only N/2-1 subcarriers transmit effective data in N subcarriers;
step 4: IFFT conversion is carried out on the frequency domain signals after conjugate symmetry to obtain time domain signals, parallel-serial conversion and cyclic prefix addition are carried out on the time domain signals to obtain serial time domain signals x with the cyclic prefixi(n)；
Step 5: for time domain signal xi(n) carrying out self-adaptive scaling to obtain a scaled time domain signal
Figure BDA0002810303640000037
Figure BDA0002810303640000038
Wherein:
Figure BDA0002810303640000039
in the formula, betaiFor adaptive scaling factors of different LED transmit antennas,
Figure BDA00028103036400000310
and
Figure BDA00028103036400000311
respectively the lower and upper voltage limits of the LED,
Figure BDA0002810303640000041
and
Figure BDA0002810303640000042
respectively time domain signals x (n)iA minimum amplitude and a maximum amplitude.
Step 6: for the scaled time domain signal
Figure BDA0002810303640000043
Performing digital-to-analog conversion to obtain analog signal
Figure BDA0002810303640000044
Step 7: selecting a DC offset value between a lower limit voltage and an upper limit voltage of the LED
Figure BDA0002810303640000045
And bias the DC offset value
Figure BDA0002810303640000046
Loaded on to analogue signals
Figure BDA0002810303640000047
In the method, an analog signal with DC bias is obtained
Figure BDA0002810303640000048
Figure BDA0002810303640000049
Wherein:
Figure BDA00028103036400000410
wherein the content of the first and second substances,
Figure BDA00028103036400000411
and
Figure BDA00028103036400000412
respectively, the lower and upper voltage limits of the LED.
Step 8: to the analog signal with DC bias
Figure BDA00028103036400000413
Performing amplitude limiting operation to obtain a signal to be transmitted
Figure BDA00028103036400000414
Figure BDA00028103036400000415
Step 9: transmitting signals in the form of electrical signals
Figure BDA00028103036400000416
Signal to be transmitted converted into optical signal form
Figure BDA00028103036400000417
And transmitted over the channel.
Step three: at the receiving end NrThe root antenna receives the sending signal and respectively carries out a series of inverse operations to obtain the sending signal;
step four: and performing space-time decoding on the signals obtained by each antenna to obtain output signals.
The invention has the beneficial effects that: compared with the prior art, the method utilizes the precoding technology to inhibit the peak-to-average power ratio of the visible light MIMO-OFDM communication system, and has the characteristics of simple realization, lower complexity and the like compared with the prior art. And the existing self-adaptive scaling technology is combined with pre-coding to further restrain the peak-to-average ratio and reduce the error rate. The method is provided by combining the nonlinear characteristics of the LED and considering the complexity of the MIMO-OFDM, and can be well suitable for a visible light MIMO-OFDM communication system.
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FIG. 1 is a diagram of a system model for suppressing peak-to-average power ratio in a visible light MIMO-OFDM system.
FIG. 2 is a diagram of a detailed model of DCO-OFDM system under a visible light MIMO-OFDM system.
FIG. 3 is a flow chart of peak-to-average ratio suppression for a visible MIMO-OFDM system.
FIG. 4 is a detailed flow chart of DCO-OFDM under the visible light MIMO-OFDM system.
Detailed description of the invention
For the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
Example (b): fig. 1 is a system model diagram of a method for suppressing peak-to-average power ratio in a visible light MIMO-OFDM system based on precoding according to the present invention.
At the transmitting end, the signals input by the MIMO-OFDM system are subjected to space-time coding, and N is providedtThe root antenna generates NtData sharing, each antenna obtains respective data, then serial-to-parallel conversion and QAM modulation are carried out on the data, VLM precoding operation is carried out, finally, a series of operations such as IFFT, CP addition, parallel-to-serial conversion and self-adaptive scaling are carried out on information flow obtained after VLM precoding operation, and then N is carried outtThe root antenna sends out; at the receiving end, NrThe receiving antenna receives the signal, and then performs a series of operations such as demodulation and the like on the respective received signal, and then performs space-time decoding on the signal to obtain an output signal. The values of the parameters are as follows: nt is 4; nr is 4; n-64; m is 1000;
Figure BDA0002810303640000051
the method comprises the following specific steps:
the method comprises the following steps: space-time coding the input signal to NtTransmitting the signals from different antennas to obtain NtFrequency domain signal of strip serial
Figure BDA0002810303640000052
Step two: the frequency domain signal on each antenna branch needs to perform a series of transformation and pre-coding operations to achieve the effect of inhibiting the peak-to-average ratio, and the specific flow is as follows:
step 1: carrying out serial-to-parallel conversion and QAM modulation on the serial frequency domain signal of each antenna to obtain N rows and M columns of frequency domain signals
Figure BDA0002810303640000053
Wherein i 1,2t；
Step 2: generating an N × N VLM transformation matrix, where VLM transformation matrix P is:
Figure BDA0002810303640000054
wherein the content of the first and second substances,
Figure BDA0002810303640000061
Figure BDA0002810303640000062
wherein k is more than or equal to 1, N is more than or equal to N
Multiplying the generated VLM transform matrix with the frequency domain signal obtained at Step1, i.e. multiplying
Figure BDA0002810303640000063
Wherein i 1,2tObtaining a frequency domain signal after VLM transformation;
step 3: carrying out hermitian conjugate symmetry on the frequency domain signal after VLM transformation to obtain a frequency domain signal after conjugate symmetry as follows:
Figure BDA0002810303640000064
according to the formula, only N/2-1 subcarriers transmit effective data in N subcarriers;
step 4: IFFT conversion is carried out on the frequency domain signals after conjugate symmetry to obtain time domain signals, parallel-serial conversion and cyclic prefix addition are carried out on the time domain signals to obtain serial time domain signals x with the cyclic prefixi(n)；
Step 5: for time domain signal xi(n) carrying out self-adaptive scaling to obtain a scaled time domain signal
Figure BDA0002810303640000065
Figure BDA0002810303640000066
Wherein:
Figure BDA0002810303640000067
in the formula, betaiFor adaptive scaling factors of different LED transmit antennas,
Figure BDA0002810303640000068
and
Figure BDA0002810303640000069
respectively the lower and upper voltage limits of the LED,
Figure BDA00028103036400000610
and
Figure BDA00028103036400000611
respectively time domain signals x (n)iA minimum amplitude and a maximum amplitude.
Step 6: for the scaled time domain signal
Figure BDA00028103036400000612
Performing digital-to-analog conversion to obtain analog signal
Figure BDA00028103036400000613
Step 7: selecting a DC offset value between a lower limit voltage and an upper limit voltage of the LED
Figure BDA00028103036400000614
And bias the DC offset value
Figure BDA00028103036400000615
Loaded on to analogue signals
Figure BDA00028103036400000616
In the method, an analog signal with DC bias is obtained
Figure BDA00028103036400000617
Figure BDA00028103036400000618
Wherein:
Figure BDA0002810303640000071
wherein the content of the first and second substances,
Figure BDA0002810303640000072
and
Figure BDA0002810303640000073
respectively, the lower and upper voltage limits of the LED.
Step 8: to the analog signal with DC bias
Figure BDA0002810303640000074
Performing amplitude limiting operation to obtain a signal to be transmitted
Figure BDA0002810303640000075
Figure BDA0002810303640000076
Step 9: transmitting signals in the form of electrical signals
Figure BDA0002810303640000077
Signal to be transmitted converted into optical signal form
Figure BDA0002810303640000078
And transmitting via a channel;
step three: at the receiving end NrThe root antenna receives the sending signal and respectively carries out a series of inverse operations to obtain the sending signal;
step four: and performing space-time decoding on the signals obtained by each antenna to obtain output signals.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (8)

1. A method for suppressing the peak-to-average power ratio of a visible light MIMO-OFDM system is characterized in that the method is based on precoding. At the transmitting end, the signals input by the MIMO-OFDM system are subjected to space-time coding, and N is providedtThe root antenna generates NtData are shared, each antenna is divided into respective data, then serial-to-parallel conversion and QAM modulation are carried out on the data, then Vandermonde Like Matrix (VLM) precoding operation is carried out, finally IFFT, CP addition, parallel-to-serial conversion and self-adaptive scaling operation are carried out on information flow obtained after VLM precoding operation, and then N is carried outtThe root antenna sends out; at the receiving end, NrThe receiving antenna receives the signal, and then performs a series of operations such as demodulation and the like on the respective received signal, and then performs space-time decoding on the signal to obtain an output signal.
2. The method for suppressing the peak-to-average power ratio of the visible light MIMO-OFDM system according to claim 1, comprising the steps of:
the method comprises the following steps: space-time coding the input signal to NtTransmitting the signals from different antennas to obtain NtFrequency domain signal of strip serial
Figure FDA0002810303630000011
Step two: carrying out a series of transformation and pre-coding operations on the frequency domain signals on each antenna branch to achieve the effect of inhibiting the peak-to-average ratio;
step three: at the receiving end NrThe root antenna receives the sending signal and respectively carries out a series of inverse operations to obtain the sending signal;
step four: and performing space-time decoding on the signals obtained by each antenna to obtain output signals.
3. The method according to claim 2, wherein in the second step, a series of transformation and pre-coding operations are performed on the frequency domain signal of each antenna branch to achieve the effect of peak-to-average ratio suppression, and the specific process is as follows:
step 1: carrying out serial-to-parallel conversion and QAM modulation on the serial frequency domain signal of each antenna to obtain N rows and M columns of frequency domain signals
Figure FDA0002810303630000012
Wherein i 1,2t；
Step 2: generating an N × N VLM transform matrix, and multiplying the generated VLM transform matrix with the frequency domain signal obtained at Step1, i.e. multiplying
Figure FDA0002810303630000013
Wherein i 1,2tObtaining a frequency domain signal after VLM transformation;
step 3: carrying out Hermite conjugate symmetry on the frequency domain signal after VLM transformation to obtain a frequency domain signal after conjugate symmetry;
step 4: IFFT conversion is carried out on the frequency domain signals after conjugate symmetry to obtain time domain signals, andperforming parallel-to-serial conversion and adding cyclic prefix to the time domain signal to obtain a serial time domain signal x with cyclic prefixi(n)；
Step 5: for time domain signal xi(n) carrying out self-adaptive scaling to obtain a scaled time domain signal
Figure FDA0002810303630000021
Step 6: for the scaled time domain signal
Figure FDA0002810303630000022
Performing digital-to-analog conversion to obtain analog signal
Figure FDA0002810303630000023
Step 7: selecting a DC offset value between a lower limit voltage and an upper limit voltage of the LED
Figure FDA0002810303630000024
And bias the DC offset value
Figure FDA0002810303630000025
Loaded on to analogue signals
Figure FDA0002810303630000026
In the method, an analog signal with DC bias is obtained
Figure FDA0002810303630000027
Step 8: to the analog signal with DC bias
Figure FDA0002810303630000028
Performing amplitude limiting operation to obtain a signal to be transmitted
Figure FDA0002810303630000029
Step 9: transmitting information to be transmitted in the form of electrical signalsNumber (C)
Figure FDA00028103036300000210
Signal to be transmitted converted into optical signal form
Figure FDA00028103036300000211
And transmitted over the channel.
4. The method as claimed in claim 3, wherein the VLM transformation matrix P is:
Figure FDA00028103036300000212
wherein the content of the first and second substances,
Figure FDA00028103036300000213
Figure FDA00028103036300000214
wherein k is more than or equal to 1, and N is more than or equal to N.
5. The method of claim 3, wherein the Step3 obtains the frequency domain signal after conjugate symmetry as:
Figure FDA00028103036300000215
6. the method of claim 3, wherein Step5 obtains the scaled time domain signal
Figure FDA0002810303630000031
Figure FDA0002810303630000032
Wherein:
Figure FDA0002810303630000033
in the formula, betaiFor adaptive scaling factors of different LED transmit antennas,
Figure FDA0002810303630000034
and
Figure FDA0002810303630000035
respectively the lower and upper voltage limits of the LED,
Figure FDA0002810303630000036
and
Figure FDA0002810303630000037
respectively time domain signals x (n)iA minimum amplitude and a maximum amplitude.
7. The method of claim 3, wherein Step7 obtains the DC-biased analog signal
Figure FDA0002810303630000038
Wherein:
Figure FDA0002810303630000039
wherein the content of the first and second substances,
Figure FDA00028103036300000310
and
Figure FDA00028103036300000311
respectively, the lower and upper voltage limits of the LED.
8. The method of claim 3, wherein Step8 obtains the signal to be transmitted
Figure FDA00028103036300000312
Figure FDA00028103036300000313
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CN114866392A (en) * 2022-05-13 2022-08-05 江苏科技大学 Visible light OFDM system peak-to-average power ratio suppression method based on amplitude limiting of self-encoder
CN114866392B (en) * 2022-05-13 2023-09-22 江苏科技大学 Peak-average ratio suppression method of visible light OFDM system based on self-encoder amplitude limiting

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