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A Visible Light Multicarrier Transmission Method Using Multiplicative Clipping

A transmission method and visible light technology, applied in the field of wireless optical communication, can solve the problems of the overall performance of the system, easy access to nonlinear regions, nonlinear power amplifiers, etc., to reduce PAPR, improve energy utilization, and reduce peak-to-average ratio. Effect

Active Publication Date: 2017-05-10
白盒子(上海)微电子科技有限公司
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Problems solved by technology

Binary on-off keying modulation (OOK) is simple to implement but poor in energy efficiency
When the data at the input of the IFFT is in phase, its output will have a large peak value, thus causing an excessive peak-to-average ratio (PAPR)
[0006] Whether it is ACO-OFDM, DCO-OFDM, or PAM-DMT, there is a problem of too high PAPR
Excessive PAPR will not only increase the requirements for the linear range of analog-to-digital and digital-to-analog converters, but also make the signal easily enter the nonlinear region when passing through the circuit, resulting in signal distortion and a significant impact on the overall performance of the system
In the optical system, not only the power amplifier has nonlinearity, but also the light-emitting diode (LED) has nonlinearity, so the nonlinear effect caused by too high PAPR is more serious

Method used

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  • A Visible Light Multicarrier Transmission Method Using Multiplicative Clipping
  • A Visible Light Multicarrier Transmission Method Using Multiplicative Clipping
  • A Visible Light Multicarrier Transmission Method Using Multiplicative Clipping

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Embodiment Construction

[0033]The present invention will be further described below in conjunction with the accompanying drawings.

[0034] A multiplicative clipping transmission scheme for pulse amplitude-discrete multi-tone modulation (PAM-DMT) visible light multi-carrier communication system: according to the characteristics of the modulation signal of PAM-DMT, the signal amplitude is the same at the symmetrical sampling position of the time domain signal, Signs are reversed. The positive signals in each group of symmetrical time domain signals are reserved, and the negative signals are set to zero. Set the maximum light signal threshold value to η c , when the data bit is greater than η c When , the data bit is multiplied by a given constant α for clipping, and then the symmetrical position signal value is changed from 0 to a fixed signal value flag as a flag bit. This method effectively reduces the peak-to-average ratio (PAPR) of the transmitted optical signal through multiplicative clipping,...

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Abstract

The invention discloses a visible light multi-carrier transmission method using multiplicative clipping. Positive value signals in each set of symmetrical time domain signals are reserved according to the characteristics of PAM-DMT modulation signals, and zero setting is conducted on negative value signals. The maximum optical signal threshold value is set as eta c, and when the data bit is larger than eta c, clipping is conducted after the data bit is multiplied with a given constant alpha. Then, the signal values at symmetrical positions are changed into preset fixed signal values from 0 so that the symmetrical position can serve as mark bits. A system receiving end determines signal clipping positions and the mark bits through an MAP detection method, signal recovery is conducted according to the multiplicative clipping principle used by a sending end, and therefore the sending signal detection is completed. By means of the method, the PAPR of emitted light signals is effectively reduced through multiplicative clipping, the method is easy to achieve, the system energy utilization rate is increased while the PAPR is restrained, the requirements a system for the linear ranges of power amplifiers and light-emitting diodes, the nonlinear distortion of signals in the electric domain and the light domain is reduced, and the overall performance of the system is improved.

Description

technical field [0001] The invention relates to a visible light multi-carrier transmission method using multiplicative clipping, which belongs to wireless optical communication technology. Background technique [0002] Due to the fact that it is not affected by the growing radio frequency coverage and enjoys a large amount of spectrum resources, visible light communication has attracted extensive attention in the field of next-generation wireless transmission. Since the current optical communication system generally adopts intensity modulation / direct detection (IM / DD), that is, the signal modulates the intensity of light, so it is necessary to ensure that the time domain signal is a positive real number. Binary on-off keying modulation (OOK) is simple to implement, but has poor energy efficiency. In order to improve the data transmission rate and spectrum utilization, and resist multipath fading at the same time, the discrete multi-tone modulation technique (DMT) derived fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/116H04B10/556
Inventor 许威徐锦丹张华
Owner 白盒子(上海)微电子科技有限公司
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