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Modulation method for reducing peak-to-average power ratio of orthogonal frequency division multiplexing-visible light communication (OFDM-VLC) system

A technology of OFDM-VLC and peak-to-average power ratio, which is applied in the field of new modulation schemes and can solve problems such as inability to modulate and demodulate

Active Publication Date: 2016-07-27
SYSU CMU SHUNDE INT JOINT RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional OFDM symbols are in complex form and cannot be demodulated by IM / DD modulation

Method used

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  • Modulation method for reducing peak-to-average power ratio of orthogonal frequency division multiplexing-visible light communication (OFDM-VLC) system
  • Modulation method for reducing peak-to-average power ratio of orthogonal frequency division multiplexing-visible light communication (OFDM-VLC) system
  • Modulation method for reducing peak-to-average power ratio of orthogonal frequency division multiplexing-visible light communication (OFDM-VLC) system

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Experimental program
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Embodiment 1

[0070] The core of the new "peak clipping mapping technology" proposed by the present invention is to convert the electrical signal in the complex domain into an optical signal in the form of a positive real number that can be modulated by light intensity with a certain mapping rule, so as to achieve better PAPR suppression effect and BER performance. After the optical signal is transmitted through the LED light, it is restored to a complex domain electrical signal at the receiving end according to the same rules.

[0071] Method provided by the invention comprises the following steps:

[0072] 1. Receiver

[0073] Step 1, such as figure 1 As shown, the bit stream information first needs to be serial / parallel converted, and the bit information is mapped to the constellation diagram. The constellation diagrams involved in this embodiment are all three-dimensional constellation diagrams.

[0074] Step two, such as figure 2 As shown, each constellation point on the 3-D cons...

Embodiment 2

[0123] In order to more fully illustrate the beneficial effects of the present invention, the effectiveness and advancement of the present invention will be further described below in combination with simulation analysis and results. The simulation system selects a typical indoor room model, and the size of the room is set to be 5 meters in length and width, and 3 meters in height. The LED light is set in the center of the ceiling as the light signal transmitting end, the light detector is set in the center of the floor as the receiving end, and no other obstacles are set. The number of indoor light reflections is set to 3. For the sake of fairness, the effective subcarrier signals of each OFDM scheme are set to 32. In this example, l=4, m=2, n=2.

[0124] Figure 7 Shows the probability that the peak power ratio of the OFDM symbol in the OFDM-VLC system exceeds the specified threshold Z, and its abscissa is defined as:

[0125]

[0126] where x tmax Indicates the sign...

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Abstract

The invention discloses a modulation method for reducing a peak-to-average power ratio of an orthogonal frequency division multiplexing-visible light communication (OFDM-VLC) system. According to the modulation method provided by the invention, through performing specific peak clipping and mapping treatments on visible light vector signals, the peak-to-average power ratio of the OFDM-VLC system can be effectively reduced, and meanwhile the bit error rate performance of the system can also be improved.

Description

technical field [0001] The present invention faces the field of visible light communication (VisibleLightCommunication, VLC), and proposes an optical orthogonal frequency division multiplexing (OpticalFrequencyDivisionMultiplexing, OOFDM) that can effectively improve bit error rate (BitErrorRate, BER) performance and reduce system peak-average power Ratio (Peak-to-AveragePowerRatio, PAPR) of the new modulation scheme. Background technique [0002] With the development of modern science and technology and the widespread application of light-emitting diodes (Light-emitting Diode, LED) in daily life, the visible light communication (VisibleLightCommunication, VLC) technology based on LED lights has gradually attracted the attention of all parties and has launched research on it. VLC mainly uses intensity modulation (Intensity Modulation, IM) and direct detection (Direct Detection, DD) technology to realize the transmission of information by using the rapidly changing light inte...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04B10/116
CPCH04B10/116H04L27/2623
Inventor 陈嘉伟江明
Owner SYSU CMU SHUNDE INT JOINT RES INST
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