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Method for selecting odd-order quadrature amplitude modulation signal to pre-code constellation point

A quadrature amplitude modulation, constellation point technology, applied in the field of communication, can solve the problem of no effective selection, and achieve the effect of improving performance and increasing communication capacity

Active Publication Date: 2019-03-01
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing visible light communication methods, there is no effective selection scheme according to the bias current and signal amplitude.

Method used

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  • Method for selecting odd-order quadrature amplitude modulation signal to pre-code constellation point
  • Method for selecting odd-order quadrature amplitude modulation signal to pre-code constellation point
  • Method for selecting odd-order quadrature amplitude modulation signal to pre-code constellation point

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1 of the present invention provides a method for selecting precoding constellation points of an odd-order quadrature amplitude modulation signal, figure 1 It is a schematic flowchart of a method for selecting precoding constellation points of an odd-order quadrature amplitude modulation signal provided by Embodiment 1 of the present invention. Such as figure 1 As shown, a method for selecting an odd-order quadrature amplitude modulation signal precoding constellation point in this embodiment may include the following steps:

[0049] Step 101, setting the bias current and peak-to-peak signal strength;

[0050] Step 102, selecting the precoded constellation point as a conventional constellation point, modulating, receiving and recording the first transmitted signal;

[0051] Step 103, according to the recorded first transmission signal, demodulate the first transmission signal and obtain a first bit error rate;

[0052]Step 104, select the precoded constella...

Embodiment 2

[0061] Embodiment 2 of the present invention provides a method for selecting precoded constellation points of an odd-order quadrature amplitude modulation signal, figure 2 It is a schematic flowchart of a method for selecting precoding constellation points of an odd-order quadrature amplitude modulation signal provided by Embodiment 2 of the present invention. Such as figure 2 As shown, a method for selecting an odd-order quadrature amplitude modulation signal precoding constellation point in this embodiment may include the following steps:

[0062] Step 201, recording the bias current, the peak value of the signal strength peak and the order of the quadrature amplitude modulation signal to be modulated;

[0063] Step 202, recording the optical power at the transmitting end and the optical power at the receiving end;

[0064] Step 203, selecting a precoded constellation point as a regular constellation point;

[0065] Step 204, according to the recorded first transmission...

Embodiment 3

[0128] Embodiment 3 of the present invention provides a device for selecting precoded constellation points of odd-order quadrature amplitude modulation signals, such as image 3 As shown, a device for selecting odd-order quadrature amplitude modulation signal precoding constellation points in this embodiment includes:

[0129] Setting means 310, for setting the bias current and peak-to-peak signal strength;

[0130] The first recording device 320 is configured to select the precoded constellation point as a conventional constellation point, modulate, receive and record the first transmitted signal;

[0131] The first demodulation device 330 is configured to demodulate the first transmission signal and obtain a first bit error rate according to the recorded first transmission signal;

[0132] The second recording device 340 is configured to select the precoded constellation point as a full Gray constellation point, modulate, receive and record the second transmitted signal;

...

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Abstract

The invention discloses a method for selecting an odd-order quadrature amplitude modulation signal to pre-code a constellation point. The method comprises the following steps of setting a bias currentand a signal strength peak-to-peak value; selecting the pre-coded constellation point as a conventional constellation point, and modulating, receiving and recording a first transmitting signal; according to the recorded first transmitting signal, demodulating the first transmitting signal and acquiring a first error rate; selecting the pre-coded constellation point as a full-gray constellation point, and modulating, receiving and recording a second transmitting signal; according to the recorded second transmitting signal, demodulating the second transmitting signal and acquiring a second error rate; according to the acquired first error rate and second error rate, performing calculation to obtain an error code difference correction matrix; according to the set bias current and signal strength peak-to-peak value and a standard error code difference formula, performing calculation to obtain a standard error code difference matrix; and building a model according to the error code difference correction matrix and the standard error code difference matrix, and acquiring the proper pre-coded constellation point according to the model and the set bias current and signal strength peak-to-peak value.

Description

technical field [0001] The disclosure of the present invention relates to the communication field, in particular to a method for selecting precoded constellation points of an odd-order quadrature amplitude modulation signal. Background technique [0002] Visible Light Communication (VLC) technology refers to a communication method that uses light in the visible light band as a carrier to directly transmit optical signals through the air without the need for optical fiber lights and wired media. Visible light communication can be realized based on commercial LEDs, which can be used for high-speed communication as well as lighting. As an emerging wireless communication method, visible light communication has the advantages of no electromagnetic interference, rich spectrum resources without registration, low cost and high confidentiality. With the large-scale popularization of commercial LEDs, visible light communication will play an important role in the future military indus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/54H04B10/116H04B10/079
CPCH04B10/07953H04B10/07955H04B10/116H04B10/54
Inventor 迟楠邹鹏王福民胡昉辰
Owner FUDAN UNIV