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A Novel Spatial Quadrature Modulation Method Based on Indoor Visible Light Communication

A technology of visible light communication and quadrature modulation, applied in a variety of modulated transmitter/receiver arrangements, modulated carrier systems, free space transmission, etc., to achieve the effect of improving information transmission quality and BER performance

Inactive Publication Date: 2021-07-23
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, it is worth noting that based on the unipolar characteristics of the signal in the VLC system, there is a constraint problem that the signal adopts intensity modulation / direct detection

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  • A Novel Spatial Quadrature Modulation Method Based on Indoor Visible Light Communication
  • A Novel Spatial Quadrature Modulation Method Based on Indoor Visible Light Communication
  • A Novel Spatial Quadrature Modulation Method Based on Indoor Visible Light Communication

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[0044] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0045] The present invention provides a novel spatial quadrature modulation method based on indoor visible light communication, which includes the following steps:

[0046] Step A): Based on the existing spatial quadrature modulation (SQM) scheme, according to the maximum likelihood estimation criterion, without considering the serial number of the activated LED, the demodulator is given an estimation expression for the transmitted signal;

[0047] Step B): Utilize Paired Error Probability (PEP) and Uniform Bound (UB) technology to give the Symbol Error Rate (SER) expression under the SQM mode;

[0048] Step C): According to the SER expression, by analyzing the characteristics of the transmitted signal, the bit error rate (BER) expression under the SQM mode is given;

[0049] Step D): according to the expression of B...

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Abstract

The invention discloses a novel spatial quadrature modulation method based on indoor visible light communication. The steps are: based on the SQM scheme, according to the maximum likelihood estimation criterion, and under the condition of not considering the serial number of the activated LED, the demodulator is given a pair of sending signals. The estimated expression of BER; using PEP and UB technology, give the SER expression under SQM mode; according to the SER expression, give the BER expression under the SQM mode; according to the BER expression, define the upper limit expression of BER; establish Based on the SQM optimization problem of BER upper limit minimization, the optimization objective function and corresponding constraint conditions are given, so that the NSQM method based on the number of LEDs at the sending end is 4; based on the NSQM method, a 4-ary mapping signal set is designed, and an 8-ary system is given. The design process of the system mapping signal set is given, and the design idea of ​​the hexadecimal mapping signal set is given. Finally, the 64 system mapping signal set is the superposition of 4‑NSQM and 16‑NSQM. This method improves the transmission reliability of the visible light signal by optimizing the mapping method of the transmitted light signal.

Description

technical field [0001] The present invention relates to a modulation method of a visible light signal in an indoor visible light communication scene, in particular to a novel spatial orthogonal modulation method based on indoor visible light communication. Background technique [0002] Visible light communication (VLC) has attracted much attention because of its significant advantages in energy efficiency and indoor wireless communication. The light signal is directly detected using a photodiode (PD) detector. However, it is worth noting that: based on the unipolar characteristics of the signal in the VLC system, there is a constraint problem that the signal adopts intensity modulation / direct detection. Therefore, in order to overcome the above-mentioned challenges and realize efficient and reliable information transmission, technologies such as spatial modulation (SM), multi-ary quadrature amplitude modulation (M-QAM) and spatial quadrature modulation (SQM) have become VLC...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/36H04L27/00H04B10/116
CPCH04B10/116H04L27/0008H04L27/36
Inventor 李宗艳单宝玲李世银
Owner CHINA UNIV OF MINING & TECH
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