A DC bias optimization method for multi-carrier visible light communication system

A technology of visible light communication and DC bias, applied in the field of visible light communication, can solve problems such as signal distortion and waste of energy, and achieve the effect of small calculation, high precision of results, and easy realization

Active Publication Date: 2015-11-18
SOUTHEAST UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, the DC bias does not transmit the signal, and if it is too large, it will waste energy; if it is too small, it will seriously distort the signal

Method used

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  • A DC bias optimization method for multi-carrier visible light communication system
  • A DC bias optimization method for multi-carrier visible light communication system
  • A DC bias optimization method for multi-carrier visible light communication system

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Embodiment 1

[0035] Given specific parameters as follows, K=256; M=16; H=1; γ b = 20dB; β = 1; P elec,max =0.1;P opt,max =0.2, with the system bit error rate as the optimization goal, solve the optimal undetermined parameters σ and B dc .

[0036] Concrete implementation steps of the present invention are as follows:

[0037] 1) The multi-carrier visible light communication system of the present invention uses DCO-OFDM technology, wherein the transmitter block diagram is as follows figure 1 As shown, the receiver block diagram is shown in figure 2 shown. Determine the modulation order M used according to the data rate and communication quality required by the user; determine the maximum electric power P according to the hardware used elec,max and maximum optical power P opt,max ; According to the working environment of the system, estimate the channel coefficient H and the bit energy-to-noise ratio γ b ;

[0038] 2), let a=B dc / σ, s=(H 2 gamma b log 2 M) -1 . Denote the fu...

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Abstract

The invention discloses a direct-current offset optimization method of a multi-carrier visible light communication system. The optimization method aims at finding the direct-current offset Bdc which enables bit error probability of the system to be the lowest, and each subcarrier power sigma 2. The optimization method comprises the following steps: firstly confirming systematic parameters according to required indicators, hardware restrictions and the working environment, then setting intermediate variable a= Bdc / sigma, using an iterative algorithm for solving the lowest bit error probability aopt of the system, finally, considering a light power restriction condition and an electric power restriction condition, confirming the Bdc and the sigma 2 according to the aopt, and completing the optimal design of the system. The optimized method can rapidly and precisely obtain the optimal parameter design scheme, enables the visible light communication system based on DCO-OFDM to obtain the lowest bit error probability, achieves the biggest reachable speed rate, and meanwhile is small in calculated amount, easy to achieve and high in precision.

Description

technical field [0001] The invention belongs to the field of visible light communication, and in particular relates to a DC bias optimization method for a multi-carrier visible light communication system. Background technique [0002] The next generation of wireless communication systems (5G) will introduce several complementary access technologies. The visible light communication technology based on Light Emitting Diode (LED for short) is very likely to become the basis of 5G. In LED-based visible light communication technology, light-emitting diodes are used to convert electrical signals into optical signals at the transmitting end. After the optical signals propagate through the channel, the optical signals are converted into electrical signals through photodiodes at the receiving end for demodulation circuit processing. Visible light communication systems generally adopt the direct detection method of intensity modulation, that is, the transmitting end uses the light in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/06H04L27/26H04B10/116
Inventor 王家恒凌昕彤赵春明
Owner SOUTHEAST UNIV
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