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A New Boundary Calculation Method for Multiple Access Channel Capacity Area of ​​Visible Light Communication

A technology of visible light communication and access channel, applied in the field of new boundary computing, can solve the problem of unknown optimal input distribution in VLCMAC capacity domain

Active Publication Date: 2020-10-09
ZHONGTIAN BROADBAND TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the exact VLC MAC capacity domain and optimal input distribution are still unknown so far

Method used

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  • A New Boundary Calculation Method for Multiple Access Channel Capacity Area of ​​Visible Light Communication
  • A New Boundary Calculation Method for Multiple Access Channel Capacity Area of ​​Visible Light Communication
  • A New Boundary Calculation Method for Multiple Access Channel Capacity Area of ​​Visible Light Communication

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Embodiment Construction

[0059] Consider a typical visible light communication multiple access channel VLC MAC system, which includes two transmitters and one receiver. Each transmitter is equipped with an LED, and the receiver is equipped with a single photon detector (PD). Let X 1 And X 2 Respectively represent the transmitted signals of the first transmitter and the second transmitter. Since the information is embedded in the intensity of the light signal, X 1 And X 2 It should be real and non-negative. In addition, according to eye safety standards and actual lighting requirements, peak optical power and average optical power should be limited, so 0≤X 1 ≤A 1 , 0≤X 2 ≤A 2 , Among them, A 1 And A 2 Is the amplitude range of the input signal, μ 1 And μ 2 Is the mean, To find the mean. In the MAC channel, the received signal Y is expressed as:

[0060] Y=X 1 +X 2 +Z (1)

[0061] Where Z is independent Gaussian noise, with a mean value of 0 and a variance of σ 2 ;

[0062] Lemma 1: The capacity domain ...

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Abstract

The invention provides a new boundary calculation method for a visible light communication multiple access channel capacity region, and provides a new inner boundary and a new outer boundary of the multiple access channel capacity region in a visible light communication network under the constraint of a peak value and average optical power. In particular, the proposed inner bound is established byimplementing an input profile for each user using a single user capacity. The proposed external boundaries are derived by determining a single user capacity for each user and relaxing the input constraints to calculate a sum capacity upper limit. Numerical results show that the proposed new boundary is very tight, and is superior to existing boundaries over the wide area of SNR.

Description

Technical field [0001] The invention relates to a new boundary calculation method for visible light communication multiple access channel capacity area. Background technique [0002] As one of the key technologies of 5G communication, Visible Light Communication has attracted the attention of scholars at home and abroad due to its abundant spectrum resources. VLC technology can complement the traditional radio frequency technology. Through the transmitter light-emitting diode, the VLC system can not only illuminate and communicate at the same time, but also has the advantages of ultra-low electromagnetic radiation, high transmission safety, and high energy efficiency. The multi-user scenario in the wireless communication network can be modeled as a multiple access channel (MAC). Therefore, the channel capacity of MAC can characterize the achievable rate of users with limited conditions. Therefore, the channel capacity of MAC can also be used as other The theoretical basis of VLC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/116H04B17/318
CPCH04B10/116H04B17/318
Inventor 马帅王婧张凡贺阳李世银
Owner ZHONGTIAN BROADBAND TECH
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