Network transmission scheme based on joint of VLC (Visible Light Communication) and WiFi

A technology of network transmission and scheme, applied in the direction of transmission system, network topology, free space transmission, etc., can solve the problems of lack of uplink and downlink communication feedback mechanism, in-depth research on handover communication, etc.

Inactive Publication Date: 2016-05-04
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing work has only done a simple feasibility analysis, but there is no substantive in-depth exploration, and no in-depth research on handover communication when downlink visible light communication is blocked, and there is a lack of feedback mechanism for uplink and downlink communication.

Method used

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  • Network transmission scheme based on joint of VLC (Visible Light Communication) and WiFi
  • Network transmission scheme based on joint of VLC (Visible Light Communication) and WiFi

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Embodiment Construction

[0014] Attached below figure 2 The technical scheme of the present invention is described in detail:

[0015] Step 1. The downlink sending and receiving module respectively sends the visible light test signal and the wireless test signal. A fixed sequence of 0011011 can be sent cyclically as a test;

[0016] Step 2. The uplink sending and receiving module detects the intensity and bit error rate of the received visible light signal and wireless signal, and sends the two kinds of signal quality information to the downlink sending and receiving module. Measure and calculate the signal strength RSRP (ReferenceSignalReceivingPower) and bit error rate BER (BitErrorRatio) according to the received fixed test sequence, and send it to the downlink sending and receiving module;

[0017] Step 3, the downlink sending and receiving module can judge whether visible light can be used for communication according to the signal strength RSRP (ReferenceSignalReceivingPower) and bit error rat...

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Abstract

The invention discloses a network transmission scheme based on joint of VLC (Visible Light Communication) and WiFi. The following improvements are made on an existing visible light network transmission scheme: a VLC and wireless local area network joint transmission mode is supported; a wireless communication and VLC switching function is provided; signal transmission is controlled and switched through a wireless local area network technology; and high-speed data transmission is performed through a VLC technology. The network transmission scheme comprises the following steps that: when signal quality of a downlink VLC signal declines or data transmission is interrupted due to movement or shielding and the like of a user location, an uplink transmitting-receiving module feeds back detected signal quality to a downlink transmitting-receiving module, and the downlink transmitting-receiving module can switch a downlink signal transmission mode from a VLC way to a wireless local area network way; and when shielding disappears, the VLC way is switched back to perform downlink transmission. Through adoption of the network transmission scheme, indoor wireless communication can be performed by switching between the wireless local area network technology and the VLC technology, so that the performance of indoor wireless communication can be enhanced greatly.

Description

technical field [0001] The invention relates to a network transmission scheme based on the combination of VLC and WiFi, and belongs to the fields of visible light communication, wireless and access networks. Background technique [0002] Visible light communication (VLC) is an indoor communication system that uses light-emitting diode (LED) lighting as the signal transmission source, which can provide network access while lighting. The VLC system uses carrier modulation and other methods to load the signal on the power line, and after being filtered out by the filter at the front end of the LED lamp, it is converted into a DC signal and loaded to the LED light source. The light emitted by the LED reaches the receiving terminal after being transmitted through the indoor space. The detector converts the optical signal into an electrical signal, then amplifies, shapes and judges, recovers the digital signal and transmits it to the user terminal to complete the downlink communic...

Claims

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Application Information

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IPC IPC(8): H04B10/116H04B1/40H04W84/12
CPCH04B10/116H04B1/40H04W84/12
Inventor 沈建华严超
Owner NANJING UNIV OF POSTS & TELECOMM
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