PLiFi: Hybrid WiFi-VLC Networking using Power Lines Pengfei Hu - - PowerPoint PPT Presentation

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Oct 07, 2023 133 likes •344 views

PLiFi: Hybrid WiFi-VLC Networking using Power Lines Pengfei Hu Parth H. Pathak Aveek K. Das Zhicheng Yang Prasant Mohapatra University of California, Davis Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC,

SLIDE 1

PLiFi: Hybrid WiFi-VLC Networking using Power Lines

Pengfei Hu Parth H. Pathak Aveek K. Das Zhicheng Yang Prasant Mohapatra

University of California, Davis

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 1 / 20

SLIDE 2

Outline

1

Introduction

2

PLiFi

3

Preliminary Results

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 2 / 20

SLIDE 3

Introduction

Outline

1

Introduction

2

PLiFi

3

Preliminary Results

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 3 / 20

SLIDE 4

Introduction

Background

Visible Light Communication (VLC)

Unlicensed spectrum from 390THz to 800THz provides high achievable data rate. Reuse of existing lighting infrastructure for purpose of communication make it energy efficient. Unable to penetrate wall means less interference and better security

Power Line Communication (PLC)

Utilizing existing power line network for data communication. PLC devices increase 130 million by 2013 since the introduction f HomePlug AV2 standard in 2012. HomePlug AV2 achieves over 1 Gbps of PHY data rate.

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 4 / 20

SLIDE 5

Introduction

Challenges

LED to Internet Connectivity Most researcher focus on LED-to-receiver without considering how the LED connecting to Internet.

Internet

LED

0101...000

Uplink

Current VLC is limited to broadcasting. Devices equipped with high power LED for communication not practical.

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 5 / 20

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Introduction

Challenges continued

Device Mobility

User mobility and device orientation changes can result in misalignment between transmitter and receiver. Blockage between transmitter and receiver.

Interference

Co-channel interference among multiple transmitters. Absence of technique to interconnect and synchronize for Coordinated Multi-Point transmission (CoMP)

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 6 / 20

SLIDE 7

PLiFi

Outline

1

Introduction

2

PLiFi

3

Preliminary Results

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 7 / 20

SLIDE 8

PLiFi

PLiFi architecture for augmenting existing WiFi networks. Reuse power line as backbone Ethernet-PLC modem as bridge between WiFi and VLC network. PLC network connected to VLC through PLC-VLC modem

Ethernet-PLC Modem Power distribution network Internet (a) Single WiFi AP case LED VLC AP PLC-VLC Modem

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 8 / 20

SLIDE 9

PLiFi

Cost-effective way of conneting LEDs. WiFi channel serves as uplink and takes over transmission when no VLC. Power line serves as backhaul for VLC coordinated transmission Scalability for complicated network

Aggregation switch Controller Internet Ethernet-PLC Modem Power distribution network PLC-VLC Modem VLC AP Ethernet Power line LED (b) Enterprise networking case WiFi AP

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 9 / 20

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PLiFi

PLiFi Design

MAC Design

Sending NACK via WiFi uplink for corrupted or lost frame RTS/CTS packets for collision avoidance transmission

Ethernet-PLC and PLC-VLC Modems

HomePlug AV2 Maximum 1.2 Gbps

ZyXEL PLA5405 Beaglebone Black

PLC (OFDM) to VLC (On-Off-Keying) 20 MSPS

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 10 / 20

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PLiFi

PLiFi Design

VLC Transmission Schemes

Individual Transmission: exclusive use of each LED Joint Transmission: coordinated and synchronized transmission among multiple LEDs.

Tx/Rx LED Photodiode Joint Transmission Individual Transmission

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 11 / 20

SLIDE 12

Preliminary Results

Outline

1

Introduction

2

PLiFi

3

Preliminary Results

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 12 / 20

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Preliminary Results

Power Line Network

Setting Ethernet-PLC modem: ZyXEL PLA5405 University building with an area of 1300 square meters.

400 - 500 300 - 400 200 - 300 100 - 200 50 - 100 10 - 50 0 - 10 (Mbps) Server Client C1

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 13 / 20

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Preliminary Results

Visible Light Mobile Network

Setting LED: TCP RL10DR427K with 650 lumens. Ethernet-PLC modem: ZyXEL PLA5405 VLC controller: Beaglebone Black linux board. WiFi router: Asus RT-AC68U with custom firmware

Power supply BeagleBone LED WiFi router (controller) PLC-Ethernet adapters

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 14 / 20

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Preliminary Results

Tx and Rx

Luminous Path Loss(LL) LL = (m + 1)A 2πD2 cos α cosm β (1)

Distance (D) Transmitter LED Receiver Irradiation angle Incident angle Light sensor Area FOV

D: distance between transmitter and receiver α: incident angle β: irradiation angle

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 15 / 20

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Preliminary Results

Relative Positions of Tx and Rx

RSS drops sharply as the distance increases RSS with variation in irradiation angle β following theory RSS with variation in incident angle α dropping faster than theory. Because of field-of-view (FOV) of receiver

0.0001 0.001 0.01 0.1 1 0 0.5 1 1.5 2 2.5 3 3.5 4 Irradiation angle = 0o Incident angle = 0o Normalized RSS LED (Tx) to Sensor (Rx) Distance (meters) Observed Theoretical

(a)

0.2 0.4 0.6 0.8 1 10 20 30 40 50 60 70 80 90 Distance = 1m Incident angle = 0o Normalized RSS Irradiation angle (β) Observed Theoretical

(b)

0.2 0.4 0.6 0.8 1 10 20 30 40 50 60 70 80 90 Distance = 1 m Irradiation angle = 0o Normalized RSS Incident angle (α)

PD 1 PD 2 Theoretical

(c)

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 16 / 20

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Preliminary Results

Transmission Schemes

SINR measured at 16 locations (4ft. × 4ft grid) A as transmitter while B as interferer.

P1 P2 P4 P3 P16 P13 P5 P6 P7 P8 P14 P15 SINR (dB) JT (%) 11dB 10% 10dB 11% 7dB 25% 3dB 86% 11dB 9% 9dB 15% 6dB 29% 3dB 74% 7dB 11% P12 P11 P10 P9 9dB 13% 8dB 21% 4dB 45% 3dB 43% 8dB 21% 4dB 44% 2dB 61%

1ft 1ft 1ft 2.5ft 2.5ft 1ft 1ft 1ft

A B

SINR decreases sharply when receiver moves from A to B SINR increases significantly under joint transmission

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 17 / 20

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Preliminary Results

Research in Progress

Extending PLiFi to combat RSS variation and SINR degradation. Design of integrated PLC-VLC modem High-speed LED front-end with COTS

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 18 / 20

SLIDE 19

Preliminary Results

Questions?

Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 19 / 20

SLIDE 20

Preliminary Results

Thank you!

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