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
Outline Introduction 1 PLiFi 2 Preliminary Results 3 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
Introduction Outline Introduction 1 PLiFi 2 Preliminary Results 3 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
Introduction Background Visible Light Communication (VLC) Unlicensed spectrum from 390 THz to 800 THz 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
Introduction Challenges LED to Internet Connectivity Most researcher focus on LED-to-receiver without considering how the LED connecting to Internet. Internet 0101...000 LED 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
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
PLiFi Outline Introduction 1 PLiFi 2 Preliminary Results 3 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
PLiFi PLiFi PLiFi architecture for augmenting existing WiFi networks. Power Internet distribution network Reuse power line as backbone Ethernet-PLC Modem Ethernet-PLC modem as bridge between WiFi and VLC network. PLC-VLC VLC AP Modem PLC network connected to LED VLC through PLC-VLC modem (a) Single WiFi AP case 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
PLiFi 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 Power Internet Ethernet-PLC distribution Modem network Aggregation Controller switch Ethernet WiFi AP Power line PLC-VLC VLC AP Modem LED (b) Enterprise networking case 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
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 PLC (OFDM) to HomePlug AV2 VLC Maximum 1.2 (On-Off-Keying) Gbps 20 MSPS ZyXEL PLA5405 Beaglebone Black 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
PLiFi PLiFi Design VLC Transmission Schemes Individual Transmission: exclusive use of each LED Joint Transmission: coordinated and synchronized transmission among multiple LEDs. Individual Transmission Joint Transmission Tx/Rx LED Photodiode 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
Preliminary Results Outline Introduction 1 PLiFi 2 Preliminary Results 3 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
Preliminary Results Power Line Network Setting Ethernet-PLC modem: ZyXEL PLA5405 University building with an area of 1300 square meters. Server Client C1 (Mbps) 400 - 500 300 - 400 200 - 300 100 - 200 50 - 100 10 - 50 0 - 10 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
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 PLC-Ethernet adapters Power supply WiFi router (controller) LED BeagleBone 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
Preliminary Results Tx and Rx Luminous Path Loss( L L ) L L = ( m + 1 ) A cos α cos m β (1) 2 π D 2 Transmitter LED Irradiation angle D : distance between FOV transmitter and receiver Distance (D) Area α : incident angle Incident Light angle sensor β : irradiation angle Receiver 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
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 1 1 1 Distance = 1m Distance = 1 m Irradiation angle = 0 o Irradiation angle = 0 o Incident angle = 0 o Incident angle = 0 o 0.8 0.8 Normalized RSS 0.1 Normalized RSS Normalized RSS 0.6 0.6 0.01 0.4 0.4 0.2 0.001 0.2 0 PD 1 Observed Observed PD 2 Theoretical Theoretical Theoretical 0.0001 0 0 0.5 1 1.5 2 2.5 3 3.5 4 0 10 20 30 40 50 60 70 80 90 0 10 20 30 40 50 60 70 80 90 LED (Tx) to Sensor (Rx) Distance (meters) Irradiation angle ( β ) Incident angle ( α ) (a) (b) (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
Preliminary Results Transmission Schemes SINR measured at 16 locations (4 ft . × 4 ft grid) A as transmitter while B as interferer. 2.5ft 2.5ft 1ft 1ft 1ft A B P1 P2 P3 P4 11dB 10% 10dB 11% 7dB 25% 3dB 86% 1ft SINR decreases sharply when receiver moves from A to B P5 P6 P7 P8 11dB 9% 6dB 29% 3dB 74% 9dB 15% 1ft SINR increases significantly under joint transmission P9 P12 P10 P11 9dB 13% 8dB 21% 4dB 45% 3dB 43% 1ft P14 P15 P16 P13 SINR (dB) JT (%) 7dB 11% 8dB 21% 4dB 44% 2dB 61% 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
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
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
Preliminary Results Thank you! Pengfei Hu, Parth H. Pathak, Aveek K. Das, Zhicheng Yang, Prasant Mohapatra (UC, Davis) PLiFi: Hybrid WiFi-VLC Networking using Power Lines VLCS 2016 20 / 20
Recommend
More recommend
