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© 2013 Wi-Fi Maritime Communications Using TV White Spaces MsC Dissertation Luciano Jorge Silva Santos Supervisor Manuel Ricardo Co-supervisor Rui Campos
© Wi-Fi Maritime Communications Using TV White Spaces Introduction Current Maritime Communications Context Motivation Previous Work Maritime Environment Outdoor long range link TVWS Propagation modelsContents On going Work Theoretical Results Hardware Scenario Experiments
© 2013 Current Maritime Communications Most common used Technologies HF and VHF bands Satellite connections Low bandwidth and expensive 2G/3G (near the shore) Motivation A need for low cost communications A need for high bandwidth and speed networks Real time data transfers Live VoIP and video surveillance streaming Data exchange between fishing boats 3Wi-Fi Maritime Communications Using TV White Spaces
© 2013Motivation Not viable to install base stations in the high sea Connection range up to 100 Km from the shore Transition to digital television 700 MHz band released by analogic television Longer transmission ranges Better propagation characteristics in comparison with 2.4 GHz and 5.8 GHz No current tests done with this band in maritime environment 4Wi-Fi Maritime Communications Using TV White Spaces
© 2013 Maritime Environment Completely different from land environment Difficult to predict maritime state Frequency propagation over water Surface multipath reflection Wave occlusion Blockage RF signal by near boats Boat rocking motion Continuous changes in the antenna orientation and height These factors provokes Unstable connection Strongly affects signal strength Long delays Increase PER 5Wi-Fi Maritime Communications Using TV White Spaces
© 2013 Propagation model for maritime communications Proposed 2 Ray Path Loss model L = Path Loss dB ht = Transmitter antenna height hr = Receiver antenna Height d= Distance (m) λ = Wavelength Signal reflection on the sea surface (two ray) 6Wi-Fi Maritime Communications Using TV White Spaces ht=hr=18m F=2,4 GHz
© 2013 Outdoor long distance link with TVWS band System configurationSystem configuration Equipment Equipment Mikrotik RB433 router boards Ubiquiti XR7 700 MHz cards 14 dBi Yagi Directional antennas Configurations Tx power: 28 dBm Channel width 5 Mhz b 7Wi-Fi Maritime Communications Using TV White Spaces 18 m50 m7 m Node 1 to 2 Node 1 to 3 Node 2 to 1 Node 2 to 3 Node 3 to 1 Node 3 to Mbps 1.8 Mbps 1.65 Mbps 0.67 Mbps 1.63 Mbps 0.65 Mbps Variation of RSSI between node 1 and 2
© 2013Scenario 8Wi-Fi Maritime Communications Using TV White Spaces ANACOM Restrictions: Max Tx Power: 28 dBm Channel Width: 5 MHz Frequencies between: MHz
© 2013Hardware Hardware 2x Alix 3D3 Pc engine 2x Flash compact cards 2x Ubiquiti XR7 Proprietary 700MHz, based on g OFDM TX Channel Width Support 5MHz / 10MHz / 20MHz Outdoor range up to 50 Km 2x Omni Directional Antenna MHz 3 dBi gain GPS USB 9Wi-Fi Maritime Communications Using TV White Spaces Omni Directional Antenna Ubiquiti XR7 card Alix 3D3
© 2013Experiments Analyse the performance of the 700 MHz link in maritime environment with the following parameters: Range Range – Average distance possible to establish a connection between the land station and the boat Connection throughput Connection throughput – Average bandwidth for different ranges between the land station and the boat. Packet delay and Packet loss Packet delay and Packet loss – Round Trip Time and the percentage of packets loss for different ranges Jitters Jitters - Variation of time between arriving packets RSSI throughput RSSI throughput – Received Signal Strength in dB TCP and UDP tests TCP and UDP tests Analyse the results with meteorological conditions Analyse the results with meteorological conditions 10Wi-Fi Maritime Communications Using TV White Spaces
© 2013 Theoretical Results 11Wi-Fi Maritime Communications Using TV White Spaces Considering following parameters:Considering following parameters: Transmitted: Transmitted: Tx Power: 30 dBm Antenna Height: 20m Antenna gain: 3 dBi Attenuation: 0.94 dB Received: Received: Min Power: -88 dBm Antenna Height: 5m Antenna gain: 3 dBi Attenuation: 0.94 dB Tolerance: 6 dB Max Path loss:Max Path loss: dB Max Distance:Max Distance: 7530 m Fresnel Zone:Fresnel Zone: m
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