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Portal Transmitter Declaration Transmitter IEEE 802.11 Distribution System Access Point uplink downlink Receiver 1.Consider a Transmission Scenario with.

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Presentation on theme: "Portal Transmitter Declaration Transmitter IEEE 802.11 Distribution System Access Point uplink downlink Receiver 1.Consider a Transmission Scenario with."— Presentation transcript:

1 Portal Transmitter Declaration Transmitter IEEE 802.11 Distribution System Access Point uplink downlink Receiver 1.Consider a Transmission Scenario with a group of Receivers 2.Video files are transmitted from the transmitter side, through the AP, and to the receivers. 3.The declaration and handshake processes are not considered Application Scenario

2 Overview of Evalvid

3 1.Encodes function 1.H.263 (ffmpeg, DResearch) 2.MPEG-4 (ffmpeg, XviD) 3.H.264 (x264, JM 10.2) 2.The size of codecs file under 264 is 16413KB 3.Bit-rate 128kbps 4.Frames per second 30FPS 5.An I-frame every second 30GOP 6.Max. packet size 1472 MTU

4 1.Channel: wireless channel 2.Propagation model: tworay ground 3.Physics layer type: wireless pyh extension 4.Mac layer: 802_11extension 5.Queueing method at the interface: priority queue which gives priority to the routing protocol packets 6.Antenna: Omni-directional Antenna 7.Routing protocol: DumbAgent (it means the source and receiver are neighbours which can be touched within one hop) 8.802_11 datarate: 54Mb 9.Application layer traffic setting: packet size 1023 bytes, rate 256Kb

5 802.11a setting CSThresh_ 6.31e-12 ;#-82 dBm Wireless interface sensitivity (sensitivity defined in the standard) Pt_ 0.001 freq_ 5.18e+9 set noise_floor_ 2.512e-13 ;#-96 dBm for 10MHz bandwidth L_ 1.0 ;#default radio circuit gain/loss PowerMonitorThresh_ 1.259e-13 ;#-99dBm power monitor sensitivity HeaderDuration_ 0.000020 ;#20 us BasicModulationScheme_ 0 PreambleCaptureSwitch_ 1 set DataCaptureSwitch_ 0 SINR_PreambleCapture_ 2.5118; ;# 4 dB SINR_DataCapture_ 100.0; ;# 10 dB set trace_dist_ 1e6 ;# PHY trace until distance of 1 Mio. km ("infinty") PHY_DBG_ 0 set CWMin_ 15 CWMax_ 1023 SlotTime_ 0.000009 set SIFS_ 0.000016 set ShortRetryLimit_ 7 set LongRetryLimit_ 4 set HeaderDuration_ 0.000020 set SymbolDuration_ 0.000004 set BasicModulationScheme_ 0 set use_802_11a_flag_ true set RTSThreshold_ 2346 set MAC_DBG 0

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