Changes between Version 21 and Version 22 of 802.11/app_notes/FDD-NoMAC
- Timestamp:
- Feb 15, 2017, 12:22:21 PM (7 years ago)
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802.11/app_notes/FDD-NoMAC
v21 v22 386 386 [[Image(Two_Node_Througput_vs_Time.png, width=600)]] 387 387 388 This evaluation took place with RF cabling + attenuatorsconnecting the RFA on the AP to RFA on the STA as well all RFB on the AP to RFB on the STA. Because there is no underlying random access MAC, this FDD implementation is sensitive to interference present in the 2.4GHz and 5GHz channels. Testing over a wire eliminates this interference for the purpose of this study.388 This evaluation took place with RF cabling + 50 dB of attenuation connecting the RFA on the AP to RFA on the STA as well all RFB on the AP to RFB on the STA. Because there is no underlying random access MAC, this FDD implementation is sensitive to interference present in the 2.4GHz and 5GHz channels. Testing over a wire eliminates this interference for the purpose of this study. 389 389 390 390 Recall from [wiki:802.11/wlan_exp/examples/txrx_log_capture the Dual-Node Log Capture Example] that the traffic pattern starts off with a constant bit rate LTG flow from AP to STA. In the middle third of the experiment, another constant bit rate LTG flow from STA to AP is enabled. [wiki:802.11/wlan_exp/examples/txrx_log_analysis#LogProcessThroughputvsTime Normally with the DCF], this second flow splits the sum throughput roughly evenly between the two nodes while the overall sum throughput slightly decreases due to unavoidable wireless collisions. With the FDD design, however, we can see that the presence of the second flow has no impact on the original flow and the sum throughput doubles.