## A.1. 802.11a/b WLAN SystemsWe start the derivations by revisiting the interference scenario considered in Figure 4-2, where a WLAN node is surrounded by several UWB transmitters in a two-dimensional setting. The scenario is reproduced here as Figure A-1. The inner circle defines the boundary of a UWB-free zone; that is, no UWB transmitters are closer to the victim than R ## Figure A-1. The interference scenario considered: a WLAN node placed among UWB transmitters in communication with an access pointIf we now let R Equation A-1 where r is the UWB density in users/m Equation A-2 N Equation A-3 Here we have defined M such that Equation A-4 Therefore, any increase of M dB due to UWB interference will result in an equal decrease in the SINR. Hence, if we assume that the system can support a degradation of M dB in SINR, we can deduce the total amount of UWB interference corresponding to an M dB degradation such that Equation A-5 We have also found a general value for UWB Interference as a function of the UWB transmitter density from R Equation A-6 with Equation A-7 and P Equation A-8 Therefore, we can evaluate the permitted UWB density for different decreases in the SINR and estimate effects due to an introduction of UWB devices on IEEE 802.11a/b WLANs. |

Ultra-Wideband Communications: Fundamentals and Applications

ISBN: 0131463268

EAN: 2147483647

EAN: 2147483647

Year: 2005

Pages: 93

Pages: 93

Authors: Faranak Nekoogar

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