Figure 5

Outage probabilities of 900 MHz monopoles. Outage probabilities of the on-body RFID system operating the 900 MHz monopoles: The outage probabilities of the forward link and the backward link are plotted for all four on-body links versus their respective gain thresholds (solid lines: forward link, dashed lines: backward link). The outage probability of the forward link can be found by plotting the CDF of the measured channel gain of the forward link, P_F=P{|S₂₁|²≤F_Th}. The gain threshold of the forward link, F_Th, is defined as the minimum channel gain that is necessary to initiate the chip’s data transmission. The outage probability of the backward link can be found by plotting the CDF of the product of the measured channel gains in forward and backward links, P_B=P{|S₂₁|²|S₁₂|²≤B_Th}. The gain threshold of the backward link, B_Th, is defined as the minimum channel gain of the forward and backward links that is necessary to correctly receive the tag’s data.