Fig. 10
Comparison between estimated and real Pon. a Measurement time = 0.5 s. b Measurement time = 1 s. c Measurement time = 1.5 s. We must calculate the Pon to accurately calculate the interference ratio and the transmission opportunity loss ratio. Therefore, Pon’s estimation must also be accurate. The average on/off cycle of the PU is 0.05 s. The measurement time is 0.5 s in a, 1 s in b, and 1.5 s in c. For each case, the solid line represents the estimated Pon, the dashed line represents the actual Pon, and bar represents the estimation error. a, b, and c indicate that the proposed method accurately estimate the real Pon. As the measurement time becomes longer, the change of the value decreases by the nomalization