Detection of shadow fading in wireless networks

In this paper, new approaches are used to detect the occurrence of shadow fading using multiwavelets and slantlet transforms to decompose the signal strength trace and observe the presence or absence of shadow fading by measuring the variations in the slope of the decomposed signal coefficients when considered as a function of scale in log-log plot. The goal of proposing new approaches is to enhance the detection process considering both the computational complexity and accuracy. Simulations that carried out on 16-QAM, OFDM and CDMA systems have shown that the proposed approaches can be used in the detection of shadow fading and a comparison between the proposed approaches and the previous wavelet approach shows that the multiwavelets approach performs the detection process with higher speed and lower probability of missed detection than the wavelet and the slantlet approaches.