backscatter-security

This file contains backscatter data read, data decode, data trace, data cut and define;

data_read

Represents we plot the figures using matlab according to backscatter data from USRP;

data_decode

Represents backscatter data decoding at received end. Here, we sent data series "01010011", I have ploted the decoding figures using square wave;

data_trace

Represents the data trace when we moving the attenna on body;

data_cut

Represents we cut the backscatter data according to the data trace. Here, I used the slope of the trace to determine the states of the antenna. If the slopes have large changes, it means that we have moved the antenna.

define

Represents the function that can determine whether the received data is from on-body tag or not. Here I use the threshold as 4db which cite from the paper "Analytical Propagation Modeling of BAN Channels Based on the Creeping-Wave Theory".

Attention

In this file , when using define.m, I have to use the data type as "double", because these data files is from the oringinal data after cutting.