Fig. 5
From: Coherent query scheme for wireless backscatter communication systems with single tag
Average BER curves for cascaded backscatter channels with independent, Rayleigh fading in forward and backscatter links. Un-coded BPSK modulation with coherent detection in the presence of AWGN noise is applied. Each curve represents the average BER of the signal at the n-th receiver with and without diversity. a Normalized total transmitted power with M transmitters (diversity gain and antenna array gain are represented). b Normalized BER to constant EIRP (diversity gain due to the altered channel statistics is illustrated)