Measurement Method of Temporal Attenuation by Human Body in Off-the-Shelf 60 GHz WLAN with HMM-Based Transmission State Estimation

Algorithm 1

Procedure for measuring temporal signal attenuation in mmWave WLAN.

input: power observations

output: time series of signal attenuation

  for    do

conduct maximum likelihood estimation of a one-state exponential distribution model and calculate BIC,

conduct EM algorithm in a two-state HMM and compute BIC,

if    then

estimation of the maximum-likely latent variables using Viterbi algorithm

average of for

end if

  end for