Symbol	Description
$TA{G}_i$	Bracelet of person i
$L_i(t)$	List of RSSI values of $TA{G}_i$ received from all antennas at time t
$C{P}_i(t)$	Candidate position of $TA{G}_i$ at time t
$S{P}_i(t)$	Selected position of $TA{G}_i$ at time t
$P(S{P}_i(t))$	Likelihood that the $TA{G}_i$ is in $S{P}_i$ at time t
$P_{entry}$	Initialization value of likelihood for each $TAG$
$P_{delta}$	Constant value added or removed to the likelihood
$P_{min}$	Likelihood threshold: under this level, wall crossing is allowed