A method for reading and tracking radio frequency identification (RFID)
tags in the presence of a noisy air channel is provided. In accordance
with the method, a binary tree data structure is used to characterize a
plurality of RFID tags, each of which is associated with a unique
identification (ID) number. During communication between a tag reader and
one or more RFID tags, the tag reader traverses the binary tree,
eliminating tags from communication until one tag with a unique ID number
is isolated and verified. As the binary tree is traversed, counters
associated with each node in the tree are incremented based on tag
matches, such that, over time, counters associated with nodes in
tag-populated branches will tend to have a high value and counters
associated with nodes in unpopulated tree branches will tend to have low
values. Where the read process is subject to noise and the tag reader is
forced make a decision at a branching node, the tag reader makes a branch
prediction based on the current value of the node counters associated
with each of the possible alternative branches.