utilizing physical layer information to improve rfid tag

2. Anti-collision with enhanced tag estimation. Table 6.2 lists the simulation re-
sults when the tag population is estimated using data extracted from the colli-
sion waveform.
3. Anti-collision with RN16 decoding using current protocol. Table 6.3 contains
results for this algorithm in which RN16 decoding is used and one of the tag is
correctly identified in a collision.
4. Anti-collision with RN16 decoding using modified protocol. Table 6.4 list the
simulation results for the anti-collision algorithm which is a modified version
of the ISO18000-6c protocol. This algorithm adds another command to the
protocol which allows the reader to acknowldege more than one tag during
one slot. On receipt of this command, a tag which sent its RN16 but did not
receive a valid acknowledgement waits for the next slot. The remaining tags do
not decrement their slot counters during this additional slot. This significantly
boosts the efficiency of the algorithm.
Table 6.1. Results for Normal anti-collision algorithm (A)
Q value Tags Identified Actual Tags remaining Estimated Tags Remaining
5 12 38 30
5 12 26 22
5 12 14 14
4 3 11 8
3 1 10 8
3 6 4 4
3 2 2 2
3 2 0 0
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