1. Dense Reader: Theory, Details & Experience Kevin Powell Symbol Technologies

2. RFID Spectral Analysis: Reader in modulation Reader in modulation

3. RFID Spectral Analysis: Tag & Interfering reader signals Reader in CW Tag Backscatter Distant reader in modulation Interference

4. Possible solutions Channelization / Band plan (detail follows) –Regulatory impact –Coordinated plan in each location Time synchronized reader modulations –Synchronized to several microseconds difficult –Regulatory discouraged Time synchronized reader transmissions –Easiest implementation –Least efficient bandwidth use Common Theme – Readers Need Coordination

5. Interference Channelization: Uncoordinated Readers Readers in modulation Tag Backscatter Reader at Fast data rate

6. Single Channel Spectral Target Reader in CW Tag Backscatter Distant reader in modulation No interference, Data comm.s

7. Single channel experience Currently deployed RFID standard operated in single channel mode Characteristics: –10-20 readers on per site, not synchronized –All readers operate single fixed channel –Minimal reader distance separation –Multiple installed applications, sites. Results – no loss of read performance

8. Summary New standards provide opportunities for RFID, but also provide new issues. New RFID issues include a need for reader to reader coordination and standardization. Industry best served by standards body with multi-device management experience.