| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 95 === In this thesis, we propose a new anti-collision algorithm: Spread Partial-Q Slot-Count (SPSC) algorithm which contains a novel multiple access method, Passive power division multiple access (Passive-PDMA) systems for Radio Frequency Identification (RIFD) systems to enhance identification rate. We use the way of “Signal Processing” and “Signal Communication” to improve the performance of the anti-collision algorithm. It has different aspects with existing anti-collision algorithms now.
We observe that the throughput of the present anti-collision algorithms in RFID systems is still below the reference value 1/e since the reader can not identify tag’s packets in tag-collisions. In order to improve throughput efficiently, we adopt interference cancellation schemes and intentionally introduce disparate power level into tags in Passive-PDMA systems to enhance the detection of a tag’s signal in the tag-collision. In Passive-PDMA systems, we partition tags into multiple groups with different power levels according the received power level of the reader to enhance the detection ability of interference cancellation. Thus, SPSC algorithm enables the faster identification and yields much higher throughput.
In this work, we analyze the performance of SPSC algorithm with various numbers of tags, and compare with some existing anti-collision algorithm. Simulation results validate the excellent features of SPSC algorithm.
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