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The operation of multiple RFID readers in close proximity results in interference between the readers. This issue is termed the reader collision problem and cannot always be solved by assigning them to different frequency channels due to technical and regulatory limitations. The typical solution is to separate the operation of such readers across time. This sequential operation, however, results in a long delay to identify all tags. The authors present a Bit Level Synchronized (BLSync) MAC protocol for multi-reader RFID networks that allows multiple readers to operate simultaneously on the same frequency channel.
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