Low complexity and efficient algorithms for Radio-Frequency Identification (RFID) are crucial\nto foster low-cost and energy-saving solutions. With the aim of lowering the complexity of the radio\ncircuitry, and inspired by the superposition codes concept, we propose a novel encoding algorithm\nfor tag-to-reader communication channels of modern RFID systems. We show that the developed\nschemeââ?¬â?despite the simplicity of its hardware realizationââ?¬â?allows a coding gain comparable to\nthe one obtained by the more complex Viterbi decoding of the Miller 4 modulation scheme used\nin the EPC Generation 2 Class 1 RFID standard. Simulation results prove the effectiveness of the\nproposed solution for low-cost tags, under different signal-to-noise ratios (SNRs) and interrogation\ntime durations. Although our numerical evaluation mainly focuses on the EPC Generation-2 standard,\nwe believe that the proposed scheme will also be attractive for future Ultra-wideband RFID systems.
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