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This paper presents a novel algorithm with IDMA (Interleave Division Multiple Access) scheme to resolve the anti collision problem for RFID (Radio Frequency IDentification). IDMA which can be regarded as a special case of CDMA (Code Division Multiple Access), allows a very simple chip-by-chip iterative detection strategy which cost (per tag) is independent of the tag's number. Moreover, it allows the use of detectors with moderate complexity. Simulation results demonstrate that this system provides an improvement in performance in terms of Bit Error Rate (BER) in dense scenarios (large number of tags) and it offers an efficient alternative to systems with classical spreading sequence.
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