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Two new schemes are proposed for collision resolution in slotted ALOHA networks based on Multi-User PHYsical-Layer Network Coding (MU PHY NC). In the proposed random access schemes, a collision of a generic number of packets can be recovered decoding the XOR of the original messages, such that the signal resulting from the collision is exploited rather than being discarded. Two different schemes that differ in terms of the amount of control information that needs to be transmitted from the access point, are studied.
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