Known Interference Cancellation: Resolving Collisions Due to Repeated Transmissions

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Executive Summary

Reception of duplicate packets by a node in a wireless network is a common occurrence. Reasons for repeated transmissions range from broadcast flooding to multicast streaming to unicast forwarding. These repeated transmissions may also get involved in collisions like other original transmissions. The authors argue that when one of the colliding packets is previously overheard, its interference can be cancelled to decode the other packet. In other words, when a receiver overhears a packet, it becomes effectively immune to the interference caused by the packet's subsequent transmission. They refer to this as Known Interference Cancellation (KIC).In this paper, they identify the scenarios in which KIC is applicable.

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