Networking

Superposition Coding for Wireless Butterfly Network With Partial Network Side-Information

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Executive Summary

Although the 2-source wireless Butterfly Network (BN) represents a natural extension of the well-known 2-Way Relay Channel (2-WRC) scenario, a direct implementation of conventional Wireless Network Coding (WNC)/Physical Layer Network Coding (PLNC) principles in this network is not straightforward. While the information necessary for decoding of the desired data from WNC-coded data at each destination is naturally available in 2-WRC, in the BN the destinations can obtain such information only by overhearing the wireless transmission from the unintended source. Since the amount of such received "Network" Side-Information (N-SI) would be limited by the quality of the corresponding source-destination link, the assumption of perfect side-information is no longer valid in BN, rising many novel research challenges for the design of WNC-based BN.

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