Networking

On Indexing of Lattice-Constellations for Wireless Network Coding With Modulo-Sum Decoding

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Executive Summary

The authors consider wireless (physical-layer) network coding 2-way relaying where both terminals use constellations curved from a common lattice structure and the relay node decodes modulo-sum operation of transmitted data symbols at the multiple-access stage. Performance of such a system with additive white Gaussian noise is strongly determined by used constellation indexing. For some indexing, the minimal distance of modulo-sum decoding is 0 (some points of super imposed constellation are equal despite corresponding to unequal modulosum of data symbols) which causes considerable loss in alphabet constrained capacity.

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