Robust scalable physical layer network coding

We present a new method of physical layer network coding that transforms the received signal at a relay node before re-transmission by eliminating the unreliable components of the signal. This approach improves the physical layer network coding performance, since only reliable components of the signal are amplified and retransmitted. It also lends itself to a robust and scalable implementation. Simulation results show that the proposed robust scalable physical layer network coding can provide 1 - 2[dB] and 4 - 14 [dB] more coding gain than analog network coding and algebraic network coding schemes in a multi-layer wireless network, respectively, and performs more reliably in a network where there is more noise to remove.