Analog Network Coding of Spreaded Signals with Packet Combining

摘要

This paper is another effort of combining network coding and channel coding to achieve improved reliability of network coding in wirel ess sensor network. We propose a scheme of Analog Network Coding (ANC) with Simple Packet Combining (SPaC) where SPaC acts as the method of improving error rate performance of ANC. Orthogonal spreading sequences are used in integrating SPaC into ANC where The orthogonality of spreading sequences ensures the separability of information and their parities for Simple Packet Combining to work. Simulations under AWGN and Rayleigh Fading-AWGN channels have shown that error rate performance is improved for proposed scheme compared to conventional XOR-based Physical Network Coding (PNC). Coding gain in error rate performance increases for stronger error corre cting codes, e.g. Reed-Solomon codes. Error performance of proposed scheme also greatly improves with increasing spreading sequence lengths, as expected.