Analog Network Coding for Multi-User Spread-Spectrum Communication Systems

摘要

This work presents another look at an analog network coding scheme formulti-user spread-spectrum communication systems. Our proposed system combinescoding and cooperation between a relay and users to boost the throughput and toexploit interference. To this end, each pair of users, $\mathcal{A}$ and$\mathcal{B}$, that communicate with each other via a relay $\mathcal{R}$shares the same spreading code. The relay has two roles, it synchronizesnetwork transmissions and it broadcasts the combined signals received fromusers. From user $\mathcal{B}$'s point of view, the signal is decoded, andthen, the data transmitted by user $\mathcal{A}$ is recovered by subtractinguser $\mathcal{B}$'s own data. We derive the analytical performance of thissystem for an additive white Gaussian noise channel with the presence ofmulti-user interference, and we confirm its accuracy by simulation.