Capacity of Wireless Networks Within O(log(SNR)) - The Impact of Relays, Feedback, Cooperation and Full-Duplex Operation

Recent work has characterized the sum capacity of time-varying/frequency-selective wireless interference networks and X networks within o(log(SNR)), i.e., with an accuracy approaching 100% at high SNR (signal to noise power ratio). In this paper, the authors seek similar capacity characterizations for wireless networks with relays, feedback, full duplex operation, and transmitter/receiver cooperation through noisy channels. First, they consider a network with S source nodes, R relay nodes and D destination nodes with random time-varying/frequency-selective channel coefficients and global channel knowledge at all nodes. They allow full-duplex operation at all nodes, as well as causal noise-free feedback of all received signals to all source and relay nodes.