On the outage throughput capacity of hybrid wireless networks over fading channels

In this paper, we investigate the problem of how much information can be transported over hybrid wireless networks, in which a wired network of base stations is deployed to support long-range communications between wireless nodes. The main focus of this paper is the effect of fading on such hybrid wireless networks. To effectively overcome fading impairment, we introduce optimal multiple access technique allowing opportunistic sources to transmit concurrently with the scheduled source. All these sources share the entire bandwidth, much like a wideband CDMA system. A successive interference cancellation (SIC) strategy is then applied at the receiver to limit the intra-cell interference and achieve the maximum capacity. Close-form solutions for outage throughput capacity are derived under intra-cell transmission mode and infrastructure transmission mode, respectively. It is showed that, with opportunistic sources, the intra-cell mode effectively combats fading as wireless nodes increases; however, the infrastructure mode is bottlenecked by the downlink transmission since base station is the only transmitter in the cell during the downlink phase. The theoretical bounds obtained and proofs are instrumental to the future network modeling and design.