On the ergodic throughput capacity of hybrid wireless networks over fast fading channels

In this paper, we investigate the theoretical per-node transmission limit of hybrid wireless networks over fast fading channels. We first formulate a hybrid wireless network model, in which a wired network of base stations is deployed to support long-range communications between wireless nodes. Two types of transmission mode in hybrid wireless network, the so called intra-cell transmission mode and the infrastructure transmission mode are considered. In this study, we define a feasible ergodic throughput capacity as the criterion for throughput performance analysis. To effectively overcome the fast fading impairments, we introduce an optimal multiple access technique allowing opportunistic sources to transmit concurrently with the scheduled source. A successive interference cancelation (SIC) strategy is then applied at the receiver to limit the intra-cell interference and achieve the maximum throughput. In addition, the frequency reuse scheme is employed to minimize the intercell interference. Finally, we derive closed-form analytical expressions for the ergodic throughput capacity and further explore the scaling laws for the ergodic throughput capacity at low signal-to-interference-plus-noise ratio (SINR) and high SINR scenarios, respectively. The theoretical bounds obtained are instrumental to the future energy-limited network modeling and design.