Virtual Cooperation for Throughput Maximization in Distributed Large-Scale Wireless Networks

A distributed wireless network with [inline-graphic not available: see fulltext] links is considered, where the links are partitioned into [inline-graphic not available: see fulltext] clusters each operating in a subchannel with bandwidth [inline-graphic not available: see fulltext]. The subchannels are assumed to be orthogonal to each other. A general shadow-fading model described by the probability of shadowing [inline-graphic not available: see fulltext] and the average cross-link gains [inline-graphic not available: see fulltext] is considered. The main goal is to find the maximum network throughput in the asymptotic regime of [inline-graphic not available: see fulltext], which is achieved by: (i) proposing a distributed power allocation strategy, where the objective of each user is to maximize its best estimate (based on its local information) of the average network throughput and (ii) choosing the optimum value for [inline-graphic not available: see fulltext]. In the first part, the network throughput is defined as the average sum-rate of the network, which is shown to scale as [inline-graphic not available: see fulltext]. It is proved that the optimum power allocation strategy for each user for large [inline-graphic not available: see fulltext] is a threshold-based on-off scheme. In the second part, the network throughput is defined as the guaranteed sum-rate, when the outage probability approaches zero. It is demonstrated that the on-off power scheme maximizes the throughput, which scales as [inline-graphic not available: see fulltext]. Moreover, the optimum spectrum sharing for maximizing the average sum-rate and the guaranteed sum-rate is achieved at [inline-graphic not available: see fulltext].