关键词: 机会中继, 中断概率, 空间随机均匀分布, 网络传输容量

Abstract: The authors study the transport capacity and reliability of the wireless ad hoc networks using opportunistic decode-and-forward relaying for cooperative communications when the nodes are randomly and uniformly distributed in space; meanwhile, in order to optimize the network topology, maximizing the transport capacity is applied under the connectivity of the whole networks. In the condition of the path loss and block fading channels, the authors derive the outage probability and transport capacity of the traditional relaying with opportunistic relaying and the incremental relaying with opportunistic relaying. The numerical simulation results show that, although the random distribution of nodes destroys the expected diversity gain offered by relaying nodes, the opportunistic relaying performs better than the direct communication in overcoming the channel fading. While the transport capacity of the direct communication decreases monotonically with the node density and the transmission power, the opportunistic relaying should consider the maximum transport capacity for the network topology optimization.

Key words: opportunistic relaying, outage probability, random spatial uniform distribution, networks transport capacity