Cross-Layer Control Strategy of Distributed Routing in Cognitive and Cooperative Ad Hoc Networks
Huazhang Liu · Journal of Naval Aeronautical and Astronautical University · 2011
Throughput maximization is a key challenge in cognitive radio ad hoc networks.To achieve this objective,cooperative transmission is a promising technique to increase the capacity of relay links by exploiting spatial diversity without multiple antennas at each node.This idea is particularly attractive in wireless environments due to the diverse channel quality and the limited energy and bandwidth resources.In this paper,decentralized and localized algorithms for joint dynamic routing,relay assignment,and spectrum allocation in a distributed and dynamic environment were proposed and studied.A cross-layer protocol to implement the joint routing,relay selection,and dynamic spectrum allocation algorithm was also introduced,and its performance was evaluated through simulation.Performance evaluation results showed the proposed protocol achieved much higher throughput than solutions that did not rely on cooperation.