Research On Resource Optimization In Cooperative Anti-jamming Multi-hop Ad-hoc Networks

The wireless self-organizing(Ad-Hoc)network plays an important role in the future mobile communication network under the scenario of infrastructure-less communication with dynamic adaptability and viability.However,because of its distributed and energy limited characteristics,wireless Ad-Hoc networks are very vulnerable to interference.In wireless Ad-Hoc networks,if there is a interference source that generates random interference signals to legitimate users,the communication between legitimate users will not be carried out normally.Therefore,we used clustering multi-hop wireless Ad-Hoc network as the research object.In order to improve anti-jamming ability,energy efficiency and the utilization rate of network nodes,we proposed the anti-jamming network framework based on cooperation,the network optimization optimization power allocation and relay selection strategy.First,we proposed a cooperative communication based on anti-jamming strategy.With the usage of antenna nodes around the sending and receiving node,which form virtual multi-antenna terminal,we proposed a virtual multiple input multiple output(VMIMO)transmission structure,to win diversity gain,so as to improve the communication capacity of the source node to the destination node.Based on this strategy,we discussed the optimal power allocation strategy to minimize the outage probability at the destination node.Considering the transmission process of three hops,we divided the optimization problem into two parts.The first one deals with the power allocation problem from source node to one-hop relays,and the second subproblem deals with the power allocation problem of two-hop relays to the destination node.By transforming the optimization goal into the upper bound of outage probability,we reduced the complexity of the optimization problem,and used distributed computing to get the optimal resource allocation of relay and source nodes.Finally,the simulation results proved the effectiveness and robustness of our proposed anti-jamming strategy,and the efficiency of resource utilization under the condition that the power of cluster sub-nets is limited.Besides,due to the large number of nodes in the wireless Ad-Hoc network and the limit-ed number of cooperative transmission,the relay selection strategy under multi-hop cooperative transmission is the second aspect of our research,including the one hop relay selection problem and the two hop relay selection problem.In order to maximize the received signal-to-noise ratio(SNR)at the destination node,we first assumed that the two-hop relays are given,the search algo-rithm based on greedy algorithm to determine one hop relays’ set.Then,with a certain standard,the candidates of the two-hop relays can be selected.We have established two standards based on weighted channel and location information,and used these two standards to simulate the re-lay selection performance in cooperative multi-hop network.We compared the receiving outage probability with the cooperative relay selection strategy and the outage probability in the case of non cooperative and no relay selection,and illustrated the performance gains of cooperative relay selection.