| Compared with the traditional relay system transmission,the two-way relay cooperation technology can resist the fading characteristics and instability of the wireless channel,expand the wireless communication range,and have higher throughput.Network coding technology breaks through the limitation of allowing only relay nodes to store and forward data in traditional networks,which can effectively balance network load and increase network robustness.Applying network coding technology to the resource allocation strategy of the two-way relay system can effectively improve system resource utilization,reduce interference between communication links,and increase system stability.Therefore,this paper mainly focuses on the resource allocation strategy of the two-way relay system based on network coding,the main research contents and innovations of the this paper are as follows:1)In the ideal channel environment,the two-slot multiple access broadcast(MABC)system model of the amplifying and forwarding strategy(AF)is analyzed,and the problem of power resource allocation for each node of communication link under single relay cooperation is studied.A power resource allocation scheme(MABC-LM-OPA)based on Lagrangian method is proposed,taking into account the location of the relay node,bandwidth and the total power of the system.The simulation results show that the MABC-LM-OPA scheme proposed in this paper has better performance in terms of system channel capacity than the equal power resource configuration scheme(EPA)and random power resource configuration scheme(RPA).2)Aiming at the MABC multi-relay system model of AF in the presence of interference,the optimal power resource allocation and relay node selection for non-ideal systems are studied.The channel capacity of the communication link of the system model and the optimal power configuration expression of each node are derived.On this basis,an optimal power resource configuration and optimal relay node for the two-way multi-relay system with interference is proposed.Selection strategy(IS-MABC-OPOR),which not only considers theactual environment of signal transmission,but also takes into account the impact of transmission threshold limits on each communication link.The simulation results show that compared with the EPA strategy,RPA strategy and interference comparison strategy,the IS-MABC-OPOR strategy proposed in this paper improves the system stability and has higher channel capacity.3)Aiming at the three-slot time division broadcast(TDBC)system model of AF in the eavesdropping environment,the problem of security power resource allocation for two users by relay nodes in a single-relay cooperative scenario is studied.Aiming at the safe channel capacity of the system,this paper proposes an optimal power allocation scheme(TDBC-AF-OPA)with the TDBC model of the eavesdropping node and the relay node with AF as the forwarding strategy.considering the location of the relay node and relay node transmission power factor.The simulation results show that compared with the no-power resource allocation scheme(PAI)and the random power resource configuration scheme(RPAI),the performance of the scheme proposed in this paper is better. |
