Research On Robust Relay Transmission Technology Based On Data Buffering Assistance Under Imperfect Channel Condition

The explosive growth of data traffic in the fifth-generation mobile communication technology has led to greater challenges in wireless communication network research.On the one hand,the rational use of information in the transmission network under the condition of limited network resources to design a transmission scheme with high spectral efficiency.On the other hand,in practical wireless communication scenarios,channel estimation errors due to feedback delays,quantization errors and noise interference are unavoidable problems in wireless communication system design.How to model imperfect channel state information and design information transmission with stable data storage and sustainable energy consumption in the presence of channel estimation errors is a very important issue in wireless communication theory research.Relay technology is widely used because it can expand the transmission range of communication network,but in the traditional relay transmission network relay data reception and information forwarding mode has strong coupling,when resource storage is considered at the relay end,the strong coupling in communication network can be effectively reduced,introducing higher time freedom for the transmission system,and thus improving the transmission efficiency.At the same time,the channel estimation error in the actual communication scenario will affect the effectiveness of information transmission,and the study of wireless transmission scheme under the condition of imperfect channel state information has more practical application value,which has received the attention of many domestic and foreign research scholars in recent years.In this work,buffer-aided relaying is used to solve the problem of robustness of wireless communication in practical application scenarios and to achieve reliable information transmission.At the same time,the existing information in the transmission network is fully utilized to mine the value of storage assistance technology in the design of wireless communication networks.First,to portray the impact of imperfect channel estimation more accurately on wireless relay communications,the paper first considers a novel statistical channel estimation error model that more accurately reflects the degree of imperfection of channel state information in the actual guide Pilot assist channel estimation conditions.Second,based on the newly proposed statistical channel estimation error model,the paper incorporates the channel estimation error explicitly into the design of a buffer-aided wireless relay transmission scheme,which proposes an adaptive buffer-aided wireless relay transmission scheme under imperfect channel state information conditions,based on maximizing the system reachable throughput under data and energy queue stability conditions.The paper analyzes the impact of channel estimation errors on buffer-aided wireless relay transmission schemes.It is demonstrated that a robust buffer-aided adaptive transmission scheme can be obtained by incorporating the channel estimation error explicitly into the design of a buffer-aided wireless relay transmission scheme under the channel estimation error condition.The analysis results of the paper show that the robust buffer-aided adaptive relay transmission scheme still achieves significantly better performance than the non-bufferaided adaptive relay transmission.It is an important reference for designing buffer-aided adaptive relay transmission schemes for practical systems.Third,the paper investigates cooperative multi-relay secure transmission network under imperfect channel state information conditions.For the multiple wireless relays with eavesdropper scenario,the relay is allowed to forward information to the destinat ion using non-orthogonal multiple access when the relay with data and meets the security transmission requirements.Make full use of the spatial gain brought by multiple relays to the wireless communication system to increase the system achievable rate.Maximizing the system security rate with the constraint that the node queue information is stable.In this paper,we propose an adaptive secure transmission scheme with the condition of imperfect channel state information.We analyze the effect of the number of relays on the transmission scheduling mechanism,the tradeoff between the average transmission delay of the system and the achievable safety rate,and the effect of the guide frequency overhead on the achievable rate of the system.In summary,this paper presents an in-depth study of buffer-aided relay networks with imperfect channel state information.We investigate the impact of channel estimation errors on the performance of buffer-aided wireless relay communication systems in practical wireless communication scenarios.It is revealed that incorporating channel estimation error into the design of buffer-aided adaptive relay transmission scheme can obtain robust adaptive relay transmission scheme,which is an important reference machine value for desig ning wireless relay communication systems in real.