Research On The Wireless Cooperative Communication Systems Based On Network Coding

Network coding is a promising technique designed to reach the Min-cut Max-flow capacity and has been receiving widespread attention in academia and industry. Research results show that network coding can provide further higher network throughput, robustness, balance the traffic as well as security for wireless cooperative communication systems. In recent years, the physical layer network coding (PLNC) has been becoming research focus in wireless cooperative communication systems.Combining with the research achievements and research methodology available, this dissertation will be aimed at the wireless signal cover and system capacity promotion problems when adopt cooperative relay technology in the next generation mobile communication systems. Integrating network coding with cooperative relay technology in wireless networks, the wireless network coding schemes in different cooperative relay scenarios and performance analysis are presented. Furthermore, combining with survivability trait, survivability protection strategy based on network coding and the method of survivability model are presented in wireless cooperative communication systems. Several research results are obtained as follows1.The theory research development of the network coding in wireless cooperative communication systems is overviewed. Three types of physical layer network coding—physical network coding over finite field, analog network coding (ANC) and complex field network coding are presented. Their distinguishing feature, research development, new theory and technology related with them are introduced. Furthermore, the Testbed based on analog network coding in wireless cooperative communication systems is listed. The opening issues and challenges for PLNC referring to both theory and implementation in near future are proposed.2.Under the two-way cooperative relay scenario with PLNC, the PLNC modulation and demodulation mapping mechanisms are presented. The optimal power allocation under the goal of minimizing system total power consumption is proposed and analyzed for the two-way cooperative relay with PLNC. Compared with the existing schemes, the proposed scheme can significantly improve system performance and resources efficiency.3.The transmit power allocation of practical ANC scheme for multiple-access relay channel (MARC) is investigated, optimal transmit power allocation under the goal of maximizing the total mutual information is discussed. Furthermore, outage probability and throughput is analyzed under the ANC scheme for MARC. Compared with the existing schemes, the proposed scheme can obtain some performance gain.4.Multiple source-destination sessions sharing the same single relay for cooperative communications employing ANC scheme is described, a detailed analysis for the achievable rate and ANC noise propagation is offered. Furthermore, an improved method of ANC inspired by Tomlinson-Harashima Precoding (THP) is first proposed. Compared with ANC scheme, the proposed scheme can effectively reduce the ANC noise propagation and achieve some performance improvement.5.Combining with network coding, an effective sub-optimal strategy to build survivability protection against single link (path) failure on a specific many-to-one wireless links network topology is presented. Furthermore, take the wireless cooperative communication system—IP multimedia subsystem as an example, the survivability stochastic Petri nets (SPN) model is proposed under the existing model of survivability and performance analysis methodology. Finally, the structural character effect on survivability SPN model soundness is discussed, and useless service failure structure (structural confusion) in survivability SPN model is first presented.