Research And Implementation Of Physical Layer Network Coding For Wireless Relay Cooperative System

Along with rapid development and increasing fusion of the mobile communication, data services and mobile Internet, due to the roaring growth of the user number and ceaseless rise of transmission quality requirement, how to ensure the safety and reliability of the wireless link transmission and improve the efficiency of existing wireless available resources, has become one of the important issues in wireless communication research areas.The relay cooperative technology and network coding technology arise at this moment. Relay coordination technology ensures the reliability of the wireless link. Network coding makes the network performance reach max-flow transmission theory limit and it can also balance link load, improve the network throughput, reduce energy consumption, enhance network fault tolerance and robustness etc. In addition, network coding realized in the physical layer can effectively reduce the transmission delay and improve the system frequency spectrum efficiency.In this paper, at first the basic concepts of wireless cooperation relay transmission technology and network coding technology are reviewed. We also introduce constructing method and capacity performance analysis.Then on the basis of the concept of physical network coding, several existing physical layer network coding technologies and two kinds of classic relay system channel models, we put forward a new physical layer network coding of multiuser joint modulation based on the soft information, and make the analysis of system outage probability and simulation compared with other network coding.After studying several realizations of the joint network and channel coding design, we propose a joint network channel coding scheme taking advantage of convolutional turbo coding characteristics of double inputs, which wins the extra reliability gain, here we state the system model and operational process in detail.Finally, the paper also expounds the verifiable realization of physical layer network coding scheme on PC7205hardware platform based on the picoArray processor, including system design, modification proposal and process details. We propose a test scheme and get the performance result.