Research On Energy - Constrained Wireless Network Technology

With the development of wireless communication technology and large scale integrated circuit technology, small and deployment-free, netting, and energy supply wireless communication networks have been more and more attention, which are common in small cell networks, relay networks, wireless powered communication networks, etc.. These nodes in the wireless network are generally able to carry out a large scale deployment, the pace of deployment and way of deployment become more and more free, composed of the network can not only provide data services for more users, the future can even provide additional wireless charging services for users. Typically, the transmission power of the nodes in these networks will be limited, so the whole network is an energy-constrained system.First of all, this paper introduces the small cell network technology of 4G mobile communication, and studies the problem of downlink interference suppression in small cell networks. Small cell networks can effectively improve the capacity and spectrum efficiency of wireless communication systems. The deployment of small cell networks overcome the interference between small areas. We should limit the small cell base station transmit power, so the networks are energy-constrained systems. The work mode selection, deployment location and transmission rate of small cell base station are affected. In this paper, the interference between adjacent small cells is suppressed by the transmission power of the downlink of small cells. At the same time, a low complexity subcarrier allocation scheme is used to improve the downlink and rate of the small cell network. Simulation results show that the algorithm proposed in this paper can improve the downlink transmission rate of small cell and effectively control the interference of adjacent small cell.Secondly, this paper introduces the wireless powered communication technology, and combined with the relay network technology, the research of the wireless powered relay network precoding. Wireless powered communication technology can effectively extend the life of the battery in the terminal equipment, and then solve the problem that the network users need to frequently replace the battery. Based on the wireless powered communication technology, the user can use the time division synchronous technology or the power division coupling technology, at the same time sends the information and the energy, carries on the information transmission and the wireless charging to the receiving terminal equipment. Wireless signal in the transmission process, by the impact of the signal fading, transmission loss is generally relatively large. With the relay network technology, it can effectively overcome the signal fading, improve the quality of service and energy gain of wireless powered communication, but it is limited by the actual transmission power of relay, the whole network is a system with limited energy. In this paper, the structure of wireless poweed relay network is proposed, based on the SDR technique and convex optimization theory, a new method for the design of wireless powered relay network is proposed. The simulation results show that the network structure and the precoding method are proposed in this paper to minimize the total power of the relay networks and satisfy the user’s demand for quality of service and energy acquisition.In summary, with the acceleration of energy-constrained wireless network research, based on the latest research results, this paper explores the energy-constrained small cell networks in the interference management, spectrum resource allocation problem, as well as energy-constrained wireless powered relay networks in the network structure and signal robustness of precoding issues.