Cooperative Localization in Wireless Powered Communication Network

Large scale location management in wireless powered communication networks (WPCNs) can benefit the network performance, and it can also provide location based services for IoT applications without maintaining the batteries. However, it is difficult to attain accurate node positions only based on ranging information from anchors. Thus, cooperative localization is an effective way to increase the node positioning accuracy. In this paper, we mainly investigate the performance of cooperative localization in WPCNs, in which the nodes require energy from remote energy access point (E-AP). We firstly analyze the Cramer-Rao Lower Bound (CRLB) for the full connected´ network and the spatial recursive form for a single joint node respectively. Then we propose beamforming schemes to further optimize the cooperative localization performance, which are designed to achieve the minimum localization errors. The simulations demonstrate the highly accurate localization performance of our proposed schemes, which outperform the existing power allocation schemes.