Long Keping

Performance analysis for amplify-and-forward relay selection with outdated channel state information

The impact of outdated Channel State Information (CSI) on the performance of relay selections, including the partial relay selection and the best relay selection, is studied, with respect to Amplify-and-Forward (AF) mode cooperative systems. The proposed method is analysed by deriving the asymptotic closed-form expressions for some figures of merit such as the outage probability and the Symbol Error Probability (SEP). Moreover, the validity of the proposed theoretical analysis is proven via simulations. Numerical results prove that the performance of the proposed scheme is impacted considerably by various parameters such as the number of candidate relays and the end-to-end Signal-to-Noise Ratio (SNR). In the presence of cooperative networks with outdated CSI feedback, a performance improvement of more than 3 dB in terms of either outage probability or SEP can be observed by utilizing the Source-to-Destination (S→D) link rather than the method of simply increasing the number of relays.

Study on Disease Screening and Monitoring System Based on Wireless Communication and IOT

This paper presents a disease screening and monitoring telemedicine system based on wireless communication and the Internet of Things(IOT) aiming at building a people-oriented and ubiquitous telemedicine environment . This paper focuses on the system architecture and key technologies, as well as the implementation method, in order to provide a theoretical and technical basis for further demonstration projects.