Transmission Quality:

• The Efficiency and Delay of Distributed Source Coding in Random Access Sensor Networks
• We have analyzed the effect of medium access control (MAC) on the performance of Slepian-Wolf distributed source coding (DSC) in sensor networks. By considering specifically the slotted ALOHA random access protocol, we study the effect of MAC on the throughput, delay, and energy efficiency of DSC. We have proposed and compared several different transmission probability assignment schemes using the performance measures analyzed in this paper. Furthermore, an adaptive MAC protocol is also proposed to improve upon the throughput and delay of the original system.


• Main achievements and outcomes
• Research or technology outcomes
• As far as we know, the random access protocol for distributed source coding in wireless sensor networks has not been studied yet in literature. This work has been presented at IEEE WCNC 2007.

• Link Stability Prediction for Mobile Ad Hoc Networks in Shadowed Environments
• We have proposed a new link stability prediction method based on current link-related or user-related information in shadowed environments. A more realistic user mobility model and a realistic propagation model are taken into consideration. According to the numerical and simulation results, it is found that the proposed method can accurately predict the link stability for different environment and mobility conditions. The prediction results can be regarded as a measure of the link stability, and can be applied to the applications, such as link performance prediction, system performance analysis, service quality prediction and route search. Furthermore, the impact of different mobility information on the accuracy of link stability prediction is also evaluated to assess the importance of the knowledge of mobility information.


• Main achievements and outcomes
• Research or technology outcomes
• This model provides an efficient way to predict the link stability of MANETs, which is an important quality metric for many applications in MANETs. This work has been presented IEEE Globecom 2006.