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Wireless sensor networks provide distributed sensing and processing to a wide range of applications that operate in different environments. To be able to perform their intended duties, one of which is relaying information to other nodes in the network, a routing protocol is needed. One possible building block in a routing algorithm is to use a flooding(More)
The purpose of this project is to integrate the technologies of wireless sensor networks and public communication networks to construct a healthcare system for senior citizens at home without interfering their daily activities. This system provides 4 main functionalities, including indoor monitoring, outdoor monitoring, activity and health state decision,(More)
In this paper, techniques of Reed–Solomon (RS) codes to recover lost packets in digital video/audio broadcasting and packet switched network communications are reviewed. Usually, different RS codes and their corresponding encoders/decoders are designed and utilized to meet different requirements for different systems and applications. We incorporate these(More)
Using Wireless Sensor Networks (WSNs) in health care system has yielded a tremendous effort in recent years. However, in most of these researches, tasks like sensor data processing, health state decisions making and emergency messages sending are completed by a remote server. Transmitting and handing with a large scale of data from body sensors and home(More)
The application scenarios of wireless sensor networks for health care systems are very complex, which require a new communication scheme that can dynamically fulfill these requirements and achieve efficient data transmission. It brings a big challenge to routing, access control, data transmission, storage and processing. This paper presents a novel routing(More)
We present a simple, but effective, packet combined ARQ scheme for multi-level modulation schemes such as MPAM, MPSK and MQAM. We propose an ARQ scheme that rearranges the symbols between different transmissions and also uses the modulation level, M, as an extra dimension to improve the quality of the signal and reduce the number of retransmissions per(More)