In this paper, we present the performance of different broadcast schemes for multihop sensor networks based on mathematical modeling. In near future many applications will demand multicast (Broadcast) communication feature from the sensor networks. This broadcast feature does not use virtual carrier sensing but relies on physical carrier sensing to reduce collision. For this paper, we analyze t...

CSMA (carrier sense multiple access) is random access protocol for multi-user data communication; it was development to be used in wired (Ethernet) systems, and eventually adopted as the main access scheme of wireless LANs. Because of some intrinsic imperfections and unpredictability of wireless channel, pure CSMA system can not completely use the channel resources; the methods offered in the 8...

Wireless Body Sensor Networks (WBSNs) involve a convergence of biosensors, wireless communication and networks technologies. WBSN enables real-time healthcare services to users. Wireless sensors can be used to monitor patients’ physical conditions and transfer real time vital signs to the emergency center or individual doctors. Wireless networks are subject to more packet loss and congestion. T...

In this paper, we present the performance of different broadcast schemes for multihop sensor networks based on mathematical modeling. In near future many applications will demand multicast (Broadcast) communication feature from the sensor networks. This broadcast feature does not use virtual carrier sensing but relies on physical carrier sensing to reduce collision. For this paper, we analyze t...

In this dissertation, we propose that it is necessary to consider wireless neighborhood as a single indivisible entity for congestion control in multi-hop wireless networks. We precisely define this neighborhood for a class of contention-based wireless networks and validate it with three protocols. We design IFRC, an openloop rate-based fully distributed congestion control protocol for multi-ho...

Over the last years research on wireless multi-hop networks has gained momentum. Wireless multi-hop networks come in many different flavors, all having their own characteristics, requirements and specific constraints. While ambiguous definitions of multi-hop networks are used in the literature, we believe that different types of multi-hop networks should be differentiated more clearly. With thi...

There has been a strong trend towards the specification of multi-carrier Coded Orthogonal Frequency Division Multiplexing (COFDM) in the physical layer of emerging high performance Wireless Local Area Networks (WLAN). This trend is based on an alleged combination of enhanced performance and lower terminal complexity. However, in recent years significant advances have been made in the field of s...

Wireless sensor networks are often located in areas where access to them is difficult or dangerous. Today, in wireless sensor networks, cluster-based routing protocols by dividing sensor nodes into distinct clusters and selecting local head-clusters to combine and send information of each cluster to the base station and balanced energy consumption by network nodes, get the best performance ...