Analysis &design of Joint Phy-mac Model of Ieee 802.15.4

In Recent years various researches were focused on wireless sensor network (WSN) .IEEE 802.15.4 is the best solution for low-rate, low power, energy efficient wireless sensor networks application especially in industrial and home automation. IEEE 802.15.4 is widely used in ubiquitous networking among different wireless standard. The IEEE 802.15.4 specifies PHY and MAC (media access control) layer for LR-WPAN. IEEE 802.15.4 is widely employed in ubiquitous networking of wireless devices. We review and analyze a joint model of PHY & MAC layer of IEEE 802.15.4[4]. In this paper we present a model of Physical layer of IEEE 802.15.4, it includes path loss model, and this interacts with MAC layer. Our model focus on MAC layer in which multiple non saturated sources/stations try to access channel and communicate with sink. Model is based on Markov chain, and M/M/1/k queuing model. Our analysis at PHY layer performs calculation and find out the probability of good frame reception (SNR) and radio (modulation and coding) parameters. Analysis is more focused on considering packet loss at PHY and MAC levels with concept of transitional region approach [2]. Our analysis also deals with PHY layer implementation of IEEE 802.15.4 using MATLAB/Simulink General Terms-PHY layer including path loss model of IEEE 802.15.4, CSMA-CA protocol Keywords-IEEE 802.15.4,Markov chain modeling, Queuing model, MATLAB model of IEEE 802.15.4, PHY & MAC layer.