信標(biāo)模式下ieee802.15.4星型網(wǎng)絡(luò)性能評估

1、華中科技大學(xué)碩士學(xué)位論文信標(biāo)模式下IEEE 802.15.4星型網(wǎng)絡(luò)性能評估姓名：王欣申請學(xué)位級別：碩士專業(yè)：通信與信息系統(tǒng)指導(dǎo)教師：黃本雄20070601IIAbstract IEEE 802.15.4 is a standard introduced for low-rate wireless personal area networks under the demand of low-date-rate applications,

2、 which provides features as low power consumption, low data rate, low complexity, short range, low cost, etc. It mainly fits the low-rate applications, and can be used for a wide variety of applications, such as home aut

3、omation, industrial and agricultural controls, building automation, interactive toys, sensor networks, etc. Thus it enables the realization of ubiquitous networks. This paper first analyzes the development of wireless pe

4、rsonal area networks, as well as the development, application areas and status of current researches on IEEE 802.15.4 protocol, and then studies the key techniques of the protocol, including protocol stack, frequency ban

5、ds and modulation methods of physical layer, main function and protocol data unit format of physical and MAC layers, key parameters and flow chart of the CSMA/CA algorithm and the techniques of higher layers provided by

6、ZigBee. On the basis of a thorough understanding of IEEE 802.15.4 protocol, the realization of IEEE 802.15.4 simulation system on the platform of the network simulation software OPNET is given. After the descriptions of

7、the system structure and interfaces between modules, the process model, state machine and timer designs are given for the modules of each layer. Moreover, the message interactions of the main the procedures are shown whi

8、ch used in performance evaluation. The simulation scenario for home automation application is designed based on the simulation system. This paper evaluates the main performance parameters of a beacon-enabled IEEE 802.15.

9、4 network in star topology, such as network throughput, average delay and network setup time, and analyzes the impacts of several factors towards those performance parameters, such as network load, packet length, number

10、of nodes, duty cycle and startup time interval. The study shows that the saturation throughput of the network under beacon-enabled mode is about 65%, when the packet length is 100 bytes and the number of nodes is 10. The

11、 performance of IEEE 802.15.4 protocol is good, compared to the saturation throughput of IEEE 802.11a. The values of beacon order (BO) and superframe order (SO) have little influence on the network throughput and average