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تعداد صفحات این فایل: ۱۲ صفحه

بخشی از مقاله انگلیسیعنوان انگلیسی:Performance Evaluation of Wireless Sensor Networks Based On Zigbee Technology in Smart Home~~en~~

Abstract

Wireless Sensor Networks (WSNs) has diverse application domains such as smart home, smart care, industrial, etc. In this paper, we present a WSN system based on the ZigBee technology (IEEE 802.15.4) in Smart Home. To have a good sensor networks communication implanted in a smart home, studies of operating performance on this network is important. In this work, we investigate the performance of our ZigBee sensor networks. The study of performance is based on measurements of the Received Signal Strength Indicator (RSSI) in different parts of the Home. We will also discuss the impact of electromagnetic noise on the communication performance of a ZigBee Sensor Network in the presence of a motor with variable speed drive.

۱ Introduction

The integration of smart devices and an intelligent network in a home can make it smart and also allows customers to manage energy in a way that is appropriate, cost effective and good for the environment. In the field of Smart Home, many applications benefit from the advantages inherent in the use of Wireless Sensor Networks including remote monitoring, continuous data recovery energy consumption, location, recall and management of temperature and humidity, motion detection, understanding and observation of the people’s environment [1,2]. To better control energy consumption in the Smart Home, the Home Area Network (HAN) is used to collect sensor information from a variety of devices inside the home, and optionally sends control information to these devices. ZigBee is a high technology for the Smart Home network communication. It is designed to be able to get rid of electrical cabling inside home. ZigBee, as a wireless mesh networking scheme low in cost, power, data rate, and complexity, is ideal for Smart Home applications [3,4]. The structure of Wireless Sensor Networks in the smart home requires three different devices: Coordinator, Router and End Device (Figure 1). All home environments can then be monitored and the required data can be delivered to the coordinator. After the treatment of the data, the appropriate control commands are sent through coordinator to home appliances.

II. ZIGBEE TECHNOLOGY IN WIRELESS SENSOR NETWORKS

The ZigBee communication protocol is popularly adopted in wireless sensor networks (WSNs) [2,5], because it has lowpower and low-cost characteristics [3], and therefore it is very suitable for the development and use of Smart Home. The physical layer of ZigBee protocol supports three frequency bands; a 2450 MHz band (with 16 channels), a 915 MHz band (with 10 channels) and a 868 MHz band (1 channel). The access mode for all these frequency bands is Direct Sequence Spread Spectrum (DSSS). The 2450 MHz band employs Offset Quadrature Phase Shift Keying (O-QPSK) for modulation while the 868/915 MHz bands use Binary Phase Shift Keying (BPSK). Table I summarizes the frequency bands and data rates of the ZigBee technology IEEE 802.15.4 [8].

III. WSN BASED ON ZIGBEE TECHNOLOGY PERFORMANCE IN SMART HOME

A. Experimental setup

Figure 2 shows the experimental setup. In this experiment, our WSN test system based on the ZigBee technology in Smart Home consists of a client computer that provides a user interface for the system, a coordinator as data collector and multiple devices that provide sensor readings on ZigBee communication links. The experimental system is divided into three main parts: • A user interface communicates with the user via the computer and displays the results. • A coordinator collects sensor readings to the user. • An end device consists of two parts: sensor interface and ZigBee interface. The sensor used in this test is a temperature sensor.

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