zigbeeieee802154网络应用实例毕业论文外文翻译(编辑修改稿)

zigbeeieee802154网络应用实例毕业论文外文翻译(编辑修改稿)内容摘要：

nly oneway munication from the remote to the entertainment device. Also, IR signals do not perate walls and other objects and therefore require line of sight to operate properly. Radio frequency (RF) signals, however, easily perate walls and most objects. IEEE is a proper replacement for IR technology in remote controls because of the low cost and long battery life of ZigBeebased wireless munication. IEEE can be used to create twoway munications between the remote control and the entertainment device. For example, song information or onscreen programming options can be downloaded in to the remote itself, even when the remote control is not in the same room as the entertainment device. Industrial Automation At the industrial level, ZigBee mesh working can help in areas such as energy management, light control, process control, and asset management. In this section, application of ZigBee in asset management and personnel tracking is briefly reviewed. Asset Management and Personnel Tracking Passive radio frequency identification (RFID) tags have been in use for several years. Although a passive RFID tag does not have any battery, the RFID reader unit can be a batterypowered instrument. A passive RFID tag can transmit only simple information such as an ID number, which is sufficient for many asset management applications. Active RFIDs, such as ZigBee devices, are battery powered and generally are more expensive than passive RFIDs. ZigBeebased active RFIDs have longer range than passive RFIDs and can provide additional services such as estimating the location of assets or personnel. Chapter 7 covers the details of ZigBeebased location methods. The basic concept of location estimation is shown in Figure , where location of personnel is tracked inside a typical office building with offices and cubes. There are three fixed ZigBee nodes with known locations. The mobile ZigBee node, carried by an employee, broadcasts a signal that is received by all three fixed nodes. The signal bees weaker as it travels longer。 therefore, the amplitude of the signal received by each of the fixed nodes can be different. There are several algorithms that can take the received signal strength at the three fixed nodes and calculate the approximate location of the mobile node. The signal transmitted from the mobile node is reflected from walls and other objects in the room before it reaches the fixed nodes, which results in reduced accuracy of the location estimation. Chapter 7 reviews some of the methods developed to improve the location estimation accuracy. Livestock Tracking Livestock are vulnerable to disease, and it is important to track and identify a diseased animal quickly. Rapid disease response reduces the number of producers impacted by a disease outbreak or other animal health events [6] . Passive RFID tags have been used as an inexpensive solution for livestock tracking and can be sufficient for some applications. Passive RFID tags have limited range and can only provide previously stored information such as an identification number. IEEE active tags can cost more than passive ones, but the IEEE tags have extended range and can provide additional information such as animal heartbeat and the animal’s approximate location. Healthcare One of the applications of IEEE in the healthcare industry is。