With the development of sensor techniques, low-power electronic and radio techniques, low-power and inexpensive wireless sensors have been put into application, then the wireless sensor networks have appeared. Wireless sensor networks can be applied to many Lacoste Polo Shirts areas, such as military affairs, commerce, medical care, environmental monitoring, and have become a new research focus in computer and communication fields. Many applications of wireless sensor chi straightener networks are based on sensor self-positioning, such as battlefield chi flat iron surveillance, environment monitoring, indoor user tracking and others, which depend on knowing the location of sensor nodes. Because of the constraint in size, power, and cost of sensor nodes, the investigation of efficient location algorithms which satisfy the basic accuracy requirement for WSN meet new challenges.The ralph lauren polo shirts location techniques for WSN can be divided into two categories : Range-based approaches and Range-free approaches. Range-based methods have better accuracy, but require additional hardware at the sensor custom made prom dresses nodes, which are not available on regular application sensor networks. Acknowledging the requirement of hardware cost, the range-based solutions may be inappropriate in relation to the required location precision. Researchers have sought alternate range-free solutions to the localization problems in sensor networks. The range-free algorithms make no assumption about the availability or validity of range information.
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