cellular networks

With the development of CDMA cellular networks, the cellular mobile communication system develops swift. The wireless positioning technology is broadly used, services in the network based on mobile position, such as public safety, emergency alarm, bill based on mobile sell discount wedding dresses position, car and traffic management, navigation and wireless resources management etc. all of these have something to do with wireless positioning. The location of mobile position is mainly carried out in the Wireless Sensor Network (WSN).The positioning of node is a research focus in wireless discount wedding dresses sensor network, and it is the foundation of the service based on the node plus size wedding dresses position. Therefore, the study of the node positioning in WSN have blog lace wedding dresses important significance.In this paper, we summarize the wireless sensor network firstly, introduce it's structure and characteristic. Then we do some research on the node positioning in WSN. The method of positioning node is mainly divided into two sorts, one is based on the measured distance (range based), the other one do not need to measure the blog new shirts 2010 distance (range free), and there are lots of methods in each sort. In the actual system, the transmission of signal is not along line of sight (LOS) all the time, when blocked by mountains and tall buildings, it will transmit accord scattering and refraction, which is called non line of sight (NLOS) transmission.
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