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Robust Positioning Algorithms for Wireless Networks. Statistical Approaches to Non-Line-of-Sight (NLOS) Mitigation

Автор:   Ulrich H.
мягкая обложка
156 страниц
2010 год
Издательство:   Книга по Требованию
Цена:
3212 руб
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Описание:This phenomenon, called non-line-of-sight (NLOS) propagation, yields erroneous signal parameters and consequently high positioning errors. This work deals with the problem of determining the geographic position of a radio transmitter by exploiting signal parameters such as time-of-arrival (TOA), angle-of-arrival (AOA) or others together with the geometry of a network of receivers. However, in practice obstacles such as buildings and trees reflect the signals and hinder them to arrive at the receivers via the direct path. This book presents several approaches to design statistical algorithms that achieve similar positioning accuracy to conventional techniques in LOS environments and do not degrade significantly when the degree of NLOS propagation increases. If direct physical connections between the transmitter and each of the receivers exist, meaning the channel is in line-of-sight (LOS), accurate position estimates can be obtained by trilateration or triangulation techniques.


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Fedora Linux

wireless networks from the command line For wireless interfaces, there are two additional commands that are useful for configuration: iwconfig , which sets wireless parameterssuch as the channel, encryption, and ESSIDand iwlist , which can be used to scan for available networks. iwconfig will display current settings if no parameters are given: # iwconfig lo no wireless extensions. eth0 no wireless extensions. sit0 no wireless extensions. wlan0 IEEE 802.11b ESSID:"" Nickname:"zd1201" В В В В В В В В  Mode:Managed Channel:6 Access Point: 00:90:4C:7E:00:29 В В В В В В В В  Bit Rate:11 Mb/s В В В В В В В В  Retry:off RTS thr:off Fragment thr:off В В В В В В В В  Encryption key:off В В В В В В В В  Power Management:off В В В В В В В В  Link Quality:0/128 Signal level=60/128 Noise level:0/128 В В В В В В В В  Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 В В В В В В В В  Tx excessive retries:0 Invalid misc:0 Missed beacon:0 Here you can see that this interface has associated with an access point with a MAC ...»

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