A Review on Sensor Network Issues and Robotics <s> Wi-Fi Based Indoor <s> The advances in localization based technologies and the increasing importance of ubiquitous computing and context-dependent information have led to a growing business interest in location-based applications and services. Today, most application requirements are locating or real-time tracking of physical belongings inside buildings accurately; thus, the demand for indoor localization services has become a key prerequisite in some markets. Moreover, indoor localization technologies address the inadequacy of global positioning system inside a closed environment, like buildings. Based on this, though, this paper aims to provide the reader with a review of the recent advances in wireless indoor localization techniques and system to deliver a better understanding of state-of-the-art technologies and motivate new research efforts in this promising field. For this purpose, existing wireless localization position system and location estimation schemes are reviewed, as we also compare the related techniques and systems along with a conclusion and future trends. <s> BIB001 </s> A Review on Sensor Network Issues and Robotics <s> Wi-Fi Based Indoor <s> Localization plays an essential role in many ubiquitous computing applications. While the outdoor location-aware services based on GPS are becoming increasingly popular, their proliferation to indoor environments is limited due to the lack of widely available indoor localization systems. The de-facto standard for indoor positioning is based on Wi-Fi and while other localization alternatives exist, they either require expensive hardware or provide a low accuracy. This paper presents an investigation into localization system that leverages signals of broadcasting FM radio stations. The FM stations provide a worldwide coverage, while FM tuners are readily available in many mobile devices. The experimental results show that FM radio can be used for indoor localization, while providing longer battery life than Wi-Fi, making FM an alternative to consider for positioning. <s> BIB002
Localization. Wi-Fi, or wireless networking, is one of the biggest changes to the way we use computers since the PC was introduced. Wi-Fi also allows communications directly from one computer to another BIB001 . The widespread availability of wireless networks (Wi-Fi) has created an increased interest in harnessing them for other purposes, such as localizing mobile devices. There has long been interest in the ability to determine the physical location of a device given only Wi-Fi signal strength. This problem is called Wi-Fi localization and has important applications in activity recognition, robotics, and surveillance. The key challenge of localization is overcoming the unpredictability of Wi-Fi signal propagation through indoor environments. The data distribution may vary based on changes in temperature and humidity, as well as position of moving obstacles, such as people walking throughout the building. The uncertainty makes it difficult to generate accurate estimates of signal strength measurements. Wi-Fi based systems have number of issues, including high power consumption, being limited to coverage, and being prone to interference BIB002 .