Indoor coverage for wearable devices with user deployed access points
1999 (English)Conference paper (Refereed)
Future wireless systems are expected to provide considerably higher data rates (100 Mbit/s) than current systems. This in turn implies short-range communication with a large number of wireless access points. In order to keep the infrastructure cost down, it is imperative that the deployment of this infrastructure is fast and cheap. One possibility is to let the users themselves deploy the infrastructure in unlicensed bands in an ad-hoc fashion such as in current Wireless LANs. In this paper we estimate the maximum coverage area as a function of the intended data rate in a system with user deployed access points. We consider indoor systems in the 17, 24 and 60 GHz bands, which have been proposed for very high-bandwidth personal communication. No interference from other users is considered at this stage. Difficult propagation conditions at these frequencies and restricted transmitter power limit the coverage of wire-less access points. Human body shadowing is considered, since wearable devices, usually carried close to the body, have a restricted visibility. Results show that human body shadowing together with disadvantageous placed access points drastically reduces achievable data rates. Up to 100 Mbit/s can be achieved at 17 GHz only in small rooms. Space diversity, i.e. installation of two access points per room, can compensate for severe body shadowing and data rates up to 100 Mbit/s may be feasible in larger rooms and at 60 GHz. The results indicate that, from a coverage perspective, user deployed system indeed provide a possibility for future wireless infrastructures.
Place, publisher, year, edition, pages
1999. 55-58 p.
Computer and Information Science
Research subject SRA - ICT
IdentifiersURN: urn:nbn:se:kth:diva-28103OAI: oai:DiVA.org:kth-28103DiVA: diva2:383960
Personal Computing & Communication Workshop
QC 201101112011-01-062011-01-062011-01-11Bibliographically approved