Wireless Channel Modelling for Indoor Populated Environments

The recent development of indoor wireless local area §network (WLAN) standards at 2.45 GHz and 5 GHz has §led to increased interest in propagation studies at §these frequency bands. Within the indoor §environment, human body effects can strongly reduce §the quality of wireless communication systems. Human §body effects can cause temporal variations and §shadowing due to pedestrian movement and antenna-§body interaction with portable terminals. This book §presents a statistical characterisation, based on §measurements, of human body effects on §indoor narrowband channels at 2.45 GHz and at 5.2 §GHz. A novel cumulative distribution function (CDF) §that models the 5 GHz narrowband channel in §populated indoor environments is proposed. This §novel CDF describes the received envelope in terms §of pedestrian traffic. In addition, a novel channel §model for the populated indoor environment is §proposed for the Multiple-Input Multiple-Output §(MIMO) narrowband channel in presence of pedestrians §at 2.45 GHz. Results suggest that practical MIMO §systems must be sufficiently adaptive if they are to §benefit from the capacity enhancement caused by §pedestrian movement.