Indoor radio channel modeling and mitigation of fading effects using linear and circular polarized antennas in combination for smart home system at 868 MHz

[摘要] The markets for smart home products and services are expected to grow overthe next years, driven by the increasing demands of homeowners consideringenergy monitoring, management, environmental controls and security.

Many of these new systems will be installed in existing homes and officesand therefore using radio based systems for cost reduction. A drawback ofradio based systems in indoor environments are fading effects which lead toa high variance of the received signal strength and thereby to a difficultpredictability of the encountered path loss of the various communicationlinks.

For that reason it is necessary to derive a statistical path loss modelwhich can be used to plan a reliable and cost effective radio network. Thispaper presents the results of a measurement campaign, which was performed insix buildings to deduce realistic radio channel models for a high variety ofindoor radio propagation scenarios in the short range devices (SRD) band at868 MHz.

Furthermore, a potential concept to reduce the variance of the receivedsignal strength using a circular polarized (CP) patch antenna in combinationwith a linear polarized antenna in an one-to-one communication link ispresented.

[学科分类] 电子、光学、磁材料