Summary
International Symposium on Antennas and Propagation
2010
Session Number:3TF3
Session:
Number:3TF3-1
MIMO Sensor ~ Experimental Channel Characterization in Indoor Environment~
Naoki Honma, Takashi Sugiura, Kentaro Nishimori, Hiroaki Sato, Yoshitaka Tsunekawa,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
Several kinds of the sensor systems for home safety and security systems have been developed, and most of them employ the optical devices, such as infrared sensor and video camera. However, these optical sensors cannot detect the target behind the obstacles since they depend on the visibility. The microwave sensor can be a strong candidate for the robust detection system for such application. The microwave sensor using existing signals, such as wireless LAN, TV broadcast signals and so on, have been studied, and they have proved that the microwave sensor can be effective in break-in detection [1]-[2]. MIMO (Multiple-Input Multiple-Output) communication systems are widely used recently since they can greatly enhance the data rate without expanding the frequency band width [3]. MIMO system uses several antennas and the spatial multiplexing is one of the key features for enhancing communication quality. However, the time-variant channel greatly affects its performance if the spatial resources are fully exploited [4]. This means, an event detection scheme using MIMO channel variation has a great potential to achieve high performance sensor systems. In this paper, a MIMO sensor using microwave band is proposed and evaluated based on the MIMO channel measurement in indoor environment. This MIMO sensor uses all components of the MIMO channel matrix, and detects the events based on the channel variation [5]. In 2, the key idea of MIMO sensor is described and the measurement setup for verifying MIMO channel is indicated. In 3, the channel characteristics are experimentally verified and the phenomena of the channel variation are considered. In 4, the MIMO sensor performance based on fundamental scheme is clarified.