Measurement of keyhole effect in a wireless multiple-input multiple-output (MIMO) channel

Multiple - Input Multiple - Output ( MIMO ) Optical Wireless Communications

A Low-Cost Open-Hardware Wideband Multiple-Input-Multiple-Output (MIMO) Wireless Channel Sounder

Due to the complexity of multiple-input–multipleoutput (MIMO) wireless channels, direct measurement is the main viable option for accurate characterization. Details on a new low-cost wideband channel sounder are presented, which was mainly constructed from conventional instruments and components. This switched architecture system is similar to commercial channel sounders and has modest cost (< ...

Multiple-Input Multiple-Output Wireless Systems

The paper gives an overview of the multiple-input multiple-output (MIMO) systems and discusses their benefits enabling an increase in the system capacity and an increase of system reliability. The former is attained by signal multiplexing and the later by space encoding. The basic algorithms required for a proper operation of the MIMO systems, i.e. channel estimation, equalisation, optimal and ...

A Multiband Multiple-input Multiple-output Antenna System for Long Term Evolution and Wireless Local Area Networks Handsets

A novel multiband multiple-input-multiple-output (MIMO) antenna system is proposed. The MIMO antenna system consists of two antenna elements, each of which comprises of three radiators: a driven monopole, an S-shaped strip and an inverted F-shaped strip and occupies footprint of 15x18.5x0.8 mm3 only. The driven monopole acts as a quarter-wave monopole and stimulate higher mode resonance. The tw...

Measurement of Keyholes and Capacities in Multiple-Input Multiple-Output (MIMO) Channels

It has been predicted theoretically that for some environments, the capacity of wireless MIMO systems can become very low even for uncorrelated signals; this effect has been termed keyhole or pinhole. In this paper the first measurements of this effect are presented. The measurements were performed in a controlled indoor environment that was designed to create a keyhole effect. We analyze limit...