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Antenna and base-station diversity have been applied to a wireless sensor network for the monitoring of livestock. A field trial has been described and the advantage to be gained in a practical environment has been assessed.

In this contribution the feasibility and performance of low-cost bidirectional single fibre links for analogue RF fibre-optic (FO) antenna feeding are investigated. Wavelength division multiplexing (WDM) allows transmission of uplink (λopt=1310nm) and downlink (λopt=1550nm) signals over one single standard fibre. Designs using low cost multiple quantum well Fabry-Pérot laser diodes (MQW FP LDs)...

We successfully implemented a smart antenna array processor for a GSM1800 base station. The entire array processing run{time is only 1ms, allowing real{time adaptation of the antenna pattern every GSM frame. The array processing is based on the estimation of the DOAs in the uplink. Separate DOA trackers for uplink and downlink, angular selection diversity, and beamforming with broad nulls guara...

Dual polarized antennas are traditionally characterized in terms of port-to-port isolation and coand cross-polar radiation patterns. In this paper we instead identify the critical parameter when the antenna is used as a sensor in a polarization diversity reception system. This turns out to be the fareld coupling between the two channels. We calculate the antenna output power correlation and div...

This work presents the design of a magneto-electric dipole (MED) antenna for the base station antenna of FM radio broadcasting implementation. The advantages of MED antenna are high gain, stable and symmetrical radiation patterns in both electric and magnetic planes, and low back lobe radiation pattern. The antenna was designed and studied to achieve the optimal dimensions of configuration para...

This paper presents the measured propagation characteristics like a path loss, delay spread and angular spread for urban environments in Jeju at 781 MHz. Measurements were made with a wide band MIMO channel sounder using a pseudo noise (PN) mode, 50 Mcps, 20 ns resolution and 40.96 μs maximum delay. Base station (BS) antenna height of 5 m was tested with a mobile station (MS) antenna height of ...

Two design parameters, SNR and correlation, are key factors for enhancing channel capacity in MIMO systems. Achieving high SNR and low correlation is desirable in antenna design. This paper discusses the relation between channel capacity and these two parameters, and presents simple formulas of this relation for propagation channels and antenna coupling of mobile terminals. According to these g...