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In this paper the effect of on-air-combining on the signal quality in distributed transmitter systems like active antennas is described. Active antennas containing a multitude of parallel, independent transmitter chains are emerging in the mobile communication base station market. Due to the independent transmitter chains, each signal is subject to different distortions by the various transmitter...
In this paper a statistical analysis of the impact of phase- and amplitude-distortions on the performance of active antenna arrays for mobile communication base stations is presented. The cause and influence of different contributors to these distortions is described and the allowable phase- and amplitude-margins that need to be reached for mobile communication base station applications are derived...
A novel method for the design and fabrication of low-cost filtering devices for cellular applications is presented in this paper. The proposed filter technology is based on the integration of 3-D coaxial resonators with 2-D printed-circuit boards (PCBs). Specifically, metallized plastic resonators are properly mounted on planar PCBs, while printed transmission lines (i.e. striplines) are employed...
Femtocells are low-cost, low-power cellular base stations that are deployed by the end user to supplement macro-cellular coverage and provide high data rates in the customer's premises. In femtocell deployments, leakage of the pilot signal to the outside of a house can result in a highly increased signalling load to the core network as a result of the higher number of mobility events caused by passing...
Rising energy costs and the recent international focus on climate change issues has resulted in a high interest in improving the energy efficiency in the telecommunications industry. In this paper the effects of a joint deployment of macrocells for area coverage and publicly accessible residential picocells on the total energy consumption of the network is investigated. The decreasing energy efficiency...
The paper describes two different approaches for the detection of wound healing. The state of curing of the wound shall be determined without taking off bandages or stickers. Furthermore the curing state in burried layers of tissue shall be supervised. All curing states have to be detected without direct contact to the injured person in order to avoid pain. One approach is to use a coaxial sensor...
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