25 research outputs found
Survey of FPGA applications in the period 2000 – 2015 (Technical Report)
Romoth J, Porrmann M, Rückert U. Survey of FPGA applications in the period 2000 – 2015 (Technical Report).; 2017.Since their introduction, FPGAs can be seen in more and more different fields of applications. The key advantage is the combination of software-like flexibility with the performance otherwise common to hardware. Nevertheless, every application field introduces special requirements to the used computational architecture. This paper provides an overview of the different topics FPGAs have been used for in the last 15 years of research and why they have been chosen over other processing units like e.g. CPUs
SCEE 2008 book of abstracts : the 7th International Conference on Scientific Computing in Electrical Engineering (SCEE 2008), September 28 – October 3, 2008, Helsinki University of Technology, Espoo, Finland
This report contains abstracts of presentations given at the SCEE 2008 conference.reviewe
Non-Radiative Calibration of Active Antenna Arrays
Antenna arrays offer significant benefits for modern wireless communication systems
but they remain difficult and expensive to produce. One of the impediments of utilising
them is to maintain knowledge of the precise amplitude and phase relationships between
the elements of the array, which are sensitive to errors particularly when each element
of the array is connected to its own transceiver. These errors arise from multiple
sources such as manufacturing errors, mutual coupling between the elements, thermal
effects, component aging and element location errors. The calibration problem of
antenna arrays is primarily the identification of the amplitude and phase mismatch, and
then using this information for correction.
This thesis will present a novel measurement-based calibration approach, which uses a
fixed structure allowing each element of the array to be measured. The measurement
structure is based around multiple sensors, which are interleaved with the elements of
the array to provide a scalable structure that provides multiple measurement paths to
almost all of the elements of the array. This structure is utilised by comparison based
calibration algorithms, so that each element of the array can be calibrated while
mitigating the impact of the additional measurement hardware on the calibration
accuracy. The calibration was proven in the investigation of the experimental test-bed,
which represented a typical telecommunications basestation. Calibration accuracies of
±0.5dB and 5o were achieved for all but one amplitude outlier of 0.55dB. The
performance is only limited by the quality of the coupler design. This calibration
approach has also been demonstrated for wideband signal calibration
First Annual Workshop on Space Operations Automation and Robotics (SOAR 87)
Several topics relative to automation and robotics technology are discussed. Automation of checkout, ground support, and logistics; automated software development; man-machine interfaces; neural networks; systems engineering and distributed/parallel processing architectures; and artificial intelligence/expert systems are among the topics covered