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Mixers are one of the fundamental components of many receivers and transmitters, especially in the microwave range. Any mixer-based receiving or transmitting system requires that each mixer has well-known amplitude, group delay and phase responses. A linear phase and constant group delay in particular are essential for low bit error rates (BER) during data transmission in wireless and satellite communications...
Finding the location of a mobile agent has been long an issue of interest for many applications. Many techniques have been introduced for local position estimation which are usually based on array concept and typically apply either of frequency or phase variation methods. Arrays are usually used in the receiver side and the problem is to find the position of the transmitter. In this study, a new Line-of-Sight...
Models of the spatial distribution of the scatterers that surrounds a transmission path, i.e., spatial channel models, play a crucial role in predicting the performance of multiple-input multiple-output wireless communication systems. Most conventional approaches to characterizing spatial channels based on measured channel response data require either mechanically steerable directional antennas or...
This paper reports on the world's first CMOS low noise amplifier (LNA) operating successfully on a radio telescope since October 15th, 2010. The radio telescope used in this work is the Synthesis Telescope operated by the Dominion Radio Astrophysical Observatory, NRC, and located near Penticton, BC, Canada. This paper describes the work that led to the installation of the LNA on the telescope and...
This paper discusses the optimization procedure and the selection of the resolution of the analog/digital converter (ADC) for the Square Kilometre Array (SKA) receiver chain. Once the optimum input voltage levels of ADCs with different resolutions are selected, the maximum interference levels and correlator integration time are investigated for a two-antenna system. The selection methodology, based...
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