The Controlled Reception Pattern Antenna (CRPA) is an effective approach for rejecting radio frequency interference. Conventionally, the dedicated CRPA antenna and hardware are usually precisely manufactured and calibrated carefully. The computational/processing requirement is always a major challenge for implementing a CRPA receiver. Even more demanding would be to incorporate the flexibility ...

With the emergence of aperture and focal plane array systems for application in radio astronomy, there is a need for clear definitions of their gain and noise temperature, preferably in terms of a single antenna/receiver system, to enable proper understanding and comparison of system performance. Although in the literature the noise temperature of a phased array receiver was defined in these te...

The fast growth of the wireless communication industry poses severe limitations on radio astronomical observations. This is largely due to the fact that in radio astronomy, in contrast to communication systems, the signals of interest are many orders of magnitude below the receiver noise power levels. The structure of some communication signals opens the possibility to reduce the effect on radi...

This paper will give a detailed discussion about the authors view on Software Defined and Cognitive Radio. After an introduction on different aspects of software radio and a novel approach on cognitive radio is presented. As proof of concept a software defined cognitive radio demonstrator termed Falcon was built up which is described afterwards. The Falcon is entirely based on a modular signal ...

In this paper, we propose an optimized dedicated broadband sensing receiver architecture for use in cognitive radios supporting delay sensitive applications. Specifically, we first reason the need for a dedicated sensing receiver that employs a combination of coarse and fine scanning to reduce sensing time over a large bandwidth. We derive an expression for mean acquisition/detection time as a ...

For lack of empty radio bands, ultrawideband (UWB) radio system allowing reuse of already occupied frequency bands is the only solution to accommodate new wireless data communication services. Two types of UWB carriers are considered here, the frequency-shifted Gaussian pulse and chaotic signal with FM-DCSK modulation. A generalized model of transmitted reference systems is introduced first tha...

In this paper, we have derived the structure of the minimum mean-squared error (MMSE) receiver for non-linearly distorted orthogonal frequency division multiplexer (OFDM) signals in additive white Gaussian noise (AWGN). We demonstrate that this receiver consists of a set of correlators or a set of filters matched to every possible frequency components in the non-linearly distorted OFDM signal f...

An ULP back-channel receiver is presented that demodulates binary a FSK back-channel signal embedded in 5.8GHz IEEE 802.11a Wi-Fi OFDM packets. The architecture of the back-channel receiver employs a two-step downconversion where the first mixing stage downconverts using the 3rd harmonic of the LO for power efficiency. The LP-65nm CMOS receiver consumes 335μW with a sensitivity of -72dBm at a B...

This report focuses on Ultra-Wideband Impulse Radio technology and more specifically focuses on the receiver architecture for these systems. Traditionally digital receiver architectures require analog-to-digital converters (ADC) running at very high sampling frequencies and therefore are not the most efficient and power friendly architectures. Few alternative receiver architectures addressing t...

A particular property of the matched desired impulse response receiver is introduced in this paper, namely, the fact that full exploitation of the diversity is obtained with multiple beamformers when the channel is spatially and timely dispersive. This particularity makes the receiver specially suitable for mobile and underwater communications. The new structure provides better performance than...