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Signal classification plays an important role in spectrum sensing for cognitive radios to identify and avoid interference from other wireless devices. In this paper, we study a network of cognitive radios that jointly perform signal classification via cooperation. We propose a simple but effective linear cooperation scheme to fuse pre-processed measurements collected from spatially distributed cognitive...
Time-reversal processing (TRP) has been intensively studied for underwater object detection, however, most of the current research focuses on demonstration of the concept and development of the methods. This paper concerns the application of TRP to improving detection performance of multidimensional signals from the statistical signal processing perspective. Two commonly used time-reversal (TR) methods,...
In this paper, we consider a relay system with a number of potential relay nodes. We propose several relay assignment protocols to select a relay node to help transmit source data so that the average outage probability of the system is reduced. These protocols include: Optimal-Position relay assignment, Nearest-Optimal-Position relay assignment, and Left (Right)-Nearest-Optimal-Position relay assignment,...
Two-way amplify-and-forward relaying is considered in this paper. We propose adaptive power allocation (PA) algorithms to maximize the instantaneous achievable rate and minimize the system outage probability, respectively. Both single- and multi-relay systems are considered. It is shown that the proposed adaptive PA algorithms significantly outperform the uniform PA algorithms. Furthermore, exploiting...
In this paper we analyze the diversity performance of a general cooperative transmission system equipped with nonregenerative fixed gain relays in flat fading channels. Through outage probability and diversity analysis, we derive the diversity order of a two-hop cooperative transmission system when the relay has an arbitrary fixed gain. It is found that the end-to-end diversity order in such two-hop...
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