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In this paper, the analysis model which suites to Cognitive Radio (CR) communication together with amplify-and-forward cooperative communication systems where cognitive users can act as cooperative diversity relays to the licensed users based on average Channel State Information (CSI) is presented. Firstly, the model of the cooperative and cognitive radio system is given. Then, the transmitting protocols...
We consider the problem of maximizing the average spectral efficiency of a secondary link in underlay cognitive networks. In particular, we consider the network setting whereby the secondary transmitter employs discrete rate and variable power adaptation under the constraints of maximum average transmit power and maximum average interference power allowed at the primary receiver due to the existence...
This paper proposes a novel structure of multi-antenna spectrum sensing to solve the problem of the SNR Wall under harsh channel condition like deep fading. Our objective is to exploit the spatial diversity largely with resort to singular value decomposition (SVD) of the auto-correlation of the parallel signal flows. To evaluate its performance, the ROC of the proposed scheme is deduced in close form...
In this paper, we investigate the outage probability of a wireless two relay (diamond relay) network which consists of a source, a destination and two network clusters. Each cluster is defined by a number of cognitive nodes (unlicensed) and a primary node (licensed). The cognitive nodes relay the source information by employing opportunistic spectrum access. We consider amplify-and-forward (AF) relaying...
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