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A key technology in cognitive radio (CR) is spectrum sensing that senses the spectrum and reports the available vacant channels. However, due to some effects such as fading or shadowing, an individual sensor may not be able to reliably detect the existence of a primary user (PU). Cooperative spectrum sensing that is proposed to solve such problem, uses a distributed detection system to overcome the...
We consider a source-destination pair assisted by multiple decode-and-forward relays without channel state information at transmitter (CSIT). We investigate three schemes exploiting spatial diversity including multiple-relay cooperation (MR-Coop), conventional multiple-relay relaying (MR-Relay), and multiple-input-single-output (MISO). The total power is equally allocated to transmission partners...
In this paper, we address the performance of a dual- hop relay fading channel in an interference-limited environment, in which the destination node is corrupted by co-channel interference while the relay node is perturbed by only an additive white Gaussian noise. We first investigate the scenario with equal-power interferers, under which the analytical expressions for the outage probability of both...
This paper studies the information-theoretic limits of a cognitive radio (CR) network under spectrum sharing with an existing primary radio (PR) network for wireless communications. In particular, the fading cognitive multiple-access channel (C-MAC) is studied, where multiple CR users transmit to the base station (BS) of the CR network under both individual transmit power constraints and a set of...
This paper investigates the coding gain achieved between the best relay and the relay subset selection in a two-hop wireless network with relay-assisted transmission. Both best relay and relay subset selection achieves the maximum diversity, but the later becomes a better alternative in certain scenarios. First in low mobility scenarios, when the channel fading remains static for longer duration and...
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