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Dynamic spectrum leasing is a new spectrum sharing paradigm to achieve efficient use of the frequency resources for cognitive radio. In this paper, we propose two schemes of selecting secondary nodes as relays. Secondary users act as relays to improve quality of service of primary user, then primary user may lease a fraction of spectrum bands to secondary users. It is shown that these two schemes...
In this work, we present an optimal power allocation scheme dedicated for variable-hop cooperative relays in cognitive networks, which consists of Secondary users (SUs) operating in Amplify-and-Forward (AF) mode, with a Primary user (PU) receiver nearby. In order to assure the quality of service (QoS) for PU, transmit power of cognitive radio (CR) nodes must be tightly controlled which leads to narrow...
Cognitive Radio (CR) is proposed as a promising means to utilize the spectrum more efficiently. However, in cognitive radio system, how to achieve the users' QoS requirements is a challenge. To solve this problem, cooperative relay transmission has been proposed as a powerful approach. In the relay-assisted CR system, users can not only obtain required service directly from the Cognitive Base Station...
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