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The secondary transmitter acts as a relay for the primary link.
Secondary users can exploit the channels when the interference caused by them would not exceed a certain level to pose a great threat for the primary link transmission.
A conventional WPA is assumed for the primary link while the primary performance with a uniform power allocation is used as a reference curve.
On the other hand, for high SNRs, the release of some eigenmodes (due to the constraint ) yields a performance degradation for the primary link.
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However, at its base, it is formed by a simple product between the level of the primary link and the time for the link within the group.
Social media networks have become the primary link for connecting the millennial generation to non-profits and other charity organizations.
That is indicated in square and rounded brackets for the selected secondary links and the primary link, respectively.
Similarly, to model the uncertainty of G k, p i, for the channel gain between the primary links and secondary users, we consider that G k, p i is generated as follows G k, p i = κ k, p − 10 α p log ( d k, p ) + ε k, p i (dB), where α p is set to be 3.1.
In this scheme, the cognitive relay opportunistically switches among three different working modes, that is, Relay for Primary Link (RPL), Relay for Secondary Link (RSL), or Relay for Neither of the Links (RNL), respectively, based on the channel-dependent observation of both systems.
Yellow dotted line stands for cognitive links; black solid line strands for primary link.
In this paper, we assume that the global CSI of the main links, the eavesdropper's links, and primary link is available for evaluating the secrecy rate in the information receiver, which is a common assumption in the literature on physical layer security.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com