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In this paper, a link adaptation and untrusted relay assignment (LAURA)framework for efficient and reliable wireless cooperative communications withphysical layer security is proposed. Using sharp channel codes in differenttransmission modes, reliability for the destination and security in thepresence of untrusted relays (low probability of interception) are providedthrough rate and power allocation. Within this framework, several schemes aredesigned for highly spectrally efficient link adaptation and relay selection,which involve different levels of complexity and channel state informationrequirement. Analytical and simulation performance evaluation of the proposedLAURA schemes are provided, which demonstrates the effectiveness of thepresented designs. The results indicate that power adaptation at the sourceplays a critical role in spectral efficiency performance. Also, it is shownthat relay selection based on the signal to noise ratio of the source to relayschannels provides an interesting balance of performance and complexity withinthe proposed LAURA framework.

Link Adaptation with Untrusted Relay Assignment: Design and Performance Analysis