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This paper reports relative performance of decode-and-forward (DF) andamplify-and-forward (AF) relaying in a multi-antenna cooperative cognitiveradio network (CCRN) that supports device-to-device (D2D) communications usingspectrum sharing technique in cellular network. In this work, cellular systemis considered as primary and internet of things devices (IoDs), engaged in D2Dcommunications, are considered to be secondary system. The devices access thelicensed spectrum by means of the cooperation in two-way primarycommunications. Furthermore, IoDs are energized by harvesting the energy fromradio frequency (RF) signals, using simultaneous wireless information and powertransfer (SWIPT) protocol. Closed form expressions of outage probability forboth cellular and D2D communications are derived and the impact of variousdesign parameters for both AF and DF relaying techniques are studied. Based onthe simulation results, it is found that the proposed spectrum sharingprotocol, for both DF relaying and AF relaying schemes, outperform anothersimilar network architecture in terms of spectrum efficiency. It is alsoobserved that the performance of the proposed system using DF relaying isbetter than AF relaying scheme in terms of energy efficiency at same transmitpower.

Outage Analysis in SWIPT Enabled Cooperative AF/DF Relay Assisted Two-Way Spectrum Sharing Communication