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Outage analysis of nonorthogonal in‐band relay‐aided device‐to‐device communications in Rayleigh fading channels
Author(s) -
Shirvani Moghaddam Shahriar
Publication year - 2017
Publication title -
internet technology letters
Language(s) - English
Resource type - Journals
ISSN - 2476-1508
DOI - 10.1002/itl2.8
Subject(s) - relay , rayleigh fading , fading , computer science , topology (electrical circuits) , throughput , noise (video) , outage probability , signal to noise ratio (imaging) , electronic engineering , relay channel , telecommunications , power (physics) , wireless , channel (broadcasting) , physics , electrical engineering , engineering , image (mathematics) , quantum mechanics , artificial intelligence
Minimizing the outage probability and/or maximizing the throughput, optimally realize relay‐aided nonorthogonal in‐band (NO‐IB) device‐to‐device (D2D) communications. In this letter, we derive closed‐form expressions for the outage probability of NO‐IB amplify‐and‐forward (AF) and decode‐and‐forward (DF) relay‐aided D2D communications in Rayleigh fading channels. Numerical analyses show that the closed‐form formulas are in close agreement with the simulation results. Furthermore, we investigate the effect of signal‐to‐noise ratio and the distances between D2D pairs and relay nodes as well as cellular users. First results show that in the low‐noise regime, AF outperforms DF while they perform very close in the moderate noise level and DF outperforms AF in the high‐noise power. Second, we indicate that the relay‐aided AF/DF D2D communications is more reliable than the direct one when the TX/RX nodes of a D2D pair is distant approximately more than half of the cell radius.