Network-Coded Cooperative Systems With Generalized User-Relay Selection

• Published in: IEEE transactions on wireless communications Vol. 19; no. 11; pp. 7251 - 7264
• Main Authors: Heidarpour, Ali Reza, Ardakani, Masoud, Tellambura, Chintha, Di Renzo, Marco, Uysal, Murat
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.11.2020; The Institute of Electrical and Electronics Engineers, Inc. (IEEE); Institute of Electrical and Electronics Engineers
• Subjects: 5G mobile communication; Channel models; Codes; Coding; diversity order; Diversity reception; Engineering Sciences; Fading channels; Generalized user-relay selection (GURS); Monte Carlo simulation; network-coded cooperative; outage analysis; Relay; Relays; Signal and Image processing; Signal to noise ratio; Wireless communication; diversity order; outage analysis; networkcoded cooperative; network-coded cooperative; Generalized user-relay selection (GURS)
• ISSN: 1536-1276; 1558-2248; 1558-2248
• DOI: 10.1109/TWC.2020.3010243

We consider a network-coded cooperative (NCC) system that consists of <inline-formula> <tex-math notation="LaTeX">N \ge 2 </tex-math></inline-formula> sources, <inline-formula> <tex-math notation="LaTeX">M\ge 1 </tex-math></inline-formula> decode-and-forward (DF) relays, and a single destination. The relays perform network coding (NC) on the received sources' symbols using maximum distance separable (MDS) codes. For this system, we propose the most generalized user-relay selection (GURS) scheme in the literature that selects any arbitrary subsets of <inline-formula> <tex-math notation="LaTeX">K </tex-math></inline-formula> users and any arbitrary subsets of <inline-formula> <tex-math notation="LaTeX">L </tex-math></inline-formula> relays subject to practical constraints such as load balancing conditions and scheduling policy. Our analytical results and design guidelines generalize and subsume all existing results as special cases. To this end, we derive a new closed-form outage probability (OP) expression, assuming non-identically and independently distributed (n.i.i.d.) Rayleigh fading channels. The asymptotic outage expression at high signal-to-noise ratio (SNR) regime is further derived, based on which, the achievable diversity order and coding gain are quantified. The theoretical derivations are also validated through Monte-Carlo simulation.