A Generalized STAR-RIS-Empowered Ambient Backscatter Short-Packet Communication Systems With Partial NOMA

• Published in: IEEE communications letters 2024-12, Vol.28 (12), p.2744-2748
• Main Authors: Nguyen, Tien-Hoa, Vu, Thai-Hoc
• Format: Article
• Language: English
• Subjects: Backscatter; Backscattering; Communications systems; Energy efficiency; Error analysis; Fading channels; Hybrid active and passive simultaneously transmitting and reflecting reconfigurable intelligent surface; Information theory; Interference cancellation; NOMA; Nonorthogonal multiple access; Packet transmission; partial non-orthogonal multiple access; Probability density function; Reconfigurable intelligent surfaces; short-packet communication; Signal to noise ratio; Thermal noise; Upper bounds
• ISSN: 1089-7798; 1558-2558
• DOI: 10.1109/LCOMM.2024.3475569

This letter proposes a simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS)-empowered ambient backscatter short-packet paradigm with partial non-orthogonal multiple access (p-NOMA). In this paradigm, a multi-antenna base station communicates with users using finite blocklength schemes to achieve low latency transmission while flexibly exploiting the spectrum utilization via p-NOMA. Considering Nakagami-m fading channels, discrete phase-shift alignment, and imperfect successive interference cancellation, we provide a generalized information-theoretic framework that characterizes passive, active, and hybrid STAR-RIS types, to measure the block-error rate (BLER) and goodput. To gain useful insights into system designs, an upper-bound BLER at high transmit power has been derived. Numerical results demonstrate the BLER superiority of p-NOMA over its orthogonal multiple access (OMA) and NOMA counterparts, as well as the respective twofold and fourfold enhancements in terms of goodput.