Performance Analysis of NOMA Short-Packet Communications With QoS-Based SIC Detecting Order
Ngoc Phuc Le, Khoa N. Le
Abstract
In this letter, we perform an unified analysis of an uplink non-orthogonal multiple access (NOMA) system with short-packets over a wide range of fading channels, such as lognormal-Nakagami- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${m}$ </tex-math></inline-formula> , generalized <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$K_{G}$ </tex-math></inline-formula> , <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\eta -\mu $ </tex-math></inline-formula> , Nakagami- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${q}$ </tex-math></inline-formula> (Hoyt), <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\kappa -\mu $ </tex-math></inline-formula> , Rician, Nakagami- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${m}$ </tex-math></inline-formula> , and Rayleigh fading. The system model consists of a high-priority user with low-rate, low-latency and high-reliability requirements, and a low-priority user with high-rate and delay-tolerant. We first derive closed-form expressions of the average block error-rate (BLER) and the asymptotic at the high signal-to-noise ratio (SNR) regime. Next, we optimize the power back-off level and the packet-length to maximize the throughput of the low-priority user subject to the quality-of-service (QoS) requirements of the high-priority user. Theoretical analysis is corroborated by simulation results.