User pairing algorithm with SIC in non-orthogonal multiple access system

• Main Authors: Zhang, Han, Zhang, De-Kun, Meng, Wei-Xiao, Li, Cheng
• Format: Conference Proceeding
• Language: English
• Subjects: Algorithms; Channels; Complexity theory; Computer simulation; Conferences; Interference; Multiple access; new user access; NOMA; Non-orthogonal multiple access; Receivers; Resource management; Signal to noise ratio; Silicon carbide; Spectra; successive interference cancellation; user pairing
• ISSN: 1938-1883
• DOI: 10.1109/ICC.2016.7511620

As one of the candidate wireless access techniques of 5G system, non-orthogonal multiple access (NOMA) is a power domain non-orthogonal multiple-access technique, which can greatly enhance spectral efficiency and system capacity. This paper mainly focus on user pairing and access theme of NOMA system, and respectively presents channel state sorting pairing algorithm (CSS-PA) as user pairing (UP) theme and user difference selecting access (UDSA) algorithm as new user access theme. The two new algorithms are proposed out of considerations on the features of NOMA system with a successive interference cancellation (SIC) receiver, and take the users' channel conditions into account, which is pairing the users with the most distinctive channel conditions. Analytical and simulation results demonstrate that the new algorithms can improve system capacity greatly compared to the existing algorithms while guarantee the user fairness. Furthermore, we discuss to apply SIC with interference rejection combining (IRC) receiver into the NOMA/MIMO system, which is a possible extension of NOMA system combined with multi-antennas, and simulation result shows that the performance gain of IRC-SIC over MRC-SIC can achieve about 2dB in high signal-to-noise ratio situation.