Asymptotic Performance Analysis of GSVD-NOMA Systems With a Large-Scale Antenna Array

• Published in: IEEE transactions on wireless communications Vol. 18; no. 1; pp. 575 - 590
• Main Authors: Chen, Zhuo, Ding, Zhiguo, Dai, Xuchu, Schober, Robert
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.01.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna arrays; Antennas; Asymptotic properties; Bandwidths; Base stations; Downlink; Generalized singular value decomposition (GSVD); Matrix decomposition; MIMO communication; multiple-input multiple-output (MIMO); NOMA; non-orthogonal multiple access (NOMA); Nonorthogonal multiple access; Performance measurement; Receiving antennas; Singular value decomposition
• ISSN: 1536-1276; 1558-2248
• DOI: 10.1109/TWC.2018.2883102

This paper considers a multiple-input multiple-output (MIMO) downlink communication scenario with one base station and two users, where each user is equipped with <inline-formula> <tex-math notation="LaTeX">m </tex-math></inline-formula> antennas and the base station is equipped with <inline-formula> <tex-math notation="LaTeX">n </tex-math></inline-formula> antennas. To efficiently exploit the spectrum resources, we propose a transmission protocol which combines generalized singular value decomposition (GSVD) and non-orthogonal multiple access (NOMA). The expected data rates achieved by the two users are adopted as performance metrics for the evaluation of the proposed GSVD-NOMA scheme. In particular, we first characterize the limiting distribution of the squared generalized singular values of the two users' channel matrices for the asymptotic case, where the numbers of transmit and receive antennas approach infinity. Then, we calculate the expected normalized individual rates of the users in the considered asymptotic regime. Furthermore, we extend the proposed GSVD-NOMA scheme to the general MIMO downlink communication scenario with more than two users. To this end, we propose a hybrid multiple access approach, where the base station divides the users into different groups, the proposed GSVD-NOMA scheme is implemented within each group, and different groups are allocated orthogonal bandwidth resources. Finally, numerical results are provided to validate the effectiveness of the proposed GSVD-NOMA protocol and the accuracy of the developed analytical results.