Abstract:
In the fifth generation (5G) of wireless communication systems, hitherto unprecedented requirements such as high spectral efficiency, massive connectivity, and low latenc...Show MoreMetadata
Abstract:
In the fifth generation (5G) of wireless communication systems, hitherto unprecedented requirements such as high spectral efficiency, massive connectivity, and low latency must be satisfied. As a promising solution to address these challenges, non-orthogonal multiple access (NOMA) has been actively investigated in recent years. Unlike conventional orthogonal multiple access (OMA) schemes, the key idea behind NOMA is to support multiple users by non-orthogonal resource allocation and hence introduce a controllable amount of inter-user interference that can be mitigated with the aid of sophisticated multi-user detectors at the cost of increased receiver complexity. Recently, various novel NOMA schemes have been extensively investigated for 5G, such as power-domain NOMA and code-domain NOMA, including multiple access solutions relying on low-density spreading, sparse code multiple access, lattice partition multiple access, multi-user shared access, as well as pattern division multiple access. Moreover, standardization work on NOMA has been started in the Third Generation Partnership Project (3GPP) under the name multi-user superposition transmission (MUST). The NOMA principle has also been recently standardized by the next generation digital TV standard ATSC 3.0 under the term layered division multiplexing (LDM), and related field test results have demonstrated significant gains in spectral efficiency. This Special Issue aims to not only serve as a collection of new ideas and recent developments addressing the challenges arising in future 5G cellular networks employing NOMA, but also inspire researchers to contribute to this promising field. This Special Issue consists of 15 articles, covering a wide range of topics on resource allocation, signal processing, coordinated multipoint (CoMP), and so on. The special issue articles are briefly summarized.
Published in: IEEE Wireless Communications ( Volume: 25, Issue: 2, April 2018)