241 research outputs found
Investigation on Evolving Single-Carrier NOMA into Multi-Carrier NOMA in 5G
© 2013 IEEE. Non-orthogonal multiple access (NOMA) is one promising technology, which provides high system capacity, low latency, and massive connectivity, to address several challenges in the fifth-generation wireless systems. In this paper, we first reveal that the NOMA techniques have evolved from single-carrier NOMA (SC-NOMA) into multi-carrier NOMA (MC-NOMA). Then, we comprehensively investigated on the basic principles, enabling schemes and evaluations of the two most promising MC-NOMA techniques, namely sparse code multiple access (SCMA) and pattern division multiple access (PDMA). Meanwhile, we consider that the research challenges of SCMA and PDMA might be addressed with the stimulation of the advanced and matured progress in SC-NOMA. Finally, yet importantly, we investigate the emerging applications, and point out the future research trends of the MC-NOMA techniques, which could be straightforwardly inspired by the various deployments of SC-NOMA
Application of Non-Orthogonal Multiple Access in LTE and 5G Networks
As the latest member of the multiple access family, non-orthogonal multiple
access (NOMA) has been recently proposed for 3GPP Long Term Evolution (LTE) and
envisioned to be an essential component of 5th generation (5G) mobile networks.
The key feature of NOMA is to serve multiple users at the same
time/frequency/code, but with different power levels, which yields a
significant spectral efficiency gain over conventional orthogonal MA. This
article provides a systematic treatment of this newly emerging technology, from
its combination with multiple-input multiple-output (MIMO) technologies, to
cooperative NOMA, as well as the interplay between NOMA and cognitive radio.
This article also reviews the state of the art in the standardization
activities concerning the implementation of NOMA in LTE and 5G networks.Comment: to appear in IEEE Communications Magazin
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