inLTEand5GNetworks创新.PDFVIP

A MANUSCRIPT SUBMITTED TO THE IEEE COMMUNICATIONS MAGAZINE 1 Application of Non-orthogonal Multiple Access in LTE and 5G Networks Zhiguo Ding, Yuanwei Liu, Jinho Choi, Qi Sun, Maged Elkashlan, Chih-Lin I and H. Vincent Poor Abstract 6 1 0 As the latest member of the multiple access family, non-orthogonal multiple access (NOMA) has been 2 t recently proposed for 3GPP Long Term Evolution (LTE) and envisioned to be an essential component of c O 5th generation (5G) mobile networks. The key feature of NOMA is to serve multiple users at the same 1 time/frequency/code, but with different power levels, which yields a significant spectral efficiency gain 3 over conventional orthogonal MA. The article provides a systematic treatment of this newly emerging ] T technology, from its combination with multiple-input multiple-output (MIMO) technologies, to coopera- I . tive NOMA, as well as the interplay between NOMA and cognitive radio. This article also reviews the s c state of the art in the standardization activities concerning the implementation of NOMA in LTE and 5G [ networks. 2 v 0 1 I. INTRODUCTION 6 8 0 Non-orthogonal multiple access (NOMA) has been recently recognized as a promising multiple access . 1 (MA) technique to significantly improve the spectral efficiency of mobile communication networks [1-4]. 1 5 For example, multiuser superposition transmission (MUST), a downlink version of NOMA, has been 1 : v proposed for 3rd generation partne