What is NOMA?

By Admin on

Non-Orthogonal Multiple  Access:

NOMA is an additional form for providing a multi-user access scheme. Future 5G communication systems need to support unprecedented requirements for the wireless access connection, targeting cell throughput capacities 1000 x of current 4G technology and round trip latency of about 1 msec. Towards this direction, three major 5G technologies named ultra-densification, millimeter wave, and massive multiple-input multiple- output, have attracted considerable attention in both industry and academia . In addition to these technological implications, physical layer issues such as transmission waveforms and multiple-access (MA) schemes should be reconsidered. A promising downlink MA scheme is the non-orthogonal multi ple access (NOMA) which achieves high spectral efficiencies by combining superposition coding at the transmitter with successive interference cancellation (SIC) at the receivers

                                    FIG : 5G TECHNOLOGY

The main novelty of this work is the investigation of the impact of PA on the fairness performance of the NOMA scheme. In particular, we study the PA problem in NOMA from a fairness standpoint under two main system assumptions: i) when user’s data rates are adopted to the channel conditions (perfect channel state information (CSI)), and ii) when users have fixed targeted data rates under an average CSI. Although the resulting optimization problems are both non-convex, we develop low-complexity bisection-based iterative algorithms that provably yield globally optimal solutions.

In addition to this NOMA, non-orthogonal multiple access is able to support more connections than other systems and this will become particularly useful in view of the massive projected increase in connectivity for 5G materialises


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