NOMA ( Eng. N on- Othogonal Ultiple Access ) is a non-orthogonal multiple access method in 5th generation ( 5G ) cellular communication systems.
The NOMA method provides that at the same time, at the same frequencies with the same methods of spreading the spectrum and coding the signals, multiple access to the network based on the distribution of signal powers can be provided. In other words, NOMA uses a power domain for multiple access, in which different power levels are used to serve different users.
It is believed that in this case, each user in NOMA can use the entire bandwidth of the network access channel during the entire communication time, due to which a reduction in delays is achieved, and the user data transfer rate can be increased.
Content
History
At its core, the NOMA method uses the principle of hierarchical modulation ( English H ierarchical M odulation , HM) [1] [2] . Its origins originate in the so-called modulation with multiple resolution ( eng. M ulti- resolution M odulation , MRM) [3] [4] [5] .
In 1972, Carpet ( cover ) introduced the theory of transmission with several resolving powers [5] [6] , the application of which was described in detail in 1974 [7] It was shown that if one source transmits its information to several receivers with different channel conditions, the use of a multiple-resolution transmission scheme has the advantage [5] . Based on these results, after almost 20 years, in 1993, Fazel introduced the concept of multiple resolution modulation (MRM), which was combined with multi-level coding schemes [3] .
In 1995, hierarchical modulation was proposed for satellite communications (since this year, the MRM scheme has become identified with HM in the literature), and in 1997 for systems with COFDM signals [5] . Since then, this type of modulation has been constantly improved and expanded its application. There have been repeated attempts to implement hierarchical modulation in different data transfer standards.
It is significant that the 3GPP association included the hierarchical modulation method in LTE- A, due to its spectral efficiency, in this standard it is known as multiuser superposition transmission (MUST), which is a special version of NOMA [8] .
See also
- 5G
Notes
- ↑ Zubarev Yu.B., Krivosheev M.I., Krasnoselsky I.N. Digital television broadcasting. Basics, methods, systems. - M: Radio Research Institute (NIIR). - 2001 .-- C. 79 -86.
- ↑ H. Jiang, PA Wilford, "A hierarchical modulation for upgrading digital broadcast systems", IEEE Trans. Broadcast , vol. 51, no. 2, pp. 223-229, Jun. 2005.
- ↑ 1 2 K. Fazel, M. Ruf, "Combined multilevel coding and multiresolution modulation", Proc. Tech. Program Conf. Rec. IEEE Int. Conf. Commun. (ICC) , vol. 2, pp. 1081-1085, May 1993.
- ↑ V. Engels, H. Rohling, "Multi-resolution 64-DAPSK modulation in a hierarchical COFDM transmission system", IEEE Trans. Broadcast , vol. 44, no. 1, pp. 139-149, Mar. 1998
- ↑ 1 2 3 4 H. Sun, C. Dong, SX Ng, L. Hanzo, "Five decades of hierarchical modulation and its benefits in relay-aided networking", IEEE Access , vol. 3, pp. 2891-2921, 2015.
- ↑ TM Cover, `` Broadcast channels, IEEE Trans. Inf. Theory, vol. 18, no. 1, pp. 2-14, Jan. 1972.
- ↑ P. Bergmans and TM Cover, `` Cooperative broadcasting, IEEE Trans.Inf. Theory, vol. 20, no. 3, pp. 317-324, May 1974.
- ↑ TELCOMA GLOBAL | Non-Orthogonal Multiple Access (NOMA) for 5G Systems . telcomaglobal.com . Date of appeal September 13, 2018.
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