Abstract
The steadily developing number of users has achieved the test to distinguish an advantageous strategy for different access in upcoming wireless communication. It has been seen that non-orthogonal multiple access (NOMA) method gives far superior execution than orthogonal multiple access (OMA) procedure while exploiting the accessible assets. Interferences can be limited enough using successive interference cancellation (SIC) when actualized broadly, however it is normal situation in NOMA. But enormous usage increments the complexity of the framework and as a result energy effectiveness is decreased. To balance the detriments of NOMA procedure, interest in hybrid NOMA strategies has developed. Numerous new papers have proposed hybrid NOMA schemes as a reasonable alternative to moderate the disservices of NOMA. This paper plays out an investigation of the exhibition between hybrid NOMA systems such as CR-NOMA, U2X-NOMA, RIS-NOMA, HS-UAV NOMA, SCMA-NOMA and GFDM-NOMA. An examination of every one of these methods is led to recognize the best hybrid NOMA procedure for 5G and beyond wireless communication. The articulations for sum rate and outage probability have been determined for all the procedures. Through examination and reenactment results it is found that U2X-NOMA gives the best exhibition regarding sum rate and outage probability among the six discussed schemes.
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