Enhancing User Capacity for NOMA Cell-Free Massive MIMO with Carrier Aggregation

Document Type : Original Article

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Dept. of Electrical Engineering, Port Said University, Port Said 42526, Egypt

Abstract

Cell-Free Massive Multiple Input Multiple Output (CF-mMIMO) is considered a leading technology to be enrolled in 6G Networks, offering larger capacity which will satisfy the higher rate requirements by the large number of User Equipment (UEs) in next-generation networks, as well as giving better macro-diversity while avoiding inter-cell interference encountered by collocated mMIMO. With Power Domain Non-Orthogonal Multiple Access (PD-NOMA), cell-free mMIMO is expected to support higher capacity for overloaded systems. While utilizing PD-NOMA for CF-mMIMO offers more capacity and also better spectrum efficiency compared to the usual Orthogonal Multiple Access (OMA) Cell-Free system, the achievable sum-rate is still limited by the induced interference from users within the same or different clusters leading to lower levels of Signal-to-Interference and Noise Ratio (SINR) at the receiver side. To remedy such a problem, we’re going to integrate Carrier Aggregation (CA) into PD-NOMA Cell-Free Massive MIMO system, offering additional frequency bands and thus giving higher rates. Simulation results have shown improvement by at least a factor of two in the sum-rate given compared to the case of no carrier aggregation.

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