Enhancing User Capacity for NOMA Cell-Free Massive MIMO with Carrier Aggregation | ||
| Port-Said Engineering Research Journal | ||
| Article 6, Volume 29, Issue 2, June 2025, Pages 62-70 PDF (934.56 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/pserj.2025.329397.1373 | ||
| Authors | ||
| Eslam Ibrahim Khalil; SHERIF M. ABUELENIN; Islam E. Shaalan* | ||
| 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. | ||
| Keywords | ||
| Cell-Free Massive MIMO; Successive Interference Cancellation; Non-Orthogonal Multiple Access; Carrier Aggregation | ||
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