Outage Analysis of TAS-NOMA Systems With Multi-Antenna Users Over {\alpha}-{\mu} Fading
Fernando D. Almeida Garc\'ia, Maria C. Luna Alvarado, Lenin P. Jim\'enez Jim\'enez, Gustavo Fraidenraich, Michel D. Yacoub, Nathaly V. Orozco Garz\'on, Jos\'e D. Vega-S\'anchez, Henry R. Carvajal Mora
TL;DR
This paper provides a comprehensive outage performance analysis of TAS-NOMA systems with multi-antenna users over {\
Contribution
It introduces exact and asymptotic outage probability expressions for TAS-NOMA with multiple combining schemes over generalized fading.
Findings
TAS enhances far user's performance.
MRC outperforms EGC in outage probability.
Imperfect SIC causes quantifiable performance loss.
Abstract
This paper analyzes the outage performance of downlink NOMA systems with transmit antenna selection (TAS) and multi-antenna users over {\alpha}-{\mu} fading. Maximal-ratio combining (MRC) and equal-gain combining (EGC) are considered, with imperfect successive interference cancellation (ipSIC) explicitly modeled. Exact closed-form outage probability (OP) expressions and asymptotic results are derived, offering insights into diversity and coding gains. Simulations validate the analysis, showing that TAS improves the far user's performance and that MRC outperforms EGC. The results also quantify the loss from ipSIC, and highlight the impact of power allocation on joint OP. The proposed framework serves as a unified tool for evaluating TAS-NOMA systems under generalized fading, providing design insights for B5G/6G networks.
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