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Sociedade Brasileira de Telecomunicações

Tx-Rx Initial Access and Power Allocation for Uplink NOMA-mmWave Communications


This paper investigates the performance of non-orthogonal multiple access (NOMA) in a 2-user uplink millimeter-wave (mmWave) network. In particular, we consider a scenario where both the Base Station (BS) and the User Equipment (UE) are equipped with a uniform linear array (ULA). We consider beamforming both in the BS and the UE without any knowledge of the channel state information (CSI). As the power allocation intertwines with Initial Access (IA), in this paper, a joint IA and power allocation problem is considered to optimize the achievable sum rate with minimum rate constraint for each user. To solve this non-convex problem, we divide it into two optimization sub-problems (IA and Power Allocation), which are solved using Particle Swarm Optimization (PSO). Extensive simulations are conducted to compare the achievable sum rates of the NOMA and OMA systems. Results show that the proposed solution outperforms the OMA system.

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