Joint Pilot and Payload Power Control for Uplink MIMO-NOMA with MRC-SIC Receivers

TL;DR

This paper introduces a joint pilot and payload power control scheme for uplink MIMO-NOMA systems with MRC-SIC receivers, effectively reducing error propagation and improving detection performance through optimized power allocation.

Contribution

It presents a novel joint power allocation method formulated as a nonconvex optimization problem and solved via geometric programming, specifically targeting error propagation mitigation in MIMO-NOMA.

Findings

The proposed scheme effectively reduces error propagation in MRC-SIC decoding.

Simulation results show improved detection performance, especially for users with moderate energy budgets.

The analysis confirms the scheme's ability to enhance overall system robustness.

Abstract

This letter proposes a joint pilot and payload power allocation (JPA) scheme to mitigate the error propagation problem for uplink multiple-input multiple-output non-orthogonal multiple access (MIMO-NOMA) systems. A base station equipped with a maximum ratio combining and successive interference cancellation (MRC-SIC) receiver is adopted for multiuser detection. The average signal-to-interference-plus-noise ratio (ASINR) of each user during the MRC-SIC decoding is analyzed by taking into account the error propagation due to the channel estimation error. Furthermore, the JPA design is formulated as a nonconvex optimization problem to maximize the minimum weighted ASINR and is solved optimally with geometric programming. Simulation results confirm the developed performance analysis and show that our proposed scheme can effectively alleviate the error propagation of MRC-SIC and enhance the detection performance, especially for users with moderate energy budgets.