Integration of Backscatter Communication with Multi-cell NOMA: A Spectral Efficiency Optimization under Imperfect SIC

TL;DR

This paper introduces an optimization framework for enhancing spectral efficiency in NOMA backscatter communication networks, addressing power and reflection coefficient allocation under imperfect SIC, with promising numerical results.

Contribution

It presents a novel joint optimization approach for power and reflection coefficients in NOMA-BC networks considering imperfect SIC, improving spectral efficiency.

Findings

Proposed a decoupled optimization method for power and reflection coefficients.

Numerical results demonstrate improved spectral efficiency over traditional NOMA.

Effective solution using decomposition and KKT conditions.

Abstract

Future wireless networks are expected to connect large-scale low-powered communication devices using the available spectrum resources. Backscatter communications (BC) is an emerging technology towards battery-free transmission in future wireless networks by leveraging ambient radio frequency (RF) waves that enable communications among wireless devices. Non-orthogonal multiple access (NOMA) has recently drawn significant attention due to its high spectral efficiency. The combination of these two technologies can play an important role in the development of future networks. This paper proposes a new optimization approach to enhance the spectral efficiency of nonorthogonal multiple access (NOMA)-BC network. Our framework simultaneously optimizes the power allocation of base station and reflection coefficient (RC) of the backscatter device in each cell under the assumption of imperfect signal decoding. The problem of spectral efficiency maximization is coupled on power and RC which is challenging to solve. To make this problem tractable, we first decouple it into two subproblems and then apply the decomposition method and Karush-Kuhn-Tucker conditions to obtain the efficient solution. Numerical results show the performance of the proposed NOMA-BC network over the pure NOMA network without BC.