Amplifier-Coupled Tone Reservation for Minimization of OFDM Nonlinear Distortion

TL;DR

This paper introduces an Amplifier-Coupled Tone Reservation algorithm that effectively reduces nonlinear distortion in OFDM signals by leveraging PA characteristics, outperforming existing methods in efficiency and distortion mitigation.

Contribution

It proposes a novel convex optimization-based tone reservation method that directly incorporates PA nonlinearities, improving distortion reduction over prior algorithms.

Findings

The proposed algorithm reduces nonlinear distortion power more effectively.

It requires fewer computations compared to state-of-the-art methods.

Simulation and measurement results validate its advantages.

Abstract

Nonlinear distortion of an OFDM signal is a serious problem when it comes to energy-efficient Power Amplifier(PA) utilization. Typically, Peak-to-Average Power Ratio(PAPR) reduction algorithms and digital predistortion algorithms are used independently to fight the same phenomenon. This paper proposes an Amplifier-Coupled Tone Reservation (ACTR)algorithm for the reduction of nonlinear distortion power, utilizing knowledge on thep redistorted PA characteristic. The optimization problem is defined. Its convexity is proved. A computationally-efficient solution is presented. Finally, its performance is compared against two state-of-the-art TR algorithms by means of simulations and measurements. The results show the proposed solution is advantageous, both in terms of nonlinear distortion power and the required number of computations.