Abstract

In this paper, an analytical expression of nonlinear power amplifier characteristic based on orthogonal polynomials method for filter bank multicarrier modulation (FBMC) systems is proposed. FBMC has been widely deployed for broadband wireless communications. Nevertheless, one of the drawbacks of the FBMC systems is a large peak-to-average power ratio (PAPR) in its time domain signal. This leads to a nonlinear distortion when the signal is passed through a high power amplifier (HPA) of a transmitter. In this paper, an analytical computation of the HPA characteristic based on the orthogonal polynomial method for baseband uniform, exponential, and Rayleigh input distribution with odd and even polynomial coefficient order is proposed. The HPA modelling error comparison between the proposed orthogonal method and the conventional polynomial method is investigated at a different IBO. Simulation results show that the proposed orthogonal polynomial method is superior to the conventional polynomial method. Moreover, the HPA modelling error of the proposed orthogonal polynomial method for uniform input distribution yield better result compared with the exponential and the Rayleigh input distribution case.

Highlights

  • It is well-known that the filter bank multicarrier modulation (FBMC) technique, which is the multicarrier techniques-based communication, will play an important solution for achieving high data rate 5G communications [1]

  • SIMULATION RESULTS based on a computer simulation, the performance of the derived high power amplifier (HPA) characterization is evaluated in terms of a HPA modelling error, which is verified by a normalized mean squared error (NMSE)

  • At the polynomial order 11, the HPA modelling error of the uniform, the exponential and the Rayleigh based-orthogonal polynomial method is equal to -10 dB, -6.8 dB and -6 dB, respectively

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Summary

INTRODUCTION

It is well-known that the filter bank multicarrier modulation (FBMC) technique, which is the multicarrier techniques-based communication, will play an important solution for achieving high data rate 5G communications [1]. In [5], a complete theoretical characterization of the nonlinear HPA for FBMC systems has been proposed by using a polynomial fitting method, which can be utilized to any type of HPA models. In [6], the effect of the nonlinear based on memory-less HPA models have been studied and an analysis BER performance of FBMC schemes based on the polynomial approximation method have been proposed. There are researches regarding the analytical HPA characteristic expression based on the polynomial mathematic method. The basic polynomial approximation could not be well suited comparing with other mathematic method [7] This fact motivates us to propose an analytical expression of nonlinear power amplifier characteristic based on the orthogonal polynomial method for FBMC system.

HPA Model
The Nonlinear HPA Characterization Based on the Polynomial Method
The Exponential Based-Orthogonal Polynomial Method
The Rayleigh Based-Orthogonal Polynomial Method
SIMULATION RESULTS
CONCLUSIONS
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