An adaptive pre-distorter for the compensation of HPA nonlinearity

Dong Seog Han, Taewon Hwang

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

A high power amplifier (HPA) is used for the amplification of transmitting communication signals. However, it produces distortions by creating AM/AM and AM/PM modulations in the transmitting signal. Accordingly, this nonlinearity results in bandwidth expansion and nonlinear distortion in the in-band signal. This paper proposes an algorithm for the operation of a pre-distorter, which is composed of a look-up table (LUT), that can compensate for the distortion produced by an HPA. For the fast initialization of the LUT, an estimation algorithm is also proposed for the HPA characteristics. Furthermore, an adaptive algorithm based on the minimization of the mean square error is proposed to compensate for the time-varying property of an HPA. The performance of the proposed algorithm is analyzed by applying the algorithm to an 8-level Vestigial SideBand (VSB) modulation.

Original languageEnglish
Pages (from-to)152-157
Number of pages6
JournalIEEE Transactions on Broadcasting
Volume46
Issue number2
DOIs
Publication statusPublished - 2000 Dec 1

Fingerprint

Power amplifiers
Modulation
Nonlinear distortion
Adaptive algorithms
Mean square error
Amplification
Bandwidth
Compensation and Redress
Communication

All Science Journal Classification (ASJC) codes

  • Media Technology
  • Electrical and Electronic Engineering

Cite this

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An adaptive pre-distorter for the compensation of HPA nonlinearity. / Han, Dong Seog; Hwang, Taewon.

In: IEEE Transactions on Broadcasting, Vol. 46, No. 2, 01.12.2000, p. 152-157.

Research output: Contribution to journalArticle

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