Performance evaluation of OFDM with a nonlinear distortion compensation technique using partial transmit sequence and predistortion

Abstract

As a conventional method of compensating the nonlinear distortion in OFDM (orthogonal frequency division multiplexing), LCP‐COFDM (linearized constant peak‐power coded OFDM) has been proposed. In LCP‐COFDM, however, the signal power is reduced by the linear compression (constant peak amplitude) process, which degrades the noise immunity and degrades the BER (bit error rate) characteristic. Consequently, this paper proposes a nonlinear distortion compensation scheme in which the BER is improved by combining LCP‐COFDM with the partial transmit sequence. As a result of performance evaluation by computer simulation, it is shown that the proposed method can improve the BER with nearly the same out‐band radiation reduction as conventional LCP‐COFDM. © 2004 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 87(6): 34–42, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.10129

Look-Up-Table Predistortion Technique Based on Polynomial Nonlinearity Compensation in OFDM Systems

“…The relation between AM/AM and AM/PM conversions can be found in many literatures. Moreover, for some common PAs such as solid-state PA (SSPA), the AM/PM conversion can even be ignored [8]. And so, for simplifying the analysis, we will only take the AM/AM conversion into the consideration in the remainder of this paper.…”