Linearized Constant Peak-Power Coded OFDM Transmission for Broadband Wireless Access Systems

Shuta UWANO  Yoichi MATSUMOTO  Masato MIZOGUCHI  Masahiro UMEHIRA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E82-B   No.12   pp.1932-1938
Publication Date: 1999/12/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Multimedia Mobile Communication Systems)
Category: 
Keyword: 
OFDM,  PAPR,  nonlinear distortion,  predistorter,  out-of-band emission,  

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Summary: 
Orthogonal frequency division multiplexing (OFDM) signals suffer nonlinear distortion within the transmitter, in the high-power amplifiers in particular. This paper proposes a nonlinear distortion compensation technique for OFDM signals, which incorporates a baseband predistortion with a constant peak-power OFDM (CP-OFDM). CP-OFDM fixes the envelope-peak amplitude to a constant value while maintaining the linearity of the inverse fast Fourier transform (IFFT) outputs; consequently, the baseband predistorter entirely compensates the nonlinear distortion. Simulation and experimental results verify that the proposed technique significantly reduces out-of-band power emission and adjacent channel interference (ACI) more than 10 dB respectively.