Mr. Curt Schurgers Profile

Curt Schurgers

at Univ of California Los Angeles

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Proceedings Article | 20 November 2001 Paper

Systematic approach to peak-to-average power ratio in OFDM

Curt Schurgers

Proceedings Volume 4474, (2001) https://doi.org/10.1117/12.448680

KEYWORDS: Orthogonal frequency division multiplexing, Signal to noise ratio, Receivers, Spatial light modulators, Interference (communication), Distortion, Modulation, Amplifiers, Telecommunications, Composites

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OFDM multicarrier systems support high data rate wireless transmission using orthogonal frequency channels, and require no extensive equalization, yet offer excellent immunity against fading and inter-symbol interference. The major drawback of these systems is the large Peak-to-Average power Ratio (PAR) of the transmit signal, which renders a straightforward implementation very costly and inefficient. Existing approaches that attack this PAR issue are abundant, but no systematic framework or comparison between them exist to date. They sometimes even differ in the problem definition itself and consequently in the basic approach to follow. In this work, we provide a systematic approach that resolves this ambiguity and spans the existing PAR solutions. The basis of our framework is the observation that efficient system implementations require a reduced signal dynamic range. This range reduction can be modeled as a hard limiting, also referred to as clipping, where the extra distortion has to be considered as part of the total noise tradeoff. We illustrate that the different PAR solutions manipulate this tradeoff in alternative ways in order to improve the performance. Furthermore, we discuss and compare a broad range of such techniques and organize them into three classes: block coding, clip effect transformation and probabilistic.

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