Publication

A closed-form expression for the total degradation in OFDM systems

Stefano Rosati
2015
Journal Articles

Abstract

In this paper, building upon Bussgang's theorem, we present a new expression for the total degradation (TD) in OFDM systems. This novel expression is applicable to any high power amplifier (HPA) model. In case of ideal clipping HPA model and for particular realizations of Rapp and Saleh HPA models, it and can be expressed in closed form. It enables a significant speed-up in computing TD, because it avoids end-to-end system simulations. As a consequence, it simplifies the evaluation of TD as a function of the back-off, yielding a more accurate evaluation of the optimum HPA back-off (i.e., the back-off value that minimizes TD). Numerical results show a perfect agreement between the proposed analytical framework and the Monte Carlo simulation results.Copyright (c) 2014 John Wiley & Sons, Ltd.

Official source

https://infoscience.epfl.ch/entities/publication/60a050cc-1d09-4e38-b6e5-d722e8132f28

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Stefano Rosati
2015
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/60a050cc-1d09-4e38-b6e5-d722e8132f28

About this result

Related concepts (13)

Audio power amplifier

An audio power amplifier (or power amp) is an electronic amplifier that amplifies low-power electronic audio signals, such as the signal from a radio receiver or an electric guitar pickup, to a level that is high enough for driving loudspeakers or headphones. Audio power amplifiers are found in all manner of sound systems including sound reinforcement, public address, home audio systems and musical instrument amplifiers like guitar amplifiers. It is the final electronic stage in a typical audio playback chain before the signal is sent to the loudspeakers.

Guitar amplifier

A guitar amplifier (or amp) is an electronic device or system that strengthens the electrical signal from a pickup on an electric guitar, bass guitar, or acoustic guitar so that it can produce sound through one or more loudspeakers, which are typically housed in a wooden cabinet. A guitar amplifier may be a standalone wood or metal cabinet that contains only the power amplifier (and preamplifier) circuits, requiring the use of a separate speaker cabinet–or it may be a "combo" amplifier, which contains both the amplifier and one or more speakers in a wooden cabinet.

Bass amplifier

A bass amplifier (also abbreviated to bass amp) is a musical instrument electronic device that uses electrical power to make lower-pitched instruments such as the bass guitar or double bass loud enough to be heard by the performers and audience. Bass amps typically consist of a preamplifier, tone controls, a power amplifier and one or more loudspeakers ("drivers") in a cabinet. While bass amps share many features with the guitar amplifiers used for electric guitar, they are distinct from other types of amplification systems, due to the particular challenges associated with low-frequency sound reproduction.

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