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Peak-to-Average Power Reduction in Digital Television Transmitters Jean Armstrong

Summary: Peak-to-Average Power Reduction in Digital Television Transmitters
Jean Armstrong
Department of Electronic Engineering, La Trobe University, Victoria, Australia
Orthogonal Frequency Division Multiplexing (OFDM) is
one of the modulation techniques used in digital video
broadcasting systems. A significant disadvantage of
OFDM is that it has a high peak-to-average power ratio
(PAPR). This means that the output amplifiers of digital
television transmitters must be designed to handle signals
that are far in excess of the mean levels. These amplifiers
are expensive. One way to reduce the PAPR is to
digitally limit the peak value before the signals reach the
amplifier. Various clipping techniques have been
described in the literature. This paper describes the
application of the most effective of these techniques to the
European digital video broadcasting system. It is shown
that the PAPR can be reduced without significant
increase in bit error rate. In practical systems, amplifier


Source: Armstrong, Jean - Department of Electrical and Computer Systems Engineering, Monash University


Collections: Engineering