Feedforward Amplifiers for Wideband Communication Systems has
been possible thanks to the research carried out throughout several
years in the field of the linearization techniques applied to
digital communication systems, particularly to those with high
spectral efficient modulation techniques.
The wireless telecommunications are more and more demanded for
the Information Society. Such requirements are reflected as a great
many of communication standards with specific coverage applications
and, above all, with higher and higher data transmission rates.
The electromagnetic spectrum, nevertheless, is a scarce asset
that can not be spread and despite the increasingly tendency to
transmit in higher frequencies, the bandwidths assigned to each
application are always exploited to the limit.
Feedforward Amplifiers for Wideband Communication Systems merges
in the need of developing frequency efficient modulations with
widespread codification techniques that result in wideband
communication systems, with strict regulations in the usable
frequency bandwidths and tight restrictions in the spurious
emissions over the remaining spectrum.
The radio frequency transmitters do not remain impassive to
those changes, especially the power amplifiers, which efficiency
and linearity directly determines the correct performance of the
entire transmission system. The linearity specifications are
commonly fixed by the telecommunication standards while the
efficiency rates directly strikes the commercial viability of these
transmitters.
Feedforward Amplifiers for Wideband Communication Systems tries
to put into practice the Feedforward linearization technique, aimed
at improving either the linearity or efficiency parameters of power
amplifiers, just intended for achieving a trade-off between the
distortion specifications of the telecommunication standards and
the efficiency enhancement of the transmission systems, which set,
respectively, the linearity and the output level requirements of
power amplifiers.
This challenge is enshrined in one of the present wideband
communication systems, but all the recommended design guidelines
are perfectly reusable in the future wideband applications.
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