IEEE--Direct-Conversion Radio Transceivers for Digital Communications(by Abidi)

semico_ljj

Direct-Conversion Radio Transceivers for Digital Communications

Asad A. Abidi, Senior Member, IEEE

Abstract
  Direct-conversion is an alternative wireless receiver
architecture to the well-established superheterodyne, particularly
for highly integrated, low-power terminals. Its fundamental advantage
is that the received signal is amplified and filtered at
baseband rather than at some high intermediate frequency. This
means lower current drain in the amplifiers and active filters
and a simpler task of image-rejection. There is considerable
interest to use it in digital cellular telephones and miniature
radio messaging systems. This paper briefly covers case studies
in the use of direct-conversion receivers and transmitters and
summarizes some of the key problems in their implementations.
Solutions to these problems arise not only from more appropriate
circuit design but also from exploiting system characteristics,
such as the modulation format in the system. Baseband digital
signal processing must be coupled to the Analog front-end to make
direct-conversion transceivers a practical reality.

xileito

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yxy7968

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LAS.xs

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jumpyists

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jumpyists

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woainio

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