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Method and apparatus for a spectrally compliant cellular communication system

  • US 20040043751A1
  • Filed: 04/07/2003
  • Published: 03/04/2004
  • Est. Priority Date: 12/20/1999
  • Status: Active Grant
First Claim
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1. A system for providing a data communication service over wireless radio links, the system dedicating at least one radio channel for data services only, and the dedicated channel not being used for providing a voice service, the system comprising:

  • a modulator, for modulating data to be transmitted over the dedicated channel, the modulator producing a modulated data signal having a bandwidth which is the same as modulated signal bandwidth of a voice signal modulated according to a digital wireless air interface standard for voice and data signal communication;

    a radio frequency upconverter, for upconverting the modulated data signal to a radio carrier frequency such that a channel spacing between the modulated data signal and other radio signals in the system is compatible with a channel spacing specified by the digital wireless air interface standard; and

    an encoder, for encoding the data prior to feeding the data to the modulator, the encoder being optimized for data services and using a different encoding scheme than an encoding scheme specified for voice and data signal communication by the digital wireless air interface standard.

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