The specification and design of filters for amplitude and phase modulated data transmission systems

A baseband pre-envelope model is used to define the important performance parameters of amplitude, and phase modulation of digital transmission systems as far as the system´s filters are concerned. Typical figures are given of these parameters and a filter specification is drawn up. Theoretical characteristics are derived which optimize the performance parameters and form target responses for practical filters. A simple example is given of this method. A low-pass prototype shaping filter and a phase equalizer is obtained which meets the typical specification.