Showing papers by "Bernhard Spinnler published in 1999"

Method and apparatus for detecting CPM-modulated information symbols

Abstract: Demodulation of CPM-modulated information symbols which are demodulated after being transmitted through an AWGN channel, using only partial whitened matched filtering, whereby finite pulses are produced which, however, are still accompanied by interferences in the form of remaining colored noise which can be approximately converted into white noise by a successive additional whitening filter so that the noise power will be minimized. For correcting the accompanying symbol interferences, a sequence estimation with reduced number of states follows.

Method and system for detecting cpm-modulated information symbol

Abstract: PROBLEM TO BE SOLVED: To calculate optical frequency pulse and to supply finite pulse with a minimum phase to an output, in response to a frequency pulse by applying action of partial, white matching filtering to a demodulated signal and attenuating a signal pulse in a form of permitting a residue of remaining color noise. SOLUTION: A white filter W(z) 44 of a partial white matching filter 46 eliminates color noise caused by a matching filter G*(f) 42. Another minimum phase white filter F(z) 48 with a finite order number selectable arbitrarily eliminates a remaining color resulting noise interference/disturbance as much as possible. The white filter F(z) 48 is designed to minimize noise power in an output based on the given filter order number. The system employing the components above supplies a pulse with a minimum phase, that is corrected in response to the frequency pulse in use and attenuated in an optimum form. A noise which is superimposed additively is minimized, with respect to the length of a pulse which is arbitrarily selectable.