Equalization demodulation arrangement for binary continuous phase angle modulated data signal with modulation index 0.5

摘要

A device for equalising and demodulating binary continuous phase modulated CPM data signals with a modulation index of 0.5 comprises a baseband converter (10) for generating the quadrature components (I, Q) of a received CPM signal in the baseband and an equaliser/detector (30). Provided between baseband converter (10) and equaliser/detector (30) is a preprocessing unit (20) for carrying out a signal processing which is equivalent to a continously phase-rotating of the CPM signal in the baseband represented by the quadrature components (I, Q) in discrete steps of 90 DEG per bit interval of the binary data signal contained in the CPM signal. Introducing said preprocessing unit (20), which can be achieved at small expense, makes it possible to use a relatively simple, conventional equaliser/detector for binary pulse amplitude modulated (PAM) signals to equalise and detect binary CPM signals which are distorted when received. …IMAGE…