PERFORMANCE OF NARROW-BAND CPM SYSTEMS WITH LIMITER-DISCRIMINATOR-INTEGRATOR DETECTION AND DECISION FEEDBACK EQUALIZATION IN MOBILE RADIO CHANNELS

A completely analytical approach is presented to achieve error probabi lity analysis of limiter-discriminator-integrator (LDI) detection of b inary continuous-phase modulation in a land mobile radio channel chara cterized by Rayleigh fading and Doppler effects. Optimum choice of the post-detection integration time is carried out when varying both syst em parameters and propagation characteristics, namely the Doppler shif t. The improvements obtainable by means of decision feedback equalizat ion (DFE) are also considered, in the presence of error propagation. T he algorithm pointed out allows a very general analysis, which can be applied both to a partial and a full response modulation pulse, with n arrowband IF filter and multipath propagation. This leads to the optim ization of various system parameters, such as filter bandwidth, the mo dulation index, and the post-detection integration time, whatever the choice of the modulation pulse.