Simplified coherent detection of CPM

A6s~uct-Thlspm~lavoidsthe complexmatched-filter bank required for optimal detection. Instead, two simple l o w p ? ~ filters are employed, followed by a sampler and a Viterbi algorithm that accounts for ISI. For representative modulations it shown that near-optimal performance can be achieved with just two samples per baud. ~ ( t ) = s ( t ) + n(t). The proposed receiver structure shown in Fig. 1 begins with normal IF filtering followed by quadrature withlocal fi cos(wct) and -fisin(wct) to get to baseband.