Pulse shaping with bireciprocal wave digital lattice filters

We show that bireciprocal wave digital lattice filters (BWDLF) can be used very favourably as pulse shaping filters in digital communications. A new approach, at least in this context, is presented; it copes with the phase distortions which are caused by the nonlinear phase response of BWDLFs. This approach is characterized by minimizing the energy of the intersymbol interference with a finite impulse response (FIR) filter instead of trying to equalize directly the nonlinear phase with an appropriate allpass filter. Simulation results demonstrate that the filter orders and required operations per time interval at both the transmitter and receiver can be reduced compared with conventional solutions. As a new option, the effort can be split asymmetrically between transmitter and receiver.