Improving spectral efficiency of DVB-S2 by using signals with controlled intersymbol interference and finite pulses
This paper considers the formulation and solution of the optimization problems for pulse synthesis for multicomponent bandwidth-effective signals taking into account a given frequency mask. A solution is proposed for various types of optimization problems, including maximizing the free Euclidean distance and minimizing the partial correlation coefficients. The frequency mask and other parameters for error correcting LDPC and BCH encoders are taken from the DVB-S2 standard. A simulation model of the DVB-S2 system is proposed, in which RRC pulses are replaced by obtained finite optimal pulses to improve the bandwidth efficiency of the system. The simulation results show that the transition from RRC pulses to multicomponent optimal pulses leads to an increase of bandwidth efficiency by 10 %, but the system suffers the energy losses of about 0.1 and 0.25 dB for QPSK and 8PSK, respectively.