Optimization of Shaping Pulse by Spectral Mask to Enhance DVB-S2

Abstract

This paper proposes new formulation and solution of optimization problems to synthesis bandwidth-efficient signals. Different types of optimization problems such as maximizing free Euclidean distance and minimizing partial correlation coefficients with and without capacity constraint are considered to obtain optimal pulses. Spectral mask is used as additional constraint for optimization problem instead of using bandwidth calculation. Spectral mask templates and other system parameters are taken from DVB-S2 standard. The optimization problems are solved for multicomponent signals which are the kind of partial response signals with finite pulses. BCJR demodulator is used in order to deal with intentional intersymbol interference (ISI). In presence of LDPC and BCH coding, the system with proposed optimal finite pulses provides 10% bandwidth efficiency gain and suffers energy losses of 0.1 dB and 0.25 dB compared to the system with RRC-pulses for QPSK and 8PSK respectively.