A.L. Gelgor - Ph. D. (Eng.), Associate Professor, Department «Radio Engineering and Telecommunication systems», Peter The Great St.Petersburg Polytechnic University E-mail: a_gelgor@mail.ru A.I. Gorlov - Assistant, Department «Radio Engineering and Telecommunication systems», Peter The Great St.Petersburg Polytechnic University E-mail: anton.gorlov@yandex.ru

This paper proposes a modified DVB-S2 mode, which employs optimal finite pulses instead of RRC-pulses. Proposed optimal pulses provide the minimal bandwidth, comprising 99% of signal power, and chosen values of ISI level and signal peak-to-average power ratio (PAPR). We considered two sets of optimal solutions: finite pulses with the only ISI constraint and finite pulses with the only PAPR constraint. In the simulator, the transmitter included a LDPC encoder, an interleaver, a mapper, and a shaping filter; the receiver included the BCJR demodulator and the decoder closed in a loop thus implementing the turbo equalization approach. For a channel with additive white Gaussian noise, it has been shown that a transition from conventional RRC-pulses to optimal finite pulses leads to a reduction of bandwidth and energy consumptions. For pulses obtained under ISI level constraint, we have marked an optimal level of ISI providing minimal bandwidth and energy consumptions, thus proving a known threshold effect for FTN-signals, but in this work, it has been obtained with the channel coding taken into account.

 

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