Advanced techniques for spectrally efficient DVB‐S2X systems

Abstract

SUMMARYWe investigate different techniques to improve the spectral efficiency of systems based on the DVB-S2 standard, when the transmitted signal bandwidth cannot be increased because it has already been optimized to the maximum value allowed by transponder filters. We will investigate and compare several techniques involving different sections of the transceiver scheme. The techniques that will be considered include the use of advanced detection algorithms, the adoption of time packing, and the optimization of the constellation and shaping pulses. The low-density parity-check codes recently proposed for the evolution of the DVB-S2 standard will be considered, as well as the adoption of iterative detection and decoding. Information-theoretical analysis will be followed by the study of practical modulation and coding schemes.

Enhancement of DVB-S2 Network Stability and Performance for Mobile User Groups

“…When the actual transmit power crossed the mode's power level boundaries, the mode was adapted according to current situation of link and power. Similar result were reported by Ugolini et al (2014) who stated that the capacity for DVB-S2 is increased by 30% on DVB-S. The Applied Sci., 15 (9): 1184-1189 DVB-S2 supports multiple streams of mobile applications in audio, video and data which are compatible with Moving Picture Expert Group (MPEG), MPEG2 and MPEG4.…”

“…Also, Mignone (2004, 2006) pointed out that the new coding scheme in combination with available modulation modes in DVB-S2 allows operation within 0.7-1.2 dB of the theoretical Shannon limit. Recently, Ugolini et al (2014) stated that the capacity for DVB-S2 is increased by 30% on DVB-S. Also, DVB-S2 supports multiple streams of mobile applications in audio, video and data which are compatible with Moving Picture Expert Group (MPEG), MPEG2 and MPEG4. According to Doost et al (2014), the Adaptive Coding Modulation (ACM) dynamically sets individual stream modulation and protection parameters in real time environment and allows interactive service systems.…”

Receiver for FTN signaling in non-linear channel: Joint channel estimation and synchronization

“…Indeed, the ISI due to both the payload and the FTN signaling can be equalized within a joint model. In [7], the interest of such a signaling is demonstrated, supported by the study in [8] which highlighted the robustness of the FTN waveform in non-linear channel. Iterative MAP detection is implemented in the following of this paper.…”

“…In Figure 4, the filter considered at the receiver side is a partial matched filter which only matches the shaping filter h(t). In this paper, the considered model differs from the proposed model in [7] of which the filter at the receiver matches a reduced Volterra model taking into account the whole channel. By so doing, their model leads to a linear channel allowing detection on an Ungerboeck model [16].…”

Iterative adaptive signal predistortion for satellite communications

“…This paper focuses on single-carrier satellite communications. The single-carrier-per-transponder scenario allows to operate closer to the saturation, which improves the amplifier efficiency [11].…”