From Newtec Senior Engineer Guido Verfaillie –

“The overall performance of the communication system is improved by applying the described method of predistortion since the satellite TWTA is now operated closer to saturation (less IBO and OBO improves up and downlink Es/No) and the receiver degradation (ISI) due to the non-linear channel is decreased at the optimum (minimum total D/L degradation) operating point. The predistortion tables are calculated from given AM-AM and AM-PM characteristics (via web interface) and stored in the modulator.”

Please download the complete White Paper here – white_paper_equalising_and_predistortion_R3

From Newtec market development director Joost Verbrugge –

“As mobile TV becomes accessible to mass markets, dedicated broadcast networks will be required to deliver television signals to handheld and mobile devices. This paper describes a number of basic design considerations for such networks. Satellite distribution of television content to the terrestrial transmission towers is proposed as a cost-effective way to realize rapid deployment of mobile TV services over large areas.”

Please download the complete White Paper here – white_paper_mobile_TV-Networks_R3

From Newtec Senior Engineer Guido Verfaillie –

“The DVB-S2 standard as described in ETSI EN 302 307 is based on powerful error correcting codes, a wide range of code rates, 4 constellations and 3 roll-off factors. The QPSK and 8PSK modulation schemes can be operated close to or at saturation, but 16- and 32APSK modulated signals show larger envelope variations and are more sensitive to channel impairments due to non-linearities present in the chain. The power efficiency of the latter modulations can be improved by introducing predistortion on the transmit data and avoiding large IBO/OBO values in this way. Linear distortions caused by amplitude and group delay variations over the signal bandwidth can be minimised by equalising.”

Please download the complete White Paper here – White_paper_Improving_the_transponder_utilisation_February2008

From Newtec’s Joost Verbrugge – Market Development Director Broadcast Solutions, comes this Whitepaper -

“The conversion from analog to digital television confronts Broadcast Network Operators with new challenges. Networks need to be upgraded and are often redesigned to meet the coverage expectations for digital TV. Savings on power consumption are now possible by using more transmitter points, all transmitting on the same frequency in a so-called Single Frequency Network.”

Please download the complete White Paper here – White_paper_SatReach_R1
Newtec’s DVB-S-S2 V5.4 Calculator is available for download here – Newtec_DVB-S-S2_calculator_v5.4