"High-capacity technology operating in the Ka-band offers major advantages over conventional satellite networks operating in Ku-band and lower frequencies, such as increased bandwidth and higher gain. Yet, diverse weather conditions have a greater impact in the Ka-band than at lower frequencies,” said Dr. Jürgen Letschnik, lecturer at Technical University of Munich. “With appropriate planning and implementation of well-designed ground equipment, there are ways to mitigate adverse weather effects. During this test, we were able to prove that WORK Microwave’s DVB-S2X modem is an effective solution.”
Due to the impact of rain fade and harsh weather conditions at higher transmission frequencies, ACM technology is a must within state-of-the-art Ka-band systems. During the field test, TUM deployed WORK Microwave’s AX-60 DVB-S2X and SK-IP DVB-S2 modems on the same satellite link and transponder to directly compare the performance of legacy and next-generation technologies. For the given link budget, ModCods of up to 256APSK could be used.
Throughout the test, regular weather circumstances and rain fade events occurred. The DVB-S2X technology showed an advantage for both clear sky conditions and rain fade events. TUM found that the overall data rate, even with rain fade, is higher with DVB-S2X than DVB-S2 equipment since DVB-S2X supports higher modulation schemes of up to 256APSK. WORK Microwave’s AX-60 modem supports the DVB-S2X standard and advanced features such as higher modulation schemes, a finer granularity of ModCods, and cutting-edge filtering. ACM technology within the modem optimizes data throughput according to the current link situation and receiving conditions (e.g., rain events). As a result, utilization of the transponder resources and the system capacity increases.