Satnews Daily
September 21st, 2018

AsiaSat Secures Second U.S. Patent for Improving Spectrum Utilization for SATCOM

Asia Satellite Telecommunications Company Limited ( AsiaSat – SEHK: 1135 ) has received their second patent from the United States Patent and Trademark Office (USPTO), titled, “Methods and Systems for Improving Spectrum Utilisation for Satellite Communications” (US Patent No. 10,050,698 B2 ).

This new patent is about the methods and systems to mitigate the imbalance of uplink and downlink spectrum allocation in satellite communications. Through digitizing uplink spectrum with an onboard digital channelizing processor (DCP), unused Fixed Satellite Service (FSS) guard bands (a bandwidth for separating two adjacent communications channels without interfering each other) in the uplink spectrum, whether from the same band or different bands, such as C-, Ku- or Ka-band can be extracted, fully harvested and put into use.

This invention can provide huge benefits, given the imbalance of uplink and downlink spectrum allocation of the Ku-band frequency in the IT U (International Telecommunication Union) Region - 3 (Asia - Pacific) coverage.

According to the ITU Region - 3 allocation, the Ku- uplink spectrum has 750 MHz, whereas the downlink spectrum has 1,000 MHz, denoting that there is 250 MHz bandwidth in the downlink spectrum unpaired with its uplink spectrum.

This new patent grants a recovery of this unpaired spectrum, by installing an onboard DCP in the satellite payload to harvest the previously unused guard bands in the uplink spectrum. In conventional satellite payload design, guard bands of at least 10 percent of the spectrum bandwidth are reserved for channel isolation.

With the described methods and systems, the guard bands in the uplink spectrum can be harvested and put together as composite channels . While serving the purpose of maximizing the use of spectrum resources, the new available bandwidth can support customers in developing new applications that require flexibility and scalability, such as SCADA (Supervisory Control and Data Acquisition ) and IoT (Internet of Things) products.

Full patent specification is available at the AsiaSat website at this direct infolink...

Executive Comment

Dr. Roger Tong, CEO of AsiaSat, said that the spectrum for satellite communications is a scarce and valuable resource . The developments made by the company's strong engineering team have provided real-world value through the more efficient utilization of AsiaSat's spectrum resources. This is the kind of innovation that drives AsiaSat and the firm's staff to strive for the better, for both users, partners and their customers.