Mark Vanderaar

Two-Way Internet Over iPSTAR Using Advanced Error Correction and Dynamic Links

Two-way Internet service over satellite for consumers has proven so far to be too expensive to attract large numbers of subscribers. One way to reduce service cost is to increase the number of subscribers per satellite transponder by using advanced error correction and dynamic links (adaptive fade compensation). Customer Premise Equipment (CPE) modems and head-end modems have been developed by Efficient Channel Coding (ECC) using higher level modulation and advanced Turbo Product Codes (TPC) that, in conjunction with dynamic links, significantly increases the number of subscribers per transponder compare to fixed links with QPSK and Reed Solomon/Convolutional concatenated codes. This increase is from one and one half to four times depending on the RF frequency and the rain attenuation region. The Dynamic Link Assignment (DLA) system (patents pending) is being used by Shin Satellite Public Company (Shin Sat) to provide commercial Internet services in Asia using their existing Ku Band satellites. In late 2003, the iPSTAR spot-beam satellite will be launched and placed into the 120 degree East longitude orbit slot. Using the DLA system the iPSTAR information capacity will be up to 40 Gbps.