IPSTAR user terminal will be a low-cost, flexible and high performance two-way satellite terminal that works in conjunction with the Satellite and the Gateway. Air interface employing advanced waveforms on forward and return channels are optimized for the overall system efficiency.

The waveform for forward channel is based on TDM-OFDM technology that utilizes bandwidth and power more efficiently. The forward channel is optimized to accommodate multiple data rates, a variable number of users of different modulation formats and forward error correction coding. On the other hand, for the return channel is based on MF-TDMA technology for bursty traffic and dedicated allocation for high data rate applications.



The waveform is fixed to a more robust modulation to ensure link-availability at low transmission power. However, if higher transmission bit rates are required, the return channel can be configured to dedicated allocation behaving like a SCPC-Like (pre-assigned TDMA) channel that can support higher transmit data rates up to 4.0 Mbps at the expense of required additional transmit power from the user terminal.