Paradise Datacom has released their “FastLink”, a low-latency Low Density Parity Check (LDPC) feature that is now available in their entire line of satellite modem products. “FastLink” combines new implementations of 8QAM and low latency LDPC, providing vastly superior performance over previous versions, and rendering the older versions obsolete.
The performance of traditional forward error correction schemes represents a trade off between latency and coding gain. FastLink LDPC has been designed by Paradise engineers from the ground up to optimize latency and throughput, while giving coding gain that is close to the theoretical limits. FastLink LDPC matches or beats conventional LDPC and TPC across the board in relation to latency and coding gain, meaning potentially that no other FEC may ever be required, particularly as it is available on all Evolution and Quantum modems at all data rates. All Evolution and Quantum modems using FastLink will interoperate up to the maximum data rate for each model.
BPSK, QPSK, 8PSK, 8QAM and 16QAM modulations are all supported. The 8QAM is a new implementation that replaces Paradise’s previous 8QAM and has been specifically designed to optimize performance when used with FastLink LDPC. An Adaptive Coding and Modulation (ACM) option is also in development. This uses a feedback path from the receiver to the transmitter to respond to changes in channel conditions to optimize throughput by dynamically varying the modulation and FEC rate as required. And, FastLink LDPC is fully compatible with Paired Carrier.
