A simulation framework based on a physical-layer based abstraction to predict physical layer performances and to compare different forward error correcting (FEC) codes is presented. This framework is used to jointly design interleaving and FEC schemes for free space optical link. A sub-class of regular Low-Density Parity-Check codes is shown to be an interesting alternative to current space communication standard for optical links that require low error floor and high decoder throughput. End-to-end simulations show the feasibility of error free link from a LEO satellite to a high complexity ground station at 25Gbits/s and from a LEO satellite to low complexity optical ground station at 10 Gbits/s. The proposed protection scheme is composed of FG LDPC code and a bit interleaver to span the burst of errors.
Architecture of a 10 Gbauds link between new high complexity optical ground station suitable for feeder link and a geostationary satellite is described. Such link is tested in laboratory environment with emulation of power fluctuations representative of the power budget between the optical ground station and the satellite. The software and hardware developed reach the expected performance and the system performance model is demonstrated to be accurate at 1 dB.
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