Design of Check-Hybrid LDPC Codes for Data Communications over Helicopter-Satellite Channels

A class of check-hybrid low-density parity-check (CH-LDPC) codes is designed and implemented to mitigate the problem of periodical signal blockage over the helicoptersatellite channels. The CH-LDPC code is derived by replacing one layer check nodes of a quasi-cyclic LDPC (QC-LDPC) code by simplex code constraints or first-order Reed-Muller (RM) code constraints, based on the property that the check matrix of the QC-LDPC code has a layered structure. Moreover, extrinsic information transfer (EXIT) functions are established to analyze the iterative decoding performance of the CH-LDPC codes. Simulation results show that, compared with the QCLDPC coding scheme, the CH-LDPC coding scheme designed in this paper achieves more than 25% bandwidth efficiency improvement over the helicopter-satellite channels.

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