Department of Electronic Engineering, Tsinghua University, Beijing100084, China
EDA Laboratory, Research Institute of Tsinghua University in Shenzhen, Shenzhen518057, China.
School of Information Science and Technology, Tsinghua University, Beijing100084, China.
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Abstract
When implementing helicoptersatellite communications, periodical interruption of the received signal is a challenging problem because the communication antenna is intermittently blocked by the rotating blades of the helicopter. The helicoptersatellite channel model and the Forward Error Control (FEC) coding countermeasure are presented in this paper. On the basis of this model, Check-Hybrid (CH) Low-Density Parity-Check (LDPC) codes are designed to mitigate the periodical blockage over the helicoptersatellite channels. The CH-LDPC code is derived by replacing part of single parity-check code constraints in a Quasi-Cyclic LDPC (QC-LDPC) code by using more powerful linear block code constraints. In particular, a method of optimizing the CH-LDPC code ensemble by searching the best matching component code among a variety of linear block codes using extrinsic information transfer charts is proposed. Simulation results show that, the CH-LDPC coding scheme designed for the helicoptersatellite channels in this paper achieves more than 25% bandwidth efficiency improvement, compared with the FEC scheme that uses QC-LDPC codes.
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Wang P, Yin L, Lu J. Efficient HelicopterSatellite Communication Scheme Based on Check-Hybrid LDPC Coding. Tsinghua Science and Technology, 2018, 23(3): 323-332. https://doi.org/10.26599/TST.2018.9010038