Efficient Helicopter-Satellite Communication Scheme Based on Check-Hybrid LDPC Coding

• 来源期刊: 清华大学学报自然科学版（英文版）
• 年，卷（期）: 2018,（3）
• 页码范围: 323-332
• 页数: 10页
• 语种: 英文
• DOI: 10.26599/TST.2018.9010038

摘要

When implementing helicopter-satellite 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 helicopter-satellite 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 helicopter-satellite 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 helicopter-satellite channels in this paper achieves more than 25％ bandwidth efficiency improvement, compared with the FEC scheme that uses QC-LDPC codes.