Application of QC-LDPC codes in UAV communication system

Abstract: In dynamic aerial environments, wireless communication sys-tems using unmanned aerial vehicles (UAVs) are susceptible to atmospheric changes, which lead to reduced spectral efficiency and communication reliability. To enhance system performance, this paper proposes a communication scheme based on the combination of Quasi-Cyclic Low-Density Parity-Check (QC-LDPC) codes and high-order modulation formats such as M-QAM. Considering different UAV flight altitudes and signal attenuation, the system is evaluated over a Rayleigh fading channel. Simulation results show that the QC-LDPC coded M-QAM scheme significantly reduces the bit error rate (BER) compared to uncoded modulation, particularly under severe fading conditions. Additional analytical analysis confirms the robustness and applicability of the proposed approach for real-time UAV communication tasks.

Keywords: unmanned aerial vehicle, quadrature amplitude modulation, low-density parity-check codes, channel coding