Interference State Estimation-Based LDPC Decoding Scheme Design for Slow FH System
Renzhi Wang, Kegang Pan, Ruixiang Zhao · 2021
Aiming at the problem of unsatisfactory performance of the low-density parity-check (LDPC) belief propagation decoding algorithm in the LDPC coded frequency hopping (FH) system when the interference state is unknown, an LDPC layered decoding scheme based on interference state estimation is proposed. The iterative feedback estimation mechanism is used to estimate the interference state of the hop according to the posterior message of the variable node in each hop obtained in each iteration, and then update the decoding prior probability message of the next iteration to realize the LDPC decoding under the interference state estimation Process. The simulation results show that the scheme has better decoding performance and decoding convergence. When the number of hop bits is greater than or equal to 10, the decoding performance is equivalent to the known interference state, and the complexity of the scheme is not enormous.