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在高斯噪声和随机删除同时存在的背景下,提出LDPC码度序列的稳定收敛条件,理论证明了高斯信道下阈值较高的度序列不适用于混合信道,并仿真验证了该结论。将随机粒子群算法和模拟退火算法相结合,不同删除概率下寻找到了一些高阈值混合信道的度序列,删除概率为40%时,度序列信噪比阈值最大可提高1.615 9 d B,适用于光记录、伴随窄带阻塞干扰的跳频通信等混合信道环境。
In the context of coexistence of Gaussian noise and random deletion, a stable convergence condition of LDPC code sequence is proposed. It is proved theoretically that Gaussian channel with higher threshold sequence is not suitable for hybrid channel. Simulation results verify this conclusion. Combining the PSO with simulated annealing algorithm, some high threshold mixed channel degree sequences are found under different deletion probabilities. When the deletion probability is 40%, the maximum threshold SNR of the sequence can be increased by 1.615 9 d B, which is suitable for Optical recording, hopping communication with narrowband jamming, and other mixed channel environments.