CAJ | 학술논문

针对LDPC编码的BICM-ID系统，建立了正规因子图模型。从消息更新规则的角度，运用变分方法统一解释了均匀重加权置信传播算法和标准置信传播算法。将均匀重加权方法提高性能的特点与置信传播的特性相结合，推导出均匀重加权迭代译码算法，讨论了边出现概率对算法性能的影响。分别在高斯白噪声信道和不同调制方式下进行仿真实验。结果表明，提出的均匀重加权迭代译码算法性能均优于标准置信传播和差分映射置信传播等迭代译码算法。
침대LDPC편마적BICM-ID계통，건립료정규인자도모형。종소식경신규칙적각도，운용변분방법통일해석료균균중가권치신전파산법화표준치신전파산법。장균균중가권방법제고성능적특점여치신전파적특성상결합，추도출균균중가권질대역마산법，토론료변출현개솔대산법성능적영향。분별재고사백조성신도화불동조제방식하진행방진실험。결과표명，제출적균균중가권질대역마산법성능균우우표준치신전파화차분영사치신전파등질대역마산법。
The LDPC coded bit-interleaved coded modulation iterative decoding ( BICM-ID) system was modeled by a normal factor graph. From the angle of the message update rule,uniformly reweighted belief propagation algorithm ( URW-BP ) and belief propagation algorithm ( BP ) are unified and interpreted as message passing algorithm by variation method. Combining the local nature of BP with the improved performance of URW-BP in graphs with cy-cles, the uniformly reweighted iterative decoding algorithm ( URID) was derived and the impact of edge appearance probabilities ( EAP ) on its performance discussed. Simulation results for AWGN and Rayleigh fading channel and different modulation illustrate the performance improvement of URID compared with other iterative decoding algo-rithms such as BP and Difference-Map BP ( DMBP ) algorithm.