基于不同外信息處理方式的Turbo迭代譯碼研究
Study on Iterative Decoding of Turbo Codes with Extrinsic Information in Different Versions
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摘要: 針對離散無記憶高斯信道，該文深入剖析了不同外信息使用方式下的兩種對數(shù)域的Turbo碼迭代譯碼算法，并借助蒙特卡羅仿真，在相同的約束條件下對兩種算法的性能進(jìn)行了比較。經(jīng)過分析指出二者在本質(zhì)上是一致的，只是成員譯碼器對外信息使用權(quán)重的處理不同。最后對其進(jìn)行了統(tǒng)一的描述，并定量研究了迭代譯碼對外信息的依賴性。結(jié)果發(fā)現(xiàn)成員譯碼器對外信息的最佳依賴程度不受信噪比與迭代次數(shù)的影響。
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關(guān)鍵詞:
- Turbo碼;Log-MAP譯碼算法;迭代譯碼;外信息
Abstract: In this paper，based on various methods of using extrinsic information, two logarithmic iterative decoding algorithms of Turbo codes are anatomized clearly for a discrete memoryless Gaussian channel. With Monte Carlo simulation, performance of two algorithms is compared under the same constraint condition; after analysis it is proposed that they are identical in nature, the only difference is how to deal with scale of extrinsic information for component decoder to use. Finally, a united form is used to describe two algorithms and some research is done for the dependency on extrinsic information in iterative decoding numerically, from the result it is found that SNR and iterative number do not affect the best scale of extrinsic information used in component decoder. -
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