基于迭代結構的聯(lián)合信源信道GSM語音解碼
Iterative Source-Channel Decoding for GSM
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摘要: 由于算法復雜度和延遲的限制,語音編碼參數仍然保留了一定的冗余信息,這些冗余量表現為參數的非等概分布和時間相關性。該文在比特級上利用信源編碼參數的冗余信息在軟輸入、軟輸出信道解碼和信源參數估計之間進行迭代運算,并將此聯(lián)合解碼算法運用于GSM EFR系統(tǒng)。仿真結果表明此算法降低了編碼參數的BER,提高了解碼語音的信噪比,具有一定的可行性和有效性。Abstract: In speech signal transmission system, residual redundancy is still left in the parameters after source encoding. The redundancy includes non-uniform distribution and time correlation of subsequent frame. Exploiting the redundancy on bit-level, the paper is proposed iterative algorithm based on soft-in/soft-out channel and parameter estimation, and applies the algorithm to GSM EFR system. The result shows this method reduces the BER and improves SNR of decoded speech.
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