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題 名 | Low Complexity Turbo Decoders for Noncoherent FH/SS over Partial Band Jammed Channel |
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作 者 | Chang, Jui-chi; Cheng, Wen-chang; Huang, Yi-hung; | 書刊名 | Journal of Information Technology and Applications |
卷 期 | 2:4 2008.03[民97.03] |
頁 次 | 頁209-214 |
分類號 | 448.6 |
關鍵詞 | FH; SS; Turbo code; AGC; |
語 文 | 英文(English) |
英文摘要 | In this study, turbo codes were investigated in a slow frequency-hopped binary frequency shift keying spread spectrum (FH/BFSK-SS) system with partial band jamming and full-band thermal noise. A soft decision decoding metric which includes automatic gain control (AGC) is proposed for turbo code decoding with a non-coherent square law receiver of FH/BFSK. The study focused on the performance comparison of various reduced complexity turbo decoding algorithms using the above-mentioned soft decision decoding metric. These low complexity turbo decoding algorithms included Log-MAP, Max-Log-MAP and SOVA. From the simulation results, Log-MAP performed the best, but with the highest complexity. While, although SOVA performed the worst, it had the lowest complexity. Max-Log-MAP performed about 0.1dB worse than Log-MAP. The performance degradation was about 0.4dB between the SOVA and Log-MAP algorithms. |
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