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題 名 | 以Radix-4為基礎之SOVA解碼演算法=Radix-4 SOVA Based Decoding Algorithm |
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作 者 | 洪偉文; 林義楠; | 書刊名 | 明志學報 |
卷 期 | 39:1 2007.06[民96.06] |
頁 次 | 頁69-75 |
分類號 | 312.3 |
關鍵詞 | 渦輪碼; 軟式輸出維特比演算法; SOVA; Turbo codes; Radix-4; |
語 文 | 中文(Chinese) |
中文摘要 | 渦輪碼在1993年被Berrou等人提出後,由於其優異的改錯能力,目前已被廣泛的應用到通訊系統中,如第三代行動通訊系統(3G)、太空通訊…等。渦輪碼之傳統(MAP)解碼器在複雜度及時間需求均較其他系統高,因此近來軟式輸出維特比演算法(SOVA)被提出來,它可以達到降低其系統複雜度及維持高解碼效益的好處。本論文提出一個改良式的SOVA演算法來進行解碼,使用Radix-4的結構來替代原本的Radix-2,利用此一架構的好處在於計算ML最佳的路徑時,可以節省大約一半的路徑存活所需記憶體的儲存空間及運算時之延遲時間。在節省所需之記憶體空間及解碼所耗費之延遲時間下,其相對的解碼效益在位元錯誤率(BER)為10¯⁴下,約只下降了0.4dB。 |
英文摘要 | The coding technique of turbo codes was proposed by Berrou et al., in 1993. Since its excellent performance, the channel coding has been widely used in error control for many communication applications, such as third-generation (3G) mobile radio systems and deep space communications. A conventional (MAP) turbo decoder requires much more decoding complexity and time consumption than those decoders of other coding scheme. Recently, the soft-output Viterbi algorithm (SOVA) for decoding a code has been introduced and applied to iterative turbo decoding system. Owing to the properties of low system complexity and high decoding speed, it has been recommended to decode the turbo code for a portable radio communication system. In conventional SOVA-based turbo decoder, it has been implemented with a radix-2 trellis. The throughputs of SOVA decoders have traditionally been limited by the implementation of the radix-2 structure due to a one step recursion that processes one bit per clock cycle. In this paper, we try to explore an architecture based on radix-4 trellis SOVA decoder. The simulation results show that the proposed architecture can achieve about halved time latency for somputing metrics and up to near twice times symbol throughput than that of radix-2 structure. In coding gain performance aspect, it has a slight degradation of coding gain about 0.4 dB than a conventional SOVA at 10¯⁴BER; nevertheless it is suitable to be applied to decode turbo codes for a mobile phone. |
本系統中英文摘要資訊取自各篇刊載內容。