聯(lián)合判決估計(jì)在軟判決Viterbi譯碼中的應(yīng)用
United-Decision Estimating Used in Soft-Decision Viterbi Decoding
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摘要: 該文利用相鄰判決數(shù)據(jù)間的相互關(guān)系，提出了一種Viterbi截尾譯碼的改進(jìn)算法，并將其應(yīng)用到Turbo碼的SOVA譯碼中。仿真表明,可以很好地降低復(fù)雜性和功耗。對(duì)Viterbi譯碼，可使留選存儲(chǔ)的規(guī)模和功耗減少約20％，回溯單元的規(guī)模和功耗減少約30％。對(duì)Turbo碼的SOVA譯碼，可使可靠值存儲(chǔ)和輸出單元的規(guī)模和功耗降低約15％，或迭代次數(shù)減少一半。Abstract: By using the relation of neighboring data, an improved Viterbi algorithm is proposed and extended it to SOVA decoding of Turbo code in this paper. Simulation results show that, the improved algorithm has reduced-implementation-complexity and lower power consumption. With the proposed algorithm, it is achieved that reduction of 20% in the size and power consumption of survivor memory and reduction of 30% in the size and power consumption of trace back unit in Viterbi decoding. Furthermore, the improvement can achieve reduction of about 15% in the size and power consumption of reliability metric memory and output unit or save half iterations in soft-decision output Viterbi algorithm of Turbo code.
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Viterbi A J. Error bounds for convolutional codes and an asymptotically optimum decoding algorithm. IEEE Trans. on Information Theory, 1967, IT-13(2): 260-269. ［2］Berrou Claude, Glavieux Alain, Thitimajshima Punya. Near Shannon limit error-correcting coding and decoding: Turbo-codes. ICC93, Geneva, 1993, vol.2: 1064-1070. ［3］3rd Generation Partnership Project. Technical specification group radio access network multiplexing and channel coding. (TS 25.212 version 3.0.0). http:∥www.3gpp.org. ［4］Hagenauer Joachim, Hoeher Peter. A Viterbi algorithm with soft-decision outputs and its applications. Global Telecommunications Conference, and Exhibition Communications Technology for the 1990s and Beyond, 1989: 1680-1686. ［5］王新梅,肖國(guó)鎮(zhèn).糾錯(cuò)碼原理與方法.西安:西安電子科技大學(xué)出版社,1996:497. -
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