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    • 4. 发明授权
    • Turbo decoder using binary LogMAP algorithm and method of implementing the same
    • Turbo解码器采用二进制LogMAP算法和实现方法相同
    • US06772389B2
    • 2004-08-03
    • US09966201
    • 2001-09-26
    • Hyuk KimIn-San JeonWoo-Seok YangKyung-Soo KimHan-Jin Cho
    • Hyuk KimIn-San JeonWoo-Seok YangKyung-Soo KimHan-Jin Cho
    • H03M1345
    • H03M13/3905H03M13/2957H03M13/3927H03M13/6502H03M13/6577
    • Disclosed are a turbo decoder, which applies a base-2 binary LogMAP algorithm in implementing a turbo decoder to thereby reduce the hardware requirement and implement a high-speed turbo decoder, which comprising a split for splitting the sum of two input state metrics into an integral and a decimal part; a comparator for comparing the integral parts of the two state metrics to extract a maximum and a minimum integer; a subtractor for obtaining a difference between the original integral part and the maximum or minimum integer value; a lookup table for calculating the sum of exponential terms of base-2 function in the decimal parts; a shifter for shifting only a decimal part with a smaller integral part by the difference; an adder for adding the decimal part and a decimal part with a larger integral part; a log pre-processing block for applying a base-2 logarithm on the decimal part to thereby obtain a final value for the decimal part; and an adder for adding the maximum integral value and the final value for the decimal part to thereby obtain a final value of the base-2 function.
    • 公开了一种turbo解码器,其在实现turbo解码器中应用基2二进制LogMAP算法,从而降低硬件要求并实现高速turbo解码器,该高速turbo解码器包括用于将两个输入状态度量的和分解为 积分和小数部分; 用于比较两个状态度量的积分部分以提取最大和最小整数的比较器; 用于获得原始积分部分与最大或最小整数值之间的差的减法器; 用于计算小数部分中base-2函数的指数项的和的查找表; 移位器,用于仅移动具有较小整数部分的小数部分的差值; 用于将小数部分和小数部分与较大整数部分相加的加法器; 用于在小数部分应用基2对数的日志预处理块,从而获得小数部分的最终值; 以及加法器,用于将最大积分值和小数部分的最终值相加,从而获得基2功能的最终值。