公开(公告)号：KR1020020096618A

公开(公告)日：2002-12-31

申请号：KR1020010035308

申请日：2001-06-21

Applicant: 한국전자통신연구원

Inventor： 김건 ,  김덕현 ,  이수인 ,  정영호 ,  박소라 ,  이현

IPC: H03M13/23

CPC classification number: H03M13/4107 ,  H03M13/6502

Abstract: PURPOSE: An add-compare-select(ACS) and trellis-coded-modulation decoder using the acs are provided to prevent an overflow phenomenon due to cumulation of path metric values and estimate a channel state and a bit error rate by using the normalization function and the error monitoring function. CONSTITUTION: An adder(122) adds a cumulative path metric value of a current state to a branch metric value. A minimum value table(121) is used for storing a cumulative path metric minimum value. A subtracter(123) is used for subtracting an output value of the minimum value table(121) from an output value of the adder(122). A selector(124) selects one from an output value of the subtracter(123) and the output value of the adder(122). A comparator(125) is used for comparing a selected value of the selector(124) with a cumulative path metric value of the next state of the second survival path metric memory portion. A selector(126) outputs the selected value of the selector(124) and a smaller value of the cumulative path metric values of the next state to the cumulative path metric value of the next state.

Abstract translation: 目的：提供使用acs的加法比较选择（ACS）和网格编码调制解码器，以防止由于路径度量值的累积引起的溢出现象，并通过使用归一化函数来估计信道状态和误码率 和错误监控功能。 构成：加法器（122）将当前状态的累积路径量度值与分支量度值相加。 最小值表（121）用于存储累积路径度量最小值。 减法器（123）用于从加法器（122）的输出值中减去最小值表（121）的输出值。 选择器（124）从减法器（123）的输出值和加法器（122）的输出值中选择一个。 比较器（125）用于将选择器（124）的选定值与第二存活路径度量存储器部分的下一状态的累积路径量度值进行比较。 选择器（126）将选择器（124）的选择值和下一状态的累积路径度量值的较小值输出到下一状态的累积路径量度值。