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1.发明公开DEVICE FOR ESTIMATING SOFT JUDGEMENT VALUE AND DEVICE FOR ESTIMATING MAXIMUM LIKELIHOOD SYSTEM. 失效DEVICE为了估计模拟决定值和最大似然系统。
公开(公告)号：EP0682414A4
公开(公告)日：1997-02-26
申请号：EP94909296
申请日：1994-03-10
发明人： ONO SHIGERU , HAYASHI HIROSHI , TANAKA TOMOKO , KONDOH NORIAKI
CPC分类号： H04L25/03318 , H03M13/23 , H03M13/39 , H03M13/41 , H03M13/6331
摘要： Metric calculating means calculates a first metric of a transmitted symbol sequence estimated by an adaptive equalizer. Then it calculates a second metric of a symbol sequence in which the polarity of a symbol in a position where the soft judgment value is to be determined in the transmitted symbol sequence is inverted. A subtraction unit (9) subtracts the second metric from the first metric. Thereafter, a multiplication unit (10) multiplies the result of the subtraction by the symbol in the position where the soft judgment value is to be determined in the transmitted symbol sequence, thus outputting the soft judgment value.
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2.发明公开ADAPTATIVE EQUALIZING RECEIVER AND MAXIMUM LIKELIHOOD SEQUENCE ESTIMATION RECEIVER. 失效自适应均衡器接收器和最大似然序列额定值接收机。
公开(公告)号：EP0615347A4
公开(公告)日：1999-06-02
申请号：EP93919666
申请日：1993-09-16
发明人： HAYASHI HIROSHI , ONO SHIGERU , KONDO NORIAKI
CPC分类号： H04L25/03057 , H04B7/005 , H04L25/0216 , H04L2025/03401 , H04L2025/0349 , H04L2025/03585
摘要： A receiver for compensating the deterioration of transmission characteristics, in which a transmission path estimation circuit (5) estimates the impulse response of the transmission path from the received signal. Bases upon the estimated impulse response, a switch (7) outputs selectively one of the outputs of an adaptative equalizing circuit (10) which adaptively equalize the received signal, and of a sign judging circuit (9) which is output only by judging the sign of the received signal. Then, a variable number-of-tap adaptive filter is used for the adaptive equalization of the received signal. Based on the estimated impulse response, the number-of-tap setting means controls the number of taps of the adaptive filter. Also, for the adaptive equalization of the received signal, there are used a transversal type matching filter, and a status estimation circuit which estimates the maximum likelihood of the transmission symbol string by the output from the matching filter. The number-of-tap setting means controls the number of statuses to be considered in accordance with the estimated impulse response.
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