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Maximum likelihood sequence distance calculation skillful device, device and decoding manner null for maximum likelihood sequence decoding
Maximum likelihood sequence distance calculation skillful device, device and decoding manner null for maximum likelihood sequence decoding
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机译:最大似然序列距离计算熟练的设备,装置和解码方式为最大似然序列解码为空
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摘要
PURPOSE: To provide a computer for maximum likelihood sequence distance used for a sequence decoder that processes a sequence of sampled value from a communication channel or a recorder. ;CONSTITUTION: The distance computer is used by a maximum likelihood decoder where a 2-state trelis is based on a sequence. This includes the duo binary, di-code or partial response class IV signal system. An alive distance with respect to two stages is proportional to a peak level detected by the state. Thus, the peak level is stored by a peak detector 14 till a level of an opposite polarity is detected and a trelis path is converted into an opposite polarity state. A threshold level to convert a path in a state depends on the peak level in the opposite polarity state and a maximum likelihood threshold level. Since only the peak level of a state is stored, an increase in an absolute value of a non- boundary distance is not a problem.;COPYRIGHT: (C)1993,JPO
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