Patent ID: 6310887
Filing Date: 2001-10-30
Classification: H04L

Abstract:
A transmission speed predicting apparatus for selecting one transmission processing speed of digital data from a plurality of transmission processing speeds having a relation of a predetermined ratio, for convolution-coding the digital data, and producing repeated data by repeating each bit data of the convolution-coded data a number of times based on a ratio of the selected transmission processing speed to a maximum transmission processing speed among the plurality of transmission processing speeds, and for predicting a transmission processing speed of transmission data from received data obtained by receiving the transmission data including the digital data and the repeated data, said transmission speed predicting apparatus comprising:receiving means for producing first decision data including polarity data of each bit of the received data by processing the received data;storing means for storing the first decision data supplied from said receiving means;first incoincident number detecting means for reading the first decision data from said storing means at each of the plurality of transmission processing speeds and comparing polarity data corresponding to each bit data of the digital data in the received data with polarity data corresponding to the repeated data based on each bit data and detecting a first incoincident number using a result of the comparison, and for selecting a most likely polarity data from the polarity data corresponding to each bit data of the digital data and the polarity data corresponding to the repeated data and producing second decision data using the selected most likely polarity data;most likelihood value detecting means for Viterbi-decoding the second decision data for each of the plurality of transmission processing speeds so as to produce decoded data, and for detecting a most likelihood pathmetric value;second incoincident number detecting means, including convolution-coding means for producing convolution-coded data by convolution-coding the decoded data, for comparing corresponding polarity data of the coded data supplied by said convolution-coding means with polarity data of the second decision data for each of the plurality of transmission processing speeds, and detecting a second incoincident number using a result of the comparison; andtransfer speed selecting means for selecting the transmission processing speed of the transmission data corresponding to the received data based upon the first incoincident number, the most likelihood pathmetric value, and the second incoincident number.