TRANSMISSION SYMBOL FORMING CIRCUIT, DIGITAL DATA TRANSMITTER, TRANSMISSION SYMBOL FORMING METHOD, DIGITAL DATA TRANSMISSION METHOD, TRANSMISSION SYMBOL FORMING PROGRAM, MAXIMUM-LIKELIHOOD SEQUENCE ESTIMATION CIRCUIT, DIGITAL DATA RECEIVER, MAXIMUM-LIKELIHOOD SEQUENCE ESTIMATION METHOD, DIGITAL DATA RECEIVING METHOD, MAXIMUM-LIKELIHOOD SEQUENCE ESTIMATION PROGRAM, COMPUTER READABLE RECORDING MEDIUM, AND DIGITAL DATA TRANSCEIVER SYSTEM

摘要

PROBLEM TO BE SOLVED: To prevent inter-symbol interference and carry out maximum-likelihood sequence estimation effectively while an effective communication path is shortened without causing the complication of the constitution of a receiver and the deterioration of BER characteristics.;SOLUTION: In a transmission symbol forming unit 2, a time for transmitting no symbol is set in a communication frame, in which a plurality of symbols for indicating digital data are sequentially formed, to form a transmission symbol sequence for carrying out digital data communication. A Viterbi algorithm implementation unit 9 includes a likelihood calculation unit 10 for calculating a likelihood used in the Viterbi algorithm based on a time interval in which each symbol is transmitted sequentially in a symbol sequence {u (t)} formed by the transmission symbol forming unit 2 and the time interval in which the symbol is not transmitted within the transmission frame.;COPYRIGHT: (C)2006,JPO&NCIPI