H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/18 (2006.01) H04L 1/00 (2006.01) H04M 11/06 (2006.01)
Patent
CA 2167741
In a modulator-demodulator device, there are provided, in the transmitter side; error control coding means for coding a signal to be transmitted in accordance with a predetermined transition rule for restricting the transition of signal points on the complex plane; modulation means for modulating the coded signal coded by the error control coding means to transmit the modulated signal to a communication networks first transmission signal selecting means for sending out at start of transmission of data, during a first predetermined length of time, a signal coded by the error control coding means; second transmission signal selecting means for sending out, at the time of terminating the sending out of a non-coded signal, during a second predetermined length of time, a signal coded by the error control coding means, and switching at the time of terminating the sending out of the signal coded by said error control coding means, to the sending out of the data. The receiver side of the device comprises: demodulation means for demodulating the modulated signal from the communication network to provide a received signal point on a complex plane; error control signal decoding means for setting an evaluation value for transition sequences of a plurality of the received signals based on the transition rule of the transmitter side, updating the evaluation value for each of the received signals, and selecting the transition sequence of the maximum likelihood received signal based on an updated evaluation value to correct the error in the demodulated signal point; and evaluation value setting means for designating to the error control signal decoding means the initial value of the evaluation value updated by the signal coded by the error control coding means, which is first received upon the switching from the transmission of the said non-coded signal to the transmission of the coded signal.
Kaku Takashi
Mizutani Yasunao
Fujitsu Limited
Mcfadden Fincham
LandOfFree
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