Patent ID: 8811465
Filing Date: 2014-08-19
Classification: H03M,H04B,H04L

Abstract:
1. A reception device for receiving a transmitted signal modulated by convolutionally coded transmitted data, a given known signal being superimposed on the transmitted signal, and recovering the transmitted data from the received signal, comprising: a frequency conversion unit configured to convert the received signal to a signal in a given frequency band; a Fourier transform configured to perform a Fourier transform of the signal in the given frequency band and output a result; a frequency-axis equalization unit configured to receive the output of the Fourier transform unit and correct, in a frequency domain, distortion suffered in a transmission channel by the received signal, thereby performing equalization in the frequency domain; an inverse Fourier transform unit configured to perform an inverse Fourier transform on an output of the frequency-axis equalization unit and output an equalized signal in a time domain; a known signal generating unit configured to generate the known signal superimposed on the transmitted signal; a transmission channel estimation unit configured to estimate the transmission channel of the received signal and output a Fourier transform of coefficients representing a frequency characteristic of the transmission channel; a reliability information generating unit configured to generate, from variations in a transmission channel amplitude characteristic of the output of the transmission channel estimation unit in a transmission frequency band, reliability information representing reliability of the signal output from the inverse Fourier transform unit; and a Viterbi decoding unit configured to perform a Viterbi decoding process based on the output of the inverse Fourier transform unit and the reliability information to recover the transmitted data; wherein the frequency-axis equalization unit corrects the output of the Fourier transform unit on a basis of the output of the transmission channel estimation unit.