Reception device and method

摘要

In a reception device and a reception method for a multivalue VSB, QPSK, or mutlivalue QAM modulated signal, reliability information (R) is generated (22) on the basis of estimation results for the received signal transmission channel, and Viterbi decoding is performed on the basis of the reliability information (R). It may be so arranged that the smaller the absolute value of the difference between the maximum gain and the minimum gain within the transmission frequency band of the output of a transmission channel estimation means (17) is, the higher the reliability indicated by the output reliability information will be. Error correction capabilities can be improved in various transmission channel environments, and errors in transmitted data recovered at the receiving end can be reduced.

主权项

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.