| 摘要 |
PROBLEM TO BE SOLVED: To estimate a signal by separately dealing with nonlinear distortion caused by Gaussian filtered minimum shift keying GMSK modulation and linear distortion caused by a multi-path of a transmission line. SOLUTION: A convolution computing element 105 applies convolution arithmetic operation to an output signal from an estimate signal storage device 104 and an output signal from a coefficient correction device 103. A branch metric computing element 101 obtains a branch metric on the basis of the Viterbi algorithm from a received signal and an output signal of the convolution computing element 105. A signal discrimination device 102 uses an output signal of the branch metric computing element 101 to estimate a signal on the basis of the Viterbi algorithm. The estimate result is outputted as a discrimination signal. A coefficient correction device 103 corrects linear distortion coefficient so that linear distortion included in the received signal can be coincident with the linear distortion coefficient by using the received signal and a discrimination signal, and then the corrected linear distortion coefficient is outputted to the convolution computing element 105. |
