| 摘要 |
PROBLEM TO BE SOLVED: To reduce a bit error rate by reducing combination error of a primary demodulator and an inversely spread signal by multiplying a specific primary modulation signal without fail with a specific spread code when the specific spread code is selected. SOLUTION: Spread series of r-sets selected by a spread series selection section 22 corresponds to r-sets of primary modulation signals to be multiplied. In the case of selection of PN1 , PN2 , PN3 , they are respectively outputted to modulation sections 231, 232, 233 without fail. Furthermore, in the case of selection of a PN4 without selection of the PN1 , the PN4 is outputted to the modulation section 321 without fail, in the case of selection of a PN5 without selection of the PN2 , the PN4 is outputted to the modulation section 321 without fail, and in the case of selection of a PN6 without selection of the PN3 , the PN4 is outputted to the modulation section 321 without fail. When an error in reception series selection by a reception series selection section 26 is one series, a mean error of the correspondence between a modulation section and a demodulation section is 1.48 and the number of combinations of errors of three series is 6 ways. Thus, a bit error rate is reduced by reducing the error of the correspondence between a modulation section and a demodulation section. |
