| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve signal quality without the accompaniment of an increase in a bit rate in a DPSK (Differential Phase-Shift Keying) and DQPSK (Differential Quadrature Phase-Shift Keying) receiver. <P>SOLUTION: One of a received digital data signal is distributed (1), one of distributed (1) two digital data signals is identified and reproduced (2) with an identification threshold higher (or lower) than a predetermined reference value, the other of the two digital data signals is identified and reproduced (2) with an identification threshold lower (or higher) than a predetermined reference value, the reproduced (1) digital data signal is distributed (2), either a distributed (2) output or the reproduced (2) digital data signal is selected, the other of the received digital data signal is identified and reproduced (3) with the same identification threshold as that of reproduction (2), the distributed (2) digital data signal is selected when the distributed (2) output is compared with the reproduced (3) digital data signal to find that logic is not coincidental, and the reproduced (2) digital data signal is selected when the logic is coincidental. <P>COPYRIGHT: (C)2008,JPO&INPIT |
