| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve receiving sensitivity regardless of sign inversion (polarity inversion) of the message data by detecting a parameter of a received signal with high sensitivity even in a condition in which message data can not be obtained in a spread spectrum signal receiver. <P>SOLUTION: The message data in the received signal is estimated, and each polarity corresponding to each message data in the received signal is changed in accordance with the sign inversion of the estimated message data to thereby eliminate frequency components of the message data in the received signal, a cut-off frequency is sufficiently lowered. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
