| 摘要 |
PROBLEM TO BE SOLVED: To be adapted even in the case that a signal-to-noise ratio in a receiver declines by generating the required multiple of correlation between a code and a generated code during a required code cycle remaining before the end of a required cycle by a peak detection means. SOLUTION: This receiver is provided with an antenna 21, a base band converter 22 and a synchronization device 23. Further, the synchronization device 23 is provided with an orthogonal code generator 24 for generating the required number of codes provided with a required phase and a correlation means 26 related to the peak detection means 28. Then, the peak detection means 28 generates the product of the correlation between the code and the required pieces of the generated codes so as to decide the code during the required code cycle remaining before the end of the cycle. Also, all messages encoded by an orthogonal pair code are added together so as to form synthetic signals transmitted by the same frequency band. Thus, a transmitter and the receiver use the same spreading code. |
