| 摘要 |
PROBLEM TO BE SOLVED: To easily generate many codes by generating plural codes from analog signals obtained through repeating specific mapping to vary an initial value of the repetitive mapping. SOLUTION: A channel code is switched at a time interval of k, k+1, k+2,... and a value Xk of an analog signal at a time (k) is a code representing one channel. Which channel the code represents is decided by rounding the value Xk . In the case of an FH communication, it is handled that the value Xk represents 6 channels and the frequencies prepared corresponding to 6 channels are used for local oscillation frequencies at a transmitter side and a receiver side. The analog signal is converted into a discrete value and each discrete value is used for a code representing the channel, then many codes caused at random without periodicity are obtained. Since the channel is decided by rounding the discrete value, the receiver side conducts similar rounding. |
