| 摘要 |
<p>PURPOSE:To perform the look-ahead of the internal state of a PN code generation shift register for spreading signal with little calculation amount to take the synchronization of a base station and a moving machine. CONSTITUTION:A 1-bit X n word memory 301 storing the internal states X1 to Xn of a shift register, an n-bit X n word memory 302 storing calculated matrix HM, an n-bit X1 word memory 303 storing the internal states A1 to An of a shift register after prescribed time to be the result of matrix operation and an exclusive OR calculation part 306 are provided, the contents of the n-bit X1 word memory 303 is cleared, 1 and 0 are investigated in order from the contents of the first address of the 1-bit x n word memory, the exclusive OR of the contents of the memory 302 at the address location and the contents of the memory 303 is performed in the calculation part 306 in the case of 1, the result is stored in the memory 303, the processing is repeated n times and the internal state of a shift register for generation of PN code after the time which a base station and a moving machine determines is obtained.</p> |
