| 摘要 |
An FIR filter for filtering a prescribed real impulse constant (r) (-1<r<1) receives in a terminal the input of the input signal of the Chebyshev-chaos type spreading code sequence having a chip length D. A plurality of signals obtained by delaying the input signals by 0, D, 2D, 3D, . . . , and (N-1)D are output by a delay circuit. When the delay time is T, a plurality of delayed and output signals are multiplied by (-r)N-T/D with an amplifier and output, and the sum of a plurality of amplified and output signals, namely an optimum chaos-type spreading code string, is output by an adder.
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