Patent ID: 7466780
Filing Date: 2008-12-16
Classification: G06F,H04B,H04J

Abstract:
1. A filter unit for filtering a prescribed real impulse constant r satisfying 2−√3−0.1≦r≦2−√3+0.1, the filter unit comprising: an input terminal that accepts input of a Chebyshev chaos-type spreading code sequence X a delay section that includes (N−1) series-connected delay circuits for delaying by the chip length D of the spreading code sequence X an amplifying section that includes N series-connected amplifiers for amplifying the delayed signals output from the delay circuits by amplification factors (−r) an adder section that sums the amplified signals output from the N amplifiers and outputs the resulting sum signal; and an output terminal that outputs the sum signal as a signal of an optimal chaotic spreading sequence.