FILTER APPARATUS, RECEPTION APPARATUS, TRANSMISSION APPARATUS, DIFFUSION MODULATION APPARATUS, PSEUDO-RANDOM NUMBER SEQUENCE OUTPUT APPARATUS, FILTER METHOD, RECEPTION METHOD, TRANSMISSION METHOD, DIFFUSION MODULATION METHOD, PSEUDO-RANDOM NUMBER SEQUENCE OUTPUT METHOD, AND PROGRAM

摘要

A filter (201) accepts spreading code sequences or the like as input sequences of a chip rate 1/D, the accepted spreading code sequences are sequentially delayed and distributed by delay circuits (202) connected in series, delay times of individual signals are an arithmetical progression with a chip length D being a common difference D, the individual signals are amplified with spreading codes by amplifiers (203), amplification factors for the individual signals are a geometrical progression of a common ratio r, the sum of the amplified signals is obtained by addition in an adder (204), and the result is sequentially output as an output sequence. <IMAGE>