Comb-form spectrum communication systems using repeated...

Multiplex communications – Generalized orthogonal or special mathematical techniques – Plural diverse modulation techniques

Reexamination Certificate

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C370S208000

Reexamination Certificate

active

06954422

ABSTRACT:
In comb-form spectrum communication systems using repeated complementary sequence modulation, a transmitting signal is constituted by assigning one set of N auto-complementary sequences to each user, where N is an integer equal to or higher than 2, and by transforming the N sequences to N repeated signals which have comb-form spectra without overlapping in frequency with one another with a method of repeating each sequence of the set of auto-complementary sequences a plurality of times, and by assigning the N complementary sequences with auto-complementary sequence characteristics to the N comb-form spectra. Thus, the near-far problem is solved by making the cross-correlation between a signal input to a user's station but addressed to another station and the user's reference code sequence, zero.

REFERENCES:
patent: 4047121 (1977-09-01), Campbell
patent: 5365361 (1994-11-01), Noll et al.
patent: 6421367 (2002-07-01), Kuroyanagi et al.
patent: 6588950 (2003-07-01), Pfeiffer
patent: H6-318927 (1994-11-01), None
Naoki Suehiro and Noriyoshi Kuroyanagi “Multipath-Tolerant Binary Signal Design for Approximately Synchronized CDMA Systems Without Co-Channel Interference Using Complete Complementary Codes” Mar. 19, 1998, pp.: 43-48.

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