METHOD AND DEVICE FOR MODULATING POSITION OF SPREAD SPECTRUM CODE PULSE

Japanese Patent JP3778969

B2

PROBLEM TO BE SOLVED: To provide a means which modulates and demodulates communication signals for which spread spectrum is desirable.
SOLUTION: Spread code generators 420 and 440 receive an appropriate delay value, either Ipos or Qpos, from an encoder 10 and generates spread spectrum words with respect to the center of a spread symbol period. A transmission spectrum is spread by coding at least one bit with the spread code words. When received code words pass through a filter having a characteristic matching that of the words, their peaks are detected in main lobes and the positive and negative main lobes respectively indicate binary '0' and '1'. Additional information is carried by modulating the center position of the code words in the symbol period. The center position of the code words is changed in eight positions and eight signal states can be utilized, and then, three additional bits are carried. A modulator 455 respectively modulates two different independent time shift spread spectrum code words with orthogonal carrier signals and a total of eight bits is carried in each symbol period.

JP2000004264	S/N ESTIMATING CIRCUIT AND RECEPTION EQUIPMENT
JP2001189711	DEVICE AND METHOD FOR DISPLAYING CODE DOMAIN POWER
WO/1995/008241	APPARATUS FOR AND METHOD OF SPEECH DIGITIZING

Israel Bar-David

JP22123595A

May 24, 2006

August 30, 1995

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AT&T CORP.

H04L27/18; H04B1/69; H04B1/707; H04B14/02; (IPC1-7): H04B1/707; H04L27/18

JP6104862A
JP669908A
JP669905A
JP5252141A

Masao Okabe
Nobuaki Kato
Kazuo
Shinichi Usui
Ikuo Fujino
Takao Ochi
Teruhisa Motomiya
Norimichi Takanashi
Asahi Shinmitsu
Seiichiro Takahashi
Koji Yoshizawa

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