[54] SPREAD SPECTRUM COMMUNICATION SYSTEM
[75] Inventor: Masayasu Miyake, Tokyo, Japan
[73] Assignee: Casio Computer Co., Ltd., Tokyo, Japan
[21] Appl. No.: 266,235
[22] Filed: Jim. 27,1994
[30] Foreign Application Priority Data
Jun. 30, 1993 [IP] Japan 5-160741
[51] Int. CI.6 H04B 1/707; H04B 1/69
[52] U.S. CI 375/206; 375/200; 380/34
[58] Field of Search 375/1, 200-210;
380/34; 370/18
[56] References Cited
U.S. PATENT DOCUMENTS
3,808,536 4/1974 Reynolds 375/1 X
4,308,617 12/1981 German, Jr. 375/1
4,392,220 7/1983 Hirosaki et al 370/18
4,470,138 9/1984 Gutleber 370/18
4.475.214 10/1984 Gutleber 370/18 X
4.475.215 10/1984 Gutleber 370/18 X
4,494,238 1/1985 Groth, Jr. 375/1
4,759,034 7/1988 Nagazumi 375/1
5,093,840 3/1992 Schilling 375/1
5,103,459 4/1992 Gilhousen et al 375/1
5,218,619 6/1993 Dent 375/1
5,291,515 3/1994 Uchida et al 375/1
5,309,474 5/1994 Gilhousen et al 375/1
FOREIGN PATENT DOCUMENTS
0219085 10/1986 European Pat. Off. H04Q 11/00
WO92/00639 1/1992 WIPO H04L 27/30
OTHER PUBLICATIONS
Patent Abstracts of Japan, vol. 15, No. 161 (E-1060), Apr. 23, 1991 & JP-A-30 032241 (Mitsubishi Electric Corp.), Feb. 12, 1991.
Primary Examiner—Bernarr E. Gregory
Attorney, Agent, or Firm—Frishauf, Holtz, Goodman,
Langer & Chick
[57] ABSTRACT
A spreading process is performed with a spreading code assigned to each user and a spreading code assigned according to an attribute, and the resultant signal is modulated on the transmitter side. On the receiver side, a transmitted signal, modulated in the above manner, is subjected to a despreading process with the attribute-oriented spreading code from a reception spreading code generator, the resultant signal is subjected to despreading process with the user-specific spreading code from the reception spreading code generator, and those signals which have undergone the despreading processes are demodulated by data demodulators to extract desired information together with a desired signal corresponding to a wide band service. It is therefore possible to simplify the management of the individual users and individual services and facilitate the system design.
27 Claims, 9 Drawing Sheets
