Title:
IMPROVED MULTI-LEVEL SEQUENCES FOR CDMA DATA COMMUNICATION
Document Type and Number:
WIPO Patent Application WO2001056173
Kind Code:
A3
Abstract:
A method and apparatus for data communication in a variety of communication systems using spread spectrum techniques and multilevel sequences in which distinct multilevel sequences used contain binary subsequences that interfere constructively such that synchronous cross-correlation values add constructively. By adding two subsequences from different sets it is ensured that neither subsequence belongs to the same set this in combination with use of correlators reducing complexity, and facilitates increasing the order of a modulation scheme thus enhancing the bandwidth efficiency.
Inventors:
O'FARRELL TIMOTHY (GB)
Application Number:
PCT/EP2001/001016
Publication Date:
January 24, 2002
Filing Date:
January 25, 2001
Export Citation:
Assignee:
SUPERGOLD COMM LTD (CY)
FARRELL TIMOTHY O (GB)
FARRELL TIMOTHY O (GB)
International Classes:
H04B1/707; H04J13/00; H04J13/10; (IPC1-7): H04B1/707; H04J13/00
Other References:
SUEHIRO N ET AL: "Binary signal design for approximately synchronized CDMA systems without detection sidelobe nor co-channel interference using auto- and cross-complementary codes", ICUPC '98. IEEE 1998 INTERNATIONAL CONFERENCE ON UNIVERSAL PERSONAL COMMUNICATIONS. CONFERENCE PROCEEDINGS (CAT. NO.98TH8384), ICUPC '98. IEEE 1998 INTERNATIONAL CONFERENCE ON UNIVERSAL PERSONAL COMMUNICATIONS. CONFERENCE PROCEEDINGS, FLORENCE, ITALY, 1998, New York, NY, USA, IEEE, USA, pages 1097 - 1102 vol.2, XP002173807, ISBN: 0-7803-5106-1
SUEHIRO NAOKI: "New signal design method by coded addition of sequences", PROCEEDINGS OF THE 1995 IEEE INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY;WHISTLER, BC, CAN SEP 17-22 1995, 1995, IEEE Int Symp Inf Theor Proc;IEEE International Symposium on Information Theory - Proceedings 1995 IEEE, Piscataway, NJ, USA, pages 91, XP002173808
DAS J: "A TECHNIQUE FOR IMPROVING THE EFFICIENCY OF M-ARY SIGNALING", IEEE TRANSACTIONS ON COMMUNICATIONS,US,IEEE INC. NEW YORK, vol. COM-32, no. 2, 1 February 1984 (1984-02-01), pages 199 - 201, XP002072640, ISSN: 0090-6778
ENGE P K ET AL: "SPREAD-SPECTRUM MULTIPLE-ACCESS PERFORMANCE OF ORTHOGONAL CODES: LINEAR RECEIVERS", IEEE TRANSACTIONS ON COMMUNICATIONS,IEEE INC. NEW YORK,US, vol. COM-35, no. 12, 1 December 1987 (1987-12-01), pages 1309 - 1319, XP000560639, ISSN: 0090-6778
SUEHIRO NAOKI: "New signal design method by coded addition of sequences", PROCEEDINGS OF THE 1995 IEEE INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY;WHISTLER, BC, CAN SEP 17-22 1995, 1995, IEEE Int Symp Inf Theor Proc;IEEE International Symposium on Information Theory - Proceedings 1995 IEEE, Piscataway, NJ, USA, pages 91, XP002173808
DAS J: "A TECHNIQUE FOR IMPROVING THE EFFICIENCY OF M-ARY SIGNALING", IEEE TRANSACTIONS ON COMMUNICATIONS,US,IEEE INC. NEW YORK, vol. COM-32, no. 2, 1 February 1984 (1984-02-01), pages 199 - 201, XP002072640, ISSN: 0090-6778
ENGE P K ET AL: "SPREAD-SPECTRUM MULTIPLE-ACCESS PERFORMANCE OF ORTHOGONAL CODES: LINEAR RECEIVERS", IEEE TRANSACTIONS ON COMMUNICATIONS,IEEE INC. NEW YORK,US, vol. COM-35, no. 12, 1 December 1987 (1987-12-01), pages 1309 - 1319, XP000560639, ISSN: 0090-6778
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