CA2109789A1 - Diversity for Direct-Sequence Spread Spectrum Systems - Google Patents

Diversity for Direct-Sequence Spread Spectrum Systems

Info

Publication number
CA2109789A1
CA2109789A1 CA2109789A CA2109789A CA2109789A1 CA 2109789 A1 CA2109789 A1 CA 2109789A1 CA 2109789 A CA2109789 A CA 2109789A CA 2109789 A CA2109789 A CA 2109789A CA 2109789 A1 CA2109789 A1 CA 2109789A1
Authority
CA
Canada
Prior art keywords
signal
segment
sub
segments
distinct
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2109789A
Other languages
French (fr)
Other versions
CA2109789C (en
Inventor
Vijitha Weerackody
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Publication of CA2109789A1 publication Critical patent/CA2109789A1/en
Application granted granted Critical
Publication of CA2109789C publication Critical patent/CA2109789C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission

Abstract

An invention for providing diversity for direct sequence spread spectrum wireless communication systems is presented. The invention provides a transmitting technique for communicating a first signal comprising one or more segments to a receiver with use of a plurality of M antennas. The first signal includes one or more signal segments. The technique comprises forming M copies of the first signal; for a segment of a signal copy, weighting each of two or more sub-segments of the segment with a distinct signal, wherein a sequence of the distinct weighting signals for the segment is distinct from sequences of signalsweighting the same segment of one or more other signal copies; and for each of Mweighted signal copies, transmitting a signal to the receiver using a distinct antenna, the transmitted signal based on the weighted signal copy. Illustratively, the first signal is a spread spectrum signal. Moreover, the process of weighting comprisesapplying a phase shift to a sub-segment. The invention further provides a receiving technique which comprises, for a copy of a received signal, despreading a segment of the received signal, demodulating a plurality of sub-segments of the despreadsignal segment, wherein each sub-segment is demodulated with use of one or more estimated communication channel characteristics corresponding to the sub-segment, and forming a summation signal reflecting a summation of a plurality of demodulated sub-segments. The receiving technique further comprises forming a signal reflecting a signal segment value, the formed signal based on one or moresummation signals. The step of demodulating may precede the step of despreading in some embodiments.
CA002109789A 1992-12-29 1993-11-23 Diversity for direct-sequence spread spectrum systems Expired - Lifetime CA2109789C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/998,229 US5289499A (en) 1992-12-29 1992-12-29 Diversity for direct-sequence spread spectrum systems
US998,229 1992-12-29

Publications (2)

Publication Number Publication Date
CA2109789A1 true CA2109789A1 (en) 1994-06-30
CA2109789C CA2109789C (en) 1997-09-23

Family

ID=25544947

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002109789A Expired - Lifetime CA2109789C (en) 1992-12-29 1993-11-23 Diversity for direct-sequence spread spectrum systems

Country Status (6)

Country Link
US (2) US5289499A (en)
EP (1) EP0605119B1 (en)
JP (1) JP2780918B2 (en)
CA (1) CA2109789C (en)
DE (1) DE69330865T2 (en)
ES (1) ES2161706T3 (en)

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Also Published As

Publication number Publication date
US5289499A (en) 1994-02-22
ES2161706T3 (en) 2001-12-16
JP2780918B2 (en) 1998-07-30
EP0605119A2 (en) 1994-07-06
JPH06303214A (en) 1994-10-28
DE69330865T2 (en) 2002-04-25
EP0605119A3 (en) 1995-05-10
EP0605119B1 (en) 2001-10-04
DE69330865D1 (en) 2001-11-08
US5394435A (en) 1995-02-28
CA2109789C (en) 1997-09-23

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