SPREAD CODE ASSIGNING METHOD IN CODE SPREAD RADIO COMMUNICATION USING A PLURALITY OF TRANSMISSION/RECEPTION ANTENNAS AND CODE SPREAD RADIO COMMUNICATION SYSTEM USING THE SAME

Title:

SPREAD CODE ASSIGNING METHOD IN CODE SPREAD RADIO COMMUNICATION USING A PLURALITY OF TRANSMISSION/RECEPTION ANTENNAS AND CODE SPREAD RADIO COMMUNICATION SYSTEM USING THE SAME

Document Type and Number:

WIPO Patent Application WO/2005/002104

Kind Code:

A1

Abstract:

A receiver (102) connected to a plurality of reception antennas (121, 122) includes a propagation path correlation estimation circuit (108). The propagation path correlation estimation circuit calculates a correlation value of each propagation path between each of transmission antennas (111, 112) and each of the reception antennas and transmits the calculation result as propagation path correlation information (S_COR). A transmitter (101) connected to a plurality of transmission antennas includes a spread code assigning circuit (106). According to the propagation path correlation information, the spread code assigning circuit assigns only spread codes orthogonal to each other for the transmission antenna corresponding to a correlation value exceeding a threshold value and, for a transmission antenna having no propagation path of a correlation value exceeding the threshold value, assigns a spread code without considering orthogonality to a spread code in the other transmission antenna.

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Inventors:

KAKURA YOSHIKAZU (JP)

Application Number:

PCT/JP2004/009603

Publication Date:

January 06, 2005

Filing Date:

June 30, 2004

Export Citation:

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Assignee:

NEC CORP (JP)
KAKURA YOSHIKAZU (JP)

International Classes:

H04B7/04; H04J99/00; H04B7/06; H04J13/00; H04J13/18; H04W16/28; H04W72/04; H04W76/00; H04W76/02; H04J11/00; (IPC1-7): H04J15/00

Foreign References:

JP2004166038A	2004-06-10
JP2004222241A	2004-08-05
JPH11298369A	1999-10-29
JPH10145282A	1998-05-29

Other References:

MUDULODU S. ET AL.: "A simple multiplexing scheme for MIMO systems using multiple spreading codes", CONFERENCE RECORD OF THE THIRTY-FOURTH ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS AND COMPUTERS, vol. 1, 2000, pages 769 - 774, XP010535467

Attorney, Agent or Firm:

Ikeda, Noriyasu (Nishishinbashi 1-chome Minato-ku, Tokyo, JP)

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