Title:
METHODS AND APPARATUS FOR BACKWARDS COMPATIBLE COMMUNICATION IN A MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATION SYSTEM WITH LOWER ORDER RECEIVERS
Document Type and Number:
WIPO Patent Application WO2005006588
Kind Code:
A3
Abstract:
A method and apparatus are disclosed for transmitting symbols in a multiple antenna wireless communication system, such that the symbols can be interpreted by a lower order receiver (i.e., a receiver having a fewer number of antennas than the transmitter). For example, subcarriers from one or more symbols can be transmitted such that each of the subcarriers are active on only one of the antennas at a given time. In one implementation, the subcarriers are diagonally loaded across logically adjacent antennas. The symbols can include one or more long training symbols and optionally a SIGNAL field that indicates a duration that a receiver should defer until a subsequent transmission. In this manner, a transmitter in accordance with the present invention may be backwards compatible with a lower order receiver and a lower order receiver can interpret the transmitted symbols or defer for an appropriate duration.
Inventors:
BOER JAN H (NL)
DRIESEN BAS (NL)
SCHENK TIM (NL)
VAN ZELST ALLERT (NL)
DRIESEN BAS (NL)
SCHENK TIM (NL)
VAN ZELST ALLERT (NL)
Application Number:
PCT/US2004/021026
Publication Date:
May 19, 2005
Filing Date:
June 30, 2004
Export Citation:
Assignee:
AGERE SYSTEMS INC (US)
BOER JAN H (NL)
DRIESEN BAS (NL)
SCHENK TIM (NL)
VAN ZELST ALLERT (NL)
BOER JAN H (NL)
DRIESEN BAS (NL)
SCHENK TIM (NL)
VAN ZELST ALLERT (NL)
International Classes:
H04L1/06; H04J99/00; H04L27/26; H04L25/02; (IPC1-7): H04L27/26; H04L1/06
Other References:
MYEONGCHEOL SHIN ET AL: "A new training symbol structure to enhance the performance of channel estimation for mimo-ofdm systems", 2003 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH, AND SIGNAL PROCESSING. PROCEEDINGS. (ICASSP). HONG KONG, APRIL 6 - 10, 2003, IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH, AND SIGNAL PROCESSING (ICASSP), NEW YORK, NY : IEEE, US, vol. VOL. 1 OF 6, 6 April 2003 (2003-04-06), pages IV397 - IV400, XP010641180, ISBN: 0-7803-7663-3
SUMEI SUN; WIEMER I; HO C K; TJHUNG T T: "Training sequence assisted channel estimation for MIMO OFDM", WCNC 2003 - IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE, vol. 1, 16 March 2003 (2003-03-16), NEW ORLEANS, LA, USA, pages 38 - 43, XP002304707
SUMEI SUN; WIEMER I; HO C K; TJHUNG T T: "Training sequence assisted channel estimation for MIMO OFDM", WCNC 2003 - IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE, vol. 1, 16 March 2003 (2003-03-16), NEW ORLEANS, LA, USA, pages 38 - 43, XP002304707
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