WO2006002310B1 - Legacy compatible spatial multiplexing systems and methods - Google Patents

Legacy compatible spatial multiplexing systems and methods

Info

Publication number
WO2006002310B1
WO2006002310B1 PCT/US2005/022249 US2005022249W WO2006002310B1 WO 2006002310 B1 WO2006002310 B1 WO 2006002310B1 US 2005022249 W US2005022249 W US 2005022249W WO 2006002310 B1 WO2006002310 B1 WO 2006002310B1
Authority
WO
WIPO (PCT)
Prior art keywords
packet
cyclic
antenna
shifted
spatial multiplexing
Prior art date
Application number
PCT/US2005/022249
Other languages
French (fr)
Other versions
WO2006002310A3 (en
WO2006002310A2 (en
Inventor
Mark A Webster
Michael J Seals
Original Assignee
Conexant Systems Inc
Mark A Webster
Michael J Seals
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 Conexant Systems Inc, Mark A Webster, Michael J Seals filed Critical Conexant Systems Inc
Publication of WO2006002310A2 publication Critical patent/WO2006002310A2/en
Publication of WO2006002310A3 publication Critical patent/WO2006002310A3/en
Publication of WO2006002310B1 publication Critical patent/WO2006002310B1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • 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
    • H04B7/0615—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 of weighted versions of same signal
    • H04B7/0619—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 of weighted versions of same signal using feedback from receiving side
    • H04B7/0658—Feedback reduction
    • H04B7/066—Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
    • 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
    • H04B7/0697—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 spatial multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements

Abstract

Embodiments of legacy compatible spatial multiplexing systems and methods are disclosed. One method embodiment, among others, comprises receiving long training symbols (422a) and cyclic shifted long training symbols (524b) corresponding to legacy preamble portions of packets corresponding to first (401) and second transmit signals (501), receiving long training symbols (422a) and inverted cyclic shifted long training symbols corresponding to spatial multiplexing portions of packets corresponding to first and second transmit signals, and combining the symbols corresponding to the first and second transmit antennas to estimate the respective channels.

Claims

AMENDED CLAIMS received by the International Bureau on 06 June 2006 (06.06.06)
Therefore, having thus described the invention, at least the following is claimed:
21. A packet generation method, comprising: sending a first packet from a antenna, the first packet having a preamble portion and a data portion; and sending a second packet from a second antenna, the second packet having a cyclic-shifted preamble portion and a cyclic-shifted data portion.
22. A packet generation system, comprising: logic configured to send a first packet from a antenna, the first packet having a preamble portion and a data portion and send a second packet from a second antenna, the second packet having a cyclic-shifted preamble portion and a cyclic-shifted data portion.
23. A packet reception method, comprising: receiving a first packet from a first antenna, the first packet having a preamble portion and a data portion; and receiving a second packet from a second antenna, the second packet having a cyclic-shifted preamble portion and a cyclic-shifted data portion.
24. Thw method of claim 23, further comprising computing a cyclic shifted channel estimate corresponding to the second antenna.
25. A packet reception system, comprising: logic configured to receive a first packet from a first antenna, the first packet having a preamble portion and a data portion and receive a second packet from a second antenna, the second packet having a cyclic-shifted preamble portion and a cyclic-shifted data portion,
26. The system of claim 25, wherein the logic is configured to compute a cyclic shifted channel estimate corresponding to the second antenna.
36
PCT/US2005/022249 2004-06-22 2005-06-22 Legacy compatible spatial multiplexing systems and methods WO2006002310A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US58135804P 2004-06-22 2004-06-22
US60/581,358 2004-06-22

Publications (3)

Publication Number Publication Date
WO2006002310A2 WO2006002310A2 (en) 2006-01-05
WO2006002310A3 WO2006002310A3 (en) 2006-07-06
WO2006002310B1 true WO2006002310B1 (en) 2006-09-08

Family

ID=35782342

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2005/022249 WO2006002310A2 (en) 2004-06-22 2005-06-22 Legacy compatible spatial multiplexing systems and methods

Country Status (2)

Country Link
US (1) US7643453B2 (en)
WO (1) WO2006002310A2 (en)

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Also Published As

Publication number Publication date
WO2006002310A3 (en) 2006-07-06
US7643453B2 (en) 2010-01-05
US20050281241A1 (en) 2005-12-22
WO2006002310A2 (en) 2006-01-05

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