Multiplex communications – Generalized orthogonal or special mathematical techniques – Plural diverse modulation techniques
Reexamination Certificate
2003-12-30
2008-11-11
Backer, Firmin (Department: 2616)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Plural diverse modulation techniques
C370S208000, C370S482000, C370S491000
Reexamination Certificate
active
07450489
ABSTRACT:
In a wireless local area network (WLAN) that includes high-throughput communication devices with multiple antennas and legacy communication devices with single antennas, training tones are transmitted over a plurality of spatial channels during a first portion of an orthogonal frequency division multiplexed (OFDM) packet-training preamble. The training tones are interspersed among subcarrier frequencies of the spatial channels. The training tones are retransmitted during a second portion of the packet-training preamble. The training tones are shifted among the subcarrier frequencies of the spatial channels during the retransmission allowing a high-throughput receiving station to perform a channel estimation on different subcarrier frequencies of the spatial channels. The legacy communication devices may receive and process the training tones and may set their network allocation vector to refrain from communicating during a subsequent interval.
REFERENCES:
patent: 2002/0041635 (2002-04-01), Ma et al.
patent: 2002/0110138 (2002-08-01), Schramm
patent: 2002/0122381 (2002-09-01), Wu et al.
patent: 2003/0072255 (2003-04-01), Ma et al.
patent: 2004/0004935 (2004-01-01), Zhu et al.
patent: 2005/0195734 (2005-09-01), Sandell et al.
patent: 2005/0259567 (2005-11-01), Webster et al.
patent: 2006/0227891 (2006-10-01), Niu et al.
patent: 2007/0291639 (2007-12-01), Jacobsen et al.
patent: 2008/0002568 (2008-01-01), Wu et al.
patent: 1170897 (2002-09-01), None
patent: 1494381 (2005-01-01), None
patent: WO-03/034644 (2003-04-01), None
patent: WO-03/085869 (2003-10-01), None
patent: WO-2005067247 (2005-07-01), None
“Oral Hearing—European Application No. 0481540.3”, (Feb. 13, 2008),12 pgs.
“International Search Report for corresponding PCT Application No. PCT/US2004/043324”, (May 19, 2005), 4 pgs.
Backer Firmin
Gorrie Gregory J.
Intel Corporation
Nguyen Phuongchau B
Schwegman Lunberg & Woessner, P.A.
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