Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2004-10-26
2008-09-09
Nguyen, Chau T. (Department: 2619)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S334000, C370S338000, C455S101000
Reexamination Certificate
active
07423989
ABSTRACT:
A method for generating a preamble of a frame for a multiple input multiple output (MIMO) wireless communication begins by, for each transmit antenna of the MIMO wireless communication, generating a carrier detect field, wherein, from transmit antenna to transmit antenna, the carrier detect field is cyclically shifted. The method continues by, for a first grouping of the transmit antennas of the MIMO wireless communication: generating a first guard interval following the carrier detect field; and generating at least one channel sounding field, wherein, from transmit antenna to transmit antenna in the first grouping, the at least one channel sounding field is cyclically shifted, and wherein the at least one channel sounding field follows the first guard interval. The method continues by, when the MIMO wireless communication includes more than the first grouping of the transmit antennas, for another grouping of the transmit antennas: generating at least one other channel sounding field, wherein, from transmit antenna to transmit antenna in the another grouping, the at least one other channel sounding field is cyclically shifted, and wherein the at least one other channel sounding field follows the at least one channel sounding field; and generating the first guard interval prior to the at least one other channel sounding field.
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Fischer Matthew J.
Hansen Christopher J.
Moorti R. Tushar
Trachewsky Jason A.
Young Christopher
Broadcom Corporation
Chriss Andrew
Garlick & Harrison & Markison
Markison Timothy W.
Nguyen Chau T.
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