US 8,284,651 B2 · Preamble formats for MIMO wireless communications

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, generating a carrier detect field. The method continues by, for a first grouping of the transmit antennas, generating a first guard interval following the carrier detect field; and generating at least one channel sounding field. Continuing, the method applies cyclical shift prior to transmission via the first grouping of the transmit antennas. When the MIMO wireless communication includes more than the first grouping of the transmit antennas, for another grouping of the transmit antennas. For the another grouping of the transmit antennas, generating at least one other channel sounding field. The method proceeds by generating the first guard interval prior to the at least one other channel sounding field, and applying another cyclical shift prior to transmission via the another grouping of the transmit antennas.

Claims20

Dependent claims

A method for generating a preamble of a frame for a multiple input multiple output (MIMO) wireless communication, the method comprises:

for each transmit antenna of the MIMO wireless communication, generating a carrier detect field, wherein,
for a first grouping of the transmit antennas of the MIMO wireless communication:
generating a first guard interval following the carrier detect field;
generating at least one channel sounding field with respect to each transmit antennas of the first grouping, wherein the at least one channel sounding field follows the first guard interval;
and
for each transmit antenna of the first grouping, applying a cyclic shift to the at least one channel sounding field prior to transmission;
and
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 for each transmit antenna of the another grouping, wherein, from transmit antenna to transmit antenna in the another grouping, 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;
and
for each transmit antenna of the another grouping, applying another cyclic shift to the at least one other channel sounding field prior to transmission of the another grouping.

10 more elements

A method for generating a legacy compatible preamble of a frame for a multiple input multiple output (MIMO) wireless communication, the method comprises:

for each transmit antenna of a plurality of transmit antennas for the MIMO wireless communication, generating a carrier detect field, wherein,
for a first transmit antenna of the plurality of transmit antennas:
generating a first guard interval following the carrier detect field;
generating a first channel sounding field following the first guard interval;
generating a second channel sounding field following the first channel sounding field;
and
for each transmit antenna of a first grouping of remaining transmit antennas of the plurality of transmit antennas:
generating a third channel sounding field;
generating a fourth channel sounding field following the third channel sounding field;
generating a second guard interval preceding the third channel sounding field;
and
applying a cyclic shift to the carrier detect field prior to transmission via the each transmit antenna of the first transmit antenna and of the first grouping of the remaining transmit antennas.

9 more elements

A radio frequency (RF) transmitter comprises:

a baseband processing module configured to produce outbound symbol streams from outbound data;
and
a transmitter section configured to produce outbound RF signals from the outbound symbol streams, wherein the baseband processing module is operable to:
for each transmit antenna of the transmitter section, generate a carrier detect field, wherein, from transmit antenna to transmit antenna for a first grouping of the transmit antennas of the transmitter section:
generate a first guard interval following the carrier detect field;
generate at least one channel sounding field, wherein, from transmit antenna to transmit antenna in the first grouping, wherein the at least one channel sounding field follows the first guard interval;
and
for each transmit antenna of the first grouping, applying a cyclic shift to the carrier detect field prior to transmission;
and
when the transmitter section includes more than the first grouping of the transmit antennas, for another grouping of the transmit antennas:
generate at least one other channel sounding field, wherein, from transmit antenna to transmit antenna in the another grouping, wherein the at least one other channel sounding field follows the at least one channel sounding field;
and
generate the first guard interval prior to the at least one other channel sounding field;
and
for each transmit antenna of the another grouping, applying another cyclic shift to the carrier detect field prior to transmission of the another grouping.

12 more elements

Dependencies are inferred from the claim text.

Preamble formats for MIMO wireless communications

Life of this patent

Preamble formats for MIMO wireless communications

Life of this patent

Abstract

Claims20