Channel estimation and tracking

A method of transmitting in a wireless network, the method comprising:

• sweeping positions of first and second pilot tones in a plurality of subcarriers between a plurality of symbols of a packet, a symbol of the plurality of symbols including the first and second pilot tones, a plurality of data subcarriers, a plurality of guard subcarriers, and a Direct Current (DC) subcarrier, the sweeping positions of the first and second pilot tones comprising selecting, based on one or more channel conditions, the positions of the first and second pilot tones such that an amount of time a pilot tone occupies a subcarrier depends on at least one parameter selected from the group consisting of the channel conditions and a length of the packet;
• and
• transmitting the packet in a 1 Mega Hertz bandwidth.

An apparatus to transmit in a wireless network, the apparatus comprising:

• a transceiver configured to sweep positions of first and second pilot tones in a plurality of subcarriers between a plurality of symbols of a packet, the transceiver to avoid a positioning of the first and second pilot tones adjacent nulled subcarriers or adjacent subcarriers that are adjacent nulled subcarriers, a symbol of the plurality of symbols including the first and second pilot tones, a plurality of data subcarriers, a plurality of guard subcarriers, and a Direct Current (DC) subcarrier;
• and
• one or more antennas operably coupled to the transceiver to transmit the packet in a 1 Mega Hertz bandwidth.

An apparatus to transmit in a wireless network, the apparatus comprising:

• a transceiver configured to sweep positions of first and second pilot tones in a plurality of subcarriers between a plurality of symbols of a packet, the transceiver to select the positions of the first and second pilot tones, based on one or more channel conditions, such that an amount of time a pilot tone occupies a subcarrier depends on at least one parameter selected from a group consisting of the channel conditions and a length of the packet, a symbol of the plurality of symbols including the first and second pilot tones, a plurality of data subcarriers, a plurality of guard subcarriers, and a Direct Current (DC) subcarrier;
• and
• one or more antennas operably coupled to the transceiver to transmit the packet in a 1 Mega Hertz bandwidth.

A non-transitory machine-accessible medium that is to provide instructions, which when accessed, cause a machine to perform operations, the non-transitory machine-accessible medium comprising:

• code to cause at least one computer to sweep positions of first and second pilot tones in a plurality of subcarriers between a plurality of symbols of a packet, while avoiding a positioning of the first and second pilot tones adjacent nulled subcarriers or adjacent subcarriers that are adjacent the nulled subcarriers, a symbol of the plurality of symbols including the first and second pilot tones, a plurality of data subcarriers, a plurality of guard subcarriers, and a Direct Current (DC) subcarrier;
• and
• code to cause the at least one computer to wirelessly transmit the packet in a 1 Mega Hertz bandwidth.

A non-transitory machine-accessible medium that is to provide instructions, which when accessed, cause a machine to perform operations, the non-transitory machine-accessible medium comprising:

• code to cause at least one computer to sweep positions of first and second pilot tones in a plurality of subcarriers between a plurality of symbols of a packet, the code to cause the computer to select the positioning of the first and second pilot tones, based on one or more channel conditions, such that an amount of time a pilot tone occupies a subcarrier depends on at least one parameter selected from the group consisting of the channel conditions and a length of the packet, a symbol of the plurality of symbols including the first and second pilot tones, a plurality of data subcarriers, a plurality of guard subcarriers, and a Direct Current (DC) subcarrier;
• and
• code to cause the at least one computer to wirelessly transmit the packet in a 1 Mega Hertz bandwidth.