Method and apparatus for transmitting an OFDM signal

A method comprising:

• transmitting a first orthogonal frequency-division multiplexing signal, the first orthogonal frequency-division multiplexing signal comprising a first signal burst, the first signal burst comprising
• a plurality of first fields of a first type and
• a plurality of pair fields, each of the pair fields comprising a second field of a second type and a third field of a third type, the second type being different than the first type, the third type being different than the first type and the second type
• wherein each of the first fields is transmittable prior to a corresponding one of the pair fields, and
• wherein the second field of one of the pair fields comprises an indicator to indicate (i) whether one of the first fields is transmitted subsequent to the one of the pair fields, and (ii) a duration of an inter-frame gap following the one of the pair fields;
• and
• determining a first number of the pair fields to be transmitted in the first signal burst of the first orthogonal frequency-division multiplexing signal.

An apparatus comprising:

• a transmitter configured to transmit a first orthogonal frequency-division multiplexing signal, the first orthogonal frequency-division multiplexing signal comprising a first signal burst, the first signal burst comprising
• a plurality of first fields of a first type, and
• a plurality of pair fields, each of the pair fields comprising a second field of a second type and a third field of a third type, the second type being different than the first type, the third type being different than the first type and the second type,
• wherein one of the first fields is transmittable prior to a corresponding one of the pair fields, and
• wherein the second field of one of the pair fields comprises an indicator to indicate whether one of the first fields is transmitted subsequent to the one of the pair fields;
• and
• a controller configured to select a first number of the pair fields to be transmitted in the first signal burst of the first orthogonal frequency-division multiplexing signal;
• and
• a receiver configured to receive a second orthogonal frequency-division multiplexing signal responsive to the first orthogonal frequency-division multiplexing signal, the second orthogonal frequency-division multiplexing signal comprising information corresponding to a quality of reception of the first orthogonal frequency-division multiplexing signal,
• wherein the controller selects a second number of the pair fields to be transmitted in a second signal burst based on the information corresponding to the quality of reception of the first orthogonal frequency-division multiplexing signal.

A method comprising:

• transmitting a first orthogonal frequency-division multiplexing signal, the first orthogonal frequency-division multiplexing signal comprising a first signal burst, the first signal burst comprising
• a plurality of first fields of a first type, and
• a plurality of pair fields, each of the pair fields comprising a second field of a second type and a third field of a third type, the second type being different than the first type, the third type being different than the first type and the second type,
• wherein each of the first fields in the first signal burst is transmittable prior to a corresponding one of the pair fields, and
• wherein the second field of one of the pair fields comprises an indicator to indicate whether one of the first fields is transmitted subsequent to the one of the pair fields;
• determining a first number of the pair fields to be transmitted in the first signal burst of the first orthogonal frequency-division multiplexing signal;
• receiving a second orthogonal frequency-division multiplexing signal responsive to the first orthogonal frequency-division multiplexing signal, the second orthogonal frequency-division multiplexing signal comprising information corresponding to a quality of reception of the first orthogonal frequency-division multiplexing signal;
• and
• selecting a second number of the pair fields to be transmitted in a second signal burst based on the information corresponding to the quality of reception of the first orthogonal frequency-division multiplexing signal.