Extended guard interval for outdoor WLAN
First Claim
1. A method for generating a data unit for transmission via a wireless communication channel, the method comprising:
- selecting, at a wireless network interface device, a guard interval from a set of guard intervals including a first guard interval, a second guard interval, and a third guard interval, wherein the first guard interval has a length that is 50% of a length of the second guard interval, and wherein the length of the second guard interval is 50% of a length of the third guard interval;
generating, at the wireless network device, the data unit, wherein the data unit is generated to conform to a first communication protocol, wherein the data unit includes a preamble and a data portion;
generating, at the wireless network interface device, the preamble of the data unit to include;
a legacy signal field,a repetition of the legacy signal field, anda non-legacy field that includes a field that indicates the selected guard interval, wherein generating the preamble comprises generating the preamble such that (i) a legacy receiver configured to operate according to a legacy communication protocol but not according to the first communication protocol can determine a duration of the data unit by decoding the legacy signal field, and (ii) a receiver configured to operate according to the first communication protocol can detect that the data unit conforms to the first communication protocol; and
generating, at the wireless network interface device, the data portion of the data unit, including generating orthogonal frequency division multiplexing (OFDM) symbols of the data portion using the selected guard interval.
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Accused Products
Abstract
A wireless network interface device selects a guard interval from a set of guard intervals including a first guard interval, a second guard interval, and a third guard interval, where in the first guard interval has a length that is 50% of a length of the second guard interval, and wherein the length of the second guard interval is 50% of a length of the third guard interval. The wireless network interface device generates a preamble of a data unit to include: a legacy signal field, a repetition of the legacy field, and a non-legacy field that includes a field that indicates the selected guard interval. The wireless network interface device generates a data portion of the data unit, including generating orthogonal frequency division multiplexing (OFDM) symbols of the data portion using the selected guard interval.
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Citations
16 Claims
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1. A method for generating a data unit for transmission via a wireless communication channel, the method comprising:
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selecting, at a wireless network interface device, a guard interval from a set of guard intervals including a first guard interval, a second guard interval, and a third guard interval, wherein the first guard interval has a length that is 50% of a length of the second guard interval, and wherein the length of the second guard interval is 50% of a length of the third guard interval; generating, at the wireless network device, the data unit, wherein the data unit is generated to conform to a first communication protocol, wherein the data unit includes a preamble and a data portion; generating, at the wireless network interface device, the preamble of the data unit to include; a legacy signal field, a repetition of the legacy signal field, and a non-legacy field that includes a field that indicates the selected guard interval, wherein generating the preamble comprises generating the preamble such that (i) a legacy receiver configured to operate according to a legacy communication protocol but not according to the first communication protocol can determine a duration of the data unit by decoding the legacy signal field, and (ii) a receiver configured to operate according to the first communication protocol can detect that the data unit conforms to the first communication protocol; and generating, at the wireless network interface device, the data portion of the data unit, including generating orthogonal frequency division multiplexing (OFDM) symbols of the data portion using the selected guard interval. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus comprising:
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a wireless network interface device having one or more integrated circuits configured to select a guard interval from a set of guard intervals including a first guard interval, a second guard interval, and a third guard interval, wherein the first guard interval has a length that is 50% of a length of the second guard interval, and wherein the length of the second guard interval is 50% of a length of the third guard interval, and generate a data unit that conforms to a first communication protocol, wherein the data unit includes a preamble and a data portion; wherein the one or more integrated circuits are configured to generate the preamble of the data unit to include; a legacy signal field, a repetition of the legacy signal field, and a non-legacy field that includes a field that indicates the selected guard interval, wherein the preamble is generated such that (i) a legacy receiver configured to operate according to a legacy communication protocol but not according to the first communication protocol can determine a duration of the data unit by decoding the legacy signal field, and (ii) a receiver configured to operate according to the first communication protocol can detect that the data unit conforms to the first communication protocol; and wherein the one or more integrated circuits are further configured to generate the data portion of the data unit, including generating orthogonal frequency division multiplexing (OFDM) symbols of the data portion using the selected guard interval. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A tangible, non-transitory computer readable medium, or media, storing machine readable instructions that, when executed by one or more processors, cause the one or more processors to:
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select a guard interval from a set of guard intervals including a first guard interval, a second guard interval, and a third guard interval, wherein the first guard interval has a length that is 50% of a length of the second guard interval, and wherein the length of the second guard interval is 50% of a length of the third guard interval; cause a wireless network interface device to generate a data unit that conforms to a first communication protocol, wherein the data unit includes a preamble and a data portion; cause the wireless network interface device to generate the preamble of the data unit to include; a legacy signal field, a repetition of the legacy signal field, and a non-legacy signal field that includes a field that indicates the selected guard interval, wherein the preamble is generated such that (i) a legacy receiver configured to operate according to a legacy communication protocol but not according to the first communication protocol can determine a duration of the data unit by decoding the legacy signal field, and (ii) a receiver configured to operate according to the first communication protocol can detect that the data unit conforms to the first communication protocol; cause the wireless network interface device to generate the data portion of the data unit, including generating orthogonal frequency division multiplexing (OFDM) symbols of the data portion using the selected guard interval; and cause the wireless network interface device to transmit the data unit via a wireless communication channel. - View Dependent Claims (14, 15, 16)
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Specification