WiFi classification by pilot sequences
First Claim
Patent Images
1. A method for transmitting a data unit comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols, the method comprising:
- determining, at a communication device, a data unit format according to which a data unit is to be generated, the data unit format selected from a plurality of data unit formats;
selecting, at the communication device, a pilot sequence to be used for generating the data unit, whereinthe pilot sequence is selected from a plurality of pilot sequences corresponding to the plurality of data unit formats,the pilot sequence is selected based on the determined data unit format,selecting the pilot sequence includes selecting a parameter cn,k based on the data unit format,cn,k is a sequence for an n-th OFDM symbol, andk is an OFDM subcarrier index;
generating, at the communication device, the data unit to include the selected pilot sequence modulated on one or more pilot subcarriers of one or more OFDM symbols of the plurality of OFDM symbols, wherein generating the data unit to include the selected pilot sequence comprises;
generating one or more OFDM symbols of the plurality of OFDM symbols according to the sequence cn,k, andgenerating the data unit to include the selected pilot sequence, modulated on one or more pilot subcarriers, in one or more OFDM symbols corresponding to one or more fields of a physical layer (PHY) preamble that are after a legacy signal field in the PHY preamble and before a training field in the PHY preamble; and
transmitting, by the communication device, the data unit including the selected pilot sequence modulated on the one or more pilot subcarriers, wherein the selected pilot sequence modulated on the one or more pilot subcarriers signals to a receiving device the data unit format of the data unit.
4 Assignments
0 Petitions
Accused Products
Abstract
A communication device determines a format according to which a data unit is to be generated, and selects a pilot sequence to be used for generating the data unit. The pilot sequence is selected from a plurality of pilot sequences corresponding to a plurality of data unit formats, and the pilot sequence is selected based on the determined format. The communication device generates the data unit to include the selected pilot sequence, and transmits the data unit.
-
Citations
20 Claims
-
1. A method for transmitting a data unit comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols, the method comprising:
-
determining, at a communication device, a data unit format according to which a data unit is to be generated, the data unit format selected from a plurality of data unit formats; selecting, at the communication device, a pilot sequence to be used for generating the data unit, wherein the pilot sequence is selected from a plurality of pilot sequences corresponding to the plurality of data unit formats, the pilot sequence is selected based on the determined data unit format, selecting the pilot sequence includes selecting a parameter cn,k based on the data unit format, cn,k is a sequence for an n-th OFDM symbol, and k is an OFDM subcarrier index; generating, at the communication device, the data unit to include the selected pilot sequence modulated on one or more pilot subcarriers of one or more OFDM symbols of the plurality of OFDM symbols, wherein generating the data unit to include the selected pilot sequence comprises; generating one or more OFDM symbols of the plurality of OFDM symbols according to the sequence cn,k, and generating the data unit to include the selected pilot sequence, modulated on one or more pilot subcarriers, in one or more OFDM symbols corresponding to one or more fields of a physical layer (PHY) preamble that are after a legacy signal field in the PHY preamble and before a training field in the PHY preamble; and transmitting, by the communication device, the data unit including the selected pilot sequence modulated on the one or more pilot subcarriers, wherein the selected pilot sequence modulated on the one or more pilot subcarriers signals to a receiving device the data unit format of the data unit. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. An apparatus, comprising:
-
a network interface device having one or more integrated circuits (ICs) configured to; determine a data unit format according to which a data unit is to be generated, the data unit format selected from a plurality of data unit formats; select a pilot sequence to be used for generating the data unit, wherein the pilot sequence is selected from a plurality of pilot sequences corresponding to the plurality of data unit formats, the pilot sequence is selected based on the determined data unit format, selecting the pilot sequence includes selecting a parameter cn,k, cn,k is a sequence for an n-th OFDM symbol, and k is an OFDM subcarrier index; and wherein the one or more ICs are further configured to; generate the data unit to include the selected pilot sequence modulated on one or more pilot subcarriers of one or more orthogonal frequency division multiplexing (OFDM) symbols among a plurality of OFDM symbols of the data unit, wherein generating the data unit to include the selected pilot sequence comprises; generating one or more OFDM symbols of the plurality of OFDM symbols according to the sequence cn,k, and generating the data unit to include the selected pilot sequence, modulated on the one or more pilot subcarriers, in one or more fields of a physical layer (PHY) preamble that are after a legacy signal field in the PHY preamble and before a training field in the PHY preamble; and transmit the data unit including the selected pilot sequence modulated on the one or more pilot subcarriers, wherein the selected pilot sequence modulated on the one or more pilot subcarriers signals to a receiving device the data unit format of the data unit. - View Dependent Claims (8, 9, 10, 11, 12)
-
-
13. A method, comprising:
-
receiving, at a communication device, a data unit via a communication channel, the data unit comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols; determining, at the communication device, a pilot sequence modulated on one or more pilot subcarriers of one or more OFDM symbols of the plurality of OFDM symbols in the received data unit, wherein the pilot sequence is in one or more fields of a physical layer (PHY) preamble of the data unit, and wherein the one or more fields are after a legacy signal field in the PHY preamble and before a training field in the PHY preamble; identifying, at the communication device, the pilot sequence, modulated on the one or more pilot subcarriers, in the received data unit from a plurality of pilot sequences corresponding to a plurality of data unit formats, wherein identifying the pilot sequence comprises identifying a sequence cn,k, wherein n is an OFDM symbol index and k is an OFDM subcarrier index; determining, at the communication device, a data unit format of the received data unit corresponding to the identified pilot sequence modulated on the one or more pilot subcarriers; and processing, at the communication device, the received data unit according to the determined data unit format. - View Dependent Claims (14, 15, 16)
-
-
17. An apparatus, comprising:
a network interface device having one or more integrated circuits (ICs) configured to; receive a data unit via a communication channel, the data unit comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols, determine a pilot sequence modulated on one or more pilot subcarriers of one or more OFDM symbols of the plurality of OFDM symbols in the received data unit, wherein the pilot sequence is in one or more fields of a physical layer (PHY) preamble of the data unit, and wherein the one or more fields are after a legacy signal field in the PHY preamble and before a training field in the PHY preamble, identify the pilot sequence, modulated on the one or more pilot subcarriers, in the received data unit from a plurality of pilot sequences corresponding to a plurality of data unit formats, wherein identifying the pilot sequence comprises identifying a sequence cn,k, wherein n is an OFDM symbol index and k is an OFDM subcarrier index, determine a data unit format of the received data unit corresponding to the identified pilot sequence modulated on the one or more pilot subcarriers, and process the received data unit according to the determined data unit format. - View Dependent Claims (18, 19, 20)
Specification