Method of detecting packet bandwidth in a wireless ofdm network with multiple overlapped frequency bands
AssigneeApplied Transform, LLC
InventorJoon Bae KIM
Life of this patent
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Abstract
A wireless OFDM transceiver uses a method of detecting subcarrier characteristics, such as phase and amplitude, to determine the bandwidth of a received packet. By detecting different subcarrier characteristics in the long training symbols of a packet at the receiver, the packet is associated with different bandwidths. The different bandwidths are used in a wireless network where devices can communicate using two frequency bands that overlap one another and where one is wider than the other.
Claims20
1-330. (canceled)
A method in a wireless OFDM transceiver, the method comprising:
- receiving a first packet using wireless OFDM communications, wherein the first packet comprises a first plurality of short training symbols followed by a first plurality of long training symbols followed by a first header portion;
- detecting that the first packet is associated with a first channel bandwidth based on at least one of a first phase and a first amplitude of at least one subcarrier in the first plurality of long training symbols;
- receiving a second packet using wireless OFDM communications, wherein the second packet comprises a second plurality of short training symbols followed by a second plurality of long training symbols followed by a second header portion;
- and
- detecting that the second packet is associated with a second channel bandwidth based on at least one of a second phase and a second amplitude of the at least one subcarrier in the second plurality of long training symbols,
- wherein at least one of:
- the first phase is different from the second phase, and the first amplitude is different from the second amplitude,
- wherein the first channel bandwidth and the second channel bandwidth have one or more overlapping frequency regions, and
- wherein the second channel bandwidth is wider than the first channel bandwidth.
A method in a wireless OFDM transceiver, the method comprising:
- receiving a packet using wireless OFDM communications, wherein the packet comprises a plurality of short training symbols followed by a plurality of training symbols followed by a header portion;
- and
- detecting that the packet is associated with one of a first channel bandwidth and a second channel bandwidth,
- wherein the detection that the packet is associated with the first channel bandwidth is based on at least one of a first phase and a first amplitude of at least one subcarrier in the plurality of long training symbols,
- wherein the detection that the packet is associated with the second channel bandwidth is based on at least on one of a second phase and a second amplitude of the at least one subcarrier in the plurality of long training symbols,
- wherein at least one of:
- the first phase is different from the second phase, and the first amplitude is different from the second amplitude,
- wherein the first channel bandwidth and the second channel bandwidth have one or more overlapping frequency regions, and
- wherein the second channel bandwidth is wider than the first channel bandwidth.
A method in a wireless OFDM transceiver, the method comprising:
- receiving a packet using wireless OFDM communications, wherein the packet comprises a plurality of short training symbols followed by a plurality of long training symbols followed by a header portion;
- and
- using at least one of a phase and an amplitude of at least one subcarrier in the plurality of long training symbols to determine that the packet is associated with one of a first channel bandwidth of X MHz and a second channel bandwidth of 2X MHz, wherein X is a number greater than 0,
- wherein the first and second channel bandwidth have one or more overlapping frequency regions.
Dependencies are inferred from the claim text.