TRANSCEIVER THAT INDICATES THE PACKET BANDWIDTH IN A WIRELESS OFDM NETWORK WITH MULTIPLE OVERLAPPED FREQUENCY BANDS
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Abstract
A wireless OFDM transceiver uses subcarrier characteristics, such as phase and amplitude, to detect 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 different frequency bands that overlap one another and where one is wider than the other.
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Citations
346 Claims
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1-330. -330. (canceled)
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331. A wireless OFDM transceiver operable to:
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transmit 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; indicate 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; transmit 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 indicate 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. - View Dependent Claims (332, 333, 334, 335, 336, 337)
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338. A wireless OFDM transceiver operable to:
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transmit 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 indicate that the packet is associated with one of a first channel bandwidth and a second channel bandwidth, wherein the indication 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 indication that the packet is associated with the second channel bandwidth is based on at least 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. - View Dependent Claims (339, 340, 341, 342)
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343. A wireless OFDM transceiver operable to:
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transmit 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 use at least one of a phase and an amplitude of at least one subcarrier of the plurality of long training symbols to indicate 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. - View Dependent Claims (344, 345, 346)
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Specification