Wireless communication device and method for reducing carrier frequency offsets over a simultaneous multi-user uplink in a multicarrier communication network
First Claim
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1. A method for concurrently receiving transmissions from more than one wireless device, the method comprising:
- transmitting a polling frame addressed to each of a plurality of wireless devices using two or more transmit antennas; and
receiving uplink packets concurrently from each of the wireless devices over a same set of orthogonal frequency division multiplexed (OFDM) subcarriers;
wherein each wireless device generates a carrier frequency offset (CFO) estimate from the received polling frame and concurrently applies its CFO estimate to the station'"'"'s simultaneous transmissions of an uplink packet,wherein each uplink packet includes a short training field transmitted concurrently by each wireless device on a same set of OFDM subcarriers, followed by a plurality of frequency interleaved long training fields transmitted concurrently by each wireless device on differing sets of OFDM subcarriers.
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Abstract
Each of a plurality of multicarrier wireless communication devices generate a carrier frequency offset (CFO) estimate from a downlink polling frame (302) and apply the CFO estimate to signals prior to transmission to a receiving station over a multi-user uplink.
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Citations
12 Claims
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1. A method for concurrently receiving transmissions from more than one wireless device, the method comprising:
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transmitting a polling frame addressed to each of a plurality of wireless devices using two or more transmit antennas; and receiving uplink packets concurrently from each of the wireless devices over a same set of orthogonal frequency division multiplexed (OFDM) subcarriers; wherein each wireless device generates a carrier frequency offset (CFO) estimate from the received polling frame and concurrently applies its CFO estimate to the station'"'"'s simultaneous transmissions of an uplink packet, wherein each uplink packet includes a short training field transmitted concurrently by each wireless device on a same set of OFDM subcarriers, followed by a plurality of frequency interleaved long training fields transmitted concurrently by each wireless device on differing sets of OFDM subcarriers. - View Dependent Claims (2, 3, 4, 5)
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6. A multi-antenna base station to concurrently communicate with a plurality of wireless devices over an orthogonal frequency division multiplexed (OFDM) channel comprising:
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a transmitter configured to transmit a polling frame addressed to each of the wireless devices using two or more transmit antennas; and a receiver configured to receive uplink packets concurrently from each of the wireless devices over a same set of OFDM subcarriers; wherein each wireless device generates a carrier frequency offset (CFO) estimate from the received polling frame and concurrently applies its CFO estimate to the station'"'"'s simultaneous transmissions of an uplink packet, and wherein each uplink packet includes a short training field transmitted concurrently by each wireless device on a same set of OFDM subcarriers, followed by a plurality of frequency interleaved long training fields transmitted concurrently by each wireless device on differing sets of OFDM subcarriers. - View Dependent Claims (7, 8, 9, 10)
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11. A multicarrier wireless communication device comprising:
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carrier frequency offset (CFO) estimating circuitry to generate a CFO estimate from a received polling frame; and CFO application circuitry to apply the CFO estimate to multicarrier signals prior to a transmission of an uplink packet to a multi-antenna base station concurrently with uplink packets transmitted by a plurality of other wireless communication devices, wherein the polling frame is transmitted concurrently to the wireless communication devices from the multi-antenna base station, and wherein each uplink packet includes a short training field transmitted concurrently by each wireless device on a same set of OFDM subcarriers, followed by a plurality of frequency interleaved long training fields transmitted concurrently by each wireless device on differing sets of OFDM subcarriers. - View Dependent Claims (12)
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Specification