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 multicarrier wireless communication device comprising:
- 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 transmission,wherein the wireless communication device is one of a plurality of wireless communication stations,wherein the polling frame is addressed to each wireless communication station of the plurality,wherein, in response to the polling frame, each wireless communication station concurrently transmits an uplink packet based on information in the polling frame, andwherein each wireless communication station generates a CFO estimate from the polling frame and applies the CFO estimate to the station'"'"'s simultaneous transmissions of the uplink packet.
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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
24 Claims
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1. 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 transmission, wherein the wireless communication device is one of a plurality of wireless communication stations, wherein the polling frame is addressed to each wireless communication station of the plurality, wherein, in response to the polling frame, each wireless communication station concurrently transmits an uplink packet based on information in the polling frame, and wherein each wireless communication station generates a CFO estimate from the polling frame and applies the CFO estimate to the station'"'"'s simultaneous transmissions of the uplink packet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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generating a carrier frequency offset (CFO) estimate from a received polling frame; and applying the CFO estimate to multicarrier signals prior to transmission, wherein the method is performed at each of a plurality of wireless communication stations, wherein the polling frame is addressed to each wireless communication station of the plurality, wherein, in response to the polling frame, each wireless communication station concurrently transmits an uplink packet based on information in the polling frame, and wherein each wireless communication station generates a CFO estimate from the polling frame and applies the CFO estimate to transmission of the uplink packets. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A multicarrier receiver comprising:
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a plurality of coefficient separators, each coefficient separator to separate Fourier coefficient associated with signals transmitted by one of a plurality of transmitting stations; processing circuitry to conjugate multiply two consecutive sets of the separated Fourier coefficients to generate a carrier frequency offset (CFO) estimate for each of the transmitting stations; and discrete Fourier transform (DFT) circuitry to perform a DFT on first and second sets of receive baseband samples associated with the consecutive sets of the separated Fourier coefficients and generate Fourier coefficients for each subcarrier frequency of a multicarrier communication signal, wherein the processing circuitry comprises; frame-delay circuitry to delay the separated Fourier coefficients associated with the first set of baseband samples; and a multiplier to multiply a delayed and transposed version of the separated Fourier coefficient associated with a first set of baseband samples with separated Fourier coefficients associated with a second set of baseband samples to generate a complex vector output for an associated one of the transmitting stations. - View Dependent Claims (18, 19)
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20. A method comprising;
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separating Fourier coefficients associated with signals transmitted by each of a plurality of transmitting stations; conjugate multiplying two consecutive sets of the separated Fourier coefficients to generate a carrier frequency offset (CFO) estimate for each of the transmitting stations; performing a discrete Fourier transform (DFT) on first and second sets of receive baseband samples associated with the consecutive sets of the separated Fourier coefficients to generate Fourier coefficients for each subcarrier frequency of a multicarrier communication signal; delaying the separated Fourier coefficients associated with the first set of baseband samples; and multiplying a delayed and transposed version of the separated Fourier coefficient associated with a first set of baseband samples with separated Fourier coefficients associated with a second set of baseband samples to generate a complex vector output. - View Dependent Claims (21, 22)
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23. A computer readable medium that stores instructions for execution by one or more processors, to perform operations comprising:
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generating a carrier frequency offset (CFO) estimate from a received polling frame; and applying the CFO estimate to multicarrier signals prior to transmission, wherein the operations are performed at each of a plurality of wireless communication stations, wherein the polling frame is transmitted by a managing communication station, the polling frame being addressed to each wireless communication station of the plurality, wherein, in response to the polling frame, each wireless communication station concurrently transmits an uplink packet based on information in the polling frame, and wherein each wireless communication station generates a CFO estimate from the polling frame and applies the CFO estimate concurrent transmissions of the uplink packets. - View Dependent Claims (24)
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Specification