Calibration methods and structures in wireless communications systems
First Claim
Patent Images
1. A method of calibrating and operating a wireless communications device, comprising the steps of;
- directing calibration signals through selected transceivers of said device via respective conduction paths of a conduction network; and
determining calibration coefficients from received versions of said calibration signals;
wherein said directing step includes the steps of;
directing calibration signals from a reference one of said transceivers to each of the other transceivers;
directing calibration signals from each of the other transceivers to said reference transceiver;
directing at least one calibration signal between a pair of the other transceivers; and
deriving said calibration coefficients from received versions of said calibration signals.
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Abstract
Calibration methods and structures are provided for wireless communications devices that compensate across a signal bandwidth for relative gain and phase errors between spatial communication channels while utilizing existing transceiver structures and facilitating the use of frequency-domain spatial processing. The methods and structures are directed to time-division duplex (TDD) systems, and are particularly suited to those that incorporate orthogonal frequency division multiplexing (OFDM).
249 Citations
34 Claims
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1. A method of calibrating and operating a wireless communications device, comprising the steps of;
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directing calibration signals through selected transceivers of said device via respective conduction paths of a conduction network; and determining calibration coefficients from received versions of said calibration signals; wherein said directing step includes the steps of; directing calibration signals from a reference one of said transceivers to each of the other transceivers; directing calibration signals from each of the other transceivers to said reference transceiver; directing at least one calibration signal between a pair of the other transceivers; and deriving said calibration coefficients from received versions of said calibration signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A self-calibrating wireless communications device, comprising;
- a plurality of transceivers;
a conduction network configured with conduction paths coupled to said transceivers; and
a calibration controller that directs calibration signals through selected ones of said transceivers via said conduction paths to determine calibration coefficients from received versions of said calibration signals;
wherein said conduction network is characterized by predetermined conduction parameters and;
said controller is configured to alter said received versions of said calibration signals with said conduction parameters to obtain relative transfer functions of said transceivers; and
said controller is further configured to determine said calibration coefficients from said relative transfer function. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
- a plurality of transceivers;
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26. A self-calibrating wireless communications device, comprising;
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a plurality of transceivers; a conduction network; and a calibration controller that directs calibration signals through selected ones of said transceivers via respective conduction paths of said conduction network to determine calibration coefficients from received versions of said calibration signals; and further including; a plurality of antennas each associated with one of said transceivers; and a baseband processor configured to; transform data signals from said antennas and said transceivers to recover training signals; spatially weight frequency-domain components of said data signals in accordance with differences between said training signals and predetermined signal parameters; and correct frequency-domain components of said data signals with said calibration coefficients. - View Dependent Claims (27, 28)
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29. A self-calibrating wireless communications device, comprising;
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a plurality of transceivers; a conduction network; and a calibration controller that directs calibration signals through selected ones of said transceivers via respective conduction paths of said conduction network to determine calibration coefficients from received versions of said calibration signals; and further including; a plurality of antennas each associated with one of said transceivers; and a baseband processor configured to; apply spatial weights to frequency-domain components of baseband data signals;
correct frequency-domain components of said baseband data signals with said calibration coefficients; andtransform said baseband data signals to radiate them from said antennas via said transceivers.
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30. A wireless communications system, comprising:
- a plurality of communications devices that exchange data signals wherein at least one of said devices includes;
a plurality of transceivers;
a conduction network configured with conduction paths coupled to said transceivers; and
a calibration controller that directs calibration signals through selected ones of said transceivers via said conduction paths to determine calibration coefficients from received versions of said calibration signals;
wherein said conduction network is characterized by predetermined conduction parameters and;
said controller is configured to alter said received versions of said calibration signals with said conduction parameters to obtain relative transfer functions of said transceivers; and
said controller is further configured to determine said calibration coefficients from said relative transfer functions. - View Dependent Claims (31, 32)
- a plurality of communications devices that exchange data signals wherein at least one of said devices includes;
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33. A wireless communications system, comprising:
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a plurality of communications devices that exchange data signals wherein at least one of said devices includes; a plurality of transceivers; a conduction network; and a calibration controller that directs calibration signals through selected ones of said transceivers via respective conduction paths of said conduction network to determine calibration coefficients from received versions of said calibration signals; and further including; a plurality of antennas each associated with one of said transceivers; and a baseband processor configured to; transform data signals from said antennas and said transceivers to recover training signals; spatially weight frequency-domain components of said data signals in accordance with differences between said training signals and predetermined signal parameters; and correct frequency-domain components of said data signals with said calibration coefficients.
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34. A wireless communications system, comprising:
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a plurality of communications devices that exchange data signals wherein at least one of said devices includes; a plurality of transceivers; a conduction network; and a calibration controller that directs calibration signals through selected ones of said transceivers via respective conduction paths of said conduction network to determine calibration coefficients from received versions of said calibration signals; and further including; a plurality of antennas each associated with one of said transceivers; and a baseband processor configured to; apply spatial weights to frequency-domain components of baseband data signals; correct frequency-domain components of said baseband data signals with said calibration coefficients; and transform said baseband data signals to radiate them from said antennas via said transceivers.
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Specification