Calibration Correction for Implicit Beamforming in a Wireless MIMO Communication System
First Claim
1. A method of beamforming within a communication system having a first transceiver device having a first plurality of antennas and a second transceiver device having a second plurality of antennas, the method comprising:
- determining a partial dimensional description of a reverse channel, wherein a signal travels from the second transceiver device to the first transceiver device via the reverse channel;
developing a correction matrix from the partial dimensional description of the reverse channel and a description of the forward channel via which a signal travels from the first transceiver device to the second transceiver device;
using the correction matrix to process signals to be transmitted via the forward channel; and
using a steering matrix to perform beamforming in the forward channel.
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Abstract
A transmitter beamforming technique for use in a MIMO wireless communication system determines a partial description of a reverse channel without determining a full dimensional description of the reverse channel. A correction matrix is developed from the partial description of the reverse channel and a description of the forward channel. The correction matrix is used to process signals to be transmitted via the forward channel, and a steering matrix is used to perform beamforming in the forward channel.
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Citations
47 Claims
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1. A method of beamforming within a communication system having a first transceiver device having a first plurality of antennas and a second transceiver device having a second plurality of antennas, the method comprising:
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determining a partial dimensional description of a reverse channel, wherein a signal travels from the second transceiver device to the first transceiver device via the reverse channel;
developing a correction matrix from the partial dimensional description of the reverse channel and a description of the forward channel via which a signal travels from the first transceiver device to the second transceiver device;
using the correction matrix to process signals to be transmitted via the forward channel; and
using a steering matrix to perform beamforming in the forward channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A wireless transceiver for transmitting signals to one or more other communication devices, the wireless transceiver comprising:
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a multiplicity of antennas;
a beamforming network coupled to the multiplicity of antennas;
a controller coupled to the beamforming network to control the beamforming network using a steering matrix and to use a correction matrix to process signals to be transmitted via a forward channel; and
a correction matrix calculation unit that obtains a description of the forward channel, obtains a partial dimensional description of a reverse channel, and develops the correction matrix from the description of the forward channel and the partial dimensional description of the reverse channel; and
a steering matrix calculation unit adapted to develop the steering matrix. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A method of beamforming within a communication system having a first transceiver with a first plurality of antennas and a second transceiver having a second plurality of antennas, the method comprising:
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transmitting a calibration initiation packet via a forward channel, the calibration initiation packet including a signal indicative of a request for an acknowledgment packet, wherein a signal travels from the first transceiver to the second transceiver via the forward channel;
receiving via a reverse channel an acknowledgment packet in response to the signal indicative of the request for the acknowledgment packet, wherein a signal travels from the second transceiver to the first transceiver via the reverse channel; and
determining a partial dimensional description of the reverse channel based on the reception of the acknowledgment packet;
developing a correction matrix based on the partial dimensional description of the reverse channel and a description of the forward channel;
using the correction matrix to process signals to be transmitted via the forward channel; and
using a steering matrix to perform beamforming in the forward channel. - View Dependent Claims (43, 44)
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45. A wireless transceiver for transmitting signals to one or more other communication devices, the wireless transceiver comprising:
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a multiplicity of antennas;
a beamforming network coupled to the multiplicity of antennas;
a controller coupled to the beamforming network to control the beamforming network using a steering matrix, to use a correction matrix to process signals to be transmitted via a forward channel, and to cause the transceiver to transmit a calibration initiation packet via the forward channel, the calibration initiation packet including a signal indicative of a request for an acknowledgment packet;
a correction matrix calculation unit that obtains a description of a forward channel via a reverse channel, determines a partial dimensional description of the reverse channel based on a reception of an acknowledgment packet via the reverse channel, and develops the correction matrix from the description of the forward channel and the partial dimensional description of the reverse channel; and
a steering matrix calculation unit adapted to develop the steering matrix. - View Dependent Claims (46, 47)
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Specification