Differential mimo transceiver
AssigneeWisconsin Alumni Research Foundation
InventorsAkbar M. Sayeed, John H. Brady
Life of this patent
Estimating the term…
Abstract
A method of estimating a spatial filter matrix is provided. A conjugate of a received first signal defines a conjugate first signal. A Kronecker product of the defined first signal and a received second signal define a differential measurement signal. The computations are repeated for a plurality of first and second signals sufficient to compute an estimate of a channel matrix from the differential measurement signals. A spatial filter matrix is computed from the computed estimate of the channel matrix. The computed spatial filter matrix is used in a data communication phase between the first plurality of antennas and the second plurality of antennas.
Claims20
A method of estimating a spatial filter matrix, the method comprising:
- (a) receiving a first signal by a receiver, the first signal received from a first plurality of antennas, wherein the first signal is a result of a first transmitted signal transmitted by a second plurality of antennas;
- (b) computing a conjugate of the received first signal to define a conjugate first signal;
- (c) receiving a second signal by the receiver from the first plurality of antennas, wherein the second signal is received after the first signal, wherein the second signal is a result of a second transmitted signal transmitted by the second plurality of antennas;
- (d) computing a Kronecker product of the defined conjugate first signal and the received second signal to define a differential measurement signal;
- (e) repeating (a) to (d) for a plurality of first and second signals sufficient to compute an estimate of a channel matrix;
- computing the estimate of the channel matrix from the differential measurement signals defined in (d);
- and
- computing a spatial filter matrix from the computed estimate of the channel matrix;
- wherein the computed spatial filter matrix is used in a data communication phase between the first plurality of antennas and the second plurality of antennas.
A receiver comprising:
- a processor configured to
- (a) receive a first signal, the first signal received from a first plurality of antennas, wherein the first signal is a result of a first transmitted signal transmitted by a second plurality of antennas;
- (b) compute a conjugate of the received first signal to define a conjugate first signal;
- (c) receive a second signal from the first plurality of antennas, wherein the second signal is received after the first signal, wherein the second signal is a result of a second transmitted signal transmitted by the second plurality of antennas;
- (d) compute a Kronecker product of the defined conjugate first signal and the received second signal to define a differential measurement signal;
- (e) repeat (a) to (d) for a plurality of first and second signals sufficient to compute an estimate of a channel matrix;
- compute the estimate of the channel matrix from the differential measurement signals defined in (d);
- and
- compute a spatial filter matrix from the computed estimate of the channel matrix;
- wherein the computed spatial filter matrix is used in a data communication phase between the first plurality of antennas and the second plurality of antennas.
A transmitter comprising:
- a processor configured to
- (a) receive a first signal, the first signal received from a first plurality of antennas, wherein the first signal is a result of a first transmitted signal transmitted by a second plurality of antennas;
- (b) compute a conjugate of the received first signal to define a conjugate first signal;
- (c) receive a second signal from the first plurality of antennas, wherein the second signal is received after the first signal, wherein the second signal is a result of a second transmitted signal transmitted by the second plurality of antennas;
- (d) compute a Kronecker product of the defined conjugate first signal and the received second signal to define a differential measurement signal;
- (e) repeat (a) to (d) for a plurality of first and second signals sufficient to compute an estimate of a channel matrix;
- compute the estimate of the channel matrix from the differential measurement signals defined in (d);
- compute a spatial filter matrix from the computed estimate of the channel matrix;
- and
- transmit a third signal to the second plurality of antennas, wherein the third signal is precoded using the computed spatial filter matrix.
Dependencies are inferred from the claim text.