Fast convergence to optimal beam patterns
AssigneeNEC Laboratories America, Inc.
InventorsNarayan Prasad, Kishore Ramachandran
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Abstract
Systems and methods for joint training of beam patterns in a system having a transmitter and a receiver. Initial transmit and receive beam pattern vectors are first selected. The beam pattern vectors are perturbed to produce a plurality of perturbed transmit and receive beam pattern vectors. A received signal power between the transmitter and the receiver is estimated for each combination of the perturbed transmit and the perturbed receive beam pattern vectors. The transmit and receive beam pattern vectors having a highest received signal power are applied to the transmitter and the receiver respectively. The perturbation, estimation, and application steps are iterated until the received signal power meets a convergence criterion.
Claims19
A method for joint training of beam patterns in a system having a transmitter and a receiver, comprising:
- selecting initial transmit and receive beam pattern vectors;
- perturbing the beam pattern vectors to produce a plurality of perturbed transmit and receive beam pattern vectors;
- estimating a received signal power between a transmitter and a receiver for each combination of the perturbed transmit and the perturbed receive beam pattern vectors;
- applying the transmit and receive beam pattern vectors having a highest received signal power to the transmitter and the receiver respectively;
- and
- producing globally optimal transmit and receive beam patterns by repeating said steps of perturbing, estimating, and applying until the received signal power meets a convergence criterion.
A method for selecting a subset of antennas for a first antenna array having a specified cardinality in a system having two antenna arrays, comprising:
- determining a plurality of beam pattern vectors for a first antenna array;
- transmitting a known sequence using one or more beam pattern vectors;
- estimating a channel gain at the receiver for each choice of beam pattern vector;
- and
- computing an estimate of an array response vector and selecting a subset of the specified cardinality comprising indices such that the corresponding elements of the estimated array response vector are maximized.
A radio communication system, comprising:
- a transmitter array, comprising a plurality of component antennas, configured to transmit signals according to a first beam pattern;
- a receiver array, comprising a plurality of component antennas, configured to receive signals according to a second beam pattern;
- and
- a feedback link configured to communicate beam pattern information from the receiver to the transmitter, wherein the transmitter array trains the first beam pattern using the beam pattern information,
- wherein the transmitter array and the receiver array jointly train the first and second beam patterns.
Dependencies are inferred from the claim text.