Calibrating a retro-directive array for an asymmetric wireless link
AssigneeLattice Semiconductor Corporation
InventorsFarshid Aryanfar, Jihong Ren
Life of this patent
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Abstract
The disclosed embodiments relate to a technique for calibrating a retro-directive array. During the calibration process, the system measures a gain g1 through a first pair of antennas in the retro-directive array. Next, the system measures a gain g2 through a second pair of antennas in the retro-directive array. The system then simultaneously measures a combined gain G1,2 through the first and second pairs of antennas in the retro-directive array. If G1,2 is less than g1+g2 by more than a threshold value, the system calibrates a phase relationship between the first and second pairs of antennas.
Claims19
A method for calibrating a retro-directive array, comprising:
- measuring a gain g1 through a first pair of antennas in the retro-directive array;
- measuring a gain g2 through a second pair of antennas in the retro-directive array;
- simultaneously measuring a combined gain G1,2 of the first and second pairs of antennas in the retro-directive array;
- and
- if G1,2 is less than g1+g2 by more than a threshold value, calibrating a phase relationship between the first and second pairs of antennas.
An apparatus for calibrating a remote retro-directive array, comprising:
- a phase array configured to communicate with the remote retro-directive array;
- and
- a controller coupled to the phase array and configured to perform operations to calibrate the remote retro-directive array, wherein the operations include,
- measuring a gain g1 through a first pair of antennas in the remote retro-directive array,
- measuring a gain g2 through a second pair of antennas in the remote retro-directive array,
- simultaneously measuring a combined gain G1,2 through the first and second pairs of antennas in the remote retro-directive array, and
- if G1,2 is less than g1+g2 by more than a threshold value, calibrating a phase relationship between the first and second pairs of antennas in the remote retro-directive array.
A retro-directive array, comprising:
- an array of antennas, wherein pairs of antennas in the array are coupled together through circuits to form a retro-directive array;
- a command interface configured to receive activation commands to activate pairs of antennas in the retro-directive array;
- and
- an activation circuit, wherein in response to receiving one or more activation commands, the activation circuit is configured to activate one or more pairs of antennas in the retro-directive array, while other pairs of antennas in the retro-directive array remain inactive.
Dependencies are inferred from the claim text.