Patent ID: 7881671
Filing Date: 2011-02-01
Classification: H04W

Abstract:
1. A data retrieval device, the data retrieval device comprising: a plurality of antennas configured to transmit a first signal toward a plurality of wireless sensor nodes and to receive a second signal from the plurality of wireless sensor nodes, the second signal including a sensed datum, the sensed datum identified at the plurality of wireless sensor nodes; and a processor coupled to receive the second signal from the plurality of antennas, the processor defining a virtual receive signal from the received second signal for the plurality of antennas, wherein defining the virtual receive signal comprises defining a discrete Fourier transform matrix whose columns form an orthonormal basis for a spatial signal space, and further wherein the discrete Fourier transform matrix columns are normalized steering vectors for virtual angles corresponding to beamforming in a plurality of virtual directions, and processing the defined virtual receive signal to determine the sensed datum.