Auto-Calibrating Adaptive Array for Mobile Communications
IEEE Transactions on Aerospace and Electronic Systems,vol.36, no.2, April 2000.
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A major concern for adaptive antennas is the calibration of
hardware. Here we consider the calibration of an analog beamformer, which calculates the
weights in a DSP, but weights the RF signals using
a hardware beamformer. This paper presents two novel methods of performing a
calibration of this adaptive antenna during normal operation.
This will mitigate temperature drift and aging of
active components. Both methods uses a feedback of the
beamformer output signal, to calculate the error in the beamformer
output, or to identify the parameters in the temperature drift. The algorithms are transparent to normal
antenna operation and are computationally simple.
Simulations show that when using these
auto-calibration methods, the performance is independent of variation
in hardware parameters when a realistic temperature drift is
introduced. The proposed algorithms are intended for use in a TDMA mobile
telephone system, but the methods are applicable in
radar systems also.