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An approach based on electromechanical systems (MEMS) technology will be presented that essentially eliminates the problem of 1/f noise in small magnetic sensors. The sensor based on this approach, the MEMS flux concentrator sensor, should outperform all other high sensitivity vector magnetometers in terms of cost, power consumption, and sensitivity. The method for achieving this improvement is to...
Some of the major contributions to noise in magnetic sensors can only be reduced by increasing the size of the sensor. Here we present an approach for reducing 1/f noise in large magnetic sensors. The approach is based on modulating the field by rotating a disc containing permalloy flux concentrators or flux guides. The disc rotation is driven by an air turbine. Modulation frequencies as high as 76...
Using CDMA technology, one has to contend with interference in frequency-selective channels caused by multipath propagation and fading. Transmitter-based methods such as zero forcing joint transmission and transmit Wiener filter only reduce the bit error rate indirectly and do not exploit the knowledge of the transmit data symbols. Nonlinear optimization strategies, e.g., the Constrained Minimum BER...
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