IDEA

•Cellular towers (FDMA) are now being upgraded into adaptive ones to cancel out the environmental effects to an extent(geostatistics), in the reception path.

•The next upgrade would be to allocate transmission adaptively, paving way to a cognitive system that can intelligently allocate frequencies for usage of the spectral holes.

•The Frequency voids can be used for certain applications.

Certain Assumptions:

1. Lower frequency bands are considered (bandwidth as 100Hz).

2. Noise added is AWGN with SNR 15.

3. Adaptive filter order is taken as 32.

4. Signal threshold for a receiver is taken.

The system has the following applications.

•As most of the cellular systems are having a patched array, capable of narrow beam-forming we can use that to direct into airspace to track drones.

•The water has 43% reflectivity at radio frequencies, so we can use these radio/cellular towers to map water bodies in a region. (conditions for reception)

•A distributed low altitude radar system can be built out of a locality of cellular towers working in cohesion.

References:

•An Efficient DLMS Adaptive Filter Architecture - International Journal of Innovative Research in Electrical, Electronics, Instrumentation and Control Engineering.

•Doppler activity for radar – Wikipedia

•MATLAB documentation – 2016A version.

•Help to generate radar chirp signal – MATLAB forum.

•Cognitive radar signal processing - Antonio De Maio, Alfonso Farina, Universita degli Studi di Napoli “Federico II” .

•Adaptive filter based on least mean square algorithm – National Institute of Ocean technology, Sireesha N, Tata Sudhakar, Chitra.

•REFLECTIVITY OF ELECTROMAGNETIC WAVES AT AN AIR-WATER INTERFACE FOR PURE AND SEA WATER - Larry K. Lepley, William M. Adams, 1968.