Exploring transmit null forming in open-loop coherent distributed arrays

Michael V. Lipski; Sastry Kompella; Ram M. Narayanan

doi:10.1117/12.2560302

23 April 2020 Exploring transmit null forming in open-loop coherent distributed arrays

Michael V. Lipski, Sastry Kompella, Ram M. Narayanan

Proceedings Volume 11408, Radar Sensor Technology XXIV; 114080X (2020) https://doi.org/10.1117/12.2560302
Event: SPIE Defense + Commercial Sensing, 2020, Online Only

Abstract

Mobile ad hoc networks (MANETs) consisting of nodes with single omnidirectional antennas and limited transmit power can support wireless connectivity over long distances through coherent operation. Although designed for short-range networked communication, the individual radio nodes in a MANET can be coordinated to form a sparse aperiodic array with a high power directional gain. By targeting a distant receiver with the array beam synthesized by a synchronized transmission, the MANET can ensure greater signal quality at the receiver. The sparse nature of the array coupled with the mobility-driven randomization of node positions makes the array gain somewhat uncontrollable outside of the main beam. Our work investigates methods of shaping the pattern of a coherent distributed transmit array using open-loop beamforming. A null-forming algorithm based on a partitioning of the network nodes into two sub-arrays is presented. Simulation results demonstrate the attenuation of the array factor in the desired null direction. A stochastic optimization step is also introduced.

Conference Presentation

Citation Download Citation

Michael V. Lipski, Sastry Kompella, and Ram M. Narayanan "Exploring transmit null forming in open-loop coherent distributed arrays", Proc. SPIE 11408, Radar Sensor Technology XXIV, 114080X (23 April 2020); https://doi.org/10.1117/12.2560302

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