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Multidimensional-DSP Beamformers Using the ROACH-2 FPGA Platform

Department of Electrical and Computer Engineering, University of Akron, Akron, OH 44325, USA
Department of Electrical and Computer Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
Author to whom correspondence should be addressed.
Academic Editor: Mostafa Bassiouni
Electronics 2017, 6(3), 49;
Received: 22 March 2017 / Revised: 13 June 2017 / Accepted: 20 June 2017 / Published: 1 July 2017
(This article belongs to the Special Issue Smart Antennas and MIMO Communications)
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Antenna array-based multi-dimensional infinite-impulse response (IIR) digital beamformers are employed in a multitude of radio frequency (RF) applications ranging from electronically-scanned radar, radio telescopes, long-range detection and target tracking. A method to design 3D IIR beam filters using 2D IIR beam filters is described. A cascaded 2D IIR beam filter architecture is proposed based on systolic array architecture as an alternative for an existing radar application. Differential-form transfer function and polyphase structures are employed in the design to gain an increase in the speed of operation to gigahertz range. The feasibility of practical implementation of a 4-phase polyphase 2D IIR beam filter is explored. A digital hardware prototype is designed, implemented and tested using a ROACH-2 Field Programmable Gate Array (FPGA) platform fitted with a Xilinx Virtex-6 SX475T FPGA chip and multi-input analog-to-digital converters (ADC) boards set to a maximum sampling rate of 960 MHz. The article describes a method to build a 3D IIR beamformer using polyphase structures. A comparison of technical specifications of an existing radar application based on phased-array and the proposed 3D IIR beamformer is also explained to illustrate the proposed method to be a better alternative for such applications. View Full-Text
Keywords: antenna arrays; beamforming; beam filter; multirate; polyphase; FPGA; ROACH-2; multi-dimensional; radar antenna arrays; beamforming; beam filter; multirate; polyphase; FPGA; ROACH-2; multi-dimensional; radar

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Seneviratne, V.; Madanayake, A.; Bruton, L.T. Multidimensional-DSP Beamformers Using the ROACH-2 FPGA Platform. Electronics 2017, 6, 49.

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