Broadband Multiple Cone-Beam 3-D IIR Digital Filters Applied to Planar Dense Aperture Arrays

Multidim Syst Sign Process

et al. 2016

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A digital hardware architecture is proposed for computation of filter coefficients of 1st-and 2nd-order 2-D IIR beam/fan filters, which are capable of enhancement of RF plane-waves based on their direction of arrival, therefore having applications in steerable digital beamformers. Fan filters are designed using the WDF realization, which has superior sensitivity and stability properties since it is derived from the original passive continuousdomain prototype LC ladder network with impedance-matched resistive terminations. The orientation of the fan filter, which is determined by the look-direction of the radio beam, can be altered by the WDF coefficients. Custom computing parallel digital architectures are proposed for fast real-time updating of WDF coefficients as a function of beam angle and beam size. These coefficients are computed using algebraic approximation methods resulting in fast digital circuits. Digital designs are implemented on Xilinx Virtex-6 XC6VLX240T FPGA device and tested using on-chip hardware co-simulation. The designs are also synthesized, placed and routed for 45 nm standard cell ASIC technology using freePDK45 library to determine the area utilization, power consumption and the maximum speed of operation.

Section: Computational Complexitymentioning

confidence: 99%

Fast FPGA-architecture for fan/beam-steering in wave-digital RF aperture arrays

Wijayaratna

Rajapaksha

Multidim Syst Sign Process

et al. 2016

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“…MD planar-resonant IIR filters have been proposed in addition to conventional phased/timed array-based aperture beamformers [6]- [9]. Three-dimensional IIR digital filters having conical shaped passbands in the 3-D spatio-temporal frequency domain have been proposed in [6], [8] for broadband beamforming using planar array of sensors. In [8], 3-D IIR cone-filters were employed to produce array patterns with multiple electronically-steerable radio frequency (RF) beams with an order of magnitude lower multiplier complexity compared to state-of-the-art digital phased arrays.…”

Section: A Antenna Array 2-d/3-d Signal Processingmentioning

confidence: 99%

Recent advances in multidimensional systems and signal processing: An overview

2015 IEEE International Symposium on Circuits and Systems (ISCAS)

Wijenayake

Lin

et al. 2015

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In this paper, we present an overview of recent advances in multidimensional (MD) systems and signal processing. We focus on topics closely related to the four papers selected into the special session of "recent advances in multidimensional systems and signal processing" at ISCAS 2015. The paper starts with an overview of the theory of MD IIR digital filters and its applications ranging from image/videos of light-fields to microwave and mm-wave antenna array processing. State-space formulation for the realization of MD IIR notch filters is also discussed as applicable to image processing scenarios. Thereafter, new developments in visual tomography-based imaging systems that exploit MD signal processing towards safety and health applications are discussed. The paper also reviews new theoretical developments in modeling of physical systems. Recent advances in MD Kirchhoff circuit realizations for some physical systems including finite speed heat diffusion are reviewed.

“…Frequency 2 planar filters have planar passbands in ω, and by cascading, the frequency planar passbands intersect, thereby form a beamshaped filter passband [9]. A beam-shaped passband in ω in turn produces a beam in the array pattern in (x, y, z) ∈ R 3 [10].…”

Section: Single Hexagonal Broadside Beam Filtermentioning

confidence: 99%

Hexagonal multi-beam analog RF aperture array

Wijenayake

2014 IEEE International Symposium on Circuits and Systems (ISCAS)

Bruton

2014

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A spatially discrete temporally continuous antenna array analog signal processing scheme that can produce highly selective hexagonal beams is proposed. A three dimensional (3-D) infinite impulse response (IIR) filter transfer function having hexagonal beam shaped passabands in the 3-D space-time frequency domain ω is introduced. A hexagonal beam passband in ω produces a hexagonal radio beam in the array pattern, and having closely packed multiple hexagonal beams, one can optimally sense a given sky area in a typical radar/microwave imaging application. The proposed array processing scheme employs analog RF circuits for achieving scaling, summing and time delay as building blocks for the signal processing operation. The 3-D IIR filter transfer function is derived by considering an example 10th-order 1-D Butterworth prototype polynomial.