A novel filter design for spatially interpolated beamformer

Gudino, Lucy J.; N., Jagadeesha S.; Rodrigues, Joseph

doi:10.1109/ispacs.2009.4806682

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…The transfer function of the ModFRM filter can be expressed as [23]: (5) where H a,q (z L ) is the q th DFT modulated prototype filter interpolated by L. Equation ( 5) can be rewritten as: (6) where, Both the even BES-FB or odd BES-FB can be used to determine the frequency response of the ModFRM filter around the transition band. Accordingly, the masking filter design may be done in two ways as follows [23]:…”

Section: Modified Frm Structurementioning

confidence: 99%

“…Among the various techniques, array beamformer synthesis is closely associated with the design of digital finite-impulse-response (FIR) filters, in which the tapped delay line is transformed by spatial delay, and the filter length is proportional to the number of antennas. The Uniform Linear Array (ULA) is the most widely used array geometry because of its simplicity, superior directivity, and realization of the narrow beamwidth in a given direction [5,6]. In the ULA beamformer, the spatially sampled sequences from each sensor are linearly combined in the same way the temporally sampled data are linearly combined by an FIR filter [7].…”

Section: Introductionmentioning

confidence: 99%

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Design of Sparse Uniform Linear Array Beamformer using Modified FRM Structure for Varied Applications

Kandy

Sakthivel

2022

Int. j. electr. comput. eng. syst. (Online)

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This paper presents a method to generate antenna patterns for a Uniform Linear Array (ULA) having narrow beamwidth and low sidelobe levels (SLL) using the recently proposed Modified FRM (ModFRM) architecture. This allows it to direct the beams to specific ground cells for communications while mitigating inter-cell interference. The sharpness of the beam pattern defines the spatial discriminating performance of a ULA beamformer, while the SLL dictates the interference and noise suppression capabilities. Typically, a conventional ULA beamforming will demand high computational complexity and a large number of sensors to satisfy these requirements. Hence to reduce the system cost, using the ModFRM technique a sparse array is developed. With this strategy, the total number of sensors is drastically reduced compared to conventional ULA beamformers. The designed beamformers can be used in applications with stringent requirements where cost and size are concerned.

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Section: Modified Frm Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of Sparse Uniform Linear Array Beamformer using Modified FRM Structure for Varied Applications

Kandy

Sakthivel

2022

Int. j. electr. comput. eng. syst. (Online)

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“…Spatial filters also extensively use FIR filters in antenna array beamforming to obtain a highly directive beam (L.J.Gudino et al, 2008; L.J. Gudino et al, 2009) .The designed pulses have higher flexibility and FCC spectral mask compliance attained employing the Parks-McClellan algorithm (E. Baccarelli et al, 2008) . However, since the length of the filter and therefore the pulse length is very large, this can lead to overlapping pulses, increased energy consumption, interference and therefore the proposed method is not an optimal solution.…”

Section: Review Of Uwb Pulse Shaping Techniquesmentioning

confidence: 99%

Spectral Efficient Pulse Shaping for Impulse Radio Ultra Wideband Communications

M.K¹,

Rodrigues²,

Lonappan³

et al. 2020

helix

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Efficient pulse shaping techniques are required in UWB communication systems to fit the Federal Communication Commission (FCC) mask with reduced interference with other narrow band systems. We propose a pulse shaping technique to fit the FCC mask efficiently by employing our proposed band pass filter. The UWB pulse shape is spectrally modified and analyzed to prove its ability in achieving higher spectral utilization efficiency without employing any optimization techniques as in literature. The proposed band pass filter for pulse shaping has features of sharp transition, desired stop band attenuation and expression for filter coefficients which enables flexible spectral shaping to fit any FCC mask efficiently.

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“…Decimators are used in multirate systems to generate signals with lower data rates. Examples where decimators are an essential component include finite impulse response (FIR) filters with steep transition band [3, 4], nested arrays broadband beamformers [5, 6], the baseband DSP of software‐defined radio (SDR) to enable configurable sample rates [7], the digital down converter of a fourth‐generation receiver systems [8], the digitally enhanced high‐speed analogue‐to‐digital converter for achieving higher signal‐to‐noise ratio in wireless and SDR applications [9, 10], the quadrature mirror filter for equalising wireless communications channels [11], and discrete Fourier transform (DFT) filter bank beamformers [12]. Decimators can also be found in other general areas such as radar [13–16], communications [17], speech [18, 19], and image processing [20, 21].…”

Section: Introduction and Related Workmentioning

confidence: 99%

Decimator systolic arrays design space exploration for multirate signal processing applications

Shoukry

Gebali

Agathoklis

2019

IET Circuits, Devices & Systems

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This study presents a new systolic array structure for a decimator that merges the antialiasing finite impulse response (FIR) filter with the downsampler. The development of the structure is based on a systematic methodology. Using this methodology, a dependence graph for the decimator was obtained that combined the antialiasing filter and the downsampler. Different data scheduling and projection operations were developed to obtain different proposed designs. Six systolic array design options were obtained and evaluated. The fastest design was selected for hardware implementation and compared with the other two well known decimator designs; namely, conventional design, in which the antialiasing filter is followed by a downsampling and the polyphase design, in which a commutator is followed by the polyphase antialiasing filter. Fieldprogrammable gate array implementations for the proposed and the other two designs confirm that the proposed decimator implementation outperforms in terms of area, speed, and power as the decimation factor increases regardless of the number of FIR filter coefficients.

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A novel filter design for spatially interpolated beamformer

Cited by 7 publications

References 6 publications

Design of Sparse Uniform Linear Array Beamformer using Modified FRM Structure for Varied Applications

Design of Sparse Uniform Linear Array Beamformer using Modified FRM Structure for Varied Applications

Spectral Efficient Pulse Shaping for Impulse Radio Ultra Wideband Communications

Decimator systolic arrays design space exploration for multirate signal processing applications

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