Design and FPGA Implementation of Reconfigurable Linear-Phase Digital Filter With Wide Cutoff Frequency Range and Narrow Transition Bandwidth

Dhabu, Sumedh; Vinod, A. P.

doi:10.1109/tcsii.2015.2483418

Cited by 12 publications

(3 citation statements)

References 16 publications

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“…In the literature, it is noted that various digital filters [8][9][10][11][12][13][14][15][16] are designed with variable cut-off frequency. These filters are tuneable [9,10,17] with variable coefficient methodology or fixed coefficient with decimation [9].…”

Section: Necessity Of a Variable Data Rate Transmissionmentioning

confidence: 99%

Dynamically tuneable pre‐modulation filter for an airborne PCM/FM telemetry system

Karnati

Bopanna

Jahagirdar

2021

IET Circuits, Devices & Systems

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In the conventional airborne telemetry system, the pre-modulation filter with a multipole active Bessel filter is preferred to use in Pulse Code Modulator (PCM)/FM transmission. In the existing system, it is not possible to change the cutoff frequency for different data rates dynamically as required in the launch scenario of a long-range aerospace vehicle. In general, aerospace vehicle has multiple propellant stages to travel a desired trajectory path. Each stage gets separated from the vehicle at different instances. Each stage measurement plan is defined and correspondingly the PCM format is generated with an optimum data rate. Hence, the telemetry system is required to transmit variable data rates at various instances of a long-range aerospace vehicle from launch point to end point of a vehicle. This can be addressed by designing a dynamically tuneable pre-modulation (DTPM) filter. Here, a suitable DTPM filter scheme is proposed to mitigate variable data rate transmission in the telemetry system. The scheme is analysed as per IRIG-106 standard and simulated using MATLAB. The same has been modelled using VHDL and implemented targeting 28 nm technology Xilinx Zynq FPGA device. How to cite this article: Karnati SR, Bopanna L, Jahagirdar DR. Dynamically tuneable pre-modulation filter for an airborne PCM/FM telemetry system. IET

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Section: Necessity Of a Variable Data Rate Transmissionmentioning

confidence: 99%

Dynamically tuneable pre‐modulation filter for an airborne PCM/FM telemetry system

Karnati

Bopanna

Jahagirdar

2021

IET Circuits, Devices & Systems

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“…An interpolated SPA (ISPA) based filter was proposed in [54] to extend the cutoff frequency range of the SPA based filters to entire Nyquist band, by integrating SPA and interpolation techniques. This method overcomes all the limitations of all the previously existing SPA based filters [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53] and provides very wide cutoff frequency range and narrow transition bandwidth along with small passband ripple and high stopband attenuation.…”

Section: Sub-filter L+1mentioning

confidence: 99%

“…Detailed architectures of these VCF filters are available in [52][53][54]. For all these filters, it is possible to obtain variable lowpass, highpass, bandpass, and bandstop responses without any hardware re-implementation.…”

Section: Sub-filter L+1mentioning

confidence: 99%

Variable cutoff frequency FIR filters: a survey

et al. 2020

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Many signal processing applications require digital filters with variable frequency characteristics, especially the filters with variable bandwidth. Due to their linear phase and inherent stability, variable bandwidth finite impulse response (FIR) filters are the popular choice in majority of the applications. Once a variable cutoff frequency (VCF) FIR lowpass filter is designed, variable bandwidth bandpass / highpass / bandstop filters and reconfigurable filter banks can be realized from the same. In this paper, we present a comprehensive review of the existing variable cutoff frequency FIR filter design techniques, including the developments in the recent two decades. We provide the basic concepts, design and architectural details for each of these techniques and the major developments / incremental works thereof. Qualitative as well as quantitative comparisons are provided to assist the reader in choosing the most suitable VCF filter design technique for a particular application. Keywords FIR filters, reconfigurable filters, variable digital filters IntroductionCompared to analog filters, digital filters have advantage of higher accuracy, exact linear-phase (if desired), time-invariant performance (analog filter performance changes due to component drift), relatively smaller silicon area etc. These advantages, coupled with the advent of VLSI technology, have resulted in ubiquitous presence of digital filters in almost all the signal processing applications with a few exceptions (such as wideband filtering in radio frequency range, which is not feasible due to the bottleneck at the speed of analog-to-digital converters).Digital filters with variable frequency response characteristics are required for numerous critical applications in the fields of digital communications, audio signal processing, biomedical signal processing etc. [1,2]. In digital communications domain alone, digital filters with variable frequency response characteristics can be used for spectrum analysis, spectrum shaping, channelization, and receiver synchronization. For e.g., a digital filter having tuneable passband and transition bandwidths is used for channel extraction in a multi-standard wireless communication receiver, as it needs to be interoperable with multiple communication standards having distinct bandwidth specifications. Alternatively, a digital modem uses a digital filter to implement variable fractional delays. In general, a digital filter whose frequency response can be changed on-the-fly is called a variable digital filter. Even though such a definition means that all the parameters related to the frequency response should be variable, in practice, majority of the applications demand only a lowpass filter with variable cutoff frequency (fc), satisfying the desired minimum specifications of transition bandwidth (tbw), passband ripple (δp) and stopband ripple (δs). Therefore, the VCF (variable cutoff frequency) filter design task can be simplified further, by specifying the maximum limit on tbw, δp, and δs, and thus, only one...

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A Study on the Optimum Selection of Interpolation Factor for the Design of Narrow Transition Band FIR Filter Using IBM

Roy

Chandra

2021

Computers and Devices for Communication

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Design and FPGA Implementation of Reconfigurable Linear-Phase Digital Filter With Wide Cutoff Frequency Range and Narrow Transition Bandwidth

Cited by 12 publications

References 16 publications

Dynamically tuneable pre‐modulation filter for an airborne PCM/FM telemetry system

Dynamically tuneable pre‐modulation filter for an airborne PCM/FM telemetry system

Variable cutoff frequency FIR filters: a survey

A Study on the Optimum Selection of Interpolation Factor for the Design of Narrow Transition Band FIR Filter Using IBM

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