FPGA implementation of a tunable band-pass filter using the "basic heterodyne block"

Sasidaran, D.; Azam, A.; Nelson, K.; Soderstrand, M.A.

doi:10.1109/icassp.2001.941110

Cited by 8 publications

(3 citation statements)

References 7 publications

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“…A series of tunable and Adaptive Heterodyne Filters (AHF's) have been proposed for use in narrow-band interference attenuation for spread-spectrum and other broad-band communications systems [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…The first category is the "Simple Heterodyne Filters" which are conceptually simple and easy to design, but require hardware-intensive image filters that are difficult to realize in practice except for some fairly simple band-pass and notch applications [1,8]. The second category is the "Basic Heterodyne Filters" which do not require the image filters, but are still limited to fairly simple band-pass and notch applications [2,7]. The third category is the "Full Tunable Heterodyne Filters" which require nearly double the hardware of the Basic Heterodyne Filters, but provide the maximum flexibility in tunable and adaptive filter design [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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A tunable band-pass filter using a complex-arithmetic heterodyne approach

Soderstrand

Cho

2009

2009 52nd IEEE International Midwest Symposium on Circuits and Systems

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Complex arithmetic allows the separation ofthe poles and zeros in the top half of the z-plane from the poles and zeros in the bottom half of the z-plane. Heterodyne techniques can then be used to move the poles and zeros in the top half of the plane counter-clockwise and the poles and zeros in the bottom half of the z-plane clockwise. For the case ofnarrow-band band-pass filters, a significant hardware savings can be obtained by using only the real part ofthe resulting output.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A tunable band-pass filter using a complex-arithmetic heterodyne approach

Soderstrand

Cho

2009

2009 52nd IEEE International Midwest Symposium on Circuits and Systems

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“…Recently the authors have introduced the concept of tunable heterodyne filters [15][16][17][18][19][20][21][22][23][24][25]. The most recent of these papers discuss the implementation of heterodyne filters that make use of a complex heterodyne signal to convert complicated fixed coefficient digital filters into tunable digital filters tunable by a single heterodyne frequency [25].…”

Section: Introductionmentioning

confidence: 99%

Residue Number System Implementations of Complex Heterodyne Tunable Filters

Soderstrand¹,

Cho²,

Johnson³

2005 IEEE International Symposium on Circuits and Systems

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The heterodyne signals for a complex heterodyne filter based upon M/2 equally-spaced heterodyne frequencies between DC and the Nyquist frequency can be generated from taking integer powers of the M th root of one. In Residue Number Systems (RNS) based on prime moduli of the form Mk+1, where k is an integer, the Mth root of one and its powers can be represented by integer values within the RNS. These M th -root Residue Number Systems (MRNS) are ideal for implementing complex heterodyne filters that allow for the tuning of digital filters between DC and the Nyquist frequency.Using MRNS exact arithmetic can be carried out on these complex signals with errors only occurring at the output when MRNS is converted to binary. The result is a tunable linear-phase filter that is convenient to implement and uses less hardware than conventional tunable filters.

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