Area and power efficient mismatched filters based on sidelobe inversion

Fam, Adly T.; Sarkar, Indranil; Poonnen, Thomas

doi:10.1109/radar.2008.4720949

Cited by 9 publications

(2 citation statements)

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“…One of the widely used approaches to suppress the ACF sidelobes of a waveform/code is via windowing whereby the peak sidelobe level is reduced, but at the cost of increasing the mainlobe width. Mismatched filters like the ones introduced in [5][6][7][8] could also be used to reduce ACF sidelobes at the cost of a small loss in signal-to-noise ratio. In [9], it is shown that complete sidelobe cancellation for a class of aperiodic codes is possible using additive-multiplicative processing of the matched filter (MF) output.…”

Section: 𝑅[𝑛]mentioning

confidence: 99%

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Good Code Sets from Complementary Pairs via Discrete Frequency Chips

Kadlimatti

Fam

2017

Aerospace

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It is shown that replacing the sinusoidal chip in Golay complementary code pairs by special classes of waveforms that satisfy two conditions, symmetry/anti-symmetry and quazi-orthogonality in the convolution sense, renders the complementary codes immune to frequency selective fading and also allows for concatenating them in time using one frequency band/channel. This results in a zero-sidelobe region around the mainlobe and an adjacent region of small cross-correlation sidelobes. The symmetry/anti-symmetry property results in the zero-sidelobe region on either side of the mainlobe, while quasi-orthogonality of the two chips keeps the adjacent region of cross-correlations small. Such codes are constructed using discrete frequency-coding waveforms (DFCW) based on linear frequency modulation (LFM) and piecewise LFM (PLFM) waveforms as chips for the complementary code pair, as they satisfy both the symmetry/anti-symmetry and quasi-orthogonality conditions. It is also shown that changing the slopes/chirp rates of the DFCW waveforms (based on LFM and PLFM waveforms) used as chips with the same complementary code pair results in good code sets with a zero-sidelobe region. It is also shown that a second good code set with a zero-sidelobe region could be constructed from the mates of the complementary code pair, while using the same DFCW waveforms as their chips. The cross-correlation between the two sets is shown to contain a zero-sidelobe region and an adjacent region of small cross-correlation sidelobes. Thus, the two sets are quasi-orthogonal and could be combined to form a good code set with twice the number of codes without affecting their cross-correlation properties. Or a better good code set with the same number codes could be constructed by choosing the best candidates form the two sets. Such code sets find utility in multiple input-multiple output (MIMO) radar applications.

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Section: 𝑅[𝑛]mentioning

confidence: 99%

“…Mismatched filters like the ones introduced in [5][6][7][8] could also be used to reduce ACF sidelobes at the cost of a small loss in signal-to-noise ratio. In [9], it is shown that complete sidelobe cancellation for a class of aperiodic codes is possible using additive-multiplicative processing of the matched filter (MF) output.…”

Section: Introductionmentioning

confidence: 99%