A novel pulse compression technique for side-lobe reduction using woo filter concepts

Thakur, Ankur; Talluri, Salman Raju

doi:10.1109/iccsp.2017.8286543

Cited by 11 publications

(2 citation statements)

References 15 publications

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“…Crosstalk caused by the side lobes of the compressed pulse needs to be reduced by increasing the side lobe suppression ratio [30]. Due to the narrow main lobe width and low side lobe suppression ratio of the linear frequency modulation (LFM) signal, the windowing method in the time domain is usually used to improve the side lobe suppression ratio of the LFM signal [31,32].…”

Section: Principle and Theoretical Analysismentioning

confidence: 99%

A Phase-Sensitive Optical Time Domain Reflectometry with Non-Uniform Frequency Multiplexed NLFM Pulse

Li,

Zhang,

Yuan

et al. 2023

Sensors

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In the domain of optical fiber distributed acoustic sensing, the persistent challenge of extending sensing distances while concurrently improving spatial resolution and frequency response range has been a complex endeavor. The amalgamation of pulse compression and frequency division multiplexing methodologies has provided certain advantages. Nevertheless, this approach is accompanied by the drawback of significant bandwidth utilization and amplified hardware investments. This study introduces an innovative distributed optical fiber acoustic sensing system aimed at optimizing the efficient utilization of spectral resources by combining compressed pulses and frequency division multiplexing. The system continuously injects non-linear frequency modulation detection pulses spanning various frequency ranges. The incorporation of non-uniform frequency division multiplexing augments the vibration frequency response spectrum. Additionally, nonlinear frequency modulation adeptly reduces crosstalk and enhances sidelobe suppression, all while maintaining a favorable signal-to-noise ratio. Consequently, this methodology substantially advances the spatial resolution of the sensing system. Experimental validation encompassed the multiplexing of eight frequencies within a 120 MHz bandwidth. The results illustrate a spatial resolution of approximately 5 m and an expanded frequency response range extending from 1 to 20 kHz across a 16.3 km optical fiber. This achievement not only enhances spectral resource utilization but also reduces hardware costs, making the system even more suitable for practical engineering applications.

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Section: Principle and Theoretical Analysismentioning

confidence: 99%

A Phase-Sensitive Optical Time Domain Reflectometry with Non-Uniform Frequency Multiplexed NLFM Pulse

Li,

Zhang,

Yuan

et al. 2023

Sensors

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show abstract

“…It employed a weighted cost function in finding the optimal positions of the array elements, which improved its performance compared to the non-weighted cost function-based techniques. Another SLL reduction technique based on pulse compression (PC) using a WOO filter was introduced in [7]. This method showed a significant improvement in integrated SLL (ISL) and peak SLL compared with other PC techniques.…”

Section: Introductionmentioning

confidence: 99%

New Antenna Array Beamforming Techniques Based on Hybrid Convolution/Genetic Algorithm for 5G and Beyond Communications

Amer,

Khalaf,

Hussein

et al. 2024

CMES

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Side lobe level reduction (SLL) of antenna arrays significantly enhances the signal-to-interference ratio and improves the quality of service (QOS) in recent and future wireless communication systems starting from 5G up to 7G. Furthermore, it improves the array gain and directivity, increasing the detection range and angular resolution of radar systems. This study proposes two highly efficient SLL reduction techniques. These techniques are based on the hybridization between either the single convolution or the double convolution algorithms and the genetic algorithm (GA) to develop the Conv/GA and DConv/GA, respectively. The convolution process determines the element's excitations while the GA optimizes the element spacing. For M elements linear antenna array (LAA), the convolution of the excitation coefficients vector by itself provides a new vector of excitations of length N = (2M −1). This new vector is divided into three different sets of excitations including the odd excitations, even excitations, and middle excitations of lengths M, M − 1, and M, respectively. When the same element spacing as the original LAA is used, it is noticed that the odd and even excitations provide a much lower SLL than that of the LAA but with a much wider half-power beamwidth (HPBW). While the middle excitations give the same HPBW as the original LAA with a relatively higher SLL. To mitigate the increased HPBW of the odd and even excitations, the element spacing is optimized using the GA. Thereby, the synthesized arrays have the same HPBW as the original LAA with a two-fold reduction in the SLL. Furthermore, for extreme SLL reduction, the DConv/GA is introduced. In this technique, the same procedure of the aforementioned Conv/GA technique is performed on the resultant even and odd excitation vectors. It provides a relatively wider HPBW than the original LAA with about quad-fold reduction in the SLL. KEYWORDSArray synthesis; convolution process; genetic algorithm (GA); half power beamwidth (HPBW); linear antenna array (LAA); side lobe level (SLL); quality of service (QOS)

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A Universal Formula for Side-Lobes Removal Optimum Filter in Multi-samples Phase Coded Pulse Compression Radars

Metwally

Elbardawiny

Ahmed

et al. 2019

Advances in Intelligent Systems and Computing

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A novel pulse compression technique for side-lobe reduction using woo filter concepts

Cited by 11 publications

References 15 publications

A Phase-Sensitive Optical Time Domain Reflectometry with Non-Uniform Frequency Multiplexed NLFM Pulse

A Phase-Sensitive Optical Time Domain Reflectometry with Non-Uniform Frequency Multiplexed NLFM Pulse

New Antenna Array Beamforming Techniques Based on Hybrid Convolution/Genetic Algorithm for 5G and Beyond Communications

A Universal Formula for Side-Lobes Removal Optimum Filter in Multi-samples Phase Coded Pulse Compression Radars

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