Academic literature on the topic 'Scale Free CORDIC'

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Journal articles on the topic "Scale Free CORDIC"

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Aggarwal, Supriya, and Kavita Khare. "Redesigned-Scale-Free CORDIC Algorithm Based FPGA Implementation of Window Functions to Minimize Area and Latency." International Journal of Reconfigurable Computing 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/185784.

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One of the most important steps in spectral analysis is filtering, where window functions are generally used to design filters. In this paper, we modify the existing architecture for realizing the window functions using CORDIC processor. Firstly, we modify the conventional CORDIC algorithm to reduce its latency and area. The proposed CORDIC algorithm is completely scale-free for the range of convergence that spans the entire coordinate space. Secondly, we realize the window functions using a single CORDIC processor as against two serially connected CORDIC processors in existing technique, thus optimizing it for area and latency. The linear CORDIC processor is replaced by a shift-add network which drastically reduces the number of pipelining stages required in the existing design. The proposed design on an average requires approximately 64% less pipeline stages and saves up to 44.2% area. Currently, the processor is designed to implement Blackman windowing architecture, which with slight modifications can be extended to other widow functions as well. The details of the proposed architecture are discussed in the paper.
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Anita, Jain1 and Kavita Khare2. "HARDWARE EFFICIENT SCALING FREE VECTORING AND ROTATIONAL CORDIC FOR DSP APPLICATIONS." International Journal of VLSI design & Communication Systems (VLSICS) Vol.4, No.3, June 2013 4, no. 3 (2019): 01–08. https://doi.org/10.5281/zenodo.3251696.

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The COordinate Rotation DIgital Computer CORDIC algorithm has proved its versatility in computing various transcendental functions by only using the shift and adds operations. This paper presents a new hardware efficient scaling free CORDIC algorithm to operate in vectoring and in rotation mode. The micro rotation of the vector is always in one direction with no scale factor correction. The Range of Convergence RoC is from 0 to 2π. No pre and post processing circuitry is required. 16 bit Scaling free CORDIC Pipelined architecture based on the proposed algorithm is synthesized on FPGA Xilinx VirtexII P device coded in Verilog. Synthesized results show totally scaling free performance with very small dynamic power consumption of .06 mW and maximum delay of 4.123 ns and 9.925 ns in the rotational and vectoring modes respectively. The minimum BEP of the proposed algorithm implementation is 12. Proposed algorithm is faster and efficient in terms of area and accuracy as compared to conventional CORDIC.
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Raguram, M., and R. Parameshwaran. "A modified scale free CORDIC architecture to improve the speed." Contemporary Engineering Sciences 7 (2014): 435–41. http://dx.doi.org/10.12988/ces.2014.4327.

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Aggarwal, Supriya, Pramod Kumar Meher, and Kavita Khare. "Scale-Free Hyperbolic CORDIC Processor and Its Application to Waveform Generation." IEEE Transactions on Circuits and Systems I: Regular Papers 60, no. 2 (2013): 314–26. http://dx.doi.org/10.1109/tcsi.2012.2215778.

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Zhang, Chaohong, Xingguang Geng, Fei Yao, et al. "The Ultrasound Signal Processing Based on High-Performance CORDIC Algorithm and Radial Artery Imaging Implementation." Applied Sciences 13, no. 9 (2023): 5664. http://dx.doi.org/10.3390/app13095664.

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The radial artery reflects the largest amount of physiological and pathological information about the human body. However, ultrasound signal processing involves a large number of complex functions, and traditional digital signal processing can hardly meet the requirements of real-time processing of ultrasound data. The research aims to improve computational accuracy and reduce the hardware complexity of ultrasound signal processing systems. Firstly, this paper proposes to apply the coordinate rotation digital computer (CORDIC) algorithm to the whole radial artery ultrasound signal processing, combines the signal processing characteristics of each sub-module, and designs the dynamic filtering module based on the radix-4 CORDIC algorithm, the quadrature demodulation module based on the partitioned-hybrid CORDIC algorithm, and the dynamic range transformation module based on the improved scale-free CORDIC algorithm. A digital radial artery ultrasound imaging system was then built to verify the accuracy of the three sub-modules. The simulation results show that the use of the high-performance CORDIC algorithm can improve the accuracy of data processing. This provides a new idea for the real-time processing of ultrasound signals. Finally, radial artery ultrasound data were collected from 20 volunteers using different probe scanning modes at three reference positions. The vessel diameter measurements were averaged to verify the reliability of the CORDIC algorithm for radial artery ultrasound imaging, which has practical application value for computer-aided clinical diagnosis.
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Nawandar, Neha K., and Vishal R. Satpute. "Energy Efficient Quality Tunable CORDIC for DSP Applications on Battery Operated Portable Devices." Journal of Circuits, Systems and Computers 27, no. 04 (2017): 1850051. http://dx.doi.org/10.1142/s0218126618500512.

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COrdinate Rotation DIgital Computer (CORDIC) is commonly utilized for the computation of cosine/sine i.e., the trigonometric functions, singular value decomposition, in digital signal processing (especially in image/video processing), etc. This paper introduces an energy efficient quality tunable CORDIC architecture that computes the cosine/sine values of any required angle in real-time, and is thus well suited for real time DSP applications, especially for image or video processing applications. The proposed architecture reduces the latency and overcomes data dependency by simultaneously performing all the five iterations, that may vary depending upon the desired energy efficiency. The novelty of this architecture is that, desired quality can be achieved by selecting one out of the available three modes. In order to assess the efficacy of the suggested architecture, some benchmark images are processed using the Discrete Cosine Transform (DCT) coefficients obtained via the proposed design. Energy saving is achieved at the cost of slight acceptable degradation in the output image quality. Further, the simulation results show that the proposed architecture is 92.3%, 2.8% and 49.08% more energy efficient than the existing basic, scale-free and lookahead CORDIC architectures, respectively.
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Vettorello, Itauana, Daniele Michelin Paganotte, Adilson Sartorato, et al. "Analgesic Efficacy of Cordia Verbenacea-based Gel in the Reduction of Pain Associated with Use of Separator Elastics/ Eficácia Analgésica do Gel à base de Cordia Verbenacea na Redução de Tinta Associada ao Uso de Elásticos Separadores." Brazilian Journal of Development 7, no. 6 (2021): 63855–68. http://dx.doi.org/10.34117/bjdv7n6-661.

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Introduction: In Orthodontics separator elastics are used to create space for inserting the bands. This causes pain. Phytotherapy has been promising as a therapy. Objective. This double blind randomized clinical trial evaluated the level of pain due to the use of elastic separator (SE) after intraoral topical administration of Cordia verbenacea gel (CV). Methods. 50 volunteers received the SE on the mesial and distal surfaces of the maxillary first molars. In a blinded manner, 0.5 g of the gel was used in one hemi-arch, and placebo in the other hemi-arch on the free gingival margin of the first molar, every 8 hours, for 3 days. Pain was measured on a visual analog scale (VAS), before insertion of the SE (t0), immediately after (t1) and every hour after the following applications. Sensory analysis of the was performed for effects of taste and burning. Wilcoxon (comparison between sides) and Friedman and Nemenyi tests were performed for comparisons between times (α=0.05). Results. The pain was lower on the side that received the phytotherapeutic gel, from the first application until before the removal of the elastic (p 0.05). As regards the burning sensation, the experimental side had higher scores and 20% of the subjects considered the CV gel had an unpleasant taste. It was concluded that the use of the intrabucal topic of CV has an analgesic potential for pain resulting from the insertion of SE.
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Mutter, Robert, Tina Hieken, Todd DeWees, et al. "Abstract PD7-03: Ultra-accelerated photon, proton, and brachytherapy partial breast irradiation: Primary results of the Mayo 3-fraction trial." Cancer Research 82, no. 4_Supplement (2022): PD7–03—PD7–03. http://dx.doi.org/10.1158/1538-7445.sabcs21-pd7-03.

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Abstract Background: Partial breast irradiation (PBI) is an established option for selected patients with early stage breast cancer. The optimal technique, target volume and dose/fractionation for PBI has yet to be defined. The most studied regimen in North America (38.5 Gy in 10 fractions twice daily) has been associated with cosmetic deterioration. We hypothesized that condensing treatment and reducing the total administered dose could improve the therapeutic ratio in luminal breast cancer and DCIS based on emerging evidence that breast cancer is more sensitive than surrounding normal tissues to high dose fractions. Herein, we report cosmetic, tolerability, disease control, and patient reported outcomes of a novel ultra-accelerated PBI regimen. Methods: We conducted a single arm, three cohort trial of photon, proton, and brachytherapy PBI. Technique was selected at physician and patient discretion. Eligible women were age ≥ 50 years with estrogen receptor positive (ER+), sentinel lymph node negative invasive or in-situ breast cancer measuring ≤ 2.5 cm. The regimen was designed to have comparable biologically equivalent effect as 40 Gy in 15 fractions, assuming an α/β ratio of 3.5. Intracavitary brachytherapy target volume was lumpectomy cavity plus 1 cm and prescribed 21 Gy in 3 fractions. Photon and proton target volumes were post-operative tumor bed plus 1 cm and a 3 mm setup uncertainty margin, prescribed 21.9 Gy (RBE) in 3 fractions, and delivered with image guidance. The primary outcome was the percentage difference in patients with adverse cosmesis (defined as fair or poor cosmesis) at 3 years compared to baseline pre-PBI, as assessed by trained nurses using the 4-point Harvard breast cosmesis scale. Patients also completed quality of life surveys and self-reported cosmesis using the 4-point scale. Locoregional and distant recurrence-free survival was determined using the Kaplan-Meier method. Adverse events were assessed using CTCAE, v 4.0. Results: Between 2015 and 2017, 163 patients were treated: photons in 58, protons in 48, and brachytherapy in 57. Median patient age was 66 years. 129 (79%) patients had invasive breast cancer (all ER+) and 34 (21%) had DCIS (83% ER+). Median tumor size was 1.1 cm. Grade was 2-3 in 102 (63%). The median mean heart/ipsilateral lung doses were photons 0.1/1.6 Gy, protons <0.001/0.1 Gy, and brachytherapy 0.5/0.9 Gy. Median follow-up was 4.1 years (IQR 3.9-5.0). The proportion of patients with adverse cosmesis (by RN assessment) was 14.3% at baseline and 3.8% at 3 years, with four patients (1 photon, 1 proton, 2 brachytherapy) experiencing cosmetic deterioration at 3 years from baseline. The proportion with adverse cosmesis by self-report at 3 years was 2.4%, with three patients (1 photon, 1 proton, 1 brachytherapy) reporting cosmetic deterioration. Four patients developed locoregional recurrence (1 photons, 2 protons, 1 brachytherapy); three were local only and one was local and distant. 4-year locoregional recurrence and distant metastasis-free survival were 97.9% and 97.4%, respectively. There were 2 treatment related ≥ grade 2 late events (grade 2 fibrosis and grade 2 seroma, both brachytherapy associated), and no evidence of deterioration in patient-reported pain, fatigue, breast related or overall quality of life, as assessed by the patient reported outcomes version of the CTCAE, 10-point linear analog scales, and the breast cancer treatment outcomes scale. Conclusions: Ultra-accelerated 3-fraction PBI exquisitely spared normal tissues and was associated with favorable cosmetic outcomes, disease control, and excellent long-term tolerability. This ‘precision-radiotherapy’ approach may optimize the therapeutic ratio over more aggressive radiotherapy options as well as radiotherapy omission, particularly in patients with long life expectancies. Citation Format: Robert Mutter, Tina Hieken, Todd DeWees, Arslan Afzal, Stephanie Kenison, Laura Vallow, Christopher Deufel, Nicholas Remmes, Kathryn Ruddy, Judy Boughey, Keith Furutani, Amy Degnim, James Jakub, Tamara Vern-Gross, Dean Shumway, William Wong, Samir Patel, Lisa McGee, Minetta Liu, Carlos Vargas, Daniel Visscher, Bradley Stish, Deanna Pafundi, Mark Waddle, Michael Golafshar, Michele Halyard, Kimberly Corbin, Sean Park. Ultra-accelerated photon, proton, and brachytherapy partial breast irradiation: Primary results of the Mayo 3-fraction trial [abstract]. In: Proceedings of the 2021 San Antonio Breast Cancer Symposium; 2021 Dec 7-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2022;82(4 Suppl):Abstract nr PD7-03.
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Changela, Ankur, Yogesh Kumar, Marcin Woźniak, Jana Shafi, and Muhammad Fazal Ijaz. "Radix-4 CORDIC algorithm based low-latency and hardware efficient VLSI architecture for Nth root and Nth power computations." Scientific Reports 13, no. 1 (2023). http://dx.doi.org/10.1038/s41598-023-47890-3.

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AbstractIn this article, a low-complexity VLSI architecture based on a radix-4 hyperbolic COordinate Rotion DIgital Computer (CORDIC) is proposed to compute the $$N{{\rm th}}$$ N th root and $$N{{\rm th}}$$ N th power of a fixed-point number. The most recent techniques use the radix-2 CORDIC algorithm to compute the root and power. The high computation latency of radix-2 CORDIC is the primary concern for the designers. $$N{{\rm th}}$$ N th root and $$N{{\rm th}}$$ N th power computations are divided into three phases, and each phase is performed by a different class of the proposed modified radix-4 CORDIC algorithms in the proposed architecture. Although radix-4 CORDIC can converge faster with fewer recurrences, it demands more hardware resources and computational steps due to its intricate angle selection logic and variable scale factor. We have employed the modified radix-4 hyperbolic vectoring (R4HV) CORDIC to compute logarithms, radix-4 linear vectoring (R4LV) to perform division, and the modified scaling-free radix-4 hyperbolic rotation (R4HR) CORDIC to compute exponential. The criteria to select the amount of rotation in R4HV CORDIC is complicated and depends on the coordinates $$X^j$$ X j and $$Y^j$$ Y j of the rotating vector. In the proposed modified R4HV CORDIC, we have derived the simple selection criteria based on the fact that the inputs to R4HV CORDIC are related. The proposed criteria only depend on the coordinate $$Y^j$$ Y j that reduces the hardware complexity of the R4HV CORDIC. The R4HR CORDIC shows the complex scale factor, and compensation of such scale factor necessitates the complex hardware. The complexity of R4HR CORDIC is reduced by pre-computing the scale factor for initial iterations and by employing scaling-free rotations for later iterations. Quantitative hardware analysis suggests better hardware utilization than the recent approaches. The proposed architecture is implemented on a Virtex-6 FPGA, and FPGA implementation demonstrates $$19\%$$ 19 % less hardware utilization with better error performance than the approach with the radix-2 CORDIC algorithm.
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Meher, Pramod Kumar, and Supriya Aggarwal. "Efficient Design and Implementation of Scale-Free CORDIC With Mutually Exclusive Micro-Rotations." IEEE Transactions on Circuits and Systems I: Regular Papers, 2025, 1–9. https://doi.org/10.1109/tcsi.2025.3549974.

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Book chapters on the topic "Scale Free CORDIC"

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Rai, Shalini, and Rajeev Srivastava. "FPGA Realization of Scale-Free CORDIC Algorithm-Based Window Functions." In Lecture Notes in Electrical Engineering. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2685-1_24.

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Conference papers on the topic "Scale Free CORDIC"

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Prasad, N., Ayas Kanta Swain, and K. K. Mahapatra. "Design and error analysis of a scale free CORDIC unit with corrected scale factor." In 2012 Asia Pacific Conference on Postgraduate Research in Microelectronics & Electronics (PRIMEASIA). IEEE, 2012. http://dx.doi.org/10.1109/primeasia.2012.6458618.

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Hoang, Trong-Thuc, Hong-Thu Nguyen, Xuan-Thuan Nguyen, Cong-Kha Pham, and Duc-Hung Le. "High-performance DCT architecture based on angle recoding CORDIC and Scale-Free Factor." In 2016 IEEE Sixth International Conference on Communications and Electronics (ICCE). IEEE, 2016. http://dx.doi.org/10.1109/cce.2016.7562636.

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