GenConstraint: A programming tool for constraint optimization problems

Tsoulos, Ioannis G.; Stavrou, Vasileios P.; Mastorakis, N.E.; Tsalikakis, Dimitrios G.

doi:10.1016/j.softx.2019.100355

Cited by 15 publications

(12 citation statements)

References 18 publications

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“…A software was developed to overcome the constrained optimization challenges in Stavrou et al [17]. The software is based on the modified hybrid genetic algorithm which includes a series of enhanced genetic operators to maintain the viability of experimental solutions and ceases using a stochastic stopping rule.…”

Section: Iir Filtermentioning

confidence: 99%

POSIT vs. Floating Point in Implementing IIR Notch Filter by Enhancing Radix-4 Modified Booth Multiplier

et al. 2022

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The increased demand for better accuracy and precision and wider data size has strained current the floating point system and motivated the development of the POSIT system. The POSIT system supports flexible formats and tapered precision and provides equivalent accuracy with fewer bits. This paper examines the POSIT and floating point systems, comparing the performance of 32-bit POSIT and 32-bit floating point systems using IIR notch filter implementation. Given that the bulk of the calculations in the filter are multiplication operations, an Enhanced Radix-4 Modified Booth Multiplier (ERMBM) is implemented to increase the calculation speed and efficiency. ERMBM enhances area, speed, power, and energy compared to the POSIT regular multiplier by 26.80%, 51.97%, 0.54%, and 52.22%, respectively, without affecting the accuracy. Moreover, the Taylor series technique is adopted to implement the division operation along with cosine arithmetic unit for POSIT numbers. After comparing POSIT with floating point, the accuracy of POSIT is 92.31%, which is better than floating point’s accuracy of 23.08%. Moreover, POSIT reduces area by 21.77% while increasing the delay. However, when the ERMBM is utilized instead of the POSIT regular multiplier in implementing the filter, POSIT outperforms floating point in all the performance metrics including area, speed, power, and energy by 35.68%, 20.66%, 31.49%, and 45.64%, respectively.

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Section: Iir Filtermentioning

confidence: 99%

POSIT vs. Floating Point in Implementing IIR Notch Filter by Enhancing Radix-4 Modified Booth Multiplier

et al. 2022

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“…This was done to maximize the secrecy rate when the transmitting power limit and unit modulus of the IRS phase shifts were constrained. A fast solution was proposed to solve these constrained optimization problems with a modified genetic algorithm [ 21 ]. Yu et al introduced a robust secure transmission scheme, which considered imperfect channel state information (CSI) in the wiretap channel [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

On the Secure Performance of Intelligent Reflecting Surface-Assisted HARQ Systems

Duan

et al. 2023

Entropy

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This paper analyzes the physical layer security performance of hybrid automatic repeat request (HARQ) systems with the assistance of an intelligent reflecting surface (IRS) and aims to reveal the primary factors that enhance PLS. First, closed-form expressions for the connection outage probability (COP) and secrecy outage probability (SOP) in HARQ with chase combining (HARQ-CC) are acquired using the generalized-K (KG) distribution. Then, these two critical metrics are derived while adopting HARQ with incremental redundancy (HARQ-IR), resorting to the mixture gamma (MG) distribution and the Mellin transform. Diversity and coding gain are also addressed through an asymptotic analysis of the COP and SOP. Finally, an evaluation of the numerical results demonstrates that a greater gain in the main channel and the wiretap channel can be produced by increasing the number of meta-surfaces rather than increasing the maximum transmission number, except for the higher signal-to-noise (SNR) region of HARQ-IR where the latter is preferred. This finding provides a significant guidance for the joint configuration of IRS and HARQ to achieve secure communication.

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“…Based on the input-output relation, a dynamic system should be determined (i.e., the echo path), considering various parameters and external factors that must be estimated. These dynamic systems are modeled linearly through an adaptive filter with a finite-impulse-response (FIR) structure [5,6]. The main performance bottlenecks, in terms of computational complexity, tracking, and convergence rate, arise when the length of the impulse response reaches hundreds/thousands of coefficients.…”

Section: Introductionmentioning

confidence: 99%

Cascaded RLS Adaptive Filters Based on a Kronecker Product Decomposition

Rusu

Ciochină

Paleologu³

et al. 2022

Electronics

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The multilinear system framework allows for the exploitation of the system identification problem from different perspectives in the context of various applications, such as nonlinear acoustic echo cancellation, multi-party audio conferencing, and video conferencing, in which the system could be modeled through parallel or cascaded filters. In this paper, we introduce different memoryless and memory structures that are described from a bilinear perspective. Following the memory structures, we develop the multilinear recursive least-squares algorithm by considering the Kronecker product decomposition concept. We have performed a set of simulations in the context of echo cancellation, aiming both long length impulse responses and the reverberation effect.

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GenConstraint: A programming tool for constraint optimization problems

Cited by 15 publications

References 18 publications

POSIT vs. Floating Point in Implementing IIR Notch Filter by Enhancing Radix-4 Modified Booth Multiplier

POSIT vs. Floating Point in Implementing IIR Notch Filter by Enhancing Radix-4 Modified Booth Multiplier

On the Secure Performance of Intelligent Reflecting Surface-Assisted HARQ Systems

Cascaded RLS Adaptive Filters Based on a Kronecker Product Decomposition

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