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Advancements in Digital Signal Processing: Emerging Applications and Optimized Implementations

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Electrical, Electronics and Communications Engineering".

Deadline for manuscript submissions: 20 March 2027 | Viewed by 1064

Special Issue Editor


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Guest Editor
Faculty of Electronics, Telecommunications and Information Technology, “Gheorghe Asachi” Technical University of Iasi, Iasi, Romania
Interests: digital signal processing (DSP); adaptive signal processing; blind equalization/identification; fast computational algorithms; parallel and VLSI algorithms and architectures for communications and DSP; high-level DSP design
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In the new era of digital revolution, new advanced DSP applications have appeared. The advances in modern DSP applications, such as multimedia, big data, IoT, etc., have increased the importance of the optimization and efficient implementation of DSP algorithms and architectures, both for a VLSI or a software VLSI implementation. We can say that they represent an essential part of the research in such modern applications.

For real-time implementations of such modern DSP applications, an efficient optimization of such algorithms and architectures for an efficient VLSI implementation is often a critical and challenging issue. For example, real-time multimedia applications have increasingly greater performance requirements due to data processing and transmission of huge data volumes at high speeds, with resource constraints specific to portable devices.

This Special Issue focuses on papers that demonstrate how these design challenges can be overcome using innovative solutions.

Topics of interest for this Special Issue include, but are not limited to, the following:

  • VLSI signal processing;
  • Signal processing methods for efficient implementation;
  • Optimization of the VLSI implementation of multimedia blocks;
  • Low-power circuits and systems for DSP applications;
  • Efficient adaptive/learning algorithms (low complexity/fast versions, optimized parameters, etc.);
  • Tensor-based signal processing (efficient decomposition methods, low-rank approximations, etc.);
  • Sparsity-aware algorithms.

Prof. Dr. Doru Florin Chiper
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • VLSI signal processing
  • signal processing methods
  • efficient implementation
  • multimedia blocks
  • low power circuits and systems
  • efficient adaptive algorithms
  • learning algorithms
  • efficient decomposition methods
  • low-rank approximations
  • sparsity exploitation

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Published Papers (2 papers)

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Research

15 pages, 697 KB  
Article
Variable Forgetting Factor RLS Adaptive Algorithms Based on Line Search Methods
by Radu-Andrei Otopeleanu, Cristian-Lucian Stanciu, Constantin Paleologu and Jacob Benesty
Appl. Sci. 2026, 16(10), 4681; https://doi.org/10.3390/app16104681 - 9 May 2026
Viewed by 126
Abstract
Recursive least-squares (RLS) adaptive algorithms are capable of outperforming least-mean-square (LMS) methods for the identification of long-length impulse responses due to their ability to mitigate the high correlation properties of input signals, such as speech. Despite the encouraging results obtained in terms of [...] Read more.
Recursive least-squares (RLS) adaptive algorithms are capable of outperforming least-mean-square (LMS) methods for the identification of long-length impulse responses due to their ability to mitigate the high correlation properties of input signals, such as speech. Despite the encouraging results obtained in terms of tracking speed and accuracy, with respect to LMS methods, most RLS algorithms manifest numerical stability issues. Moreover, when an unknown system changes, the identification process needs to adapt to the new impulse response as soon as possible. The algorithm can require a significant amount of time to generate new accurate results in acoustic echo cancellation (AEC) scenarios. Due to the slow propagation speed of sound, acoustic echo paths are usually modeled using thousands of numerical coefficients, and adaptation energy remains relatively limited. A compromise is usually made between tracking capabilities and steady-state accuracy when choosing the forgetting factor (the most important parameter of the RLS algorithm). This paper analyzes a variable forgetting factor (VFF) RLS type of adaptive filter combined with the conjugate gradient (CG) line search method, which is designed to avoid the classical matrix inversion approach. This VFF-RLS-CG adaptive method is not susceptible to numerical stability issues and is designed to adapt its statistical estimates by determining whether a tracking situation occurs or whether the unknown system is not significantly different. Correspondingly, when necessary, the forgetting factor is decreased for faster adaptation to changes in the working environment. When the filter is estimated to work at steady-state, the above-mentioned parameter’s value is increased in order to boost the accuracy of the adaptive filter. The theoretical model is validated using simulations in AEC scenarios with tracking occurrences and relevant steady-state intervals. Full article
17 pages, 1997 KB  
Article
Indoor Localization for 6G Communication Systems Under Single Co-Channel Interference Using a Back Propagation Neural Network with Hybrid Self-Attention
by Chien-Ching Chiu, Hung-Yu Wu, Po-Hsiang Chen, Chen-En Chao and Eng Hock Lim
Appl. Sci. 2026, 16(5), 2264; https://doi.org/10.3390/app16052264 - 26 Feb 2026
Viewed by 394
Abstract
Recent advancements in digital signal processing and lightweight neural architectures have opened new possibilities for developing efficient and interference-resilient indoor localization systems suitable for next-generation wireless networks. This paper proposes an indoor localization system for 6G communication systems with single co-channel interference. Ray [...] Read more.
Recent advancements in digital signal processing and lightweight neural architectures have opened new possibilities for developing efficient and interference-resilient indoor localization systems suitable for next-generation wireless networks. This paper proposes an indoor localization system for 6G communication systems with single co-channel interference. Ray tracing technique is used to compute the frequency-domain channel state information (CSI). Next, CSI fingerprints are input into a lightweight back propagation neural network (BPNN) with channel-wise self-attention (CSA) and spatial self-attention (SSA) to improve the model’s resilience to interference and noise. Numerical results demonstrate that the attention-enhanced BPNN models significantly outperform the standard BPNN. In particular, CSA focuses on informative frequency channels and excels under spectral distortion caused by interference, while SSA puts emphasis on spatial features and shows superior performance in spatially stable environments, reducing RMSE by up to 20% in high interference scenarios and 10% in low interference scenarios, respectively. These findings validate the effectiveness of integrating attention mechanisms into neural localization frameworks, making them well-suited for next-generation 6G indoor positioning systems in interference-limited environments. Full article
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