This paper shows an analysis how to calculate proper bandwidth for VoIP calls after proper dimensioning PSTN network. For this purpose, we use Erlang B and extended Erlang B formulas. Further, we have developed a software tool to calculate proper numbers of the circuits on the PSTN side (using our bandwidth calculator) and after that, bandwidth on the IP. By another word, traffic analysis will be conducted to VoIP networks considering impact of many factors on the bandwidth: voice codec, samples, VAD, RTP compression. The regression analysis is used to show trends of the subscriber behavior in the future (for specific category of subscribers). Finally, simulation results are compared with data obtained by bandwidth calculator.

This paper presents HERMEES—Holistic Evaluation and Ranking Model for Energy Efficient Systems. HERMEES is based on a multi-criteria decision-making (MCDM) model designed to select the optimal combination of lightweight cryptography (LWC) and topology construction protocol (TCP) algorithms for wireless sensor networks (WSNs) based on user-defined scenarios. The proposed model is evaluated using a scenario based on a medium-sized agricultural field. The Simple Additive Weighting (SAW) method is used to assign scores to the candidate algorithm pairs by weighting the scenario-specific criteria according to their significance in the decision-making process. To further refine the selection, mean shift clustering is utilized to group and identify the highest scored candidates. The resulting model is versatile and adaptable, enabling WSNs to be configured according to specific operational needs. The provided pseudocode elucidates the model workflow and aids in an effective implementation. The presented model establishes a solid foundation for the development of guided self-configuring context-aware WSNs capable of dynamically adapting to a wide range of application requirements.

In this letter, we analyze a method for designing an optimized multistage decimation filter chain focused on minimizing computational load. Decimation ratios for each of the K stages are determined to achieve the optimal number of filter multiplications per second. To enable the optimal factorization of non-integer or prime decimation ratios, the first stage of the decimation chain is designed to perform non-integer decimation using a transposed modified Farrow structure. We evaluate the performance of the optimized multistage filter chain with varying numbers of stages and compare it to an optimal FIR realization. The results demonstrate that the Farrow structure significantly reduces the computational load for prime and non-integer decimation cases and benefits non-prime cases.