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  • Open Access

    ARTICLE

    XGBoost Based Multiclass NLOS Channels Identification in UWB Indoor Positioning System

    Ammar Fahem Majeed1,2,*, Rashidah Arsat1, Muhammad Ariff Baharudin1, Nurul Mu’azzah Abdul Latiff1, Abbas Albaidhani3

    Computer Systems Science and Engineering, Vol.49, pp. 159-183, 2025, DOI:10.32604/csse.2024.058741 - 03 January 2025

    Abstract Accurate non-line of sight (NLOS) identification technique in ultra-wideband (UWB) location-based services is critical for applications like drone communication and autonomous navigation. However, current methods using binary classification (LOS/NLOS) oversimplify real-world complexities, with limited generalisation and adaptability to varying indoor environments, thereby reducing the accuracy of positioning. This study proposes an extreme gradient boosting (XGBoost) model to identify multi-class NLOS conditions. We optimise the model using grid search and genetic algorithms. Initially, the grid search approach is used to identify the most favourable values for integer hyperparameters. In order to achieve an optimised model configuration,… More >

  • Open Access

    ARTICLE

    Propagation Characterization and Analysis for 5G mmWave Through Field Experiments

    Faizan Qamar1, Mhd Nour Hindia2, Tharek Abd Rahman3, Rosilah Hassan1, Kaharudin Dimyati2, Quang Ngoc Nguyen4,*

    CMC-Computers, Materials & Continua, Vol.68, No.2, pp. 2249-2264, 2021, DOI:10.32604/cmc.2021.017198 - 13 April 2021

    Abstract The 5G network has been intensively investigated to realize the ongoing early deployment stage as an effort to match the exponential growth of the number of connected users and their increasing demands for high throughput, bandwidth with Quality of Service (QoS), and low latency. Given that most of the spectrums below 6 GHz are nearly used up, it is not feasible to employ the traditional spectrum, which is currently in use. Therefore, a promising and highly feasible effort to satisfy this insufficient frequency spectrum is to acquire new frequency bands for next-generation mobile communications. Toward… More >

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