Browsing by Author "3dc6ddf2-adcb-4237-974c-9105d648ff75"

Now showing items 1-14 of 14

    • 3D multiple sound source localization by proposed cuboids nested microphone array in combination with ... 
      Dehghan Firoozabadi, Ali; Irarrázaval, Pablo; Adasme, Pablo; Zabala Blanco, David; Palacios Játiva, Pablo Geovanny; Azurdia Meza, César (MDPI, 2020)
      Sound source localization is one of the applicable areas in speech signal processing. The main challenge appears when the aim is a simultaneous multiple sound source localization from overlapped speech signals with an ...
    • A Hybrid VLC-RF Portable Phasor Measurement Unit for Deep Tunnels 
      Soto, Ismael; Nilson Rodrigues, Rafael; Massuyama, Gabriel; Seguel, Fabián; Palacios Játiva, Pablo; Azurdia Meza, César; Krommenacker, Nicolás (MDPI, 2020)
      In this manuscript we propose a hybrid Visible Light Communication and Radio Frequency (VLC-RF) scheme for the implementation of a portable Phaser Measurement Unit (PMU) for deep underground tunnels. Through computer ...
    • A novel method for estimating the number of speakers based on generalized eigenvalue-vector decomposition ... 
      Dehghan Firoozabadi, Ali; Irarrázaval, Pablo; Adasme, Pablo; Zabala Blanco, David; Azurdia Meza, César (Springer, 2020)
      The aim of this article is estimating the number of simultaneous speakers from the overlapped speech signals. The percentage of correct number of speakers is an important factor for the proposed algorithm. The proposed ...
    • A novel strategy for LED re-utilization for visible light communications 
      Seguel, F.; Firoozabadi, A. Dehghan; Adasme, P.; Soto I., Marina; Krommenacker, N.; Azurdia Meza, César (Elsevier, 2017)
      A resource allocation optimization model for downlink indoor Optical Wireless Communications networks (OWC) is proposed in this paper. The optimization problem is formulated as a mixed integer binary problem. A centralized ...
    • A VLC Channel Model for Underground Mining Environments With Scattering and Shadowing 
      Palacios Jativa, Pablo; Azurdia Meza, César; Sánchez, Iván; Seguel, Fabián; Zabala Blanco, David; Firoozabadi, Ali Dehghan; Gutiérrez, Carlos A.; Soto, Ismael (IEEE-Inst Electrical Electronics Engineers, 2020)
      Underground mining is an industry that preserves the miners' safety and efficiency in their work using wireless communication systems as a tool. In addition to communication links characterized by radio frequency signals, ...
    • Communication Requirements in Microgrids: A Practical Survey 
      Serban, Ioan; Céspedes Umaña, Sandra; Marinescu, Corneliu; Azurdia Meza, César; Gómez, Juan S.; Sáez Hueichapán, Doris (IEEE, 2020)
      Progress in Microgrid (MG) research has evolved the MG concept from classical, purely MG power networks to more advanced power and communications networks. The communications infrastructure helps control and manage the ...
    • Evaluation of localization precision by proposed quasi-spherical nested microphone array in combination ... 
      Firoozabadi, Ali Dehghan; Irarrázaval, Pablo; Adasme, Pablo; Zabala Blanco, David; Azurdia Meza, César (Slovak Univ. Technology, 2020)
      Multiple sound source localization in noisy and reverberant conditions is one of the important challenges in the speech signal processing. The aim of this article is three-dimensional sound source localization in undesirable ...
    • Interference mitigation for visible light communications in underground mines using angle diversity receivers 
      Palacios Játiva, Pablo Geovanny; Román Canizares, Milton; Azurdia Meza, César; Zabala Blanco, David; Dehghan Firoozabad, Ali; Seguel, Fabián; Montejo Sánchez, Samuel; Soto, Ismael (MDPI, 2020)
      This paper proposes two solutions based on angle diversity receivers (ADRs) to mitigate inter-cell interference (ICI) in underground mining visible light communication (VLC) systems, one of them is a novel approach. A ...
    • Low-PAPR Hybrid Filter for SC-FDMA 
      Kamal, Shaharyar; Azurdia Meza, César; Tran, Nguyen H.; Lee, Kyesan (IEEE, 2017)
      We propose a hybrid filter to reduce the peak-to-average power ratio (PAPR) on the transmitter side in a long-term evolution uplink scheme. The design of the proposed filter is based on two key components: a finite impulse ...
    • Multiresolution Speech Enhancement Based on Proposed Circular Nested Microphone Array in Combination with ... 
      Firoozabadi, Ali Dehghan; Irarrázaval, Pablo; Adasme, Pablo; Zabala Blanco, David; Durney, Hugo; Sanhueza, Miguel; Palacios Jativa, Pablo; Azurdia Meza, César (MDPI, 2020)
      Speech enhancement is one of the most important fields in audio and speech signal processing. The speech enhancement methods are divided into the single and multi-channel algorithms. The multi-channel methods increase the ...
    • OFDM tolerance to additive white Gaussian and laser phase noises in optical heterodyning systems accompanied ... 
      Zabala Blanco, David; Azurdia Meza, César; Montejo Sánchez, Samuel; Dehghan Firoozabadi, Ali (Optical Society of Japan, 2020)
      It is well known that the performance of orthogonal frequency division multiplexing (OFDM) is limited by phase noise, which depends on the laser linewidths for coherent-detection radio over fiber (RoF) systems. In this ...
    • Subsiding OOB Emission and ICI Power Using iPOWER Pulse in OFDM Systems 
      Kamal, Shaharyar; Azurdia Meza, César; Lee, Kyesan (Univ Suceava, Fac Electrical Eng, 2016)
      A novel family of Nyquist-I pulses called iPOWER is proposed with a new design parameter. that provides an extra degree of freedom for a certain roll-off factor, a. The proposed pulse is examined and compared with other ...
    • Suppressing the effect of ICI power using dual sinc pulses in OFDM-based systems 
      Kamal, Shaharyar; Azurdia Meza, César; Lee, Kyesan (Elsevier, 2016)
      Sensitivity to frequency offset in orthogonal frequency division multiplexing (OFDM)-based systems allow unwanted interference among the subcarriers, which results in intercarrier interference (ICI). A novel family of ...
    • The internet of interlaced cyber-physical things 
      Estévez Montero, Claudio; Azurdia Meza, César; Céspedes Umaña, Sandra (CRC Press, 2015-10)
      As technology keeps evolving, information becomes more accessible due to the newly acquired attributes, mainly ubiquity. The Internet of Things (IoT) is the extraction of information from the local area network and ...