Browsing by Author "38f556a0-91c3-4b93-88fc-4cac871ed2c1"
Now showing items 1-9 of 9
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A multi-channel speech enhancement method based on subband affine projection algorithm in combination with proposed circular nested microphone array
Dehghan Firoozabadi, Ali; Irarrazaval, Pablo; Adasme, Pablo; Durney, Hugo; Sanhueza, Miguel; Zabala-Blanco, David; Azurdia-Meza, Cesar A. (2021)In this paper, a novel multi-channel speech enhancement system is introduced based on a proposed circular nested microphone array (C-NMA) in combination with subband affine projection algorithm (SB-APA). The multi-channel ...
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A VLC channel model for underground mining environments with scattering and shadowing
Palacios-Játiva, Pablo; Azurdia-Meza, Cesar A.; Sánchez, Iván; Seguel, Fabian; Zabala-Blanco, David; Dehghan Firoozabadi, Ali; Gutiérrez, Carlos A.; Soto, Ismael (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, ...
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BER improvement using the better than double-jump 2 pulse in OFDM schemes prone to frequency offset
Zabala-Blanco, David; Azurdia-Meza, Cesar A.; Kamal, Shaharyar; Dehghan Firoozabadi, Ali; Montejo-Sánchez, Samuel (2019)Orthogonal frequency division multiplexing (OFDM) is highly sensitive to frequency offset since it induces inter-carrier interference (ICI). Fortunately, the pulse shaping filter method has proven its potential to reduce ...
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Evaluation of localization precision by proposed quasi-spherical nested microphone array in combination with multiresolution adaptive steered response power
Dehghan Firoozabadi, Ali; Irarrazaval, Pablo; Adasme, Pablo; Zabala-Blanco, David; Azurdia-Meza, Cesar A. (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 ...
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Finite field metrics applied to M-FSK modulation in VLC systems
Guajardo-Penroz, Cristobal; Soto, Ismael; San-Juan, Enrique; Adasme, Pablo; Azurdia-Meza, Cesar A.; Zabala-Blanco, David (2020)This paper provides an alternative to digital filter based frequency detection for multi-frequency shift keying modulation (M-FSK) using field programmable gate array (FPGA) architectures, by providing a hamming space ...
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Improved double-jump 2 pulse to compensate frequency offset in MQAM-OFDM systems
Zabala-Blanco, David; Azurdia-Meza, Cesar A.; Palacios-Játiva, Pablo (2020)Orthogonal frequency division multiplexing (OFDM) is severely affected by the frequency offset because of it causes inter-carrier interference (ICI). ICI can be diminished with the assistance of any pulse that complies the ...
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Multiresolution speech enhancement based on proposed circular nested microphone array in combination with sub-band affine projection algorithm
Dehghan Firoozabadi, Ali; Irarrazaval, Pablo; Adasme, Pablo; Zabala-Blanco, David; Durney, Hugo; Sanhueza, Miguel; Palacios-Játiva, Pablo; Azurdia-Meza, Cesar A. (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 ...
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Performance analysis of OFDM-Based VLC schemes in NLOS channels
Palacios-Játiva, Pablo; Azurdia-Meza, Cesar A.; Román Cañizares, Milton; Zabala-Blanco, David; Montejo-Sánchez, Samuel (2020)In this paper, several Orthogonal frequency division multiplexing (OFDM)-based Visible light Communications (VLC) techniques designed for intensity modulation/direct detection (IM/DD) are evaluated and compared for various ...
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Simultaneous sound source localization by proposed cuboids nested microphone array based on subband generalized eigenvalue decomposition
Dehghan Firoozabadi, Ali; Irarrazaval, Pablo; Adasme, Pablo; Durney, Hugo; Sanhueza, Miguel; Zabala-Blanco, David; Azurdia-Meza, Cesar A. (2020)Multiple sound source localization is an important application in speech processing. In this paper, a cuboids nested microphone array (CuNMA) is proposed for sound acquisition. Also, the spatial aliasing is eliminated by ...