Search Results - "Lopes, Waslon T A"

On the Adaptive Modulation for User-Centric Cell-Free Massive MIMO Systems by Almeida, Danilo B. T., Alencar, Marcelo S., Duarte, Rafael M., Silva, Hugerles S., Madeiro, Francisco, Lopes, Waslon T. A., Queiroz, Wamberto J. L.

“…The cell-free (CF) systems are a key technology for future wireless networks, which exploit the scenario spatial macro-diversity to offer high channel capacity…”
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On the Performance of Location Management in 5G Network Using RRC Inactive State by Oliveira, Lidiano A. N., Alencar, Marcelo S., Lopes, Waslon T. A., Madeiro, Francisco

“…Among the characteristics in fifth generation (5G) networks, a massive number of devices and a network densification stand out. Hence, efficient location…”
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Performance of the modulation diversity technique for κ-μ fading channels by Lopes, Rafael F, L Queiroz, Wamberto J, A Lopes, Waslon T, Alencar, Marcelo S

“…The performance of wireless communication systems can be significantly improved using the modulation diversity technique, which is based on the combination of…”
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An Alternative Method to Compute the Bit Error Probability of Modulation Schemes Subject to Nakagami-m Fading by Queiroz, Wamberto J L, Lopes, Waslon T A, Madeiro, Francisco, Alencar, Marcelo S

“…This paper presents an alternative method for determining exact expressions for the bit error probability (BEP) of modulation schemes subject to Nakagami-m…”
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On the performance of M-QAM for Nakagami channels subject to gated noise by Queiroz, Wamberto J. L., Madeiro, Francisco, Lopes, Waslon T. A., Alencar, Marcelo S.

“…This paper presents a mathematical analysis of the joint effects of additive white Gaussian noise and gated noise in an M -ary Quadrature Amplitude Modulation…”
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Performance analysis of generalized QAM modulation under η−μ and κ−μ fading by Queiroz, Wamberto J. L., Madeiro, Francisco, Lopes, Waslon T. A., Alencar, Marcelo S.

“…This paper presents new closed-form expressions for the symbol error probability (SEP) of θ -QAM modulation with maximum ratio combining (MRC) receiver under η…”
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Low-Energy Selective Cooperative Diversity with ARQ for Wireless Image Sensor Networks by Sousa, Marcelo P, Lopes, Rafael F, Lopes, Waslon T A, Alencar, Marcelo S

“…Wireless Image Sensor Network (WISN) is a type of sensor network, which has the ability of capturing, processing and transmitting images from a monitored…”
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Cognitive spectrum sensing based on statistical tests in fading channels by Carvalho, Fabricio B. S., Lopes, Waslon T. A., Alencar, Marcelo S.

“…The cognitive radio concept is fostered by the scarcity of frequency bands for wireless communication. Several new techniques and algorithms are being proposed…”
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Interference mitigation in anisotropic diffusion environments by using symmetric linear arrays by Queiroz, Wamberto J. L., Alencar, Marcelo S., Lopes, Waslon T. A., Madeiro, Francisco

“…This paper presents an analysis of the mutual interference among users' equipment for channels with local scatterers, such as buildings, trees and other urban…”
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Spectrum sensing via statistic tests in Rayleigh fading channels by de Carvalho, Fabricio B. S., Lopes, Waslon T. A., Alencar, Marcelo S.

“…Cognitive radio applications are limited by the scarcity of available frequency bands for telecommunication services. The improvement of the spectrum sensing…”
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Performance analysis of generalized QAM modulation under [eta]-[mu] and [kappa]-[mu] fading: Doc 479 by L Queiroz, Wamberto J, Madeiro, Francisco, A Lopes, Waslon T, Alencar, Marcelo S

“…This paper presents new closed-form expressions for the symbol error probability (SEP) of [theta]-QAM modulation with maximum ratio combining (MRC) receiver…”
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A Modified Jarque-Bera Test for Spectrum Sensing in Cognitive Networks Subject to Rayleigh Fading by Carvalho, Fabricio B. S., Lopes, Waslon T. A., Alencar, Marcelo S.

“…This paper presents a new algorithm based on the Jarque-Bera (JB) test for spectrum sensing in cognitive networks subject to Rayleigh fading. In the proposed…”
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Cooperative STBC with fuzzy election applied to surveillance wireless video sensor networks by Sousa, Marcelo P, Lopes, Rafael F, Kumar, Ajey, Lopes, Waslon T A, Alencar, Marcelo S

“…Wireless video sensor networks (WVSNs) have obtained popularity due to numerous potential applications such as video surveillance, environmental and habitat…”
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Performance of the modulation diversity technique for [kappa]-[mu] fading channels by Lopes, Rafael F, L Queiroz, Wamberto J, A Lopes, Waslon T, Alencar, Marcelo S

“…The performance of wireless communication systems can be significantly improved using the modulation diversity technique, which is based on the combination of…”
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Exact bit error probability of M-QAM modulation over flat rayleigh fading channels by Lopes, W.T.A., Queiroz, W.J.L., Madeiro, F., Alencar, M.S.

“…In this paper we derive a general and closed- form expression for the bit error probability of square M -ary quadrature amplitude modulation ( M -QAM) for a…”
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Cooperative Space-Time Block Codes for Wireless Video Sensor Networks by Sousa, Marcelo Portela, Kumar, Ajey, Lopes, Rafael F., Lopes, Waslon T. A., de Alencar, Marcelo Sampaio

“…Wireless video sensor networks (WVSNs) are gaining popularity due to numerous potential applications such as video surveillance, environmental and habitat…”
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The impact of channel estimation errors in wireless sensor networks over cooperative modulation diversity by Sousa, Marcelo P., Lopes, Waslon T. A., Madeiro, Francisco, Alencar, Marcelo S.

“…Channel estimation errors can impact the performance of a cooperative wireless sensor network. In this paper the authors evaluate that impact, related to the…”
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An Alternative Method to Compute the Bit Error Probability of Modulation Schemes Subject to Nakagami- Fading by Queiroz, Wamberto J. L., Lopes, Waslon T. A., Madeiro, Francisco, Alencar, Marcelo S.

“…This paper presents an alternative method for determining exact expressions for the bit error probability (BEP) of modulation schemes subject to Nakagami-…”
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Evaluation of optimal and sub-optimal speech noise reduction wiener filters by Lima, Isis A., Alencar, Marcelo S., Lopes, Waslon T. A., Madeiro, Francisco

“…This paper presents a comparative evaluation of Wiener optimal and sub-optimal finite impulse response filters, which allows a balance between noise reduction…”
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Cognitive spectrum sensing via statistical tests in Rice fading channels by Carvalho, Fabricio B. S., Lopes, Waslon T. A., Alencar, Marcelo S.

“…Spectrum sensing is an important tool for the expansion of cognitive radio. This paper evaluates the use of statistical tests to optimize the spectral…”
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