Search
82 articles for “multiple channels”
-
High-Energy Astrophysics: Exploring the Extreme Universe Through Radiation, Relativistic Phenomena, and Cosmic Cataclysms
Abstract: High-energy astrophysics is a fast-developing area of astrophysical research dedicated to exploring the universe’s most powerful and extreme events. It involves investigating dense and energetic cosmic objects and phenomena, including black holes, neutron stars, supernova remnants, gamma-ray bursts, and active galactic nuclei. These sources emit radiation predominantly in the X-ray and gamma-ray regions of the electromagnetic spectrum and are often associated with high-energy particles, including cosmic rays and neutrinos. Investigating …
Published in International Journal of Universe · Vol. 2, Issue 1, 2026 · pp. 10–15 Read article
-
Performance Enhancement of Broadband Cellular Networks Using Massive MIMO Technology
Abstract: The rapid growth of mobile data traffic driven by smartphones, Internet of Things (IoT) devices, video streaming, and cloud-based applications has placed significant pressure on existing broadband cellular networks. As the need for faster data transmission, enhanced spectrum utilization, and dependable wireless communication continues to grow, Massive Multiple-Input Multiple-Output (Massive MIMO) has become a fundamental technology for modern communication networks, particularly in 5G and future-generation wireless systems. Massive MIMO technology …
Published in Journal of Communication Engineering & Systems · Vol. 16, Issue 2, 2026 · pp. 11–18 Read article
-
Effect of Fragment Size and Contention Window on the Performance of IEEE 802.11 WLANs
Abstract: Wireless communications is, by any measure, the fastest growing segment of the communications industry. The IEEE has standardized the 802.11 protocol for wireless local area networks. The IEEE 802.11 standard has defined two different access mechanisms in order to allow multiple users to access a common channel, the distributed coordination function (DCF) and a centrally controlled access mechanism called the point coordination function (PCF). DCF is a carrier sense multiple …
Published in Journal of Telecommunication, Switching Systems and Networks · Vol. 3, Issue 2, 2016 · pp. 6–12 Read article
-
ABER of Transmit Antenna Selection with Maximal Ratio Combinining-MIMO System over Nakagami-m Fading Channels
Abstract: AbstractThis paper presents the average bit error rate (ABER) of a multiuser, multiple input and multiple output (MIMO) wireless system. Transmit antenna selection at the base station and maximal ratio combining at the receiver is considered for downlink transmission. For coherent and noncoherent modulation schemes, ABER performance of the system is analyzed. The closed form expressions have been derived for ABER considering Nakagami-m fading channels. The effects of fading parameter …
Published in Journal of Communication Engineering & Systems · Vol. 9, Issue 1, 2019 · pp. 43–48 Read article
-
Channel Prediction and Estimation Based on Machine and Deep Learning Techniques: A Review
Abstract: Channel prediction estimation in the high- speed mobile environment is a hot issue for 3D massive multiple input multiple output (MIMO) millimeter-wave (mmWave) system. In this environment, the channel has fast time-varying and non-stationary characteristics. And its time-domain correlation coefficient is a time- varying parameter, which makes it difficult for traditional channel estimation methods to capture the channel variations over time and achieve ideal channel estimation performance. A known signal, …
Published in Journal of Telecommunication, Switching Systems and Networks · Vol. 10, Issue 3, 2023 · pp. 13–17 Read article
-
Performance Analysis of 160 Channel WDM System with EDFA Amplifier
Abstract: AbstractErbium Doped Fiber Amplifier (EDFA) amplifiers are popularly used in wavelength division multiplexing (WDM) system to compensate attenuation and dispersion. The performance of EDFA depends on various parameters such as, EDFA length, Er+3 doping concentration, active fiber length, pump power, pumping wavelength etc. This paper analyzed the performance of EDFA with counter pumping and co-pumping varying the EDFA length, pump power and Er+3 doping concentration and optimized the values for …
Published in Trends in Opto-electro & Optical Communication · Vol. 7, Issue 3, 2017 · pp. 25–34 Read article
-
Traffic Aware Coloring based Scheduling Scheme for Mobile Wireless Body Area Networks
Abstract: AbstractEvolution in the wireless technology and supportive infrastructure offer innovative opportunities for healthcare and fitness monitoring applications without restricting activities of the user. The wireless body area networks (WBAN) have ability to bring revolution in the healthcare field. In spite of this ability WBAN have some technical challenges that need to be researched. The biggest challenge in WBAN is to provide quality of service. Many scheduling techniques have been proposed …
Published in Journal of Electronic Design Technology · Vol. 8, Issue 3, 2017 · pp. 8–11 Read article
-
Unconventional Methodology for Crafting Nano-Scale SOI-Based Devices Tailored for 5GMillimeter Wave Implementations
Abstract: The advent of 5G technology has indeed revolutionized modern life, bringing about unprecedented ease and giving rise to a myriad of emerging applications such as Artificial Intelligence (AI), Augmented and Virtual Reality (AR/VR), and Industry 4.0. This transformative technology has particularly catalyzed advancements in the medical and communication fields, prompting the need for innovative nanoscale devices to enhance system performance. The higher-frequency applications facilitated by 5G, such as Massive Machine …
Published in Journal of Nanoscience, NanoEngineering & Applications · Vol. 13, Issue 2, 2023 · pp. 1–10 Read article
-
Comparison & Improvement in Channel Estimation Techniques for Next Generation Network Using mm wave OFDM Channel
Abstract: This paper develops schemes for orthogonal matching pursuit (OMP), bayesian Cramer Rao Bound & ORACLE-LS channel estimation technique in milli-meter wave (mm-Wave) multiple-input-multipleoutput (MIMO) systems that exploit the spatial sparsity inherent in channels. In simulation results shows comparison between ORACLE LS & orthogonal matching pursuit (OMP) on the basis of NMSE v/s SNR comparison between orthogonal matching pursuit OMP, MSBL, and TSBL-based & various channel estimation techniques for the mm-Wave …
Published in Journal of Telecommunication, Switching Systems and Networks · Vol. 8, Issue 4, 2021 · pp. 1–6 Read article
-
Outage Probability of TAS/MRC Systems over Nakagami-m Fading Channels with Correlation
Abstract: This paper analyzes the outage probability of a multiple-input multiple-output (MIMO) transmit antenna selection with a maximal ratio combining (TAS/MRC) system considering equal and exponential correlation among the input branches of MRC receiver. In TAS/MRC system the transmitter selects the best antenna out of the total transmit antennas based on the channel state information (CSI) of each user. A closed form expression has been derived for outage probability considering Nakagami-m …
Published in Journal of Electronic Design Technology · Vol. 7, Issue 1, 2016 · pp. 39–45 Read article
-
Survey Based Study of OFDM System and PAPR Reduction Techniques
Abstract: The need of Modern wireless communication is achieving high data transmission rate and its robustness against multipath fading & good spectral efficiency MIMO-OFDM system is popular because it provides reliable communication & wide coverage. Orthogonal Frequency Division Multiplexing is a multicarrier modulation technique which is prime choice for high data rate application. To improve performance of OFDM we use various techniques such as channel estimation, signal detection, frequency offset estimation …
Published in Recent Trends in Electronics Communication Systems · Vol. 1, Issue 1, 2014 · pp. 32–36 Read article
-
Numerical Modelling and Simulation of Improved Partial Transmit Sequence for PAPR Reduction in OFDM Communication System
Abstract: Channel capacity and peak average to power ratio are essential elements in offering dependable communication through wireless medium in this competing wireless communication system. The rating of an amplifier in an OFDM system, as well as prospective future candidates of 5G systems such as FBMC and UFMC, is affected by a high peak to average power ratio. The demand for channel capacity fluctuates due to the growing number of wireless …
Published in Recent Trends in Electronics Communication Systems · Vol. 8, Issue 3, 2021 · pp. 33–39 Read article
-
Analysis of Gain Bandwidth Product by Achieving Gain Flatness in EDFA for Dense Wavelength Division Multiplexed System
Abstract: In this paper, we have analyzed gain bandwidth product through gain flatness in EDFA for dense wave length division multiplexed system. The system consist of four channel DWDM with varying wavelengths of optical fiber from 1530 to 1560 nm and by changing the noise for each amplifier to achieve the quality factor and noise figure of both the amplifiers. In this article, we used the frequency spacing of 2 GHz …
Published in Journal of Telecommunication, Switching Systems and Networks · Vol. 3, Issue 2, 2016 · pp. 1–5 Read article
-
Designing of OFDM and FBMC System using QAM and QPSK Modulation Technique
Abstract: AbstractThe Fourth generation (4G) and Fifth generation (5G) are the new evolution of the mobile communication system. The fourth generation had been launched in almost all countries and the 5G is very soon launched in many countries. In India, the 5G is launched in the years of 2020s. In this article, we hut the light on the potential and implementation on the multicarrier technology system which is the 5G based …
Published in Journal of Electronic Design Technology · Vol. 9, Issue 3, 2018 · pp. 24–29 Read article
-
Simulation of Differential Space Time Block Coding
Abstract: AbstractIn such a coherent system, the underlying assumption is that the channel does not change during one frame of data. Thus, it can also be interpreted as the frame length is chosen such that the path gain change during one frame is negligible. This is basically the quasi-static fading assumption that we have used so far. There is a bandwidth penalty due to the number of transmitted pilot symbols. Of …
Published in Journal of Communication Engineering & Systems · Vol. 6, Issue 1, 2016 · pp. 19–25 Read article
-
Study of MIMO-OFDM System for Time/Frequency Selective Fading Channel
Abstract: Future-generation wireless communication system requires higher performance system in terms of high data rate with better link reliability in hostile fading environment. Orthogonal frequency division multiplexing (OFDM) and multiple-input multiple-output (MIMO) antenna systems are a popular technique for transmission of signals over wireless channels. They individually assist multipath fading environment and improve link reliability without sacrificing much bandwidth and also provide high data rate. The combination of OFDM and MIMO …
Published in Recent Trends in Sensor Research & Technology · Vol. 2, Issue 3, 2015 · pp. 31–37 Read article
-
Analysis of a Communication Link Performance Across Various Rayleigh Channels in Tropical Climates
Abstract: Tropical regions are characterized by intense and persistent rainfall throughout most of the year, and this environmental condition significantly influences wireless communication performance. The continuous presence of heavy precipitation weakens, scatters, and disrupts radio frequency signals, causing noticeable attenuation during transmission from the source to the destination. As a result, reliable communication becomes challenging, particularly for modern high-speed systems such as 5G networks. To address this limitation and enhance communication …
Published in Journal of Communication Engineering & Systems · Vol. 16, Issue 1, 2026 · pp. 06–12 Read article
-
ALADIN and its Protein Interactions with the Nucleoproteins: An Insilico Analysis
Abstract: The nuclear pore complex (NPCs) are big, protein complexes made up of multiple units that traverse the nuclear envelope (NE), establishing a discerning channel between the cytoplasm and nucleus for the nucleocytoplasmic transport. It has different roles in cellular processes, like cell-cycle progression, control of gene expression, and signal transduction. NPC is a vast and complex structure, compiled from almost 30 proteins, termed nucleoporins. Earlier studies have shown that each …
Published in Research and Reviews : Journal of Computational Biology · Vol. 7, Issue 1, 2018 · pp. 28–31 Read article
-
BER Analysis of Convolutional Encoded DWT-OFDM and coded FFT-OFDM under Different Simulation Conditions
Abstract: In this study, we investigated the performance of Convolutional encoded Discrete Wavelet Transform based orthogonal frequency division multiplexing (DWT-OFDM) system over additive white Gaussian noise (AWGN) channel. QAM and PSK modulation have been used for simulations. Performance of Convolutional encoded DWT-OFDM is compared with uncoded DWT-OFDM system and encoded conventional OFDM system. Bit error rate (BER) is used as measuring parameter. Simulations have been done using MATLAB software. It has …
Published in Research & Reviews : Journal of Physics · Vol. 8, Issue 1, 2019 · pp. 7–19 Read article
-
Performance Evaluation of Multiple Data Rates Flying Ad Hoc Networks Using Rayleigh Fading
Abstract: AbstractAn exertion has been made to delineate the execution of the Rayleigh fading channel models by utilizing QualNet test system as far as QoS parameters are concerned. A situation has been created here for the Rayleigh fading channels with different parameters. The parameters such as data rate and speed of nodes play very important role in the performance analysis and design of the flying ad hoc network over the multipath …
Published in Journal of Telecommunication, Switching Systems and Networks · Vol. 5, Issue 2, 2018 · pp. 8–14 Read article