Results 21 to 30 of about 485,680 (303)

Design and Implementation of Adaptive Modulation Modem Based on Software Defined Radio(SDR) for WiMAX System [PDF]

open access: yesEngineering and Technology Journal, 2010
This paper presents design and implementation of adaptivemodulation modem for WiMAX system. (BPSK, QPSK, 8QAM, 16QAM,32QAM and 64QAM) are used in this work. Software Defined Radio(SDR)is used for implementing this modem.
H. T. Ziboon, Zeinah Tariq Naif
doaj   +1 more source

Energy-Efficient Cluster-Based Wireless Sensor Networks Using Adaptive Modulation: Performance Analysis

open access: yesIEEE Access, 2021
Wireless Sensor Networks (WSNs) play a vital role in modern technology since they have recently emerged into enormous essential applications of the Internet of Things (IoT).
Amjad Abu-Baker   +2 more
doaj   +1 more source

Enhanced NOMA System Using Adaptive Coding and Modulation Based on LSTM Neural Network Channel Estimation

open access: yesApplied Sciences, 2019
Non-orthogonal multiple access (NOMA) is the technique proposed for multiple access in the fifth generation (5G) cellular network. In NOMA, different users are allocated different power levels and are served using the same time/frequency resource blocks (
Mai AbdelMoniem   +4 more
doaj   +1 more source

Upgrading Physical Layer of Multi-Carrier OGFDM Waveform for Improving Wireless Channel Capacity of 5G Mobile Networks and Beyond

open access: yesInformation, 2020
On the brink of sophisticated generations of mobile starting with the fifth-generation (5G) and moving on to the future mobile technologies, the necessity for developing the wireless telecommunications waveform is extremely required.
Mohammad R. Kadhum
doaj   +1 more source

MIMO Systems With Adaptive Modulation

open access: yesIEEE Transactions on Vehicular Technology, 2005
Adaptive modulation (AM) schemes in multiple input multiple output (MIMO) systems with a perfect or imperfect channel state information (CSI) at both the transmitter and receiver were investigated. Under an average transmit power and instantaneous bit error rate (BER) constraint, the transmit parameters including the subchannel transmit power and/or ...
Z. Zhou, B. Vucetic, M. Dohler, Y. Li
openaire   +2 more sources

On the Adaptive Modulation for User-Centric Cell-Free Massive MIMO Systems

open access: yesIEEE Access
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 and link reliability, uniform user quality of service (QoS), and better coverage.
Danilo B. T. Almeida   +6 more
doaj   +1 more source

Hexagonal QAM-Based Four-Dimensional AMO-OFDM for Spectrally Efficient Optical Access Network Transmission

open access: yesIEEE Access, 2019
A novel spectrally efficient optical transmission in a passive optical network (PON) with hexagonal quadrature amplitude modulation (QAM)-based adaptive modulated optical (AMO) orthogonal frequency division multiplexing (OFDM) is proposed and ...
Hyoung Joon Park   +3 more
doaj   +1 more source

Chaperonin activity modulates codon adaptation

open access: yesMolecular Systems Biology, 2010
Mol Syst Biol. 6: 6 Since the discovery of the genetic code by Holley, Khorana, and Nirenberg, researchers have been fascinated by the apparent redundancy of synonymous codons that code for the same amino acid. Subsequent work led to the discovery that synonymous codons are not used randomly in coding sequences.
Sangjo Han, Philip M Kim
openaire   +3 more sources

Upper-Bound Performance of a Wide-Band Adaptive Modem

open access: yes, 1999
Adaptive modulation is applied in conjunction with a decision-feedback equalizer (DFE) in order to mitigate the effects of the slowly varying wide-band multipath Rayleigh fading channel in a noise-limited environment.
Hanzo, L., Wong, C.H.
core   +2 more sources

AAMS: Application-Aware MCS Selection With Mode Switching for QoE-Driven Large-Scale Media Transmission in 6G Mobile Networks

open access: yesIEEE Access
Large-scale media data, such as 3D point cloud videos, have received increasing attention as a key content type for 6G mobile communication services. When delivering large-scale media in real time, it is necessary to transmit high-resolution data to meet
Somin Park   +4 more
doaj   +1 more source

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