Results 41 to 50 of about 5,689 (160)

Adaptive Modulation and Coding With LDPC Codes and Retransmission for Ultraviolet Communication

IEEE Photonics Journal
To adapt to different transmission power and distances, we design a rate-compatible transmission protocol to realize different transmission rates for ultraviolet (UV) communication.
Fei Long, Jingyin Tang, Lingfeng Li, Jingyang Chen, Chen Gong, Zhengyuan Xu   +5 more
doaj   +1 more source

When Will You Have a New Mobile Phone? An Empirical Answer From Big Data

IEEE Access, 2016
When and why people change their mobile phones are important issues in mobile communications industry, because it will impact greatly on the marketing strategy and revenue estimation for both mobile operators and manufactures.
Qingli Ma, Sihai Zhang, Wuyang Zhou, Shui Yu, Chonggang Wang   +4 more
doaj   +1 more source

Enabling High Order SCMA Systems in Downlink Scenarios With a Serial Coding Scheme

IEEE Access, 2018
In the future fifth generation communication systems, sparse code multiple access (SCMA) shows strong competitiveness as a novel non-orthogonal multiple access (NOMA) technique. Attributing to multi-dimensional codebooks, the SCMA can obtain shaping gain
Yuxi Han, Wuyang Zhou, Ming Zhao, Shengli Zhou   +3 more
doaj   +1 more source

Network-Based Video Quality Assessment for Encrypted HTTP Adaptive Streaming

IEEE Access, 2018
End-to-end encryption brings new challenges for mobile network operators to obtain key quality indicators (KQIs) of the HTTP adaptive streaming (HAS), which are vital for quality of experience (QoE) of the end users.
Shuang Tang, Xiaowei Qin, Guo Wei
doaj   +1 more source

An Adaptive Threshold Updating Algorithm for PMT-Based Ultraviolet Communication

IEEE Photonics Journal
To address varying environmental conditions, this paper proposes an adaptive threshold updating algorithm for photomultiplier tube (PMT) signals in ultraviolet (UV) communication.
Jingyang Chen, Yuan Ren, Fei Long, Lingfeng Li, Weijie Liu, Jian Chen, Dezhi Yang, Chen Gong, Zhengyuan Xu   +8 more
doaj   +1 more source

Experimental Indoor Visible Light Positioning Systems With Centimeter Accuracy Based on a Commercial Smartphone Camera

IEEE Photonics Journal, 2018
We consider indoor positioning based on visible light where the receiver adopts a commercial smartphone camera. Two positioning approaches are proposed, either the light emitting diode (LED) positions are known or not.
Jiaojiao Xu, Chen Gong, Zhengyuan Xu
doaj   +1 more source

Experimental Verification of a Multiuser Detection Technique for Asynchronous UOWC Systems

IEEE Photonics Journal
In this paper, a multiuser detection technique is proposed and experimentally verified in underwater optical wireless communication (UOWC) under dynamic channel conditions, which incorporates subspace-based delay estimation and decorrelating multiuser ...
Weijie Liu, Xiaorui Chen, Nuo Huang, Zhengyuan Xu   +3 more
doaj   +1 more source

Information Theoretic Limits of Improved ACO-OFDM Receivers in Optical Intensity Channels With Time Dispersion

IEEE Open Journal of the Communications Society
From an information-theoretic perspective, we investigate performance of asymmetrically clipped optical OFDM (ACO-OFDM) in intensity modulated optical wireless systems.
Xiaozhen Liu, Jing Zhou, Wenyi Zhang
doaj   +1 more source

Maritime IoT: An Architectural and Radio Spectrum Perspective

IEEE Access, 2020
The concept of maritime Internet of Things is developed initially to modernize the maritime industries by the United Nations chartered International Maritime Organization under the name e-Navigation.
Jingjing Zhang, Michael Mao Wang, Tingting Xia, Lei Wang   +3 more
doaj   +1 more source

Beamforming for Combating Inter-cluster and Intra-cluster Interference in Hybrid NOMA Systems

IEEE Access, 2016
In this paper, downlink beamforming (BF) for hybrid non-orthogonal multiple access (NOMA) systems is considered, in order to combat inter and intra cluster interference.
Zhiyong Chen, Zhiguo Ding, Xuchu Dai
doaj   +1 more source