Filters








5,909 Hits in 5.0 sec

Non-uniform Information Transmission for Minimum Distortion in Wireless Networks [chapter]

Tongtong Li, Huahui Wang, Jian Ren
2006 Lecture Notes in Computer Science  
The simplicity and power efficiency of the proposed source-aware non-uniform information scheme make it particularly attractive for systems with tight power constraints, such as wireless sensor networks  ...  Secondly, we propose a novel source-aware information transmission approach by exploiting the non-uniformity in Gray-coded constellations.  ...  design for minimum distortion, as well as non-uniform transmission based on Gray-coded constellations.  ... 
doi:10.1007/11814856_38 fatcat:fn6gddh4ungjhdscinvpfexz34

Cooperative OFDM Underwater Acoustic Communications with Limited Feedback: Part I

Qian Song, Mercedes Garcia
2012 International Journal of Computer Applications  
Cooperative communications have been proved to be a promising technique in next generation wireless communication and network system.  ...  General Terms Wireless communications and signal processing Keywords Cooperative communications, minimum error rate criterion, power allocation, limited feedback, Lloyd algorithm.  ...  AF Cooperative Relay Model A cooperative communications strategy with two phases is considered for wireless communications and networks.  ... 
doi:10.5120/8654-2576 fatcat:jzl3v6ak6rchdmloflyjyyixqa

LEACH–V: A Solution for Intra-Cluster Cooperative Communication in Wireless Sensor Network

Tapaswini Samant, Proshikshya Mukherjee, Amrit Mukherjee, Tanmaya Swain, Amlan Datta
2016 Indian Journal of Science and Technology  
Objectives: A Wireless Sensor Network (WSN) plays an important role in the future wireless communication domain because of its properties, which includes intelligence, cheaper and smaller in size.  ...  With the wireless interfaces, these can communicate with each other in case of cooperative communication in a single or multiple networks.  ...  This process will occur for the non-Cluster Head nodes. This procedure is shown in Figure 2 .  ... 
doi:10.17485/ijst/2016/v9i48/100619 fatcat:2r3gynsa2rb4tcg4sdtpbwfwam

Maximal Lifetime Rate and Power Allocation for Sensor Networks with Data Distortion Constraints

J. C. F. Li, S. Dey, J. Evans
2007 2007 IEEE International Conference on Communications  
While the constrained non-linear optimization problems for the TDMA and the Gaussian multiaccess cases are convex, the NOMA case results in a non-linear nonconvex D.C.  ...  Extensive numerical studies are presented for both static and slow fading wireless environments with full channel state information at the fusion centre.  ...  PROBLEM FORMULATION The wireless sensor network considered in this paper is presented in Figure 1 where multiple sensor nodes or agents send their information to a fusion centre (FC) via wireless links  ... 
doi:10.1109/icc.2007.606 dblp:conf/icc/LiDE07 fatcat:2lijy64wfragxe3em3rjxls6ly

NON-UNIFORM DISCRETE ECG REPRESENTATION OPTIMISED FOR MEDICAL DATA FIDELITY

PIOTR AUGUSTYNIAK
2005 Advances in Electrocardiology 2004  
Our approach consists in the automatic on-line record evaluation aiming at extracting the local density of medical information followed by re-sampling of gathered data stream to a non-uniform representation  ...  For the implementation of ECGdedicated data optimization algorithm we apply continuous non-uniform sampling providing best compromise of data density and quality.  ...  Such networks using wireless communication channels for an ubiquitous monitoring of vital parameters have several advantages over the traditional long-term recording systems: The alternative approach proposed  ... 
doi:10.1142/9789812702234_0177 fatcat:zhi4gkpgbfddpmmiwvy6nkqfwm

On the Optimal Performance in Asymmetric Gaussian Wireless Sensor Networks With Fading

Hamid Behroozi, Fady Alajaji, Tamás Linder
2010 IEEE Transactions on Signal Processing  
In a recent work Gastpar, ["Uncoded transmission is exactly optimal for a Simple Gaussian Sensor Network," IEEE Trans. Inf.  ...  Index Terms-Gaussian multiple access channel with fading, joint source-channel coding, power-distortion tradeoff, remote source coding, sensor networks, uncoded transmission.  ...  The minimum achievable distortion under a sum-power constraint for the uncoded transmission scheme in the WSN with deterministic fading is presented in [6] .  ... 
doi:10.1109/tsp.2010.2040666 fatcat:7gp5xhenk5dlletjkdqkewev3y

Optimized Video Multicasting Over Wireless Ad Hoc Networks Using Distributed Algorithm

Yifeng He, I. Lee, Ling Guan
2009 IEEE transactions on circuits and systems for video technology (Print)  
In this paper, we propose an optimized video multicast scheme over wireless ad hoc networks.  ...  The distributed nature of the proposed algorithm makes it very appropriate for wireless ad hoc networks.  ...  the parameters for transmission distortion.  ... 
doi:10.1109/tcsvt.2009.2017307 fatcat:t7zsx2mxifbmfnam4t7t4w656q

Minimum Distortion Variance Concatenated Block Codes for Embedded Source Transmission [article]

Suayb S. Arslan
2014 arXiv   pre-print
More specifically, an extension scheme is proposed using a minimum distortion variance optimization criterion. This robust system design is tested for an image transmission scenario.  ...  To provide an efficient protection for embedded source bit streams, a concatenated block coding scheme using a minimum mean distortion criterion was considered in the past.  ...  First of all, in the original coding scheme, some of the information block sizes (optimized for minimum distortion) might be very large.  ... 
arXiv:1210.2815v2 fatcat:v5hvaud6zfaxfdbyixia3ume7i

A Feasibility Study On C-RAN

Thrishna S, Dr. Anto Sahaya Dhas
2018 Zenodo  
Now a days the number of users of mobile phone are increasing exponentially, so it will cause jamming in the network and require large bandwidth So among promising technology candidates to overcome this  ...  problem, cloud radio access network (C-RAN) used.  ...  Both non-uniform quantization and noise shaping reduce one bit in word length for similar BER performance.  ... 
doi:10.5281/zenodo.1492961 fatcat:mknkhoayn5gsvguk6b6mpi6v64

Image Transmission over Noisy Wireless Channels Using HQAM and Median Filter

Md. Abdul Kader, Farid Ghani, R. Badlishah Ahmad
2013 International Journal of Information and Electronics Engineering  
This paper considers the use of unequal error protection and median filtering for transmission of images over poor wireless channels usually encountered over cellular mobile networks.  ...  In HQAM, non-uniform signal constellation is used to provide different degrees of protection to the significant and non-significant bits in the image data at lower channel Signal to Noise Ratio (SNR).  ...  This is a simple and efficient approach in which non-uniform signal-constellation is used to give different degrees of protection to the transmitted bits.  ... 
doi:10.7763/ijiee.2013.v3.371 fatcat:l4wmsd6jl5gh5igztz5ch7timq

Capacity Deficit in Mobile Wireless Ad Hoc Networks Due to Geographic Routing Overheads

N. Bisnik, A. A. Abouzeid
2007 IEEE INFOCOM 2007 - 26th IEEE International Conference on Computer Communications  
In this paper we use an information-theoretic approach for characterizing the minimum routing overheads of geographic routing in a mobile network.  ...  Overheads incurred by routing protocols diminish the capacity available for relaying useful data over a mobile wireless ad hoc network.  ...  We compare the minimum geographic routing overhead with the transport capacity of multihop wireless networks evaluated in [8] .  ... 
doi:10.1109/infcom.2007.67 dblp:conf/infocom/BisnikA07 fatcat:ksxyljj3bvdo7luf5kswq4sylu

Streaming Multimedia over Wireless Mesh Networks

David Q. LIU, Jason BAKER
2008 International Journal of Communications, Network and System Sciences  
However, WMNs pose several difficulties in the transmission of information, especially time critical applications such as streaming video and audio.  ...  Wireless mesh network (WMN) research is an emerging field in network communications.  ...  For [10] -we once more only consider the distributed collaborative -it appears to have an ordered but non-uniform smoothness.  ... 
doi:10.4236/ijcns.2008.12022 fatcat:nq4hn6h54jg4tk7zvnroydkmqm

Hierarchical Quadrature Amplitude Modulation for Image Transmission over Erroneous Wireless Channels

Md. Abdul Kader, Farid Ghani, R. Badlishah
2011 Energy Procedia  
This paper examines the suitability of Hierarchical QAM (HQAM) where non-uniform signal constellation is used to provide different degrees of protection to the significant and nonsignificant bits in the  ...  Bit dependency of image compression algorithms introduce error extension effects in transmission of compressed images and considerably reduce the received image quality.  ...  Another problem unique to wireless networks is the extremely hostile and random nature of the channels that introduce distortion and considerably degrades the image quality.  ... 
doi:10.1016/j.egypro.2011.11.309 fatcat:olxqmbt7pzbjzcfz2rdba4voea

Cross-layer design for resource allocation in 3G wireless networks and beyond

Hai Jiang, Weihua Zhuang, Xuemin Shen
2005 IEEE Communications Magazine  
in the thirdgeneration wireless networks and beyond.  ...  The minimum service rate and tight delay bound guaranteed in GPS may seem attractive to realtime video transmission.  ... 
doi:10.1109/mcom.2005.1561929 fatcat:5btct3r5afgyto4qhta62a2oba

Optimal rate allocation in progressive joint source-channel coding for image transmission over CDMA networks

Jianping Hua, Zixiang Xiong
2003 2003 International Conference on Multimedia and Expo. ICME '03. Proceedings (Cat. No.03TH8698)  
This paper presents an optimal rate allocation scheme in joint sourcechannel coding (JSCC) for image transmission over CDMA networks.  ...  Progressive JSCC offers the scalability feature that is very attractive for handling bandwidth variations in wireless communications.  ...  In this paper, we present a practical scheme for optimal rate allocation in JSCC for image transmission over CDMA networks.  ... 
doi:10.1109/icme.2003.1221004 dblp:conf/icmcs/HuaX03 fatcat:l3petgx6nvfmfakk5cyvzmhpyu
« Previous Showing results 1 — 15 out of 5,909 results