Results 71 to 80 of about 868,591 (197)

Performance of OFDM: FSO Communication System with Hybrid Channel Codes during Weak Turbulence

open access: yesJournal of Computer Networks and Communications, 2019
The performance of orthogonal frequency division multiplexing- (OFDM-) based free-space optics (FSO) depends on various parameters such as number of subcarriers, base band modulation, nature of laser beam, turbulence modelling, and much more.
Ritu Gupta   +2 more
doaj   +1 more source

Helper Data Schemes for Coded Modulation and Shaping in Physical Unclonable Functions

open access: yesIEEE Open Journal of the Communications Society
We consider the generation and utilization of helper data for physical unclonable functions (PUFs) that provide real-valued, Gaussian distributed readout symbols.
Robert F. H. Fischer
doaj   +1 more source

Network coded modulation for two-way relaying [PDF]

open access: yes, 2011
Network coding compresses multiple traffic flows with the aid low-complexity algebraic operations, hence holds the potential of significantly improving both the power and bandwidth efficiency of wireless networks.
Chen, Wei   +5 more
core   +1 more source

Turbo-detected unequal protection audio and speech transceivers using serially concatenated convolutional codes, trellis coded modulation and space-time trellis coding

open access: yes, 2005
The MPEG-4 TwinVQ audio codec and the AMR-WB speech codec are investigated in the context of a jointly optimised turbo transceiver capable of providing unequal error protection.
Ng, S.X., Othman, N.S., Hanzo, L.
core   +1 more source

Zernike Moment-Based Spatial Image Steganography Resisting Scaling Attack and Statistic Detection

open access: yesIEEE Access, 2019
The mainstream adaptive steganography algorithm is difficult to resist scaling attack, and the anti-detection performance of the algorithm based on quantization index modulation is not high enough.
Yue Zhang   +4 more
doaj   +1 more source

Method of blind reconstruction for trellis‐coded modulation codes

open access: yesIET Communications, 2014
Since trellis‐coded modulation (TCM) was introduced, it was quickly adopted in modem standards. Unlike blind reconstruction for normal channel coding, blind reconstruction for TCM codes not only requires identifying the correct generator matrix, but also the correct type of constellation mapping. So far this has seldom been reported.
Yuxing Bo   +3 more
openaire   +2 more sources

Reduced-complexity syndrome-based TTCM decoding [PDF]

open access: yes, 2013
The iterative decoder of Turbo Trellis Coded Modulation (TTCM) exchanges extrinsic information between the constituent TCM decoders, which imposes a high computational complexity at the receiver. Therefore we conceive the syndrome-based block decoding of
Ng, Soon Xin   +2 more
core   +1 more source

Joint semi-blind detection and channel estimation in space-frequency trellis coded MIMO-OFDM [PDF]

open access: yes, 2003
This paper considers an OFDM system with a multiple-input multiple-output (MIMO) configuration, which uses space-frequency trellis coding (SFTC). A novel method of decoding SFTC without a need to transmit separate training sequences is developed.
Nix, AR, Piechocki, RJ, McGeehan, JP
core   +1 more source

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