Results 31 to 40 of about 18,013 (228)

PERFORMANCE ANALYSIS OF MIMO-SPACE TIME BLOCK CODING WITH DIFFERENT MODULATION TECHNIQUES [PDF]

ICTACT Journal on Communication Technology, 2012
MIMO Diversity is the technique which takes the advantage of multipath and mitigates the effect of fading and increases signal strength. Space Time Block code (STBC) is used in Multiple Input Multiple Output (MIMO) system to improve the performance by ...
Shubhangi Chaudhary, A.J. Patil
doaj  

Phase Transparent Demultiplexer for QPSK Signal Based on Nonlinear Response in a Double-Pass Architecture

IEEE Photonics Journal, 2016
We propose and experimentally demonstrate an optical modulation format converter from a 25-Gbps quadrature phase-shift keying (QPSK) signal to two 12.5-Gbps binary phase-shift keying (BPSK) signals in a double-pass configuration, which is achieved by ...
Yu-Hsiang Wen, Jia-Wei Ho, Kai-Ming Feng
doaj   +1 more source

A Unified Theory of Intrachannel Nonlinearity in Pseudolinear Phase-Modulated Transmission

IEEE Photonics Journal, 2010
It is shown that the phase distribution of the field and the detection scheme strongly affect the strength of the nonlinear impairments in phase-modulated transmission systems.
A. Mecozzi
doaj   +1 more source

All-Optical Format Conversion for Rectangular 8QAM Signals Based on Phase-Sensitive Amplification and Nonlinear Mach-Zehnder Interferometer

IEEE Photonics Journal
An all-optical format conversion (AOFC) scheme for the input 30 Gbit/s rectangular 8-ary quadrature amplitude modulation (8QAM) signal is proposed and numerically investigated based on phase-sensitive amplification (PSA) and nonlinear Mach-Zehnder ...
Qiankun Li, Xiongwei Yang, Huashun Wen, Yameng Li, Qi Xu, Jiali Yang, Pengfei Xu, Huajun Yang   +7 more
doaj   +1 more source

Demonstrating Doubly-Differential Quadrature Phase Shift Keying in the Optical Domain [PDF]

IEEE Photonics Technology Letters, 2013
We report for the first time the experimental demonstration of doubly differential quadrature phase shift keying (DDQPSK) using optical coherent detection. This method is more robust against high frequency offsets (FO) than conventional single differential quadrature phase shift keying (SDQPSK) with offset compensation.
Walsh, Anthony J., Shams, Haymen, Mountjoy, James, Fagan, Anthony, Zhao, Jian, Barry, Liam P., Ellis, Andrew D.   +6 more
openaire   +1 more source

A Superhydrophobic 3D Cell Culture System Reveals the Mechanobiological Role of Cancer‐Associated Fibroblasts in Prostate Cancer Metastasis

Advanced Healthcare Materials, EarlyView.
A superhydrophobic 3D cell culture platform enables rapid and consistent formation of heterotypic tumor–stroma clusters, and reveals how physiological shear conditions influence metastatic signaling. Mechanical stimulation of cancer‐associated fibroblasts promotes sustained cytokine secretion and survival‐promoting pathways, showing how multicellular ...
Alexandria T. Carter, Abigail R. Fabiano, Ehsan Aalaei, Jason Deng, Dakota E. Rostant, Michael R. King   +5 more
wiley   +1 more source

Converged wireline and wireless access over a 78-km deployed fiber long-reach WDM PON [PDF]

, 2009
In this letter, we demonstrate a 78.8-km wavelength-division-multiplexing passive optical network supporting converged transport of 21.4-Gb/s nonreturn-to-zero differential quadrature phase-shift keying, optical phase-modulated 5-GHz radio-over-fiber ...
Caballero Jambrina, Antonio, Gibbon, Timothy Braidwood, Guerrero Gonzalez, Neil, Jensen, Jesper Bevensee, Osadchiy, Alexey Vladimirovich, Prince, Kamau, Tafur Monroy, Idelfonso, Yu, Xianbin, Zibar, Darko   +8 more
core   +1 more source

Design, comparative study and analysis of CDMA for different modulation techni

Egyptian Informatics Journal, 2015
In this work, we have design a MIMO–CDMA using 4 ∗ 8 antennas with the combination of MMSE (Minimum Mean square Error Equalizer) for BPSK (Binary Phase shift Keying), QPSK (Quadrature Phase Shift Keying), 16-QAM, 64-QAM and 256-QAM (Quadrature Amplitude ...
Arun Kumar, Manisha Gupta
doaj   +1 more source

Metamaterial Antennas Enhance MRI of the Eye and Occipital Brain

Advanced Materials, EarlyView.
A radiofrequency antenna platform comprising planar and bend configurations is developed, incorporating structurally integrated epsilon‐negative metamaterial unit cells to enhance MRI. These antennas enable high‐resolution in vivo human MRI of the eye, orbit, and occipital brain. Comprehensive validation, including simulations, phantom experiments, SAR,
Nandita Saha, Bilguun Nurzed, Mostafa Berangi, Andre Kuehne, Helmar Waiczies, Igor Fabian Tellez Ceja, Xiang Hu, Thomas Gladytz, Lisa Krenz, Dave Huebler, Beate Endemann, Claudia Brockmann, Ebba Beller, Oliver Stachs, Thoralf Niendorf   +14 more
wiley   +1 more source

Performance analysis of bandwidth efficient coherent modulation schemes with L-fold MRC and SC in Nakagami-m fading channels [PDF]

, 2000
This paper presents the average symbol error rates (SERs) of the 16-ary phase shift keying (16PSK), 16-ary amplitude phase shift keying (16APSK) and 16-ary quadrature amplitude modulation (16QAM) with L-fold maximal ratio combining (MRC) and selection ...
Lam, WH, Lo, CM
core   +1 more source