نتایج جستجو برای: Channel polarization

تعداد نتایج: 288464  

Polar codes, that have been recently introduced by Arikan, are one of the first codes that achieved the capacity for vast numerous channels and they also have low complexity in symmetric memoryless channels. Polar codes are constructed based on a phenomenon called channel polarization. This paper discusses relay channel polarization in order to achieve the capacity and show that if inputs of tw...

Journal: :iranian journal of hydrogen and fuel cell 0
ashkan torkavannejad urmia university nader pourmahmoud urmia university

to simulate a new economical architecture for pem fuel cell and investigate the effectiveness of the introduced structure on the performance, computational fluid dynamics (cfd) code is used to solve the equations for a single domain of the cell namely: the flow field, the mass conservation, the energy conservation, the species transport, and the electric/ionic fields under the assumptions of st...

To simulate a new economical architecture for PEM fuel cell and investigate the effectiveness of the introduced structure on the performance, computational fluid dynamics (CFD) code is used to solve the equations for a single domain of the cell namely: the flow field, the mass conservation, the energy conservation, the species transport, and the electric/ionic fields under the assumptions of st...

Journal: :Optics express 2004
Chang-Seok Kim Young-Geun Han Jin Kang Bernard Choi J Nelson

Novel multi-wavelength switching filters based on cascaded long-period fiber gratings and polarization-maintaining fiber in a Sagnac loop configuration are proposed and experimentally demonstrated. The rapid wavelength switching is achieved by an electro-optic polarization controller. The device is independent of the polarization state of the input light due to the bi-directional polarization c...

2009
Yohei Konishi Lawrence Materum Mir Ghoraishi Jun-ichi Takada Ichirou Ida Yasuyuki Oishi

This paper presents clusterwise polarization characteristics taken from an estimated MIMO channel of a small urban macrocell at 4.5 GHz. Polarization path gain, cross-polarization ratio, and co-polarization ratio characteristics as influenced by channel parameters such as delay, azimuth and elevation angle of arrival were investigated. The results showed that polarization characteristics were a...

2012
AMANDEEP KAUR

In this paper, the polarization mode dispersion in eight channel WDM system is evaluated by considering one even channel and one odd channel performance parameters like BER and Q-factor. As PMD effects transmission at high bit rates so it is compensated with the help of dispersion compensating fibre at different distances by controlling the polarising angle with the help of polarization control...

Journal: :CoRR 2017
Yeon-Geun Lim Yae Jee Cho TaeckKeun Oh Yongshik Lee Chan-Byoung Chae

In this letter, we present a correlated channel model for a dual-polarization antenna to omnidirectional antennas in indoor small-cell multiple-input multiple-output (MIMO) systems. In an indoor environment, we confirm that the cross-polarization discrimination (XPD) in the direction of angle-of-departure can be represented as the spatial correlation of the MIMO channel. We also evaluate a dual...

2016
Qiuming Zhu Cuiwei Xue Xiaomin Chen Ying Yang

Antenna characteristics including mutual coupling and polarization/depolarization have great effects on the performance of Multiple-input multiple-output (MIMO) system. In this paper, new close-form expressions of signal vector, signal power and signal correlation incorporating mutual coupling and polarization/depolarization are derived firstly. On this basis, we present a new MIMO channel mode...

Journal: :CoRR 2013
Kai Chen Kai Niu Jiaru Lin

The polar codes are proven to be capacity-achieving and are shown to have equivalent or even better finite-length performance than the turbo/LDPC codes under some improved decoding algorithms over the additive white Gaussian noise (AWGN) channels. Polar coding is based on the so-called channel polarization phenomenon induced by a transform over the underlying binary-input channel. The channel p...

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