Results 221 to 230 of about 17,311 (265)
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Optimal co-phasing power allocation for coordinated OFDM transmission
2017 IEEE International Conference on Communications (ICC), 2017This paper considers an orthogonal frequency division multiplexing (OFDM) coordinated transmission system in which K coordinated transmission points (CTPs) coherently transmit and allocate power across N subchannels under individual power constraints. In maximizing the system capacity, we derive an optimal co-phasing power allocation solution with the ...
Bing Luo 0002 +2 more
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Alpha/Gamma equilibria in the Fe-Co phase diagram
JOM, 2000It is possible to treat the equilibrium between α and γ phases and obtain a good representation of the phase boundaries in the Fe-Co system using the cluster variation method. In this study, calculations were performed on quaternary Fe+Fe-Co+Co- by considering both chemical and magnetic interactions.
C. Colinet, A. Antoni-Zdziobek
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An active co-phasing imaging testbed with segmented mirrors
SPIE Proceedings, 2011An active co-phasing imaging testbed with high accurate optical adjustment and control in nanometer scale was set up to validate the algorithms of piston and tip-tilt error sensing and real-time adjusting. Modularization design was adopted. The primary mirror was spherical and divided into three sub-mirrors.
Weirui Zhao, Genrui Cao
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Co-Phasing And Co-Aligning The Multiple Mirror Telescope
SPIE Proceedings, 1987The Multiple Mirror Telescope is an array of six 1.8 m diameter folded Cassegrain telescopes used to achieve the collecting area equivalent to that of a telescope with a single 4.5 m primary mirror. For most applications, the six images are co-aligned in such a way that overlapping images appear to result from a single telescope.
C. C. Janes, J. W. Montgomery
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Co-phasing segmented surfaces using the geometric sensor
2013 12th Workshop on Information Optics (WIO), 2013This paper presents a method to co-phase segmented mirror. For this purpose, we use the geometric sensor, thus only two defocused images are acquired. The van Dam and Lane algorithm [1] is applied to obtain the tip-tilt in every segment, and a new method is used to restore the original local piston.
J. J. Fernandez-Valdivia +3 more
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The research on electric method for testing co-phasing error
SPIE Proceedings, 2007The primary mirror's aperture limits the telescope's resolution. A segmented primary mirror is adopted to improve the resolution. Since the primary mirror with large diameter is segmented, the segmented mirrors must be co-phased to ensure the imaging quality. Optical method and electrics method can be used to test the co-phasing error between the two
Weirui Zhao, Genrui Cao
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Co-phase continuity in immiscible binary polymer blends
Polymer, 1997Abstract Methods of microscopic observation and macroscopic characterization have been developed for determining the co-phase continuity in immiscible binary blends. After selective dissolution of the component polymers, the morphologies of microscopic observation are consistent with the results of macroscopic observation and weight percentage ...
Jiasong He, Wensheng Bu, Jijun Zeng
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Design of co-phasing allpass filters for full-duplex OFDM relays
2008 42nd Asilomar Conference on Signals, Systems and Computers, 2008This paper studies amplify-and-forward relaying of OFDM signals. In the considered cellular hotspot scenario, a destination node receives superposition of single-hop transmission from a source node and two-hop transmissions via full-duplex relays.
Taneli Riihonen +3 more
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Co-phasing full-duplex relay link with non-ideal feedback information
2008 IEEE International Symposium on Wireless Communication Systems, 2008We study a wireless full-duplex amplify-and-forward relay link where a destination receives superposition of relayed and direct signals. We propose a new relay protocol that performs co-phasing of the two paths. We analyze the performance of the relay link by calculating closed-form expressions for the average end-to-end signal-to-noise ratio assuming ...
Taneli Riihonen +2 more
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Co-phase error correction of the optical sparse aperture system
SPIE Proceedings, 2009Optical sparse-aperture system can be designed to obtain high resolution in astronomical object imaging with several independent small-aperture telescopes. However, the images from separated telescopes are not only overlapped but also have same phase.
Dayong Wang +3 more
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