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103
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ICC
2007
IEEE
15 years 9 months ago
2007
IEEE
— In orthogonal frequency-division multiplex access (OFDMA) systems, including uplink and downlink, the carrierfrequency offset (CFO) between the multiple transceivers introduces...
94
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VTC
2006
IEEE
15 years 8 months ago
2006
IEEE
In this paper, two channel estimation schemes for OFDM systems are investigated in a time-variant channel. The orthogonality of the subcarriers is destroyed in a time-variant chann...
117
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VTC
2010
IEEE
15 years 1 months ago
2010
IEEE
—We study the design of training-based multiple-input multiple-output systems in two block-wise transmission schemes. The conventional transmission scheme has a fixed amount of ...
110
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KI
2005
Springer
15 years 8 months ago
2005
Springer
In this paper we present a highly modular planning system architecture. It is based on a proper formal account of hybrid planning, which allows for the formal definition of (flex...
135
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ICWE
2003
Springer
15 years 7 months ago
2003
Springer
This paper presents a framework for the integration of web-based educational systems. It is part of a research project, MEDEA1 , whose final goal is to develop a general framework ...