Abstract: A technology for modulating and demodulating a burst signal in a return link of a satellite system, in which the burst signal is modulated and transmitted from a transmission end of the return link and a symbol of the burst signal is identified and demodulated at a receiving end. The method includes estimating symbol timing of a burst received through the return link and synchronizing the estimated symbol timing of the burst to reference symbol timing; synchronizing a location of the timing-synchronized burst having the symbol timing synchronized to a location of a reference burst using a preamble symbol and a post-amble symbol of the timing-synchronized burst; and recovering a carrier of the location-synchronized burst whose location has been synchronized to the location of the reference burst using a pilot symbol of the location-synchronized burst.
Type:
Application
Filed:
December 8, 2011
Publication date:
June 14, 2012
Applicant:
ELECTRONICS AND TELECOMMUNICATIONS INSTITUTE
Inventors:
Jae-Hee HAN, Pan-Soo Kim, Deock-Gil Oh, Xavier Giraud
Abstract: A multi-user scheduling method and apparatus in a Multiple-Input Multiple-Output (MIMO) system are disclosed. The multi-user scheduling method includes calculating a valid channel norm based on statistical characteristics of a channel for every user terminal, selecting a user set that maximizes the sum of valid channel norms and that includes as many user terminals as data are transmittable to simultaneously, and precoding transmission signals for the user terminals included in the user set according to a predetermined scheme. According to the present invention, the volume of computation required for multi-user selection is reduced greatly, thus making real-time implementation possible.
Type:
Application
Filed:
September 18, 2009
Publication date:
October 21, 2010
Applicant:
ELECTRONICS AND TELECOMMUNICATIONS INSTITUTE