About 14 results
|A multi-beam transmitting and receiving apparatus in a wireless communication |
system includes a plurality of transmitting beam forming units (200) for forming
timely-divided multiple beams, each of the timely-divided ...
|The present invention relates to a system and method of reusing radio resources |
capable of improving radio resource efficiency. According to an embodiment of
the present invention, in a communication system including a repeater that
retransmits signals transmitted from a satellite to user terminals, it is ...
|Provided is an antenna control apparatus for controlling an antenna mounted on |
a stratospheric platform of the stratospheric communication system. The
apparatus includes a plurality of location signal receivers, each receiver being
positioned at each of predefined different points of the stratospheric ...
|A hexagonal array structure of a dielectric rod for shaping a flat-topped element |
pattern (FTEP) is provided. The hexagonal structure of dielectric rods forming a
flat-topped element pattern (FTEP) includes: a center element for forming a unit
radiation pattern of the FTEP through an electromagnetic wave ...
|Provided is a device for tracking polarizations. A receiving polarization tracking |
device includes a feeder for finding vertical and horizontal vector components by
receiving vertical and horizontal polarizations, a polarization estimator for
estimating distortion of polarizations using the vertical and horizontal ...
|Provided is a device for shaping a flat-topped element pattern using a circular |
polarization microstrip patch. The device includes: a microstrip patch feeding unit
for generating circularly polarized signals of a basic mode; a circular waveguide
for guiding the circular polarized signals and generating signals of ...
|Disclosed are a non geostationary satellite orbit (NGSO) communication |
apparatus that extends an operation time using an ancillary territory component (
ATC) and reduces a number of satellites, and an ATC and an operating method
thereof. The NGSO communication apparatus for extending an operation ...
|Provided is a method for adaptive transmit power allocation in a multiuser OFDM |
system. The method includes: a) obtaining a channel gain for a predetermined bit
period for each user at a predetermined time, and allocating all of available sub
carriers to a user farthest separated among a plurality of users ...
|Multi-beam transmitting and receiving apparatus. US 20090225740 A1. Abstract. |
|A fast LUT predistortion apparatus and method for compensating nonlinear |
distortion of the high power amplifier HPA is disclosed. The apparatus includes a
predistortion unit for predistorting an input complex digital signal based on a look
up table LUT implementation and outputting a predistorted complex ...