公开(公告)号：DE60329158D1

公开(公告)日：2009-10-22

申请号：DE60329158

申请日：2003-12-22

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： RYU JOON-GYU ,  JEONG HOON ,  LEE HO-JIN ,  OH DEOCK-GIL

IPC: H04L27/34 ,  H03D7/16 ,  H04B1/04 ,  H04B1/30 ,  H04B1/713

Abstract: Disclosed is a frequency hopping system for converting frequencies of signals into RF (radio frequency) signals, which comprises: a frequency hopper (200) for outputting signals with temporarily varied frequencies according to a predetermined pattern; a fixed PLL (phase locked loop) unit (500) for outputting frequency-fixed signals; a mixer (400) for mixing the output signals of the frequency hopper and the fixed PLL unit, and outputting frequency-hopped local signals; and a modulator (100) for receiving I and Q (in-phase and quadrature-phase) signals from a baseband device, synthesizing the I and Q signals with the frequency-hopped local signals, combining the two synthesized signals, and outputting RF signals.

公开(公告)号：GB2433179B

公开(公告)日：2010-05-19

申请号：GB0624657

申请日：2006-12-11

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KIM BYOUNG-HAK ,  OH DEOCK-GIL ,  LEE HO-JIN ,  RYU JOON-GYU

IPC: H04B7/185

公开(公告)号：AT442707T

公开(公告)日：2009-09-15

申请号：AT03029648

申请日：2003-12-22

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： RYU JOON-GYU ,  JEONG HOON ,  LEE HO-JIN ,  OH DEOCK-GIL

IPC: H04L27/34 ,  H03D7/16 ,  H04B1/04 ,  H04B1/30 ,  H04B1/713

Abstract: Disclosed is a frequency hopping system for converting frequencies of signals into RF (radio frequency) signals, which comprises: a frequency hopper (200) for outputting signals with temporarily varied frequencies according to a predetermined pattern; a fixed PLL (phase locked loop) unit (500) for outputting frequency-fixed signals; a mixer (400) for mixing the output signals of the frequency hopper and the fixed PLL unit, and outputting frequency-hopped local signals; and a modulator (100) for receiving I and Q (in-phase and quadrature-phase) signals from a baseband device, synthesizing the I and Q signals with the frequency-hopped local signals, combining the two synthesized signals, and outputting RF signals.

公开(公告)号：GB2433179A

公开(公告)日：2007-06-13

申请号：GB0624657

申请日：2006-12-11

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KIM BYOUNG-HAK ,  OH DEOCK-GIL ,  LEE HO-JIN ,  RYU JOON-GYU

IPC: H04Q7/38 ,  H04B7/185

Abstract: In the invention a selector determines whether transmissions from the terminal should be direct to a satellite, or indirectly via a "gap filler" relay, the decision being made by comparing the respective link qualities. As embodied, the terminal has a Ku/Ka band antenna and signals received from the satellite are converted to S-band 303. The converted signals are then monitored 307 for S/N level and compared 308 with the S/N level of S-band signals received from the gap filler. The comparison results controls an RF switch which selects the link with the greater S/N level.