公开(公告)号：US20170149550A1

公开(公告)日：2017-05-25

申请号：US15421799

申请日：2017-02-01

Applicant: SOLiD, INC.

Inventor： Jaehun CHOI

IPC: H04L5/14 ,  H04B7/0413

CPC classification number: H04L5/14 ,  H04B7/024 ,  H04B7/0413

Abstract: According to an aspect of the inventive concept, there is provided a master unit included in a distributed antenna system of a frequency division duplex scheme, includes: a frequency converting unit converting a frequency of a first signal received from a base station into a predetermined frequency to generate a first frequency conversion signal; a signal combining unit combining the first frequency conversion signal and a second signal received from the base station to generate a transmit signal; and a signal transmitting/receiving unit transmitting the transmit signal to a remote unit connected through a single transmission line.

公开(公告)号：US20180191304A1

公开(公告)日：2018-07-05

申请号：US15540682

申请日：2015-12-30

Applicant: SOLiD, INC.

Inventor： Jaehun CHOI ,  Kyungeun HAN

IPC: H03D7/16 ,  H03D7/18 ,  H04B1/30

CPC classification number: H03D7/16 ,  H03D7/161 ,  H03D7/18 ,  H04B1/30

Abstract: According to an embodiment of the inventive concept, an up-down converter includes a first mixer configured to convert an input radio frequency (RF) signal into an intermediate frequency (IF) signal using a first local signal; an IF filter configured to filter the IF signal converted by the first mixer; a second mixer configured to convert the IF signal, which has been filtered by the IF filter, into an output RF signal using a second local signal; and a local oscillator configured to control a frequency of the first local signal and the second local signal based on a frequency of the input RF signal.