公开(公告)号：US11005641B2

公开(公告)日：2021-05-11

申请号：US15421799

申请日：2017-02-01

申请人： SOLiD, INC.

发明人： Jaehun Choi

IPC分类号： H04L5/14 ,  H04B7/024 ,  H04B7/0413

摘要： 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：US10312862B2

公开(公告)日：2019-06-04

申请号：US15540682

申请日：2015-12-30

申请人： SOLiD, INC.

发明人： Jaehun Choi ,  Kyungeun Han

IPC分类号： H03D7/16 ,  H03D7/18 ,  H04B1/30

摘要： 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.