Patent ID: 7817566

Claim:
A wired link tester apparatus, comprising: a simulating unit for constructing a wired link corresponding to a wireless link for a multiple-input multiple-output system and simulating wireless-link characteristics using each variable element located on the wired link; wherein the simulating unit includes: a path loss simulator for simulating the path-loss characteristics of a Radio Frequency (RF) signal of each transmitting antenna by disposing a first variable element on the wired link; and a fast fading simulator for simulating fast-fading characteristics by constructing a wired link such that an RF signal of each transmitting antenna is received at all the receiving antennas, and disposing a second variable element on the wired link; wherein the first variable element includes a first variable attenuator and the second variable element includes a second variable attenuator and a variable phase shifter; and a control unit for prestoring a predetermined value of each variable element depending on a state change time and a number of state changes and controlling each variable element according to the predetermined value of each variable element.