Dear Faria,
the LOS component reacts to the incoming modulated and coded signal that is created at the transmitter side. The electrical field of signal will be transmitted over the LOS channel and experience different effect depending on the signal structure. Thus, you need to create the signals then transmit them through the LOS component and monitor the differences in their performance.
There are some coding components in OptiSystem that you may use. You may also use the Matlab component to create the required code and apply it to the PRBS data.
Regards,
Ahmad
