  In this paper, we propose a novel solution that can improve the quality of
THz transmission with systematic random linear network coding (sRLNC) and a
low-bitrate auxiliary channel. To minimize complexity of channel coding, we
complement a generic low complexity FEC code by a low complexity sRLNC. To
increase the overall throughput of THz transmission, we propose to send the
native data and coding redundancy in parallel over 2 differently configured THz
channels, i.e., over 1 high bit rate main channel and 1 low bit rate low error
rate auxiliary channel. The results show, that the main THz channel supported
by low bit rate auxiliary channel can use a higher level modulation format and
sent over longer distances with a higher throughput.
