Abstract:
This paper presents a simulation study for code-division multiplex system over time
varying channels. The scheme investigated here uses a precoding technique in the
transmitter depending on the channel information, so that no need for any signal
processing in the receiver rather than testing against a certain threshold. This coding
technique minimizes the effect of intersymbol interference (ISI). The data itself is
transmitted in the form of blocks of data symbols separated by blocks of no signal. The
appropriate length of each data block depends on the channel parameters expected and
the allowed complexity. The impulse response is required to be known at the transmitter
which is the requirement for all systems that employ coding at the transmitter.