  A joint scheme for the channel coding and spectrum spreading communication
system is proposed in this paper. The Bit Error Rate (BER) performance of the
joint proposed scheme is evaluated and compared with the case of channel coding
scheme without spectrum spreading. We employ a single Low-Density Parity Check
(LDPC) code for the both channel coding and direct sequence spectrum spreading.
We show that the BER performance is significantly improved while the complexity
does not increase too. The philosophy behind this achievement is that the
spectrum spreading techniques provide the ability of channel noise protection
for the communication systems by themselves.
