This paper proposes a bandwidth division type parallel combinatory (PC) spr
ead spectrum (SS) modulation scheme. In the proposed system, a given system
bandwidth for the conventional single-carrier PC-SS system is divided into
H subbands, and H PC-SS signals are transmitted in parallel, We evaluate t
he frame error rate (FER) of the proposed system under the asynchronous CDM
A environment. We show that the proposed scheme provides a smaller FER than
the single-carrier PC-SS system for a given information bit rate. We also
show that the proposed scheme attains a higher information bit rate than th
e single-carrier PC-SS system for a given FER.