  Z-complementary code set (ZCCS) are well known to be used in multicarrier
code-division multiple access (MCCDMA) system to provide a interference free
environment. Based on the existing literature, the direct construction of
optimal ZCCSs are limited to its length. In this paper, we are interested in
constructing optimal ZCCSs of all possible even lengths using Pseudo-Boolean
functions. The maximum column sequence peakto-man envelop power ratio (PMEPR)
of the proposed ZCCSs is upper-bounded by two, which may give an extra benefit
in managing PMEPR in an ZCCS based MC-CDMA system, as well as the ability to
handle a large number of users.
