  The problem of projective synchronization(ps) and control are studied in
modified unified chaotic system which possess partially linearity property. The
desired ratio factor of corresponding subsystem variable could be obtained by
state feedback control. Theoretical analysis and numerical simulations are
provided to illustrate the projective synchronization and the feasibility of
the proposed control method. The effect on projective synchronization caused by
channel noise and parameter mismatch are investigated in detail, the results
showed that parameter mismatch has more effect on projective synchronization
than channel noise does, which may be applied to chaotic secure communications.
