IQ modulator &upconvertor(AD9857)

I am working on AD9857 which copmrises an IQ modulator and in fact is a
quadrature up convertor Using 14 bits I Q input data , I want
to try out various modulation schemes like AM, FSK,FM,BPSK,GMSK, QPSK and
QAM. I`ve tried IQ modulation in different (analogue) shchemes with MATLAB
using IQ in form of analog signals . I would like some help on
simulation of the quad modlr block with MATLAB codes, which produces 14
bit IQ signals in those diffrent modulation before feeding 9857 usings DSP
processor. Can anybody help me? or even guide me with matlab codes? 

   Thanks ............NIKI