half-sine pulse shaping

i wanted开发者_运维问答 to know what is the pulse shape of the modem.oqpskmod? and if it is not half-sine pulse shape, how is it possible to make it half-sine pulse shape as it is stated in ieee 802.15.4(zigbee) standard where it shows it as follows

    p(t)=sin(pi*t/2*Tc) if 0<=t<=2Tc
    p(t)=0 if otherwise

? thanks a lot!

Looks to me like the MATLAB modems just output the symbols and that you will need to manually upsample (zero-stuff) the symbols and apply a pulse-shaping filter of your choice to the result to get your baseband signal. There's an example here: http://www.mathworks.com/access/helpdesk/help/toolbox/comm/ug/a1067963807.html#a1068239783b1