Efficient digital filter for QPSk

[somik13]

I want to design a efficient filter for QPSk in Matlab's simulink DSP block set. I know that i need upsampler+LPF+Interpolation filter but i am looking for such a filter which can do all thses together. Is it possible? If yes or not, please suggest me and give me some IEEE paper where i can get the design. Thanks in advance.

 

[cheggy]

You may use "rised cosine" filter from MATLAB, there are only two functions that you need to do the job (as I remmember, main is "rcosine", look at Help ). In Simulink there's Filter Design tool, just specify "rised cosine" filter with appropriate roll-off factor. And, yes, this function supposes that you perform upsampling before filtering - which means simply to insert zeros between samples.

That's all, no any further interpolation is needed! Check out examples on "rised cosine" filtering in MATLAB Help !