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root raised cosine filter

EngrZM

hi

can any one guide where can i get the help documentation for "root raised cosine" filter setting and parameters (rflib >> root raised cosine filter). OR any other resource that may help to understand its parameters. 

Thanks 

  • Andrew Beckett

    One of my colleagues dealt with a similar question, and raised CCR 1220613 to get the documentation improved. He found this information, although I can't vouch for its accuracy (I didn't check):

    The group delay is decided by the number of taps. So, the greater the group delay, you will get better filter characteristics, for
example, smaller passband ripple, greater stopband attenuation. Of course, larger group delay will bring about larger end-to-end
transmission delay of the link.

alpha should be the roll-off factor

Frame_time: I think this property sets the total time of each packet

Oversample: Controls the sampling frequency.

The numChipsOut means that one data symbol will be spreaded by the number of chips. For example, in WCDMA it has the value 256 as
it shows here:

http://support.cadence.com/wps/PA_DocumentViewer/pubs//rflibrary/rflibrary12.1/chap1.html

I found online the following information at Wikipedia:

http://en.wikipedia.org/wiki/Root-raised-cosine_filter
http://en.wikipedia.org/wiki/Raised-cosine_filter

    Hopefully that will help - if not, I suggest contacting customer support and requesting a duplicate CCR to the one I mentioned above.

    Regards,

    Andrew.

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