Re: Raised Cosine
Hey Guys,
I dont know It wud be helpful or not but JUST GO THROUGH THIS AND SEE!!
I have been doing research on raised cosine pulses and the answers to ur questions are
(1) the raised cosine pulse that we use is causal as only haalf of the pulse is used for pulse shaping. Moreover,it is common engineering practice to split the pulse in half, i.e., to deploy a root (of the frequency response) pulse at the transmitter side, and the same root pulse at the receiver side that acts as a matched filter . Further, the filters are digitally implemented with a truncated oversampled causal version. For complexity reasons it is desirable that the tails decay rapidly
in order to allow quick truncation, and minimize the resulting intersymbol interference (ISI) at the receiver. This is because the auto-convolution of the truncated root pulse is not Nyquist anymore.
(2) The complete assembly o fwat u call a raised cosine filter is given by the eqn,
H(tx)*H(rx)=H(RC)!!
cheers!