GEL7114 - Module 2.12 - Raised Cosine pulses

GEL7114
Digital Communications
Leslie A. Rusch
Université Laval
ECE Dept.
Module 2 gives a precise receiver structure and develops signal space analysis to quantify performance of the receiver.
In PartA of Module 2 we optimize performance by appropriate choices for various receiver blocks. We introduce the MAP and ML optimization criteria, including likelihood and a priori probabilities. We define the matched filter. We introduce signal space and use the Gram-Schmidt to find an example signal space basis.
In PartB of Module 2 we quantify the bit error rate of a binary system using signal space analysis. We examine both BPSK and OOK. Finally, we introduce Nyquist pulses to avoid ISI. We use the raised cosine pulse in a practical exercise.

[@theoryandapplication7197]

thank you very much

[@bstanis1237]

Thanks a lot Prof. Leslie;
Please, I have very interesting question, I'll so appreciative to you if you have precise answer for it,
the question is about how we can theoretically calculate the cut of frequency of the raised cosine filter for OFDM signal (pulse shaping) before driving the IQ modulator for frequency upconversion from baseband to RF carrier?
Please, I'm so need your help about that from your experience and deep knowledge in this regard.
thank a lot :)

[@homemdosaco2000]

Dr. Rusch, is the srrc filter applicable to passband modulation?
If so, where would it fit in a practical qam modulation scheme with I and Q vector basis?
Thanks again fo your content.

[@rishabhsrivastava1241]

It is indeed passband filtering. It is applied just after you create IQ signals. Imagine DPSK signalling wherein you modulate cos and sine components with the bit variations. Post which you may need srrc to limit sudden variations in the phase of IQ signal