> Christoph Bersch wrote: > Well, I just know si(x) and sinc(x) both as sin(x)/x, Me, too. > but I don't know the OFDM method. Is the integral needed there? No, at least not as I think the OP wants to use it. The integral over si(x) is often known as SI(x). And to add just a remark: sinc(x) is often normalized as sin (x\pi) / (x\pi)! Jürgen