White noise The noise spectrum is flat over all relevant frequencies White light contains all frequencies N/2 Notice that the total power over the entire frequency range is infinite But in practice we only care about the noise content within the signal bandwidth as the rest can be filtered out After filtering the only remaining noise power is that contained within the filter bandwidth B) PBP(f) N/2 B BWhite noise • The noise spectrum is flat over all relevant frequencies – White light contains all frequencies Sn(f) No/2 • Notice that the total power over the entire frequency range is infinite – But in practice we only care about the noise content within the signal bandwidth, as the rest can be filtered out • After filtering the only remaining noise power is that contained within the filter bandwidth (B) Eytan Modiano SBP(f) No/2 fc No/2 -fc Slide 5 B B