Define power spectral density and bandwidth efficiency. Explain their

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Module 2: Digital Modulation

20257m

Define power spectral density and bandwidth efficiency. Explain their importance in digital modulation.

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PSD $S(f)$ : Power per Hz $P=\int S(f)df$ , via autocorrelation $R(\tau)$ . White $N_0/2$ flat, BPSK sinc. $\eta=R_b/B$ bps/Hz, Nyquist $\le2\log_2M$ , Shannon $\le\log_2(1+SNR)$ . PSD guides interference/filter, $\eta$ measures efficiency. Trade higher $\eta$ needs more power.

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