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Unformatted text preview: −2గ/ௐ −1 =0 3. Consider an OFDM transmission system with 8 tones and cyclic prefix of length 2 over the following communication channel. ݕሾ݊ሿ = ݔሾ݊ሿ + 0.5 ݔሾ݊ − 1ሿ − 0.25 ݔሾ݊ − 2ሿ + ݖ[݊] In which z[n] is a zero mean white Gaussian noise with variance N . Assume 1ܯܪݖ available bandwidth. Find the average SER for ܴܵܰ ± ܧ ௌ /ܰ ± 10݀ܤ, 15݀ܤ, 20݀ܤ in each of the following cases and plot SER versus SNR for each signaling format in (a) to (c). a) BPSK signaling on each tone and constant transmit power. b) QPSK signaling on each tone and constant transmit power. c) BPSK signaling and power is transmitted only on half of the tones that have higher SNR. (A form of adaptive modulation.)...
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This note was uploaded on 04/03/2010 for the course EE 564 at USC.