What is the required alphabet size for an uncoded system

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Reference no: EM131771900

Question: Suppose you are asked to design a 400 bit per second modem for a noisy bandlimited and power-limited passband channel. You determine that with reasonable excess bandwidth, a symbol rate of 100 symbol per second is possible.

(a) For an uncoded system, what is the required alphabet size? Choose a constellation.

(b) For a two-dimensional trellis coded system, what is the required alphabet size? Choose a constellation.

(c) Suppose that to get an acceptable probability of error the uncoded system requires 4 dB more power than the channel can tolerate. How would you overcome this problem?

Reference no: EM131771900

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