Determine an optimal binary prefix code


Assignment:

A discrete time rp x(nTs) with iid symbols and Laplacian distribution

Px(a) = 1/2V0e-|a|/V0

is quantized with an uniform quantizer with L levels and step size  Δ. Let xq(nTs) be the quantizer output rp.

a) Find alphabet, entropy and information rate of xq(nTs) in the case 1/Ts = 8kHz, L = 6 and = V0/2.

b) Find an optimal binary prefix code for xq(nTs), with the above values for L and and evaluate its efficiency.

c) Show that when L is even and Δ = V0 ln 2, there exists a prefix code with unit efficiency for xq(nTs).

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