Question

Consider a system with QPSK modulation with the constellation diagram shown in slide 14 of the equalization chapter. The symbols are transmitted over a time-varying frequency-selective fading channel with channel length L = 2. The equivalent discrete-time channel impulse response is: h0(k) = [0.1+0.2j, 0.5−0.3j]; h1(k) = [−0.3+0.9j, 1.1+0.5j]. If the received symbols at the receiver are: y = [0.2+ 1.1j, −2.1−0.8j]. Find out what are the two symbols sent by the transmitter by using Viterbi algorithm.

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Answer 1