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A 16-ary signal constellation consists of four signals with coordinates (plusminus - 1, plusminus - 1), four others with coordinates (plusminus 3, plusminus 3), and two each having coordinates (plusminus 3, 0), (plusminus 5, 0), (0, plusminus 3), and (0, plusminus 5), respectively. (a) Sketch the signal constellation and indicate the ML decision regions. (c) Find the nearest neighbors approximation to the average symbol error probability as a function of E_b/N_0. (d) Find the nearest neighbors approximation to the average symbol error probability for 16-QAM as a function of E_b/N_0. (e) Comparing (c) and (d) (i.e., comparing the performance at high SNR), which signal set is more power efficient? A 16-ary signal constellation consists of four signals with coordinates (plusminus - 1, plusminus - 1), four others with coordinates (plusminus 3, plusminus 3), and two each having coordinates (plusminus 3, 0), (plusminus 5, 0), (0, plusminus 3), and (0, plusminus 5), respectively. (a) Sketch the signal constellation and indicate the ML decision regions. (c) Find the nearest neighbors approximation to the average symbol error probability as a function of E_b/N_0. (d) Find the nearest neighbors approximation to the average symbol error probability for 16-QAM as a function of E_b/N_0. (e) Comparing (c) and (d) (i.e., comparing the performance at high SNR), which signal set is more power efficient