Consider the octal signal point constellation shown in Figure 5.34.
(a) The nearest neighbor signal points in the 8-QAM signal constellation are separated by a distance of A. Determine the radii a and b of the inner and outer circles.
(b) The adjacent signal points in the 8-PSK are separated by a distance of A. Determine the radius r of the circle.
(c) Determine the average transmitter powers for the two signal constellations and compare the two powers. What is the relative power advantage of one constellation over the other? (Assume that all signal points are equally probable.)
(d) Is it possible to assign three data bits to each point of the signal constellation such that nearest neighbor (adjacent) points differ in only one bit position?
(e) Determine the symbol rate if the desired bit rate is 90 Mbps.
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