# (solution) Exercise 9.14 In this exercise we will explore the implications of the condition for approximate

Exercise 9.14 In this exercise we will explore the implications of the condition for approximate universality in (9.53). Show that if a parallel channel scheme satisfies the condition (9.53), then it achieves the diversity–multiplexing tradeoff of the parallel channel. Hint : Do Exercise 9.9 first. Show that the diversity–multiplexing tradeoff can still be achieved even when the scheme satisfies a more relaxed condition: l d 1 d 2 ··· d L l 2 /L 1 &gt;c · L 2 R , for some constant c&gt; 0 . (9.97)