HW6 - ECEN 661 - Modulation Theory Homework #6 Assignment...

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ECEN 661 - Modulation Theory Homework #6 Assignment Date: 3/17/08 Due Date: 3/25/08 1. (Text 5.12, 4th edition, modified). In Section 4.3.1 in the text it was shown that the minimum frequency separation for orthogonality of binary FSK signals with coherent detection is . However, a lower error probability is possible with coherent detection of FSK if is increased beyond . (a) Show that the optimum value of is . (b) Determine the probability of error for this value of . (c) State the gain in dB achieved by using the optimum frequency spacing instead of that which leads to orthogonal signalling. 2. (Text 5.20, 4th edition, modified) Consider two 8-point QAM signal constellations shown in the figure. The minimum distance between adjacent points is 2A. (a) Determine the average transmitted power for each constellation, assuming that the signal points are equally probable. (b) Which constellation is more power efficient? Also state the difference (in dB) in asymptotic relative power efficiency of the two signalling schemes.
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This note was uploaded on 02/21/2012 for the course ECEN 611 taught by Professor Miller during the Spring '08 term at Texas A&M.

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HW6 - ECEN 661 - Modulation Theory Homework #6 Assignment...

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