Assume that data of the form Z = S + N are observed where S and N
Question:
Assume that data of the form Z = S + N are observed where S and N are independent, Gaussian random variables representing signal and noise, respectively, with zero means and variances σ2s and σ2n. Design a likelihood ratio tests for each of the following cases. Describe the decision regions in each case and explain your results.
(a) c11 = c22 = 0; c21 = c12; p0 = q0 = 1/2
(b) c11 = c22 = 0; c21 = c12; p0 = 1/4; q0 = 3/4
(c) c11 = c22 = 0; c21 = 1/2 c12; p0 = q0 = 1/2
(d) c11 = c22 = 0; c21 = 2c12; p0 = q0 = 1/2
Note that under either hypothesis, Z is a zero-mean Gaussian random variable. Consider what the variances are under hypothesis H1 and H2, respectively.
Step by Step Answer:
Principles of Communications Systems, Modulation and Noise
ISBN: 978-8126556793
7th edition
Authors: Rodger E. Ziemer, William H. Tranter