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Unformatted text preview:  y 2 [ i ](  h 1 [ i ]  2 +  h 2 [ i ]  2 ) x [ i ] ) 2 2. Using the same procedure as in problem 3(b) from Homework 3, show that the probability of bit error for QPSK with M receive antennas and MRC is given by: 1 2 P [ X ≤ 1 M SNR ] where X is Fdistributed(2 M, 1). 3. Show that the output SNR for equal gain combining (signals are phased, but are then equally weighted) is ² ³ M i =1  h i  ´ 2 M SNR and that the expected output SNR is (1 + ( M1)( π/ 4)) SNR . 1 4. Write a Matlab script that produces a plot of probability of bit error (for QPSK) vs. SNR for 3 receive antennas, and three diﬀerent combining methods: MRC, equal gain combining, and selection combining. You should generate the plot using Monte Carlo simulation. The SNR in this plot should be the singleantenna average signaltonoise ratio, and should range from5 to 15 dB. 2...
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This note was uploaded on 11/21/2011 for the course EE 5505 taught by Professor Jindal,n during the Spring '08 term at Minnesota.
 Spring '08
 Jindal,N

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