practice_midterm_2010

practice_midterm_2010 - EE 5505 Wireless Communication...

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EE 5505 Prof. Jindal Wireless Communication March 9, 2010 Practice Problems for Midterm Exam 1. Cell Radius Consider a system that follows the simplified path loss model with K = 10 dB, d 0 = 1 m, γ = 3, and P t = 0 dB. Assume the noise power in the bandwidth of interest is - 87 dB. (a) If BPSK is used, what is the maximum cell radius such that all locations achieve a bit error rate no larger than 10 - 3 ? (b) How does your answer change if QPSK is instead used? 2. Small-Scale Fading In this problem we study the effect of multipath, or small-scale fading. Consider the propagation environment shown in Figure 1, in which the received signal is the sum of two reflected paths. There is no line of sight path due to the obstruction that is di- rectly in front of the TX. The TX and RX are each located exactly midway between the two reflecting walls. For the sake of simplicity, assume the reflection coefficient of the wall is one, i.e., the phase is not changed when the signal bounces off the wall. Furthermore, assume the system is narrowband.
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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.

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practice_midterm_2010 - EE 5505 Wireless Communication...

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