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Unformatted text preview: Lecture 13 - EE 359: Wireless Communications - Fall 2003 MIDTERM This exam is open book and notes, and calculators are needed. Graded exams and solutions will be available next week. Good Luck! Problem 1 (40 points): Wireless Channels. This problem illustrates the impact of channel delay spread on wireless system performance when T s T M , as well as the impact of Doppler. Consider a channel with impulse response c ( , t ) = ( )+ . 5 ( - 10 sec)+ . 5 ( - 40 sec) . (a) Is the channel time-varying or time-invariant? Explain. (b) For what data rates does a BPSK signal sent over this channel experience ISI? (c) Define rect t T s = ( 1 | t | < T s / 2 else . Suppose we transmit the signal s ( t ) consisting of two pulses, s ( t ) = rect t T s + rect t- T s T s through the channel with impulse response c ( , t ). Sketch the received signal for T s = 20 sec. Does the received signal exhibit ISI (why or why not)?...
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This note was uploaded on 08/05/2008 for the course EE 359 taught by Professor Goldsmith during the Spring '08 term at Stanford.
- Spring '08