ECE 5325/6325 Fall 2009: Homework 5(f) Solution
From the Lecture 11 notes: Frequency Shift Keying : Assume Ts > 1/fc , and show that these two are orthogonal. 1 (t) = 2 (t) = cos (2fc t), 0 t Ts 0, o.
ECE 5325/6325 Fall 2009: Homework 7(a-d) Solutions
7a: (i) For each subchannel, B/N bandwidth is used. (ii) For each subchannel R/N data rate is carried. Or, if QAM/PSK is used, the bit rate is log2 M
ECE 5325/6325 Spring 2010: Homework 7(e-f) Solutions
7e: We need to compute rS , where the multiplication is multiply and then sum mod 2. (i) r = [1, 1, 1, 1, 0, 0, 0] so 1 0 1 1 1 0 0 1 1 0 1 0 1 0 1
ECE 5325/6325 Fall 2009: Homework 8d Solutions
My answers for the required fade margin in dB for M independent Rayleigh fading channels is shown in the table. For selection combining, the result is fr
Sheet1 What standards, frequencies, bands do I use for wireless communications? Note these answers are mine; you might use different devices and products. Standard Bands Channel BW (MHz) Cell phone (V
ECE 5325/6325 Fall 2009: Homework 4(f) Solution
(4f) As shown in this gure, a WLAN signal arrives at a ground oor access point from a laptop (Pt=100 mW) on the 3rd oor, via scattering from a tree outs
ECE 5325/6325 Fall 2009: Exam 1 Solutions
1. (25 pts total) Question 1 was dierent between the 6325 and 5325 exams (but all other questions were the same). For the other half who havent seen the quest
ECE 5325/6325 Fall 2009: Exam 2 Solutions
1. (25 pts total) The total length of the direct path would be 2002 + 292 = 202 m. Because of the symmetry, the two distances to the knife edge are d1 = d2 =
ECE 6325/5325 Spring 2010: Exam 3 Solutions
1. (20 pts) (a) For d = [1, 0, 1], we need to nd d = cG. In this case d = [1, 0, 1, 1, 2, 1] mod 2 = [1, 0, 1, 1, 0, 1]. (b) The coded bits [1, 0, 1, 0, 0,
ECE 5325/6325 Fall 2009: Homework 3(d) Solution
(3d) Typical cell phones transmit 500mW maximum. BS receivers require -115 dBm of power. What is the maximum distance between a cell phone and base stat
ECE 5325/6325 Fall 2009: Homework 3(d) Solution
(3f) What is the approximate E-eld magnitude in the two-ray (ground reection) model from Section 4.6 for vertical polarization (i.e., when the reection
ECE 5325/6325 Fall 2009: Homework 4(a) Solution
(4a) Extend the GSM uplink example from the lecture 7 notes, and consider the GSM downlink, using the same system parameters with one dierence. The dier
ECE 5325/6325 Fall 2009: Homework 4(b) Solution
(4b) For the sensor network example from the lecture 7 notes, what would the range be if the fade margin was zero? In that case, how would the range inc