Business Driven Information Systems
6th Edition
ISBN: 9781260004717
Author: Paige Baltzan
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 6, Problem 7RQ
To determine
To discuss:
How does ETL help transfer data in and out of the data warehouse?
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4. A battery operated sensor transmits to a receiver that is plugged in to a power outlet. The device is
continuously operated. The battery is a 3.6 V coin-cell battery with a 245mAHr capacity.
The application requires a bit rate of 36 Mbps and an error rate of less than 10^-3. The channel has a
center frequency of 2.4 GHz, a bandwidth of 10 MHz and a noise power spectral density of 10^-14
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dB/meter.
Your company has two families of chips that you can use. An M-ary ASK and an M-ary QAM chip. The
have very different power requirements as shown in the table below.
The total current for the system is the current required to achieve the desired Eb/No PLUS the current
identified below:
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the required Eb/No for the application
Hokies QAM Chip Set Operating Current NOT Including
the required Eb/No for the application
Chip ID
M-ary
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8. A prestressed concrete beam is subjected to the
following stress distributions:
Pi is the initial prestressing force, Pe is the effective
prestressing force, M, is the bending moment due to self-
weight, Ma and M, are the dead load and live load bending
moment, respectively.
The concrete has the following properties: fr = 6000 psi
and fri = 4200 psi
+250 -85 -2500
+550
Pe+ Mo+Ma+Mi
P alone
P₁+ Mo
-2450 -3500
Stress at midspan
+210
+250
P, alone
Pe alone
-2500 -3500
Stress at ends
Using Table 22.1, evaluate whether the stresses at the center of the span and the end of the span comply with the
permissible stress limits. The beam is classified as U-class.
Provide justifications for each condition listed in the table.
Note: Calculated stresses are to be taken from the above diagram, and permissible stresses are to be calculated
using Table 22.1.
Compressive stresses
immediately after transfer
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Using the 802.11a specifications given below, in Matlab (or similar tool) create the time domain signal
for one OFDM symbol using QPSK modulation. See attached plot for the QPSK constellation.
Your results should include the power measure in the time and frequency domain and comment on
those results.
BW
802.11a OFDM PHY Parameters
20 MHZ
OBW
Subcarrer Spacing
Information Rate
Modulation
Coding Rate
Total Subcarriers
Data Subcarriers
Pilot Subcarriers
DC Subcarrier
16.6 MHZ
312.5 Khz (20MHz/64 Pt FFT)
6/9/12/18/24/36/48/54 Mbits/s
BPSK, QPSK, 16QAM, 64QAM
1/2, 2/3, 3/4
52 (Freq Index -26 to +26)
48
4 (-21, -7, +7, +21)
*Always BPSK
Null (0 subcarrier)
52 subarriers
-7
(48 Data, 4 Pilot (BPSK), 1 Null)
-26 -21
0
7
21 +26
14
One Subcarrier
1 OFDM symbol
1 OFDM Burst
-OBW 16.6 MHz
BW 20 MHZ
1 constellation point
= 52 subcarriers
= one or more OFDM symbols
802.11a OFDM Physical Parameters
Show signal at this point
x bits
do
Serial
Data
d₁
S₁
Serial-to-
Input
Signal
Parallel
Converter
IFFT…
Chapter 6 Solutions
Business Driven Information Systems
Ch. 6 - Prob. 1OCQCh. 6 - Prob. 2OCQCh. 6 - Prob. 3OCQCh. 6 - Prob. 4OCQCh. 6 - Prob. 5OCQCh. 6 - Prob. 6OCQCh. 6 - Prob. 1RQCh. 6 - Prob. 2RQCh. 6 - Prob. 3RQCh. 6 - Prob. 4RQ
Ch. 6 - Prob. 5RQCh. 6 - Prob. 6RQCh. 6 - Prob. 7RQCh. 6 - Prob. 8RQCh. 6 - Prob. 9RQCh. 6 - Prob. 10RQCh. 6 - Prob. 11RQCh. 6 - Prob. 12RQCh. 6 - Prob. 13RQCh. 6 - Prob. 14RQCh. 6 - Prob. 15RQCh. 6 - Prob. 1CCOCh. 6 - Prob. 2CCOCh. 6 - Prob. 3CCOCh. 6 - Prob. 4CCOCh. 6 - Prob. 5CCOCh. 6 - Prob. 6CCOCh. 6 - Prob. 7CCOCh. 6 - Prob. 1CCTCh. 6 - Prob. 2CCTCh. 6 - Prob. 3CCTCh. 6 - Prob. 4CCTCh. 6 - Prob. 5CCTCh. 6 - Prob. 6CCTCh. 6 - Prob. 1CBTCh. 6 - Prob. 2CBTCh. 6 - Prob. 3CBTCh. 6 - Prob. 4CBTCh. 6 - Prob. 5CBTCh. 6 - Prob. 6CBTCh. 6 - Prob. 7CBTCh. 6 - Prob. 8CBTCh. 6 - Prob. 9CBTCh. 6 - Prob. 10CBTCh. 6 - Prob. 11CBTCh. 6 - Prob. 12CBTCh. 6 - Prob. 13CBTCh. 6 - Prob. 14CBTCh. 6 - Prob. PIAYKBPCh. 6 - Prob. PIIAYKBPCh. 6 - Prob. PIIIAYKBPCh. 6 - Prob. PIVAYKBPCh. 6 - Prob. PVAYKBPCh. 6 - Prob. PVIAYKBPCh. 6 - Prob. PVIIAYKBP
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