Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Textbook Question
Chapter 13, Problem 4R
How many wires must be run between an incandescent lamp and its dimmer control?
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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
W/Hz. The maximum distance is 36 meters and the losses in the channel attenuates the signal by 0.25
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:
Hokies PSK Chip Set Operating Current NOT Including
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
Voltage (volts)…
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…
Find Vb and Va using Mesh analysis
Chapter 13 Solutions
Electrical Wiring Residential
Ch. 13 - Prob. 1RCh. 13 - Prob. 2RCh. 13 - Prob. 3RCh. 13 - How many wires must be run between an incandescent...Ch. 13 - Complete the wiring diagram for the dimmer and...Ch. 13 - Is it possible to dim standard fluorescent...Ch. 13 - a. How many wires must be run between a...Ch. 13 - Explain why fluorescent lamps having the same...Ch. 13 - What is the total current consumption of the track...Ch. 13 - Prob. 10R
Ch. 13 - Prob. 11RCh. 13 - Electronic dimmers of the type sold for...Ch. 13 - Prob. 13RCh. 13 - A layout of the outlets, switches, dimmers, track...Ch. 13 - Prob. 15RCh. 13 - Prob. 16RCh. 13 - Prob. 17RCh. 13 - Prob. 18RCh. 13 - May a standard electronic dimmer be used to...Ch. 13 - Prob. 20RCh. 13 - Why should the power be turned off when hooking up...
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