ELECTRIC CIRCUITS-W/MASTERINGENGINEERING
11th Edition
ISBN: 9780134894300
Author: NILSSON
Publisher: PEARSON
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Chapter 2, Problem 9P
To determine
Calculate the total power developed in the given circuit.
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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 2 Solutions
ELECTRIC CIRCUITS-W/MASTERINGENGINEERING
Ch. 2.1 - Prob. 1APCh. 2.1 - For the circuit shown,
What value of α is required...Ch. 2.2 - For the circuit shown,
If υg = 1 kV and ig = 5 mA,...Ch. 2.2 - For the circuit shown,
If ig = 0.5 A and G = 50...Ch. 2.4 - Prob. 5APCh. 2.4 - Use Ohm’s law and Kirchhoff’s laws to find the...Ch. 2.4 - a)
The terminal voltage and terminal current were...Ch. 2.4 - Repeat Assessment Problem 2.7, but use the...Ch. 2.5 - Prob. 9APCh. 2.5 - The current iϕ in the circuit shown is 2 A....
Ch. 2 - Prob. 1PCh. 2 - Prob. 2PCh. 2 - If the interconnection in Fig. P2.3 is valid, find...Ch. 2 - If the interconnection in Fig. P2.4 is valid, find...Ch. 2 - The interconnection of ideal sources can lead to...Ch. 2 - Consider the interconnection shown in Fig....Ch. 2 - Consider the interconnection shown in Fig....Ch. 2 - If the interconnection in Fig. P2.8 is valid, find...Ch. 2 - Find the total power developed in the circuit in...Ch. 2 - Is the interconnection in Fig. P2.10 valid?...Ch. 2 - For the circuit shown in Fig. P2.11
Figure...Ch. 2 - For the circuit shown in Fig. P2.12
Figure...Ch. 2 - A pair of automotive headlamps is connected to a...Ch. 2 - The terminal voltage and terminal current were...Ch. 2 - A variety of current source values were applied to...Ch. 2 - A variety of voltage source values were applied to...Ch. 2 - Find the currents i1 and i2 in the circuit in Fig....Ch. 2 - Given the circuit shown in Fig. P2.18, find
Figure...Ch. 2 - The current ia in the circuit shown in Fig. P2.19...Ch. 2 - Prob. 20PCh. 2 - The current ix in the circuit shown in Fig. P2.21...Ch. 2 - The current io in the circuit in Fig. P2.22 is 2...Ch. 2 - The voltage across the 22.5 Ω resistor in the...Ch. 2 - The currents i1 and i2 in the circuit in Fig....Ch. 2 - The currents ia and ib in the circuit in Fig....Ch. 2 - Prob. 26PCh. 2 - The variable resistor R in the circuit in Fig....Ch. 2 - The voltage and current were measured at the...Ch. 2 - The voltage and current were measured at the...Ch. 2 - Prob. 30PCh. 2 - Prob. 31PCh. 2 - Consider the circuit shown in Fig. P2.32.
Find...Ch. 2 - For the circuit shown in Fig. P2.33, find υo and...Ch. 2 - For the circuit shown in Fig. P2.34, find υo and...Ch. 2 - Find (a) io, (b) i1, and (c) i2 in the circuit in...Ch. 2 - For the circuit shown in Fig. P2.36, calculate (a)...Ch. 2 - Find υ1 and υg in the circuit shown in Fig. P2.37...Ch. 2 - Derive Eq. 2.21. Hint: Use Eqs. (3) and (4) from...Ch. 2 - For the circuit shown in Fig. 2.24, R1 = 40 kΩ R2...Ch. 2 - Suppose you want to add a third radiator to your...Ch. 2 - Repeat Problem 2.41 using the wiring diagram shown...Ch. 2 - Repeat Problem 2.41 using the wiring diagram shown...Ch. 2 - Repeat Problem 2.41 using the wiring diagram shown...
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