0.8 0.6 0.4 0.2 ° -0.2 -0.4 -0.6 QPSK Constellation Plot 1 Volt 45° -0.8 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 . 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 OFDM Sysmbol Plot with BPSK and Null Carriers + • -0.8 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 Example of time domain signal 20log(x(t)) Time Domain of 802.11a OFDM Symbol 20 Power time domain = 9.229867e-01' Power freq domain = 9.230769e-01 10 0 -10 -20 -30 -40 -50 -60 -70 0 50 100 150 Time usec 200 250 300 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 Mapper Parallel- to-Serial Converter Guard Interval Insertion DA& Low pass Filter s(t Up- Converter d Guard Intervals Symbols, Fast Foncier Transfom Time Subchannels Frequency Channel x bits Serial Data Parallel- Output to-Serial Converter Signal One-tap Demapper Equalizer FFT Serial-to- Parallel Converter Guard Interval Removal AD Down- Converter
0.8 0.6 0.4 0.2 ° -0.2 -0.4 -0.6 QPSK Constellation Plot 1 Volt 45° -0.8 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 . 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 OFDM Sysmbol Plot with BPSK and Null Carriers + • -0.8 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 Example of time domain signal 20log(x(t)) Time Domain of 802.11a OFDM Symbol 20 Power time domain = 9.229867e-01' Power freq domain = 9.230769e-01 10 0 -10 -20 -30 -40 -50 -60 -70 0 50 100 150 Time usec 200 250 300 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 Mapper Parallel- to-Serial Converter Guard Interval Insertion DA& Low pass Filter s(t Up- Converter d Guard Intervals Symbols, Fast Foncier Transfom Time Subchannels Frequency Channel x bits Serial Data Parallel- Output to-Serial Converter Signal One-tap Demapper Equalizer FFT Serial-to- Parallel Converter Guard Interval Removal AD Down- Converter
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
ChapterS: Safety, Basic Electricity And Ohm's Law
Section: Chapter Questions
Problem 8RQ: What is an MSDS?
Related questions
Question
Transcribed Image Text:0.8
0.6
0.4
0.2
°
-0.2
-0.4
-0.6
QPSK Constellation Plot
1 Volt
45°
-0.8
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
.
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
OFDM Sysmbol Plot with BPSK and Null Carriers
+
•
-0.8
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
Example of time domain signal
20log(x(t))
Time Domain of 802.11a OFDM Symbol
20
Power time domain = 9.229867e-01'
Power freq domain = 9.230769e-01
10
0
-10
-20
-30
-40
-50
-60
-70
0
50
100
150
Time usec
200
250
300
Transcribed Image Text: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
Mapper
Parallel-
to-Serial
Converter
Guard
Interval
Insertion
DA&
Low pass
Filter
s(t
Up-
Converter
d
Guard
Intervals
Symbols,
Fast Foncier
Transfom
Time
Subchannels
Frequency
Channel
x bits
Serial
Data Parallel-
Output to-Serial
Converter
Signal
One-tap
Demapper Equalizer
FFT
Serial-to-
Parallel
Converter
Guard
Interval
Removal
AD
Down-
Converter
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