baseband transmissions (1) transmission medium sender receiver transmission digital signals 010 0 1...
TRANSCRIPT
![Page 1: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/1.jpg)
Baseband Transmissions (1)
Transmission Medium
Sender ReceiverTransmission
Digital Signals 0 1 0 01
Signals all same shape
CS 590/490 Wireless Networks
Wireless_01/001
• A type of signal transmissions in which signals are directly inserted onto a signal transmission medium
Data
![Page 2: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/2.jpg)
Transmission Medium
Signals all same shape
Analog Signals
CS 590/490 Wireless Networks
Fundamentals/002
Baseband Transmissions (1)
• A type of signal transmissions in which signals are directly inserted onto a signal transmission medium
Sender ReceiverTransmission
![Page 3: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/3.jpg)
Baseband Transmissions (2)
• A type of signal transmissions in which signals are directly inserted onto a signal transmission medium
(the shape of the signals are same at the sender, in the transmission medium and even at the receiver)
• A type of signal transmissions that can transmit a signal from single sender at a time
(Transmission Medium)
CS 590/490 Wireless Networks
Fundamentals/003
Host A
Host B
Host C
![Page 4: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/4.jpg)
Baseband Transmissions (2)
• A type of signal transmissions in which signals are directly inserted onto a signal transmission medium
(the shape of the signals are same at the sender, in the transmission medium and even at the receiver)
• A type of signal transmissions that can transmit a signal from single sender at a time
0 1 10 0 0 0 0 0
0 10 0 0 10 0 0
(Signals merged)
0 1 0 1 0 1 0 1
The receiver receives “01010101”,but can’t tell who sent which signals
CS 590/490 Wireless Networks
Fundamentals/004
(Transmission Medium)
Host A
Host B
Host C
![Page 5: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/5.jpg)
• A type of signal transmissions in which signals are directly inserted onto a signal transmission medium
(the shape of the signals are same at the sender, in the transmission medium and even at the receiver)
• A type of signal transmissions that can transmit a signal from single sender at a time
(Transmission Medium)
The receiver will receive merged analogsignals, which will sound like gibberish
+
CS 590/490 Wireless Networks
Fundamentals/005
Baseband Transmissions (2)
Host A
Host B
Host C
(Signals merged)
![Page 6: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/6.jpg)
Two major problems in baseband transmissions
Only one signal transmitter at a time
Can’t achieve (high-speed) (long distance) transmission
CS 590/490 Wireless Networks
Fundamentals/006
Baseband Transmissions (3)
![Page 7: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/7.jpg)
Two major problems in baseband transmissions
Only one signal transmitter at a time
Wired networks = “transmission medium” is “cable”
CS 590/490 Wireless Networks
Fundamentals/007
Baseband Transmissions (3)
A
B
C
D
E
F
G
Cable A-F
Cable E-FCable A-D
Cable B-C
Cable B-G
• What if we need to support multiple simultaneous communication using the baseband transmission?
Install more cables!
(not efficient, but it would work)
![Page 8: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/8.jpg)
Two major problems in baseband transmissions
Only one signal transmitter at a time
CS 590/490 Wireless Networks
Fundamentals/008
Baseband Transmissions (3)
• If we have to use the baseband transmission, only one user can use the cell phone at a time
We can’t install anothertransmission medium for thiscell.
Your cell phone company may haveTo build a tower for each active customer
Wireless networks = “transmission medium” is “open air”
![Page 9: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/9.jpg)
Two major problems in baseband transmissions
Can’t achieve (high-speed) (long distance) transmission
Transmission Medium
Input(Sender)
Output(Receiver)Transmission
Digital Signals
Cable Length
?
Shorter Cable Length
CS 590/490 Wireless Networks
Fundamentals/009
Baseband Transmissions (3)
skew & distortion
We sacrificelong-distance
signal transmissions
![Page 10: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/10.jpg)
Can’t achieve (high-speed) (long distance) transmission
Transmission Medium
?
2
1
0 01 1 0
Baseband Transmissions (3)
CS 590/490 Wireless Networks
Fundamentals/010
Two major problems in baseband transmissions
The minimum signal pattern possible
Time for one signal cycle= signal cycle time
# of signal cycles in one second
Signal frequency(in Hz)
skew & distortion
We sacrificeSignal frequency
(transmission speed)
Signal cycle
![Page 11: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/11.jpg)
Baseband Transmissions (4)
Summary of baseband transmissions:
CS 590/490 Wireless Networks
Fundamentals/011
• A type of signal transmissions in which signals are directly inserted onto the transmission medium
• A type of signal transmissions that can transmit a signal from single sender at a time
• Two major problems in baseband transmissions
Since only one sender at a time, it is not an efficient for wireless signal transmissions
Can’t achieve (high-speed) (long distance) transmission
Wired signal transmissions
Either: (a) high-speed short distance transmissions
(b) low-speed long distance transmissions
• Baseband signals are susceptible to signal skews and distortions during during transmission (i.e. during propagation in the transmission medium
Cost-effective and high-speedsince no additional hardware
and processing is required
![Page 12: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/12.jpg)
Baseband Transmissions (4)
CS 590/490 Wireless Networks
Since only one sender at a time, it is not an efficient for wireless signal transmissions
Can’t achieve (high-speed) (long distance) transmission
Wired signal transmissions
Either: (a) high-speed short distance transmissions
(b) low-speed long distance transmissions
PC Motherboard
MemoryModules
MemoryBus
Processor
Graphicsubsystem
InternalBus
0 0 01 1 1
0 0 01 1 1
0 0 01 1 1
0 0 01 1 1
High-speedShort-distance
Basebandtransmissions
Fundamentals/012
![Page 13: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/13.jpg)
Baseband Transmissions (4)
CS 590/490 Wireless Networks
Since only one sender at a time, it is not an efficient for wireless signal transmissions
Can’t achieve (high-speed) (long distance) transmission
Wired signal transmissions
Either: (a) high-speed short distance transmissions
(b) low-speed long distance transmissions
PC Motherboard
MemoryModules
MemoryBus
Processor
Graphicsubsystem
InternalBus
keyboard Mouse
Printer
0 0 01 1 1
0 0 01 1 1
0 0 01 1 1
Slower I/O devices
Low-speedLong-distance
Basebandtransmissions
High-speedShort-distance
Basebandtransmissions
Fundamentals/013
![Page 14: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/14.jpg)
• A type of signal transmissions in which signals are first modulated onto “carrier signals” and then modulated signals are inserted onto a signal transmission medium
Digital Signals
Modulator
ModulatedSignals
ModulatedSignals
DeModulator
Transmission Medium
Carrier Signal Carrier Signal
CS 590/490 Wireless Networks
Fundamentals/014
Broadband Transmissions (1)
Data
0 1 0 01
![Page 15: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/15.jpg)
Carrier signal = sin curve analog signal defined by three parameters
Time0
+v
-v
Am
plit
ude
(vol
t or
pow
er)
t
A (Amplitude)
F (Frequency) = 1 second / t
CS 590/490 Wireless Networks
Fundamentals/015
Broadband Transmissions (2)
![Page 16: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/16.jpg)
Carrier signal = sin curve analog signal defined by three parameters
Time0
+v
-v
Am
plit
ude
(vol
t or
pow
er)
t
t/4 2t/4 3t/4
CS 590/490 Wireless Networks
Fundamentals/016
Broadband Transmissions (2)
900 180 270
P (Phase) in degree (0 P 360 )
![Page 17: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/17.jpg)
Why “carrier signal”?
Sin carrier signals are known to have no skew or distortion on the signal-shape (even for long distance transmission)
Each sin carrier signal has a specific frequency and two carriers with different frequency can be separated at a receiver
Broadband Transmissions (3)
CS 590/490 Wireless Networks
Fundamentals/017
![Page 18: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/18.jpg)
Why “carrier signal”?
Sin carrier signals are known to have no skew even for long distance transmission
Input(Sender)
Output(Receiver)Transmission
Carrier signals with a specific frequency
Distance =
= not affected= not affected= decrease
• P• F• A
The only limiting factor for transmissiondistance = Transmission Power (W)
If there is no“noise”
Broadband Transmissions (3)
CS 590/490 Wireless Networks
Fundamentals/018
![Page 19: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/19.jpg)
Why “carrier signal”?
Each sin carrier signal has a specific frequency and two carriers with different frequency can be separated at a receiver
Transmission Medium
Senders
FDMMultiplexer
FDMDe-Multiplexer
Receivers
Broadband Transmissions (3)
CS 590/490 Wireless Networks
Fundamentals/019
No “phase”, not “amplitudebut “frequency”
1
21 2
![Page 20: Baseband Transmissions (1) Transmission Medium Sender Receiver Transmission Digital Signals 010 0 1 Signals all same shape CS 590/490 Wireless Networks](https://reader036.vdocument.in/reader036/viewer/2022062304/56649ebc5503460f94bc568b/html5/thumbnails/20.jpg)
modulatedcarrier
Why “carrier signal”?
• Sin analog carrier signal itself does not have any meaning
SendersReceivers
• We override our payload signals on top of the carrier signal
Called “modulation”
FDMMultiplexer
FDMDe-Multiplexer
Tx Medium
carrier
carrier
carrier
carrier
modulatedcarrier
payloadsignals
payloadsignals
payloadsignals
payloadsignals
ModulatorDeModulator
Broadband Transmissions (4)
CS 590/490 Wireless Networks
Fundamentals/020