Question 1

An IR remote control sends a 25-bit sequence every 0.01 s.The data rate of this remote control equals _______ bps.

Accepted Answer

$$\text { 2500. } 25 \text { bits } / 0.01 \mathrm {~s} = 2,500 \mathrm { bps }$$

Question 2

Adding a parity bit to a data byte results in a DIF $=$ $( x / y )$.

Accepted Answer

$9 / 8$

Question 3

The channel from a space probe to earth has a bandwidth $B = 10 ^ { 6 }$ Hz.The channel capacity when the probe is $10 ^ { 3 }$ km from earth is $C = 10 ^ { 7 }$ bps = 10 Mbps.Using the inverse square law to describe the signal power loss, the capacity when the probe is at $2 \times 10 ^ { 3 }$ km from earth equals _____ Mbps.Assume that the noise power is constant.

Accepted Answer

$\log _ { 2 } \left( 1 + \sigma _ { s } ^ { 2 } \left( \alpha r _ { o } \right) / \sigma _ { N } { } ^ { 2 } \right) = C / B = 10 \rightarrow \sigma _ { s } { } ^ { 2 } \left( \alpha r _ { o } \right) / \sigma _ { N } { } ^ { 2 } = 1023 . \text { At } 2 r _ { 0 } , \sigma _ { s } { } ^ { 2 } \left( \alpha r _ { o } \right) / \sigma _ { N } { } ^ { 2 } = 1023 / 4 = 255.75$ $\rightarrow \log _ { 2 } ( 255.75 + 1 ) = 8 \rightarrow C = 8 B = 8 \mathrm { Mbps }$

Question 4

Consider the binary data packet shown as a spreadsheet with columns indicated by letters and rows by numbers.The last row contains the LRC and there is one error.The letter-number address of the error is___. $$\begin{array} { | c | c | c | c | c | c | } 
\hline & \text { A } & \text { B } & \text { C } & \text { D } & \text { E } \
\hline 1 & 1 & 1 & 0 & 0 & 1 \
\hline 2 & 0 & 1 & 0 & 1 & 1 \
\hline 3 & 0 & 0 & 1 & 0 & 1 \
\hline 4 & 1 & 1 & 1 & 1 & 1 \
\hline 5 & 1 & 0 & 0 & 1 & 1 \
\hline
\end{array}$$

Accepted Answer

C-3.Most rows and columns show

Question 5

The SNR of the channel from a space probe to earth equals 2047 and the channel capacity C = 5 x $10 ^ { 7 }$ bps.The channel bandwidth = _________ (x.xx) MHz.

Accepted Answer

The answer of The SNR of the channel from a...

Question 6

The threshold intensity for a receiver $\mathrm { I } _ { \mathrm { r } } = 2.5 \times 10 ^ { - 6 } \mathrm {~W} / \mathrm { m } ^ { 2 }$ If the intensity produced by an antenna equals $10 \mathrm {~W} / \mathrm { m } ^ { 2 }$ at a range of 1 m, the maximum reliable range of the system equals ____ km.

Accepted Answer

The answer of The threshold intensity for a receiver \(\mathrm...

Question 7

An error-correction scheme appends a parity bit to each data byte to form code word and the sequence of 15 code words is followed by a longitudinal redundancy check (LRC) code word to orm a data packet.The resulting DIF = ____ .

Accepted Answer

1.2.Each code word contains 9

Question 8

The channel from a space probe to earth has a bandwidth $B = 10 ^ { 6 }$ Hz and a channel capacity C = $0.8 \times 10 ^ { 7 } \text { bps }$ .The signal-to-noise ratio $\sigma _ { s } { } ^ { 2 } / \sigma _ { N } { } ^ { 2 }$ equals ______.

Accepted Answer

The answer of The channel from a space probe to...

Question 9

Consider the binary data packet shown as a spreadsheet with columns indicated by letters and rows by numbers.The parity bits are in column E.The code words use _____ parity and the LRC
uses _____ parity. $$\begin{array} { | c | c | c | c | c | c | } 
\hline & \text { A } & \text { B } & \text { C } & \text { D } & \text { E } \
\hline 1 & 0 & 1 & 0 & 0 & 1 \
\hline 2 & 0 & 1 & 1 & 1 & 1 \
\hline 3 & 0 & 0 & 1 & 0 & 1 \
\hline 4 & 1 & 1 & 1 & 1 & 0 \
\hline 5 & 0 & 0 & 0 & 1 & 1 \
\hline
\end{array}$$

Accepted Answer

Even, odd.Each row contains an

Question 10

A movie source generates a set of 1080p HD digital image files, each file composed of 1920 x 1080 picture elements (pixels), with each pixel specified with three bytes of information.When the source produces 30 images per second, its raw (uncoded) data rate equals _____ $\left( x . x x 10 ^ { \gamma } \right)$ bps.

Accepted Answer

The answer of A movie source generates a set of...

Question 11

The data rate produced by a typist is 56 bits/second.Assuming that the text is encoded using the
standard 8-bit ASCII code, the number of letters that is typed in one second equals ____
letters/second.

Accepted Answer

The answer of The data rate produced by a typist...

An IR remote control sends a 25-bit sequence every 0.01 s.The data rate of this remote control equals _______ bps.

Adding a parity bit to a data byte results in a DIF $=$ $( x / y )$ .

Consider the binary data packet shown as a spreadsheet with columns indicated by letters and rows by numbers.The last row contains the LRC and there is one error.The letter-number address of the error is___. A B C D E 1 1 1 0 0 1 2 0 1 0 1 1 3 0 0 1 0 1 4 1 1 1 1 1 5 1 0 0 1 1

The SNR of the channel from a space probe to earth equals 2047 and the channel capacity C = 5 x $10 ^ { 7 }$ bps.The channel bandwidth = _________ (x.xx) MHz.

An error-correction scheme appends a parity bit to each data byte to form code word and the sequence of 15 code words is followed by a longitudinal redundancy check (LRC) code word to orm a data packet.The resulting DIF = ____ .

The channel from a space probe to earth has a bandwidth $B = 10 ^ { 6 }$ Hz and a channel capacity C = $0.8 \times 10 ^ { 7 } \text { bps }$ .The signal-to-noise ratio $\sigma _ { s } { } ^ { 2 } / \sigma _ { N } { } ^ { 2 }$ equals ______.

Consider the binary data packet shown as a spreadsheet with columns indicated by letters and rows by numbers.The parity bits are in column E.The code words use _ parity and the LRC uses _ parity. A B C D E 1 0 1 0 0 1 2 0 1 1 1 1 3 0 0 1 0 1 4 1 1 1 1 0 5 0 0 0 1 1

The data rate produced by a typist is 56 bits/second.Assuming that the text is encoded using the standard 8-bit ASCII code, the number of letters that is typed in one second equals ____ letters/second.

Introduction

Sensors and Actuators

Combinational Logic Circuits

Sequential Logic Circuits

Converting Between Analog and Digital Signals

Modeling Random Data and Noise

Detecting Data Signals in Noise

Designing Signals for Multiple-Access Systems

Source Coding

Data Networks

Symbology

Excel Best Practices

Filters

Exam 10: Channel Coding

An IR remote control sends a 25-bit sequence every 0.01 s.The data rate of this remote control equals _______ bps.

Adding a parity bit to a data byte results in a DIF === (x/y)( x / y )(x/y) .

Consider the binary data packet shown as a spreadsheet with columns indicated by letters and rows by numbers.The last row contains the LRC and there is one error.The letter-number address of the error is___. A B C D E 1 1 1 0 0 1 2 0 1 0 1 1 3 0 0 1 0 1 4 1 1 1 1 1 5 1 0 0 1 1

The SNR of the channel from a space probe to earth equals 2047 and the channel capacity C = 5 x 10710 ^ { 7 }107 bps.The channel bandwidth = _________ (x.xx) MHz.

An error-correction scheme appends a parity bit to each data byte to form code word and the sequence of 15 code words is followed by a longitudinal redundancy check (LRC) code word to orm a data packet.The resulting DIF = ____ .

The channel from a space probe to earth has a bandwidth B=106B = 10 ^ { 6 }B=106 Hz and a channel capacity C = 0.8×107 bps 0.8 \times 10 ^ { 7 } \text { bps }0.8×107 bps .The signal-to-noise ratio σs2/σN2\sigma _ { s } { } ^ { 2 } / \sigma _ { N } { } ^ { 2 }σs​2/σN​2 equals ______.

Consider the binary data packet shown as a spreadsheet with columns indicated by letters and rows by numbers.The parity bits are in column E.The code words use _____ parity and the LRC uses _____ parity. A B C D E 1 0 1 0 0 1 2 0 1 1 1 1 3 0 0 1 0 1 4 1 1 1 1 0 5 0 0 0 1 1

The data rate produced by a typist is 56 bits/second.Assuming that the text is encoded using the standard 8-bit ASCII code, the number of letters that is typed in one second equals ____ letters/second.

Introduction

Sensors and Actuators

Combinational Logic Circuits

Sequential Logic Circuits

Converting Between Analog and Digital Signals

Modeling Random Data and Noise

Detecting Data Signals in Noise

Designing Signals for Multiple-Access Systems

Source Coding

Data Networks

Symbology

Excel Best Practices

Filters

Adding a parity bit to a data byte results in a DIF $=$ $( x / y )$ .

The SNR of the channel from a space probe to earth equals 2047 and the channel capacity C = 5 x $10 ^ { 7 }$ bps.The channel bandwidth = _________ (x.xx) MHz.

The channel from a space probe to earth has a bandwidth $B = 10 ^ { 6 }$ Hz and a channel capacity C = $0.8 \times 10 ^ { 7 } \text { bps }$ .The signal-to-noise ratio $\sigma _ { s } { } ^ { 2 } / \sigma _ { N } { } ^ { 2 }$ equals ______.

Consider the binary data packet shown as a spreadsheet with columns indicated by letters and rows by numbers.The parity bits are in column E.The code words use _ parity and the LRC uses _ parity. A B C D E 1 0 1 0 0 1 2 0 1 1 1 1 3 0 0 1 0 1 4 1 1 1 1 0 5 0 0 0 1 1