Decibel and Effective Noises Temperature Essay

BLM256 DATA MARKETING AND SALES COMMUNICATIONS

TUTORIAL PERTAINING TO CHAPTER three or more

PROBLEM you:

Given determine shows the result of getting rid of higher-harmonic pieces of a square wave and retaining just one or two lower harmonic components. What would the signal seem like in the reverse case; that is certainly, retaining most higher harmonics and removing a few reduce harmonics?

SOLUTION:

The sign would be low-amplitude, rapidly changing waveform like following sign.

PROBLEM a couple of:

Given a great amplifier with an effective noises temperature of 10, 000oK and a 10-MHz bandwidth, what energy noise level may we expect at its result? SOLUTION:

D = twelve log k + 10 log T + 15 log N

= -228. 6 dBW + twelve log 104 + 12 log 107

= -228. 6 & 40 +70 = -- 118. 6th dBW

DIFFICULTY 3:

Precisely what is the thermal noise level of your channel using a bandwidth of 10 kHz carrying multitude of watts of power working at 50oC?

SOLUTION:

N=1. 38x10-23x(50+273)x10, 1000 = some. 5x10-17 watts

PROBLEM 4:

Given a channel with an planned capacity of 20 Mbps, the bandwidth of the funnel is three or more MHz. If, perhaps white cold weather noise, what signal to noise ratio is required to accomplish this capacity?

ANSWER:

C=B log2 (1+SNR)

20x106=3x106x log2 (1+SNR)

log2 (1+SNR)=6. 67

1+SNR=102

SNS=101

PROBLEM 5:

If an amplifier provides a 30 die bahn voltage gain, what ac electricity ratio will the gain symbolize? SOLUTION:

To get a voltage rate, we have

NdB=30=20log (V2/V1)

V2/V1=1030/20=101. 5=31. six

PROBLEM 6:

If the sturdy curve in following physique represents sin( 2ПЂ ), what does the filled curve signify? That is, the dotted contour can be created in the contact form A sin( 2ПЂft + П† ); what are A, f, and П†?

OPTION:

2 sin( 4ПЂt + ПЂ ); A = 2, farreneheit = two, П† = ПЂ

DIFFICULTY 7:

Assume that the TV picture is to be transmitted over a cannel with some. 5-MHz bandwidth and a 35-dB signal-to-noise ratio. Discover the capacity with the channel (bps). SOLUTION:

PROBLEM 8:

Presume a transmission device produced 40 W of power.

a) Express the transmit electricity in models of dBm and dBW.

b) In case the transmitter's electrical power is placed on a unity gain antenna with a 900-MHz carrier rate of recurrence, which is the received electric power in dBm at a no cost space range of 90 m?

ANSWER:

PROBLEM 9 (Chapter three or more Problem a few. 7):

REMEDY:

PROBLEM 10 (Chapter 3 Problem three or more. 8):

ANSWER:

PROBLEM 10:

The sq . wave of Figure three or more. 7 c, with T=1 ms, is passed through a lowpass filtering that goes by frequencies about 8 kHz with no damping.

a) Discover the power inside the output waveform.

b) Imagine at the filter input there is also a thermal noise voltage with N0=0. you Вµ Watts /Hz, locate the output transmission to sound ratio in dB.

OPTION:

PROBLEM doze:

If the received signal level for a particular digital system is -151 dBW and the receiver program effective sound temperature can be 1500 K, what is Eb/N0 for a website link transmitting 2400 bps? SOLUTION:

PROBLEM 13:

What is the channel convenience of a teleprinter channel which has a 300 Hz bandwidth and a signalto-noise ratio of 3 dB, where noise is white thermal noise? ANSWER:

PROBLEM 18:

Adigital signaling system is instructed to operate in 9600 bps. a) If a signal component encodes a 4 tad word, what is the minimal required bandwidth of the channel?

b) Duplicate part (a) for the truth of 8-bit words.

ANSWER:

PROBLEM 15:

What is the thermal sound level of a funnel with a band width of 15 kHz transporting 1000 w of power operating in 500C?

REMEDY:

PROBLEM 16 (Chapter 3 Problem several. 13, a, b, 7):

SOLUTION:



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