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Calculating Power from dBm Values

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Questions and Answers

What is the formula to calculate power in dBm?

dBm = 10 log10 Pm

Calculate the power of a signal with dBm = -30.

3.37

What is distortion in signals?

Distortion means that the signal changes its form or shape.

What are the different types of noise mentioned?

Thermal, Induced, Crosstalk, Impulse Signup and view all the answers

What does SNR stand for and what does it measure?

SNR stands for Signal to Noise Ratio. It measures the strength of the signal with respect to the noise power in the system. Signup and view all the answers

What is attenuation?

Loss of energy resulting in a weaker signal when a signal travels through a medium. Signup and view all the answers

In Example 3.31, if the power of a signal is 10 mW and the power of the noise is 1 μW, what are the values of SNR and SNRdB?

SNR = 10000, SNRdB = 40 Signup and view all the answers

How is attenuation measured?

Attenuation is measured using the unit 'decibel' (dB) where dB = 10log10 (P2/P1). Signup and view all the answers

If a signal's power is reduced to one-half, what is the attenuation in dB?

A loss of 3 dB (–3 dB) is equivalent to losing one-half the power. Signup and view all the answers

When a signal's power is increased 10 times, what is the amplification in dB?

The amplification is 10 dB when the signal's power is increased 10 times. Signup and view all the answers

What does SNR stand for?

Signal to Noise Ratio Signup and view all the answers

How is SNR calculated?

SNR is calculated as SNR = 10log10 (Signal Power / Noise Power). Signup and view all the answers

What are the factors that data rate depends on in data communications?

Bandwidth available, level of signals used, quality of the channel (level of noise) Signup and view all the answers

How does the bit rate of a system change with an increase in the number of signal levels?

The bit rate increases. Signup and view all the answers

What does the Nyquist Theorem state for a noiseless channel?

C = 2Blog2L, where L is the number of signal levels, C is the capacity in bps, and B is the bandwidth in Hz. Signup and view all the answers

What is the formula for calculating the capacity of a noiseless channel?

C = 2Blog2L Signup and view all the answers

What is the ideal ratio that we can never achieve in real life, related to signal and noise?

SNR and SNRdB Signup and view all the answers

In Example 3.34, with a bandwidth of 3000 Hz and two signal levels, what is the capacity in bps?

6000 bps Signup and view all the answers