Please answer all of them Identify each statement below as either True(T) or Fal

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Please answer all of them

Identify each statement below as either True(T) or False(F) True white noise can never exist in a physical system. The noise bandwidth of a simple RC filter is equal to its cutoff frequency. The noise figure of an amplifier usually depends on the source resistance driving the amplifier. Alias distortion results from a non-flat passband shape in the reconstruction filter. Pulses can exist that are both band-limited and ISI-free. A matched filter is designed to match the PSD of the incoming noise. Delta modulation is a form of PAM in which the pulse shapes are triangular. Any cumulative distribution function (CDF) is monotone increasing A random message sent in Manchester code (biphase format) passes higher frequencies through the channel than the same message sent in bipolar NRZ format. If the ensemble mean of a random process is constant over time, the process can be considered ergodic.

Explanation / Answer

1. False. True White noise will exist in spectrums at high frequencies with other noises.

2.False. A sinmple RC filter's noise bandwidth is not always equals to it;s cutoff frequency it depends on the quality factor of the circuit mostly.

3.FALSE. Noise figure or FOM is always depends on the noise genreated inside the circuit i.e. at the resistors which are biased in the Circuitso, The Noise figure depends on the internal resistance rather than source resistance.

4.TRUE.Aliasing effect effect in sampling at the input side due to, the less sample frequency utilised. If aliasing occurs then the reconstructed signal will have frequency and magnitude losses which inturn results in distorted output or non linear output.

5.FALSE. Practical pulses always consits of infite number of frequencies in it. We band limit them to comprise into a digital signal. And Practically all signals has some ISI we reduce this by choosing appropriate nyquist rate and guard bands.

6.TRUE. A matched filter is designed to match the power spectral of the incoming signal to eliminate the noise in it.

7.FALSE. Delta modulation is a form of PCM in which we have only 2 steps as +d and -d. And these are steps are not in triangular form they are most likely step signals.

8.TRUE. Any CDF is a monotone and increasing.

9.TRUE manchester code doesn't reach the equivalent -ve point as the NRZ coding does so, it deals in higher frequency than NRZ coding

10.TRUE.

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