The term \'ensemble\' refers to the set of all random variables associated with
ID: 2083889 • Letter: T
Question
The term 'ensemble' refers to the set of all random variables associated with a random process. A random message sent in Manchester code (biphase format) passes higher frequencies through the channel than the same message sent in bipolar NRz format. Envelope detection of AM signal results in an SNR value exactly one-half of the SNR achieved with synchronous detection. True white noise can never exist in a physical system. The binomial probability distribution applies to any repeated experiment in which there are two complementary events and the trials are independent of one another. Gray coding assures that the most likely errors single-bit errors, keeping the BER as low as possible. Noise figure, noise temperature, and equivalent input noise are different ways of describing the same property. Delta modulation is a form of PAM in which the pulse shapes are triangular. Alias distortion results from a non-flat passband shape in the reconstruction filter. Raised-cosine pulses are the only pulses that meet the Nyquist criterion for operation. ISI-free operation.Explanation / Answer
1. TRUE
2. FALSE -NRZ format is at higher frequencies.
3.TRUE-Its a mirror image in synchronous detection that's why one-half of the SNR is achieved
4.FALSE-white noise exists in the physical system.
5.TRUE-Consider many trails of an event that can have one outcome with probability p (such as flipping a coin and seeing a head, and an alternative with probability 1-p (such as seeing a tail. In n trails, the probability p(x) to see x heads and n-x tails, independent of the particular order in which they were seen, is found by adding up the probability of each outcome times the number of equivalents arrangements.
6.TRUE- errors are single bit errors.
7.TRUE- properties are same but equivalent noise input is the sum of noise temperature.
8.FALSE-Delta modulation is a form of PCM(pulse code modulation).
9.FALSE- if all the samples are a constant value, the reconstruction will be a flat constant signal.
10.TRUE
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