Why do you need both error correction capability and ARQ in a cellular system? Explain clearly.
What will be an ideal response?
In a cellular system, the last communication link is between the BS and the MS.
The wireless link is exposed to loss and interference in the open air medium and
hence the error rate is much higher than the wired link.
Error correction techniques and ARQ schemes can provide an elegant way to
implement end-to-end error-free transmission. Error correction capability can
improve the link quality. It will decrease the probability of retransmission.
However, channel coding cannot correct all the errors in the transmission.
Hence, the ARQ is also necessary if we need the error-free transmission.
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Radioactive mass 1 emits particles at a mean rate of ?1 per second, and radioactive mass 2 emits particles at a mean rate of ?2 per second. Mass 1 is selected with probability p, and mass 2 is selected with probability 1 – p. Let X be the time at which the first particle is emitted. It can be shown that X has a mixed exponential distribution with probability density function
a. Find 
.
b. Find the cumulative distribution function of X.
c. Let ?1 = 2, ?2 = 1, and p = 0.5. Find P(X ? 2).
d. Let ?1 = 2, ?2 = 1, and p = 0.5. Given that P(X ? 2), find the probability that mass 1 was selected.
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What will be an ideal response?
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Answer the following statement true (T) or false (F)
Generally, ____________________ raceway wiring is the approved method for raceway wiring.
Fill in the blank(s) with the appropriate word(s).