# Question

A communication system sends data in the form of packets of fixed length. Noise in the communication channel may cause a packet to be received incorrectly. If this happens, then the packet is retransmitted. Let the probability that a packet is received incorrectly be q. Determine the average number of transmissions that are necessary before a packet is received correctly.

## Answer to relevant Questions

In Exercise 4.90 let the transmission time be Tt seconds for a packet. If the packet was received incorrectly, then a message is sent back to the transmitter that states that the message was received incorrectly. Let the ...Find an expression for the even moments of a Rayleigh random variable. That is, find E [Y2m] for any positive integer m if the random variable, Y , has a PDF given by For a Gaussian random variable, derive expressions for the coefficient of skewness and the coefficient of kurtosis in terms of the mean and variance, µ and σ2. A random variable has a CDF given by (a) Find the mean of X; (b) Find the variance of X; (c) Find the coefficient of skewness of X; (d) Find the coefficient of kurtosis of X. Suppose X is uniformly distributed over (– a, a), where a is some positive constant. Find the PDF of Y= X2.Post your question

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