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Submitted By MOHITIITD
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Q1 Ten users empoly ALOHA to transmit 1000 bit packets of data. The data rate is 100 Mb/s. The data to be transmitted a distance d=10,000 Km. Assume NAK messages contain 100 bits and that is the event of a collision the average waiting time pair to retransmission is 50 µs.
a) Calculate delay as a function of ρ.
b) Plot D vs ρ.

Q2 500 users employ TDMA to transmit 1000 bit packets of data. The channel bandwidth is 100 MHz and QPSK is employed.
a) What is the max is the maximum allowable bit rate in the channel?
b) What is the packet rate?
c) What is the frame time – the time taken to transmit the packet from each user?

a) Plot the throughput for CSMA as given by eq 16.4.35 as a function of TD/ TP for ρ = 0.25.
b) At what value of TD/ TP , would slotted ALOHA field a higher throughput?

Q4 Assuming that packet transmission and retransmission can both be described as a Poisson process. Calculate the probability that a data packet transmission in slotted ALOHA system will experience a collision with one other user. Assume that the total traffic rate λ = 10 packets/sec, Tp = 10 ms.

Q5 Measurements of a slotted ALOHA channel shows that 20% of the slots are idle.
a) What is the normalized total traffic in the channel?
b) What is the normalized throughput?

Q6 A TDMA system operates at 100 Mb/s with a 2ms frame time. Assume that all slots are of equal length and that a guard time of 1µs is required between slots.
a) Compute the efficiency of the communication source for the case of 1, 10, and 100 slots per frame.
b) Repeat above plot a) assuming that a 100 bit preamble is required at the start of each slot. Compute efficiency of communication source.
-------------------------------------- frame K ------------------------------------- frame K+1
1 2 … Preamble M

Q7 6000…...

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