A communication system sends data in the form of packets of fixed length. Noise in the communication
Question:
(a) Determine the average number of transmissions that are necessary before a packet is received correctly. Draw a state diagram for this problem.
(b) Let the the transmission time be Tt seconds for a packet. If the packet is received incorrectly, then a message is sent back to the transmitter stating that the message was received incorrectly. Let the time for sending such a message be Ta. Assume that if the packet is received correctly that we do not send an acknowledgment. What is the average time for a successful transmission? Draw a state diagram for this problem.
(c) Now suppose there are three nodes. The packet is to be sent from node 1 to node 2 to node 3 without an error. The probability of the packets being received incorrectly at each node is the same and is q. The transmission time is Tt and the time to acknowledge that a packet is received incorrectly is Ta. Draw a state diagram for this problem. Determine the average time for the packet to reach node 3 correctly.
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Related Book For
Probability and Random Processes With Applications to Signal Processing and Communications
ISBN: 978-0123869814
2nd edition
Authors: Scott Miller, Donald Childers
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