Consider the SW-ARQ protocol in which the packet size is n bits. Forward Error Correction (FEC) is used to improve the performance. The FEC code employed can correct up to 2 bits in error per packet. In other words, the packet is in error iff the number of error bits during transmission is greater than 2. (a) If the bit error rate is 0.002, and packet size n = 125 bytes, what is the packet error rate? (b) Assume that there is no errors in the acknowledgments, what is the av- erage number of retransmissions for a packet? (c) If the feedback channel also has a bit error rate of 0.001, and the ac- knowledgment packet size is 25 bytes, no FEC code employed for the ac- knowladamante tha hit in in

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Consider the SW-ARQ protocol in which the packet size is n bits. Forward
Error Correction (FEC) is used to improve the performance. The FEC code
employed can correct up to 2 bits in error per packet. In other words, the
packet is in error iff the number of error bits during transmission is greater
than 2.
(a) If the bit error rate is 0.002, and packet size n = 125 bytes, what is the
packet error rate?
(b) Assume that there is no errors in the acknowledgments, what is the av-
erage number of retransmissions for a packet?
(c) If the feedback channel also has a bit error rate of 0.001, and the ac-
knowledgment packet size is 25 bytes, no FEC code employed for the ac-
knowledgments (i.e., the acknowledgment is in error if any of its bit is in
error), what is the average number of retransmissions for a packet?
[Think:] how to determine the throughput of GBN-ARQ and SR-ARQ, con-
sidering the error rate of acknowledgments?
Transcribed Image Text:Consider the SW-ARQ protocol in which the packet size is n bits. Forward Error Correction (FEC) is used to improve the performance. The FEC code employed can correct up to 2 bits in error per packet. In other words, the packet is in error iff the number of error bits during transmission is greater than 2. (a) If the bit error rate is 0.002, and packet size n = 125 bytes, what is the packet error rate? (b) Assume that there is no errors in the acknowledgments, what is the av- erage number of retransmissions for a packet? (c) If the feedback channel also has a bit error rate of 0.001, and the ac- knowledgment packet size is 25 bytes, no FEC code employed for the ac- knowledgments (i.e., the acknowledgment is in error if any of its bit is in error), what is the average number of retransmissions for a packet? [Think:] how to determine the throughput of GBN-ARQ and SR-ARQ, con- sidering the error rate of acknowledgments?
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