3. The channel bit error rate is 0.00001, and each packet’s total length is 1024 bytes including all overheads. Assume there are no other overheads. For each data packet transmitted over the wireless channel, what is the Packet Error Rate (PER) for each single round of packet delivery? If one ARQ retry is applied, (i.e. total rounds of transmissions are 2, including 1 initial transmission, and 1 additional retry), what is the final average probability of packet error? (1 point)

Respuesta :

Answer:

The answer is 0.08192%.

Explanation:

1 byte consists of 8 bits so for a total packet length of 1024 bytes, there are 8192 bits. The channel has a bit error rate of 0.00001 or 0.001%.

For each data packet transmitted with no overhead, the packet error rate (PER) would be 0.0008192 or 0.08192%. for each single round of packet delivery.

I hope this answer helps.

Following are the calculation to the final average probability of packet error:

bit error rate= [tex]0.00001[/tex]

The packet length is [tex]=1024\ bytes[/tex]

A byte is[tex]= 8\ bits.[/tex]

As just a result, the overall bit size of the packet is [tex]1024 \times 8 = 8192\ bits.[/tex]

As just a result, for each packet header transmitted with really no overhead,

[tex]PER = 0.00001\times 8192 = 0.08192[/tex]

As just a result, [tex]8.192\%[/tex] of the packet will be damaged.

When  [tex]8.192\%[/tex]  of damaged transmissions have indeed been retried, then    [tex]8.192\%[/tex] of try packets will fail as well.

This indicates that [tex](0.08192)^2[/tex] will fail.  

[tex]\to (0.08192)^2 = 0.00671[/tex]

As just a result, with a single retry,[tex]0.671\%[/tex] of all packets would fail.  We may just multiply them together as each retry is an individual probability.

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