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We study the performance of the transmission system by channel capacity or BER/SER. If the system performance is studied as BER/SER, does it make sense to study a channel capacity?

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Channel Capacity and Bit/Symbol Error rate are two different key performance indicators (KPI) of a system.

BER/SER, as it's obvious from its name, is the number of Bit/Symbol errors divided by the total number of transferred Bits/Symbols. and you can use channel coding to improve it so it's not a fixed KPI.
while Channel Capacity is maximum rate that the system can achieve and it's a fixed KPI.

so it make sense to study the channel capacity of your system. by studying channel capacity you find maximum rate that can be achieved and by improving BER/SER you can improve rate of system to get close to channel capacity.

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    $\begingroup$ "number of errors per Bit/Symbol", typo? SER (or BER) is symbol (or bit) error rate, e.g. 1 error per 10000 symbols (or bits(. $\endgroup$ – P2000 Sep 4 at 16:16
  • $\begingroup$ @P2000 I changed it. is it better now? $\endgroup$ – m-sh-shokouhi Sep 5 at 14:01

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