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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1$\begingroup$ "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(. $\endgroup$– P2000Commented Sep 4, 2020 at 16:16
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$\begingroup$ @P2000 I changed it. is it better now? $\endgroup$ Commented Sep 5, 2020 at 14:01