Example
If the uncoded BPSK system in AWGN environment has a Bit error rate (BER) of at the SNR level 4dB, and the corresponding coded (e.g., BCH) system has the same BER at an SNR level of 2.5dB, then we say the coding gain = 4dB-2.5dB = 1.5dB, due to the code used (in this case BCH).
Read more about this topic: Coding Gain
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