The bit rate is the ratio of the actually transmitted data code with the error correction code excluded to the theoretical value.
the transmission should be lossless according to the coding mode. However, the actual situation is not as good as this. During actual transmission, some information codes used for error correction need to be added. Redundancy is used for achieving high reliability. The bit rate is the ratio of the actually transmitted data code with the error correction code excluded to the theoretical value.
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