Abstract
The channel noise limits the transmission rate, not the error rate, and as long as the transmission rate is less than the channel capacity, it is possible to design a virtually error-free transmission using error-control coding. The focus of this chapter is on error-control coding, as coding can accomplish its purpose through deliberate introduction of redundancy bits into message bits. The redundancy bits, which are derived from the message bits as well as the code features and parameters, can provide a level of error detection and correction; however, it cannot guarantee that an error will always be detectable or correctable. At the expense of the channel bandwidth, error-control coding can reduce the bit error rate for a fixed transmitted power and/or reduce the transmit power for a fixed bit error rate.
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