The link level performance, on the other hand, assesses the behaviour of realistic transceivers in terms of error-rates versus the receiver signal-to-noise ratio (SNR). Error rates ofinterest are the bit-error-rate (BER), symbol-error-rate (SER) and frame-error-rate (FER).BER and SER are of importance when comparing various modulation or coding schemes,whereas modern packet based systems are gauged by the FER
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