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A 4-/16-/64-/256-QAM demodulator LSI with an all-digital carrier-recovery loop including a novel phase detector and a fractionally-/ symbol-spaced equalizer is described. The phase detector, deciding the transmitted symbol from received signal power, detects the phase error up to ??45?? and enables the loop to internally eliminate the ??80 KHz carrier-frequency offset. The fractionally-spaced equalizer...
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