Patent ID: 7095800

Claim:
Digital precoding filter for a transmission filter for minimizing the crest factor of the signal output by the transmission filter, having: a) a modulo adder of the source data symbols which are received from a data symbol source at a signal input of the precoding filter, and added with fedback filtered transmission data symbols to transmission output data symbols which are output to the downstream transmission filter via a signal output of the precoding filter; b) a digital feedback filter which filters the transmission output data symbols present at the signal output and feeds them back to the modulo adder; wherein c) a digital correction filter is connected to the signal output, the filter coefficients of the digital correction filter being set as a function of the pulse response of the transmission filter in the case of that sampling phase (τ) for which the output signal of the transmission filter has a maximum value, d) an adder is provided which adds the signal present at the output of the correction filter to the received source data symbols, and e) a subtracter is provided which subtracts the signal present at the output of the correction filter from the signal output by the modulo adder.