Patent ID: 7567501

Claim:
A method of receiving transmitted digital data in a receiver, comprising the steps of, cyclically transmitting frames comprising: a first number of symbols according to a first keying mode using a first constellation; a second number of symbols according to a second keying mode using a second constellation, whereby the first constellation includes more signaling points than the second constellation; and the first and second keying modes being used at predetermined positions in the frame, whereby both the symbols according to the first and second keying mode carry information under at least an operative traffic phase; and applying a weighting function in the receiver to an error control signal for symbols coded according to the first keying mode, wherein the error control signal is reduced when the detected error control signal approaches decision boundaries of the first keying mode; and subduing responses outside the decision boundaries of the given detected symbol of the first keying mode, wherein no weighting function is applied to symbols associated with the second keying mode.