Apparatus and method for generating an error signal
AssigneeNtt Docomo, Inc.
InventorAndreas Saul
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Abstract
The invention relates to an apparatus for generating an error signal from an input signal, the error signal to be used for generating a transmit signal, the apparatus comprising: distorter for distorting the input signal to obtain a distorted signal, calculator for calculating a preliminary error signal representing a difference between the input signal and the distorted signal or representing the input signal, manipulator for manipulating the preliminary error signal to obtain the error signal, wherein the manipulator for manipulating is configured for varying a preliminary error signal value to obtain an error signal value which is non-equal to zero.
Claims35
Apparatus for generating an error signal from an input signal, the input signal comprising a signal peak, the error signal to be combined with the input signal for generating a transmit signal having a reduced signal peak, the apparatus comprising:
- means for a limiting the input signal to obtain a limited signal;
- means for calculating a preliminary error signal representing a difference between the input signal and the limited signal or representing the input signal, wherein the preliminary error signal comprises a number of preliminary error signal values;
- means for manipulating the preliminary error signal to obtain the error signal, wherein the means for manipulating is configured for varying a preliminary error signal value to obtain an error signal value which is non-equal to zero, and such that the error signal value is in a predetermined value range associated with a predetermined area in a signal space domain,
- wherein the means for manipulating is further configured, for the case the preliminary error signal value does not meet a property requirement, for back manipulating the preliminary error signal value to obtain an error signal value such that the error signal value is associated with a signal space constellation point being within a further predetermined area in the single space domain but outside the predetermined area, the further predetermined area being wider than the predetermined area.
A method for generating an error signal from an input signal, the input signal comprising a signal peak, the error signal to be combined with the input signal for generating a transmit signal having a reduced signal peak, the method comprising the following steps:
- limiting the input signal to obtain a limited signal;
- calculating a preliminary error signal representing a difference between the input signal and the limited signal or representing the input signal;
- varying a preliminary error signal value to obtain an error signal value which is non-equal to zero, and such that the error signal value is in a predetermined value range associated with a predetermined area in a signal space domain,
- wherein the step of varying is performed such that, for the case that the preliminary error signal value does not meet a property requirement, the preliminary error signal value is back manipulated to obtain an error signal value such that the error signal value is associated with the signal space constellation point being within a further predetermined area in the signal space domain hut outside the predetermined area, the further predetermined area being wider the predetermined area.
Dependencies are inferred from the claim text.