Extended base band multicarrier system

A method for linearizing an amplifier to produce an amplified output signal from a set of carrier frequencies, the method comprising:

• linearly combining a set of digital baseband signals corresponding to the set of carrier frequencies to produce an extended digital baseband signal;
• computing a look-up table using power values of the extended digital baseband signal as look-up values wherein the look-up table is a function of pre-measured calibration data;
• and
• applying the look-up table to the extended digital baseband signal for producing a predistorted signal;
• amplifying the predistorted signal;
• and
• producing the amplified output signal which is linearly related to the set of digital baseband signals.

A method for linearizing an amplifier to produce an amplified output signal from a set of carrier frequencies, the method comprising:

• linearly combining a set of digital baseband signals corresponding to the set of carrier frequencies to produce an extended digital baseband signal;
• computing a look-up table using power values of the extended digital baseband signal as look-up values wherein the look-up table is a function of pre-measured calibration data;
• and
• applying the look-up table to each digital baseband signal in the set of digital baseband signals for producing a set of predistorted signals;
• amplifying the set of predistorted signals;
• and
• producing the amplified output signal which is linearly related to the set of digital baseband signals.

A semiconductor device comprising;

• a signal combining element for linearly combining a set of digital baseband signals corresponding to a set of carrier frequencies to produce an extended digital baseband signal;
• a memory for storing a look-up table wherein the look-up table uses power values of the extended digital baseband signal as look-up values;
• at least one complex mixer for applying the look-up table to a selected one of the extended digital baseband signal and the set of digital baseband signals for producing at least one predistorted signal;
• an amplifier for receiving and amplifying the at least one predistorted signal;
• and
• wherein an amplified output signal is produced which is linearly related to the digital input signals.