Dual-layered predistortion system for wireless communication

19:

• A transmitter system comprising:
• a signal decomposition module configured to extract a low-frequency input signal (Slo) and a high-frequency input signal (Shi) from an input signal (Sin);
• a low-frequency primary digital predistortion (DPD) layer comprising:
• a low-frequency DPD coefficient estimation module configured to update low-frequency primary signal generation coefficients based on a low-frequency secondary predistorted signal (Ulo), a high-frequency secondary predistorted signal (Uhi), and a low-frequency detected feedback signal (Ylo), and
• a low-frequency primary distortion compensation processing module configured to generate a low-frequency primary predistorted signal (Ulo′) based on the low-frequency secondary predistorted signal (Ulo) and a high-frequency secondary predistorted signal (Uhi) using the updated low-frequency primary signal generation coefficients;
• a high-frequency primary DPD layer comprising:
• a high-frequency DPD coefficient estimation module configured to update high-frequency primary signal generation coefficients based on the low-frequency secondary predistorted signal (Ulo), the high-frequency secondary predistorted signal (Uhi), and a high-frequency detected feedback signal (Yhi), and
• a high-frequency primary distortion compensation processing module configured to generate a high-frequency primary predistorted signal (Uhi′) based on the low-frequency secondary predistorted signal (Ulo) and the high-frequency secondary predistorted signal (Uhi) using the updated high-frequency primary signal generation coefficients;
• a signal combining module configured to combine the low-frequency primary predistorted signal (Ulo′) and the high-frequency primary predistorted signal (Uhi′);
• a low-frequency secondary DPD layer comprising:
• a low-frequency signal characteristic estimation module configured to update low-frequency secondary signal generation coefficients based on the low-frequency input signal (Slo), the high-frequency input signal (Shi), and the detected low-frequency feedback signal (Ylo), and
• a low-frequency secondary distortion compensation processing module configured to generate the low-frequency secondary predistorted signal (Ulo) based on the low-frequency input signal (Slo) and the high-frequency input signal (Shi) using the updated low-frequency secondary signal generation coefficients;
• and
• a high-frequency secondary DPD layer comprising:
• a high-frequency signal characteristic estimation module configured to update high-frequency secondary signal generation coefficients based on the low-frequency input signal (Slo), the high-frequency input signal (Shi), and the detected high-frequency feedback signal (Yhi), and
• a high-frequency secondary distortion compensation processing module configured to generate the high-frequency secondary predistorted signal (Uhi) based on the low-frequency input signal (Slo) and the high-frequency input signal (Shi) using the updated high-frequency secondary signal generation coefficients.

20:

• A method comprising:
• extracting, by a signal decomposition module, a low-frequency input signal (Slo) and a high-frequency input signal (Shi) from an input signal (Sin);
• updating, by a low-frequency signal characteristic estimation module of a low-frequency secondary digital predistortion (DPD) layer, low-frequency secondary signal generation coefficients based on the low-frequency input signal (Slo), the high-frequency input signal (Shi), and a low-frequency detected feedback signal (Ylo);
• generating, by a low-frequency secondary distortion compensation processing module of the low-frequency secondary DPD layer, a low-frequency secondary predistorted signal (Ulo) based on the low-frequency input signal (Slo) and the high-frequency input signal (Shi) using the updated low-frequency secondary signal generation coefficients;
• updating, by a high-frequency signal characteristic estimation module of a high-frequency secondary DPD layer, high-frequency secondary signal generation coefficients based on the low-frequency input signal (Slo), the high-frequency input signal (Shi), and a high-frequency detected feedback signal (Yhi);
• generating, by a high-frequency secondary distortion compensation processing module of the high-frequency secondary DPD layer, a high-frequency secondary predistorted signal (Uhi) based on the low-frequency input signal (Slo) and the high-frequency input signal (Shi) using the updated high-frequency secondary signal generation coefficients;
• updating, by a low-frequency DPD coefficient estimation module of a low-frequency primary DPD layer, low-frequency primary signal generation coefficients based on a low-frequency secondary predistorted signal (Ulo), a high-frequency secondary predistorted signal (Uhi), and the low-frequency detected feedback signal (Ylo);
• generating, by a low-frequency primary distortion compensation processing module of the low-frequency primary DPD layer, a low-frequency primary predistorted signal (Ulo′) based on the low-frequency secondary predistorted signal (Ulo) and a high-frequency secondary predistorted signal (Uhi) using the updated low-frequency primary signal generation coefficients;
• updating, by a high-frequency DPD coefficient estimation module of a high-frequency primary DPD layer, high-frequency primary signal generation coefficients based on the low-frequency secondary predistorted signal (Ulo), the high-frequency secondary predistorted signal (Uhi), and the high-frequency detected feedback signal (Yhi);
• generating, by a high-frequency primary distortion compensation processing module of the high-frequency primary DPD layer, a high-frequency primary predistorted signal (Uhi′) based on the low-frequency secondary predistorted signal (Ulo) and the high-frequency secondary predistorted signal (Uhi) using the updated high-frequency primary signal generation coefficients;
• and
• combining, by a signal combining module, the low-frequency primary predistorted signal (Ulo′) and the high-frequency primary predistorted signal (Uhi′).

21:

• A non-transitory computer-readable medium storing instructions therein which, when run on a processor, causes the processor to:
• extract a low-frequency input signal (Slo) and a high-frequency input signal (Shi) from an input signal (Sin);
• update low-frequency secondary signal generation coefficients of a low-frequency secondary digital predistortion (DPD) layer based on the low-frequency input signal (Slo), the high-frequency input signal (Shi), and a low-frequency detected feedback signal (Ylo);
• generate a low-frequency secondary predistorted signal (Ulo) based on the low-frequency input signal (Slo) and the high-frequency input signal (Shi) using the updated low-frequency secondary signal generation coefficients;
• update high-frequency secondary signal generation coefficients of a high-frequency secondary DPD layer based on the low-frequency input signal (Slo), the high-frequency input signal (Shi), and a high-frequency detected feedback signal (Yhi);
• generate a high-frequency secondary predistorted signal (Uhi) based on the low-frequency input signal (Slo) and the high-frequency input signal (Shi) using the updated high-frequency secondary signal generation coefficients;
• update low-frequency primary signal generation coefficients of a low-frequency primary DPD layer based on a low-frequency secondary predistorted signal (Ulo), a high-frequency secondary predistorted signal (Uhi), and the low-frequency detected feedback signal (Ylo);
• generate a low-frequency primary predistorted signal (Ulo′) based on the low-frequency secondary predistorted signal (Ulo) and a high-frequency secondary predistorted signal (Uhi) using the updated low-frequency primary signal generation coefficients;
• update high-frequency primary signal generation coefficients of a high-frequency primary DPD layer based on the low-frequency secondary predistorted signal (Ulo), the high-frequency secondary predistorted signal (Uhi), and the high-frequency detected feedback signal (Yhi);
• generate a high-frequency primary predistorted signal (Uhi′) based on the low-frequency secondary predistorted signal (Ulo) and the high-frequency secondary predistorted signal (Uhi) using the updated high-frequency primary signal generation coefficients;
• and
• combine the low-frequency primary predistorted signal (Ulo′) and the high-frequency primary predistorted signal (Uhi′).

22:

• A transmitter system comprising:
• a signal decomposition module configured to extract a low-frequency input signal (Slo) and a high-frequency input signal (Shi) from an input signal (Sin);
• a low-frequency intermodulation distortion filter module configured to filter a detected low-frequency feedback signal (Ylo) to generate a targeted low-frequency filtered signal (Ylo′);
• a high-frequency intermodulation distortion filter module configured to filter a detected
• high-frequency feedback signal (Yhi) to generate a targeted high-frequency filtered signal (Yhi′);
• a low-frequency primary digital predistortion (DPD) layer comprising:
• a low-frequency DPD coefficient estimation module configured to update low-frequency primary signal generation coefficients based on a low-frequency secondary predistorted signal (Ulo), a high-frequency secondary predistorted signal (Uhi), and the targeted low-frequency filtered signal (Ylo′), and
• a low-frequency primary distortion compensation processing module configured to generate a low-frequency primary predistorted signal (Ulo′) based on the low-frequency secondary predistorted signal (Ulo) and a high-frequency secondary predistorted signal (Uhi) using the updated low-frequency primary signal generation coefficients;
• a high-frequency primary DPD layer comprising:
• a high-frequency DPD coefficient estimation module configured to update high-frequency primary signal generation coefficients based on the low-frequency secondary predistorted signal (Ulo), the high-frequency secondary predistorted signal (Uhi), and the targeted high-frequency filtered signal (Yhi′), and
• a high-frequency primary distortion compensation processing module (configured to generate a high-frequency primary predistorted signal (Uhi′) based on the low-frequency secondary predistorted signal (Ulo) and the high-frequency secondary predistorted signal (Uhi) using the updated high-frequency primary signal generation coefficients;
• a signal combining module configured to combine the low-frequency primary predistorted signal (Ulo′) and the high-frequency primary predistorted signal (Uhi′);
• a low-frequency secondary DPD layer comprising:
• a low-frequency signal characteristic estimation module configured to update low-frequency secondary signal generation coefficients based on the low-frequency input signal (Slo), the high-frequency input signal (Shi), and the targeted low-frequency filtered signal (Ylo′), and
• a low-frequency secondary distortion compensation processing module configured to generate the low-frequency secondary predistorted signal (Ulo) based on the low-frequency input signal (Slo) and the high-frequency input signal (Shi) using the updated low-frequency secondary signal generation coefficients;
• and
• a high-frequency secondary DPD layer comprising:
• a high-frequency signal characteristic estimation module configured to update high-frequency secondary signal generation coefficients based on the low-frequency input signal (Slo), the high-frequency input signal (Shi), and the targeted high-frequency filtered signal (Yhi′), and
• a high-frequency secondary distortion compensation processing module configured to generate the high-frequency secondary predistorted signal (Uhi) based on the low-frequency input signal (Slo) and the high-frequency input signal (Shi) using the updated high-frequency secondary signal generation coefficients.

23:

• A method comprising:
• extracting, by a signal decomposition module, a low-frequency input signal (Slo) and a high-frequency input signal (Shi) from an input signal (Sin);
• generating, by a low-frequency intermodulation distortion filter module, a targeted low-frequency filtered signal (Ylo′) by filtering a detected low-frequency feedback signal (Ylo);
• generating, by a high-frequency intermodulation distortion filter module, a targeted high-frequency filtered signal (Yhi′) by filtering a detected high-frequency feedback signal (Yhi);
• updating, by a low-frequency signal characteristic estimation module of a low-frequency secondary digital predistortion (DPD) layer, low-frequency secondary signal generation coefficients based on the low-frequency input signal (Slo), the high-frequency input signal (Shi), and the targeted low-frequency filtered signal (Ylo′);
• generating, by a low-frequency secondary distortion compensation processing module of the low-frequency secondary DPD layer, a low-frequency secondary predistorted signal (Ulo) based on the low-frequency input signal (Slo) and the high-frequency input signal (Shi) using the updated low-frequency secondary signal generation coefficients;
• updating, by a high-frequency signal characteristic estimation module of a high-frequency secondary DPD layer, high-frequency secondary signal generation coefficients based on the low-frequency input signal (Slo), the high-frequency input signal (Shi), and the targeted high-frequency filtered signal (Yhi′);
• generating, by a high-frequency secondary distortion compensation processing module of the high-frequency secondary DPD layer, a high-frequency secondary predistorted signal (Uhi) based on the low-frequency input signal (Slo) and the high-frequency input signal (Shi) using the updated high-frequency secondary signal generation coefficients;
• updating, by a low-frequency DPD coefficient estimation module of a low-frequency primary DPD layer, low-frequency primary signal generation coefficients based on the low-frequency secondary predistorted signal (Ulo), the high-frequency secondary predistorted signal (Uhi), and the targeted low-frequency filtered signal (Ylo′);
• generating, by a low-frequency primary distortion compensation processing module of the low-frequency primary DPD layer, a low-frequency primary predistorted signal (Ulo′) based on the low-frequency secondary predistorted signal (Ulo) and the high-frequency secondary predistorted signal (Uhi) using the updated low-frequency primary signal generation coefficients;
• updating, by a high-frequency DPD coefficient estimation module of a high-frequency primary DPD layer, high-frequency primary signal generation coefficients based on the low-frequency secondary predistorted signal (Ulo), the high-frequency secondary predistorted signal (Uhi), and the targeted high-frequency filtered signal (Yhi′);
• generating, by a high-frequency primary distortion compensation processing module of the high-frequency primary digital predistortion layer, a high-frequency primary predistorted signal (Uhi′) based on the low-frequency secondary predistorted signal (Ulo) and the high-frequency secondary predistorted signal (Uhi) using the updated high-frequency primary signal generation coefficients;
• and
• combining, by a signal combining module, the low-frequency primary predistorted signal (Ulo′) and the high-frequency primary predistorted signal (Uhi′).

24:

• A non-transitory computer-readable medium storing instructions therein which, when run on a processor, causes the processor to:
• extract a low-frequency input signal (Slo) and a high-frequency input signal (Shi) from an input signal (Sin);
• generate a targeted low-frequency filtered signal (Ylo′) by filtering a detected low-frequency feedback signal (Ylo);
• generate a targeted high-frequency filtered signal (Yhi′) by filtering a detected high-frequency feedback signal (Yhi);
• update low-frequency secondary signal generation coefficients based on the low-frequency input signal (Slo), the high-frequency input signal (Shi), and the targeted low-frequency filtered signal (Ylo′);
• generate a low-frequency secondary predistorted signal (Ulo) based on the low-frequency input signal (Slo) and the high-frequency input signal (Shi) using the updated low-frequency secondary signal generation coefficients;
• update high-frequency secondary signal generation coefficients based on the low-frequency input signal (Slo), the high-frequency input signal (Shi), and the targeted high-frequency filtered signal (Yhi′);
• generate a high-frequency secondary predistorted signal (Uhi) based on the low-frequency input signal (Slo) and the high-frequency input signal (Shi) using the updated high-frequency secondary signal generation coefficients;
• update low-frequency primary signal generation coefficients based on the low-frequency secondary predistorted signal (Ulo), the high-frequency secondary predistorted signal (Uhi), and the targeted low-frequency filtered signal (Ylo′);
• generate a low-frequency primary predistorted signal (Ulo′) based on the low-frequency secondary predistorted signal (Ulo) and the high-frequency secondary predistorted signal (Uhi) using the updated low-frequency primary signal generation coefficients;
• update high-frequency primary signal generation coefficients based on the low-frequency secondary predistorted signal (Ulo), the high-frequency secondary predistorted signal (Uhi), and the targeted high-frequency filtered signal (Yhi′);
• generate a high-frequency primary predistorted signal (Uhi′) based on the low-frequency secondary predistorted signal (Ulo) and the high-frequency secondary predistorted signal (Uhi) using the updated high-frequency primary signal generation coefficients;
• and
• combine the low-frequency primary predistorted signal (Ulo′) and the high-frequency primary predistorted signal (Uhi′).