| US 11,757,695 B2 | ||
| Predistortion system with targeted spectrum emission for wireless communication | ||
| Ruikang Yang, Bridgewater, NJ (US); Michael Russo, Morris Plains, NJ (US); and Simon Hamparian, Emerson, NJ (US) | ||
| Assigned to SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC., Yokohama (JP) | ||
| Filed by SUMITOMO ELECTRIC DEVICE INNOVATIONS, INC., Yokohama (JP) | ||
| Filed on Dec. 6, 2021, as Appl. No. 17/542,710. | ||
| Prior Publication US 2023/0179467 A1, Jun. 8, 2023 | ||
| Int. Cl. H04L 25/49 (2006.01); H04L 27/36 (2006.01); H04L 27/38 (2006.01); H04L 27/26 (2006.01) | ||
| CPC H04L 27/367 (2013.01) [H04L 27/2695 (2013.01); H04L 27/3836 (2013.01)] | 21 Claims |
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1. A transmitter system comprising:
an intermodulation distortion (IMD) filter module configured to filter a detected feedback signal (Yin) to generate a targeted filtered signal (Yout), the IMD filter module comprising:
a gain mask generating module configured to generate a gain mask based on at least one transmission measurement;
a gain mask processing module configured to apply the gain mask to the detected feedback signal (Yin);
a filter design generating module configured to generate a signal filter based on at least one transmission requirement; and
a targeted filtered signal generating module configured to generate the targeted filtered signal (Yout) based on the signal filter;
a digital pre-distortion (DPD) coefficient estimation module configured to update signal generation coefficients based on comparing an input signal (Sin) with the targeted filtered signal (Yout); and a distortion compensation processing module configured to generate a pre-distorted signal (Uout) based on the input signal (Sin) using the updated signal generation coefficients. |