Method and device for acquiring multi-frequency band digital predistortion output signals

摘要

The present invention relates to the communications field, discloses a method and device for acquiring multi-frequency band digital predistortion (DPD) output signals, enables the result of DPD processing to compensate the intermodulation of multi-frequency band signal combinations after PA, and improves the ACLR of the signals after PA. Specifically, when performing DPD processing on an input signal received on a working frequency band, reference must be made to the DPD coefficients generated from the feedback signals of the signals previously received on the working frequency band and on other working frequency bands, and to the input signals currently received on other working frequency bands. In other words, intermodulation between the input signals received on working frequency bands are taken into consideration during the DPD processing work flow, so that the result of DPD processing can compensate the intermodulation of the multi-frequency band signal combinations after PA, and improves the accuracy of DPD processing, thereby enhancing the ACLR after wide band power amplification.

主权项

1. A method for acquiring multi-band digital pre-distortion (DPD) output signals, comprising:
receiving at least two input signals in different working frequency bands; determining DPD coefficients corresponding to the input signals currently received in the respective working frequency bands, wherein a DPD coefficient corresponding to an input signal currently received in any working frequency band is obtained according to feedback signals of respective input signals previously received in the respective working frequency bands and an input signal previously received in the any working frequency band; and acquiring DPD output signals corresponding to the input signals currently received in the respective working frequency bands respectively according to the input signals currently received in the respective working frequency bands and their corresponding DPD coefficients, and input signals currently received in interfering frequency bands of the respective working frequency bands.