Patent ID: 8526537

Claim:
A Digital Pre-Distortion (DPD), processing method in a Time Division-Synchronization Code Division Multiple Access (TD-SCDMA) system or in a Lone Term Evolution-Time Division Duplex (LTE-TDD) system, comprising the steps of: transmitting a training signal into at least one radio frequency front-end device; acquiring the output training signal of the radio frequency front-end device over a feedback channel; training DPD coefficients of the radio frequency front-end device; and updating the DPD coefficients of the corresponding radio frequency front-end device upon completion of training the DPD coefficients; wherein, in the TD-SCDMA system, the training signal is generated by: generating random numbers in a normal distribution to simulate a signal source resulting from combining a plurality of users with a data length determined as required for training of the DPD coefficients; performing encoding, modulating and spreading with the same channel encoding, modulation and spread spectrum modes for each user; adjusting in gain encoded, modulated and spread signals; combining a plurality of user signals transmitted over the same carrier; performing Digital Up Conversion, DUC, and Crest Factor Reduction, CFR, on the combined user signals and then generating a multi-carrier digital intermediate-frequency signal; and adopting the multi-carrier digital intermediate-frequency signal as the training signal or wherein, in the LTE-TDD system, the training signal is generated by: performing 3GPP-compliant Orthogonal Frequency Division Multiplexing (OFDM) modulation on a random sequence and then generating a baseband transmission signal; performing Digital Up Conversion (DUC) and Crest Factor Reduction (CFR) on the baseband transmission signal to generate a digital intermediate-frequency signal; and adopting the generated baseband transmission signal or the generated digital intermediate-frequency signal as the training signal.