Digital pre-distortion processing method and apparatus

A digital pre-distortion processing apparatus 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:

• a training signal module configured to transmit a training signal into at least one radio frequency front-end device;
• an acquiring module configured to acquire the output training signal of the radio frequency front-end device over a feedback channel;
• a training module configured to train DPD coefficients of the radio frequency front-end device;
• and
• an updating module configured to update the DPD coefficients of the corresponding radio frequency front-end device upon completion of updating the coefficients;
• wherein in the TD-SCDMA system, the training signal module when generating the training signal comprises:
• a first random sequence generator configured to generate random numbers in a normal distribution to simulate a signal source resulting from combining a plurality of users;
• an encoding, modulating and spreading unit configured to perform encoding, modulating and spreading with the same channel encoding, modulation and spread spectrum modes for each user;
• a gain unit configured to adjust in gain encoded, modulated and spread signals;
• a combining unit configured to combine a plurality of user signals transmitted over the same carrier;
• a first DUC-CFR unit configured to perform digital up conversion and crest factor reduction on the combined user signals to generate a multi-carrier digital intermediate-frequency signal;
• and
• a first selecting unit configured to adopt the multi-carrier digital intermediate-frequency signal resulting from combining as the training signal
• or, wherein
• in the LTE-TDD system, the training signal module when generating the training signal comprises:
• a second random sequence generating unit configured to generate a random sequence;
• a baseband modulating unit configured to perform 3GPP-compliant OFDM modulation on the random sequence to generate a baseband transmission signal;
• a second DUC-CFR unit configured to perform DUC and CFR on the baseband transmission signal to generate a digital intermediate-frequency signal;
• and
• a second selecting unit configured to adopt the generated baseband transmission signal or the generated digital intermediate-frequency signal as the training signal.