Multi-Carrier TD-SCDMA Power Amplifier Linearization with a Memory Polynomial Predistorter

In this paper, digital pre-distorter based on the memory polynomial model is utilized to compensate the nonlinearity of the Multi-Carrier TD-SCDMA RF power amplifiers (RFPA). Three-carrier TD-SCDMA signals with three different sub-frame configurations are used as test signals, a 47-dBm peak-envelope-power LDMOS power amplifier is designed to validate the performance of the pre-distorter. The digital pre-distorter is built in Advanced Design System (ADS) and applied to the test signal. It was found that the training data sequences may seriously affect the linearization performance of a digital pre-distorter for a TD-SCDMA system.

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