Abstract
Digital Predistortion (DPD) is one of the most widely used method for improving linearization of power amplifier (PA). Power amplifier with DPD can also be used to achieve high speed data transmission for micro-nano satellites. Since effectively reducing the cost and power consumption of power amplifier with DPD is very important for micro-nano satellites, the method of undersampling used in DPD is proposed. The undersampling method provides sufficient linearization with less sampling rate for DPD compared with traditional structure. The way of undersampling in the feedback path can dramatically reduce the power consumption and cost of the DPD system. The proposed solution is proved feasible in theory, the simulation results show that the proposed method of DPD system improves the third-order intermodulation of the power amplifier by about 19 dB. And the experimental results show that the proposed method achieves the performance equivalent to that using the conventional method of five times oversampling. The proposed method also makes DPD become practically implementable for micro-nano satellites.
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