A Low-Complexity Digital Predistortion Technique for Digital I/Q Transmitters
Mohammadreza Beikmirza (TU Delft - Electronics)
Leo C.N. De Vreede (TU Delft - Electronics)
Morteza S. Alavi (TU Delft - Electronics)
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Abstract
This paper presents an advanced yet simple digital pre-distortion (DPD) technique for digital I/Q transmitters (DTXs). Exploiting the I/Q orthogonality, an effective 2×1-D DPD procedure is proposed to bypass the exhaustive 2-D search of the entire constellation diagram. Utilizing this technique, a four-way Doherty DTX is linearized. Measurement results demonstrate that for a non-contiguous six-carrier OFDM-QAM signal with aggregated bandwidth of 150MHz, the ACPR is better than -47.3dBc, and EVM is better than -41/-40dB for channel-1/-6, respectively.