Digital Predistortion (Dpd) Algorithm For 5g Applications

Abstract

The emerging technologies and trends in the Wireless Networks applications have been enormously changing and expect to have the capability of very high data rates and speeds which maybe hundred times faster with high quality in connection and signal levels. With this advancement and growth of Wireless communication systems, there is a lot of demand for linearity in power amplifier. Also the Radio Frequency (RF) power amplifiers, which are expected to work with signals having Wideband Code Division Multiple Access (WCDMA) and are used extensively in Universal Mobile Telecommunication Systems (UMTS) for the generation of out-of-band emissions named as “Spectral regrowth”. As there is a need for enhancing the linearity and efficiency of Power Amplifier, the proposed work used the approach of Digital Predistortion. The proposed work of Digital Pre Distortion was developed using Matlab/Simulink combining memory polynomial algorithm. This developed algorithm was validated with various test cases and it was seen that the performance is improved drastically with high non-linearity with the memory polynomials order of 4 and 5 and having linear output. With the incorporation of memory polynomial digital predistortion in the proposed technique, the overall performance has been showing very good results. The overall improvement in the performance is observed by the incorporation of power amplifier with high non-linearity and thereby achieving less distortion with linear output.