|Title||Spectrum regrowth reduction in power amplifiers using digital baseband signal injection|
|Authors||Bondar, D., Budimir, D. and Shelkovnikov, A.B.|
This paper addresses the issue of improving distortion compensation in a memoryless digital predistorter. It presents a developed iterative baseband injecting method aimed at overcoming the distortion compensation limit. The concept of the proposed technique is described in the following section. Further section presents experimental verification of the considered PA modelling technique and results of Matlab-ADS co-simulations for demonstrating performances of the proposed predistortion approach. The spectrum regrowth improvement of 32 dB is achieved. The variation of the simulated error vector magnitude (EVM) at the output of the power amplifier with and without DPD is presented. The simulated results of 8 MHz offset Adjacent channel power ratio (ACPR) are ilustrated for upper and lower adjacent channels.
|Keywords||Digital predistortion, baseband injection, linearization|
|Conference||Asia-Pacific Microwave Conference 2008 (APMC'08)|