In this article, we present a novel decomposed vector rotation (DVR)-based recurrent neural network behavioral model for digital predistortion (DPD) of radio frequency (RF) power amplifiers (PAs) in wideband scenarios. By representing memory terms DVR with states and redesigning the piecewise modeling, propose scheme. To ensure stable operation enhanced modeling accuracy, integrate into gated l...

In this article, we present a novel digital predistortion (DPD) system which can be updated quickly and efficiently in response to the dynamic reconfiguration of multiuser multiple-input multiple-output (MIMO) transmitters. By identifying shared properties different power amplifiers (PAs) with two feature extraction stages, nonlinear behaviors PAs are encoded into low-dimensional features. Usin...

Abstract In a digital predistortion (DPD) system, accurate loop delay estimation is one of the prerequisites for precise calculation DPD coefficient. Multiplications plural numbers are needed in most conventional algorithms. Based on Euclidean (ELDE) method, this paper proposes simplified (SELDE) method that can avoid operation multiplication numbers. The ELDE and SELDE implemented actual under...

Two simple calibration schemes for the correction of the path imbalance in a linear amplification with nonlinear components (LINC) transmitter have been demonstrated. In the foreground algorithm, a baseband digital signal processor (DSP) evaluates the gain and phase imbalance with a set of calibration signals, while in the background algorithm, the imbalance is characterized by exchanging the t...

Two closely related non-linear distortions introduced in a multicarrier modulation based wireless local area network (LAN) transmitter are clipping due to high peakto-average-power-ratio (PAR) and saturation due to nonlinear power amplifiers. Various PAR reduction and RF nonlinearity compensation schemes can be found in literature and implemented in realtime systems to tackle them. Although the...

Orthogonal Frequency Division Multiplexing (OFDM) is an effective parallel multi-carrier transmission scheme. However, this technique has one weakness of a higher transmission signal Peak to Average Power Ratio (PAPR) when the signal is transmitted. To reduce the impact of High Power Amplifier (HPA) nonlinearity on OFDM system, this paper proposes the combination of improved clipping and filter...

Digital predistortion (DPD) is a widely adopted baseband processing technique in current radio transmitters. While DPD can effectively suppress unwanted spurious spectrum emissions stemming from imperfections of analog RF and baseband electronics, it also introduces extra processing complexity and poses challenges on efficient and flexible implementations, especially for mobile cellular transmi...

This paper presents a new structure for adaptive predistortion of the memoryless, nonlinear saturation effects causedby High Power Amplifiers (HPA). Timely compensation for HPA distortions is critical for cost-effective prevention of the cliff effect during terrestrial transmission of digital broadcast television. The new structure results from a two-stage approach: The forward model is identif...