In this article, a novel digital predistortion (DPD) solution for fully multiple-input–multiple-output (MIMO) transmitters (TXs) is proposed. Opposed to classical DPD solutions that operate at TX chain or antenna level, the proposed operates stream beam and hence, its complexity proportional number of spatially multiplexed streams users rather than antennas. addition, beam-level in frequency do...

White light emitting diodes (LEDs) have been widely utilized for illumination owing to their desired properties of inherent bright output, high efficiency, low power consumption and long life-time. They are also increasingly applied in optical wireless communications for realizing high data rate transmission. This paper presents an improved scheme relying on the insertion of a simple predistort...

As the demand for high speed and reliable wireless communication increases, the importance of having a linear transmitter has enhanced. Distortions created by the transmitter, such as power amplifier nonlinearity and I/Q imbalance, diminish the fidelity and limit the performance of wireless systems, if left undealt with. Among the techniques commonly used to mitigate these distortions, digital ...

Digital compensation of nonlinear distortion due to nonlinear characteristic of electronic or electromechanical device is becoming more and more important. This paper considers Direct Learning Architectures (DLAs) for predistortion of nonlinear systems described using Volterra series. The adaptive predistorter which is connected in tandem with the nonlinear system can be modeled as a Volterra f...

Since division is not a standard operation for DSP processors and because it can be implemented in several different ways, there is no specific algorithm clearly to choose. It all depends on the requirements, such as accuracy, size and speed. A few suitable algorithms should be selected and implemented in VHDL for evaluation. The implementation is expected to be a part of an existing baseband p...

A digital look-up table adaptive predistortion technique using a six-port receiver for power amplifier linearization is presented. The system is designed in Ka-band for a DVB-S2 satellite link. We use a six-port receiver at the linearizationloop in place of classic heterodyne receivers. The six-port receiver is implemented by the use of passive microwavecircuits and detector diodes. This approa...