Spectrally efficient linear modulation techniques are used in the third generation systems and their performance is strongly dependent on the linearity of the transmission system, Also, the efficiency of the amplifier to be used has to be maximized, which means that it must work near saturation. Newer transmission formats, with wide bandwidths, such as multi carrier wideband code division multi...

This paper describes the use of the MATLAB in the laboratory experiments in our Signal Processing Laboratory. One of the most important applications that we are currently working on is the algorithms verification for the linearization of power amplifiers using digital baseband adaptive predistortion. In order to test the operation of the predistorter on digitally modulated signals, the experime...

In this article, an auxiliary module is proposed to mitigate the crosstalk effect in multiple input–multiple output (MIMO) transmitters. Other branches do not need considering when linearizing local branch, which reduces complexity of module, and some can be linearized selectively make application more flexible. end, feasibility algorithm verified through experimental platform. Experimental res...

The baseband digital pre-distortion (DPD) signal processing technique is the most cost-effective linearisation method among other techniques to address nonlinearity effect of power amplifier. For communication systems containing DPD and amplifier, it difficult acquire performance metrics closed-forms for any architecture since there was no mathematical expression each coefficient. Usually, rese...

In wireless communication systems, high-power transmitters suffer from nonlinearities due to power amplifier (PA) characteristics, I/Q imbalance, and local oscillator (LO) leakage. Digital Predistortion (DPD) is an effective technique to counteract these impairments. To help maximize agility in cognitive radio systems, it is important to investigate dynamically reconfigurable DPD systems that a...

This paper examines different linearization techniques which are used to linearize the power amplifier by emphasizing on weakness and strength of each technique. After complete analyze it has been concluded that Digital Pre Distortion (DPD) technique is the best linearization technique to linearize the power amplifier. DPD technique for linearizing a wideband radio frequency power amplifier has...

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...

For wideband or high power applications, the power amplifier exhibits memory effects, for which memory less predistorters can achieve only limited linearization performance. The memory polynomial predistorter can correct both the nonlinear distortions and the linear frequency response that may exist in the power amplifier. It is a robust predistorter, which has demonstrated good performance on ...

Remembrance of recent events is a major problem for individuals with dementia. Consequently, this article explores the process of acceptance and integration of a digital photograph diary (DPD) as a tool for remembrance of and conversations about daily life events. A design for multiple case studies was used. Seven couples, in which one individual in the couple had Alzheimer's disease, tested th...