We analyze out-of-band (OOB) emissions in the massive multi-user (MU) multiple-input multiple-output (MIMO) downlink. We focus on systems in which the base station (BS) is equipped with low-resolution digital-to-analog converters (DACs) and orthogonal frequency-division multiplexing (OFDM) is used to communicate to the user equipments (UEs) over frequencyselective channels. We demonstrate that ...

Digital predistortion (DPD) of a phased array requires that multiple transmit paths must be measured by feedback (FB) receiver (Rx). In this article, we propose an FB concept for DPD in time-division-duplex (TDD) arrays. We use single line to collect the waveform samples from parallel Rx. The TDD switches are used enable and disable individual paths. is calibrated comparing outputs power amplif...

Several researchers have demonstrated how neural networks can be trained to compensate for nonlinear signal distortion in e.g. digital satellite communications systems. These networks, however, require that both the original signal and its distorted version are known. Therefore, they have to be trained oo-line, and they cannot adapt to changing channel characteristics. In this paper, a novel du...

Efficient RF power amplifiers used in third generation systems require linearization in order to reduce adjacent channel inter-modulation distortion, without sacrificing efficiency. Digital baseband predistortion is a highly cost-effective way to linearize power amplifiers (PAs). New communications services have created a demand for highly linear high power amplifiers (HPA's). Traveling Wave Tu...

DPD (also known as dihydrouracil dehydrogenase, dihydrothymine dehydrogenase, and uracil reductase; EC 1.3.1.2) is the initial enzyme and the rate-limiting step in the pyrimidine catabolic pathway (1). Studies over the past two decades have demonstrated that DPD is an important regulatory enzyme in the metabolism of both the naturally occurring pyrimidines uracil and thymine as well as the canc...

Current wireless c o m m u n i c a t i o n standards have been established to carry voice, data and video with high data rates. These high data rates require efficient modulation techniques such as OFDM 64 QAM, to allow transmission in a given finite bandwidth. With these types of modulation, there are probabilities that at certain times, the voltages of the multiple carriers are in phase and t...

Dihydropyrimidine dehydrogenase (DPD) deficiency is an autosomal recessive disease characterized by thymine-uraciluria in homozygous deficient patients. Cancer patients with a partial deficiency of DPD are at risk of developing severe life-threatening toxicities after the administration of 5-fluorouracil. Thus, identification of novel disease-causing mutations is of the utmost importance to all...

SUMMARY DNA polymorphism detector (DPD) is a new web application developed to help automate the process of cDNA clone validation. DPD identifies and highlights discrepancies between any cDNA clone sequence and its expected reference sequence. To determine if these differences correspond to natural genetic polymorphisms (versus artifacts introduced during clone production or evaluation), DPD use...

Orthogonal Frequency Division Multiplexing (OFDM) is vulnerable with respect to nonlinear distortions caused, for example, by a nonlinear high power amplifier. In the presence of nonlinear high power amplification, OFDM suffers from crosstalk between all subcarriers. Furthermore, the power density spectrum is significantly widened. In this paper, we simultaneously use a memoryless predistorter ...