Results 81 to 90 of about 4,686 (214)
IEEE Photonics Journal, 2020 To overcome the frequency-dependent nonlinear characteristics of a directly modulated laser (DML) in a multi-level optical transmission, the spectrum-split digital pre-distortion (SS-DPD) is proposed and experimentally demonstrated to mitigate the ...
Gyu-Tai Lim +2 more
doaj +1 more source
On the Impact of Hardware Impairments on Massive MIMO [PDF]
, 2014 Massive multi-user (MU) multiple-input multiple-output (MIMO) systems are one possible key technology for next generation wireless communication systems. Claims have been made that massive MU-MIMO will increase both the radiated energy efficiency as well
Athley, Fredrik +8 more
core +2 more sources
Linearization of power amplifiers by baseband digital predistortion for OFDM transmitters [PDF]
, 2008 For the signals with high peak-to-average ratio (PAR), such as WiMax OFDM, power amplifiers need to operate in a compression mode. It results in a non-linear distortion of the output signal.
Bondar, D. +5 more
core +1 more source
Digital Predistortion for Power Amplifiers Using Separable Functions [PDF]
IEEE Transactions on Signal Processing, 2010 This paper is concerned with digital predistortion for linearization of RF high power amplifiers (HPAs). It has two objectives. First, we establish a theoretical framework for a generic predistorter system, and show that if a postdistorter exists, then it is also a predistorter, and therefore, the predistorter and postdistorter are equivalent.
Jiang, Hong, Wilford, Paul
openaire +2 more sources
On Out-of-Band Emissions of Quantized Precoding in Massive MU-MIMO-OFDM
, 2017 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 ...
Coldrey, Mikael +3 more
core +1 more source
Prototype Implementation of Two Efficient Low-Complexity Digital Predistortion Algorithms
EURASIP Journal on Advances in Signal Processing, 2008 Predistortion (PD) lineariser for microwave power amplifiers (PAs) is an important topic of research. With larger and larger bandwidth as it appears today in modern WiMax standards as well as in multichannel base stations for 3GPP standards, the ...
Timo I. Laakso +4 more
doaj +1 more source
, 2009 In this article, we discuss the accuracy of behavioral models in simulating the intermodulation distortion (IMD) of microwave GaN-based high-power amplifiers in the presence of strong electrothermal (ET) feedback.
Camarchia, Vittorio +6 more
core +1 more source
Communication Subsystems for Emerging Wireless Technologies [PDF]
, 2012 The paper describes a multi-disciplinary design of modern communication systems. The design starts with the analysis of a system in order to define requirements on its individual components.
Gotthans, T. +12 more
core +1 more source
Linear transmitter design for MSAT terminals [PDF]
, 1990 One of the factors that will undoubtedly influence the choice of modulation format for mobile satellites, is the availability of cheap, power-efficient, linear amplifiers for mobile terminal equipment operating in the 1.5-1.7 GHz band.
Bateman, Andrew +3 more
core +1 more source
Extending the Characterization Bandwidth of Dynamic Nonlinear Transmitters with Application to Digital Predistortion [PDF]
, 2016 This paper reports a new measurement method for wideband radiofrequency power amplifier characterization and digital predistortion. The proposed measurement procedure relaxes significantly the sampling rate requirement on the analog to digital converters
Ben Smida, Souheil +5 more
core +3 more sources