Essays about: "IQ-modulator"

Found 3 essays containing the word IQ-modulator.

1. 1. Performance evaluation of IQ-modulator ADL5375at 5.8 GHz and its effect on transmitterperformance in a telecommunications system

   University essay from Uppsala universitet/Fasta tillståndets elektronik

   Author : Alexander Bergslilja; [2015]
   Keywords : IQ-modulator; Radio; LTE; 5.8 GHz;

   Abstract : Because of the tough competition inthe telecom business there is aconstant push for higher capacity anddata rates and the companies producingthe telecommunications equipment needmore cost effective products to stayahead of competitors. It is thereforeinteresting to evaluate thepossibilities to use unlicensedfrequency bands at higher frequenciesas a complement to the traditionallower frequency bands. READ MORE

3. 2. Low-Power Low-Noise IQ Modulator Designs in 90nm CMOS for GSM/EDGE/WCDMA/LTE

   University essay from Institutionen för systemteknik

   Author : Mattias Johansson; Jonas Ehrs; [2010]
   Keywords : RF; ASIC; Analog Integrated Circuit; IQ Modulator; IQM; CMOS; 90nm; Predistortion; Mixer; Envelope Tracking; Direct Conversion;

   Abstract : The current consumption of the IQ modulator is a significant part of the totalcurrent consumption of a mobile transmitter platform and reducing it is of greatinterest. Also, as the WCDMA/LTE standards specifies full duplex transmissionsand Tx and Rx are most often using the same antenna, it is crucial to have asolution with low noise generation. READ MORE

4. 3. Dynamic nonlinear pre-distortion of signal generators for improved dynamic range

   University essay from Institutionen för teknik och byggd miljö

   Author : Suzan Jawdat; [2009]
   Keywords : Predistortion; IQ imbalance; Predistortion mirror distortion; Power amplifier deficiencies; Parsimonious predistorter structures; Predistorter properties; Training of the predistorter based on N-sequences of data.;

   Abstract : In this thesis, a parsimoniously parameterized digital predistorter is derived for linearization of the IQ modulation mismatch and the amplifier imperfection in the signal generator [1]. It is shown that the resulting predistorter is linear in its parameters, and thus they may be estimated by the method of least-squares. READ MORE