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Opportunistic Multiuser Beamforming for Wireless Networks: (MSc Project)
Design of Compact Wide Band 2x2 MIMO Antenna System for LTE hand held terminals:
I recently designed a novel four-element 2 x 2 compact wide-band MIMO antenna system that covers a frequency range of 1450-2450 MHz. Hence, achieving a bandwidth of 1 GHz at <-7dB. The proposed antenna system can be utilized for most of the LTE bands. The antenna system accomplishes the LTE standard value of envelope correlation coefficient ρ of < 0.3 and is able to provide the diversity gain. Isolation between antenna elements of higher than 7.5 dB is achieved. The overall size of the antenna is 58 x 60 x 1.6 mm3. Due to the Compactness and wide band the proposed antenna is suitable to be integrated in mobile handheld terminals. This work is accepted at an IEEE Conference (15th STEM 2012), and I have started writing the journal paper with more analysis and measured results.
It is highly desirable in wireless communication not to serve a user when the state of its channel is in deep fade. This increases the probability for a user unable to access the network forever being in faded state. However, this problem can be alleviated considerably by introducing sufficient fluctuations of the channels among users. To this end, recently, an approach called opportunistic beam-forming is proposed to employ multiple transmit antennas to intentionally introduce “more” channel fluctuations to users so that they can have more or less the same opportunity on average to access the channel. The aim of this project was to study the potential of opportunistic beam-forming technique and investigate how it can be used in combination of conventional frequency planning.
Furthermore, Microwave Circuits I designed so far are as follow:
1. Matching circuit using Single open circuit stub
2. Matching Circuit using Single Quarter Wave Transformer 'QWT'
3. Matching Circuit using two section QWT
4. Wilkinson Power splitter/ equivalent circuit
5. Pi type Low pass filter using lumped components
6. T type Low pass filter using Lumped components
7. Low pass filter using Microstrip lines
8. Transistor based RF & Microwave Amplifier centered at 2.45 GHz
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