Habib, Usman (2018) Millimetre-wave radio-over-fibre supported multi-antenna and multi-user transmission. Doctor of Philosophy (PhD) thesis, University of Kent,. (KAR id:71556)
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Abstract
In this thesis, various features of the RoF supported mmW communication for
future wireless systems have been analysed including photonic generation of mmW
for MIMO operation, performance analysis of mmW MIMO to achieve spatial
diversity and spatial multiplexing with analog RoF fronthaul, and multi-user
transmission in the 60 GHz-band using multiplexing-over-fibre transport and
frequency-selective antenna.
A low cost mmW generation system for two independent MIMO signals has been
presented, consisting of a single optical Phase Modulator (PM). The different
aspects of experimental analysis on RoF-supported mmW MIMO in this thesis,
which were not considered before, include use of specific MIMO algorithm to
understand the amount of improvement in coverage and data rate for a particular
MIMO technique, performance comparison with SISO at several user locations, and
verification of optimum RAU physical spacing for a particular transmission
distance with the theoretical results. The results show that flexible and wider RAU
spacings, required to obtain optimum performance in a mmW MIMO system, can
be achieved using the proposed analog RoF fronthaul. The investigation was
extended to verification of a method to individual measurement of mmW channel
coefficients and performing MIMO processing, which shows that mmW channels
are relatively static and analysis can be extended to much longer distances and
making projections for N×N MIMO.
For mmW multi-user transmission, a novel low cost, low complexity system using
single RoF link and single RF chain with single transmitting antenna has been
presented and characterized, which was based on large number of RF chains and
multiple antenna units previously. The setup involves generation and RoF transport
of a composite SCM signal, upconversion at the RAU and transmission of different
frequency channels towards spatially distributed users using a frequency-selective
Leaky-Wave-Antenna (LWA), to convert Frequency Division Multiplexing (FDM)
in to Spatial Division Multiple Access (SDMA). Analysis on low user-signal
spacing for the SCM shows the feasibility to serve a large number of users within a
specific transmission bandwidth and experimental demonstration to achieve sum
rate of 10Gb/s is shown by serving 20 users simultaneously. Furthermore, investigation on SNR degradation of high bandwidth signals due to beamsteering
effect of the LWA and theoretical calculations of the sum data rate for different
number of users is performed, which shows that the proposed system can provide
much higher sum rates with high available SNR. It was also experimentally
demonstrated that improvement in coverage and spectral efficiency is obtained by
operating multiple LWAs using single RF chain. Finally, an experimental
demonstration of a DWDM-RoF based 60 GHz multi-user transmission using
single LWA is presented to show the feasibility to extend the setup for a multiple
RAU based system, serving each at distinct optical wavelength and performing
direct photonic upconversion at the RAU for low cost mmW generation.
Item Type: | Thesis (Doctor of Philosophy (PhD)) |
---|---|
Thesis advisor: | Gomes, Nathan |
Thesis advisor: | Wang, Chao |
Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
Divisions: | Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts |
Funders: | Organisations -1 not found. |
SWORD Depositor: | System Moodle |
Depositing User: | System Moodle |
Date Deposited: | 07 Jan 2019 10:10 UTC |
Last Modified: | 05 Nov 2024 12:34 UTC |
Resource URI: | https://kar.kent.ac.uk/id/eprint/71556 (The current URI for this page, for reference purposes) |
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