Investigating of SU-MIMO Techniques for LTE- Release 8 in Highly Scattering Environment
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Date
2017-07
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Publisher
AAU
Abstract
LTE systems promise of delivering large data rate to users which is substantially
larger than what the previous third generation (3G) systems offered. However, as user
traffic grows it will put greater demands on network capacity. More importantly, in urban
environment the construction of buildings, which are taller than base station’s height,
create highly scattering environment for radio signal which leads to multipath fading.
Small antenna height has in turn negative effect on both coverage and capacity.
Multiple Input Multiple Output (MIMO) antenna systems are one of the most
efficient leading innovations to accommodate high data traffic and eliminate the effect of
multipath scattering environment. MIMO systems can turn multipath propagation,
traditionally a pitfall of wireless transmission, into a benefit for the user. It can also be
used to achieve improved system performance, including improved system capacity and
improved coverage, as well as improved service with higher per-user data rates. The
operator can achieve all these without increasing average transmit power or frequency
bandwidth.
This thesis investigates the performance evaluation of different schemes of Single
User MIMO (SU-MIMO) for the downlink of LTE. This evaluation will be based on
performance metrics such as ergodic capacity and average Bit Error Rates (BER) for
different MIMO antenna transmission schemes and their tradeoff. For this case study, the
ideal MIMO radio channel models assume a Rayleigh fading environment which is used as
a reasonable model for the effect of heavily built-up urban. It will be shown analytically
and with MATLAB simulation the impressive improvements in capacity and BER brought
about by the use of SU-MIMO techniques. Finally suggestion will be given to which
modes of MIMO to use for different kind of highly scattering environment depending upon
the speed (fast and slow moving) and location (cell-centered and cell-edge) of the user
equipment (UE). The developed techniques can be applied to fast and accurate
performance evaluation for future network planning, deployment and optimization of
LTE-MIMO systems.
Description
Keywords
SU-MIMO, LTE Release 8, OFDM, Rayleigh fading. Spatial diversity, Spatial multiplexing, Ergodic capacity, BER