Investigating of SU-MIMO Techniques for LTE- Release 8 in Highly Scattering Environment

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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.



SU-MIMO, LTE Release 8, OFDM, Rayleigh fading. Spatial diversity, Spatial multiplexing, Ergodic capacity, BER