LTE radio interface is designed to enable higher data throughput, lower latency and radio access optimized for packet data applications. Advanced multiantenna techniques are an important segment of new radio interface and are necessary to achieve targeted performance of LTE system. This thesis will present basic characteristics of LTE multiple access scheme, as well as overview of physical layer structure, respective physical channels and signals and the preparation of physical layer for application of different multiantenna solutions. Also, important scheduling protocols, link adaptation and retransmission principles are elaborated, which are necessary for efficient functioning of LTE system. Required modifications of these protocols are specified to support multiantenna configurations. In addition to general overview of different multiantenna techniques, including: receive diversity, transmit diversity, beamforming and spatial multiplexing (MIMO), this thesis will specify in detail solutions as implemented in first LTE systems. Special emphasis will be given to description of MIMO scheme as the most advanced form of multiantenna system. Finally, through system level simulations, system performances will be compared in terms of capacity, coverage and offered quality of service for individual multiantenna techniques and different antenna configurations.