| Summary: | 碩士 === 國立中正大學 === 通訊工程研究所 === 102 === By using beamforming, the multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) system combining with an active antenna system (AAS) can increase antenna gain effectively and improve the interference rejection of other beams. In this thesis, in order to perform the interference control of each beam-channel in the same beam-group, three kinds of precoding schemes, namely, the zero forcing (ZF), the joint leakage suppression (JLS), and the block diagonalization (BD) schemes, are employed. The sum-rate performance of the proposed precoding techniques at the base-station are evaluated and compared with different size of antenna arrays. Simulation results show that the sum-rate capacity is proportional to the number of antennas at the base-station. By using the BD precoding design, a superior sum-rate performance can be achieved in downlink.
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