Location-based Interference Mitigation and Spatial Grouping Techniques for Hetnet

• Main Authors: Li-Chiao Hung, 洪莉喬
• Other Authors: Yung-Fang Chen
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/62172512377692324861

碩士 === 國立中央大學 === 通訊工程學系 === 101 === In this thesis, we proposed an angle of arrival (AOA) based beamforming structure for orthogonal frequency division multiple access (OFDMA)-based Hetnet systems. The proposed scheme has interference resistant capability without the needs in the estimation of the channel parameters and the calculation of beamforming weight vector for each subcarrier in OFDM-based systems. It can also reduce extra burden and delay generated from communication link between the femtocell and the central entity for using beamforming technology. Then, one can also use the obtained AOAs at receivers to group users to reduce the co-channel interference (CCI) among users. The grouping concept appears in [1] which requires a multi-user detection device at the receiver and ignores the influence of multipaths. However, the multi-user detection device may not exist in the receiver and some multipath might cause serious interference effect. In this thesis, another grouping idea is proposed to aim at minimizing the CCI by considering the multipath impact and without multiuser detection device. The simulation results are presented to demonstrate the efficacy of the proposed algorithms.