Hybrid Beamforming Design for Partially Connected mmWave Systems under Sub-System SVD

• Main Authors: Cheng, Chung-Yen, 鄭仲言
• Other Authors: Chao, Chi-chao
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/3kkhyj

碩士 === 國立清華大學 === 通訊工程研究所 === 106 === Although hybrid beamforming is considered efficient for use in millimeter-wave (mmWave) multiple-input–multiple-output (MIMO) systems, it introduces a trade-off between achievable spectral efficiency and power consumption. Beamforming structures can be fully or partially connected. Partially connected structures use a low number of phase shifters and thus serve as an energy-efficient solution for hybrid precoding, even though performance degradation could be introduced. Most previous studies on partially connected structures have focused only on transmitter designs, and previous precoder designs include iterative calculation, leading to high computational complexity. In this thesis, we consider a new partially connected architecture for hybrid beamforming, where the antennas of the transmitter and receiver are separated into several sub-arrays, each of which is connected to a radio frequency chain group. A low-complexity algorithm based on sub-system singular value decomposition (SVD) is developed for determining the solution for multicarrier systems. The solution is then extended to a dynamic antenna array structure for better performance. Finally, the results are compared with those from previous studies. The channel model employed is the indoor mmWave channel model established by the IEEE 802.15.3c Task group, which includes line-of-sight and non-line-of-sight enviroments.