Hybrid Precoding in Millimeter Wave MIMO Systems

• Main Authors: LAI,YEN-TING, 賴彥廷
• Other Authors: CHIU, MAO-CHING
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/m6d7j7

碩士 === 國立中正大學 === 通訊工程研究所 === 106 === Ever changing mobile communication technology is coming, 4G(4th Generation) mobile communication system has been used widely around the world. We are in the age of high-tech which things change rapidly. The spectrum has become a valuable resource in wireless communication system. Development of 5G(5th Generation) mobile communication system is a popular issue around the world in recent years. Therefore, how to enhance higher data throughput and more stable system in limited spectrum resource is the key of 5G mobile communication system. Millimeter wave (mmWave) communication allows us to take advantage of new spectrum bands between 30 GHz and 300 GHz to meet the ever-increasing capacity requirements of fifth-generation (5G) wireless communication systems. In traditional microwave frequency MIMO systems, beamforming is called precoding, but at millimeter-wave frequencies, the higher cost and power consumption of system components means that the system cannot implement one radio frequency (RF) chain for each antenna. In order to achieve spatial multiplexing, a hybrid precoder that uses fewer RF chains than an antenna emerges as a cost-effective and energy-efficient option for the transceiver architecture of millimeter-wave MIMO systems. Orthogonal matching pursuit algorithm (OMP) is a common hybrid precoding algorithm. The algorithm assumes that channel’s angle of departure is known at the transmission side, but in fact we do not know the actual transmission angle of the channel, so we propose a codebook based on the design of hybrid precoding, which is very close to the optimal OMP algorithm.