Digital Beamforming in Multipath Channel Environment for Wireless Communication

• Main Authors: Bing-Lung Liu, 劉炳龍
• Other Authors: Jeng-Kuang Hwang
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/61670522564050939979

碩士 === 元智大學 === 電機工程研究所 === 89 === Beamforming is a method of spatial filtering, which can eliminate unwanted spatial interferences and receive desired signal accurately. Nowaday, digital beamfoming method is widely used in many areas, like radar, sensor, and space exploration. In next generation of mobile communication system, it will be a key method for signal processing. In wireless communication system, the process of signal propagation results in multipath propagation. We usually describe this kind of channel as so called delay spread, doppler spread, and incident angles of multipath signal, so called angle spread. In this paper, we will discuss the effect of delay and angle spread of multipath signal, and performance of beamforming. And we will also discuss the situation of CCI and static state channel, and discriminate the narrowband and wideband signals from the relative size between delay spread and symbol period. From the above two situations, we use several narrowband and wideband digital beamformer, and algorithms, like LMS, RLS, MMSE,..etc, to research different aspects of beamforming performance in different multipath environments, and confirm the result by computer simulations.