Applying Direction Finding Algorithms in the OFDM Smart Antenna System

• Main Authors: Kuo-wei Ho, 何國維
• Other Authors: 林信標
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/70790341292873057126

碩士 === 國立臺北科技大學 === 電腦通訊與控制研究所 === 91 === A smart antenna system combines an antenna array and a digital signal processing to track the mobile location automatically. That can dramatically increase the performance characteristics in a wireless communication system. We use the adaptive direction-of-arrival (DOA) algorithm, MUSIC, to archive the tracking location goal. But the DOA algorithm is proposed in a narrowband system. In a wideband system, the wideband frequency-selective fading will diminish the DOA performance. In order to overcome this problem, we introduce the OFDM（Orthogonal Frequency Division Multiplex） architecture to combat the wideband frequency-selective fading. In other words, the OFDM system can transferred a wideband frequency-selective fading into a combination of several narrowband flat fading channels. Thus, the DOA algorithm that proposed for the narrowband environment, like the MUSIC algorithm, can be applied to each narrowband system.