Design and Analysis for Relay-based Wireless Cooperative Communication Systems with HARQ and AMC

• Main Authors: Kai-Wen Cheng, 鄭凱文
• Other Authors: Hsuan-Jung Su
• Format: Others
• Language: en_US
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/24240373611713579598

碩士 === 國立臺灣大學 === 電信工程學研究所 === 96 === Reliable transmission is necessary in recent high-speed wireless communication systems. To overcome the fading channel, we may employ some diversity techniques. The use of multiple-input multiple-output (MIMO) technique is a well-known solution because it has an advantage in space diversity. However, due to hardware limitations, multiple antennas are hard to implemented in mobile devices. Fortunately, the use of cooperative transmission can generate a virtual MIMO system and achieve the space diversity. Besides, in order to obtain another diversity gain, we may utilize the hybrid automatic-repeat-request (HARQ) technique to obtain the time diversity gain via the retransmissions in different time slots. Furthermore, to maximize the system throughput, we may introduce the adaptive modulation and coding (AMC) technique to adapt to the fading channel. In this thesis, we designed a relay-based cooperative communication system with HARQ and AMC to combine the above benefits for reliable high-speed wireless transmission. To get more practical results, we tested our systems based on the high speed downlink packet access (HSDPA) system.