Mobile WiMAX之同步增進通道容量與能量效率之技術

• Main Authors: Liu, Bao-Yuan, 劉寶元
• Other Authors: Chang, Shih-Yu
• Format: Others
• Language: en_US
• Online Access: http://ndltd.ncl.edu.tw/handle/97222878121050278853

碩士 === 國立清華大學 === 通訊工程研究所 === 97 === The latest mobile WiMAX standard promises to enable low-cost mobile Internet applications over extensive areas and to meet the capacity requirements. More specifically, mobile WiMAX combines advanced MIMO schemes and relay transmission technique along with flexible bandwidth and fast link adaptation. In this paper, we propose the weighting filter to increase capacity and conserve power-consumption by deployment strategy simultaneously in anticipation of growing customer demands. Indeed, the channel capacity for two well known relaying schemes are investigated: analogue (amplify and forward) relaying and digital (decode and forward) relaying from a mobile device to the base station through a relay node. In order to further increase the channel capacity, we propose two efficient weight functions (Matched filter and Minimum Mean Square Error (MMSE) filter) adopted by relay node according to the wireless channel condition. In addition, a new power saving scheme by introducing the problem for relay stations (RSs) deployment and adopt the Branch-and-Bound (BB) algorithm to solve this problem is also presented. Furthermore, our numerical results demonstrate the significant improvement of network capacity by applying the matched filter weight at relay nodes and verify the effectiveness for the proposed BB algorithm. Finally, the significant performance gain can be achieved when RSs are strategically installed in the network.