Research on Resource Allocation for Multicast Services in OFDM ystems

• Main Authors: Chieh-Ching Su, 蘇介清
• Other Authors: Jyh-Horng Wen
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/82855650030442354198

碩士 === 東海大學 === 電機工程學系 === 97 === Recently, there has extensive research on resource allocation schemes for multicast services that would satisfy the requirements of multimedia traffic. Dynamic resource allocation is a key techniques that can significantly improve the performance of the next generation wireless systems under guaranteed QoS to user. Most of the current resource allocation algorithms are, however, limited to unicast traffics. In this thesis, we considered separately the different optimal scheme to promote the system throughput in the multicast OFDM systems. First, we considered the scheme of maximum throughput (MT) under the constraint of total power. Next, that considered another optimal scheme for MT under the constraint of total power and proportional fairness (PF). To solve the optimal problem, we can utilize the integer programming (IP) to obtain the optimal solution. However, which used the IP to solve, often had high computational complexity. Therefore, we proposed the suboptimal algorithm that has the low-complexity. First, the algorithm that assigned the sub-channels to the groups by all groups of the users of the channel information. Then, each sub-channel assigned power to promote the system throughput. Numerical results show that the proposed resource allocation scheme for both MT and PF significantly outperform the conventional multicast transmission scheme. The difference optimum and heuristic solutions is less than 5%.