適應性區塊資源配置演算法應用在正交分頻多工下鏈系統

Adaptive Block Resource Allocation Algorithms in OFDMA Downlink Systems

胡恆鳴(Heng-Ming Hu)

指導教授 ： 呂振森

國立臺北科技大學/電資學院/電機工程系研究所/碩士(2013年)

https://doi.org/10.6841/NTUT.2013.00176

摘要

本論文主要是探討正交分頻多工下鏈系統下適應性資源配置演算法。傳統適應性資源配置演算法以子載波為其配置單位，但近年使用的OFDMA系統如WiMAX及LTE等系統，為了有效降低複雜度，將所有子載波劃分為數個區塊，以區塊為最小配置單位。故本論文將原先傳統比例速率限制適應性資源配置演算法，如Shen演算法、Wong演算法及Huang演算法加以修改，改以區塊來做適應性資源配置。在夏農傳輸容量上，三種區塊配置演算均較單純區塊配置演算法為優，尤其Huang區塊配置演算法表現最佳。在適應性調變傳輸容量上，除搭配了擁有錯誤更正能力的BCH編碼，在功率配置時，使用注水理論為基礎，結合多餘的功率有效配置。此法相較於Shen區塊配置、Wong區塊配置、Huang區塊配置和單純區塊配置的演算法，能進一步提升其高整體的傳輸容量

關鍵字

正交分頻多工系統 ； 適應性資源配置 ； 比例速率限制 ； 區塊配置 ； 功率配置

並列摘要

This thesis mainly researches into the adaptive block resource allocation algorithms in OFDMA downlink systems. Traditional adaptive resource allocation algorithms use the subcarrier as the basic resource allocation unit. But the recent OFDMA systems such as WiMAX and LTE divide subcarriers into several blocks and use the block as the basic resource allocation unit to reduce the system’s complexity. Therefore, this thesis aims to modify traditional proportional rate constraint adaptive resource allocation algorithms such as Shen’s, Wong’s, and Huang’s algorithm into adaptive block resource allocation algorithms. For Shannon capacity, these three block allocation algorithms are better than algorithm with only blocks assigned. Especially, Huang’s algorithm is the best. For adaptive modulation, we propose an algorithm using both BCH codes with error correct ability and power allocation based on water-filling algorithm with excess-power reallocation. The capacity of our proposed algorithm is better than those of all other algorithms based on block.

並列關鍵字

OFDMA downlink system ； adaptive resource allocation ； proportional rate constraint ； blocks allocation ； power allocation

參考文獻

[1] Alex Leith, Mohamed-Slim Alouini, Dong In Kim, Xuemin Shen and Zhiqiang, "Flexible Proportional-Rate Scheduling for OFDMA System," IEEE Transactions on Mobile Computing, pp. 1-14, Jul. 2012.

[3] Z. Shen, J. G. Andrews and B. L. Evens, "Adaptive resource allocation in multiuser OFDM systems with proportional rate constraints," IEEE Transactions on Wireless Communication, vol. 4, no. 6, pp. 2726-2737, Nov. 2005.

[4] I. C. Wong, Z. Shen, J. G. Andrews and B. L. Evens, "A low complexity algorithm for proportional resource allocation in OFDMA systems," IEEE Signal Processing Systems, pp. 1-6, Oct. 2004.

[6] Michere Morelli, C.-C Jay Kuo and Man-on Pun, "Synchronization Technique for Orthogonal Frequency Division Multiple Access (OFDMA): A Tutorial Review", Proceedings of the IEEE, vol. 95, no. 7, pp.1394-1425, Jul. 2007.

[7] S. Haykin, Communication Systems, Fourth Edition, Wiley, pp.23-24, 2001.