正交分頻多重接取系統之跨層式排程演算法; A Cross Layer Scheduling Algorithm for OFDMA Systems

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题名:	正交分頻多重接取系統之跨層式排程演算法;A Cross Layer Scheduling Algorithm for OFDMA Systems
作者:	陳世原;Shih-yuan Chen
贡献者:	通訊工程研究所
关键词:	正交分頻多重接取系統;跨層式排程演算法;資源配置;Cross Layer Scheduling Algorithm;Resource Allocation;OFDMA
日期:	2008-07-07
上传时间:	2009-09-22 11:21:35 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	在本文中，我們提出了一個應用在正交分頻多重接取系統的跨層式排程演算法。我們演算法的主要目標放在提高資料傳輸量和使用者的滿意度(Satisfaction)，正因如此每個使用者的通道狀況和平均資料傳輸需求量都需要被考慮到。另外我們使用一種考慮總傳輸功率和位元錯誤率限制下來達到最高資料傳輸量的傳輸功率配置演算法。此功率配置演算法是根據注水(Water-filling)原理來做傳輸功率配置，但並不是完全根據注水原理來配置傳輸功率，而是藉由調節注水原理階層(Water-filling level)來配置傳輸功率。最後透過模擬的結果，我們可以發現我們所提出的階層式排程演算法確實達到了我們所想要的結果。 This thesis develops a scheduling algorithm for downlink Orthogonal Frequency Division Multiple Access (OFDMA) systems. Assume that the base station knowing the channel gains of all subcarriers of all users. This algorithm aims to improve the total data rate and the number of satisfied users, and therefore each user’s channel information and the average data rate requirement are necessary to be considered. We use an algorithm for transmission power allocation that it is aiming at maximization of throughput under the constraint of total transmission power and bit error rate. The transmission power allocation algorithm is based on the water-filling approach, which is a method for maximizing throughput under the constraint of total transmission power. However, the water-filling power allocation is not used fully, instead of by varying the water-filling level wanted in the water-filling power allocation. Finally, the numerical result shows that the proposed scheduling algorithm approaches a higher total data rate and improves user satisfaction.
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