多輸入多輸出正交分頻多工系統下之多使用者資源分配演算法設計

Algorithm Designs of Resource Allocation for Multiuser MIMO OFDM Systems

廖克軒(Ker-Hsuan Liao)

指導教授 ： 陳永芳

國立中央大學/資訊電機學院/通訊工程學系/碩士(2008年)

摘要

在本文中，我們提出了兩個在多輸入多輸出正交分頻多工系統於向上鏈結下之資源分配的方案，並與現有之演算法相比較。兩個方案均以在滿足資料傳輸率和位元錯誤率之限制下，降低總體使用者的傳輸功率為目的。第一個方案裡，應用了一個反複式多使用者位元配置的方法。我們的方案藉由觀察這個方法的解，決定每個子載波是否可以被共用。模擬結果呈現出我門的方案比全部頻率不共用的方案需要比較少的總體使用者功率，而確保各使用者傳輸率和位元錯誤率的品質。第二個方案利用了一個相關性分群方法到一個多輸入多輸出正交分頻多工系統下的迫零接收機的封閉型態之位元配置演算法。模擬結果顯示，這個方案不只有有較低的計算複雜度而且比一個第三章提到的反覆式鄰近搜尋演算法需要更少的功率。

關鍵字

資源分配 ； 正交分頻多工

並列摘要

In this thesis, we provide two resource allocation schemes in multiple-input multiple-output (MIMO)/orthogonal frequency-division multiplexing (OFDM) systems on uplink and compare them with present algorithm. Both schemes aim at minimizing the total user transmit power while satisfying required data rate and bit error rate. A resource allocation scheme based on a iterative multi-user bit allocation method is applied in the first one. This scheme determines whether each sub-carrier is reusable for users by observing the method’s solution. Simulation results show that the proposed scheme needs lower total user power consumption than the frequency-separated scheme while quality of each user’s data rate and bit error rate is guaranteed. In the second, we utilize the correlation-grouping scheme to a closed form bit allocation algorithm of zero-forcing detector for MIMO/OFDM systems. Simulation results show that this scheme not only has a lower computation complexity but also a better performance than the Iterative Descending Neighborhood Searching algorithm illustrated in chapter 3.

並列關鍵字

Resource Allocation ； OFDM

參考文獻

[1] Y. J. Zhang and K. B. Letaief, “An efficient resource-allocation scheme for spatial multiuser access in MIMO/OFDM systems,” IEEE Trans. Commun., vol. 53, no. 1, pp.107 – 116, Jan. 2005.

[2] Y. J. Zhang and K. B. Letaief, “Adaptive resource allocation for multiaccess MIMO/OFDM systems with matched filtering,” IEEE Trans. Commun., vol. 53, no. 11, pp.1810 – 1816, Nov. 2005

[3] L.Y. Oh and Y. F. Chen, “An iterative multi-user bit and power allocation algorithm for DMT-based systems,” IEICE Trans. Commun., vol. 88, no.11, pp.4259–4265 Nov. 2005.

[4] P. Uthansakul and M. E. Bialkowski, ”An Efficient Adaptive Power and Bit Allocation Algorithm for MIMO OFDM System Operating in a Multi User Environment,” in Proc. IEEE VTC, vol. 1, 2006, pp. 1531-1535.

[6] C. Y. Wong, R. S. Cheng, K. B. Lataief, and R. D. Murch, “Multiuser OFDM with adaptive sub-carrier, bit, and power allocation,” IEEE J. Sel. Areas Commun., vol. 17, no.10, Oct. 1999, pp.1747 – 1758