多用戶多輸入多輸出之正交分頻多工系統在非完美通道訊息下之資源分配演算法

在本文中，我們針對有非完美通道訊息的多使用者多輸入多輸出正交分頻多功系統下鏈方向提出了子載波、位元和功率分配演算法。我們第一步先設計2維編碼器-波束形成器的適應性多輸入多輸出正交分頻多工傳輸技術傳輸器，在2維編碼器上，主要目的要使訊號雜訊比增益最大化，並且消除同頻道間的干擾。第二步我們設計了子載波、位元和功率分配演算法，在假設基地台知道所有使用者所有子載波通道部分資訊，我們的目標要使傳送的功率最小化，同時滿足傳送訊號的錯誤率限制及每個使用者的傳輸速度限制條件的資源配置方法。設計的方法首先根據所需傳送功率分配子載波，然後以貪婪位元演算法分配位元；之後更進一步利用比較重新配置子載波的功率差異量，迭代的重新配置子載波以達到系統傳送功率最小化，在最後模擬結果，我們可以看出我們提出的演算法在傳送功率上有著比傳統演算法更高的效能。

關鍵字

正交分頻多工系統；多輸出多輸出；子載波分配；空時分組碼

並列摘要

In this paper, we develop subcarrier, bit, and power allocation schemes for multiuser MIMO OFDM-based systems with partial channel state information (CSI). The first part of this paper is the design of adaptive 2-D space-time coder-beamformer on each subcarrier of each user. The goal of the beam design is to maximize the SNR gain and to cancel CCI at transmitter. The second part develops the subcarrier, bit, and power allocation scheme. Assuming that base stations know the partial CSI of all subcarriers of all users, our objective is to minimize the overall transmit power while guaranteeing a prescribed error performance under a constraint of transmission rate of each user. Our scheme allocates subcarrier based on the required transmit power firstly and we allocate bit to users by the greedy bit allocation algorithm. Then we iteratively reassign subcarrier based on the power difference in order to reach the minimum transmit power. The proposed algorithm offers better performance with regard to transmit power than the conventional algorithm as illustrated in the simulation results.

並列關鍵字

Orthogonal frequency division multiplexing (OFDM) ； Multiple-input multiple-output (MIMO) ； subcarrier allocation ； space time block code (STBC)

參考文獻

[1] W. L. Ho and Y. C. Liang, “Optimal resource allocation for multiuser MIMO-OFDM systems with user rate constraints,” IEEE Transactions Vehicular Technology, vol. 58, no. 5, pp. 1190-1203, Mar. 2009.

[2] P. Xia, S. Zhou, and G. B. Giannakis, “Adaptive MIMO-OFDM based on partial channel state information” IEEE Transactions Signal Processing, vol. 52, No. 1, pp. 202-213, Jan. 2004.

[3] Y. I. Shin, T. S. Kang, and H. M. Kim, “An efficient resource allocation for multiuser MIMO-OFDM systems with zero-forcing beamformer,” in Proc. IEEE Int. Symp. Personal, Indoor and Mobile Radio Commun., no. 9, pp.1-5, Sept. 2007.

[4] L. Dong, G. Xu and H. Ling, “Prediction of fast fading mobile radio channels in wideband communication systems,” in Proc. IEEE Global Telecommun. Conference, vol. 6, no.11, pp. 3287-3291, Nov. 2001.

[5] G. Munasinghe, D. Jayalath, and Z. C. Karla, , “Adaptive subcarrier allocation in multiuser OFDM system using forced cost based decisions, ” in Proc. IEEE 23rd Int. Symp., Personal Indoor and Mobile Radio Communications, pp. 1336-1341, 9-12 Sept. 2012.

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多用戶多輸入多輸出之正交分頻多工系統在非完美通道訊息下之資源分配演算法

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