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| An Adaptive Scheme with Guaranteed QoS for Multiuser MIMO/OFDM Downlink |
| Han Feng; Liu Ying-zhuang; Zhu Guang-xi; Lu Xiao-feng |
| Dept. of Electronic and Information Engineering, Huazhong University Science & Technology, Wuhan 430074, China |
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Abstract This paper investigates adaptive resource allocation scheme to maximize the sum-rate under the QoS constraint for multiuser MIMO/OFDM downlink. Specifically, the basestation exploits spatial division multiple access (SDMA) to support several users in each subcarrier, and linear precoding to reduce inferences among users. An adaptive power and bit allocation scheme with guaranteed QoS is provided. And two low-complexity suboptimal bit fill and bit removal algorithms which could be used in practical systems are proposed. Simulation results show that these two algorithms achieve nearly the same performance as the optimal one.
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Received: 07 December 2006
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2008, Vol. 30 
