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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2008, Vol. 9 Issue (2): 215-224    DOI: 10.1631/jzus.A071366
Electrical & Electronic Engineering     
Power duality for multi-antenna OFDM system in broadcast channel with user scheduling
Feng SHE, Han-wen LUO, Lei CHEN, Hua XIA
Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Datang Microelectronics Technology Co., Ltd., Beijing 100083, China
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Abstract  This paper deals with design and analysis of user scheduling and power allocation for multi-antenna OFDM systems with DPC, ZF-DPC, ZF-BF and TDMA transmit strategies. We consider the general multi-user downlink scheduling problem and power minimization with multi-user rate constraints. According to the channel state, it is shown that there is a power optimal policy which selects a subset of users in each scheduling interval. We present user selection algorithms for DPC, ZF-DPC, ZF-BF and TDMA for multi-antenna OFDM system in broadcast channels, and we also present the practical water-filling solution in this paper. By the selected users with the consideration of fairness, we derive the power optimization algorithm with multi-user rate constraints. We also analyze the power duality of uplink-downlink for the transmit strategies of DPC, ZF-DPC and ZF-BF. Simulation results show that the present user-scheduling algorithm and power minimization algorithm can achieve good power performance, and that the scheduling algorithm can guarantee fairness.

Key words： Multiple-input multiple-output (MIMO)      Orthogonal frequency division multiplexing (OFDM)      Broadcast channel      Multi-user diversity      Dirty paper coding (DPC)      Downlink scheduling     
Received: 04 July 2007     
CLC:  TN929.5  
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Feng SHE
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Hua XIA
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Feng SHE, Han-wen LUO, Lei CHEN, Hua XIA. Power duality for multi-antenna OFDM system in broadcast channel with user scheduling. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2008, 9(2): 215-224.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A071366     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2008/V9/I2/215

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