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Received: 2007-07-04

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Journal of Zhejiang University SCIENCE A 2008 Vol.9 No.2 P.215~224

10.1631/jzus.A071366


Power duality for multi-antenna OFDM system in broadcast channel with user scheduling


Author(s):  Feng SHE, Han-wen LUO, Lei CHEN, Hua XIA

Affiliation(s):  Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; more

Corresponding email(s):   shefeng630@yahoo.com.cn

Key Words:  Multiple-input multiple-output (MIMO), Orthogonal frequency division multiplexing (OFDM), Broadcast channel, Multi-user diversity, Dirty paper coding (DPC), Downlink scheduling


Feng SHE, Han-wen LUO, Lei CHEN, Hua XIA. Power duality for multi-antenna OFDM system in broadcast channel with user scheduling[J]. Journal of Zhejiang University Science A, 2008, 9(2): 215~224.

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DOI - 10.1631/jzus.A071366


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.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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