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

*(English)*Zbl 1140.94317Summary: 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.

##### MSC:

94A40 | Channel models (including quantum) in information and communication theory |

90B22 | Queues and service in operations research |

##### Keywords:

multiple-input multiple-output (MIMO); orthogonal frequency division multiplexing (OFDM); broadcast channel; multi-user diversity; dirty paper coding (DPC); downlink scheduling
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\textit{F. She} et al., J. Zhejiang Univ., Sci. A 9, No. 2, 215--224 (2008; Zbl 1140.94317)

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