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Multi-user MIMO systems with Imperfect CSIT and ARQ
Multi-user MIMO systems with Imperfect CSIT and ARQ
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机译：CSIT和ARQ不完美的多用户MIMO系统
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摘要
A robust closed-loop cross-layer design provides for the downlink multi-user multi-antenna systems with imperfect Channel State Information at the transmitter (CSIT) for slow fading channels. Using ACK/NAK feedbacks from mobiles, a closed-loop cross-layer scheduler does not require any knowledge of the CSIT error statistics. To take into account of the potential packet outage (due to imperfect CSIT), we define system goodput, which measures the average bits per second per Hertz (b/s/Hz) successfully delivered to the mobiles, as the optimization objectives. We formulate the cross-layer design as a mixed combinatorial search and Markov decision problem. Based on dynamic programming approach, the optimal power and rate allocation is determined using backward recursion and forward recursion algorithms. Simulations illustrate that the proposed closed-loop cross-layer scheduler has very robust goodput performance at moderate to high CSIT errors and pedestrian mobility.
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机译：健壮的闭环跨层设计为下行链路多用户多天线系统提供了在发射机（CSIT）上具有不完善的信道状态信息的慢衰落信道。使用来自移动站的ACK / NAK反馈，闭环跨层调度程序不需要任何CSIT错误统计信息。考虑到潜在的数据包中断（由于CSIT不完善），我们定义了系统吞吐量，该度量将成功交付给移动台的每秒平均每秒赫兹（b / s / Hz）的平均比特数作为优化目标。我们将跨层设计公式化为混合组合搜索和马尔可夫决策问题。基于动态规划方法，使用后向递归和前向递归算法确定最佳功率和速率分配。仿真表明，所提出的闭环跨层调度器在中度到高CSIT错误和行人移动性方面具有非常强大的吞吐量性能。
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