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Cross-Layer Design of FDD-OFDM Systems Based on ACK/NAK Feedbacks

机译：基于ACK / NAK反馈的FDD-OFDM系统跨层设计

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摘要

It is well known that cross-layer scheduling which adapts power, rate and user allocation can achieve significant gain on system capacity. However, conventional cross-layer designs all require channel state information at the base station (CSIT) which is difficult to obtain in practice. In this paper, we focus on cross-layer resource optimization based on ACK/NAK feedback flows in orthogonal frequency-division multiplexing (OFDM) systems without explicit CSIT. While the problem can be modeled as Markov decision process (MDP), brute-force approach by policy iteration or value iteration cannot lead to any viable solution. Thus, we derive a simple closed-form solution for the MDP cross-layer problem, which is asymptotically optimal for sufficiently small target packet error rate (PER). The proposed solution also has low complexity and is suitable for real-time implementation. It is also shown to achieve significant performance gain compared with systems that do not utilize the ACK/NAK feedbacks for cross-layer designs or cross-layer systems that utilize very unreliable CSIT for adaptation with mismatch in CSIT error statistics. Asymptotic analysis is also provided to obtain useful design insights.
机译：众所周知，适应功率，速率和用户分配的跨层调度可以显着提高系统容量。但是，常规跨层设计都需要基站（CSIT）的信道状态信息，这在实践中很难获得。在本文中，我们专注于在没有显式CSIT的正交频分复用（OFDM）系统中基于ACK / NAK反馈流的跨层资源优化。尽管可以将问题建模为马尔可夫决策过程（MDP），但通过策略迭代或值迭代的暴力方法无法得出任何可行的解决方案。因此，我们得出了MDP跨层问题的简单封闭式解决方案，对于足够小的目标分组错误率（PER），这是渐近最优的。所提出的解决方案还具有低复杂度并且适合于实时实施。与不使用ACK / NAK反馈进行跨层设计的系统或使用非常不可靠的CSIT进行自适应以适应CSIT误差统计中的失配的系统相比，它也显示出显着的性能提升。还提供了渐进分析以获得有用的设计见解。

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