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arXiv 1503.07542cs.ITmath.IT
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增量式MIMO系统的节能自适应功率分配

Energy-Efficient Adaptive Power Allocation for Incremental MIMO Systems

Tumula V. K. Chaitanya, Tho Le-Ngoc

摘要:

我们认为,能量有效的自适应功率分配的三个增量多输入多输出(IMIMO)系统采用ARQ,混合ARQ(HARQ)与Chase合并(CC),HARQ与增量冗余(IR),以最大限度地减少其速率中断概率(或相当于丢包率)的约束下,每个数据包的平均能耗。我们首先提供的速率中断概率表达式的三个IMIMO系统,然后提出的方法将它们转换成一个易于处理的形式,并制定相应的非凸优化问题,可以解决的一个邻域点算法找到一个局部最优。为了进一步降低求解的复杂性,使用率中断概率表达式的渐近等价近似,我们近似的非凸优化问题作为一个统一的几何规划问题(GPP),我们推导出封闭形式的解决方案。说明性的结果表明,所提出的功率分配(PPA)提供了显着的增益,在节能相比,等功率分配(EPA),和简单的封闭形式的GPP解决方案可以提供更接近的性能,在较低的值的速率中断概率的确切方法,为三个IMIMO系统。

英文摘要:

We consider energy-efficient adaptive power allocation for three incremental multiple-input multiple-output (IMIMO) systems employing ARQ, hybrid ARQ (HARQ) with Chase combining (CC), and HARQ with incremental redundancy (IR), to minimize their rate-outage probability (or equivalently packet drop rate) under a constraint on average energy consumption per data packet. We first provide the rate-outage probability expressions for the three IMIMO systems, and then propose methods to convert them into a tractable form and formulate the corresponding non-convex optimization problems that can be solved by an interior-point algorithm for finding a local optimum. To further reduce the solution complexity, using an asymptotically equivalent approximation of the rate-outage probability expressions, we approximate the non-convex optimization problems as a unified geometric programming problem (GPP), for which we derive the closed-form solution. Illustrative results indicate that the proposed power allocation (PPA) offers significant gains in energy savings as compared to the equal-power allocation (EPA), and the simple closed-form GPP solution can provide closer performance to the exact method at lower values of rate-outage probability, for the three IMIMO systems.

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