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Power control and resource allocation for capacity improvement in picocell downlinks

机译:功率控制和资源分配,以提高微微小区下行链路的容量

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In this paper we study the power control of multiuser orthogonal frequency division multiplexing (OFDM) transmissions in a heterogeneous network which features macro user equipments (MUEs) and pico user equipments (PUEs) sharing the same resource blocks (RBs) during downlink. We aim to maximize the sum capacity of PUEs while meeting the performance constraints of MUEs. Because of mutual interference caused by RB reuse, the transmission power of every RB is to be individually controlled, leading to a more complex problem of resource allocation and power control optimization. Our proposed approach is to first reformulate the original mixed integer programming problem into a convex power control problem by dropping the allocation variables. Secondly, we propose a fast and effective power control algorithm to solve the convex problem by exploiting the Karush-Kuhn-Tucker conditions of power control. Finally, we propose a suboptimal resource allocation scheme and present numerical results for performance evaluation.
机译:在本文中,我们研究了异构网络中多用户正交频分多路复用(OFDM)传输的功率控制,该网络具有宏用户设备(MUE)和微微用户设备(PUE)在下行链路期间共享相同的资源块(RB)。我们的目标是在满足MUE性能限制的同时,最大化PUE的总容量。由于RB复用造成的相互干扰,每个RB的发射功率要单独控制,导致资源分配和功率控制优化的问题更加复杂。我们提出的方法是通过删除分配变量,首先将原始的混合整数规划问题重构为凸功率控制问题。其次,我们提出了一种快速有效的功率控制算法,通过利用功率控制的Karush-Kuhn-Tucker条件来解决凸问题。最后,我们提出了一个次优的资源分配方案,并提出了用于性能评估的数值结果。

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