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首页> 外文期刊>Chinese Journal of Electronics >A Joint Feedback Bit and Power Allocation Strategy for Multi-cell Systems over Composite Fading Channels
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A Joint Feedback Bit and Power Allocation Strategy for Multi-cell Systems over Composite Fading Channels

机译：复合衰落信道上多小区系统的联合反馈比特和功率分配策略

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This paper addresses the joint Feedback bit allocation (FBA) and Power allocation (PA) problem for a limited feedback coordinated multi-cell transmission system over composite fading channels. The Rayleigh/Lognormal fading channel is considered, and the effects of path loss and the macro-level correlation are also taken into account. A modified performance measure, referred to as the virtual sum rate is adopted to facilitate the analysis. The closed forms of the lower bound on virtual sum rate are derived over uncorrelated and correlated shadowed fading channels. Based on the lower bound, we then formulate an optimization problem of maximizing the virtual sum rate under constraints on the total number of feedback bits per MS and the total transmit power per BS. Considering the tight coupling between the FBA and the PA, we solve the optimization problem by solving an alternating sequence of FBA and PA subproblems using a coordinated ascent searching method. Numerical results show that the proposed strategy can converge in a few iterations and generally yield better performance than the conventional FBA schemes under composite fading channels.
机译：本文解决了复合衰落信道上有限反馈协调多小区传输系统的联合反馈比特分配（FBA）和功率分配（PA）问题。考虑了瑞利/对数正态衰落信道，并且还考虑了路径损耗和宏级别相关性的影响。修改后的性能指标被称为虚拟总和率，以方便分析。虚拟和率下限的封闭形式是在不相关和相关的阴影衰落信道上得出的。然后，基于下限，我们提出了一个优化问题，即在每个MS的反馈位数总数和每个BS的总发射功率的约束下，最大化虚拟求和速率。考虑到FBA和PA之间的紧密耦合，我们通过使用协调上升搜索方法解决FBA和PA子问题的交替序列来解决优化问题。数值结果表明，在复合衰落信道下，所提出的策略可以进行几次迭代收敛，并且与常规的FBA方案相比，性能通常更好。

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