Coordinated Beamforming for MISO Interference Channel: Complexity Analysis and Efficient Algorithms

Coordinated Beamforming for MISO Interference Channel: Complexity Analysis and Efficient Algorithms
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MISO 干扰通道的协调波束形成:复杂性分析和高效算法

DOI:
10.1109/tsp.2010.2092772
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发表时间:
2011-03
影响因子:
5.4
通讯作者:
Luo, Zhi-Quan
Luo, Zhi-Quan
中科院分区:
工程技术1区
文献类型:
--
作者:
Liu, Ya-Feng;Dai, Yu-Hong;Luo, Zhi-Quan

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在蜂窝无线系统中,位于小区边缘的用户经常遭受显著的小区外干扰。假设每个基站配备有多个天线,我们可以将这种情况建模为多输入单输出(MISO)干扰信道。在本文中,我们考虑一个协调的波束成形方法,多个基站联合优化其下行链路波束成形向量,以同时提高一个给定的一组小区边缘用户的数据速率。假设完美的信道知识,我们制定了这个问题的最大化的系统效用(平衡用户的公平性和平均用户速率),在每个基站的个人功率约束。我们表明,对于单载波的情况下,当每个基站的天线数至少为2时,最优协调波束成形问题是NP-难的谐波平均效用和比例公平效用。对于一般的公用事业,我们提出了一个循环坐标下降算法,它使每个发射机更新其波束形成器本地有限的信息交换,并建立其全局收敛到一个稳定点。以空间匹配波束形成器为基准,通过计算机仿真验证了该方法的有效性。
In a cellular wireless system, users located at cell edges often suffer significant out-of-cell interference. Assuming each base station is equipped with multiple antennas, we can model this scenario as a multiple-input single-output (MISO) interference channel. In this paper we consider a coordinated beamforming approach whereby multiple base stations jointly optimize their downlink beamforming vectors in order to simultaneously improve the data rates of a given group of cell edge users. Assuming perfect channel knowledge, we formulate this problem as the maximization of a system utility (which balances user fairness and average user rates), subject to individual power constraints at each base station. We show that, for the single-carrier case and when the number of antennas at each base station is at least two, the optimal coordinated beamforming problem is NP-hard for both the harmonic mean utility and the proportional fairness utility. For general utilities, we propose a cyclic coordinate descent algorithm, which enables each transmitter to update its beamformer locally with limited information exchange and establish its global convergence to a stationary point. We illustrate its effectiveness in computer simulations by using the space matched beamformer as the benchmark.
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