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arXiv 1601.04724cs.ITcs.NImath.ITmath.OC
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使用SDP松弛的MIMO干扰信道中的干扰对齐

Interference Alignment in MIMO Interference Channels using SDP Relaxation

Siavash Mollaebrahim, Pouya Ghari, Mohammad Sadegh Fazel, Muhammad Ali Imran

摘要:

当今,提供更高的数据率是无线通信系统的重要目标。干扰是实现这一目标的重要障碍之一。干扰对齐是一种管理技术,其在每个接收器处的最小可能维度子空间中对齐来自其他发射器的干扰,并且因此为自由干扰信号提供剩余维度。不协调干扰是不能与来自协调部分的干扰协调地对准的干扰的示例,因此,干扰对准方法的性能降低。在本文中,我们提出了两个秩最小化方法,以提高性能的干扰对齐存在不协调的干扰源。首先选择了一个新的目标函数,然后针对不协调干扰提出了一类新的凸松弛算法,使得优化问题的最优值降低。此外,我们使用schatten-p-norm作为替代的秩函数,我们实现迭代重加权算法来解决优化问题。此外,我们将我们提出的方法,以减轻在中继辅助MIMO干扰信道的干扰,并提出了一种加权和的方法,以提高在放大和转发中继辅助MIMO系统的干扰对齐的性能的基础上的秩最小化方法。仿真结果表明,与其他干扰对齐方法相比,本文提出的方法可以获得更高的复用增益和和速率,提高了干扰对齐的性能。

英文摘要:

Nowadays, providing higher data rate is a momentous goal for wireless communications systems. Interference is one of the important obstacles to reach this purpose. Interference alignment is a management technique that align interference from other transmitters in the least possible dimension subspace at each receiver and as a result, provide the remaining dimensions for free interference signal. An uncoordinated interference is an example of interference which cannot be aligned coordinately with interference from coordinated part and consequently, the performance of interference alignment approaches is degraded. In this paper, we propose two rank minimization methods to enhance the performance of interference alignment in the presence of uncoordinated interference sources. Firstly, a new objective function is chosen then, a new class of convex relaxation is proposed with respect to the uncoordinated interference which leads to decrease the optimal value of our optimization problem. Moreover, we use schatten-p-norm as surrogate of rank function and we implement iteratively reweighted algorithm to solve optimization problem. In addition, we apply our proposed methods to mitigate interference in relay-aided MIMO interference channel, and propose a weighted-sum method to improve the performance of interference alignment in the amplify-and-forward relay-aided MIMO system based on the rank minimization approach. Finally, our simulation results show that our proposed methods can obtain considerably higher multiplexing gain and sum rate than other approaches in the interference alignment framework and the performance of interference alignment is improved.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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