CIF: Medium: Interference Alignment and the Rate-Reliability Tradeoff of Wireless Networks

现代社会越来越依赖无线网络。频谱是无线网络中最有价值的资源。如何在不同用户之间共享这一有限的资源是主要挑战之一。当不同的用户共享相同的频谱时，他们的信号会相互干扰。因此，无线网络最显著的特点就是干扰现象。在这项研究中，我们特别强调实际考虑，最终找到新的？现实？处理干扰的方法。最新的发展是干扰对齐的想法，它已经表明无线网络的容量可能比以前认为的要高得多。由于较高的费率总是以较低的可靠性为代价，新出现的产能结果只反映了一半的情况。这项研究的动机是需要通过评估干扰对齐方案在速率和可靠性都令人担忧的情况下对无线网络性能的好处来完成这一图景。这项研究遵循三个主要推动力。首先，我们从传统编码的角度研究了干扰对齐方案的速率-可靠性权衡，这强调了低的译码复杂度，通常是以有限的最优概念为代价的。其次，我们研究了香农框架中干扰对齐方案的速率-可靠性权衡，该框架允许最优性的强定义，通常以无限延迟和复杂性为代价。这两个推力是最终推力的垫脚石，以协调来自两个不同角度的发现，并使用集体见解来开发新的物理层方案，该方案可以在速率-可靠性权衡的前沿运行。

Modern society is increasingly relying on wireless networks. Spectrum is the most valuable resource in a wireless network. How to share this limited resource among different users is one of the main challenges. When different users share the same spectrum, their signals cause interference to each other. Therefore, the most distinctive feature of wireless networks is the phenomenon of interference. In this research, we place special emphasis on practical considerations to ultimately find new ? realistic ? methods to deal with interference.A recent development is the idea of interference alignment which has shown that the capacity of wireless networks may be significantly higher than previously believed. Since higher rates invariably come at the cost of lower reliability, the emerging capacity results present only half the picture. This research is motivated by the need to complete this picture by evaluating the benefits of interference alignment schemes on the performance of wireless networks when both rate and reliability are of concern. The research follows three main thrusts. First, we examine the rate-reliability tradeoff of interference alignment schemes from the traditional coding perspective which places emphasis on low decoding complexity, usually at the cost of a restricted notion of optimality. Second, we examine the rate-reliability tradeoff of interference alignment schemes in the Shannon framework which allows strong definitions of optimality, usually at the cost of unbounded delay and complexity. These two thrusts are the stepping stones to the final thrust to reconcile the findings from the two distinct perspectives and use the collective insights to develop new physical layer schemes that can operate at the frontier of the rate-reliability tradeoff.