EAGER: Optimal Power Allocation and Relay Selection with Spatial Diversity in Wireless Relay Networks

在无线网络中，通信系统的功耗最小化是至关重要的。这需要新的探索性方法，将编码、功率最小化和传输技术集成到系统设计中，超越当前的方法。协作通信环境下的无线中继网络为解决这一挑战提供了有利的平台。协作通信被认为是实现无线网络的少数物理层技术之一。通过在协作通信中采用中继进行联合功率和位置优化，可以大大提高潜在效益。本文的目标是研究一个NP困难的混合整数非线性规划（MINLP）在联合功率分配、中继定位问题的制定和解决，并扩展到编码。由于继电器与终端之间的距离更小，空间分集以及高效的信号处理方案（如分布式波束形成和分布式时空编码），可以实现更低的能耗。利用组合问题找到了几种继电保护结构下的近似最优解。研究了以下几种情况：1)仅bs架构，2)每MS单个中继，3)每MS多个中继，4)分布式波束形成，5)分布式空时编码。该项目还开发了无线通信的跨学科教育材料和课程，目的是通过新的跨学科课程弥合网络和无线通信课程之间的差距。本科生和研究生将参与项目的组成部分，适用于他们的兴趣和能力水平。

In wireless networks it is critical that power consumption by the communication system is minimized. This calls for new exploratory approaches which incorporate coding, power minimization, and transmission techniques integrated in a system design beyond the current methods. Wireless relay networks in the context of cooperative communications provide favorable platform to address this challenge. Cooperative communications is regarded as one of the few enabling physical layer technologies for wireless networking. By employing relays for joint power and location optimization in cooperative communications, the potential benefits are substantially enhanced. The goal of this proposal is to investigate a mixed-integer nonlinear program (MINLP) which is NP hard, in the formulation and solution of the problem of joint power allocation, relay location, and extended to coding. Lower energy consumption is achieved due to smaller distances between relays and the terminals, spatial diversity, and efficient signal processing schemes such as distributed beam-forming and distributed space time coding. The near optimal solution is found using the combinatorial problem under several relaying architectures. The following cases are investigated: 1) BS-only architecture, 2) single relay per MS, 3) multiple relays per MS, 4) distributed beam-forming, and 5) distributed space-time coding. This project also develops interdisciplinary educational material and courses on wireless communications with the goal of bridging the gap between networking and wireless communications curricula via new interdisciplinary courses. Undergraduate and graduate students will be involved with components of the project that are applicable to their level of interest and ability.