Joint Optimization of Generalized Multicarrier Waveforms and Power Allocation for Two-Way Relay Systems

双向中继系统的广义多载波波形和功率分配联合优化

• 批准号: 245945805
• 负责人: Professor Dr.-Ing. Volker Kühn
• 金额: --
• 依托单位: Fachbereich 01: Physik und Elektrotechnik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/245945805?language=en
• 关键词: Joint; Optimization; Generalized; Multicarrier; Waveforms

Modern communication systems have evolved from pure voice call systems to networks supporting an increasing number of services with different Quality of Service (QoS) requirements. This development comes at the expense of a growing demand for high data rates having severe impacts on the architecture of mobile communication systems. Relaying is seen as a key technology to improve future wireless communication systems in terms of coverage extension and system throughput. However, as the deployment of relay nodes also introduces impairments due to the half-duplex constraint, sophisticated cooperative communication approaches are essential. In order to support the message exchange between two nodes, the concept of two-way relaying raised enormous interest recently as it facilitates the simultaneous transmission of both directions in the same frequency band. Based on this initial transmission, the relay broadcasts a joint message to both nodes in a second phase using the principle of network coding. The main gains are due to the application of physical layer network coding and the corresponding detection schemes in the first phase. Another key technology for future wireless communication systems is multicarrier transmission with non-orthogonal waveforms known as Generalized Frequency Division Multiplexing (GFDM) or equivalently Filterbank Based MultiCarrier (FBMC). These waveforms are well localized in time and frequency domain and allow for flexible usage of the resources in both dimensions. The design of the waveforms improves robustness against transceiver mismatches and, as adequate synchronization of several distributed nodes is a challenging task, the adaption of these innovative non-orthogonal waveforms for two-way relaying systems is a very promising approach.The main goal of this project is the development of a joint impulse shaping and resource allocation strategy for a two-way relay system including physical layer network coding and GFDM. Aiming for an overall high spectral efficiency while facilitating robustness against imperfections in the transceiver design, innovative waveforms and advanced coding & modulation concepts including PLNC are strongly required. The design of innovative waveforms allows for an efficient usage of the time-frequency grid and takes synchronization aspects such as time-and-frequency offsets into account. Moreover, the envisaged flexible but non-orthogonal waveform design allows controlling the trade-off between inter-carrier/-symbol interference and assignment of carriers to provide the required data rate. To cope for channel variations or changing rate requirements a flexible adaptation of waveforms (dynamic spectrum shaping), e.g., by using codebook-based approaches has to be investigated. The flexible adaptation of transmit parameters can especially be exploited in the multiple access phase of the two-way relaying protocol leading to highly scalable detectors at the relay.

现代通信系统已经从纯语音呼叫系统发展到支持越来越多具有不同服务质量（QoS）要求的业务的网络。这种发展是以对高数据速率的日益增长的需求为代价的，这对移动通信系统的架构产生了严重的影响。中继被认为是提高未来无线通信系统的覆盖范围和系统吞吐量的关键技术。然而，由于中继节点的部署也引入了半双工约束的损害，复杂的协作通信方法是必不可少的。为了支持两个节点之间的消息交换，双向中继的概念最近引起了极大的兴趣，因为它有助于在同一频段内同时传输两个方向。在此初始传输的基础上，中继在第二阶段使用网络编码原理向两个节点广播联合消息。主要的增益是由于在第一阶段应用了物理层网络编码和相应的检测方案。未来无线通信系统的另一项关键技术是非正交波形的多载波传输，即广义频分复用（GFDM）或基于滤波器组的多载波（FBMC）。这些波形在时域和频域都很好地定位，并允许在两个维度上灵活地使用资源。波形的设计提高了对收发器失配的鲁棒性，并且由于多个分布式节点的充分同步是一项具有挑战性的任务，因此将这些创新的非正交波形用于双向中继系统是一种非常有前途的方法。本课题的主要目标是为包含物理层网络编码和GFDM的双向中继系统开发联合脉冲整形和资源分配策略。为了实现整体的高频谱效率，同时促进对收发器设计缺陷的鲁棒性，强烈需要创新的波形和先进的编码和调制概念，包括PLNC。创新波形的设计允许有效地使用时频网格，并考虑同步方面，如时间和频率偏移。此外，设想的灵活但非正交的波形设计允许控制载波间/符号干扰和载波分配之间的权衡，以提供所需的数据速率。为了应对信道变化或变化的速率要求，必须研究灵活的波形适应（动态频谱整形），例如，通过使用基于码本的方法。特别是在双向中继协议的多址阶段，可以利用传输参数的灵活适应，从而在中继上实现高度可扩展的检测器。