论文标题
有限的基于反馈的自适应功率分配和用于多样性的OFDM DF中继网络的子载波配对
Limited Feedback based Adaptive Power Allocation and Subcarrier Pairing for OFDM DF Relay Networks with Diversity
论文作者
论文摘要
基于反馈的动态资源分配算法是针对具有正交频分多路复用（OFDM）调制的继电器合作网络的。在本文中考虑了一个通信模型，其中一个源节点与一个由一个半双链解析（DF）继电器辅助的一个目标节点通信。我们首先考虑\ emph {pelective} df方案，其中某些中继子载体如果不有利地转发接收到的符号，将保持空闲。此外，我们考虑\ emph {增强} df方案，其中使用空闲子载波在源传输新消息。我们旨在通过基于劳埃德算法在每个子载波上共同优化功率分配和子载波配对来最大化系统瞬时速率。总和都考虑了总和限制。联合优化原来是一个混合的整数编程问题。然后，我们通过连续放松将其转换为凸优化，并在双重域中实现溶液。
A limited feedback based dynamic resource allocation algorithm is proposed for a relay cooperative network with Orthogonal Frequency Division Multiplexing (OFDM) modulation. A communication model where one source node communicates with one destination node assisted by one half-duplex Decode-and-Foward (DF) relay is considered in this paper. We first consider the \emph{selective} DF scheme, in which some relay subcarriers will keep idle if they are not advantageous to forward the received symbols. Furthermore, we consider the \emph{enhanced} DF scheme where the idle subcarriers are used to transmit new messages at the source. We aim to maximize the system instantaneous rate by jointly optimizing power allocation and subcarrier pairing on each subcarrier based on the Lloyd algorithm. Both sum and individual power constraints are considered. The joint optimization turns out to be a mixed integer programming problem. We then transform it into a convex optimization by continuous relaxation, and achieve the solution in the dual domain.
