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首页> 外文期刊>IEEE Transactions on Vehicular Technology >A Unified Analysis of Spectral Efficiency for Two-Hop Relay Systems With Different Resource Configurations
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A Unified Analysis of Spectral Efficiency for Two-Hop Relay Systems With Different Resource Configurations

机译：资源配置不同的两跳中继系统频谱效率的统一分析

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摘要

In this paper, we analyze in a unified way the achievable rate and spectral efficiency of multicarrier and multiantenna two-hop relay systems with an interference-free linear transceiver. We consider two kinds of decode-and-forward (DF) relay systems with three nodes. In the first kind of relay systems where only the relay node employs the full channel state information (CSI) of both the source–relay (S–R) link (first hop) and the relay–destination (R–D) link (second hop), the relay eliminates the interference of these links. In the second kind of systems, where the source node employs the CSI of the first hop, the destination node employs the CSI of the second hop, whereas the relay node employs the full CSI of both the hops; these nodes can jointly eliminate the interference. For the multicarrier relay or multiantenna relay systems supporting different diversity and multiplexing gains and under the aforementioned assumptions for the CSI, we find that the achievable rate of each hop or its lower bound can be unified in the generalized mean of the eigenvalues of an equivalent channel correlation matrix. Furthermore, by using the properties of generalized mean and by resorting to the random matrix theory, we derive the asymptotic spectral efficiency of the multicarrier or multiantenna systems with different CSI assumptions. Finally, we provide simulation results to validate our analytical results. Our studies show that the multicarrier systems using code-division multiplexing (CDM) or the multiantenna systems can benefit more from exploiting the CSI at all the three nodes than the multicarrier systems using frequency-division multiplexing (FDM), particularly, in the case of a high load factor.
机译：在本文中，我们统一分析了具有无干扰线性收发器的多载波和多天线两跳中继系统的可实现速率和频谱效率。我们考虑具有三个节点的两种解码转发（DF）中继系统。在第一种中继系统中，只有中继节点使用源－中继（SR）链路（第一跳）和中继－目标（RD）链路（第二跳）的全信道状态信息（CSI）中继）消除了这些链路的干扰。在第二类系统中，源节点采用第一跳的CSI，目的节点采用第二跳的CSI，而中继节点采用两跳的完整CSI；这些节点可以共同消除干扰。对于支持不同分集和复用增益的多载波中继或多天线中继系统，并且在前面提到的CSI假设下，我们发现可以将每个跃点或其下限的可实现速率统一为等效信道特征值的广义均值相关矩阵。此外，通过使用广义均值的性质并借助随机矩阵理论，我们推导了具有不同CSI假设的多载波或多天线系统的渐近频谱效率。最后，我们提供仿真结果以验证我们的分析结果。我们的研究表明，与使用频分复用（FDM）的多载波系统相比，使用码分多路复用（CDM）的多载波系统或多天线系统可从所有三个节点上利用CSI受益更多。高负载率。

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